Patent Publication Number: US-11649090-B2

Title: Bag body provided with zipper tape, bag body, method for producing bag body, and device for producing bag body

Description:
TECHNICAL FIELD 
     The present invention relates to a zipper-tape bag, a bag body, a manufacturing method of a bag, and a manufacturing machine of a bag. 
     BACKGROUND ART 
     Zipper-tape bags re-sealable after once unsealing bag bodies that house contents have recently come to be widely used. Some of examples of the zipper-tape bags each include an unsealing tape for tearing the bag body to unseal the bag (see, for instance, Patent Literatures 1, 2). 
     The zipper-tape bags disclosed in Patent Literatures 1, 2 are each provided with a male member and a female member each including a belt-shaped base, a layered portion that is provided on one of the belt-shaped bases of the male member and the female member and is thinner than an adjacent portion, and an unsealing tape layered on the layered portion. A projection is provided on the other of the belt-shaped bases at an end near an opening of a bag body in a width direction, the projection having a height equal to or larger than the thickness of the layered portion and being bonded to an inner surface of the bag. The bags further each include a cut, which penetrates through the bag body and the one of the belt-shaped bases provided with the layered portion, to forma tab. 
     To unseal the bag, the tab is pinched to simultaneously cut off the unsealing tape and the layered portion from the belt-shaped base and tear the bag body. 
     CITATION LIST 
     Patent Literatures 
     Patent Literature 1 JP-5651850 B1 
     Patent Literature 2 JP-5651851 B1 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     After dedicated studies, the inventors have found an easily openable zipper-tape bag including a separation strip, a bag, a manufacturing method of a bag, and a manufacturing machine of a bag. 
     An object of the invention is to provide an easily openable zipper-tape bag including a separation strip, a bag, a manufacturing method of a bag, and a manufacturing machine of a bag. 
     Means for Solving the Problems 
     A method according to an aspect of the invention is for manufacturing a bag including: a bag body including a folded single film or at least two sheets of film layered on each other; a zipper tape attached to one of opposing inner surfaces of the bag body; and a longitudinal separation strip configured to form an opening in the bag body, in which the zipper tape includes a female member including a female belt-shaped base and a female portion provided on the female belt-shaped base, a male member including a male belt-shaped base and a male portion provided on the male belt-shaped base and engageable with the female portion, and an extension on one of the female belt-shaped base and the male belt-shaped base, the extension being defined, when the female portion and the male portion are engaged, by a part of a longer-width one of the female belt-shaped base and the male belt-shaped base lengthened toward an end in a width direction with respect to a shorter-width one of the female belt-shaped base and the male belt-shaped base, and the separation strip is interposed between the female belt-shaped base and the male belt-shaped base or between the longer-width one of the female belt-shaped base and the male belt-shaped base and the film on which the shorter-width one of the female belt-shaped base and the male belt-shaped base is attached, the separation strip being a longitudinal component configured to cut the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base to form the opening in the bag body, the separation strip being disposed at a position facing the extension, the method including: attaching the separation strip and the shorter-width one of the female belt-shaped base and the male belt-shaped base on the film separately or attaching the separation strip having been integrated with the shorter-width one of the female belt-shaped base and the male belt-shaped base on the film; attaching the longer-width one of the female belt-shaped base and the male belt-shaped base on the film attached with the separation strip and the shorter-width one of the female belt-shaped base and the male belt-shaped base in a manner capable for the female portion and the male portion to be engaged; and cutting the separation strip and the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base to form a tab without cutting the film facing a surface of the longer-width one of the female belt-shaped base and the male belt-shaped base opposite a surface provided with the female portion or the male portion of the longer-width one of the female belt-shaped base and the male belt-shaped base while a facing portion defined at a part of the longer-width one of the female belt-shaped base and the male belt-shaped base, which faces the separation strip, is not bonded with the separation strip. 
     It should be noted that the manufacturing method of the bag according to the above aspect of the invention is suitable as a manufacturing method of various bags including a bag produced by folding a single sheet of film, a bag produced by layering two sheets of film, and a gusset bag and a self-standing bag including two or more sheets of film to provide gussets at lateral sides thereof. 
     According to the above aspect of the invention, the facing portion, which is at the part of the longer-width one of the female belt-shaped base and the male belt-shaped base facing the separation strip, is not bonded to the separation strip. The tab, which is pinched when the film is torn to unseal the bag, is formed in the non-bonded region by cutting the separation strip and the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base without cutting the film facing the surface of the longer-width one of the female belt-shaped base and the male belt-shaped base opposite the surface provided with the female portion or the male portion. Accordingly, the tab can be formed by cutting the separation strip and the film attached with the separation strip. Since the separation strip and the facing portion are not bonded in the bag manufactured according to the manufacturing method of the above aspect of the invention, the separation strip can be easily separated from the facing portion when the tab is pinched to pull the separation strip, so that it is expected that the bag can be smoothly unsealed. 
     The tab may be suitably formed using any means (e.g. a laser device and a blade) capable of cutting the film. Incidentally, the cutting depth may be adjusted in forming the tab. The tab may be configured in any shape as long as the separation strip can be pinched by fingers. For instance, the tab may be C-shaped. 
     The shape of the separation strip is not limited as long as the bag body can be torn. For instance, the separation strip may be suitably a belt-shaped component or a string-shaped component. 
     The separation strip may be directly attached to the film. Alternatively, the separation strip may be integrated with a part of the belt-shaped base and the separation strip may be attached to the film through the part of the belt-shaped base. 
     Further, in the non-bonded state, the longer-width one of the female belt-shaped base and the male belt-shaped base is not necessarily separated from the separation strip but may be in contact with the separation strip as long as being not bonded. 
     In the above arrangement, a first convex portion thicker than a thickness of the shorter-width one of the female belt-shaped base and the male belt-shaped base may be provided to the shorter-width one of the female belt-shaped base and the male belt-shaped base at a side adjacent to the separation strip at the end in the width direction, and a second convex portion thicker than the longer-width one of the thickness of the female belt-shaped base and the male belt-shaped base may be provided to the longer-width one of the female belt-shaped base and the male belt-shaped base at a side adjacent to the separation strip at an end in the width direction. 
     In the above arrangement, the first convex portion and the second convex portion may be positioned at ends of the separation strip in the width direction. According to the above arrangement, when the bag body is torn to unseal the bag using the separation strip, the first convex portion and the second convex portion serve as guides for tearing the bag body, thereby preventing the bag body from being torn in an unintended direction. Further, the first convex portion and the second convex portion are located close to the opening edges of the bag body. According to the above arrangement, when the opening edges of the bag body are widely separated to disengage the male portion and the female portion, the first convex portion and the second convex portion serve as slip stoppers, thereby facilitating the opening process of the bag body. 
     A method according to another aspect of the invention is for manufacturing a bag including: a bag body including a folded single film or at least two sheets of film layered on each other; a zipper tape attached to one of opposing inner surfaces of the bag body; and a longitudinal separation strip configured to form an opening in the bag body, in which the zipper tape includes a male portion and a female portion that are engageable with each other, and a belt-shaped portion on which the male portion and the female portion are provided at different positions, the belt-shaped portion being folded to define a folded portion so that the male portion and the female portion are engageable, and the separation strip is a longitudinal component located between the female portion and the male portion on the belt-shaped portion of the zipper tape at a position near the female portion or the male portion with respect to the folded portion, the separation strip being configured to cut the film to form an opening in the bag body, the method including: attaching the zipper tape onto the film; and cutting the film attached with the zipper tape at a part corresponding to the separation strip of the zipper tape attached to the film to form a tab without cutting the film facing a surface of the folded belt-shaped portion opposite a surface facing the separation strip while a facing portion defined at a part of the folded belt-shaped portion facing the separation strip is not bonded with the separation strip. 
     According to the above aspect of the invention, the facing portion, which is the part of the folded belt-shaped portion facing the separation strip, is not bonded to the separation strip. Further, the tab, which is pinched when the film is torn by the separation strip to unseal the bag, is formed by cutting the film attached with the separation strip in the non-bonded region. Accordingly, the tab can be formed by cutting the film attached with the separation strip. Since the separation strip and the facing portion are not bonded in the bag manufactured according to the manufacturing method of the above aspect of the invention, the separation strip can be easily separated from the facing portion when the tab is pinched to pull the separation strip, so that it is expected that the bag can be smoothly unsealed. 
     The tab is formed by cutting the separation strip and the surface torn by the separation strip without cutting the surface of the bag facing the surface torn by the separation strip. The tab may be configured in any shape as long as the separation strip can be pinched by fingers. For instance, the tab may be C-shaped. 
     In the above aspect of the invention, the zipper tape may include a first convex portion and a second convex portion each having a thickness larger than a thickness of the belt-shaped portion, the first convex portion and the second convex portion being located on the belt-shaped portion near respective ends of the separation strip in the width direction. 
     In the above arrangement, the first convex portion and the second convex portion are positioned at ends of the separation strip in the width direction. According to the above arrangement, when the bag body is torn to unseal the bag using the separation strip, the first convex portion and the second convex portion serve as guides for tearing the bag body, thereby preventing the bag body from being torn in an unintended direction. Further, the first convex portion and the second convex portion are located close to the opening edges of the bag body. According to the above arrangement, when the opening edges of the bag body are widely separated to disengage the male portion and the female portion, the first convex portion and the second convex portion serve as slip stoppers, thereby facilitating the unsealing process of the bag body. 
     In the above arrangement, a clearance may be provided between the separation strip and the first convex portion and between the separation strip and the second convex portion. 
     According to the above arrangement, since the clearance is provided between the separation strip and the first convex portion and between the separation strip and the second convex portion, when, for instance, the zipper tape is fused to the film and molten resin spreads sideways, the clearance prevents the separation strip from being integrated with the female member and the male member. Thus, the separation strip can be easily separated from the bag body, so that the bag body can be easily cut by the separation strip. 
     In the above aspect of the invention, the separation strip may be attached to the film in a form of a component independent of the zipper tape. 
     According to the above arrangement, when the separation strip is attached to the film separately from the zipper tape or the separation strip having been integrated with the zipper tape is attached to the film after being separated from the zipper tape, the bag body is torn to unseal the bag only with a force for tearing the bag body without the necessity of a force for separating the separation strip from the zipper tape, so that a large load is not applied in unsealing the bag. In particular, when the separation strip having been integrated with the zipper tape is separated from the zipper tape immediately before being attached to the film, even if a tension causing different degree of stretch is applied during the production process, the female member, the male member and the separation strip can be appropriately positioned and attached at predetermined positions before being stretched. Thus, the female member, the male member and the separation strip are kept from being stretched at different rates, so that the female member, the male member and the separation strip can be attached to the film without being wrinkled or the like, thereby preventing deterioration in the yield rate and achieving favorable production. 
     Herein, in attaching the separation strip having been integrated with the zipper tape to the film after being separated from the zipper tape, the separation strip may be attached to the film at the same time as being separated from the zipper tape. Further, when the separation strip is separated, the separation strip is not necessarily cut. The separation of the separation strip may be exemplarily achieved not by cutting, but by providing a perforated portion in a form of a dashed cut line like a perforation or a thin portion thinner than the other parts between the shorter-width one of the male belt-shaped base and the female belt-shaped base and the separation strip and tearing the zipper tape at the perforated portion or the thin portion, or by an interfacial separation at a boundary between the male/female belt-shaped base and the tearing guide piece. 
     A method according to still another aspect of the invention is for manufacturing a bag including a bag body including a folded single film or at least two sheets of film layered on each other, and a tape bonded to one of inner surfaces of the bag body, in which the tape includes at least one elongated base, a longitudinal separation strip bonded to the base along a longitudinal direction of the base and configured to tear the base and the film, and at least one protrusion located on a surface of a part of the base at which the separation strip is not bonded, the protrusion protruding in a direction normal to the base in which the separation strip is protruded, the method including: attaching the base to the film defining the one of inner surfaces of the bag body separately from the separation strip or with the separation strip having been integrated with the base; and cutting the tape and the film attached with the base to form a tab without cutting the film facing the film attached with the base while the tape is not bonded to a facing portion defined at a part of the film facing the film attached with the base and facing the tape. 
     According to the above aspect of the invention, the facing portion, which is defined at the part of the film facing the tape, is not bonded to the tape. The tab, which is pinched when the film is torn by the separation strip to unseal the bag, is formed by cutting the film attached with the base and the tape without cutting the film facing the film attached with the base in the non-bonded region. Thus, the tab can be formed by cutting the tape and the film attached with the base. Since the tape and the facing portion are not bonded in the bag manufactured according to the manufacturing method of the above aspect of the invention, the separation strip can be easily separated from the facing portion when the tab is pinched to pull the separation strip, so that it is expected that the bag can be smoothly unsealed. 
     The tab may be suitably formed using any means (e.g. a laser device and a blade) capable of cutting the film, as in the above-described manufacturing method of the zipper-tape bag. 
     The separation strip, which has been provided on the base in advance, is provided on the film. The separation strip is not necessarily heat-sealed, but various methods such as welding by ultrasonic waves and bonding using an adhesive or the like are applicable in order to attach the separation strip. 
     When the tape is not bonded to the film, the tape is not necessarily separated from the film facing the film bonded with the base, but the tape may be in contact with the film as long as the tape is not bonded to the facing film. 
     The shape of the separation strip is not limited as long as the film and the base can be torn. For instance, the separation strip may be suitably a belt-shaped component or a string-shaped component. 
     In the above arrangement, the formation of the tab may include forming a non-bonded region at which the separation strip and/or the tape is not bonded to the facing portion. 
     According to the above arrangement, in order to form the non-bonded region in which the separation strip and/or the tape is not bonded to the facing portion, the separation strip and/or the tape and the facing portion around the non-bonded region are bonded using a bonding unit such as a seal bar. In the non-bonded region, the separation strip and/or the tape and the facing portion are not subjected to bonding using the seal bar or the like (i.e. not bonded). 
     According to the above arrangement, non-bonded region can be expected to be easily formed by not using the bonding unit such as the seal bar. Thus, the non-bonded region can be reliably formed, so that the bag can be easily unsealed using the separation strip. 
     A zipper-tape bag according to a further aspect of the invention includes: a bag body including a folded single film or at least two sheets of film layered on each other; a zipper tape attached to one of opposing inner surfaces of the bag body; and a longitudinal separation strip configured to form an opening in the bag body, in which the zipper tape includes: a female member including a female belt-shaped base and a female portion provided on the female belt-shaped base; a male member including a male belt-shaped base and a male portion provided on the male belt-shaped base and engageable with the female portion; and an extension on one of the female belt-shaped base and the male belt-shaped base, the extension being defined by a lengthened part of a longer-width one of the female belt-shaped base and the male belt-shaped base relative to a shorter-width one of the female belt-shaped base and the male belt-shaped base toward an end in the width direction with the female portion and the male portion being engaged, the separation strip is interposed between the female belt-shaped base and the male belt-shaped base or between the longer-width one of the female belt-shaped base and the male belt-shaped base and the film on which the shorter-width one of the female belt-shaped base and the male belt-shaped base is attached, the separation strip being a longitudinal component configured to cut the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base to form the opening in the bag body, the separation strip being disposed at a position facing the extension, the separation strip and the shorter-width one of the female belt-shaped base and the male belt-shaped base are separately attached on the film or the separation strip having been integrated with the shorter-width one of the female belt-shaped base and the male belt-shaped base is attached on the film, the longer-width one of the female belt-shaped base and the male belt-shaped base is attached on the film attached with the separation strip and the shorter-width one of the female belt-shaped base and the male belt-shaped base in a manner capable for the female portion and the male portion to be engaged, the film facing a surface of the longer-width one of the female belt-shaped base and the male belt-shaped base opposite a surface on which the female portion or the male portion is provided is not cut, the zipper-tape bag further includes a tab formed by cutting the separation strip and the film on which the shorter-width one of the female belt-shaped base and the male belt-shaped base is attached, and the longer-width one of the female belt-shaped base and the male belt-shaped base is not bonded to the film facing the surface of the longer-width one of the female belt-shaped base and the male belt-shaped base opposite the surface on which the female portion or the male portion is provided. 
     According to the above aspect of the invention, the separation strip is not bonded to the longer-width one of the female belt-shaped base and the male belt-shaped base. The tab to be pinched when the film is torn by the separation strip to unseal the bag is provided in the non-bonded region. 
     Accordingly, the tab can be easily formed by a simply cutting the film attached with the longer-width one of the female member and the male member, thereby improving the productivity. 
     It should be noted that the bag body of the zipper-tape bag of the above aspect may include a grip at an end opposite the part containing the content across a part provided with the male member and/or the female member. 
     According to the above arrangement, the grip for holding the bag body allows the zipper-tape bag containing a heavy content to be held without the fear of dropping the zipper-tape bag. 
     In the above arrangement, a first convex portion thicker than a thickness of the shorter-width one of the female belt-shaped base and the male belt-shaped base may be provided to the shorter-width one of the female belt-shaped base and the male belt-shaped base at a side adjacent to the separation strip at an end in the width direction, and a second convex portion thicker than the thickness of the longer-width one of the female belt-shaped base and the male belt-shaped base may be provided to the longer-width one of the female belt-shaped base and the male belt-shaped base at a side adjacent to the separation strip at an end in the width direction. 
     In the above arrangement, the first convex portion and the second convex portion may be positioned at ends of the separation strip in the width direction. According to the above arrangement, when the bag body is torn to unseal the bag using the separation strip, the first convex portion and the second convex portion serve as guides for tearing the bag body, thereby preventing the bag body from being torn in an unintended direction. Further, the first convex portion and the second convex portion are located close to the opening edges of the bag body. According to the above arrangement, when the opening edges of the bag body are widely separated to disengage the male portion and the female portion, the first convex portion and the second convex portion serve as slip stoppers, thereby facilitating the unsealing process of the bag body. 
     A zipper-tape bag according to still further aspect of the invention includes: a bag body including a folded single film or at least two films layered on each other; a zipper tape attached to one of opposing inner surfaces of the bag body; and a longitudinal separation strip configured to form an opening in the bag body, in which the zipper tape includes a male portion and a female portion that are engageable with each other, and a belt-shaped portion on which the male portion and the female portion are provided at different positions, the belt-shaped portion being folded to define a folded portion so that the male portion and the female portion are engageable, the separation strip is a longitudinal component located between the female portion and the male portion on the belt-shaped portion of the zipper tape, the separation strip being configured to cut the film to form the opening in the bag body, the zipper-tape bag further includes a tab formed by cutting the separation strip and the film attached with the zipper tape at a part corresponding to the separation strip of the zipper tape attached to the film without cutting the film facing a surface of the folded belt-shaped portion opposite a surface facing the separation strip while the folded belt-shaped portion is not bonded with the separation strip, and the surface of the belt-shaped portion opposite the surface facing the separation strip is not bonded to the film facing the surface. 
     According to the above aspect of the invention, the separation strip is not bonded to the folded belt-shaped portion of the zipper tape facing the separation strip. Further, the tab to be pinched when the film is torn by the separation strip to unseal the bag is formed by cutting the film attached with the separation strip in the non-bonded region. Accordingly, the tab can be formed by cutting the film attached with the separation strip. 
     In the above arrangement, the zipper tape may include a first convex portion and a second convex portion each having a thickness larger than a thickness of the belt-shaped portion, the first convex portion and the second convex portion being located on the belt-shaped portion near respective ends of the separation strip in the width direction. 
     In the above arrangement, the first convex portion and the second convex portion are positioned at ends of the separation strip in the width direction. According to the above arrangement, when the bag body is torn to unseal the bag using the separation strip, the first convex portion and the second convex portion serve as guides for tearing the bag body, thereby preventing the bag body from being torn in an unintended direction. Further, the first convex portion and the second convex portion are located close to the opening edges of the bag body. According to the above arrangement, when the opening edges of the bag body are widely separated to disengage the male portion and the female portion, the first convex portion and the second convex portion serve as slip stoppers, thereby facilitating the unsealing process of the bag body. 
     In the above arrangement, a clearance may be provided between the separation strip and the first convex portion and between the separation strip and the second convex portion. 
     According to the above arrangement, since the clearance is provided between the separation strip and the first convex portion and between the separation strip and the second convex portion, when, for instance, the zipper tape is fused to the film and molten resin spreads sideways, the clearance prevents the separation strip from being integrated with the female member and the male member. Thus, the separation strip can be easily separated from the bag body, so that the bag body can be easily cut by the separation strip. 
     In the above arrangement, the separation strip may be attached to the film in a form of a component independent of the zipper tape. 
     According to the above arrangement, since the separation strip has been separated in advance from the zipper tape before the separation strip tears the bag body to unseal the bag, no force for separating the separation strip from the zipper tape is necessary but only a force for tearing the bag body is necessary in order to unseal the bag, so that a large load is not applied in unsealing the bag. In particular, when the separation strip is integrated with the zipper tape and the separation strip is separated from the zipper tape immediately before being attached to the film, even if a tension causing different degree of stretch is applied during the production process, the female member, the male member and the separation strip can be appropriately positioned and attached at predetermined positions before being stretched. Thus, the female member, the male member and the separation strip are kept from being stretched at different rates, so that the female member, the male member and the separation strip can be attached to the film without being wrinkled or the like, thereby preventing deterioration in the yield rate and achieving favorable production. 
     A bag according to still further aspect of the invention includes: a bag body including a folded single film or at least two sheets of film layered on each other; and a tape bonded to one of inner surfaces of the bag body, in which the tape includes at least one elongated base; a longitudinal separation strip bonded to the base along a longitudinal direction of the base and configured to tear the base and the film; and at least one protrusion located on a surface of a part of the base at which the separation strip is not bonded, the protrusion protruding in a direction normal to the base in which the separation strip is protruded, the base is attached to the film defining the one of inner surfaces of the bag body separately from the separation strip or with the separation strip having been integrated with the base, and the bag further includes a tab formed by cutting the tape and the film attached with the base without cutting the film facing the film attached with the base while the tape is not bonded to the film facing the film attached with the base. 
     According to the above aspect of the invention, the tape is not bonded to the film facing the film bonded with the base. The tab to be pinched when the base and the film are torn by the separation strip to unseal the bag is provided in the non-bonded region. 
     Accordingly, the bag capable of easily forming the tab can be provided by simply piercing the film attached with the tape. 
     A manufacturing machine according to still further aspect of the invention is for manufacturing a bag including: a bag body including a folded single film or at least two films layered on each other; a zipper tape attached to one of opposing inner surfaces of the bag body; and a longitudinal separation strip configured to form an opening in the bag body, in which the zipper tape includes: a female member including a female belt-shaped base and a female portion provided on the female belt-shaped base; a male member including a male belt-shaped base and a male portion provided on the male belt-shaped base and engageable with the female portion; and an extension on one of the female belt-shaped base and the male belt-shaped base, the extension being defined by a lengthened part of a longer-width one of the female belt-shaped base and the male belt-shaped base relative to a shorter-width one of the female belt-shaped base and the male belt-shaped base toward an end in the width direction with the female portion and the male portion being engaged, and the separation strip is interposed between the female belt-shaped base and the male belt-shaped base or between the longer-width one of the female belt-shaped base and the male belt-shaped base and the film on which the shorter-width one of the female belt-shaped base and the male belt-shaped base is attached, the separation strip being a longitudinal component configured to cut the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base to form the opening in the bag body, the separation strip being disposed at a position facing the extension, the manufacturing machine including: a mechanism configured to attach the separation strip and the shorter-width one of the female belt-shaped base and the male belt-shaped base on the film separately or with the separation strip being integrated in advance with the shorter-width one of the female belt-shaped base and the male belt-shaped base; a mechanism configured to attach the longer-width one of the female belt-shaped base and the male belt-shaped base on the film attached with the separation strip and the shorter-width one of the female belt-shaped base and the male belt-shaped base in a manner capable for the female portion and the male portion to be engaged; and a mechanism configured to cut the separation strip and the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base to form a tab without cutting the film facing a surface of the longer-width one of the female belt-shaped base and the male belt-shaped base opposite a surface provided with the female portion or the male portion of the longer-width one of the female belt-shaped base and the male belt-shaped base while a facing portion defined at a part of the longer-width one of the female belt-shaped base and the male belt-shaped base, which faces the separation strip, is not bonded with the separation strip. 
     According to the above aspect of the invention, the facing portion, which is defined at the part of the longer-width one of the female belt-shaped base and the male belt-shaped base, and faces the separation strip, is not bonded to the separation strip by the mechanism for forming the tab. The tab to be pinched when the film is torn to unseal the bag using the separation strip is formed in the non-bonded region by cutting the separation strip and the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base without cutting the film facing the surface of the longer-width one of the female belt-shaped base and the male belt-shaped base opposite the surface provided with the female portion or the male portion. Accordingly, the tab can be formed by cutting the separation strip and the film attached with the separation strip. Since the separation strip and the facing portion are not bonded in the bag manufactured using the manufacturing machine of the above aspect of the invention, the separation strip can be easily separated from the facing portion when the tab is pinched to pull the separation strip, so that it is expected that the bag can be smoothly unsealed. 
     A manufacturing machine according to still further aspect of the invention is for manufacturing a bag including: a bag body including a folded single film or at least two films layered on each other; a zipper tape attached to one of opposing inner surfaces of the bag body; and a longitudinal separation strip for forming an opening in the bag body, in which the zipper tape includes a male portion and a female portion that are engageable with each other, and a belt-shaped portion on which the male portion and the female portion are provided at different positions, the belt-shaped portion being folded to define a folded portion so that the male portion and the female portion are engageable, and the separation strip is a longitudinal component located between the female portion and the male portion on the belt-shaped portion of the zipper tape at a position near the female portion or the male portion with respect to the folded portion, the separation strip being configured to cut the film to form the opening in the bag body, the manufacturing machine including: a mechanism configured to attach the zipper tape to the film; and a mechanism configured to cut the film attached with the zipper tape at a part corresponding to the separation strip of the zipper tape attached to the film to form a tab without cutting the film facing a surface of the folded belt-shaped portion opposite a surface facing the separation strip while a facing portion defined at a part of the folded belt-shaped portion facing the separation strip is not bonded with the separation strip. 
     According to the above aspect of the invention, the facing portion, which is defined at the part of the folded belt-shaped portion facing the separation strip, is not bonded to the separation strip by the mechanism for forming the tab. Further, the tab to be pinched when the film is torn by the separation strip to unseal the bag is formed by cutting the film attached with the separation strip in the non-bonded region. Accordingly, the tab can be formed by cutting the film attached with the separation strip. Since the separation strip and the facing portion are not bonded in the bag manufactured using the manufacturing machine of the above aspect of the invention, the separation strip can be easily separated from the facing portion when the tab is pinched to pull the separation strip, so that it is expected that the bag can be smoothly unsealed. 
     A manufacturing machine according to still further aspect of the invention is for manufacturing a bag including: a bag body including a folded single film or at least two sheets of film layered on each other; and a tape bonded to one of inner surfaces of the bag body, in which the tape includes: at least one elongated base; a longitudinal separation strip bonded to the base along a longitudinal direction of the base and configured to tear the base and the film; and at least one protrusion located on a surface of a part of the base at which the separation strip is not bonded, the protrusion protruding in a direction normal to the base in which the separation strip is protruded, the manufacturing machine including: a mechanism configured to attach the base to the film defining the one of inner surfaces of the bag body separately from the separation strip or with the separation strip having been integrated with the base; and a mechanism configured to cut the tape and the film attached with the base to form a tab without cutting the film facing the film attached with the base while the tape is not bonded to a facing portion defined at a part of the film facing the film attached with the base and facing the tape. 
     According to the above aspect of the invention, the mechanism for forming the tab allows the tape not to be bonded with the part of the film facing the film bonded with the base. Further, the tab, which is to be pinched when the base and the film are torn by the separation strip to unseal the bag, is formed without cutting the part of the film facing the film attached with the base in the non-bonded region. Thus, the manufacturing machine capable of easily forming the tab by cutting the film bonded with the base, the base and the separation strip can be provided. 
     In addition, since the separation strip and the not-to-be-torn film facing the film to be torn are not bonded in the bag manufactured using the manufacturing machine of the above aspect of the invention, the separation strip can be kept from being bonded to the not-to-be-torn film when the tab is pinched to pull the separation strip, so that it is expected that the bag can be smoothly unsealed. 
     In the above aspect of the invention, the mechanism configured to form the tab may include a mechanism configured to form a non-bonded region at which the separation strip and/or the tape is not bonded to the facing portion. 
     According to the above arrangement, in order to form the non-bonded region in which the separation strip and/or the tape is not bonded to the facing portion, the part around the non-bonded region is bonded using a bonding unit such as a seal bar. In the above arrangement, the non-bonded region is not subjected to the bonding process using the seal bar or the like. 
     According to the above arrangement, the non-bonded region can be expected to be easily formed by not using the bonding unit such as the seal bar. Thus, the non-bonded region can be reliably formed, so that the bag can be easily unsealed using the separation strip. 
     In the above aspect of the invention, the mechanism configured to form the tab may include a blade and a movement restrictor configured to restrict a movement of the blade. 
     According to the above arrangement, the movement restrictor can adjust the displacement of the blade to achieve a so-called half-cut where the film bonded with the separation strip is cut without cutting the film not bonded with the zipper tape. Accordingly, the half-cut can be easily achieved irrespective of the thickness and/or material of the film and the zipper tape. 
     The movement restrictor may exemplarily be a device using an elastic force of an elastic component (e.g. a rubber, foamed resin and spring), a device configured to read a value of a pressure applied to the blade by a driver and stop applying the pressure on the blade when the pressure reaches a predetermined level, or a spacer configured to restrict the displacement of the blade. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a front elevational view showing a zipper-tape bag according to a first exemplary embodiment of the invention. 
         FIG.  2    is a cross sectional view of a relevant part of the zipper-tape bag. 
         FIG.  3 A  is a perspective view of a part of the zipper-tape bag. 
         FIG.  3 B  is a perspective view showing a relevant part of an opening trigger. 
         FIG.  4    is a front elevational view showing the zipper-tape bag. 
         FIG.  5    is a rear elevational view showing the zipper-tape bag. 
         FIG.  6    schematically shows a structure of a manufacturing machine for manufacturing the zipper-tape bag. 
         FIG.  7    is a perspective view showing a shaping unit of the manufacturing machine. 
         FIG.  8 A  is a cross sectional view of a relevant part before being machined, for illustrating formation of an opening trigger using the shaping unit. 
         FIG.  8 B  is a cross sectional view of a relevant part being machined, for illustrating formation of the opening trigger using the shaping unit. 
         FIG.  9    is a cross sectional view showing the zipper-tape bag containing a content and having been unsealed using a tearing guide piece. 
         FIG.  10 A  is a cross sectional view of a relevant part of a tape for showing a manufacturing process of a zipper-tape bag according to a second exemplary embodiment of the invention. 
         FIG.  10 B  is another cross sectional view of the relevant part of the zipper-tape bag for showing the manufacturing process of the zipper-tape bag according to the second exemplary embodiment of the invention. 
         FIG.  11    is a front elevational view showing a bag according to a third exemplary embodiment of the invention. 
         FIG.  12    is a front elevational view showing a relevant part of an opening trigger of the bag in an enlarged manner. 
         FIG.  13 A  is a cross sectional view taken along A-A line and viewed in a direction indicated by arrows in  FIG.  12   . 
         FIG.  13 B  is a cross sectional view taken along B-B line and viewed in a direction indicated by arrows in  FIG.  12   . 
         FIG.  14    schematically shows a structure of a manufacturing machine of the bag according to the third exemplary embodiment of the invention. 
         FIG.  15    is a cross sectional view showing the shaping unit being operated. 
         FIG.  16    is a cross sectional view of a relevant part of a tape according to another exemplary embodiment of the invention. 
         FIG.  17 A  is a cross sectional view of a relevant part of a tape showing a manufacturing process of a zipper-tape bag according to still another exemplary embodiment of the invention. 
         FIG.  17 B  is a cross sectional view of a relevant part of the zipper-tape bag showing the manufacturing process of the zipper-tape bag according to the still another exemplary embodiment of the invention. 
         FIG.  18    is a cross sectional view of a relevant part of a zipper-tape bag according to a further exemplary embodiment of the invention. 
         FIG.  19    is a cross sectional view of a relevant part of a zipper-tape bag according to a still further exemplary embodiment of the invention. 
         FIG.  20 A  is a cross sectional view of a relevant part of a tape showing a manufacturing process of a zipper-tape bag according to a still further exemplary embodiment of the invention. 
         FIG.  20 B  is a cross sectional view of a relevant part of the zipper-tape bag showing the manufacturing process of the zipper-tape bag according to the still further exemplary embodiment of the invention. 
         FIG.  21    is a cross sectional view of a relevant part of a bag according to a still further exemplary embodiment of the invention. 
     
    
    
     DESCRIPTION OF EMBODIMENT(S) 
     An exemplary embodiment of the invention will be described below with reference to the attached drawings. 
     In the description of the exemplary embodiments, common reference numerals will be given to the same components to simplify or omit their explanations. It should be understood that the scope of the zipper tape and the zipper-tape bag of the invention is by no means limited by the disclosure in the exemplary embodiments below. 
     First Exemplary Embodiment 
       FIGS.  1  to  3 B  show a zipper-tape bag according to a first exemplary embodiment. 
     Though a zipper tape bag in the first exemplary embodiment is exemplarily provided in a form of a bag for packaging various articles including food, medicine, medical products, stationeries, and miscellaneous goods, the use of the zipper bag is not limited to packaging these examples of the articles. 
     Structure of Zipper-Tape Bag 
       FIG.  1    shows a front elevation of a zipper-tape bag  1 . 
     As shown in  FIG.  1   , the zipper-tape bag  1  includes: a bag body  10  having a rectangular profile in a plan view and configured to receive a content; a zipper tape  20  that is bonded (e.g. heat-sealed) to an inner surface of the bag body  10 ; and a tearing guide piece  30  (separation strip). A tape  2  in the first exemplary embodiment includes the zipper tape  20  and the tearing guide piece  30 . 
     Structure of Bag Body 
     The bag body  10  includes: layered films  11 A,  11 B (only the film  11 A is shown in  FIG.  1   ); and a pair of opposing lateral portions  10 A provided at both ends of the layered films  11 A,  11 B, the lateral portions  10 A each being in a form of a gusset interfolded along a bend line. Further, the bag body  10  includes a bottom portion  10 B at a bottom part of the layered films interfolded along a bend line. 
     The bag body  10  includes pairs of side seals  12  at layered portions of the films  11 A,  11 B and the lateral portions  10 A. A bottom seal is formed at a bottom end of the bag body  10  at which the films  11 A,  11 B are layered on the bottom portion  10 B. A top seal  14  is formed at an end of the layered films  11 A,  11 B orthogonal to the side seals  12  and opposite the bottom seal  13 . 
     Further, the bag body  10  includes a partition seal  15  near one of the side seals  12  (left one of the side seals  12  in  FIG.  1   ). The partition seal  15 , the side seals  12  and the top seal  14  define a non-bonded region  16  thereinside. 
     Further, a housing space  10 C, in which a content P (see  FIG.  9   ) is to be received, is defined in the bag body  10  by the side seals  12 , the bottom seal  13 , the top seal  14 , and the partition seal  15 . 
     The zipper tape  20  and the tearing guide piece  30  are attached to one of the films (the film  11 A) of the bag body  10 . 
     Flattened point seals  120  are formed at both longitudinal ends of the zipper tape and the tearing guide piece  30  overlapped with the side seals  12  of the bag body  10 . 
     Two grips  14 A defined by holes are formed in the top seal  14 . 
     The grips  14 A are holes that are oblong in a plan view and formed in the films  11 A,  11 B. 
     It should be noted that the shape of the holes are not necessarily oblong in a plan view but may alternatively be circular, rectangular, triangular or the like in a plan view. Further, the number of the holes is not limited but at least one is necessary to comfortably hold the bag. Further, the grip  14 A may be provided in various forms. For instance, a separate string member may be attached in order to hold the bag. It should also be noted that the grip is not necessarily provided. 
     The films  11 A,  11 B may be single-layered or multi-layered films formed of, for instance, a thermoplastic resin such as (linear) low-density polyethylene (LLDPE), and polypropylene (PP). Examples of a surface base material usable for the multi-layered films include a biaxially-oriented polypropylene (Oriented Polypropylene: OPP), biaxially-oriented polyethylene terephthalate (OPET), biaxially-oriented nylon (ONy), and cast polypropylene (CPP). The multi-layered film may include an inorganic layer formed by depositing aluminum, laminating an aluminum foil, and the like in order to block light and permeation of gas (gas barrier). 
     Though any material for packaging bag is usable for the films  11 A,  11 B, it is preferable that the thickness of the films  11 A,  11 B is 10 μm or more and 200 μm or less. When the thickness is less than 10 μm, sealing strength and bag strength may sometimes be lowered. In contrast, the thickness exceeding 200 μm may sometimes make it difficult to unseal the bag. 
     Structure of Zipper Tape 
       FIG.  2    shows a cross sectional view of a relevant part of the zipper tape  20 . 
     As shown in  FIGS.  1  and  2   , the zipper tape  20  includes a male member  21  and a female member  22  that are configured to be engaged with and disengaged from each other. 
     The male member  21  and the female member  22  are both bonded to an inner surface of the film  11 A through a suitable process such as heat-sealing and adhesion. 
     The male member  21  includes a male belt-shaped base  21 A having a short width (dimension in an up-down direction in  FIG.  2   ) and a male portion  21 B formed continuously with the male belt-shaped base  21 A. The male portion  21 B is formed along a longitudinal direction of the male belt-shaped base  21 A (i.e. in a direction penetrating through  FIG.  2   ). 
     The female member  22  includes a female belt-shaped base  22 A having a long width, and a female portion  22 B projecting from the female belt-shaped base  22 A and configured to be engaged with or disengaged from the male portion  21 B. The female portion  22 B is formed along a longitudinal direction of the female belt-shaped base  22 A (i.e. in a direction penetrating through  FIG.  2   ). 
     Herein, the short width of the male belt-shaped base  21 A means that, when the male portion  21 B and the female portion  22 B are engaged, a length from the male portion  21 B to an end of the male belt-shaped base  21 A in a width direction near the top seal  14  of the bag body  10  is shorter than a length from the female portion  22 B to an end of the female belt-shaped base  22 A near the top seal  14  of the bag body  10  in the width direction. 
     In contrast, the female belt-shaped base  22 A having a long width has an extension  22 D having an elongated length in the width direction. 
     A surface of the extension of the female belt-shaped base  22 A on which the female portion  22 B is provided is a bonding surface bonded with the film  11 A on which the male belt-shaped base  21 A is bonded. 
     A surface of the female belt-shaped base  22 A opposite the surface from which the female portion  22 B projects is not bonded to the film  11 B. 
     The zipper tape  20  is made of, for instance, a polyolefin resin. It should be noted that the zipper tape  20  may have a shape retention property (i.e. adapted to keep the shape thereof when being bent in a longitudinal direction). 
     The polyolefin resin is preferably a polyethylene resin such as a low-density polyethylene or a linear low-density polyethylene, and a polypropylene resin. Examples of the usable polypropylene resin include homo-polypropylene (H-PP), block polypropylene (B-PP), random polypropylene (RPP), and propylene-ethylene-butene-1-random ternary copolymer. 
     Structure of Tearing Guide Piece 
     The tearing guide piece  30  is positioned between the film  11 A, to which the short-width male belt-shaped base  21 A is bonded, and the long-width female belt-shaped base  22 A and bonded to the film  11 A in parallel to the male belt-shaped base  21 A. 
     In the non-bonded region  16 , a surface of the tearing guide piece  30  opposite the surface attached to the film  11 A faces the female belt-shaped base  22 A. A facing portion, which is defined at the part of the female belt-shaped base  22 A facing the tearing guide piece  30 , is not bonded with the tearing guide piece  30  (non-bonded state). The non-bonded state means not only that the female belt-shaped base  22 A and the tearing guide piece  30  are spaced apart from each other, but also that the female belt-shaped base  22 A and the tearing guide piece  30  are in contact with each other but are not bonded. 
     The tearing guide piece  30  is formed by separating (e.g. cutting) a zipper tape member  2 A (see  FIG.  6   ) in parallel to the longitudinal direction into the short-width male belt-shaped base  21 A and a part having been separably integrated with an end of the short-width male belt-shaped base  21 A in the width direction. 
     Such separation may be achieved in any way other than the cutting, such as by providing a perforated portion in a form of a dashed cut line like a perforation or a thin portion thinner than the other parts between the male belt-shaped base  21 A and the tearing guide piece  30  and cutting the zipper tape member  2 A at the perforated portion or the thin portion, or by an interfacial separation at a boundary between the male belt-shaped base  21 A and the tearing guide piece. 
     The tearing guide piece  30  is not necessarily formed of the same material as the material of the zipper tape  20  but may be formed of co-extruded polypropylene resin and high-density polyethylene, oriented polyethylene terephthalate (OPET), oriented polypropylene (OPP), or oriented high-density polyethylene (HDPE). 
     Opening Trigger of Bag Body 
     As shown in  FIG.  1   , an opening trigger  61  is provided at the non-bonded region  16  near one of the point seals  120  of the bag body  10  (left one in  FIG.  1   ). 
     One end of the tearing guide piece  30  is located at the opening trigger  61  and the other end of the tearing guide piece  30  is located at the other one of the point seals  120 . 
       FIGS.  3 A and  3 B  show a configuration near the opening trigger  61 .  FIG.  3 A  shows a part of the zipper-tape bag  1 .  FIG.  3 B  shows a relevant part of the opening trigger  61 . 
     As shown in  FIGS.  3 A and  3 B , the opening trigger  61  is defined by a part of the tearing guide piece  30  and a C-shaped cut portion  60  formed in the film  11 A. It should be noted that the shape of the cut portion  60  of the opening trigger  61  is not particularly limited and may be in any shape such as a semicircular shape and a rectangular shape in addition to the C-shaped configuration as long as the cut portion  60  is capable of being easily pinched. 
     The cut portion  60  of the film  11 A and the part of the tearing guide piece  30  are layered and bonded to form an unsealing tab  17  (tab) that is continuous with a longitudinal end of the tearing guide piece  30 . 
     The unsealing tab  17  is formed by cutting the bonded film  11 A and the tearing guide piece  30  at the non-bonded region  16  using a C-shaped blade to form the cut portion  60  without cutting the non-bonded female member  22  and film  11 B using the C-shaped blade. It should be noted that, since the cut portion  60  is provided within the non-bonded region  16 , which is separated from the housing space  10 C of the bag body  10  containing the content P, the content P is kept from being leaked out through the cut portion  60 . 
     When the unsealing tab  17  is pinched to pull the tearing guide piece  30 , the tearing guide piece  30  linearly tears the film  11 A. 
     It should be noted that, since the tearing guide piece  30  and the film  11 A are mutually bonded by heat-sealing or using an adhesive, an interlaminar separation does not occur between the tearing guide piece  30  and the film  11 A when the zipper-tape bag  1  is unsealed. 
     Before the zipper-tape bag  1  is completely made, a zipper-tape bag  1 A without the top seal  14  as shown in  FIGS.  4  and  5    is produced. The content P is inputted through an input opening  18  of the zipper-tape bag  1 A. Subsequently, the top seal  14  and the grip  14 A are provided near a periphery of the input opening  18  of the zipper-tape bag  1 A and the input opening  18  is sealed, thereby producing the zipper-tape bag  1  containing the content P. 
     Manufacture of Zipper-Tape Bag 
     A process for manufacturing the zipper-tape bag  1 A before the content P is inputted will be described below as a part of the process for manufacturing the zipper-tape bag  1  of the first exemplary embodiment. It should be noted that the zipper-tape bag  1 A can be manufactured in a variety of processes. 
       FIG.  6    schematically shows a structure of a manufacturing machine for manufacturing the zipper-tape bag.  FIG.  7    is a perspective view showing a shaping unit of the manufacturing machine. 
     Manufacturing Machine 
     A manufacturing machine  5  shown in  FIG.  6    has a basic arrangement of a so-called three-sided bag-making machine and is configured to produce the zipper-tape bag  1 A by cutting the zipper tape member  2 A into the male member  21  and the tearing guide piece  30  and bonding the male member  21 , the tearing guide piece  30  and the female member  22  to the film  11 A. 
     The manufacturing machine  5  includes: a pair of tape feeders  51  each configured to feed the tape  2 , in which the male portion  21 B of the zipper tape member  2 A is engaged with the female portion  22 B of the female member  22 ; a separator  52  configured to cut the tape  2  into the male member  21  and the tearing guide piece  30 ; and a bag-manufacturing section  54  configured to heat-seal the male member  21 , the tearing guide piece  30  and the female member  22  to the film  11 A and, subsequently, form the film  11 A into the zipper-tape bag  1 A. 
     The location of the separator  52  may be slightly shifted upstream or downstream in the feeding direction of the tape  2 . However, in order to keep the separated male member  21  and the tearing guide piece  30  from being stretched due to a tension possibly applied when the tape  2  is fed, the separator  52  is preferably located immediately before a point at which the separated male member  21  and the tearing guide piece  30  are bonded to the film  11 A as shown in  FIG.  6   . 
     The tape feeder  51  is provided with detachably attached tape-winding rollers  511 , around which the tape  2  is wound, and is configured to feed the tape  2 . The tape  2  is fed toward the films  11 A,  11 B from a lateral side of the films  11 A,  11 B with respect to the feeding direction of the films  11 A,  11 B and are bent at a predetermined position using a roller or the like in the feeding direction for the films  11 A,  11 B to be fed into between the films  11 A,  11 B. 
     It is not necessary to continuously feed the tape  2  at a constant speed but the tape  2  may be fed in any manner (e.g. intermittently feeding). 
     The separator  52  is configured to cut the zipper tape member  2 A of the tape  2  into the male member  21  and the tearing guide piece  30 . For instance, the separator  52  is configured to temporarily disengage the delivered tape  2  and cut the zipper tape member  2 A into the male member  21  and the tearing guide piece  30  using a cutting blade  521  disposed at a predetermined position. 
     The male member  21  and the tearing guide piece  30  having been cut are delivered together with the female member  22  having been disengaged to the bag-manufacturing section  54  located downstream. 
     The bag-manufacturing section  54  includes: a pair of seal bars  541  configured to heat-seal the male member  21  and the tearing guide piece  30  having been separated by the separator  52  onto the film  11 A; a pair of seal bars  542  configured to heat-seal the female member  22  onto the film  11 A; a bottom former (not shown) configured to provide the bottom portion to the layered films  11 A,  11 B; a side former (not shown) configured to provide the lateral portions  10 A to the layered films  11 A,  11 B; a shaping unit  547  (see  FIGS.  7 ,  8   ); and a first cut portion  545  and a second cut portion  546  configured to cut the films into the zipper-tape bag  1 A. The seal bars  541 ,  542  define an attachment mechanism for attaching the male belt-shaped base  21 A and the female belt-shaped base  22 A onto the film  11 A. 
     A guide member (not shown) for positioning the male member  21  and the tearing guide piece  30  at a predetermined seal position with respect to the film  11 A is provided at an upstream of the seal bar  541 . Another guide member (not shown) for positioning the female member  22  at predetermined seal positions with respect to the film  11 A is provided upstream of the seal bar  542 . 
     The guide members are exemplarily each in a form of: a concave groove formed on a circumferential surface of a roller, the concave groove having a width corresponding to the width of the male member  21  and the male portion  21 B or the width of the tearing guide piece  30 ; or a frame member having an opening whose cross sectional profile is substantially the same as that of the male member  21 , the male portion  21 B or the tearing guide piece  30 . 
     The bottom former includes a bottom seal bar  543  configured to heat-seal the bottom portion  10 B to the films  11 A,  11 B to form the bottom seal  13 . 
     The side former includes a side seal bar  544  configured to heat-seal the lateral portions  10 A to the films  11 A,  11 B to form the side seals  12  and the partition seal  15 . 
     It should be noted that the film  11 A is not necessarily heat-sealed to the male member  21 , the female member  22  and the tearing guide piece  30 , but may be attached by various methods such as welding using ultrasonic waves and bonding using an adhesive. 
     As shown in  FIGS.  7 ,  8 A and  8 B , the shaping unit  547  includes: a support  547 A; a C-shaped shaping blade  547 B (blade) provided upright on the support  547 A; a rubber  547 C (movement restrictor) provided at an inside of the shaping blade  547 B and having a height corresponding to a distance from a surface of the support  547 A to a distal end of the shaping blade  547 B, the rubber  547 C restricting a movement of the shaping blade  547 B; and a driver (not shown) configured to, for instance, pneumatically advance and retract the support  547 A. 
     As shown in  FIG.  8 A , the shaping unit  547  stands by at a position remote from the film  11 A. When the support  547 A is advanced by the driver, the film  11 A and the tearing guide piece  30  are cut through from an outside of the film  11 A with the shaping blade  547 B as shown in  FIG.  8 B  to provide the C-shaped cut portion  60  and, consequently, the opening trigger  61 . When the shaping unit  547  is driven, the tearing guide piece  30  and the facing portion of the female belt-shaped base  22 A are in a non-bonded state. Accordingly, the facing portion of the female belt-shaped base  22 A facing the tearing guide piece  30  are not cut with the shaping blade  547 B. 
     In order to regulate the cutting depth of the shaping blade  547 B so that the films are half-cut, an elastic force of the rubber  547 C and the pneumatic force of the driver may be adjusted depending on the thickness and material of the film  11 A and the zipper tape  20  so that the shaping blade  547 B is movable only to a predetermined depth from the surface of the film  11 A. More specifically, the rubber  547 C may be replaced with a different rubber having a different elastic force. 
     A filling machine (not shown) for filling the formed zipper-tape bag  1 A with the content P is provided downstream of the manufacturing machine  5 . The filling machine includes a seal bar (not shown) for forming the top seal  14 . 
     In the first exemplary embodiment, the side seal bar  544 , the shaping unit  547  and the non-illustrated seal bar for forming the top seal  14  define at least a part of a mechanism for forming the tab. In this mechanism, the side seal bar  544  and the seal bar for forming the top seal  14  provide a mechanism for bonding a circumference of the non-bonded region  16  without bonding the non-bonded region  16 . In order to keep the tearing guide piece  30  and the facing portion of the female belt-shaped base  22 A positioned within the non-bonded region  16  from being bonded using the above mechanism, for instance, the shape of the seal bar may be designed so that the seal bar does not comes into contact with the portion corresponding to the non-bonded region  16 . 
     Manufacturing Method of Zipper-Tape Bag 
     Next, a process for manufacturing the zipper-tape bag  1 A, which has not contained the content P for the zipper-tape bag  1 , using the manufacturing machine  5  will be described below with reference to the attached drawings. 
     The manufacturing method of the zipper-tape bag  1 A is conducted using, for instance, the manufacturing machine  5  for a three-sided bag-making process shown in  FIG.  6   . The manufacturing method includes: feeding the tape  2  (tape feeding step); cutting the tape  2  into the male member  21  and the tearing guide piece  30  (separation step); attachment step for heat-sealing the male member  21 , the tearing guide piece  30  and the female member  22  to the film  11 A (attachment step); and forming the film  11 A into the zipper-tape bag  1 A (bag-making step). 
     Initially, the long-width female member  22  and the zipper tape member  2 A, which includes the short-width male member  21  integrated with the tearing guide piece  30 , are separately formed by extrusion or the like. Then, the female portion  22 B of the female member  22  and the male portion  21 B of the zipper tape member  2 A are engaged to form the integrated tape  2 . The tape  2  is wound around each of the tape-winding rollers  511 . 
     In the tape feeding step, the tape  2  drawn from the tape-winding roller  511  is delivered into between the layered films  11 A,  11 B, which have been obtained by halving the film fed from a film-winding roller  111 . 
     In the separation step, the zipper tape member  2 A of the tape  2  delivered from the tape feeder  51  is cut using the cutting blade  521  of the separator  52  into the male member  21  and the tearing guide piece  30 . 
     The male member  21  and the tearing guide piece  30  having been cut are guided by the position guide member (not shown) into a predetermined positional relationship with respect to the film  11 A while being layered. 
     In the attachment step, a predetermined bonding region of the male member  21  and the tearing guide piece  30  are bonded (i.e. heat-sealed) to the film  11 A using the seal bar  541 . 
     Subsequently, the female member  22  is guided to be layered on a predetermined position of the film  11 A attached with the male member  21  and the tearing guide piece  30 . Then, a predetermined bonding region of the female member  22  is heat-sealed on the film  11 A using the seal bar  542 . 
     In the bag making step, the film  11 B is layered on the film  11 A on which the male member  21 , the female member  22  and the tearing guide piece  30  are attached in the attachment step. Subsequently, the pair of lateral portions  10 A and the bottom portion  10 B are provided. The films  11 A,  11 B are heat-sealed using the bottom seal bar  543  to form the bottom seal  13 . The films  11 A,  11 B are further heat-sealed using the side seal bar  544  to form the side seals  12  and the partition seal  15 . When the side seals  12  and the partition seal  15  are formed, ends of the zipper tape  20  and the tearing guide piece  30  are bonded to the films  11 A,  11 B. In the first exemplary embodiment, the non-bonded region  16 , at which the tearing guide piece  30  is not bonded to the facing portion of the female belt-shaped base  22 A, is formed between one of the side seals  12  and the partition seal  15 . The seal bar is designed to keep the tearing guide piece  30  from being bonded to the facing portion of the female belt-shaped base  22 A at the non-bonded region  16 . 
     Subsequently, the cut portion  60  is provided to the non-bonded region  16  of the bag body  10  to form the tab. In order to form the tab, the shaping unit  547  is used to cut the film  11 A and a part of the tearing guide piece  30  without cutting the film  11 B and the female belt-shaped base  22 A to form the cut portion  60 . 
     After the content P is inputted into the thus produced zipper-tape bag  1 A, the top seal  14  and the grip  14 A are formed. 
     Use of Zipper-Tape Bag 
     The use of the zipper-tape bag  1  will be described below with reference to the attached drawings. 
       FIG.  9    is a cross section illustrating the zipper-tape bag having been unsealed. 
     When a user takes out the content P from the zipper-tape bag  1  for the first time, the user pulls the unsealing tab  17  formed on the opening trigger  61  as shown in, for instance,  FIG.  3 A . The film  11 A and the tearing guide piece  30  are pulled in conjunction with pulling the unsealing tab  17 . Then, the film  11 A of the zipper-tape bag  1  starts being torn. 
     When the torn part of the film  11 A reaches the partition seal  15 , the tearing guide piece  30  tears the film  11 A while being peeled off from the female belt-shaped base  22 A. The tearing guide piece  30  thus linearly tears the film  11 A, thereby making an opening at the opening  19  as shown in  FIG.  9    to unseal the bag. 
     After the unsealing, the opening edges of the opening  19  are widely separated to release the engagement between the male portion  21 B and the female portion  22 B, whereby the housing space  10 C is open to an outside through an opening  19 . When the housing space  10 C is open to the outside, the inputted content P can be taken out. 
     When the male portion  21 B and the female portion  22 B are subsequently engaged, the housing space  10 C is sealed again. 
     Advantage of First Exemplary Embodiment 
     As described above, in the first exemplary embodiment, the unsealing tab  17  is formed by cutting the film  11 A, which is attached with the tearing guide piece  30  and the short-width male belt-shaped base  21 A, at the non-bonded region  16  where the tearing guide piece  30  and the long-width female belt-shaped base  22 A are non-bonded. Accordingly, the unsealing tab  17  can be easily formed by simply cutting the film  11 A, thereby improving the productivity. 
     In the first exemplary embodiment, the tearing guide piece  30  is separated from the zipper tape member  2 A before the tearing guide piece  30  is attached to the film  11 A. 
     Accordingly, when the tearing guide piece  30 , which has already been independently heat-sealed to the film  11 A, is used to tear and unseal the bag body  10 , no force for separating the tearing guide piece  30  from the male member  21  is necessary but only a force for tearing the bag body  10  is necessary, so that a large load is not applied in unsealing the bag. 
     In particular, the tearing guide piece  30  and the male member  21  of the zipper tape  20  are integrated as the zipper tape member  2 A and are separated immediately before being attached to the film  11 A. Accordingly, even when a tension causing different degree of stretch is applied during a production process, the female member  22 , the male member  21  and the tearing guide piece  30  can be positioned and attached to a predetermined position before these components are stretched. Thus, the female member  22 , the male member  21  and the tearing guide piece  30  are kept from being stretched at different rates, so that the female member  22 , the male member  21  and the tearing guide piece  30  can be attached to the film  11 A without causing wrinkles and the like on the film, thereby preventing deterioration in the yield rate and achieving favorable production. 
     In particular, since the cutting blade  521  of the separator  52  is used for separation, the tearing guide piece  30  can be easily separated from the zipper tape member  2 A. 
     Additionally, the zipper tape member  2 A including the short-width male member  21  integrated with the tearing guide piece  30  is used in the first exemplary embodiment. 
     Accordingly, the zipper tape member  2 A can be easily manufactured with a simple arrangement, and the tearing guide piece  30  and the zipper tape  20  can be easily separated. 
     Further, since the tearing guide piece  30  and the female belt-shaped base  22 A are not bonded in the non-bonded region  16 , smooth unsealing of the bag is expectable. 
     It should be noted that the following arrangement is usable in order to use the zipper tape member  2 A integrally provided with the tearing guide piece  30  and to separate the tearing guide piece  30  before the zipper tape member  2 A is attached to the film  11 A. Specifically, when the zipper tape member  2 A integrated with the tearing guide piece  30  is attached to the film  11 A and the tearing guide piece  30  is pulled to tear the bag body  10  when the bag is unsealed, a force for tearing the tearing guide piece  30  from the male member  21  may become necessary in addition to the force for tearing the bag body  10 . An exemplary means for solving the above problem is as follows. 
     A manufacturing method for manufacturing a zipper-tape bag including: a bag body formed by bending a single film or layering at least two sheets of film; a zipper tape including a female member including a female belt-shaped base attached to one of opposing inner surfaces of the bag body and a female portion provided on the female belt-shaped base, and a male member including a male belt-shaped base attached to the one of opposing inner surfaces of the bag body and a male portion, which is engageable with the female member, provided on the male belt-shaped base, a width of one of the female belt-shaped base and the male belt-shaped base being elongated toward an end in the width direction with respect to a width of the other of the female belt-shaped base and the male belt-shaped base; and a longitudinal separation strip disposed between the female belt-shaped base and the male belt-shaped base or between the film attached with shorter-width one of the female belt-shaped base and the male belt-shaped base and longer-width one of the female belt-shaped base and the male belt-shaped base, the separation strip being configured to cut the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base to form the opening in the bag body, the method, which is performed by using a zipper tape member integrally including the shorter-width one of the female belt-shaped base and the male belt-shaped base and the separation strip, includes separating the separation strip of the zipper tape member from the shorter-width one of the female belt-shaped base and the male belt-shaped base, and attaching the separated shorter-width one of the female belt-shaped base and the male belt-shaped base and the separation strip to the film. 
     According to the above arrangement, the separation strip is already separated from the zipper tape when being attached to the film. Thus, no force for separating the separation strip from the male belt-shaped base or the female belt-shaped base is necessary when the separation strip tears the bag body but only a force for tearing the bag body is necessary, so that a large load is not applied in unsealing the bag. In particular, since the separation strip is separated from the zipper tape immediately before being attached to the film, even when a tension causing different degree of stretch is applied during the production process, the female member, the male member and the separation strip can be appropriately positioned and attached at predetermined positions before being stretched. Thus, the female member, the male member and the separation strip are kept from being stretched at different rates, so that the female member, the male member and the separation strip can be attached to the film without causing wrinkles and the like on the film, thereby preventing deterioration in the yield rate and achieving favorable production. 
     Second Exemplary Embodiment 
     Next, a second exemplary embodiment of the invention will be described below with reference to  FIGS.  10 A and  10 B . 
     The second exemplary embodiment is the same as the first exemplary embodiment except for the structure of the base. 
       FIGS.  10 A and  10 B  are cross sectional views of a relevant part of the zipper-tape bag according to the second exemplary embodiment.  FIG.  10 A  is a cross sectional view of a relevant part of the tape.  FIG.  10 B  is another cross sectional view of the relevant part of the zipper-tape bag. 
     Structure of Tape 
     As shown in  FIG.  10 A , the tape  2  of the second exemplary embodiment includes: a longitudinal belt-shaped portion  23  having a bent portion  23 A (folded portion) folded substantially at a width center of the belt-shaped portion  23 ; the male portion  21 B and the female portion  22 B arranged in parallel along the longitudinal direction of the belt-shaped portion  23 ; and the tearing guide piece  30  disposed on the belt-shaped portion  23  between and in parallel to the male portion  21 B and the female portion  22 B. In the second exemplary embodiment, the zipper tape includes the belt-shaped portion  23 , the male portion  21 B and the female portion  22 B. The tearing guide piece  30  is provided on the belt-shaped portion  23 . 
     The facing portion is defined at a portion of the folded belt-shaped portion  23  facing the tearing guide piece  30  through a gap S. The tearing guide piece  30  and the facing portion are not bonded at the non-bonded region  16 . 
     The male portion  21 B and the female portion  22 B are equidistant from the bent portion  23 A to be opposed and engageable with each other. 
     First and second convex portions  21 C,  22 C thicker than the belt-shaped portion  23  are provided on the belt-shaped portion  23 . The first convex portion  21 C and the second convex portion  22 C are located between the male portion  21 B and the bent portion  23 A to be spaced apart in the width direction of the belt-shaped portion  23  when the belt-shaped portion  23  is folded at the bent portion  23 A and the male portion  21 B and the female portion  22 B are engaged. The distance between the first convex portion  21 C and the second convex portion  22 C is the same as or slightly larger than the width of the tearing guide piece  30 . 
     The tearing guide piece  30  is provided between the first convex portion  21 C and the second convex portion  22 C and is laminated on the belt-shaped portion  23 . In other words, when the tearing guide piece  30  is separated from the zipper tape using, for instance, the cutting blade  521  of the separator  52 , the width of the male member  21  becomes short whereas the width of the female member  22  becomes long, as shown in  FIG.  10 B . 
     It should be noted that the first and second convex portions  21 C,  22 C and the tearing guide piece  30  may alternatively be provided between the female portion  22 B and the bent portion  23 A. In this case, when the male member  21 , the female member  22  and the tearing guide piece  30  are separated, the width of the female member  22  becomes short whereas the width of the male member  21  becomes long. It should be noted that the tearing guide piece  30  may be laminated on the belt-shaped portion  23  without providing the first and second convex portions  21 C,  22 C. 
     Manufacture of Zipper-Tape Bag 
     In order to manufacture the zipper-tape bag  1 , the manufacturing machine  5  in the first exemplary embodiment is used to manufacture the zipper-tape bag  1 A (i.e. the zipper-tape bag  1  before the top seal  14  is formed). 
     The shaping unit  547  of the manufacturing machine  5  is configured to cut the tearing guide piece  30  and the film  11 A attached with the zipper tape  20  to form the cut portion  60  without cutting the facing portion of the base portion of the belt-shaped portion  23  and the film  11 B, with the folded belt-shaped portion  23  and the tearing guide piece  30  not being bonded (see  FIG.  1   ). 
     In order to manufacture the zipper-tape bag  1 A using the manufacturing machine  5 , the drawn tape  2  is cut at both ends of the tearing guide piece  30  in the width direction using the cutting blade  521  of the separator  52  to separate the tape  2  into the zipper tape  20 , in which the male portion  21 B of the short-width male member  21  is engaged with the female portion  22 B of the long-width female member  22 , and the tearing guide piece  30 . A part  23 B (see  FIG.  10 B ) of the belt-shaped portion  23  is laminated on the tearing guide piece  30  having been cut out. It should be noted that, for the convenience of showing that the tearing guide piece  30  has been cut, a gap is illustrated between the male member  21  and the tearing guide piece  30  and between the female member  22  and the tearing guide piece  30  in  FIG.  10 B . However, the zipper tape  20  is substantially in contact with the tearing guide piece  30  in an actual product. 
     The separated zipper tape  20  and the tearing guide piece  30  are guided by a position guide member (not shown) into a predetermined positional relationship with respect to the film  11 A and heat-sealed. It should be noted that the tearing guide piece  30  is heat-sealed to the film  11 A through the part  23 B of the belt-shaped portion  23 . Further, the female member  22  is heated from the side of the film  11 A to heat-seal the second convex portion  22 C onto the film  11 A. 
     The lateral portion  10 A and the bottom portion  10 B are provided to the layered films  11 A,  11 B and the tab is formed. Specifically, the side seal bar  544  is used to form the side seals  12  and the partition seal  15 . The region interposed between the seals define the non-bonded region  16 . The facing portion of the folded belt-shaped portion  23  and the tearing guide piece  30  are not bonded at the non-bonded region  16 . The shaping unit  547  cuts the tearing guide piece  30  and the film  11 A attached with the zipper tape  20  without cutting the facing portion of the base portion of the belt-shaped portion  23  and the film  11 B to form the cut portion  60 . 
     After the content P is inputted into the thus produced zipper-tape bag  1 A, the top seal  14  and the grip  14 A are formed. 
     Advantage of Second Exemplary Embodiment 
     In the second exemplary embodiment, the tape  2 , which includes the belt-shaped portion  23  integrally including the male portion  21 B and the female portion  22 B and the tearing guide piece  30  integrated with the belt-shaped portion  23 , is heat-sealed to the film  11 A after the tape  2  is cut into the male member  21 , the female member  22  and the tearing guide piece  30 . 
     According to the above arrangement, since the tearing guide piece  30  has been separated into an independent component, a force for separating the tearing guide piece  30  from the belt-shaped portion  23  is not necessary when the bag body  10  is torn to unseal the bag. Accordingly, only a force for tearing the bag body  10  is required in order to unseal the bag, so that a large load is not applied in an unsealing process. 
     It should be noted that the following arrangement is usable in order to separate the zipper tape  2  integrally provided with the tearing guide piece  30  before the zipper tape  2  is attached to the film  11 A in the second exemplary embodiment. 
     A manufacturing method for manufacturing a zipper-tape bag including: a bag body formed by bending a single film or layering at least two sheets of film; a zipper tape including a female member including a female belt-shaped base attached to one of opposing inner surfaces of the bag body and a female portion provided on the female belt-shaped base, and a male member including a male belt-shaped base attached to the one of opposing inner surfaces of the bag body and a male portion, which is engageable with the female member, provided on the male belt-shaped base, a width of one of the female belt-shaped base and the male belt-shaped base being elongated toward an end in the width direction with respect to a width of the other of the female belt-shaped base and the male belt-shaped base with the female portion and the male portion being engaged; and a longitudinal separation strip disposed between the female belt-shaped base and the male belt-shaped base or between the film attached with shorter-width one of the female belt-shaped base and the male belt-shaped base and longer-width one of the female belt-shaped base and the male belt-shaped base, the separation strip being configured to cut the film attached with the shorter-width one of the female belt-shaped base and the male belt-shaped base to form the opening in the bag body, the method, which is performed by using a zipper tape member including the female member, the male member, the belt-shaped portion provided with the female member and the male member, and the separation strip located on the belt-shaped portion between the female member and the male member, includes dividing the belt-shaped portion at both ends of the separation strip of the zipper tape member in the width direction to separate the belt-shaped portion into the female member, the male member and the separation strip, and attaching the separated shorter-width one of the female belt-shaped base of the female member and the male belt-shaped base of the male member and the separation strip to the film. 
     According to the above arrangement, even with the use of the zipper tape member integrally provided with the male portion and the female portion, the separation strip is already separated from the zipper tape when being attached to the film. 
     Thus, no force for separating the separation strip from the male belt-shaped base or the female belt-shaped base is necessary when the separation strip tears the bag body but only a force for tearing the bag body is necessary, so that a large load is not applied in unsealing the bag. 
     In particular, since the separation strip is separated from the zipper tape immediately before being attached to the film, even when a tension causing different degree of stretch is applied during the production process, the female member, the male member and the separation strip can be appropriately positioned and attached at predetermined positions before being stretched. Thus, the female member, the male member and the separation strip are kept from being stretched at different rates, so that the female member, the male member and the separation strip can be attached to the film without causing wrinkles and the like on the film, thereby preventing deterioration in the yield rate and achieving favorable production. 
     Third Exemplary Embodiment 
     Next, a third exemplary embodiment of the invention will be described below with reference to  FIGS.  11  to  15   . 
     The third exemplary embodiment is different from the first exemplary embodiment in that the zipper tape is attached to the bag and the separation strip is provided to the bag body via a base. 
     Structure of Bag 
       FIGS.  11 ,  12 ,  13 A and  13 B  shows a bag according to the third exemplary embodiment. 
     As shown in  FIG.  11   , the bag  3  includes the bag body  10 , and a tape  4  bonded to one of inner surfaces of the bag body  10 . 
     The bag body  10  is provided with the side seals  12 , the bottom seal  13 , the top seal  14  and the partition seal  15 . The region surrounded by one of the side seals  12 , the top seal  14  and the partition seal  15  defines the non-bonded region  16 . The profile of the non-bonded region  16  is ellipsoidal in a plan view. The opening trigger  61  is formed in the non-bonded region  16 . 
       FIG.  12    illustrates a part near the opening trigger shown in  FIG.  11    in an enlarged manner. 
     As shown in  FIG.  12   , the opening trigger  61  includes a part of the tape  4  and the C-shaped cut portion  60  formed in the film  11 A. 
     The cut portion  60  of the film  11 A and the part of the tape  4  form the unsealing tab  17  that is continuous with a longitudinal end of the tape  4 . 
     The unsealing tab  17  is formed by piercing the film  11 A and the tape  4  with the C-shaped blade at the position of the non-bonded region  16  without piercing the film  11 B (see  FIG.  13 A ). 
       FIG.  13 A  shows a cross section taken along lines A-A traversing the tape  4  in the non-bonded region  16  shown in  FIG.  12   .  FIG.  13 B  shows a cross section taken along lines B-B traversing the tape  4  in the partition seal  15  shown in  FIG.  12   . 
     As shown in  FIGS.  13 A and  13 B , the tape  4  includes an elongated base  41  bonded to the film  11 A at a first side thereof, the tearing guide piece  30  bonded along the longitudinal direction of the base  41  to a second side of the base  41  opposite the first side, and protrusions  42  integrally formed to the base  41 . 
     The base  41  is an elongated member extending along the top seal  14  (see  FIG.  11   ). The base  41  has a rectangular cross sectional profile in a plane orthogonal to a longitudinal direction of the base  41 . 
     The tearing guide piece  30  is a longitudinal separation strip that tears the film  11 A and the base  41  to form the opening. 
     Though the cross sectional profile of the tearing guide piece  30  is rectangular in  FIGS.  13 A and  13 B , the cross sectional profile of the tearing guide piece  30  is not necessarily rectangular, but may alternatively be triangular or semicircular in the third exemplary embodiment. Further alternatively, the tearing guide piece  30  may be a string-shaped component. 
     The protrusions  42  protrude from parts of the base  41  not bonded with the tearing guide piece  30  in a direction orthogonal to the side of the base  41  at which the tearing guide piece  30  is bonded. 
     The protrusions  42  are provided on both sides in a width direction of the base  41  across the tearing guide piece  30 . 
     Though the cross sectional profile of the protrusions  42  is rectangular in  FIGS.  13 A and  13 B , the cross sectional profile of the protrusions  42  is not necessarily rectangular but may alternatively be triangular, semicircular or the like. 
     Mutually opposing surfaces  30 A,  42 A of the tearing guide piece  30  and the protrusion  42  are not in contact with each other. In other words, a gap S is present between each of the surfaces  30 A of the tearing guide piece  30  facing corresponding one of the protrusions  42  and the surface  42 A of the corresponding one of the protrusions  42  facing the tearing guide piece  30 . The gap S is formed along the longitudinal direction of the tape  4 . 
     The base  41  and the protrusions  42  are integrally made of the same material. 
     The base  41 , which has been integrally provided with the tearing guide piece  30 , is attached to the film  11 A defining one of the inner surfaces of the bag body  10 . 
     As shown in  FIG.  13 A , a part of the film  11 B facing the tearing guide piece  30  (facing portion) is not bonded to a surface of each of the tearing guide piece  30  and the protrusions  42  opposite the surface attached with the base  41  at the non-bonded region  16 . 
     As shown in  FIG.  13 B , the inner surface of the film  11 B is bonded to the surfaces of the protrusions  42  opposite the surface attached with the base  41  at the partition seal  15 . 
     As shown in  FIG.  12   , the cut portion  60  is a C-shaped component in a plan view. The opening edge of the C-shaped cut portion  60  is, as shown in  FIGS.  12  and  13 A , located at positions corresponding to the gaps S between the tearing guide piece  30  and the protrusions  42 . The opening edge of the cut portion  60  defines a tearing start position of the film  11 A and the tearing guide piece  30 . When the unsealing tab  17  is pulled, the film  11 A is torn by the tearing guide piece  30  along the longitudinal direction in which the gap S is formed, thereby ensuring linearity of the unsealing process. 
     Structure of Manufacturing Machine 
       FIG.  14    shows a manufacturing machine  50  of the bag according to the third exemplary embodiment. 
     As shown in  FIG.  14   , the manufacturing machine  50  is configured to manufacture the bag  3  shown in  FIG.  11   , which has not been provided with the top seal  14 . The manufacturing machine  50  has a basic arrangement of a three-sided bag-making machine in the same manner as the manufacturing machine  5 . 
     The manufacturing machine  50  includes: the pair of tape feeders  51  configured to feed the tape  4  integrally including the base  41  and the tearing guide piece  30 , and the bag-manufacturing section  54  configured to heat-seal the tape  4  onto the film  11 A to form the bag. It should be noted that the manufacturing machine  50  does not include the separator  52  unlike the manufacturing machine  5 . 
     The tape feeders  51  each include the detachably attached tape-winding roller  511  around which the tape  4  is wound and is configured to feed the tape  4 . The tape  4  is fed toward the films  11 A,  11 B from a lateral side of the films  11 A,  11 B with respect to the feeding direction of the films  11 A,  11 B and is bent at a predetermined position using a roller and the like in the feeding direction for the films  11 A,  11 B to be fed. 
     The bag-manufacturing section  54  includes: a pair of seal bars  540  configured to heat-seal the tape  4  onto the film  11 A; a bottom former (not shown) configured to provide the bottom portion to the layered films  11 A,  11 B; a side former (not shown) configured to provide the lateral portions  10 A to the layered films  11 A,  11 B; a shaping unit  547  (see  FIG.  7   ) configured to provide the opening trigger  61 ; and a first cut portion  545  and a second cut portion  546  configured to cut the films into the bag. 
     The bottom former includes the bottom seal bar  543 . The side former includes the side seal bar  544  configured to form the side seals  12  and the partition seal  15 . 
     Detailed arrangement of the shaping unit  547  is shown in  FIG.  15   .  FIG.  15    illustrates how a part of the bag, which is viewed in a direction orthogonal to the longitudinal direction of the tape  4  slightly closer to an edge of one of the side seals  12  than A-A lines in  FIG.  12   , is processed. 
     As shown in  FIG.  15   , the shaping unit  547  includes: the support  547 A; the driver (not shown) for advancing and retracting the support  547 A between the position indicated by imaginary lines and the position indicated by solid lines; the shaping blade  547 B attached to the support  547 A; and the rubber  547 C for restricting the movement of the shaping blade  547 B. The shaping blade  547 B is applied from an outer surface of the film  11 A to cut the film  11 A and the tape  4  to form the C-shaped cut portion  60  and the opening trigger  61 . 
     A filling machine (not shown) for filling the formed bag with the content P is provided downstream of the manufacturing machine  50 . 
     Manufacturing Method of Bag 
     Next, a process for manufacturing the bag  3 , which has not contained the content P, using the manufacturing machine  50  will be described below. 
     Using the manufacturing machine  50 , the tape  4  is fed (tape feeding step), the tape  4  is heat-sealed onto the film  11 A (attachment step) and the zipper-tape bag  1 A is formed from the film  11 A (bag making step). 
     Initially, the base  41  and the protrusions  42  are integrally formed by extrusion molding or the like and the tearing guide piece  30  is bonded to the base  41  to produce the tape  4 . The tape  4  is wound around each of the tape-winding rollers  511 . 
     In the tape feeding step, the tape  4  drawn from each of the tape-winding rollers  511  is delivered into between the layered films  11 A,  11 B, which are obtained by halving the film fed from the film-winding roller  111 . 
     In the attachment step, the tape  4  is bonded to one of the films  11 A using a seal bar  540 . 
     In the bag making step, the film  11 B is layered on the film  11 A on which the tape  4  is attached in the attachment step. Subsequently, the pair of lateral portions  10 A and the bottom portion  10 B are provided. The bottom seals  13  are formed using the bottom seal bars  543 . The side seals  12  and the partition seal  15  are formed using the side seal bars  544 . 
     The non-bonded region  16 , at which the tearing guide piece  30  and the protrusions  42  are not bonded to the film  11 B, is formed between one of the side seals  12  and the partition seal  15  during the formation of the side seals  12  and the partition seal  15 . In order to form the non-bonded region  16 , the seal bar is designed not to bond the part around the portion to be the unsealing tab  17 . 
     Subsequently, the shaping unit  547  is driven to provide the cut portion  60  at the non-bonded region  16  to form the unsealing tab  17 . In other words, the shaping unit  547  forms the tab by cutting into the film  11 A and a part of the tape  4  including the tearing guide piece  30  without cutting the film  11 B. 
     After the content P is inputted into the thus produced bag, the top seal  14  and the grip  14 A are formed. In order to unseal the thus produced bag  3 , the unsealing tab  17  is pinched to pull the tearing guide piece  30  from the film  11 A. Then, a part of the base  41  and the film  11 A are torn apart to form the opening. 
     Advantage of Third Exemplary Embodiment 
     The tape  4  and a part of the film  11 B facing the film  11 A bonded with the base  41  are not bonded at the non-bonded region  16  and the unsealing tab  17  is provided at the non-bonded region  16 . Accordingly, the unsealing tab  17  can be easily formed by simply cutting the tape  4  and film  11 A attached with the base  41 , thereby improving the productivity of the bag  3 . 
     The tearing guide piece  30  is not bonded to the film  11 B, which is not to be torn. Accordingly, when the unsealing tab  17  is pinched to pull the tearing guide piece  30 , the bag can be expected to be smoothly unsealed. 
     The protrusions  42  and the tearing guide piece  30  are not in contact with each other and the gaps S are present between the protrusions  42  and the tearing guide piece  30 . Accordingly, the resin of the tearing guide piece  30  is kept from being fused with the resin of the base  41  when the tape is manufactured, so that it is expectable that a tearing direction for tearing the base  41  using the tearing guide piece  30  is stabilized. 
     Modifications 
     Preferable configurations for practicing the invention and the like have been disclosed above, however, the invention is not limited thereto. In other words, while the invention has been particularly explained and illustrated mainly in relation to a specific exemplary embodiment, a person skilled in the art could make various modifications in terms of materials, quantity or other particulars to the above described exemplary embodiments without deviating from the technical idea or any object of the invention. 
     Accordingly, the description that limits the materials, the layer structure and the like is only an example to make the invention easily understood, but is not intended to limit the invention, so that the invention includes the description using a name of component without a part of or all of the limitation on the shape and the material etc. 
     For instance, though the first exemplary embodiment has the short-width male member  21  and long-width female member  22 , the arrangement may be reversed. 
     Specifically, the male member  21  may have a longer width, the female member  22  may have a shorter width and the zipper tape member  2 A may integrally include the female member  22  and the tearing guide piece  30 . In the above arrangement, the male member  21  may be heat-sealed onto the film  11 A after the separated female member  22  and the tearing guide piece  30  are heat-sealed onto the film  11 A. 
     Though the zipper tape member  2 A is heat-sealed onto the film  11 A after being cut into the male member  21  and the tearing guide piece  30  in the first exemplary embodiment, the zipper tape member  2 A may be heat-sealed onto the film  11 A without being cut. 
     For instance, the zipper tape member  2 A may have the tearing guide piece  30  at an end of the male belt-shaped base  21 A of the male member  21  in the width direction in a manner capable of interlaminar peeling, as shown in  FIG.  16   . After the zipper tape member  2 A is heat-sealed onto the film  11 A, the female member  22  is heat-sealed onto the film  11 A. Subsequently, the unsealing tab  17  is formed at the non-bonded region  16  using the shaping unit  547  to manufacture the zipper-tape bag  1 A. In order to unseal the bag, the unsealing tab  17  is pinched and pulled to tear the bag body  10  with the interlaminar peeling of the tearing guide piece  30  from the male member  21 . 
     The use of the zipper tape member  2 A as shown in  FIG.  16    eliminates the need for cutting the zipper tape member  2 A, allowing simplification of the structure of the manufacturing machine. In particular, since the tearing guide piece  30  is integrated with the male member  21  in a manner capable of interlaminar peeling, it is not necessary to apply a large force in order to separate the tearing guide piece  30  from the male member  21  when the bag is unsealed, thereby keeping openability of the bag from being impaired. 
     Though the end in the width direction of the tearing guide piece  30  is exemplarily integrally bonded to the end of the male member  21  in the width direction in the first exemplary embodiment, the zipper tape member  2 A may, for instance, alternatively be configured as shown in  FIG.  17 A . 
     The zipper tape member  2 A has the tearing guide piece  30  integrally layered on the male belt-shaped base  21 A of the male member  21 , as shown in  FIG.  17 A . The zipper tape member  2 A is cut into the tearing guide piece  30  and the male member  21  in the separation step and heat-sealed to the film  11 A. It should be noted that the part  23 B of the male belt-shaped base  21 A is layered on the cut tearing guide piece  30  as shown in  FIG.  17 B  and the tearing guide piece  30  is heat-sealed onto the film  11 A through the part  23 B of the male belt-shaped base  21 A. Subsequently, the unsealing tab  17  may be formed at the non-bonded region  16  to manufacture the zipper-tape bag  1 A. 
     In the invention, when the zipper tape  20  and the tearing guide piece  30  are heat-sealed onto the film  11 A, it is preferable to provide a clearance  25  between the male member  21  and the tearing guide piece  30  and between the tearing guide piece  30  and the female member  22  as shown in  FIG.  18   . 
     The exemplary embodiment provided with the clearance  25  as shown in  FIG.  18    prevents the tearing guide piece  30  from being integrated with the female member  22  and/or the male member  21  even when a molten resin spreads widthwise in, for instance, heat-sealing the male member  21 , the female member  22  and the tearing guide piece  30  onto the film  11 A. Thus, it is not necessary to tear the integrated portion at the time of unsealing the bag, so that the bag body  10  can be easily torn and unsealed. 
     It should be noted that the clearance  25  is required to be wide enough to receive the shaping blade  547 B. On the other hand, when the clearance  25  is excessively wide, the film  11 A may be freely torn during the shaping process to impair linear cuttability. Accordingly, the dimension of the clearance  25  is set, for instance, in a range from 0.5 mm to 5 mm, preferably in a range from 0.5 mm to 3.0 mm, more preferably at 1.0 mm. 
     Further, as shown in  FIG.  19   , a first convex portion  21 C and a second convex portion  22 C may be provided to an end of the male belt-shaped base  21 A and the female belt-shaped base  22 A in the width direction adjacent to the tearing guide piece  30  in the invention, the first convex portion  21 C and the second convex portion  22 C respectively having thickness greater than the thickness of the male belt-shaped base  21 A and the thickness of the female belt-shaped base  22 A. 
     In the exemplary embodiment shown in  FIG.  19   , the first convex portion  21 C and the second convex portion  22 C having greater rigidity are located on both sides of the tearing guide piece  30  in the width direction. Accordingly, when the tearing guide piece  30  is used to tear and unseal the bag body  10 , the first convex portion  21 C and the second convex portion  22 C serve as guides for tearing the bag body  10 . Accordingly, the bag body  10  is kept from being torn in an undesired direction, thereby creating a linear opening edge. Further, the first convex portion  21 C and the second convex portion  22 C are located at the opening edge of the unsealed bag body  10 . Accordingly, when the opening edges are widely separated to disengage the male portion  21 B and the female portion  22 B, the first convex portion  21 C and the second convex portion  22 C form step-shaped portions to serve as slip stoppers, thereby facilitating the opening process. 
     In particular, it is preferable that the thicknesses of the first convex portion  21 C and the second convex portion  22 C are made equal to the thickness of the tearing guide piece  30 . According to the above arrangement, the heights of the first convex portion  21 C and the second convex portion  22 C pressed against the films at the time of the heat-sealing can be equalized, so that the heat-sealing process can be performed in a single step using a seal bar of a simple shape having a planar pressing surface, thereby easily simplifying the manufacturing machine and improving the production efficiency. 
     Further, the zipper tape member  2 A is not necessarily provided by integrating the short-width male member  21  with the tearing guide piece  30 , but may be provided by integrating the long-width female member  22  with the tearing guide piece  30 , for instance, as shown in  FIG.  20 A . 
     The zipper tape member  2 A of an exemplary embodiment shown in  FIG.  20 A  includes the tearing guide piece  30  laminated in a manner capable of interlaminar peeling on a surface of the female belt-shaped base  22 A of the female member  22  on which the female portion  22 B is provided. The tearing guide piece  30  is provided at a position where a distance from a base end of the female portion  22 B of the female member  22  to an end of the tearing guide piece  30  in the width direction is longer than a distance from a base end of the male portion  21 B of the male member  21  to an end of the male belt-shaped base  21 A in the width direction. 
     The tearing guide piece  30  is peeled off from the zipper tape member  2 A by interlaminar peeling and the separated tearing guide piece  30  and the male member  21  are heat-sealed onto the film  11 A. Subsequently, the separated female member  22  is heat-sealed onto the film  11 A. Subsequently, the unsealing tab  17  may be formed at the non-bonded region  16  to manufacture the zipper-tape bag  1 A. 
     Alternatively, the clearance  25  may be provided between the male belt-shaped base  21 A and the tearing guide piece  30  as shown in  FIG.  20 B . 
     Though the zipper tape  20  includes the single male portion  21 B and the single female portion  22 B in the exemplary embodiments, a plurality of the male portions  21 B and the female portions  22 B may alternatively be provided. 
     Though the protrusions  42  are formed on the flat base  41  in the third exemplary embodiment, the base  41  may have a thin portion between each of the protrusions  42  and the tearing guide piece  30  as shown in  FIG.  21   . Specifically, the gap S is provided between each of the protrusions  42  and the tearing guide piece  30  and cuts  410  each continuous with the gap S is formed in the base  41 . 
     Though the two protrusions  42  are disposed on both ends in the width direction of the base  41  in the third exemplary embodiment, only a single protrusion  42  may be provided. Further, though the base  41  is a single component, the base  41  may be divided into a plurality of components in the width direction of the base  41 . 
     The invention is applicable to a gusset bag having the lateral portions  10 A and the bottom portion  10 B and may also be applicable to a gusset bag having only the bottom portion  10 B and a gusset bag without the bottom portion  10 B, and further to a bag having none of the lateral portion  10 A and the bottom portion  10 B. 
     The process for manufacturing the zipper-tape bag  1  is not necessarily the three-sided bag-making process, but may alternatively be a four-sided bag-making process, a pillow-bag making process, rotary-drum bag-making process or the like. 
     Though the zipper tape member  2 A cut out from the tape  2  is heat-sealed onto the film  11 A in some of the exemplary embodiments, the zipper tape member  2 A and the tape  2  may be heat-sealed onto the film  11 A without being cut. 
     The unsealing tab  17  may be formed at any timing as long as the film  11 A can be penetrated. For instance, the unsealing tab  17  may be formed after the tearing guide piece  30  and the male belt-shaped base  21 A are heat-sealed on the film  11 A and before the female belt-shaped base  22 A is heat-sealed on the film  11 A. The unsealing tab  17  may be formed at any desired timing depending on the bag-making method. 
     It should be noted that the thickness of the long-width female belt-shaped base  22 A is preferably increased to some degree (e.g. 100 μm or more) in order to keep the shaping blade from penetrating through the long-width female belt-shaped base  22 A even when the cutting depth of the shaping blade for forming the unsealing tab  17  has an error. 
     The tearing guide piece  30  is not necessarily a belt-shaped component but may be in a form of a string or the like as long as the tearing guide piece  30  is capable of tearing the film  11 A.