Bag-in-carton and pouring spout thereof

Abstract: A pouring spout (208) disposed on a flexible bag (203) contained within a carton (202), comprises a cylindrical portion (211) defining a through-hole (211b) which pierces through the inside and outside of the bag, a flange (212) disposed on an outer periphery of the cylindrical portion and connected to the inner surface of the bag and a passage member (215) connected to the flange and extending to the inside of the bag, the passage member and the flange being integrally formed. The passage member optimises dispensing of liquids.

Description: Technical Field The present invention relates to a back-in-carton (BIC) composed of a carton and an inner bag adhered thereto and to a pouring spout thereof. Related Art BICs have been used as vessels for containing liquid. Normally, a BIC is composed of a carton and an inner bag. The carton is formed in a rectangularly parallelopiped shape and has a lower surface, a upper surface, and four side surfaces, each of which is plane. The inner bag is adhered to the inner surfaces of the four side surfaces of the carton. The BICs are used for packaging liquid with a low viscosity (for example, juice, and liquor). When the content of the BIC is discharged, the same amount of air is charged therein. In consideration of low cost and security of the BIC, the inventors of the present invention studied the feasibility of the BIC for a liquid (such as ink) with a high viscosity. However, when a high-viscosity liquid was sucked and discharged from a BIC through its pouring spout, air could not be smoothly charged therein. Thus, as the content of the BIC was discharged, the inner bag should be deformed so as to decrease the volume thereof. Thus, in the conventional BIC where the inner bag was adhered to the inner four side surfaces of the carton, when the content was discharged, the inner bag was not deformed. Thus, in this construction, the BIC was not used for a vessel for a high-viscosity liquid. In addition, when the BIC is charged with a liquid which is adversely affected by air, the inner bag should be deformed. Thus, the conventional BIC could not be used likewise. WO 85/04383 and DE 38 21 919 disclose insert members for collapsible containers including a spout, an attachment section and an elongated body section having at least one continuous liquid passage along its whole length. This passage is in fluid communication with the liquid inside the container. When the walls of the container collapse the elongated body section of the insert member maintains a clear channel for a liquid flow from the interior of the container to the spout. In WO 85/04383 the elongated body section is formed as a separate element which is attached to the spout assembly. In DE 38 21 919 the elongated body section is a part of the spout assembly. In both the WO 85/04383 and DE 38 21 919 the elongated body section is pivotally connected with the spout assembly by a hinge so that it is turnable relative to the spout assembly. This design makes it difficult to maintain a specified channel for completely discharging the liquid if the container is collapsing in a undefined manner. It is the object of the invention to provide a bag-in-carton (BIC) and a pouring spout thereof which are suitable for packaging a high-viscosity liquid and reduce the remainder of the liquid after discharging the content of the BIC. This object is fulfilled by a pouring spout having the features disclosed in claim 1 and a bag-in-carton having the features disclosed in claim 6. Preferred embodiments are defined in the dependent subclaims. A bag-in-carton, comprises a closed box-shaped carton, a flexible inner bag disposed in the carton and adapted for containing a content, and a pouring spout disposed on the carton and piercing through the inner bag, wherein a portion of the inner bag on the side of the pouring spout is adhered and fixed to the inner surfaces of the carton, and wherein the area of the fixed portion of the inner bag is larger than the area of a movable portion of the inner bag other than the fixed portion. Preferably, the bag-in-carton, comprises a flat carton formed in a substantially rectangularly parallelopiped shape and having a pair of opposed wide surfaces, a flexible inner bag disposed on the inner surfaces of the carton and adapted for containing a content, and a pouring spout disposed on the carton and piercing through the inner bag, wherein the inner bag is adhered and fixed to the pair of wide surfaces. Preferably, the bag-in-carton, comprises a carton formed in a substantially rectangularly parallelopiped shape, a flexible inner bag disposed in the carton and adapted for containing a content, and a pouring spout disposed on the carton and piercing through the inner bag, wherein the inner bag is adhered and fixed to strip areas disposed on a pair of opposed surfaces of the carton, the areas having a predetermined width and extending along their center line of the surfaces. Preferably, a bag-in-carton, comprises a carton formed in a substantially rectangularly parallelopiped shape, a flexible inner bag disposed in the carton and adapted for containing a content, and a pouring spout disposed on the carton and piercing through the inner bag, wherein the inner bag is adhered and fixed to two adjacent surfaces of the carton, and wherein the pouring spout is disposed on one of the two surfaces. Preferably, a bag-in-carton, comprises a carton formed in a substantially rectangularly parallelopiped shape, a flexible inner bag disposed on the inner surfaces of the carton and adapted for containing a content, and a pouring spout disposed on the carton and piercing through the inner bag, wherein an inclined surface is formed between two adjacent surfaces of the carton, wherein the pouring spout is disposed on the inclined surface, wherein the inner bag is adhered and fixed to a portion on the pouring spout side of the inner surfaces of the carton, and wherein the area of the fixed portion of the inner bag is larger than the area of a movable portion other than the fixed portion. Preferably, a bag-in-carton, comprises a carton formed in a substantially rectangularly parallelopiped shape, a flexible inner bag disposed on the inner surfaces of the carton and adapted for containing a content, and a pouring spout disposed on the carton and piercing through the inner bag, wherein the pouring spout is disposed at an end portion of one surface of the carton, wherein a side flap is disposed in the vicinity of the pouring spout and on one surface of the carton adjacent to the surface on which the pouring spout is disposed, the side flap being rotatable about an end portion of the surface on which the pouring spout is disposed, and wherein the inner bag is adhered and fixed to the inner surface of the side flap. Preferably, a bag-in-carton, comprises a carton formed in a substantially rectangularly parallelopiped shape, and a pouring spout disposed on the carton and piercing through the inner bag, wherein the inner bag is adhered and fixed to a portion on the pouring spout side of the inner surfaces of the carton, wherein the area of the fixed portion of the inner bag is larger than the area of a movable portion other than the fixed portion, wherein the inner bag is formed by sealing both ends of a cylindrical film and bottom side portions of triangular flaps formed on both sides of both ends of the cylindrical film. A pouring spout is disposed on a flexible bag and comprises a cylindrical portion defining a through-hole which pierces through the inside and outside of the bag, a flange disposed on an outer periphery of the cylindrical portion and connected to the inner surface of the bag, and a passage member connected to the flange and extending to the inside of the bag, the passage member and the flange being integrally formed. The inner bag is adhered to the inner surfaces of the carton. Thus, the BIC can be inexpensively produced as with the conventional BIC. Since the movable portion of the inner bag which is disposed on the opposite side of the pouring spout is not adhered to the inner surfaces of the carton, as the content is discharged, the movable portion is deformed. Thus, the volume of the inner bag can be decreased. In addition, the content can be discharged from the inner bag without necessity of charging it with air. Finally, since the movable portion of the inner bag goes into the fixed portion which is adhered to the inner surfaces of the carton, almost all the content can be discharged from the inner bag. Since the movable portion of the inner bag is smaller than the half thereof, when the movable portion thereof goes into the fixed portion, the movable portion never comes in contact with the fixed portion, thereby preventing the content from being closed. Thus, almost all the content of the inner bag can be discharged. Since the inner pressure of the inner bag decreases, atmospheric pressure works in the direction that the inner bag is squashed. Since the inner bag is adhered to the opposed wide surfaces, an outer pressure works in the direction that the carton is squashed. Thus, the opposed wide surfaces are bent and approached to each other. Thus, the volume of the inner bag decreases. Therefore, without necessity of charging the inner bag with air, the content can be discharged. In addition, since the carton is flat and easily squashed, the volume of the inner bag and the remainder of the content can be much decreased. Although the fixed portions of the inner bag may be adhered and fixed to the strip areas on the inner surfaces of the carton, the portions which are perpendicular thereto are movable. Thus, the movable portions are inwardly deformed in the inner bag by the atmospheric pressure. Thus, the volume of the inner bag decreases. Therefore, without necessity of charging the inner bag with air, the content can be sucked and discharged. At this point, the inner bag is inwardly deformed from both the ends of the fixed portions fixed on the inner surfaces of the carton. Thus, the inner bag is not unstably deformed, thereby preventing the content from being closed in the inner bag. Consequently, almost all the content can be discharged from the inner bag. Therefore, the remainder of the content can be decreased. Although the portion of the inner bag on the pouring spout side may preferably be adhered and fixed to the two surfaces of the carton. The other portion of the inner bag is movable. As the content is sucked and discharged through the pouring spout, the movable portion is deformed. Thus, since the volume of the inner bag can be decreased, the content can be discharged without necessity of charging the inner bag with air. Last, the movable portion of the inner bag goes into the fixed portion adhered to the inner surfaces of the carton. Thus, almost all the content can be discharged. When the pouring spout is disposed in the vicinity of the edge line that the two surfaces corresponding to the inner surfaces to which the inner bag is adhered intersect each other, the pouring spout is present in the vicinity of the edge point of the fixed portion of the inner bag. Thus, when the content is discharged, the moving portion of the inner bag is moved to the pouring spout at last. Therefore, just after the content is discharged, the pouring spout is not blocked by the moving portion of the inner bag. Thus, almost all the content can be discharged. Since a half portion of the inner bag disposed on the opposite side of the pouring spout side preferably is freely movable, as the content is discharged (by a sucking means) from the pouring spout, this movable portion is deformed. Thus, since the volume of the inner bag can be decreased, without necessity of charging it with air, the content can be discharged. Last, the movable portion goes into the other portion of the inner bag which is fixed to the inner surfaces of the carton. Thus, almost all the content can be discharged. In addition, since the pouring spout is disposed on an inclined surface of the carton, when a plurality of the BICs are placed in a row or stacked for transportation, storage, or the like, their pouring spouts do not obstructively extrude. Thus, a large number of BICs can be compactly placed in a row. In addition, since the inner bag is preferably gradually moved along with the side flap, the inner bag never blocks the pouring spout. Thus, the content can be stably discharged. Consequently, in many BICs, the deviation of the remainder of the content thereof can be decreased. Preferably, the bottom sides of the triangular flaps formed on both the upper and lower ends of the inner bag are sealed, so that the content is not closed in the triangular flaps. Thus, the remainder of the content can be decreased. In addition, since the sealed portions serve to keep the inner bag in a substantially rectangularly parallelopiped shape. Thus, when the content is discharged, the second seal portions allow the inner bag to be equally deformed. When the pouring spout is mounted to the inner bag, the passage member can be aligned in the predetermined position. Thus, the mounting process can be simplified. When the BIC is used, the passage member is kept in the predetermined position of the hole of the pouring spout. Thus, when the content is discharged from the inner bag through the pouring spout, even if part of the inner bag is moved to the passage member, it can hold the inner bag, thereby securing the passage of the liquid to the hole of the cylindrical portion. Thus, the content can be smoothly discharged from the inner bag and the remainder thereof can be decreased. Brief Description of Drawings Fig. 1 is a schematic sectional view showing the BIC; Fig. 2A is a schematic plan view showing a carton blank for use in producing the BIC; Fig. 2B is a schematic plan view showing a film cylindrically adhered; Fig. 3A is a schematic plan view showing the carton blank and the cylindrically adhered film in a production step of the BIC; Fig. 3B is a schematic plan view showing the carton blank and the cylindrically adhered film in a production step of the BIC; Fig. 3C is a schematic plan view showing the carton blank and the cylindrically adhered film in a production step of the BIC; Fig. 4A is a schematic plan view showing an example of paste areas of the carton blank; Fig. 4B is a schematic plan view showing an example of paste areas of the carton blank; Fig. 5 is a schematic sectional view taken along a center plane in parallel with the longitudinal direction of the BIC; Fig. 6 is a schematic perspective view showing the BIC with the side of a pouring spout up; Fig. 7A is a schematic horizontal sectional view showing a BIC, which has been charged with its content, according to a further embodiment of the present invention; Fig. 7B is a schematic horizontal sectional view showing the BIC, whose content has been discharged; Fig. 8 is a schematic perspective view showing the BIC; Fig. 9 is a partial sectional side view showing a pouring spout for use with the BIC; Fig. 10 is a schematic bottom view showing the pouring spout; Fig. 11 is a schematic sectional view showing a cap for closing the pouring spout; Fig. 12A is a schematic plan view showing a carton blank for use in producing the BIC; Fig. 12B is a schematic plan view showing a film cylindrically adhered; Fig. 13A is a schematic plan view showing the carton blank and the cylindrically adhered film in a production step of the BIC; Fig. 13B is a schematic plan view showing the carton blank and the cylindrically adhered film in a production step of the BIC; Fig. 14 is a schematic perspective view showing the BIC in a production step thereof; Fig. 15A is a schematic horizontal sectional view showing a BIC and a pouring spout thereof, the BIC having been charged with its content, according to a further embodiment of the present invention; Fig. 15B is a schematic sectional view showing the BIC, whose content has been discharged; Fig. 16 is a schematic perspective view showing the BIC; Fig. 17 is a partial sectional side view showing the pouring spout; Fig. 18 is a schematic bottom view showing the pouring spout; Fig. 19 is a schematic sectional view showing a cap for closing the pouring spout; Fig. 20A is a schematic plan view showing a carton blank for use in producing the BIC; Fig. 20B is a schematic plan view showing a film cylindrically adhered; Fig. 21A is a schematic plan view showing the carton blank and the cylindrically adhered film in a production step of the BIC; Fig. 21B is a schematic plan view showing the carton blank and the cylindrically adhered film in the production step of the BIC; Fig. 22 is a schematic perspective view showing the BIC in the production step of the BIC; Fig. 23 is a schematic plan view showing a carton blank for use in producing a BIC according to a further embodiment of the present invention; Fig. 24 is a schematic plan view showing a carton blank according to a modification of the embodiment shown in Fig. 23; and Fig. 25 is a schematic perspective view of the BIC where the carton blank of Fig. 24 has been assembled. Preferred Embodiments Next, preferred embodiments of the present invention will be described. Fig. 1 is a perspective view showing the BIC. In Fig 1, reference numeral 1 is the BIC which is composed of a carton 2 and an inner bag. The carton 2 is an outer vessel. The inner bag contains a liquid such as an ink. The carton 2 is formed in a rectangularly parallelopiped shaped and has a lower surface 2a, a front surface 2b, side surfaces 2c and 2d, a rear surface 2e, and an upper surface 2f, each of which is flat. A pouring spout 5 is disposed at the lower end of the front surface 2b of the carton 2. The pouring spout 5 pierces through the inner bag. The pouring spout 5 is closed by a cap 6. The pouring spout 5 has a cylindrical portion which extends to the inside of the inner bag 3. A groove-shaped passage which allows the liquid to pass is formed on a side surface of the cylindrical portion. Since the passage is formed, even if the end of the cylindrical portion is blocked by the inner bag, the content can be discharged from the pouring spout 5 through the passage. The inner bag partially is adhered and fixed to the inner surfaces of the carton 2. In practice, a fixed portion of the inner bag, which is fixed to the carton 2, is a substantially rectangular portion on the pouring spout side, the rectangular portion being defined by a chain double-dashed line 8 shown in Fig 1. The other portion behind the chain double-dashed line 8 is a movable portion of the inner bag. The same chain double-dashed line 8 is defined both on the side surfaces 2c and 2d. The chain double-dashed line 8 is a boundary of the fixed portion and the movable portion of the inner bag. The length of the fixed portion on the pouring spout side is slightly larger than the length of the movable portion on the other side. In addition, the length between the lower end of the chain double-dashed line 8 and the lower end of the pouring spout side of the side surface 2d (2c) is slightly larger than the length between the upper end of the chain double-dashed line 8 and the upper end of the pouring spout side of the side surface 2d (2c) so that the movable portion of the inner bag can properly go into the fixed portion thereof. Provided that the distance between the chain double-dashed line 8 and the front surface 2b is equal to the half of the width of the inner bag or slightly larger than that, the path of the chain double-dashed line 8 is not limited to that as shown in the figure. Instead, the chain double-dashed line 8 may be in parallel with the front surface 2b. A portion in the vicinity of the chain double-dashed line 8 and at least a part of the fixed portion of the inner bag are adhered to the front surface2b, and the side surfaces 2c and 2d. Thus, the fixed portion of the inner bag is fixed to the inner surfaces of the carton 2. Therefore, the area of the fixed portion does not always accord with the area where the inner bag is adhered to the inner surfaces of the carton 2. In Fig 1, reference 9 represents paste areas at which the inner bag is adhered to the inner surfaces of the carton 2. Thus, the area of the inner bag which is slightly larger than the area on the pouring spout side is fixed to the inner surfaces of the carton 2. The other area is not fixed to the inner surfaces of the carton 2. Thus, this area is a movable portion of the inner bag. Next, the production method of the bag-in-carton (BIC) 1 in the above-described construction will be described. A carton blank 2' as shown in Fig. 2A is prepared. The inner bag 3 is adhered to a area defined by two chain double-dashed lines 8 on the inner surfaces of the carton blank 2'. A paste (for example, an emulsion) 9 is adhered to panels 2b' and 2c' of the carton blank 2' (which accord with the front surface 2b and the side surface 2c of the carton 2). The paste is applied while the carton blank 2' is being conveyed in the array direction of the figure. Thus, the paste 9 is straightly applied as shown in the figure. It is difficult to precisely apply the paste 9 along the inclined chain double-dashed lines 8. In this embodiment, the paste 9 is applied to short areas in the vicinity of the chain double-dashed lines 8 along with the straight area. As shown in Fig. 2B, a film is formed in a cylindrical shape (both the longitudinal ends of the film are sealed). The cylindrically adhered film is cut in a predetermined length. (In a later step, the upper and lower ends of the cylindrically adhered film 3' will be sealed so as to form the inner bag.) The cylindrically adhered film 3' is adhered to the inner surfaces of the carton blank 2' as shown in Fig. 3A. The cylindrically adhered film 3' is not limited to that shown in Fig. 3B. The cylindrically adhered film 3' may be formed by layering two films and sealing both the ends thereof. Next, as shown in Fig. 3B, the paste 9 is applied to a panel 2d' of the carton blank 2' (according to the side surface 2d of the carton 2). In addition, the paste 9 is applied to the rear surface of a paste-up margin 2g'. As shown in Fig. 3C, the panels 2d' and 2e' are folded and adhered to each other so as to adhere them to the cylindrically adhered film 3'. Thus, a flat BIC 1' which has not been assembled is formed. Next, the flat BIC 1' is conveyed to an assembling and charging step. In this step, the BIC 1' is shaped in a square pillar shape. A portion for mounting the pouring spout 5 is blanked and then the pouring spout 5 is mounted thereon. The lower end of the cylindrically adhered film 3' is sealed and then the lower portion of the carton blank 2' is assembled. The upper end of the cylindrically adhered film 3' is sealed and then the upper portion of the carton blank 2' is assembled. Thus, the inner bag has been contained in the carton 2 and the BIC 1 has been assembled. Since these production steps can be performed by the conventional BIC production technique, for the sake of the simplicity, the description of the production facility and so forth are omitted. The inner bag is deaerated from the pouring spout 5 and then charged with the content 4 such as an ink. When the BIC 1 which has been charged with the content is used, it is set to a printer or the like in its upright style. The pouring spout 5 is connected to a sucking device (not shown) so as to discharge the content from the pouring spout 5. At this time, since the movable portion of the inner bag which is disposed on the opposite side of the pouring spout 5 is not adhered to the inner surfaces of the carton 2, as the content is discharged, the movable portion is deformed. Thus, the content is discharged from the inner bag without necessity of charging it with air. Finally, since the movable portion of the inner bag goes into the fixed portion which is adhered to the inner surfaces of the carton, almost all the content can be discharged from the inner bag. Since the movable portion of the inner bag is smaller than the half thereof, when the movable portion thereof goes into the fixed portion, the movable portion never comes in contact with the fixed portion, thereby preventing the content from being closed. Thus, almost all the content of the inner bag can be discharged. In particular, as shown in Fig 1, when the boundary of the movable portion and fixed portion of the inner bag (defined by the chain double-dashed line 8) is slightly inclined so that the length between the upper end of the boundary and the upper end of the front surface 2b is slightly shorter than the length between the lower end of the boundary and the lower end of the front surface 2b, just after the content is discharged from the inner bag, the movable portion of the inner bag never moves to the pouring spout 5, thereby preventing the movable portion from blocking the passage of the content. Thus, almost all the content can be smoothly discharged from the inner bag. The lower end of the boundary is preferably as apart from the pouring sport 5 as possible so as to prevent the movable portion of the inner bag from blocking the pouring spout 5. However, since the content tends to reside at the bottom of the inner bag, the area of the bottom of the inner bag is preferably as small as possible. From this point of view, the position of the lower end of the boundary is preferably as close to the pouring spout 5 as possible. In the above-described embodiment, as shown in Fig. 3, the inner bag was adhered to the area defined by the two chain double-dashed lines 8 on the inner surfaces of the carton blank 2'. To adhere the inner bag to this area, the paste 9 was applied in a straight line pattern (shown in Figs. 2A, 2B, 3A, 3B, and 3C). However, the areas to which the paste 9 is applied are not limited to this pattern shown in these figures. Instead, as shown in Fig. 4A, a paste 9a may be applied in an intermittent line pattern. In addition, a paste 9b may be applied in a spot pattern. In the above-described embodiment, the pouring spout 5 had the cylindrical portion 5a which extends to the inside of the inner bag. In addition, a passage member which secures the passage of the content upon the injection of the movable portion of the inner bag into the fixed portion thereof is disposed at the bottom of the inner bag. In the above-described embodiment and the modifications thereof, the BIC was set to a machine in an upright style and the content was discharged from the pouring spout disposed at the lower end on the front surface of the BIC. However, the discharging of the content is not limited to such a manner. Instead, the discharging method can be changed corresponding to the machine to which the BIC is set. For example, the front surface of the BIC may be placed down so that the pouring spout faces downward. In addition, in the above-described embodiment and the modifications thereof, the upper surface of the carton was flat. However, the upper surface of the carton is not always flat. Instead, the upper surface of the carton may be formed in another shape. As described above, the cylindrically adhered film which is the inner bag is adhered to the carton blank. The carton blank is adhered in a box shape. The upper and lower ends of the cylindrically adhered film are sealed. In addition, the lower portion and the upper portion of the carton blank are assembled. Thus, the BIC has been formed. Therefore, the BIC can be inexpensively produced as with the conventional BIC. Moreover, since the BIC is formed of two layers of the inner box and the carton, the content thereof can be securely protected. Moreover, the portion which is slightly larger than the half of the inner bag is a fixed portion which is fixed to the inner surfaces of the carton, while the other portion thereof is a movable portion. Thus, while the movable portion of the inner bag is injected into the fixed portion, almost all the content can be discharged from the inner bag through the pouring spout. Thus, the BIC can be effectively used for a carton for a high-viscosity solution and a solution which is adversely affected by air. Fig. 5 is a schematic sectional view taken along a center plane in parallel with the longitudinal direction of the BIC. Fig. 6 is a schematic perspective view of the BIC. In Fig 6, reference numeral 121 is the BIC. The BIC 121 is constructed of a carton 122 and a flexible inner bag 123 contained therein. The carton 122 forms an outer vessel. The inner bag 123 contains a content 124 which is a liquid such as an ink. The carton 122 is formed in a rectangularly parallelopiped shape and has a pair of opposed surfaces 122a and 122b, a pair of opposed side surfaces 122c and 122d, and a pair of opposed end surfaces 122e and 122f. A pouring spout 125 is disposed at a center portion in the lateral direction of the surface 122a. The pouring spout 125 pierces through the inner bag 123. The pouring spout 125 is closed by a cap 126. The pouring spout 125 has a flange and a protruding portion. The flange is connected to the inner bag 123. The protruding portion extends to the inside of the inner bag 123. A passage which allows the liquid to pass is formed between the flange and the protruding portion. Thus, as will be described later, when the surface 122b is approached to the pouring spout 125 as the content 124 is discharged, the protruding portion holds the surface 122b, thereby preventing the passage of the pouring spout 125 from being blocked. In addition, the flange of the pouring spout 125 is integrally connected to an H-letter-shaped passage member 125d. The passage member 125d is disposed in the inner bag 123 in the longitudinal direction of the carton 122. When the content 124 is discharged and then the movable portion of the inner bag 123 blocks the passage of the pouring spout 125, the passage member 125d holds the movable portion of the inner bag 123 so as to secure the passage of the pouring spout 125. The inner bag 123 is partially adhered and fixed to the opposed surfaces 122a and 122b of the carton 122. The inner bag 123 is fixed at strip areas 127a and 127b which extend along the center line in the longitudinal direction of the surfaces 122a and 122b. The strip areas 127a and 127b are shown by hatched lines of Fig. 16. Hereinafter, portions 123a and 123b of the inner bag 123 which are fixed at the strip areas 127a and 127b are referred to as fixed portions. The inner bag 123 may be fixed at the strip areas 127a and 127b by adhering the inner bag 123 to the strip areas 127a and 127b partially not fully. The widths of the fixed portions of the inner bag 123 (namely, the strip areas 127a and 127b) are approximately the half of the width of the carton 102. The BIC 121 is set to a machine such as a printer in such a way that the pouring spout 125 is placed down. The pouring spout 125 is connected to a connector (not shown) of a sucking device disposed on the machine side. The content is discharged through the pouring spout 125. As the content 124 is discharged, the inner pressure of the inner bag 123 decreases. Thus, atmospheric pressure works in the inner bag 123 in the direction that it is squashed. Although the fixed portions and of the inner bag 123 are adhered and fixed to the strip areas 127a and 127b on the inner surfaces of the carton 122, the portions which are perpendicular thereto are movable. Thus, the movable portions are inwardly deformed in the inner bag 123 by the atmospheric pressure. Thus, the volume of the inner bag 123 decreases. Therefore, without necessity of charging the inner bag 123 with air, the content 124 can be sucked and discharged. At this point the inner bag 123 is inwardly deformed from both the ends of the fixed portions fixed on the inner surfaces of the carton 122. Thus, the inner bag 124 is not unstably deformed, thereby preventing the content from being closed in the inner bag 124. Consequently, almost all the content can be discharged from the inner bag 124. In this modification, the strip areas 127a and 127b to which the inner bag 123 is fixed are disposed along the center line extending in the longitudinal direction of the surfaces 122a and 122b of the carton. However, this modification is not limited to this construction. Instead, the inner bag 123 may be fixed in strip areas along the center line extending in the lateral direction of the surfaces 122a and 122b of the carton. The position of the pouring spout 125 is not limited to the surface 122a. Instead, the pouring spout 125 may be disposed on any other surface. In this case, the pouring spout 125 is preferably disposed on one of the strip areas. In the above-description, when the content is discharged, the BIC 101 (121) is set to the machine in such a way that the pouring spout is placed down. However, when the content is discharged from the BIC 101 (121), the pouring spout may be disposed in any position corresponding to the machine to which the BIC 101 (121) is set. As described above the cylindrically adhered film which forms the inner bag is adhered to the carton blank. The carton blank is adhered in a box shape. Both the ends of the cylindrically adhered film are sealed. Both the ends of the carton blank are assembled. Thus, the BIC is formed. Consequently, the BIC according to this embodiment and the modification thereof can be inexpensively produced as with the conventional BIC. In addition, since the BIC is dually formed of the inner bag and the carton, the content can be securely protected. However, in the second embodiment, since the flat carton is formed in such a way that most areas of the opposed wide surfaces are adhered to the inner bag, as the content is discharged through the pouring spout, the inner bag is stably deformed as the wide surfaces are deformed. Thus, the volume of the inner bag decreases. Consequently, without necessity of charging the inner bag with air, the content can be sucked and discharged. Moreover, since the inner bag is stably deformed, the volume of the inner bag and thereby the remainder of the content can be much decreased. Thus, the BIC according to this embodiment can be effectively used for a packaging carton for a high-viscosity liquid and a liquid which is adversely affected by air. Moreover, since the BIC is dually formed of the inner bag and the carton, the content can be securely protected. Furthermore, in this modification, the inner bag is fixed to the strip areas extending along the center line of each of the opposed surfaces. Thus, when the content is discharged from the inner bag through the pouring spout, the movable portions perpendicular to the fixed portions fixed to the strip areas are inwardly and stably deformed. Thus, since the volume of the inner bag decreases, without necessity of charging the inner bag with air, the content can be sucked and discharged. In addition, since the inner bag is stably deformed, the volume of the inner bag and thereby the remainder of the content can be much decreased. Thus, the BIC according to the modification can be effectively used for a packaging carton for a high-viscosity liquid and a liquid which is adversely affected by air. Next, a further embodiment of the present invention will be described. Figs. 7A and 7B are schematic sectional views showing a back-in-carton (BIC) according to a further embodiment of the present invention. Fig. 7A shows the state of the BIC which has been charged with its content, whereas Fig. 7B shows the state of the BIC whose content has been discharged. Fig. 8 is a schematic perspective view showing the BIC. In Figs. 7A, 7B, and 8, reference numeral 201 is the BIC according to the third embodiment. The BIC 201 is composed of a carton 202 and a flexible inner bag 203 contained therein. The carton 202 forms an outer vessel. The inner bag 203 contains a content 204 which is a liquid such as an ink. The carton 202 is rectangularly parallelopiped and has six rectangular surfaces which are four side surfaces 202a, 202b, 202c, 202d and two end surfaces 202e and 202f, each of which is plane. The inner bag 203 is partially adhered and fixed to the inner surfaces of the carton 202. The fixed portions of the inner bag 203 are portions according to the two adjacent side surfaces 202b and 202c of the carton 202. However, it is not necessary to fully adhere the inner bag 203 to the side surfaces 202b and 202c. Instead, the inner bag 203 is partially adhered to the side surfaces 202b and 202c in such a way that almost all the areas of the inner bag 203 corresponding to the side surfaces 202b and 20c are not moved. In this embodiment, the inner bag 203 is adhered to areas shown by hatched lines of Fig. 18. The areas of the inner bag 203 according to the other surfaces 202a, 202d, 202e, and 202f of the carton 202 are not adhered to the inner surfaces of the carton 202. Now, assume that the inner bag 203 is divided by a diagonal line X-X into a first portion on the side surfaces 202b and 202c and a second portion on the side surfaces 202a and 202d. The first portion on the side surfaces 202b and 202c becomes a fixed portion which is fixed to the inner surfaces of the carton 202, whereas the second portion on the side surfaces 202a and 202b becomes a movable portion. Areas of the inner bag 203 according to the end surfaces 202e and 202f on the side of the first portion may be adhered thereto when necessary. A pouring spout 208 is disposed on the side surface 202b. The pouring spout 208 pierces through the inner bag 203. The pouring spout 208 is closed by a cap 209. In this embodiment, the position of the pouring spout 208 on the side surface 202b is not limited. However, the pouring spout 208 should be disposed at a position close to the lower end of the side surface 202b and in the vicinity of the edge line where the side surfaces 202b and 202c intersect to each other. As shown in Figs. 9 and 10, the pouring spout 208 has a cylindrical portion 211 and a flange 212. The cylindrical portion 211 has a thread portion 211a and a through-hole 211b. The thread portion 211a is formed on the outer periphery of the cylindrical portion 211. The through-hole 211b pierces through the cylindrical portion 211a. The flange 212 is formed on the outer periphery of the cylindrical portion 211 and adapted to mount the inner bag. The cylindrical portion 211 is formed so that it is fitted to a connector of a machine such as a printer (not shown). The cylindrical portion 211 has a ring-shaped groove 211c. This groove 211c is formed so as to reduce the wall thickness of the cylindrical portion 211. The groove 211c may be omitted. The pouring spout 208 also has a cylindrical extruding portion 213 which surrounds the through-hole 211b and extends to the inside of the inner bag 203 beyond the flange 212. A plurality of groove-shaped passages 214 which allow the liquid to pass are formed on the side surfaces of the protruding portion 213. Since the protruding portion 213 having the passages 214 is provided, when the content is discharged, even if the movable portion of the inner bag 203 is excessively approached to the pouring spout 208, the end of the protruding portion 213 can hold the inner bag 203, thereby securing the flow of the content to the hole 211b through the passages 214. The flange 212 of the pouring spout 208 has a thin H-letter-shaped passage member 215 which is integrally formed therewith and extends in the direction thereof. The passage member 215 has a first flat plate member 215a, a rib 215b, and a second flat plate member 215c. The first flat plate member 215a is disposed on a plane extended from the flange 212. The rib 215b is disposed nearly at the center of the first flat plate member 215a and perpendicular thereto. The second flat plate member 215c is disposed at the end of the rib 215b and in parallel with the first flat plate member 215a. As shown in Figs. 7A, 7B, and 8, the cylindrical portion 211 of the pouring spout 208 protrudes from the hole formed on the side surface 202b of the carton 202. The flange 212 is adhered to the inner surface of the inner bag 203 adhered on the inner surfaces of the carton 202. Thus, when the pouring spout 208 is mounted, the passage member 215 can be aligned along the side surface 202b of the carton 202. As described above, since the passage member 215 is formed substantially in a H-letter shape, as the content is discharged from the inner bag 203, the moving portion of the inner bag 203 is moved to the side surface 202b. At this point, the second flat plate member 215c of the passage member 215 can hold the inner bag 203, thereby securing the passage of the pouring spout 208 to the hole 211b. In Figs. 9 and 10, the pouring spout 208 has protrusions 216 which are spaced so as to secure the passage from the passage member 215 to the hole 211b. In this embodiment, the pouring spout 208 has one passage member 215. However, when necessary, a plurality of passage members may be disposed. In this embodiment, the construction of the cap 209 is not limited to that shown in Fig. 11. Instead, a cap having a plug which closes the hole 211b of the pouring spout 208 may be used. Normally, the pouring spout 208 and the cap 209 can be formed of resin. Next, the production method of the BIC 201 will be described. As shown in Fig. 12A, a carton blank 202' where a card board has been blanked in a predetermined shape is prepared so as to form the carton. In addition, a cylindrically adhered film 203' is prepared. The cylindrically adhered film 203' is formed by sealing both the ends of a film and then by cutting it in a predetermined length. (In the later step, the upper and lower ends of the cylindrically adhered film 203' will be sealed so as to form the inner bag.) The cylindrically adhered film 203' is not limited to that shown in Fig. 12A. The cylindrically adhered film 203' may be formed by layering two films and sealing both the ends thereof. Next, a paste (for example, an emulsion) 220 is applied to panels 202a' and 202b' of the carton blank 202' (according to the surfaces 202a and 202b of the carton 202). Since the paste 220 is applied while the carton blank 202' is being conveyed in the arrow direction of the figure, the paste 220 is applied in a straight line pattern as shown in Fig. 12A. In addition, the paste 220 is applied to the rear surface of a paste-up margin 202g'. The paste positions and paste pattern are not limited to those shown in the figure. Instead, they may be properly modified. For example, the paste 220 may be applied in a spot pattern. Next, the cylindrically adhered film 203' is adhered to the carton blank 202' by the paste 220. The adhered state of the cylindrically adhered film 203' to the carton blank 202' is shown in Fig. 13A. Next, as shown in Fig. 13B, the panels 202b' and 202d' of the carton blank 202' (according to the surfaces 202b and 202d of the carton 202) are folded and then adhered to each other. Thus, a flat BIC 201' which has not been assembled is formed. The flat BIC 201' is conveyed to an assembling and charging step. In this step, as shown in Fig. 14, the BIC 201' is shaped in a square pillar shape and then blanked for the pouring spout. The pouring spout 208 is mounted on the BIC 201'. The cylindrical portion 211 of the pouring spout 208 is inserted into the hole for the pouring spout from the inside of the cylindrically adhered film 203'. The flange 212 is adhered to the inner surface of the flange 212 by an ultrasonic sealing process or the like. After the pouring spout 208 is mounted, the lower end of the cylindrically adhered film 203' is sealed. The lower end of the carton blank 202' is assembled. The upper end of the cylindrically adhered film 203' is sealed and then the upper end of the carton blank 202' is assembled. Thus, as shown in Fig. 8, the BIC 201 where the inner bag 203 has been contained in the carton 202 has been assembled. Since these steps are performed by the conventional BIC producing technique, for the sake of the simplicity, the production facility and so forth for the BIC 201 are omitted. Last, the inner bag 203 is deaerated through the pouring spout 208 and then the BIC 201 is charged with the content 204 such as an ink. Thus, the state as shown in Fig. 7A takes place. When the BIC 201 which has been charged with the content 204 is used, as shown in Fig. 8, the BIC 201 is set to a machine (such as a printer) in a nearly upright style. A connector of a sucking device of the machine (not shown) is connected to the pouring spout 208 so as to discharge the content 204. At this point, since the portion of the inner bag 203 surrounded by the diagonal line X-X and the side surfaces 202a and 202d is the movable portion which is not fixed to the inner surfaces of the carton 202, as the content is discharged, the moving portion is deformed as shown by the chain double-dashed lines 222a, 222b, 222c, etc. of Fig. 7B. Thus, without necessary of charging the inner bag with air, the content is discharged. Last, the movable portion of the inner bag 203 is injected into the fixed portion thereof. Thus, almost all the content can be discharged from the inner bag 203. Since the volume of the movable portion of the inner bag 203 is almost the half of the entire volume of the inner bag 203, when the movable portion goes into the fixed portion, just after the content is discharged, the movable portion almost never comes in contact with the fixed portion in the vicinity of the pouring spout 208, thereby preventing the content from being closed. In addition, since the pouring spout 208 is disposed in the vicinity of the edge of the fixed portion of the inner bag 203, the movable portion of the inner bag 203 is moved to the position of the pouring spout 208 at last. Thus, almost all the content can be discharged from the inner bag 203. In addition, since the pouring spout 208 according to this embodiment has the plurality of cylindrical protruding portions 213 which extends to the inside of the inner bag 203 and is integrally formed with the passage member 215, the protruding portions 213 and the passage member 215 can hold the inner bag 203 which is moved to the pouring spout 208 as the content is discharged, thereby securing the passage of the liquid. Thus, almost all the content can be much smoothly discharged. In the above-described embodiment, the BIC 201 was set to a machine in an upright style and the content was discharged from the pouring spout 208 disposed at the lower end on the front surface 202b. However, the discharging of the content is not limited to such a manner. Instead, the discharging method can be changed corresponding to the machine to which the BIC 201 is set. For example, the side surface 202b having the pouring spout 208 may be placed down so that the pouring spout 208 faces downward. In this case, it is not necessary to disposed the pouring spout 208 at the lower end of the side surface 202b as shown in the figure. In this embodiment, the pouring spout 208 and the passage member 215 were integrally formed. However, the passage member 215 may be independently formed. Thus, the pouring spout 208 and the passage member 215 may be independently disposed to the inner bag. In addition, when the length of the side surface 202b on which the pouring spout 208 is mounted not so long, the passage member 215 may be omitted. As described above, in the back-in-carton (BIC), the cylindrically adhered film which forms the inner bag is adhered to the carton blank. The carton blank is adhered in a box shape. Both the upper and lower ends of the cylindrically adhered film are sealed. Both the lower and upper ends of the carton blank are assembled. Thus, the BIC is formed. Consequently, the BIC according to the third embodiment can be inexpensively produced as with the conventional BIC. In addition, since the BIC is dually formed of the inner bag and the carton, the content can be securely protected. In addition, in this embodiment, since the inner bag in the carton is adhered and fixed to two adjacent surfaces of the carton and the pouring spout is mounted on one of these surfaces, the portion of the inner bag disposed on the pouring spout side is a fixed portion which is fixed to the inner surfaces of the carton. On the other hand, the other portion of the inner bag is a movable portion. Thus, while the movable portion goes into the fixed portion, almost all the content can be discharged from the pouring spout. Consequently, the BIC according to the modification can be effectively used for a packaging carton for a high-viscosity liquid and a liquid which is adversely affected by air. Next, a further embodiment of the present invention will be described. Figs. 15A and 15B are schematic sectional views showing a back-in-carton (BIC) according to a further embodiment of the present invention. Fig. 15A shows the state of the BIC which has been charged with its content, whereas Fig. 15B shows the state of the BIC whose content has been discharged. Fig. 16 is a schematic perspective view showing the BIC. The BIC 501 is composed of a carton 502 and a flexible inner bag 503 contained therein. The carton 502 forms an outer vessel. The inner bag 503 contains a content 504 which is a liquid such as an ink. The carton 502 is rectangularly parallelopiped and has six rectangular surfaces which are four side surfaces 502a, 502b, 502c, 502d and two end surfaces 502e and 502f, each of which is plane. The inner bag 503 is partially adhered and fixed to the inner surfaces of the carton 502. The fixed portions of the inner bag 503 are portions according to the two adjacent side surfaces 502b and 502c of the carton 502. However, it is not necessary to fully adhere the inner bag 503 to the side surfaces 502b and 502c. Instead, the inner bag 503 is partially adhered to the side surfaces 502b and 502c in such a way that almost all the areas of the inner bag 503 corresponding to the side surfaces 502b and 502c are not moved. In this embodiment, the inner bag 503 is adhered to areas shown by hatched lines of Fig. 36. The areas of the inner bag 503 according to the other surfaces 502a, 502d, 502e, and 502f of the carton 502 are not adhered to the inner surfaces of the carton 502. Now, assume that the inner bag 503 is divided by a diagonal line X - X into a first portion on the side surfaces 502b and 502c and a second portion on the side surfaces 502a and 502d. The first portion on the side surfaces 502b and 502c becomes a fixed portion which is fixed to the inner surfaces of the carton 502, whereas the second portion on the side surfaces 502a and 502b becomes a movable portion. Areas of the inner bag 503 according to the end surfaces 502e and 502f on the side of the first portion may be adhered thereto when necessary. A pouring spout 508 is disposed on the side surface 502b. The pouring spout 508 pierces through the inner bag 503. The pouring spout 508 is closed by a cap 509. In this embodiment, the position of the pouring spout 508 on the side surface 502b is not limited. However, the pouring spout 508 should be disposed at a position close to the lower end of the side surface 502b and in the vicinity of the edge line where the side surfaces 502b and 502c intersect to each other. As shown in Figs. 17 and 18, the pouring spout 508 has a cylindrical portion 511 and a flange 512. The cylindrical portion 511 has a thread portion 511a and a through-hole 511b. The thread portion 511a is formed on the outer periphery of the cylindrical portion 511. The through-hole 511b pierces through the cylindrical portion 511a. The flange 512 is formed on the outer periphery of the cylindrical portion 511 and adapted to mount the inner bag. The cylindrical portion 511 is formed so that it is fitted to a connector of a machine such as a printer (not shown). The cylindrical portion 511 has a ring- shaped groove 511c. This groove 511c is formed so as to reduce the wall thickness of the cylindrical portion 511. The groove 511c may be omitted. The pouring spout 508 also has a cylindrical extruding portion 513 which surrounds the through- hole 511b and extends to the inside of the inner bag 503 beyond the flange 512. A plurality of groove-shaped passages 514 which allow the liquid to pass are formed on the side surfaces of the protruding portion 513. Since the protruding portion 513 having the passages 514 is provided, when the content is discharged, even if the movable portion of the inner bag 503 is excessively approached to the pouring spout 508, the end of the protruding portion 513 can hold the inner bag 503, thereby securing the flow of the content to the hole 511b through the passages 514. The flange 512 of the pouring spout 508 has a thin H-letter-shaped passage member 515 which is integrally formed therewith and extends in the direction thereof. The passage member 515 has a first flat plate member 515a, a rib 515b, and a second flat plate member 515c. The first flat plate member 515a is disposed on a plane extended from the flange 512. The rib 515b is disposed nearly at the center of the first flat plate member 515a and perpendicular thereto. The second flat plate member 515c is disposed at the end of the rib 515b and in parallel with the first flat plate member 515a. A passage passing from the inner bag 503 to the hole 511b of the cylindrical portion 511 is formed between the first flat plate member 515a and the second flat plate member 515c. As shown in Figs. 15A, 15B, and 16, the cylindrical portion 511 of the pouring spout 508 protrudes from the hole formed on the side surface 502b of the carton 502. The flange 512 is adhered to the inner surface of the inner bag 503 adhered on the inner surfaces of the carton 502. Thus, when the pouring spout 508 is mounted, the passage member 515 can be aligned along the side surface 502b of the carton 502. As described above, since the passage member 515 is formed substantially in a H-letter shape, as the content is discharged from the inner bag 503, the moving portion of the inner bag 503 is moved to the side surface 502b. At this point, the second flat plate member 515c of the passage member 515 can hold the inner bag 503, thereby securing the passage of the pouring spout 508 to the hole 511b. In Figs. 17 and 18, the pouring spout 508 has protrusions 516 which are spaced so as to secure the passage from the passage member 515 to the hole 511b. In this embodiment, the pouring spout 508 has one passage member 515. However, when necessary, a plurality of passage members may be disposed. In this embodiment, the construction of the cap 509 is not limited to that shown in Fig. 11. Instead, a cap having a plug which closes the hole 511b of the pouring spout 508 may be used. Normally, the pouring spout 508 and the cap 509 can be formed of resin. Next, the production method of the BIC 501 will be described. As shown in Figs. 20A and 20B, a carton blank 502' where a card board has been blanked in a predetermined shape is prepared so as to form the carton. In addition, a cylindrically adhered film 503' is prepared. The cylindrically adhered film 503' is formed by sealing both the ends of a film and then by cutting it in a predetermined length. (In the later step, the upper and lower ends of the cylindrically adhered film 503' will be sealed so as to form the inner bag.) The cylindrically adhered film 503' is not limited to that shown in Fig. 20B. The cylindrically adhered film 503' may be formed by layering two films and sealing both the ends thereof. Next, a paste (for example, an emulsion) 520 is applied to panels 502b' and 502c' of the carton blank 502' (according to the surfaces 502b and 502c of the carton 502). Since the paste 520 is applied while the carton blank 502' is being conveyed in the arrow direction of the figure, the paste 520 is applied in a straight line pattern as shown in Fig. 20A. In addition, the paste 520 is applied to the rear surface of a paste-up margin 502g'. Next, the cylindrically adhered film 503' is adhered to the carton blank 502' by the paste 520. The adhered state of the cylindrically adhered film 503' to the carton blank 502' is shown in Fig. 21A. Next, as shown in Fig. 41B, the panels 502a' and 502d' of the carton blank 502' (according to the surfaces 502a and 502d of the carton 502) are folded and then adhered to each other. Thus, a flat BIC 501' which has not been assembled is formed. The flat BIC 501' is conveyed to an assembling and charging step. In this step, as shown in Fig. 22, the BIC 501' is shaped in a square pillar shape and then blanked for the pouring spout. The pouring spout 508 is mounted on the BIC 501'. The cylindrical portion 511 of the pouring spout 508 is inserted into the hole for the pouring spout from the inside of the cylindrically adhered film 503'. The flange 512 is adhered to the inner surface of the flange 512 by an ultrasonic sealing process or the like. After the pouring spout 508 is mounted, the lower end of the cylindrically adhered film 503' is sealed. The lower end of the carton blank 502' is assembled. The upper end of the cylindrically adhered film 503' is sealed and then the upper end of the carton blank 502' is assembled. Thus, as shown in Fig. 36, the BIC 501 where the inner bag 503 has been contained in the carton 502 has been assembled. Since these steps are performed by the conventional BIC producing technique, for the sake of the simplicity, the production facility and so forth for the BIC 501 are omitted. Last, the inner bag 503 is deaerated through the pouring spout 508 and then the BIC 501 is charged with the content 504 such as an ink. Thus, the state as shown in Fig. 15A takes place. When the BIC 501 which has been charged with the content 504 is used, as shown in Fig. 16, the BIC 501 is set to a machine (such as a printer) in a nearly upright style. A connector of a sucking device of the machine (not shown) is connected to the pouring spout 508 so as to discharge the content 504. At this point, since the portion of the inner bag 503 surrounded by the diagonal line X-X and the side surfaces 502a and 502d is the movable portion which is not fixed to the inner surfaces of the carton 502, as the content is discharged, the moving portion is deformed as shown by the chain double-dashed lines 522a, 522b, 522c, etc. of Fig. 15B. Thus, without necessary of charging the inner bag with air, the content is discharged. Last, the movable portion of the inner bag 503 is injected into the fixed portion thereof. Thus, almost all the content can be discharged from the inner bag 503. Since the volume of the movable portion of the inner bag 503 is almost the half of all the volume of the inner bag 503, when the movable portion is injected into the fixed portion, just after the content is discharged, the movable portion almost never comes in contact with the fixed portion in the vicinity of the pouring spout 508, thereby preventing the content from being closed. In addition, since the pouring spout 508 is disposed in the vicinity of the edge of the fixed portion of the inner bag 503, the movable portion of the inner bag 503 is moved to the position of the pouring spout 508 at last. Thus, almost all the content can be discharged from the inner bag 503. In addition, since the pouring spout 508 according to this embodiment has the plurality of cylindrical protruding portions 513 which extends to the inside of the inner bag 503 and is integrally formed with the passage member 515, the protruding portions 513 and the passage member 515 can hold the inner bag 503 which is moved to the pouring spout 508 as the content is discharged, thereby securing the passage of the liquid. Thus, almost all the content can be much smoothly discharged. In the above-described embodiment, the BIC 501 was set to a machine in an upright style and the content was discharged from the pouring spout 508 disposed at the lower end on the front surface 502b. However, the discharging of the content is not limited to such a manner. Instead, the discharging method can be changed corresponding to the machine to which the BIC 501 is set. For example, the side surface 502b having the pouring spout 508 may be placed down so that the pouring spout 508 faces downward. In this case, it is not necessary to disposed the pouring spout 508 at the lower end of the side surface 502b as shown in the figure. In the above-mentioned embodiment, the pouring spout 508 was used in the BIC 501 where the inner bag 503 was adhered to the side surfaces 502b and 502c of the carton 502 was described. However, the construction of the BIC to which the pouring spout is mounted is not limited to that described in the embodiment. Instead, the construction of the BIC may be changed. In addition, the pouring spout 508 may be used for a BIB rather than the BIC 501. As described above, since the pouring spout according to this embodiment is integrally formed along with the passage member, they can be formed by one forming process. Thus, unlike with the conventional production method, the production cost can be reduced. In addition, when the pouring spout is mounted on the inner bag, the passage member can be aligned in the predetermined position. Thus, the mounting process can be simplified. When the BIC is used, the passage member is kept in the predetermined position of the hole of the pouring spout. Therefore, when the content is discharged from the inner bag through the pouring spout, even if part of the inner bag is moved to the passage member, it can hold the inner bag, thereby securing the passage of the liquid to the hole of the cylindrical portion. Thus, the content can be smoothly discharged from the inner bag and the remainder thereof can be decreased. Next, with reference to Figs. 23 to 25, a further embodiment of the present invention will be described. As shown in Fig. 23, a bag-in-carton (BIC) is produced in the following manner. First, a carton blank 602' is prepared. A paste (for example, an emulsion) 609 is applied to the upper portions of panels 602a', 602b', 602c', 602d', and 602g'. A cylindrically adhered film 3' (see Fig. 2B) is adhered to the paste areas of the carton blank 602'. In this case, the carton blank 602' is a box-shaped carton 2 of the BIC. The cylindrically adhered film 3' is a flexible inner bag of the BIC. In Fig. 23, reference numeral 610 depicts the position of the pouring spout 5. As shown in Fig. 23, a movable portion of the inner bag can easily go into the fixed portion of the inner bag, as the inner bag is fixed to the upper portions of panels 602a', 602b', 602c' and 602d'. That is, if the inner bag 3 is fixed to only three panesl 602a', 602b', and 602c', the portion of the inner bag on the non-fixed panel 602d' may be a fixed portion and shut the pouring spout 5. Next, with reference to Figs. 24 and 25, a modification of the seventh embodiment will be described. As shown in these figures, a BIC 651 is formed of a box-shaped carton 652 and a flexible inner bag contained therein. The carton 652 is formed in a rectangularly parallelopiped shape and has six rectangular surfaces which are four side surfaces 652a, 652b, 652c, and 652d and two end surfaces 652e and 652f. The inner bag 3 is partially adhered and fixed to the inner surfaces of the carton 652.. In Fig. 25, reference numeral 656 is the fixed portion of the inner bag. Thus, the fixed portion 656 consists of all the area of the surface 652b, a trapezoidal area of the surface 652c, and all the area of the surface 652a. As shown in Fig. 24, the carton 652 is formed by assembling a carton blank 652'. The carton blank 652' has panels 652a', 652b', 652c', 652e', and 652f' and a paste-up margin 652g'. A paste 670 is applied to the almost all the area of the panel 652a', a trapezoidal area of the panel 652c', and the paste-up margin 652g'. Thus, the inner bag is fixed to all the area of the surface 652b, the trapezoidal area of the surface 652c, and all the area of the surface 652a. In Figs. 24 and 25, the pouring spout 658 is mounted to a pouring spout position 660. A passage member 665 is mounted on the pouring spout 658. In addition, a cap 659 is mounted on the pouring spout 658. In Fig. 25, reference numeral 690 is a boundary of the fixed portion and movable portion of the inner bag. As shown in Figs. 24 and 25, the inner bag 3 adheres to the paste-up margin 652g' at two points by the paste 670, and therefore is fixed to all the area of the panel 652a. Not only the carbon 652 but also the inner bag can be kept in a rectangularly parallelopiped shape during assembly because the inner bag is fixed to all the area of the panel 652a. The inner bag can not be loosened during mounting the pouring spout 5, and therefore the poring spout 5 can be easily mounted. When a content within the inner bag is sucked out, the inner bag is detached at the two adherent points of the paste-up margin 652g', and then the movable portion of the inner bag can easily go toward the pouring spout 5.

Claims: A pouring spout (5; 25; 35; 105; 125; 208; 305; 405; 508; 658) to be disposed on a flexible bag or on a carton of a bag-in-carton, adapted for containing a content comprising: a cylindrical portion (125; 211), defining a throughhole which extends to the inside and the outside of said bag, a flange (105a ; 212) on the outer periphery of said cylindrical portion, and a passage member (125d; 214, 215) extending in a direction of the flange and adapted for guiding said content characterized in that the passage member (125d; 214, 215) is integrally formed with the flange on a side surface of said cylindrical portion and that the passage member is kept in a predetermined position relative to the throughhole of the pouring spout. A pouring spout as defined in claim 1 having at least one protruding portion (213), in particular a plurality thereof, extending to the inside of said bag or along an axial line of said cylindrical portion and piercing through said bag. A pouring spout as defined in claim 1 or 2 wherein the flange (105a ; 212) on the outer periphery of said cylindrical portion is connected with said bag. A pouring spout as defined in claims 1 to 3, wherein said cylindrical portion, said passage member and/or said flange being integrally formed. A pouring spout as defined in anyone of the preceeding claims, wherein said passage member is formed in an H-letter shape. A bag-in-carton, comprising: a carton (2; 22; 32; 102; 122; 202; 302; 402; 502; 652) formed in a substantially rectangularly parallelepiped shape or a closed box-shaped carton (2; 22; 32; 102; 122; 202; 302; 402; 502; 652); a flexible inner bag (3; 23; 33; 103; 123; 203; 303; 403; 503; 653) disposed in said carton and adapted for containing a content; and a pouring spout (5; 25; 35; 105; 125; 208; 305; 405; 508; 658) according to anyone of the preceeding claims, disposed on said carton and piercing through said inner bag. The bag-in-carton as defined in claim 6, wherein said inner bag is formed by sealing both ends of a cylindrical film and bottom side portions of triangular flaps formed on both sides of both ends of said cylindrical film. The bag-in-carton as defined in claim 6, wherein at least one ruled line is formed on at least one of wide surfaces of said carton to allow bending thereof.

Inventors: BIZEN TAKEHIKO, MIYAMA HIROSHI, MORISAKO TAKESHI, SASAKI YASUYUKI, TSUKADA HIROKO, BIZEN, TAKEHIKO, MIYAMA, HIROSHI, MORISAKO, TAKESHI, SASAKI, YASUYUKI, TSUKADA, HIROKO, Bizen, Takehiko, c/o Dai Nippon Printing Co. Ltd., Miyama, Hiroshi, c/o Dai Nippon Printing Co. Ltd., MORISAKO, TAKESHI, DAI NIPPON PRINTING CO. LTD., Sasaki, Yasuyuki, c/o Dai Nippon Printing Co. Ltd., TSUKADA, HIROKO, DAI NIPPON PRINTING CO. LTD.
Applicants: DAINIPPON PRINTING CO LTD, DAI NIPPON PRINTING CO., LTD.
Application year: 1993
Main classification: B65D77
IPC codes: B65D77