Patent Publication Number: US-7712290-B2

Title: Container packaging apparatus

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a container packaging apparatus, and in particular to a container packaging apparatus for packaging a container, for example, a wafer case containing a plurality of semiconductor wafers therein, so as to be packed in a packaging bag, such as a plastic bag. 
   2. Description of the Related Art 
   In order to prevent any damage or contamination during being transported, semiconductor wafers, such as silicon wafers, which have been manufactured in a wafer manufacturing plant are typically loaded into a wafer cassette, an intermediate holder, made of synthetic resin, which is in turn packed in a wafer case whose cover can be closed tightly via a gasket (a packing member). The wafer case is further packed firstly in an inner bag made of nylon (the trade name of polyamide fiber) and then in an outer bag made of aluminum, in which the wafer case may be enclosed in respective bags via heat sealing. This provides a packaging structure that can prevent any external fine dust or the like from entering into the wafer case to form a deposit on the wafer surface during the transporting operation. 
   To carry out manually the packaging procedure as described above, firstly the container is inserted into the packaging bag, and then the packaging bag in its sealing area is set in a heat sealing machine or a pressure sealing machine which may carry out the sealing operation with or without deaeration. Subsequently, an opening region and a rear end portion located opposite to the opening region of the packaging bag are folded manually, and both of the end portions of the packaging bag are fixed securely with tape attached thereon, respectively. 
   If all of the above steps are carried out manually, it takes a considerably long time to accomplish the packaging procedure and adversely it tends to develop crimps in the sealed area. In addition, when carrying out the packaging process incorporated with the deaeration effective in the bag, the condition after the deaeration varies widely, inhibiting the stable packaging procedure to be accomplished. Further disadvantageously, the process of folding and fixing the end portions of the packaging bag by attaching the tape has also imposed a lot of troubles. 
   There is one known apparatus to address the above problem, including a container packaging apparatus as disclosed in the cited reference, Patent Document No. 1, for example. The container packaging apparatus disclosed by the cited Patent document No. 1 allows for the packaging procedure to be carried out by the divided steps, where the container packaging apparatus comprises: a packaging bag supply means for supplying a transverse-mounted packaging bag into a predetermined position; a container loader means for supplying a container to be packed into a predetermined position; a container insertion means operable to hold by vacuum chuck an opening region of a packaging bag with the aid of a pair of vertically arranged suction arms so as to open the packaging bag in the site of the opening region by moving each of the pair of suction arms vertically away from each other and subsequently to insert the container into the packaging bag through thus opened opening of the bag; a shaping means operable to deaerate the packaging bag containing the container packed therein by a suction nozzle and subsequently to make a heat-seal for closing the opening by a pair of upper and lower sealing bars; and a packaging bag end portion processing means operable to fold an end portion of the sealed packaging bag and fix the folded end portion of the packaging bag. 
   According to the cited Patent Document No. 1, in the packaging process for carrying out the steps including, inserting the container into the packaging bag; deaeration and packing of the container; heat sealing in the opening of the packaging bag; folding the end portion of the packaging bag; and attaching the tape (label), the packaging apparatus can make the packages uniform in their quality, even if containers different in size, shape or the like are mixedly transferred through respective steps, so as to facilitate mechanization and automation of respective processes and thereby improve a throughput in the packaging procedure. 
   [Patent Document No. 1] 
   Japanese Patent Laid-open Publication No. 2002-154505 
   However, in the cited Patent Document No. 1, when the packaging bag with a container housed therein is deaerated via suction nozzle, the deaeration operation is typically carried out without any solution to position and hold the both side ends of the opening of the packaging bag in place. The apparatus of the cited Patent Document No. 1 has the following drawbacks in association with this manner of the deaeration. 
   Specifically, crimps are more apt to appear in the opening region of the packaging bag during the deaeration operation, and the heat sealing operation in the opening region, if subsequently applied as in this condition, would cause a problem in the sealing property of the packaging bag. In addition, owing to the crimps developed in the sealed area, the left and the right triangular ear portions in the front end portion of the packaging bag tend to emerge unevenly in its size and shape Consequently, when each of the triangular ear portions in the front end portion and the rear end portion of the packaging bag is folded and fixed with the tape in both sides with respect to the container, the triangular ear portions formed in the front end side of the packaging bag could not be long enough to be fixed well, inhibiting respective sets of triangular ear portions, each set including one in the front end portion and the other in the rear end portions of the packaging bag, from being fixed together by using a predetermined length of tape, and thus the packaging of the container with a resultant high level of quality and the stability during the procedure could not be obtained. 
   In the light of the above circumstances, the inventors of the present invention have made an enthusiastic research and realized from their research that if the both side ends of the opening region of the packaging bag are positioned and held in place by a side edge chuck means during the deaeration operation, there would be substantially no crimps developed in the opening region of the packaging bag during its being deaerated. This can help provide the packaging bag with a high level of sealing property and a solution to eliminate the unevenness in size and shape between the left and the right triangular ear portions in the front end portion of the packaging bag resultant from the crimps. The inventors of the present invention have accomplished the invention based on their further finding that respective sets of triangular ear portions, each set including one in the bag front end portion and the other in the bag rear end portion, can be fixed together well securely with the tape on either side surface of the packaging bag, thereby providing the packaging of the container with the resultant high level of quality in the stable manner. 
   BRIEF SUMMERY OF THE INVENTION 
   An object of a first invention is to provide a container packaging apparatus, which can suppress the development of crimps in a sealed area of the packaging bag, thereby providing a high level of sealing property of the packaging bag and a packaging of the container with a resultant high level of quality in a stable manner. 
   Another object of the first invention is to provide a container packaging apparatus, which can provide a solution to eliminate unevenness in size and shape between left and right triangular ear portions in the front and the rear end portions of a packaging bag resultant from migration of the container within the packaging bag during a deaeration operation. 
   A first invention that has been developed to achieve the objects described above provides a container packaging apparatus comprising: a bag opening means for opening a transversely-mounted packaging bag in its site of an opening region defined exclusively in a tip end portion of the packaging bag; a container insertion means for inserting a container into the packaging bag through an opening that has been actually opened in the packaging bag in its site of the opening region; a bag sealing means having a pair of upper and lower sealing members for sealing the opening; a deaeration means for exhausting air inside the packaging bag through a deaeration nozzle that has been inserted from a space defined between the sealing members into the packaging bag through the opening; and a side edge chuck member for positioning and holding both side ends of the opening during a deaeration operation by the deaeration means. 
   According to the first invention, since the both side ends of the opening of the packaging bag are positioned and held in place by a side edge chuck means during the deaeration operation, therefore there would be substantially no crimps developed in the opening region of the packaging bag during its being deaerated. This can help provide the packaging bag with a high level of sealing property and a solution to eliminate the unevenness in size and shape between the left and the right triangular ear portions in the front end portion of the packaging bag resultant from the crimps. Further advantageously, respective sets of triangular ear portions, each set including one in the bag front end portion and the other in the bag rear end portion, can be fixed together well securely with the tape on either side surface of the packaging bag. Consequently, it becomes possible to provide the packaging of the container with the resultant high level of quality in the stable manner. 
   Any type of container may be applicable. For example, a wafer case containing semiconductor wafers therein may be employed. 
   A container of any material and shape may be applicable so far as the container can be packed well in the packaging bag. 
   A packaging bag used herein means such a bag that has a rectangular shape in plan view as in a state of the bag having been evacuated of the air inside thereof and that has an opening region defined in only one end portion and is closed in three other end portions. 
   An end (end portion) of the packaging bag defining the opening region is herein referred to as one end (one end portion), a tip (tip portion) or a front end (front end portion). In addition, another end (end portion) of the packaging bag located opposite to the one end defining the opening region of the packaging bag is herein referred to as the other end (the other end portion) or a rear end (rear end portion). Remaining two ends (end portions) other than the front and the rear ends of the packaging bag are herein referred to as side ends (side end portions). Further, a bag longitudinal direction (direction along the length of the packaging bag) means herein a direction connecting the front end to the rear end (front-rear direction) of the packaging bag. A bag width direction (direction along the width of the packaging bag) means herein a direction connecting one of the side ends and the other of the side ends (left-right direction) of the packaging bag. A top to back direction of the packaging bag means herein a direction along a thickness of the packaging bag. A top surface (top side) of the packaging bag means herein a surface (side) facing up when the evacuated packaging bag is loaded on a horizontal table (floor surface). A back surface (back side) of the packaging bag means herein a surface (side) facing down when the evacuated packaging bag is loaded on a horizontal table (floor surface). 
   A packaging bag in a transversely-mounted state means herein that in a state where the evacuated packaging bag is mounted on a horizontal table (floor surface). 
   A packaging bag being opened means herein a course of a gap (space) being formed in an opening plane of the packaging bag. A radial direction from an approximately central location of the opening taken as the center means herein a radial direction extending along a plane that has been defined in the opening in the packaging bag, specifically from an approximately central location of the plane defined in the opening taken as the center. 
   The material of the packaging bag may employ, for example, a variety of synthetic resins (e.g., polyamide resins, polypropylene, polyethylene), a variety of metals (e.g., aluminum) and the like. 
   As for the type of packaging bag, the bag may be, for example, a three-side sealed flat bag that is open exclusively in its tip end or a gusseted bag. In case of the gusseted bag to be used, a sheet of packaging bag may be fed by pinch rolls or may be transferred as held by a vacuum chuck. 
   The bag opening means may be of any configuration so far as it has a structure capable of expanding (actually opening) the site of the opening of the packaging bag. For example, one such configuration may be employed that has a pair of vacuum suction pads, each adapted to hold by vacuum chuck the top or the back side of the packing bag, and a means for moving both of the vacuum pads to come closer to/part away from each other. 
   The container insertion means may be of any configuration so far as it has a structure capable of inserting the container into the packaging bag. For example, the container insertion means may employ such a configuration, in which the container is supported by a support member and the container, as it being supported, is inserted into the bag through the opening thereof by moving the support member horizontally by means of a push-in mechanism. 
   The bag sealing means may have its sealing mechanism of any type so far as it has a pair of upper and lower sealing bars and is capable of sealing the opening. For example, the bag sealing means may be of a heat sealing type having a pair of upper and lower sealing bars equipped with electrically-heated wires embedded therein respectively or a pressure sealing type having a pair of upper and lower pressure bars. 
   Although the length of the sealing member may be the same as the length of the opening region, preferably the former may be a bit longer than the latter with some room for the length available in use. 
   The material of the sealing member may employ, for example, a variety of metals, a variety of synthetic resins of heat insulating property, and a variety of ceramics. 
   The deaeration nozzle having low profile may be preferably employed, because the low-profile configuration of the nozzle can facilitate the deaeration operation by inserting the nozzle through a space between the sealing members. The material of the deaeration nozzle may employ, for example, a variety of metals, and a variety of synthetic resins of heat insulating property. 
   The number of deaeration nozzles to be used may be one or more. 
   The deaeration means may employ such a device that comprises a nozzle insertion/retraction device (e.g. air cylinder) for inserting or retracting the deaeration nozzle into or out of the opening of the packaging bag, and a vacuum generator. 
   The deaeration used herein means to exhaust the packaging gag of its internal air by vacuum. 
   A side edge chuck means may employ any type of chuck mechanism for a side edge of the packaging bag, so far as it is capable of positioning and holding the both side ends of the opening in place. For example, the side edge chuck means may employ a chuck mechanism using an air cylinder or an electric-powered cylinder. 
   A second invention provides a container packaging apparatus as defined in the first invention, which further comprises a container positioning means for restricting the migration of the container within the packaging bag during a deaeration operation by the deaeration means. 
   According to the second invention, since the migration of the container within the packaging bag during the deaeration operation can be restricted with the aid of the container positioning means, so a solution can be provided to eliminate the unevenness in size and shape between the left and the right triangular ear portions in the front and the rear end portions of the packaging bag resultant from the migration of the container within the packaging bag during the deaeration operation. Consequently, it becomes possible to provide the packaging of the container with a relatively higher level of quality and a more stable manner over the first invention. 
   The container positioning means may employ any type of mechanism so far as it is capable of restricting the migration of the container within the packaging bag during the deaeration operation. For example, it may employ an air cylinder or an electric-powered cylinder. 
   According to the first invention, since the both side ends of the opening of the packaging bag are positioned and held in place by a side edge chuck means during the deaeration operation, therefore the development of crimps in the sealed area of the packaging bag can be suppressed, so that the high level of sealing property of the packaging bag and thus the packaging of the container with the resultant high level of quality in the stable manner can be obtained. 
   According to the second invention, since the migration of the container within the packaging bag during the deaeration operation can be restricted with the aid of the container positioning means, therefore the solution can be provided to eliminate the unevenness in size and shape between the left and the right triangular ear portions in the front and the rear end portions of the packaging bag resultant from the migration of the container within the packaging bag during the deaeration operation. Consequently, it becomes possible to provide the packaging of the container with a much higher level of quality and the stable manner. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view showing how a container is inserted into a packaging bag in a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 2  is a plan view showing an arrangement of respective stages included in a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 3  is a perspective view showing a creasing means and a bag rear end ear portion folding means of a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 4  is a perspective view showing a sealing means and a deaeration means for a packaging bag of a container packaging apparatus according to an embodiment of the present invention, 
       FIG. 5  is a perspective view showing a state of a packaging bag including a container packed inside thereof before an operation of folding back triangular ear portions in a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 6  is a perspective view showing a bag front end ear folding means and a bag rear end ear folding means for respective triangular ear portions of a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 7  is a front elevational view showing a creasing means of a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 8  is a front elevational view showing a side edge chuck means of a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 9  is a front elevational view of a container positioning means of a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 10  is a flow chart showing a set of operations in a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 11  is a flow chart showing another set of operations in a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 12  is a side elevational view showing how a packaging bag is picked up by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 13  is a side elevational view showing how the packaging bag that has been picked up is then drawn out by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 14  is a side elevational view showing a state of a packaging bag immediately before its being opened by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 15  is a side elevational view showing how a packaging bag is opened by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 16  is a side elevational view showing how an opening of a packaging bag is expanded by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 17  is a side elevational view showing how a container is inserted into a packaging bag by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 18  is a side elevational view showing how a folding-back line of a triangular ear portion in the bag rear end portion is creased by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 19  is a side elevational view showing how a triangular ear portion in the bag rear end portion is folded back by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 20  is a side elevational view showing how the inside of a packaging bag is deaerated by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 21  is a side elevational view showing how a packaging bag is sealed by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 22  is a side elevational view showing how a triangular ear portion of a packaging bag is fixed with tape by a container packaging apparatus according to an embodiment of the present invention; 
       FIG. 23  is an enlarged side elevational view showing a bag tip end chuck means of a container packaging apparatus according to an embodiment of the present invention; and 
       FIG. 24  is a side elevational view showing a case elevation means of a container packaging apparatus according to an embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The present invention will now be described with reference to the attached drawings. It is to be noticed herein for clarity of the description that: Y 1  direction designates a direction along which a container is inserted into a packaging bag; Y 2  direction designates a direction opposite to the direction along which a container is inserted into a packaging bag, X 1  direction designates one direction orthogonal to the Y 1 -Y 2  direction in a plane; and X 2  direction designates the other direction orthogonal to the Y 1 -Y 2  direction in the plane. 
   It is to be noticed that a container used herein has employed a wafer case holding therein a plurality of wafer cassettes, or intermediate holders, in each of which a silicon wafer is housed. The wafer case is to be firstly inserted and packed in a packaging bag (an inner bag) and then placed in an outer bag made of aluminum for double packing. It is to be understood that the packing procedure by the outer bag is the same as that provided by the inner bag. Accordingly, the duplicated explanation is herein omitted. 
   With reference to  FIG. 1 , reference numeral  10  designates a container packaging apparatus according to an embodiment of the present invention, which is operable to open a packaging bag having an opening region defined exclusively in its tip end and sealed in the other three sides and then to insert a wafer case (i.e., a container)  12  that is configured in approximately rectangular parallelepiped into the bag for packing. The packaging bag  11  has employed a flat bag made of nylon (the trade name of polyamide fiber) and sized to accommodate the wafer case  12 . 
   As shown in  FIG. 2 , the container packaging apparatus  10  is divided into five stages arranged in the lying-T configuration seen in plan view. 
   Specifically, the container packaging apparatus  10  comprises: a first stage S 1  where a pile of packaging bags  11  is loaded on a bag stock carriage  13  ( FIGS. 12 and 13 ); a second stage S 2  disposed in the Y 2  side with respect to the stage S 1 , in which the wafer case  12  is inserted (introduced) into the packaging bag  1 ; a third stage S 3  disposed in the Y 2  side with respect to the second stage S 2 , on which the wafer case  12  is positioned to stand by for the insertion into the bag  11 ; a fourth stage S 4  disposed in the X 1  side with respect to the second stage S 2 , which is operable to carry out a series of operations consisting of deaeration of the packaging bag  11  after the insertion of the case (after the insertion of the container), shaping of a triangular ear portion  11   a  ( FIG. 3 ) to be defined in a rear end portion of the packaging bag  11  and sealing of the opening of the packaging bag  11 ; and a fifth stage S 5  disposed in the X 1  side with respect to the fourth stage S 4 , which is operable to fold the triangular ear portions  11   a  in a front end portion of the packaging bag  11  and to fix the triangular ear portions  11   a  in the front and the rear end portions with tape. 
   There is a bag stock carriage  13  in the first stage S 1 , on which a plurality of packaging bags  11  are mounted transversely along the length of the bag taken as the horizontal direction, as shown in  FIG. 2  and  FIG. 12 . In this state, the opening region of each of the packaging bag  11  is facing to the Y 2  direction. In addition, the bag stock carriage  13  is arranged such that the opening region of each packaging bag is positioned within the second stage S 2  zone. 
   A plurality of pickup pads  14  ( FIG. 12 ) is disposed in the second stage S 2 , which is operable to hold by vacuum chuck and then to lift up a region adjacent to the opening of the packaging bag  11 , specifically the packaging bag placed on the top of the pile of packaging bags  11  mounted on the bag stock carriage  13 . The opening region of the packing bag  11  that has been lifted up by the pickup pads  14  is then chucked (clamped) by a pair of upper and lower bag rear end fixing members  15  of a bag rear end chuck means (i.e., a bag rear end fixing means)  16 , and the packaging bag  11  is transferred in its entirety into a zone defined within the second stage S 2 . Then, the front end portion of the packaging bag  11  is chucked by a bag front end chuck means  17 , which will be described later, and then the bag rear end chuck means  16  returns back to an end portion of the second stage S 2  defined in the Y 1  side, where it chucks the rear end portion of the packaging bag  11  with its bag rear end fixing members  15 . 
   The bag rear end chuck means  16  is disposed in a space above the second stage S 2  and has a bag rear end fixing conveyer C 1  ( FIG. 12 ) in the form of belt to transfer the respective pickup pads  14  and the pair of bag rear end fixing members  15  between opposite ends of the stage S 2 , one end defined in the Y 1  side and the other end defined in the Y 2  side. 
   The bag rear end fixing conveyer C 1  is fixedly attached with an upper end portion of an elevating air cylinder  16   a  with a tip end of a rod thereof directed downward. The tip portion of the rod is fixedly attached with an elevating plate  16   b  extending in the X 1 -X 2  direction and holding the respective pickup pads  14  and the pair of bag rear end fixing members  15 , each attached thereto. Both the ends of the elevating plate  16   b  defined in the X 1 -X 2  direction is provided with a pair of bag rear end chucking air cylinders (i.e., a fixing member moving unit)  16   c  operable to move both of the bag rear end fixing members  15  to come closer to/part away from each other by protruding/retracting rods. To come closer/part away from used herein means moving subjects (herein, the bag rear end fixing members  15 ) closer to/away from each other. 
   Specifically, in the space above the end of the stage S 2  in the Y 1  side, the elevating air cylinder  16   a  causes the respective pickup pads  14  and both of the bag rear end fixing members  15  to make an up or down movement simultaneously so as to hold by vacuum chuck and then to lift up the region adjacent to the opening of the packaging bag  11 , in particular the packaging bag placed on the top of the pile of packaging bags  11  mounted on the bag stock carriage  13 . Immediately after that operation, the rods of the bag rear end chucking air cylinders  16   c  are retracted so as to cause both the bag rear end fixing members  15  to chuck the opening region of the packaging bag  11 . As it is, the bag rear end fixing conveyer C 1  transfers the elevating plate  16   b  into the zone of second stage S 2  in the Y 2  side to thereby place the entire packaging bag  11  that has been picked up into the zone within the second stage S 2 . 
   Further, the bag front end chuck means  17  ( FIG. 23 ) is disposed in the end portion of the second stage S 2  in its Y 2  side, which is operable to releasably fix a tip end portion (end portion defined in the opening side) of the packaging bag  11 , in particular at its both side portions in the bag width direction. The bag front end chuck means  17  has: a pair of swing arms  17   b , each capable of swinging around a horizontal shaft  17   a  as a pivot axis, which are disposed in end portions of the second stage S 2  defined in the Y 2  side, in particular at the one end in the X 1  side and at the other end in the X 2  side; a pair of swing motion actuating air cylinders  17   c  disposed in lower end portions (base) of respective swing arms  17   b  for driving the swing arms  17   b  to make the swing motion; a position control conveyer  17   d  in the form of belt, which extends along the X 1 -X 2  direction and causes each of the pair of swing motion actuating air cylinders  17 C to come closer to/part away from each other; two pair of upper and lower bag tip side edge chuck members  18  each pair disposed in upper end portion of the swing arm  17   b  for clamping the tip end portion of the packaging bag  11  at one of both sides thereof; and a pair of chucking air cylinders  17   e  operatively disposed on each of the swing arm  17   b  so as to protrude/retract an upwardly headed rod to thereby drive the bag tip side edge chuck members  18  to come closer to/part away from each other. 
   Specifically, both of the swing motion actuating air cylinders  17   c  are actuated to cause both of the swing arms  17   b  to make a swing motion to thereby position respective corresponding bag tip side edge chuck members  18  in respective sides of the tip end portion of the packaging bag  11 . Subsequently, both of the chucking air cylinders  17   e  are actuated to move respective pair of the upper and the lower bag tip side edge chuck members  18  in the direction of approaching to each other to thereby chuck the tip end portion of the packaging bag  11  in its both sides. To control the tension applied to the tip end portion (the opening region) of the packaging bag  11 , the position control conveyer  17   d  is actuated to cause each of the swing arms in association with the swing motion actuating air cylinders  17   c  to come closer to/part away from each other. 
   In addition, a bag opening means  19  is disposed in the second stage S 2 , which is operable to hold by vacuum chuck the upper and the lower sides of the packaging bag  11  in its opening region, respectively, so as to open the packaging bag  11  in the site of the opening region. The bag opening means  19  is attached to a rectangular stationary frame  19   a  installed upright with its frame width direction in line with the Y 1 -Y 2  direction in the second stage S 2  defined in its Y 2  side end portion. A pair of upper and lower air cylinders  19   b  is arranged with their rods directed toward each other at intermediate locations in the longitudinal direction of an upper and a lower frame parts of the stationary frame  19   a . Two pairs of upper and lower opening pads  20  are disposed in tip end portions of respective rods for holding by vacuum the packaging bag  11  in the upper and the lower sides in its opening region. 
   Specifically, both of the air cylinders  19   b  protrude the rods outward in a synchronized manner to thus cause, with an aid of the elevating plate  19   c , the two pairs of upper and lower opening pads  20  to hold by vacuum chuck the packaging bag  11  in its upper and the lower sides in the opening region, and then the air cylinders  19   b  actuate the associated rods to be retracted synchronously so as to cause the two pairs of upper and lower opening pads  20  to part away from each other by a certain distance. As a result, the packaging bag  11  is open in the site of the opening region. 
   The second stage S 2  is further provided with a creasing means  21  for making a folding-back line in the site of the root of each of the triangular ear portions la emerging in both sides of the rear end portion of the packaging bag  11  after the wafer case  12  has been inserted into the packaging bag  11  and before the triangular ear portions  11   a  are folded back over each side of the container  12 . The creasing means  21  is installed in the second stage S 2  specifically in its lower space defined in the Y 1  direction side with respect to the stationary frame  19   a , and comprises a pair of left and right air cylinders  22  (a bar rising and falling means) mounted via a case carrier  50  and a pair of left and right ear folding and shaping bars  25  coupled to tip portions of rods  22   a  of respective air cylinders  22  via pivot pins  23  extending along the Y 1 -Y 2  direction and links  24 , each bar  25  serving as a folding-back guide for corresponding one of the triangular ear portions ( FIG. 3  and  FIG. 7 ). The case carrier  50  as mentioned above designates a table on which the wafer case  12  is placed immediately after its having been inserted into the bag. 
   Specifically, when the rods  22   a  of both air cylinders  22  are pushed out, each of the ear folding and shaping bars  25  exhibits a swing motion in a vertical plane around the pivot pin  23  so as to be pressed against a root of each triangular ear portion  11   a  in its side to be folded back consequently, air inside both of the triangular ear portions  11   a  can be pushed out of the triangular ear portions  11   a . It is to be noted that the triangular ear portions  11   a  would have emerged as a result of the folding of both of the side portions of the packaging bag  11 . 
   A container transfer table  51  is disposed between a central portion of the second stage S 2  and a central portion of the fourth stage S 4 , which makes a reciprocating movement between the two stages, S 2  and S 4 , via a belt conveyer C 2  extending in the X 1 -X 2  direction. The container transfer table  51  has a structure capable of accommodating the case carrier  50  in a space defined inside the transfer table  51  without having any contact with the case carrier  50  during moving into the second stage S 2 . A bag rear end ear folding means  26  is disposed in a top plate of the container transfer table  51  in its end portion defined in the Y 1  side, which after the insertion of the container, is actuated to fold back each of the triangular ear portions  11   a  over respective sides of the wafer case  12 , which ear portions  11   a  would have emerged in both sides of the rear end portions of the packaging bag  11 . 
   The bag rear end ear folding means  26  comprises a pair of ear folding plates  27  capable of swinging horizontally around vertical shafts  26   a  as pivots disposed in end portions of the container transfer table  51  defined in its Y 1  side, specifically one end in the X 1  side and the other end in the X 2  side, and a pair of air cylinders  26   b  disposed in the end portions of the container transfer table  51  defined in its Y 1  side in proximity to the respective vertical shafts  26   a . The ear folding plates  27  are spaced apart from each other by a distance a bit longer than the length of the wafer case  12  along the X 1 -X 2  direction. The actuation of both of the air cylinders  26   b  to protrude the respective rods outward can cause a swing motion of the vertical shafts  26   a  rotatably coupled to tip portions of the respective rods via coupling elements  26   c , so that each one of the ear folding plates  27  is actuated to fold back each one of the triangular ear portions  11   a , which has been creased with the folding-back line in the site of the root thereof by each of the ear folding and shaping bars  25 , toward the corresponding side surface of the case. 
   Further, a side edge chuck means  28  adapted to chuck the packaging bag  11  in both side edges defined in the opening side is disposed in a top plate of the container transfer table  51  in its end portion defined in the Y 2  side ( FIG. 4  and  FIG. 8 ). The side edge chuck means  28  comprises: a pair of swing arms  29  rotatable around horizontal shafts  29   a  as pivots extending along the Y 1 -Y 2  direction disposed in end portions of the top plate of the container transfer table  51 , specifically one end in the X 1  side and the other end in the X 2  side; a pair of rotary motors  30  for actuating both swing arms  29  to make a swing motion; a total of two pairs of side edge chuck members  31 , each one pair disposed in a tip portion of each one of the swing arms  29 ; and air cylinders  32 A for causing each pair of side edge chuck members  31  to come closer to/part away from each other by protruding/retracting rods. Both of the swing arms  29  are spaced apart from each other by a distance a bit longer than the length of the wafer case  12  along the X 1 -X 2  direction. 
   Specifically, the swing motion of each of the swing arms  29  around each of the horizontal shafts  29   a  as the pivot by each of the rotary motors  30  causes each pair of side edge chuck members to come closer to the each side edge in the proximity to the opening of the packaging bag  11 . Then, protruding of the rod  32 A of the air cylinder can actuate the side edge chuck members  31  so as to chuck each side edge of the packaging bag  1  between the paired side edge chuck members  31 . Control of the tension applied to the opening region of the packaging bag  11  may be accomplished by changing the spacing between both swing arms  29  via an arm position control conveyer (belt conveyer) C 3  extending in the X 1 -X 2  direction across the full length of the end portion of the top plate of the container transfer table  51  defined in the Y 2  side. 
   A case elevation means  60  is disposed on the top plate of the container transfer table  51 , which is operable to pick up the wafer case  12  from the case carrier  50  ( FIG. 24 ). The case elevation means  60  comprises: a pair of pick up cylinders  61  disposed in both end portions in the X 1 -X 2  direction of the top plate of the container transfer table  51  and having rods heading downward; a pair of rotary motors  62  mounted fixedly to tip portions of the rods heading downward; and a pair of container clamping plates  64  mounted fixedly to tip portions of output shafts extending in the Y 1 -Y 2  direction of respective rotary motors  62  and capable of supporting outwardly overhanging outer edge portions of a cover element of the wafer case  12 , specifically both side portions along the X 1 -X 2  direction, respectively from under side. 
   Specifically, both the rotary motors  62  are driven to rotate the output shafts and thereby to clamp by both container clamping plates  64  the cover of the wafer case  12  loaded on the case carrier  50 . Then, both of the rods of the pickup cylinders  61  are retracted so as to pick up the wafer case  12  by a small distance from the case carrier  50 . To release the picking up of the wafer case  12 , a series of operations in the pickup procedure as described above should be performed in an inverse order. 
   As seen from  FIG. 1  and  FIG. 17 , an opening expansion means  33  having four expanding members  32  is disposed in the third stage S 3 . Each one of the expanding members  32 , provided in the form of a bar extending in the Y 1 -Y 2  direction, is retractably inserted into the packaging bag  11  through the opening. Then, the respective expanding members  32  are moved radially in the different directions from the approximately central location of the opening taken as the center (in the radial direction by every 90° along the circumference) to thereby expand an open area of the opening from the inside thereof. 
   The opening expansion means  33  is disposed in an end portion of the third stage S 3  in its Y 1  side and has a rectangular movable base frame  70  whose width direction is in line with the Y 1 -Y 2  direction ( FIG. 15 ). The movable base frame  70  is sized to pass through an interior space of the stationary frame  19   a  as described above The movable base frame  70  is configured such that it can be advanced and retracted freely with respect to the packaging bag  11 , that has been open within the second stage S 2  zone, by the aid of a belt conveyer C 5  extending in the Y 1 -Y 2  direction disposed immediately beneath the movable base frame  70 . A total of four air cylinders  71  are disposed in four corner portions of the movable base frame  70 , each of which is operable to move each corresponding expanding member  32  in the radial direction from the approximately central location of the opening taken as the center by protruding/retracting a rod whose tip directed to an approximately central location of the movable base frame  70 . 
   Specifically, to insert each of the expanding members  32  into the packaging bag  11 , the rod of each air cylinder  71  is protruded so as to introduce the total of four expanding members  32  into the opened packaging bag  11  via the movable base frame  70  by the belt conveyer C 5 . To expand the opening of the packaging bag  11 , the rods of the respective air cylinders  71  are simultaneously retracted. This can effectively move the four of expanding members  32  simultaneously in the radial directions from the approximately central location of the opening taken as the center to thereby expand the opening to a size sufficient for the wafer case  12  to be inserted into the bag without any interference. 
   In addition, a container insertion means  34  is disposed in the third stage S 3 , which is operable to insert the wafer case  12  into the packaging bag  11  through the opening. The container insertion means  34  comprises: a pair of container support bars  35  extending in the Y 1 -Y 2  direction and capable of supporting the outwardly overhanging outer edge portions of the cover element of the wafer case  12 , specifically both side portions in the X 1 -X 2  direction from beneath thereof; an anchor table  36  by which each of the container support bars  35  is held in a cantilever manner; a pair of belt conveyers C 4  that is longer than the belt conveyer C 5  for the movable base frame  70  as described above and operable to make a reciprocating motion of the anchor table  36  substantially across the entire length of the third stage S 3  along the Y 1 -Y 2  direction. Both belt conveyers C 4  are driven synchronously 
   Specifically, both belt conveyers C 4  are actuated to move the anchor table  36  in the Y 1  direction to thereby catch the cover element of the wafer case  12  and thus hold the wafer case  12  in the cantilever manner by a pair of container support bars  35  in the course of the wafer case  12  being transferred, and then the anchor table  36 , as in this condition, is further moved in the Y 1  direction to thereby bring the wafer case  12  into the second stage S 2  zone, where the wafer case  12  is inserted into the opened packaging bag  11 . 
   As shown in  FIGS. 4 ,  8 ,  20  and  21 , a bag sealing means  37  is disposed in the fourth stage S 4 , which provides a heat seal (closing by heat) in the opening of the packaging bag  11 . The bag sealing means  37  comprises a pair of upper and lower sealing bars (sealing members)  38   a  extending in the X 1 -X 2  direction, which is disposed in an end of the fourth stage S 4  in its Y 2  side and equipped with electrically-heated wires embedded therein respectively, and a sealing air cylinder  37   a  for causing both the sealing bars  38   a  to come closer to/part away from each other. A rod of the air cylinder  37   a  is protruded outward to thereby cause both the sealing bars  38   a  to come closer to each other. Thus, the opening of the packaging bag  11  clamped between the pair of sealing bars  38   a  can be heat-sealed. 
   A deaeration means  39  is provided in the fourth stage S 4 , which serves to suck the internal air out of the packaging bag  11  during heat-sealing. The deaeration means  39  comprises a thin deaeration nozzle  40  disposed in an end portion of the fourth stage in its Y 2  side and extending in the Y 1 -Y 2  direction, and a nozzle advancing and retracting air cylinder  39   a  operable to drive the deaeration nozzle  40  to make a reciprocating motion in the Y 1 -Y 2  direction to thereby bring/take a tip portion of the deaeration nozzle  40  into/out of the opening of the packaging bag  11 . It is to be noted that the rear end portion of the deaeration nozzle  40  is in communication with a vacuum generator  39   b  disposed external to the container packaging apparatus  10  via a tube. 
   Specifically, when the bag is to be sealed (during the bag being deaerated), firstly the tip portion of the deaeration nozzle  40  is inserted into the opening of the packaging bag  11  by the nozzle advancing and retracting air cylinder  39   a  ( FIG. 20 ). Then, as in this condition, a rod of a pressing air cylinder  37   b  is protruded so as to seal the bag opening entirely by pressing bars  38   b , and the packaging bag  11  is now evacuated of the internal air by a negative pressure from the vacuum generator  39   b  through the deaeration nozzle  40 . After the packaging bag  11  having been evacuated of the air, the tip portion of the deaeration nozzle  40  is with drawn out of the bag by the nozzle advancing and retracting air cylinder  39   a , and then the rod of the sealing air cylinder  37   a  is protruded so as to apply a heat-sealing to the opening region of the packaging bag  11  clamed between both sealing bars  38   a  ( FIG. 21 ). During the heat-sealing operation, with the aid of the pressing bars  35   b  providing the sealing across the entire bag opening, the opening region of the packaging bag  11  can be heat-sealed, as its having been evacuated of the air. 
   A container positioning means  41  for placing the wafer case  12  in position within the packaging bag  11  during the deaeration is provided in the fourth stage S 4  ( FIGS. 4 ,  9 ,  20  and  21 ). The container positioning means  41  comprises a positioning air cylinder  42  disposed in an intermediate location along the longitudinal direction in the end portion of the fourth stage S 4  in its Y 2  side with a tip of a rod thereof facing to the Y 1  direction. A stopper plate  43  is fixedly mounted to the tip portion of the rod, which is in operation pressed against an edge of the cover of the wafer case in its Y 2  side from outside of the packaging bag  11  so as to restrict the migration of the wafer case  12  to the Y 2  side within the bag due to the deaeration work. 
   Specifically, during the bag being sealed, the rod of the positioning air cylinder  42  is pushed out prior to the deaeration such that the stopper plate  43  is brought into abutment on the edge of the cover of the wafer case  12  in its Y 2  side from outside of the packaging bag  11 . Thus, the migration of the wafer case  12  to the Y 2  side within the bag during the subsequently conducted deaeration work can be restricted. Consequently, the triangular ear portions of the packaging bag  11  emerging in the bag front end and the bag rear end can assume as designed in shape and size thereof, thus providing the wafer case  12  with a higher level quality of packaging. 
   A transport conveyer C 6  is provided across a lower portion of the fourth stage S 4  and a lower portion of the fifth stage S 5 , which is operable to feed the wafer case  12  as in the course of packing from the fourth stage S 4  to the fifth stage S 5 . 
   A bag front end ear folding means  44  and a bag rear end ear folding means  26 A are arranged in the fifth stage S 5  ( FIG. 6 ), which is operable to fold back the triangular ear portions  11   a  ( FIG. 5 ) that have emerged in both sides of the front end portion as well as in both sides of the rear end portion of the packaging bag  11 , so as to ride on both side surfaces of the wafer case  12 . 
   The bag front end ear folding means  44  and the bag rear end ear folding means  26 A are substantially identical in configuration with the bag rear end ear folding means  26  disposed in the container transfer table  51  of the second stage S 2 , excluding that those two means  44  and  26 A are positioned symmetrically in the end of the fifth stage S 5  in the Y 1 -Y 2  side. 
   The fifth stage S 5  is further provided with a tape attaching means  46  for settling the front and the rear ends of the packaging bag  11  by attaching a length of adhesive tape  45  transversely across the tip portions of the both triangular ear portions  11   a  located oppositely in the both sides of the wafer case  12  ( FIG. 6  and  FIG. 22Y . The tape attaching means  46  is individually disposed in end portions of the fifth stage F 5 , specifically one end in the X 1  side and the other end in the X 2  side, and has a pair of tape air cylinders  46   a  having tips of rods thereof positioned oppositely to each other and a pair of tape dispenser  46   b , each disposed in the tip portion of the rod and capable of suppling a predetermined length of adhesive tape  45 . 
   Specifically, a predetermined length of tape  45  is supplied by each of the tape dispensers  46   b  and subsequently the rod of each one of the tape air cylinders  46   a  is pushed out. By this operation, the adhesive tape  45  is attached transversely across both of the triangular ear portions  11   a  in both of the bag front side and the back rear side, which are oppositely positioned in respective sides of the wafer case  12 . 
   An operation of the container packaging apparatus  10  according to an embodiment of the present invention will now be described with reference to flow sheets of  FIGS. 10 and 11 . 
   The bag stock carriage  13  loaded with a plurality of packaging bags is previously placed in the first stage S 1 . In this connection, the opening of each packaging bag  11  is directed toward the Y 2  direction and the end portion of the bag stock carriage  13  in the Y 2  side is positioned within the second stage S 2  zone. 
   Subsequently, the respective pickup pads  14  and both of the bag rear end fixing members  15  are simultaneously moved up/down by the elevating air cylinder  16   a  above the end of the second stage S 2  in its Y 1  side, so that the packaging bag  11 , specifically the bag placed on the top of the pile of packaging bags loaded on the bag stock carriage  13 , can be held by vacuum chuck and then lifted up at a region proximal to the opening ( FIG. 12 ). Immediately after this operation, the rod of the bag rear end chucking air cylinder  16   c  is retracted so as to cause the both bag rear end fixing members  15  to chuck the packaging bag  11  in the opening region. As in this condition, the elevating plate  16   b  is transferred to the Y 2  side of the second stage S 2  zone by the bag rear end fixing conveyer C 1  so that the packaging bag  11  that has been picked up can be transferred in its entirety to the second stage S 2  zone ( FIG. 13 ). 
   After that, both swing arms  17   b  are driven by respective associated swing motion actuating air cylinders  17   c  so as to make a swing motion to thereby place, in either side with respect to the tip portion (the opening region) of the packaging bag  11 , each corresponding to one of the tip side edge chuck members  18  in position. Next, by both of the chucking air cylinders  17   e , their associated upper and lower bag tip side edge chuck members  18  are moved in the direction to come closer to each other to thereby chuck the tip portion of the packaging bag  11  in both side portions thereof. To control the tension applied to the tip portion of the packaging bag  11 , the position control conveyer  17   d  is actuated so as to cause both swing arms  17   b  in association with the swing motion actuating air cylinders  17   c  to come closer to/part away from each other for controlling the tension. 
   In next operation, the rod of the bag rear end chuck air cylinder  16   c  is pushed out so as to release the chucking of the bag tip portion by the respective bag rear end fixing members  15 . Then, the elevating plate  16   b  is returned back to the Y 1  side end portion of the second stage S 2  by the bag rear end fixing conveyer C 1 . In this connection, the rod of the bag rear end chucking air cylinder  16   c  is again retracted so as for the upper and the lower bag rear end fixing members  15  to chuck the rear end portion of the packaging bag  11  ( FIG. 14 ). 
   Subsequently, in operation of the bag opening means  19 , both of the air cylinders  19   b  are actuated to push out the rods synchronously to thereby hold by vacuum chuck the upper and the lower sides of the packaging bag  11  in its opening region with two pairs of upper and lower opening pads  20 . Then, by the respective air cylinders  19   b , the associated rods are retracted synchronously so as to part the two pairs of upper and lower opening pads away from each other by a predetermined distance therebetween. Thus, the packaging bag  11  is opened in the site of the opening region ( FIG. 15 ). 
   Subsequently, in operation of the opening expansion means  33 , the rod of each air cylinder  71  is pushed out and the four expanding members  32  are inserted into the opened packaging bag  11  by the belt conveyer C 5  via the movable base frame  70  mounted thereon. Then, the rods of respective air cylinders  71  are retracted synchronously to thereby move the four expanding members  32  simultaneously in the radial directions from the approximately central location of the opening taken as the center. Thus, the opening of the packaging bag  11  would be expanded to a sufficiently large size to accommodate the wafer case  12  to be inserted ( FIG. 16 ). 
   Next operation is to insert the wafer case  12  into the packaging bag  11  ( FIG. 17 ) Specifically, in operation of the container insertion means  34 , the anchor table  36  is transferred in the Y 1  direction by the belt conveyer C 4 . Consequently, in the course of this transfer, the cover of the wafer case  12  is caught by a pair of container support bars  35 . Thus, the anchor table  36  is further moved in the Y 1  direction, while the wafer case  12  being held in the cantilever manner, to thereby transport the wafer case  12  into the second stage S 2  zone, where the wafer case  12  is inserted into the packaging bag  11  that has been opened in the site of the opening region. 
   After this operation, the container support bar  35  is pulled back to position by the belt conveyer C 4  of the container insertion means  34 . Further, in operation of the opening expansion means  33 , the rods of respective air cylinders  71  are pushed out synchronously so as to move the four expanding members  32  in the direction toward the approximately central location of the opening, while at the same time the respective expanding members  32  are withdrawn out of the packaging bag  11 . Additionally, in operation of the bag rear end chuck means  16 , the rod of the bag rear end chucking air cylinder  16   c  is pushed out to thereby release the chucking of the bag rear end portion ( FIG. 18 ). 
   Next, in operation of the creasing means  21 , the rods  22   a  of both of the air cylinders  22  are pushed out ( FIG. 7  and  FIG. 18 ). Accordingly, each of the ear folding and shaping bars  25  is driven to make a swing motion in a vertical plane around the pivot pin  23  to bring the ear folding and shaping bar  25  into abutment on the root of each triangular ear portions  11   a , where the ear folding and shaping bar  25  is pressed against the triangular ear portion in the fold-back side thereof. Consequently, prior to the opening of the packaging bag  11  being opened, the internal air within both of the triangular ear portions  11   a  is pressed out of the corresponding triangular ear portions  11   a.    
   As a result, in the subsequent step of carrying out the folding back operation of both triangular ear potions  11   a  onto the side surfaces of the container, base lines creased for the folding back (i.e., the folding-backlines) in the respective triangular ear portions  11   a  defined in the site of root portion thereof can be stable. Consequently, the triangular ear portions  11   a  in both sides of the bag rear end portion can emerge uniformly in size and shape and thus the packaging of the container with a resultant high level of quality can be provided in a stable manner. 
   After the folding back lines having been made, the rods of both of the air cylinders  22  are retracted to thereby rotate both ear folding and shaping bars  25  downward around the pivot pins  23  into their lying rest positions ( FIG. 19 ). Then, in operation of the bag rear end ear folding means  26 , the rods of both of the air cylinders  26   b  are pushed out synchronously. This operation can cause a swing motion of the vertical shaft  26   a  rotatably coupled to the tip portion of each rod, so that each of the ear folding plates  27  can fold back each triangular ear portion  11   a  creased with the folding back line in its root portion by the ear folding and shaping bar  25  to ride on the corresponding side surface of the case. 
   Next, the container transfer table  51  is moved from the second stage S 2  to the fourth stage S 4  by the belt conveyer C 2  between the second stage S 2  and the fourth stage S 4 . At that time, in operation of the case elevation means  60 , the output shafts  63  are rotated by both of the rotary motors  62  so as for the container clamping plates  64  to clamp the cover of the wafer case  12  loaded on the case carrier  50 . After that, the rods of both of the pickup cylinders  61  are retracted to thereby allow the wafer case  12  to be picked up a small distance from the case carrier  50 . 
   Subsequent to the transfer operation to the fourth stage S 4  zone, in operation of the side edge chuck means  28  of the container transfer table  51 , the both swing arms  29  are driven by both of the rotary motors  30  to make a swing motion around the horizontal shafts  29   a  ( FIG. 8  and  FIG. 20 ). This operation brings each pair of side edge chuck members  31  closer to the both side edges of the packaging bag  11  adjacent to the opening. Then, the rods of the air cylinders  31  are pushed out to cause each pair of side edge chuck members  31  to chuck the packaging bag  11  in both side edges between the side edge chuck members  31 . To control the tension applied to the opening region of the packaging bag  11 , a distance between the both rotating arms  29  can be changed by the arm position control conveyer C 3  for adjusting the tension. 
   Then, in operation of the container positioning means  41 , to seal the bag, the rod of the positioning air cylinder  42  is pushed out prior to the deaeration so as to bring the stopper plate  43  into abutment on the cover of the wafer case  12  in its Y 2  side from outside of the packaging bag  11  ( FIG. 9  and  FIG. 20 ). This can restrict the migration of the wafer case  12  to the Y 2  side within the bag during the subsequent deaeration work. As a result, the triangular ear portions  11   a  of the packaging bag  11  in the bag front end and the bag rear end can emerge as designed in size and shape and thus the packaging for the wafer case  12  with a higher level of quality can be provided. 
   Subsequently, in operation of the bag sealing means  37 , the tip portion of the deaeration nozzle  40  is inserted into the opening of the packaging bag  11  by the nozzle advancing and retracting air cylinder  39   a  ( FIG. 20 ). After that, as in the condition of the opening region of the packaging bag  11  being placed between the pressing bars  38   b , the rod of the pressing air cylinder  37   b  is protruded. This allows the both pressing bars  38   b  to clamp the opening region of the packaging bag  11  therebetween, and as in this condition, the deaeration of the bag is carried out by a negative pressure from the vacuum generator  39   b . After the deaeration operation having been completed, the tip portion of the deaeration nozzle  40  is withdrawn out of the bag by the nozzle advancing and retracting air cylinder  39   a , and the rod of the sealing air cylinder  37   a  is then protruded so as to apply a heat-sealing to the opening region of the packaging bag  11  clamed between both sealing bars  38   a  ( FIG. 21 ). During the heat-sealing operation, the pressing bars  38   b  provide the sealing across the entire bag opening, and so the opening region of the packaging bag  11  can be heat-sealed, as its having been evacuated of the air. 
   After that, in operation of the container positioning means  41 , the rod of the positioning air cylinder  42  is retracted to thereby part the stopper plate  43  away from the cover of the wafer case  12  ( FIG. 21 ). 
   Then, the wafer case  12  as contained in the bag that has been closed is placed on the transport conveyer C 6  by the case elevation means  60 . The wafer case is then transported from the fourth stage S 4  to the fifth stage S 5  by the transport conveyer C 6 . 
   In the fifth stage S 5 , the respective triangular ear portions  11   a  in the front and the rear end portions of the packaging bag  11  are folded on the side surfaces of the case by the bag front end ear folding means  44  and the bag rear end ear folding means  26 A, respectively ( FIG. 22 ). 
   After that, in operation of the tape attaching means  46 , a predetermined length of tape is fed from each of the tape dispensers  46   b  and then the rod of each of the tape air cylinder  46   a  is pushed out. By this operation, the adhesive tape  45  can be attached transversely across the both triangular ear portions  11   a  formed in either of the bag front side and the bag rear side as located oppositely on both side surfaces of the wafer case  12 . 
   As understood from the description above, since in the container packaging apparatus  10  of the illustrative embodiment of the present invention, both side ends of the opening of the packaging bag  11  are positioned and held in place by the side edge chuck means  28  during the deaeration operation, therefore the development of crimps in the sealed area of the packaging bag  11  can be suppressed, so that the high level of sealing property of the packaging bag  11  and thus the packaging of the wafer case  12  with the resultant high level of quality in the stable manner can be obtained. 
   In addition, since the migration of the wafer case  12  within the packaging bag  11  during the deaeration operation can be restricted with the aid of the container positioning means  41 , therefore the solution can be provided to eliminate the unevenness in size and shape between the left and the right triangular ear portions  11   a  in the front and the rear end portions of the packaging bag  11  resultant from the migration of the wafer case  12  within the packaging bag  11  during the deaeration operation. Consequently, it becomes possible to provide the packaging of the wafer case  12  with a much higher level of quality and the more stable manner.