JP2011067997A - Bag making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag making machine which manufactures an angular bottomed bag in a format different from a conventional format. <P>SOLUTION: The barrel material 1 of one layer is bent along a length direction bending line 8, so that the barrel materials 1 and 2 of each layer are opened, and their open surfaces are formed. The side gusset material 3 of one layer is bent by the bending part of the barrel material, the side gusset material 3 of each layer is opened, its auxiliary gusset 7 is opened, and an open surface is formed. Moreover, a bottom gusset material 4 is lapped over the barrel materials 1 and 2 and the open surface of the auxiliary gusset 7. In width directions of the barrel materials 1 and 2, the bottom gusset material 4, the auxiliary gusset 7, the barrel materials 1 and 2, and the side gusset material 3 are heat-sealed while the barrel materials 1 and 2 of each layer are opened. In addition, the bottom gusset material 4 and the barrel materials 1 and 2 are heat-sealed while the barrel materials 1 and 2 of each layer are opened in length directions of the barrel materials 1 and 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bag making machine for producing plastic bags.

  A plastic bag having a body part, a side gusset part and a bottom gusset part is used. An auxiliary gusset portion may be formed at one end of the side gusset portion, and the bottom gusset portion may be combined with the auxiliary gusset portion. This is called a square bottom bag. Prior to filing, the applicant developed and proposed a bag making machine that produces square bottom bags. This is described in Japanese Patent No. 3655627 (Patent Document 1).

  In the bag making machine of the publication, the upper and lower body members are overlapped with each other and intermittently fed in the length direction. The body is for forming the body of the plastic bag. Further, the side gusset material is folded in advance and overlapped in two layers, and the side gusset material is supplied to the body every time the body is intermittently fed. The side gusset material is for forming the side gusset portion and the auxiliary gusset portion of the plastic bag, and is arranged in the width direction of the trunk. Further, a side gusset material is inserted between the body members of each layer.

  Further, in the bag making machine disclosed in the publication, after the side gusset material is inserted, the body material of each layer is temporarily fixed to the side gusset material of each layer in the vicinity of one end of the side gusset material. Thereafter, in the vicinity of one end of the side gusset material, as the body material is fed, the upper body material is guided by the body material guide mechanism, and the upper material material is bent along the longitudinal fold line. The body is opened, its opening surface is formed, the upper side gusset material is pulled up and bent by the folding part of the body, the side gusset material of each layer is opened, its auxiliary gusset part is opened, the opening surface Is formed. Further, the lower body member is guided by the body member guide mechanism, the lower body member is bent along the longitudinal fold line, and a bottom gusset member is formed by the bent portion. And a bottom gusset material is arrange | positioned in the length direction of a trunk | drum, and it overlaps with the opening surface of a trunk | drum and an auxiliary | assistant gusset part, and a bottom gusset part is formed with a bottom gusset material.

  Further, the bottom gusset material is then folded back by the trunk guide mechanism, and the upper layer trunk is folded back. The bottom gusset material is folded along a longitudinal folding line, folded in two, and inserted between the body members of each layer. Thereafter, for each intermittent feed of the body, the body and the side gusset material are heat-sealed by the lateral sealing device in the width direction of the body. Further, for every intermittent feed of the body, the body and the bottom gusset material are heat-sealed by the vertical sealing device in the length direction of the body.

  However, in the case of the bag making machine disclosed in the publication, not only the upper body material is folded to form an open surface and the bottom gusset material is overlapped, but then the bottom gusset material is folded back by the body material guide mechanism, It is necessary to fold the material back and insert the bottom gusset material between the body members of each layer, which tends to complicate the body material guide mechanism. Therefore, it is also desired to manufacture square bottom bags in different ways.

  Accordingly, an object of the present invention is to provide a bag making machine that manufactures square bottom bags in a manner different from the conventional one.

  The other purpose is just to fold the body of one layer, form an open face, overlap the bottom gusset material, and then do not have to fold the bottom gusset material and fold back the body material of one layer There is in doing so.

Japanese Patent No. 3655627

  According to this invention, a plastic bag having a body portion, a side gusset portion, and a bottom gusset portion is formed, an auxiliary gusset portion is formed at one end of the side gusset portion, and the bottom gusset portion is combined with the auxiliary gusset portion. In the bag making machine, the upper and lower body members are overlapped with each other and intermittently fed in the length direction. The body is for forming the body of the plastic bag. Further, the side gusset material is folded in advance and overlapped in two layers, and the side gusset material is supplied to the body every time the body is intermittently fed. The side gusset material is for forming the side gusset portion and the auxiliary gusset portion of the plastic bag, and is arranged in the width direction of the trunk. Further, a side gusset material is inserted between the body members of each layer. Thereafter, in the vicinity of one end of the side gusset material, the body material of each layer is temporarily fixed to the side gusset material of each layer. Then, in the vicinity of one end of the side gusset material, with the feeding of the body material, the body material of one layer is guided by the material material guiding mechanism, and the material material of the one layer is bent along the longitudinal fold line, As a result, the body of each layer is opened, its opening surface is formed, the side gusset of one layer is folded by the folded part of the body, the side gusset of each layer is opened, and its auxiliary gusset is opened. An open surface is formed. Furthermore, the bottom gusset material overlapping mechanism is combined with it, the bottom gusset material is arranged in the longitudinal direction of the body, and is overlapped with the opening surface of the body and the auxiliary gusset, and the bottom gusset forms the bottom gusset. The Further, for every intermittent feed of the body material, the bottom gusset material and the auxiliary gusset portion, and the body material and the side gusset material are heat-sealed in a state where the body material of each layer is opened. Further, for every intermittent feed of the body, the bottom gusset material and the body are heat-sealed in a state where the body of each layer is opened in the length direction of the body.

  Further, in a preferred embodiment, after heat sealing, every time the body is intermittently fed, the bottom gusset material, the body material, and the side gusset material are cut in a state where the body material of each layer is opened in the width direction of the body material. .

  In addition, an additional guide mechanism is used as the bottom gusset material overlapping mechanism, and as the body is fed, the body of the other layer is guided by the additional guide mechanism, and the body of the other layer is aligned with the longitudinal fold line. Bend along. And the bottom gusset material is formed of the bending part.

  Further, a vertical seal bar and a plate are used in the vertical seal device, and the plate is inserted between the body of one layer and the bent portion. Then, the bottom gusset material and the body material are sandwiched between the vertical seal bar and the plate, and the bottom gusset material and the body material are heat sealed by the vertical seal bar and the plate.

FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a side view of the bag making machine of FIG. FIG. 3 is an explanatory view of a plastic bag manufactured by the bag making machine of FIG. FIG. 4 is an exploded view of the plastic bag of FIG. FIG. 5 is an enlarged view of another embodiment.

  Examples of the present invention will be described below.

  FIG. 1 shows a bag making machine according to the present invention. This bag making machine is for producing the plastic bag of FIG. Similar to that shown in Japanese Patent No. 3655627, the plastic bag shown in FIG. 3 has barrel portions 1, 2, side gusset portion 3 and bottom gusset portion 4, and as shown in FIG. 2 is overlapped in two layers, the side gusset portion 3 extends along both side edges 5 of the barrel portions 1 and 2, is folded between the barrels 1 and 2 of each layer, is folded in two, and is overlapped in the two layers. Yes. Further, the body parts 1 and 2 and the side gusset part 3 are heat-sealed along both side edges 5 of the body parts 1 and 2, and the heat seal line 6 is formed along both side edges 5 of the body parts 1 and 2. Has been. Further, as in the same publication, one end portion of the side gusset portion 3 is bent at an angle of 45 °, and an auxiliary gusset portion 7 is formed at one end portion of the side gusset portion 3.

  Further, in the plastic bag of the above publication, the bottom gusset portion 4 is folded between the body portions 1 and 2 of each layer and folded in two. In this plastic bag, the body portion 1 of one layer is folded in the width direction folding line 8. Are formed along this, thereby forming the open surfaces of the body portions 1 and 2 of the respective layers. Further, the side gusset portion 3 of one layer is bent along the folding line 9 in the width direction, whereby the side gusset portion 3 of each layer is opened, the auxiliary gusset portion 7 is opened, and an opening surface is formed. . And the bottom gusset part 4 is overlaid on the opening surfaces of the trunk parts 1, 2 and the auxiliary gusset part 7. Accordingly, the bottom gusset portion 4 is combined with the auxiliary gusset portion 7 in the same manner as in the publication, but the bottom gusset portion 4 is not folded between the body portions 1 and 2 of each layer, and is folded in two. It has not been. The auxiliary gusset portion 7 is not folded between the side gusset members 3 of each layer and is not folded in two.

  The bottom gusset part 4 is formed by bending the body part 2 of the other layer, and the body part 2 is bent along the widthwise fold line 10 as in the above publication. Furthermore, the free side edge 11 of the bottom gusset part 4 is aligned with the bottom edge 12 of the body part 1, and the bottom gusset part 4 and the auxiliary gusset part 7 are heat-sealed along the side edges 5 of the body parts 1 and 2, The heat seal line 6 is formed along both side edges 5 of the body parts 1 and 2, the bottom gusset part 4 and the body part 1 are heat sealed along its free side edge 11 and bottom edge 12, and the heat seal line 6 Are formed along the free side edge 11 and the bottom edge 12 of the bottom gusset part 4 and the body part 1.

  The bottom gusset part 4 and the body part 2 may be heat-sealed along the fold line 10 of the body part 2, and the heat seal line 6 may be formed along the fold line 10 of the body part 1.

  Therefore, similarly to the plastic bag of the above publication, this plastic bag can be expanded by the side gusset portion 3 to increase its capacity. A flat bottom surface can be formed by the bottom gusset portion 4 and can be stably upright.

  In the plastic bag manufacturing process of FIG. 3, the upper and lower body members 1, 2 are overlapped with each other and intermittently fed in the length direction in the bag making machine of FIG. The body materials 1 and 2 are for forming the body portions 1 and 2 of FIG. 3 and are made of a plastic film. In this embodiment, as shown in FIG. 2, feed rollers 13 and 14 are used in the body feed mechanism, and the upper body 1 is supplied from above and guided to the feed roller 13, and the lower body 2 is supplied in the horizontal direction, guided to the feed roller 13, and the body materials 1 and 2 of each layer are overlapped with each other. Further, the body materials 1 and 2 of each layer are guided to the feed roller 14, and the feed rollers 13 and 14 are rotated by the drive motor, so that the body materials 1 and 2 of each layer are intermittently fed in the length direction.

  Further, in this bag making machine, a side gusset material supply mechanism is specially provided, and the side gusset material 3 is folded in advance and overlapped in two layers. Is supplied to the barrels 1 and 2. The side gusset material 3 is for forming the side gusset portion 3 and the auxiliary gusset portion 7 of FIG. 3, is made of a plastic film, and is arranged in the width direction of the body materials 1 and 2. Further, the side gusset material 3 is inserted between the body materials 1 and 2 of each layer. In this embodiment, the double side width gusset material 3 is used as the side gusset material 3 in the same manner as in the bag making machine disclosed in the above publication, and is folded in two on both sides of the longitudinal center line and overlapped in two layers. Further, one end portion thereof is bent at an angle of 45 °, folded between the side gusset members 3 of each layer, folded in two, and superimposed on the two layers. As a result, the auxiliary gusset portion 7 is formed. Then, for each intermittent feed of the body materials 1 and 2, the side gusset material 3 is supplied to the lower body material 2, placed on the upper surface, and arranged in the width direction. The side gusset material supply mechanism is the same as that of the publication, and the description of the configuration is omitted.

  Furthermore, when the upper body 1 has a small width W1 and the lower body 2 has a large width W2, when the body 1 and 2 of each layer are overlapped with each other, the body In the width direction of 1 and 2, the one side edge 11 of the body material 2 exceeds the corresponding side edge 12 of the body material 1 and protrudes by a certain distance L, as in the above publication. The overhang distance L is determined by the difference (W2−W1) between the widths W1 and W2 of the body materials 1 and 2, and the overhang distance L is equal to the difference between the widths W1 and W2 (W2−W1). It is. Further, the side gusset material 3 is supplied to the lower body 2 and placed on the upper surface thereof, and its position and length correspond to the position and width of the upper body 1.

  Further, after the side gusset material 3 is inserted, the body materials 1 and 2 of each layer are temporarily fixed to the side gusset material 3 of each layer in the vicinity of one end of the side gusset material 3. In this embodiment, the point seal device 15 is used for the temporary fixing mechanism, and each time the body materials 1 and 2 are intermittently fed, in the vicinity of one end of the side gusset material 3, The side gusset material 3 is heat-sealed or ultrasonically sealed, the body material 1 of one layer adheres to the side gusset material 3 of one layer and is temporarily fixed, and the body material 2 of the other layer is the side of the other layer. It adheres to the gusset material 3 and is temporarily fixed. This is the same as that of the above publication.

  Further, after temporarily fixing the body materials 1 and 2, in the vicinity of one end of the side gusset material 3, the body material 1 of one layer is guided by the body material guide mechanism for each intermittent feed of the body materials 1 and 2. The layer body 1 is folded along a longitudinal fold line 8, thereby opening each layer body 1, 2 and forming an open surface thereof. In this embodiment, guide rollers 16, 17, 18, 19 and a plate 20 are used for the body guide mechanism, the body materials 1, 2 of each layer pass through the guide roller 16, and the upper body material 1 is the plate 20. The lower body 2 is guided to the guide roller 17 and once pulled down. Further, the upper body 1 passes through the plate 20, engages with the inclined side 21, is guided to the guide roller 18, and is near the one end of the side gusset material 3 by the inclined side 21 and the guide roller 18. 1 is guided and stands up. Further, it is guided to the guide roller 19, and the upper body material 1 is guided by the guide roller 19 and is completely bent. Thereby, the body materials 1 and 2 of each layer are opened, and the opening surface is formed. This is the same as that of the above publication.

  Furthermore, after temporarily fixing the body materials 1 and 2, the body material 1 of one layer is folded along the longitudinal fold line 8, but the body material 1 has a bending width that is half the overhanging distance L of the body material 2. The side gusset material 3 is bent and its width corresponds to the length of one end of the side gusset material 3 and corresponds to the length of the auxiliary gusset portion 7. Therefore, when the body material 1 of one layer stands up and is bent, the side gusset material 3 of one layer is pulled up by the bent portion, and is raised and bent. Further, the side gusset material 3 of the other layer is held by the body material 2 of the other layer, whereby the side gusset material 3 of each layer is opened, the auxiliary gusset portion 7 is opened, and an opening surface is formed. This is the same as that of the above publication.

  Furthermore, this bag making machine has a bottom gusset material overlapping mechanism. And the bottom gusset material 4 is arrange | positioned in the length direction of the trunk materials 1 and 2, and it overlaps with the opening surface of the trunk materials 1 and 2 and the auxiliary | assistant gusset part 7. FIG. In this embodiment, an additional guide mechanism is used as the bottom gusset material overlapping mechanism. As the body materials 1 and 2 are fed, the body material 2 of the other layer is guided and the material material 2 of the other layer is lengthened. The bottom gusset material 4 is formed by bending along the direction fold line 10. The body 2 is bent with a bending width corresponding to the overhang distance L. Accordingly, the bottom gusset material 4 is arranged in the length direction of the body materials 1 and 2 and overlapped with the opening surfaces of the body materials 1 and 2 and the auxiliary gusset portion 7, so that the bottom gusset portion 4 of FIG. It is formed. The bottom gusset material 4 has its free side edge 11 which is aligned with the corresponding side edge 12 of the body 1. Furthermore, in this embodiment, guide rollers 17, 19, 22, and 23 are used for the additional guide mechanism. As described above, the lower body 2 is guided to the guide roller 17 and once pulled down. After that, the lower body 2 is guided to the guide rollers 19 and 22, and is guided by the guide rollers 19 and 22. The lower body 2 is guided, bent, and stands up. Thereafter, the body materials 1 and 2 of each layer are guided to the guide roller 23 and pulled up again. The body materials 1 and 2 of each layer are guided by the guide roller 23 and the lower body material 2 is bent. Therefore, the bottom gusset material 4 is formed by the bent portion of the body material 2, and this is overlapped with the opening surfaces of the body materials 1, 2 and the auxiliary gusset portion 7. This is the same as that of the above publication.

  Furthermore, in the bag making machine disclosed in the above publication, the bottom gusset material 4 is folded and the upper body material 1 is folded back. However, in this bag making machine, the bottom gusset material 4 is not folded and the body material 1 is not folded back. . After the bottom gusset material 4 is overlaid, the bottom gusset material 4, the auxiliary gusset portion 7, the body materials 1, 2 and the bottom gusset material 4 are guided to the lateral sealing devices 24, 25, and the body materials 1, 2 are intermittently fed. Every time, in the width direction of the body materials 1 and 2, the bottom material 4 and the auxiliary gusset portion 7, and the body materials 1 and 2 and the side gusset material 3 are heat-sealed in a state where the body materials 1 and 2 of each layer are opened. . For example, a pair of horizontal seal bars 24 and 25 are used in the horizontal seal device, and the bottom material 4, the auxiliary gusset portion 7, the body materials 1 and 2, and the side gusset material 3 are sandwiched between the horizontal seal bars 24 and 25, The bottom gusset material 4 and the auxiliary gusset portion 7 are heat-sealed by the horizontal seal bars 24 and 25, and the body materials 1, 2 and the side gusset material 3 are also heat-sealed. Thereby, the heat seal line 6 of FIG. 3 is formed.

  Further, after that, the bottom gusset material 4 and the body materials 1 and 2 are guided to the vertical sealing devices 26, 27, 28 and 29, and in the longitudinal direction of the body materials 1 and 2 every intermittent feed of the body materials 1 and 2. The bottom gusset material 4 and the body materials 1 and 2 are heat-sealed with the body materials 1 and 2 of each layer being opened. For example, the vertical sealing device includes a vertical sealing bar 26, a plate 27, a cradle 28, and a vertical sealing bar 29. Then, the plate 27 is inserted between the body 1 of one layer and the bent portion, and the bottom gusset 4 and the body 1 near the free side edge 11 and the corresponding side edge 12 of the bottom gusset 4 and body 1. , 2 are sandwiched between the vertical seal bar 26, the plate 27 and the cradle 28. Therefore, the bottom gusset material 4 and the body 1 are sandwiched between the vertical seal bar 26 and the plate 27, and the bottom gusset material 4 and the body 1 are heat sealed by the vertical seal bar 26 and the plate 27. At the same time, the bottom gusset material 4 and the body 2 are sandwiched between the vertical seal bar 29 and the cradle 28 in the vicinity of the fold line 10 of the body 2, and the bottom gusset 4 and the body are separated by the vertical seal bar 29 and the cradle 28. The material 2 can also be heat sealed. Therefore, the bottom gusset material 4 and the body material 1 can be heat-sealed along the bottom gusset material 4 and the free side edge 11 and the corresponding side edge 12 of the body material 1. It is also possible to heat-seal along two fold lines 10. Thereby, the heat seal line 6 of FIG. 3 is formed.

  In this bag making machine, a laminate film obtained by laminating a sealant on a base material is used as the body materials 1 and 2 and the side gusset material 3, and in the upper and lower body materials 1 and 2 stacked, polyethylene, The inner surfaces of the barrels 1 and 2 are formed by a sealant such as polypropylene, and the outer surfaces of the barrels 1 and 2 are formed by a base material such as nylon. Further, in the side gusset material 3 in a folded state, the outer surface of the side gusset material 3 is formed by a sealant such as polyethylene or polypropylene, and the inner surface of the side gusset material 3 is formed by a base material such as nylon. Therefore, the bottom gusset material 4 and the auxiliary gusset portion 7 can be heat-sealed by the horizontal seal bars 24 and 25, and the body materials 1, 2 and the side gusset material 3 can be heat-sealed. The bottom gusset material 4 and the body 1 can be heat-sealed by the vertical seal bar 26, and the bottom gusset material 4 and the body 2 can be heat-sealed by the vertical seal bar 29.

  Thereafter, the bottom gusset material 4, the body materials 1 and 2, and the side gusset material 3 pass through the feed roller 14 and are guided to the cutter 30, and in the width direction of the body materials 1 and 2 every intermittent feed of the body materials 1 and 2. The bottom gusset material 4, the body materials 1, 2 and the side gusset material 3 are cut in a state where the body materials 1, 2 of each layer are opened. The cutting position is the position of the center line in the length direction of the side gusset material 3, and the bottom material 4, the body materials 1 and 2, and the side gusset material 3 are cut along the length direction center line of the side gusset material 3. . Thus, both side edges 5 of FIG. 3 are formed. Further, the fold lines 8 and 10 of FIG. 4 are formed by the fold lines 8 and 10 of the body materials 1 and 2, and the free side edge 11 and the corresponding side edge 12 of the bottom gusset material 4 and the body material 1 are free side of FIG. An edge 11 and a bottom edge 12 are formed.

  In the case of this bag making machine, the bottom gusset material 4 and the auxiliary gusset portion 7 and the body materials 1 and 2 and the side gusset material 3 are opened in the body 1 and 2 in the width direction of the body materials 1 and 2. As described above, the bottom gusset material 4 and the body materials 1 and 2 are heat-sealed in a state where the body materials 1 and 2 of each layer are opened in the length direction of the body materials 1 and 2. is there. Therefore, it is only necessary to bend the body material 1 of one layer to form an open surface and to overlap the bottom gusset material 4. As in the above publication, there is no need to fold back the bottom gusset material 4 and fold back the body 1 of one layer, and the body guide mechanism can be simplified.

  In this embodiment, one end portion of the side gusset material 3 is bent at an angle of 45 °, thereby forming the auxiliary gusset portion 7 and supplying the auxiliary gusset portion 7 to the lower body 2. This is not always necessary. As shown in FIG. 5, one end portion of the side gusset material 3 may not be bent and the auxiliary gusset portion 7 may not be formed, and it may be supplied to the lower body 2. Thereafter, as described above, the body materials 1 and 2 of each layer are temporarily fixed to the side gusset material 3 of each layer in the vicinity of one end of the side gusset material 3. Furthermore, after that, the body material 1 of one layer is folded along the longitudinal fold line 8, and the side gusset material 3 of one layer is folded by the bent portion. Thus, when folded, an auxiliary gusset portion can thereby be formed, and the auxiliary gusset portion can be opened to form an open surface. This is also as described in the above publication.

  Further, in this embodiment, the lower body material 2 is bent along the longitudinal fold line 10 and the bottom gusset material 4 is formed by the bent portion, but this is not necessarily required. The bottom gusset material supply mechanism is used as the bottom gusset material overlapping mechanism, and the bottom gusset material supply mechanism supplies the bottom gusset material, which is arranged in the length direction of the body materials 1 and 2, It is also conceivable to superimpose on the opening surface of the auxiliary gusset portion 7.

  Another configuration of a plastic bag is shown in Japanese Patent No. 4108846, and the plastic bag has two bottom gusset portions, and one of the two bottom gusset portions is arranged along the bottom edge of the trunk portion. The other gusset part extends along the top edge of the body part. Further, an auxiliary gusset portion is formed at one end of the side gusset portion, one gusset portion is combined therewith, an auxiliary gusset portion is formed at the other end portion of the side gusset portion, and the other gusset portion is combined therewith. Accordingly, when the plastic bag is filled with the contents, the plastic bag has a rectangular parallelepiped shape or a cubic shape and has a box-like appearance. In order to manufacture this plastic bag, in the vicinity of one end of the side gusset material 3, the body materials 1, 2 of each layer are temporarily fixed to the side gusset material 3 of each layer, and in the vicinity of the other end of the side gusset material 3, the body of each layer The materials 1 and 2 are temporarily fixed to the side gusset material 3 of each layer. Thereafter, in the vicinity of one end of the side gusset material 3, the body 1 of one layer is folded along the longitudinal fold line 8, thereby forming the opening surfaces of the body 1, 2 and the auxiliary gusset portion 7, The gusset material 4 is overlaid on the opening surface. Further, in the vicinity of the other end of the side gusset material 3, similarly, the body material of one layer is folded along the longitudinal fold line, thereby forming an opening surface of the body material and the auxiliary gusset portion, and the bottom gusset material Is superimposed on the opening. Then, in the width direction of the body, heat-seal the bottom gusset material and the auxiliary gusset part and the body and side gusset material in a state where the body of each layer is opened, and in the length direction of the body, The body is heat sealed with the body of each layer open. Thereafter, the bottom gusset material, the body material, and the side gusset material may be cut in a state in which the body material of each layer is opened in the width direction of the body material. As a result, the plastic bag disclosed in the publication can be manufactured. Of course, the bag making machine is also an embodiment of the present invention.

1, 2 Body 3 Side gusset material 4 Bottom gusset material 7 Auxiliary gusset portion 8, 10 Longitudinal fold line 13, 14 Feed roller 15 Point seal device 16, 17, 18, 19, 22, 23 Guide roller 20 Plate 24 , 25 Horizontal sealing device 26, 27, 28, 29 Vertical sealing device 30 Cutter

  The present invention relates to a bag making machine for producing plastic bags.

  A plastic bag having a body part, a side gusset part and a bottom gusset part is used. An auxiliary gusset portion may be formed at one end of the side gusset portion, and the bottom gusset portion may be combined with the auxiliary gusset portion. This is called a square bottom bag. Prior to filing, the applicant developed and proposed a bag making machine that produces square bottom bags. This is described in Japanese Patent No. 3655627 (Patent Document 1).

In the bag making machine disclosed in the publication, the upper and lower body members are superposed in two layers and intermittently fed in the length direction. The body is for forming the body of the plastic bag. Further, the side gusset material is folded in advance and overlapped in two layers, and the side gusset material is supplied to the body every time the body is intermittently fed. The side gusset material is for forming the side gusset portion and the auxiliary gusset portion of the plastic bag, and is arranged in the width direction of the trunk. Furthermore, a side gusset material is inserted between both layers of the trunk .

Further, in the bag making machine disclosed in the publication, after the side gusset material is inserted, in the vicinity of one end of the side gusset material, one body layer is temporarily fixed to one layer of the side gusset material, and the other layer of the body material Is temporarily fixed to the other layer of the side gusset material . Then, in the vicinity of one end of the side gusset material, with the feeding of the body material, one body layer is guided by the body material guiding mechanism, and one layer material of the body material is bent along the longitudinal fold line, As a result , both layers of the body material are opened, an opening surface is formed, and one side layer of the side gusset material is pulled up and bent by a bent portion of one layer of the body material, and both layers of the side gusset material are opened. Then, both layers of the auxiliary gusset portion are opened, and the opening surface is formed. Furthermore, the other layer of the trunk is guided by the trunk guide mechanism, the other layer of the trunk is bent along the longitudinal fold line, and the bottom gusset material is formed by the bent portion. And a bottom gusset material is arrange | positioned in the length direction of a trunk | drum, and it overlaps with the opening surface of a trunk | drum and an auxiliary | assistant gusset part, and a bottom gusset part is formed with a bottom gusset material.

Further, the bottom gusset material is then folded back by the trunk guide mechanism, and one layer of the trunk is folded back. The bottom gusset material is folded along a longitudinal folding line, folded in two, and inserted between the two layers of the trunk . Thereafter, for each intermittent feed of the body, the body and the side gusset material are heat-sealed by the lateral sealing device in the width direction of the body. Further, for every intermittent feed of the body, the body and the bottom gusset material are heat-sealed by the vertical sealing device in the length direction of the body.

However, when the bag making machine of the publication, folding one of the layers of the body member, the open surface is formed, not only superimpose the bottom gusset material, then folding the bottom gusset material by barrel material guide mechanism, cylinder It is necessary to fold back one layer of the material and insert the bottom gusset material between the two layers of the body material, and the body material guide mechanism may be complicated. Therefore, it is also desired to manufacture square bottom bags in different ways.

  Accordingly, an object of the present invention is to provide a bag making machine that manufactures square bottom bags in a manner different from the conventional one.

The other purpose is just to fold one layer of the body , form an open face and overlap the bottom gusset material, after which there is no need to fold the bottom gusset material and fold back one layer of the body There is in doing so.

Japanese Patent No. 3655627

The invention according to this application is two inventions. According to the first invention , the plastic bag has a body portion, a side gusset portion, and a bottom gusset portion, an auxiliary gusset portion is formed at one end of the side gusset portion, and the bottom gusset portion is combined with the auxiliary gusset portion. In the bag making machine for manufacturing the upper layer and the lower layer, the upper layer and the lower layer are superposed in two layers and intermittently fed in the length direction. The body is for forming the body of the plastic bag. Further, the side gusset material is folded in advance and overlapped in two layers, a side gusset material is formed by the side gusset material, one end of the side gusset material is bent at an angle of 45 °, and between the two layers of the side gusset material It is folded, folded in two, overlapped in two layers, an auxiliary gusset portion is formed at one end of the side gusset material, and then the side gusset material is supplied to the barrel every time the barrel is intermittently fed. The side gusset material is arranged in the width direction of the trunk. Furthermore, a side gusset material is inserted between both layers of the trunk . Thereafter, in the vicinity of one end of the side gusset material, one layer of the body material is temporarily fixed to one layer of the side gusset material, and the other layer of the body material is temporarily fixed to the other layer of the side gusset material . Then, in the vicinity of one end of the side gusset material, with the feeding of the body material, one body layer is guided by the body material guiding mechanism, and one layer material of the body material is bent along the longitudinal fold line, As a result , both layers of the body material are opened, an opening surface thereof is formed, one layer of the side gusset material is bent by one layer of the body material, both layers of the side gusset material are opened, and the auxiliary gusset portion Both layers are opened and the open face is formed. Furthermore, the bottom gusset material overlapping mechanism is combined with it, the bottom gusset material is arranged in the longitudinal direction of the body, and is overlapped with the opening surface of the body and the auxiliary gusset, and the bottom gusset forms the bottom gusset. The Further, at every intermittent feed of the body, in the width direction of the body, the bottom gusset material and the auxiliary gusset part, and the body and the side gusset material are heat-sealed in a state where both layers of the body are opened. Furthermore, at every intermittent feed of the body, the bottom gusset material and the body are heat-sealed in a state where both layers of the body are opened in the length direction of the body.

Further, in a preferred embodiment, after heat sealing, every time the body is intermittently fed, the bottom gusset material, the body material, and the side gusset material are cut in a state where both layers of the body material are opened in the width direction of the body material. The

Further, an additional guide mechanism is used as the bottom gusset material overlapping mechanism, and as the body is fed, the other layer of the body is guided by the additional guide mechanism, and the other layer of the body is in the longitudinal fold line. Bend along. And the bottom gusset material is formed of the bending part.

Further, a vertical seal bar and a plate are used in the vertical sealing device, and the plate is inserted between one layer of the body and the bent portion. Then, the bottom gusset material and the body material are sandwiched between the vertical seal bar and the plate, and the bottom gusset material and the body material are heat sealed by the vertical seal bar and the plate.

According to the second invention, one layer of the side gusset material is folded by one layer of the body material, both layers of the side gusset material are opened, and one end of the side gusset material is folded at an angle of 45 °, An auxiliary gusset portion is formed at one end portion of the side gusset material, and an opening surface thereof is formed.

FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a side view of the bag making machine of FIG. FIG. 3 is an explanatory view of a plastic bag manufactured by the bag making machine of FIG. FIG. 4 is an exploded view of the plastic bag of FIG. FIG. 5 is an enlarged view of another embodiment.

  Examples of the present invention will be described below.

  FIG. 1 shows a bag making machine according to the present invention. This bag making machine is for producing the plastic bag of FIG. Similar to that shown in Japanese Patent No. 3655627, the plastic bag shown in FIG. 3 has barrel portions 1, 2, side gusset portion 3 and bottom gusset portion 4, and as shown in FIG. 2 is overlapped in two layers, the side gusset portion 3 extends along both side edges 5 of the barrel portions 1 and 2, is folded between the barrels 1 and 2 of each layer, is folded in two, and is overlapped in the two layers. Yes. Further, the body parts 1 and 2 and the side gusset part 3 are heat-sealed along both side edges 5 of the body parts 1 and 2, and the heat seal line 6 is formed along both side edges 5 of the body parts 1 and 2. Has been. Further, as in the same publication, one end portion of the side gusset portion 3 is bent at an angle of 45 °, and an auxiliary gusset portion 7 is formed at one end portion of the side gusset portion 3.

Furthermore, in the plastic bag of the above publication, the bottom gusset portion 4 is folded between the two layers 1 and 2 of the trunk and folded in two. In this plastic bag, one layer 1 of the trunk is folded in the width direction folding line. bent along the 8, which both layers 1 and 2 of the body is opened by the opening surface of that is formed. Furthermore, one layer of the side gusset part 3 is bent along the widthwise fold line 9, whereby both layers of the side gusset part 3 are opened, the auxiliary gusset part 7 is opened, and an opening surface is formed. Yes. And the bottom gusset part 4 is overlaid on the opening surfaces of the trunk parts 1, 2 and the auxiliary gusset part 7. Therefore, the bottom gusset portion 4 is combined with the auxiliary gusset portion 7 in the same manner as that of the publication, but the bottom gusset portion 4 is not folded between the two layers 1 and 2 of the trunk portion. It is not folded. Auxiliary gusset portion 7 is also not folded between both layers of the side gusset material 3 has not been folded.

The bottom gusset portion 4 is formed by bending the other layer 2 of the body portion , and the other layer 2 of the body portion is bent along the widthwise fold line 10 as in the above publication. Furthermore, the free side edge 11 of the bottom gusset part 4 is aligned with the bottom edge 12 of the body part 1, and the bottom gusset part 4 and the auxiliary gusset part 7 are heat-sealed along the side edges 5 of the body parts 1 and 2, The heat seal line 6 is formed along both side edges 5 of the body parts 1 and 2, the bottom gusset part 4 and the body part 1 are heat sealed along its free side edge 11 and bottom edge 12, and the heat seal line 6 Are formed along the free side edge 11 and the bottom edge 12 of the bottom gusset part 4 and the body part 1.

  The bottom gusset part 4 and the body part 2 may be heat-sealed along the fold line 10 of the body part 2, and the heat seal line 6 may be formed along the fold line 10 of the body part 1.

  Therefore, similarly to the plastic bag of the above publication, this plastic bag can be expanded by the side gusset portion 3 to increase its capacity. A flat bottom surface can be formed by the bottom gusset portion 4 and can be stably upright.

In the manufacturing process of the plastic bag of FIG. 3, the upper and lower body materials 1, 2 are overlapped in two layers and intermittently fed in the length direction in the bag making machine of FIG. The body materials 1 and 2 are for forming the body portions 1 and 2 of FIG. 3 and are made of a plastic film. In this embodiment, as shown in FIG. 2, feed rollers 13 and 14 are used in the body feed mechanism, and the upper body 1 is supplied from above and guided to the feed roller 13, and the lower body 2 is supplied in the horizontal direction and guided to the feed roller 13 so that the upper and lower body materials 1 and 2 are superposed in two layers . Further, the upper and lower body materials 1 and 2 are guided to the feed roller 14, the drive rollers 13 and 14 are rotated by the drive motor, and the upper and lower body materials 1 and 2 are intermittently fed in the length direction. .

Further, in this bag making machine, a side gusset material supply mechanism is specially provided, and the side gusset material 3 is folded in advance in two layers and overlapped in two layers, and the side gusset material 3 forms the side gusset portion 3, Each time the body materials 1 and 2 are intermittently fed, the side gusset material 3 is supplied to the body materials 1 and 2. The side gusset material 3 is for forming the side gusset portion 3 and the auxiliary gusset portion 7 of FIG. 3, is made of a plastic film, and is arranged in the width direction of the body materials 1 and 2. Further, the side gusset material 3 is inserted between the two layers 1 and 2 of the body material . In this embodiment, the double side width gusset material 3 is used as the side gusset material 3 in the same manner as in the bag making machine disclosed in the above publication, and is folded in two on both sides of the longitudinal center line and overlapped in two layers. Further, one end portion is bent at an angle of 45 °, folded between both layers of the side gusset material 3 is folded, superimposed into two layers. As a result, the auxiliary gusset portion 7 is formed. Then, for each intermittent feed of the body materials 1 and 2, the side gusset material 3 is supplied to the lower body material 2, placed on the upper surface, and arranged in the width direction. The side gusset material supply mechanism is the same as that of the publication, and the description of the configuration is omitted.

Further, the upper body 1 has a small width W1, the lower body 2 has a large width W2, and the upper and lower bodies 1 and 2 are overlapped in two layers . At the same time, the one side edge 11 of the body material 2 extends beyond the corresponding side edge 12 of the body material 1 in the width direction of the body materials 1 and 2 and projects over a certain distance L, as in the above publication. The overhang distance L is determined by the difference (W2−W1) between the widths W1 and W2 of the body materials 1 and 2, and the overhang distance L is equal to the difference between the widths W1 and W2 (W2−W1). It is. Further, the side gusset material 3 is supplied to the lower body 2 and placed on the upper surface thereof, and its position and length correspond to the position and width of the upper body 1.

Furthermore, after the side gusset material 3 is inserted, in the vicinity of one end of the side gusset material 3, one layer 1 of the trunk is temporarily fixed to one layer of the side gusset 3, and the other layer 2 of the trunk is side gusset. It is temporarily fixed to the other layer of the material 3 . In this embodiment, the point seal device 15 is used for the temporary fixing mechanism, and each time the body materials 1 and 2 are intermittently fed, in the vicinity of one end of the side gusset material 3, The side gusset material 3 is heat-sealed or ultrasonically sealed , and one layer 1 of the body material is attached to one layer of the side gusset material 3 and temporarily fixed, and the other layer 2 of the body material is formed of the side gusset material 3. It adheres to the other layer 3 and is temporarily fixed. This is the same as that of the above publication.

Further, after temporarily fixing the body materials 1 and 2, in the vicinity of one end of the side gusset material 3, for each intermittent feed of the body materials 1 and 2 , one layer 1 of the body material is guided by the body material guide mechanism. one layer 1 is folded along the length folding lines 8, which both layers 1 and 2 of the body member is opened by the open surface is formed. In this embodiment, guide rollers 16, 17, 18, 19 and a plate 20 are used for the body guide mechanism, and both layers 1, 2 of the body pass through the guide roller 16, and one layer 1 of the body 1 Is guided to the plate 20 and temporarily pulled down, and the other layer 2 of the body is guided to the guide roller 17 and is temporarily pulled down. Further, as one of the layers 1 plate 20 of the body member, engages the inclined side 21 is guided by the guide roller 18, in the vicinity of one end of the side gusset material 3, cylinder member by the inclined edges 21 and the guide roller 18 One layer 1 is guided and stands up. Further, it is guided to the guide roller 19, and the guide roller 19 guides one layer 1 of the body , which is completely bent. As a result , both layers 1 and 2 of the body are opened, and the opening surface is formed. This is the same as that of the above publication.

Further, after the temporary fixing of the body member 1 and 2, one layer 1 of the body member is folded along the length folding lines 8, one layer 1 of the barrel material of the other layer 2 of Dozai overhang The side gusset member 3 is bent with a bending width that is half the distance L, and the bending width corresponds to the length of one end portion of the side gusset material 3 and corresponds to the length of the auxiliary gusset portion 7. Therefore, when one layer 1 of the body material stands up and is bent , one layer 1 of the body material pulls up one layer of the side gusset material 3 and stands up and bends. Furthermore, the other layer 2 of the side gusset material 3 is held by the other layer 2 of the body material , whereby both layers of the side gusset material 3 are opened, both layers of the auxiliary gusset portion 7 are opened, and the opening surface thereof is It is formed. This is the same as that of the above publication.

Furthermore, this bag making machine has a bottom gusset material overlapping mechanism. And the bottom gusset material 4 is arrange | positioned in the length direction of the trunk materials 1 and 2, and it overlaps with the opening surface of the trunk materials 1 and 2 and the auxiliary | assistant gusset part 7. FIG. In this embodiment, an additional guide mechanism is used as the bottom gusset material overlapping mechanism, and the other layer 2 of the body is guided and the other layer 2 of the body is lengthened as the bodies 1 and 2 are fed. The bottom gusset material 4 is formed by bending along the direction fold line 10. The other layer 2 of the body is bent with a bending width corresponding to the overhang distance L. Accordingly, the bottom gusset material 4 is arranged in the length direction of the body materials 1 and 2 and overlapped with the opening surfaces of the body materials 1 and 2 and the auxiliary gusset portion 7, so that the bottom gusset portion 4 of FIG. It is formed. The bottom gusset material 4 has its free side edge 11 which is aligned with the corresponding side edge 12 of the body 1. Furthermore, in this embodiment, guide rollers 17, 19, 22, and 23 are used for the additional guide mechanism. The other layer 2 of the body member is guided by the guide roller 17, but once lowered it is as described above, then the other layer 2 of the body member is guided by the guide rollers 19 and 22, the guide rollers The other layer 2 of the trunk is guided by 19 and 22, bent and raised. Thereafter, both layers 1 and 2 of the body are guided to the guide roller 23 and pulled up again , and both layers 1 and 2 of the body are guided by the guide roller 23, and the other layer 2 of the body is bent. Therefore, the bottom gusset material 4 is formed by the bent portion of the body material 2, and this is overlapped with the opening surfaces of the body materials 1, 2 and the auxiliary gusset portion 7. This is the same as that of the above publication.

Furthermore, in the bag making machine of the above publication, the bottom gusset material 4 is folded and one layer 1 of the body is folded back. However, in this bag making machine, the bottom gusset material 4 is not folded and one of the body materials is folded . Layer 1 is not folded back. After the bottom gusset material 4 is overlaid, the bottom gusset material 4, the auxiliary gusset portion 7, the body materials 1, 2 and the bottom gusset material 4 are guided to the lateral sealing devices 24, 25, and the body materials 1, 2 are intermittently fed. Every time, in the width direction of the body materials 1 and 2, the bottom material 4 and the auxiliary gusset portion 7 and the body materials 1 and 2 and the side gusset material 3 are heat-sealed in a state where both layers 1 and 2 of the body material are opened. The For example, a pair of horizontal seal bars 24 and 25 are used in the horizontal seal device, and the bottom material 4, the auxiliary gusset portion 7, the body materials 1 and 2, and the side gusset material 3 are sandwiched between the horizontal seal bars 24 and 25, The bottom gusset material 4 and the auxiliary gusset portion 7 are heat-sealed by the horizontal seal bars 24 and 25, and the body materials 1, 2 and the side gusset material 3 are also heat-sealed. Thereby, the heat seal line 6 of FIG. 3 is formed.

Further, after that, the bottom gusset material 4 and the body materials 1 and 2 are guided to the vertical sealing devices 26, 27, 28 and 29, and in the longitudinal direction of the body materials 1 and 2 every intermittent feed of the body materials 1 and 2. The bottom gusset material 4 and the body materials 1 and 2 are heat-sealed in a state where both layers 1 and 2 of the body material are opened. For example, the vertical sealing device includes a vertical sealing bar 26, a plate 27, a cradle 28, and a vertical sealing bar 29. Then, the plate 27 is inserted between one of the layers 1 of the body and the bent portion thereof, and the bottom gusset 4 and the body 1 near the free side edge 11 and the corresponding side edge 12 of the bottom gusset 4 and the body 1. , 2 are sandwiched between the vertical seal bar 26, the plate 27 and the cradle 28. Accordingly, the bottom gusset material 4 and one layer 1 of the body are sandwiched between the vertical seal bar 26 and the plate 27, and the bottom gusset material 4 and one layer 1 of the body are heat sealed by the vertical seal bar 26 and the plate 27. Is done. At the same time, the bottom gusset material 4 and the other layer 2 of the trunk are sandwiched between the vertical seal bar 29 and the cradle 28 in the vicinity of the fold line 10 of the other layer 2 of the trunk, and the vertical seal bar 29 and the cradle 28 28 can also heat seal the bottom gusset material 4 and the other layer 2 of the barrel. Therefore, the bottom gusset material 4 and the one layer 1 of the body can be heat-sealed along the free side edge 11 and the corresponding side edge 12 of the bottom gusset material 4 and the one layer 1 of the body. 4 and the other layer 2 of Dozai may be heat sealed along the fold line 10 of the other layer 2 of Dozai. Thereby, the heat seal line 6 of FIG. 3 is formed.

In this bag making machine, a laminate film obtained by laminating a sealant on a base material is used as the body materials 1 and 2 and the side gusset material 3, and in the upper and lower body materials 1 and 2 stacked, polyethylene, The inner surfaces of the barrels 1 and 2 are formed by a sealant such as polypropylene, and the outer surfaces of the barrels 1 and 2 are formed by a base material such as nylon. Further, in the side gusset material 3 in a folded state, the outer surface of the side gusset material 3 is formed by a sealant such as polyethylene or polypropylene, and the inner surface of the side gusset material 3 is formed by a base material such as nylon. Therefore, the bottom gusset material 4 and the auxiliary gusset portion 7 can be heat-sealed by the horizontal seal bars 24 and 25, and the body materials 1, 2 and the side gusset material 3 can be heat-sealed. The bottom gusset material 4 and one layer 1 of the trunk can be heat sealed by the vertical seal bar 26, and the bottom gusset material 4 and the other layer 2 of the trunk can be heat sealed by the vertical seal bar 29.

Thereafter, the bottom gusset material 4, the body materials 1 and 2, and the side gusset material 3 pass through the feed roller 14 and are guided to the cutter 30, and in the width direction of the body materials 1 and 2 every intermittent feed of the body materials 1 and 2. The bottom gusset material 4, the body materials 1, 2 and the side gusset material 3 are cut in a state where both layers 1, 2 of the body material are opened. The cutting position is the position of the center line in the length direction of the side gusset material 3, and the bottom material 4, the body materials 1 and 2, and the side gusset material 3 are cut along the length direction center line of the side gusset material 3. . Thus, both side edges 5 of FIG. 3 are formed. Further, the fold lines 8 and 10 of FIG. 4 are formed by the fold lines 8 and 10 of the body materials 1 and 2, and the bottom side gusset material 4 and the free side edge 11 and the corresponding side edge 12 of one layer 1 of the body material are illustrated. Four free side edges 11 and a bottom edge 12 are formed.

In the case of this bag making machine, both the layers 1 and 2 of the body of the bottom gusset material 4 and the auxiliary gusset portion 7 and the body materials 1 and 2 and the side gusset material 3 are opened in the width direction of the body materials 1 and 2. As described above, the bottom gusset material 4 and the body materials 1 and 2 are heat-sealed in a state where both layers 1 and 2 of the body material are opened in the length direction of the body materials 1 and 2. It is as follows. Therefore, it is only necessary to bend one layer 1 of the body material to form an open surface and to overlap the bottom gusset material 4. Then, as in the above publication, there is no need to fold back the bottom gusset material 4 and fold back one layer 1 of the body material, and the body material guide mechanism can be simplified.

In this embodiment, one end portion of the side gusset material 3 is bent at an angle of 45 °, thereby forming the auxiliary gusset portion 7 and supplying the auxiliary gusset portion 7 to the lower body 2. This is not always necessary. As shown in FIG. 5, one end portion of the side gusset material 3 may not be bent and the auxiliary gusset portion 7 may not be formed, and it may be supplied to the lower body 2. Thereafter, in the vicinity of one end of the side gusset material 3, one layer 1 of the body is temporarily fixed to one layer of the side gusset material, and the other layer 2 of the body is temporarily fixed to the other layer of the side gusset material 3. This is as described above. Further, after that, one layer 1 of the body material is folded along the longitudinal fold line 8, and one layer of the side gusset material 3 is folded by the one layer 1 of the body material . Therefore, when folded, the auxiliary gusset portion can be formed thereby and the opening surface thereof can be formed. This is also as described in the above publication.

Further, in this embodiment, the other layer 2 of the body material is bent along the longitudinal fold line 10 and the bottom gusset material 4 is formed by the bent portion. Absent. The bottom gusset material supply mechanism is used as the bottom gusset material overlapping mechanism, and the bottom gusset material supply mechanism supplies the bottom gusset material, which is arranged in the length direction of the body materials 1 and 2, It is also conceivable to superimpose on the opening surface of the auxiliary gusset portion 7.

Another configuration of a plastic bag is shown in Japanese Patent No. 4108846, and the plastic bag has two bottom gusset portions, and one of the two bottom gusset portions is arranged along the bottom edge of the trunk portion. The other gusset part extends along the top edge of the body part. Further, an auxiliary gusset portion is formed at one end of the side gusset portion, one gusset portion is combined therewith, an auxiliary gusset portion is formed at the other end portion of the side gusset portion, and the other gusset portion is combined therewith. Accordingly, when the plastic bag is filled with the contents, the plastic bag has a rectangular parallelepiped shape or a cubic shape and has a box-like appearance. In order to manufacture this plastic bag, in the vicinity of one end of the side gusset material 3, one layer 1 of the body is temporarily fixed to one layer of the side gusset 3, and the other layer 2 of the body is secured to the side gusset material. 3 is temporarily fixed to the other layer of the side gusset 3, and in the vicinity of the other end of the side gusset material 3, one layer 1 of the body is temporarily fixed to one layer of the side gusset 3, and the other layer 2 of the body is side-mounted Temporarily fix to the other layer of the gusset material 3 . Thereafter, in the vicinity of one end of the side gusset material 3, one of the layers 1 of the body is bent along the longitudinal fold line 8, thereby forming the opening surfaces of the bodies 1, 2 and the auxiliary gusset portion 7. The gusset material 4 is overlaid on the opening surface. Further, in the vicinity of the other end of the side gusset material 3, similarly, one layer of the body material is bent along the longitudinal fold line, thereby forming an opening surface of the body material and the auxiliary gusset portion, and the bottom gusset material. Is superimposed on the opening. Then, in the width direction of the body , heat-seal the bottom gusset material and the auxiliary gusset part and the body material and the side gusset material in a state where both layers of the body material are opened, and in the length direction of the body material, the bottom gusset material And heat seal the body with both layers of the body open. Thereafter, the bottom gusset material, the body material, and the side gusset material may be cut in a state in which both layers of the body material are opened in the width direction of the body material . As a result, the plastic bag disclosed in the publication can be manufactured. Of course, the bag making machine is also an embodiment of the present invention.

1, 2 Body 3 Side gusset material 4 Bottom gusset material 7 Auxiliary gusset portion 8, 10 Longitudinal fold line 13, 14 Feed roller 15 Point seal device 16, 17, 18, 19, 22, 23 Guide roller 20 Plate 24 , 25 Horizontal sealing device 26, 27, 28, 29 Vertical sealing device 30 Cutter

The invention according to this application is two inventions. According to the first invention, the plastic bag has a body portion, a side gusset portion, and a bottom gusset portion, an auxiliary gusset portion is formed at one end of the side gusset portion, and the bottom gusset portion is combined with the auxiliary gusset portion. In the bag making machine that manufactures, the two upper and lower body members are superimposed on two layers and intermittently fed in the length direction. The body is for forming the body of the plastic bag. In addition, the side gusset material is folded in advance and overlapped into two layers, a side gusset material is formed by the side gusset material, one end of the side gusset material is bent at an angle of 45 °, and between the two layers of the side gusset material It is folded, folded in two, overlapped in two layers, an auxiliary gusset portion is formed at one end of the side gusset material, and then the side gusset material is supplied to the barrel every time the barrel is intermittently fed. The side gusset material is arranged in the width direction of the trunk. Furthermore, a side gusset material is inserted between both layers of the trunk. Thereafter, in the vicinity of one end of the side gusset material, one layer of the body material is temporarily fixed to one layer of the side gusset material, and the other layer of the body material is temporarily fixed to the other layer of the side gusset material. Then, in the vicinity of one end of the side gusset material, with the feeding of the body material, one body layer is guided by the body material guiding mechanism, and one layer material of the body material is bent along the longitudinal fold line, As a result, both layers of the body material are opened, an opening surface thereof is formed, one layer of the side gusset material is bent by one layer of the body material, both layers of the side gusset material are opened, and the auxiliary gusset portion Both layers are opened and the open face is formed. Furthermore, the bottom gusset material overlapping mechanism is combined with it, the bottom gusset material is arranged in the longitudinal direction of the body, and is overlapped with the opening surface of the body and the auxiliary gusset, and the bottom gusset forms the bottom gusset. The Further, at every intermittent feed of the body, in the width direction of the body, the bottom gusset material and the auxiliary gusset part, and the body and the side gusset material are heat-sealed in a state where both layers of the body are opened. Furthermore, at every intermittent feed of the body, the bottom gusset material and the body are heat-sealed in a state where both layers of the body are opened in the length direction of the body. Further, after heat sealing, every time the body is intermittently fed, the bottom gusset material, the body material, and the side gusset material are cut in a state where both layers of the body material are opened in the width direction of the body material. Further, an additional guide mechanism is used as the bottom gusset material overlapping mechanism, and as the body is fed, the other layer of the body is guided by the additional guide mechanism, and the other layer of the body is in the longitudinal fold line. Bend along. And the bottom gusset material is formed of the bending part.

In a preferred embodiment , a vertical seal bar and plate are used in the vertical seal device, and the plate is inserted between one layer of the body and its fold. Then, the bottom gusset material and the body material are sandwiched between the vertical seal bar and the plate, and the bottom gusset material and the body material are heat sealed by the vertical seal bar and the plate.

The invention according to this application is two inventions. According to the first aspect of the present invention, the side gusset portion has a trunk portion, a side gusset portion, and a bottom gusset portion, an auxiliary gusset portion is formed at one end of the side gusset portion, and the bottom gusset portion and the auxiliary gusset portion are heat-sealed. A bag making machine for producing plastic bags,
The two upper and lower body members are superposed in the width direction so that the other layer protrudes a certain distance from one layer, and intermittently fed in the length direction. A body feed mechanism to be formed;
A side gusset material forming the side gusset portion, which is folded in advance and overlapped with two layers, and one end portion thereof is bent at an angle of 45 °, and the auxiliary gusset portion is folded between both layers of the side gusset material. A side gusset material supply mechanism for supplying the side gusset material on the lower layer of the body material for each intermittent feed of the body material, and arranging the side gusset material in the width direction of the body material;
Supplying the side gusset material, after overlapping the upper layer and the lower layer of the body, in the vicinity of one end of the side gusset material, temporarily fix one layer of the side gusset material to the upper layer of the body, A temporary fixing mechanism for temporarily fixing the other layer of the side gusset material to the lower layer of the body;
After the temporary fixing, as the body is fed, one layer of the body is guided, bent along a longitudinal fold line, thereby forming an opening surface of the body, and the auxiliary A body guide mechanism that bends one layer of the gusset portion and thereby forms an open surface of the auxiliary gusset portion;
As the body is fed, the other layer of the body is guided, the other layer of the body is folded along a longitudinal fold line, and is overlapped with the opening surface of the body and the auxiliary gusset portion. An additional guide mechanism that forms the bottom gusset portion by the bent portion;
For each intermittent feed of the body, in the width direction of the body, the bottom gusset part, the auxiliary gusset part, and the body and the side gusset material are heat-sealed in a state where an opening surface of the body is formed. A sealing device;
For each intermittent feed of the body, in the length direction of the body, a vertical sealing device that heat-seals the bottom gusset portion and the body in a state where an open surface of the body is formed;
After heat sealing, for each intermittent feed of the body, in the width direction of the body, from the cutter that cuts the bottom gusset part, the body and the side gusset material in a state in which the open surface of the body is formed A bag making machine is provided.

According to the second aspect of the present invention , the side gusset portion has a trunk portion, a side gusset portion, and a bottom gusset portion, and an auxiliary gusset portion is formed at one end of the side gusset portion, and the bottom gusset portion and the auxiliary gusset portion are heat sealed. A bag making machine for producing plastic bags,
The two upper and lower body members are superposed in the width direction so that the other layer protrudes a certain distance from one layer, and intermittently fed in the length direction. A body feed mechanism to be formed;
A side gusset material for forming the side gusset portion, the side gusset material folded in advance and overlapped in two layers is supplied to the lower layer of the body for each intermittent feed of the body, A side gusset material supply mechanism that arranges the side gusset material in the width direction of the body;
Supplying the side gusset material, after overlapping the upper layer and the lower layer of the body, in the vicinity of one end of the side gusset material, temporarily fix one layer of the side gusset material to the upper layer of the body, A temporary fixing mechanism for temporarily fixing the other layer of the side gusset material to the lower layer of the body;
After the temporary fixing, as the body is fed, one layer of the body is guided and bent along a longitudinal fold line, thereby forming an open surface of the body, and the side A body guide mechanism that bends one end portion of the gusset material at an angle of 45 ° and forms the auxiliary gusset portion and an opening surface thereof at one end portion of the side gusset material;
As the body is fed, the other layer of the body is guided, the other layer of the body is folded along a longitudinal fold line, and is overlapped with the opening surface of the body and the auxiliary gusset portion. An additional guide mechanism that forms the bottom gusset portion by the bent portion;
For each intermittent feed of the body, in the width direction of the body, the bottom gusset part, the auxiliary gusset part, and the body and the side gusset material are heat-sealed in a state where an opening surface of the body is formed. A sealing device;
For each intermittent feed of the body, in the length direction of the body, a vertical sealing device that heat-seals the bottom gusset portion and the body in a state where an open surface of the body is formed;
After heat sealing, for each intermittent feed of the body, in the width direction of the body, from the cutter that cuts the bottom gusset part, the body and the side gusset material in a state in which the open surface of the body is formed A bag making machine is provided.

Claims (4)

A bag making for producing a plastic bag having a body part, a side gusset part and a bottom gusset part, wherein an auxiliary gusset part is formed at one end of the side gusset part, and the bottom gusset part is combined with the auxiliary gusset part Machine,
A body feeding mechanism that superimposes the upper and lower body bodies on each other, intermittently feeds them in the length direction, and forms the body part with the body parts;
Side gusset material is folded in advance, overlapped in two layers, and for each intermittent feed of the body, the side gusset material is supplied to the body, and the side gusset material is disposed in the width direction of the body. A side gusset material supply mechanism in which the side gusset material is inserted between the body members of the respective layers, and the side gusset portion and the auxiliary gusset portion are formed by the side gusset material,
After the insertion of the side gusset material, in the vicinity of one end of the side gusset material, a temporary fixing mechanism for temporarily fixing the body material of each layer to the side gusset material of each layer;
After temporarily fixing the body, in the vicinity of one end of the side gusset material, as the body is fed, the body of one layer is guided, and the body of the one layer is moved along the longitudinal fold line. And then opening the body material of each layer, forming an opening surface thereof, folding the side gusset material of one layer by the folded part of the body material, opening the side gusset material of each layer, and opening the auxiliary gusset part. A body guide mechanism that opens and forms an open surface;
The bottom gusset material is arranged in the length direction of the body material, overlapped on the opening surfaces of the body material and the auxiliary gusset portion, and the bottom gusset material is formed by the bottom gusset material. Mechanism,
A transverse seal that heat-seals the bottom gusset material, the auxiliary gusset portion, the body material, and the side gusset material in a state where the body material of each layer is opened in the width direction of the body material every intermittent feed of the body material. Equipment,
A bag making machine comprising a longitudinal sealing device that heat-seals the bottom gusset material and the body member in a state in which the body member of each layer is opened in the longitudinal direction of the body member every intermittent feed of the body member.   After heat sealing, for each intermittent feed of the body, in the width direction of the body, provided with a cutter for cutting the bottom gusset material, the body material and the side gusset material in a state where the body material of each layer is opened. The bag making machine according to claim 1.   An additional guide mechanism is used as the bottom gusset material overlapping mechanism, and as the body is fed, the body of the other layer is guided by the additional guide mechanism, and the body of the other layer is bent in the length direction. The bag making machine according to claim 1, wherein the bottom gusset material is formed by bending along a line.   The vertical seal device includes a vertical seal bar and a plate, the plate is inserted between the body of the one layer and the bent portion, and the bottom gusset material and the body are sandwiched between the vertical seal bar and the plate. The bag making machine according to claim 1, wherein the bottom gusset material and the body are heat-sealed by the vertical seal bar and the plate.

Images