JP5969449B2 - Self-supporting packaging bag with side gusset and manufacturing method thereof - Google Patents

Description

  The present invention relates to a self-supporting packaging bag with side gussets and a method for manufacturing the same, and more specifically, includes a front side sheet, a back side sheet, and a pair of side gussets respectively joined to both sides of the front side sheet and the back side sheet. When a product is stored, a side gusset, a front sheet, and a back sheet are developed to form a front surface portion, a back surface portion, and a bottom surface portion. About.

  Conventionally, as a self-supporting packaging bag with a side gusset, a front side sheet, a back side sheet, and a pair of side gussets respectively bonded to both sides of the front side sheet and the back side sheet, In some cases, the lower part is formed by being joined via a side gusset (see, for example, Patent Document 1).

  In addition, the front side sheet, the back side sheet, and a pair of side gussets respectively bonded to both sides of the front side sheet and the back side sheet, the bottom sheet forming the bottom surface part is integrally folded at the lower part of the front side sheet. The side gusset is also provided with a triangular flap forming part for bending the lower part of the folded sheet at an angle of 45 degrees and forming the corners of the bottom part into a square shape. (For example, refer to Patent Document 2).

JP 2005-200067 A Japanese Patent No. 3655627

  However, in the thing of patent document 1, when the contents are accommodated, as shown in FIG. 16 of the present application, the side gusset 21, the front side sheet 22, and the back side sheet 23 develop, and the front surface portion 24a and the back surface The portion 24b and the bottom surface portion 24c are formed and can stand on their own, but since the lower portions of the front side sheet 22 and the back side sheet 23 are joined, the joint portion 25 that protrudes downward at the center of the bottom surface portion 24c. As a result, the stability of the self-standing bag was not good.

  Moreover, in the thing of patent document 2, although the bottom face part was formed in planar shape, since the bottom face sheet was integrally provided in the lower part of the front side sheet | seat, the bag making machine was enlarged. Further, since the triangular flap forming part is folded at the lower part of the side gusset, it takes time and effort to form the side gusset, and the cost is high. Furthermore, although the front side sheet and the bottom sheet are integrated, it is difficult to form a decorative part that is continuous with the front surface part, the bottom surface part, and the back surface part because the back side sheet is a separate body.

  Therefore, the present invention is a self-standing with a side gusset that has a flat bottom surface when the contents are stored, can improve stability, can be reduced in cost, and is excellent in design. It aims at providing a mold packaging bag and its manufacturing method.

In order to achieve the above object, the front side sheet, the back side sheet, and the front side sheet and a pair of side gussets respectively bonded to both sides of the back side sheet are provided, and when the contents are stored, the side gusset and the front side In the self-supporting packaging bag with a side gusset in which the sheet and the back sheet are developed to form a front surface portion, a back surface portion, and a bottom surface portion, the front sheet and the back sheet are a single sheet material. The side gusset is formed in a double fold from the folded portion of the sheet material to the bag opening side, with the mountain fold side facing the bag inside, and the back sheet and the upper and lower ends of the side gusset comprising a sealing tape for joining the bets, when the storing contents, together with said side gusset and front sheet and the back sheet to expand, the folded portion side gusset Folded inside the bag in a triangular flap shape, the folded portion side of the front sheet and the folded portion side of the back sheet are folded so as to be in the same plane, the front surface portion, the back surface portion, and the bottom surface portion Is formed.

Further, it is preferable that a chuck is provided in the opening. Furthermore, it becomes a fold when the bottom surface portion is formed at the boundary position between the front surface portion and the bottom surface portion of the front sheet and the boundary position between the back surface portion and the bottom surface portion of the back sheet. It is preferable that each rib is provided. Further, when the bottom surface portion is formed at the boundary position between the top surface portion and the bottom surface portion of the front side sheet and the boundary position between the back surface portion and the bottom surface portion of the back side sheet, the outer side surfaces are mutually outside. A knob for pulling may be provided. Further, two corners of the folded portion side and the front side sheet and the back side sheet and the side gusset is polymerization, may width gradually becomes narrower at a 45 degree angle toward the folded side. Further, it is preferable that a series of continuous decorative portions are provided on the front surface portion, the back surface portion, and the bottom surface portion.

  Further, in the method for manufacturing a self-supporting packaging bag with side gussets of the present invention, the front side sheet, the back side sheet, and a pair of side gussets respectively bonded to both sides of the front side sheet and the back side sheet are provided. In the method for manufacturing a self-supporting packaging bag with a side gusset, the side gusset, the front sheet, and the back sheet are expanded to form a front surface portion, a back surface portion, and a bottom surface portion. A sheet material feeding step of feeding a sheet material and placing the upper half of the sheet material on the lane of the bag making machine, and the upper half of the sheet material sent to the bag making machine For side gussets, the band-shaped side gusset sheets folded in a kannon are temporarily placed at a predetermined interval in the up and down direction of the sheet material with the pair of folded pieces facing the front side. A sealing tape having thermal adhesiveness is disposed on each of the upper and lower ends of the sheet mounting step and the temporarily bonded side gusset sheet, and the sealing tape and the sheet material are heat sealed. A sealing tape attaching step, a sheet material folding step in which the lower half of the sheet material is folded and overlapped to the upper half side, and a central portion of the side gusset sheet that has been folded in a closed state, It has the joining process which heat seals and joins the said front side sheet and the said back side sheet | seat, and the cutting process which cuts the width direction center part of the heat seal part formed at this joining process, It is characterized by the above-mentioned.

  Further, it is preferable that the sheet material is formed by extruding a pair of chuck portions that mesh with each other in the longitudinal direction on the upper side of the upper half and the longitudinal direction on the lower side of the lower half. Further, the sealing tape sealed to the upper end portion of the side gusset sheet is formed of one chuck tape of a pair of chuck tapes having a male-female engagement portion on the front surface and a back surface serving as a sealing surface, The other chuck tape may be sealed on the lower side of the lower half of the sheet material. In addition, the sheet material is formed with ribs that become folds when the bottom surface portion is folded and formed in the longitudinal direction on the lower side of the upper half and the longitudinal direction on the lower side of the lower half. It is preferable that Further, the sheet material is formed by pulling the bottom portion to the outside when the bottom portion is folded in the longitudinal direction on the lower side of the upper half and the longitudinal direction on the lower side of the lower half. You may form the knob | pick part which forms a part. In addition, after the cutting step, the two corners on the folded portion side where the front sheet, the back sheet, and the side gusset are overlapped, an angle of 45 degrees so that the width gradually decreases toward the folded portion side. It is preferable to provide a corner machining step for joining and cutting at the same time. Furthermore, it is preferable that the sheet material is formed with a series of decorative portions that are continuous in the vertical direction.

  According to the self-supporting packaging bag with side gussets of the present invention, the front side sheet and the back side sheet are formed by folding one sheet material, and as in the conventional case, for forming a triangular flap at the lower part of the side gusset. Since it is not necessary to provide the folding portion, the number of manufacturing steps can be reduced, and the cost can be reduced. In addition, when the contents are stored, the side gusset, the front side sheet, and the back side sheet are unfolded, so that the side gusset is folded into the inside of the bag in the shape of a triangular flap, and the front side sheet and the back side sheet turn-back side Are bent so as to be in the same plane, and the front surface portion, the back surface portion, and the bottom portion of the planar square shape are easily formed, and the packaging bag can be made to stand in a stable state.

  Moreover, by providing the opening with a chuck, a good packaging bag having a reusable function can be formed, and the contents can be stored in a good state. Furthermore, ribs serving as creases when the bottom surface portion is formed are respectively provided at the boundary position between the front surface portion and the bottom surface portion of the front sheet and the boundary position between the back surface portion and the bottom surface portion of the back sheet. For this reason, when the contents are stored, the bottom portion can be satisfactorily formed with the rib as a boundary. In addition, when the bottom surface portion is formed at the boundary position between the front surface portion and the bottom surface portion of the front side sheet and the boundary position between the back surface portion and the bottom surface portion of the back sheet, a knob portion is provided for pulling outward. Thus, when the contents are accommodated, the bottom portion can be satisfactorily formed by pulling the knob portion outward. Furthermore, by joining and cutting the two corners on the folded portion side where the front side sheet, the back side sheet, and the side gusset are overlapped at an angle of 45 degrees so that the width gradually decreases toward the folded portion side, When the contents are accommodated, the side gusset on the corner portion side is folded into the inside of the bag well in a triangular flap shape, and the bottom surface portion can be formed easily and nicely. Further, the design can be improved by providing a series of continuous decorative portions on the front surface portion, the back surface portion, and the bottom surface portion.

  Furthermore, according to the method for manufacturing a self-supporting packaging bag with side gussets according to the present invention, the side gusset sheet is only folded, and it does not take time to manufacture the side gusset sheet, and the yield is improved. Can be achieved. In addition, since one sheet material is folded into the front side sheet and the back side sheet, the number of heat sealing steps can be reduced, and the cost can be reduced.

  In addition, since the sheet material is formed by extruding the chuck portions that engage with each other in the longitudinal direction of the upper half of the upper half and the longitudinal direction of the lower half of the lower half, the chuck is easily formed. be able to. Further, the sealing tape sealed to the upper end portion of the side gusset sheet is formed by one chuck tape of a pair of chuck tapes having a male-female engagement portion on the front surface and a back surface serving as a sealing surface, Since the other chuck tape is sealed on the lower side of the lower half, the one tape can be used as the sealing tape, and the cost can be reduced. In addition, the sheet material is formed with a rib that becomes a fold when the bottom surface portion is folded and formed in the longitudinal direction on the lower side of the upper half and the longitudinal direction on the lower side of the lower half. Therefore, a signature for forming the bottom surface portion can be easily formed. Further, the sheet material is formed by folding the bottom surface portion in the longitudinal direction on the lower side of the upper half portion and the longitudinal direction on the lower side of the lower half portion, thereby pulling the bottom surface portion toward each other. Since the knob part to be formed is formed, a knob part for favorably forming the bottom surface part when the contents are accommodated can be easily formed. In addition, after the cutting step, the two corners on the folded portion side where the front sheet, the back sheet, and the side gusset overlap are joined at an angle of 45 degrees so that the width gradually decreases toward the folded portion side. By having a corner processing step to cut, when the contents are stored, the side gusset on the corner side is folded into the inside of the bag well in a triangular flap shape, and the bottom part is formed easily and nicely Packaging bags can be manufactured. Moreover, since a series of decoration parts which are continuous in the vertical direction are formed on the sheet material, the design can be improved by a simple method.

It is a front view of the packaging bag which shows the 1st form example of this invention. It is II-II sectional drawing of FIG. It is sectional drawing of the use condition of the packaging bag which shows the 1st form example of this invention. It is a perspective view of use condition similarly. It is a disassembled perspective view of a packaging bag similarly. It is a disassembled perspective view of the packaging bag which shows the 2nd form example of this invention. It is a disassembled perspective view of the packaging bag which shows the 3rd form example of this invention. It is a disassembled perspective view of the packaging bag which shows the 4th form example of this invention. It is a perspective view of the packaging bag which shows the 5th form example of this invention. It is a front view of the packaging bag which shows the 6th form example of this invention. It is a perspective view of the packaging bag which shows the 7th form example of this invention. It is the schematic which shows the manufacturing method of the packaging bag of this invention. It is explanatory drawing which similarly shows the manufacturing method of a packaging bag. It is explanatory drawing which shows the sheet | seat for side gussets of this invention. It is an expanded view of the packaging bag which shows the 2nd form example of this invention. It is a perspective view of the conventional packaging bag.

  1 to 5 are views showing a self-supporting packaging bag with side gussets (hereinafter referred to as a packaging bag) showing a first embodiment of the present invention. As shown in FIGS. 1 and 2, the packaging bag 1 is formed by folding a single sheet material 2 to form a front sheet 2a and a back sheet 2b, and on both sides of the front sheet 2a and the back sheet 2b, The side gussets 3 and 3 folded in half are joined from the folded portion 2c of the sheet material 2 to the bag opening side with the mountain fold portion 3a facing the inside of the bag.

  The sheet material 2 is formed of a well-known composite film having a non-adhesive layer on one side and a heat-adhesive layer on the other side, and the side gusset 3 is also formed of a similar composite film. The side gusset 3 has a non-adhesive layer. Folded inward.

  The back side sheet 2b and the upper and lower ends of the side gussets 3 and 3 are joined together with the first sealing tape 4 on the folded portion side and the second sealing tape 5 on the opening side. Moreover, the lower end part of the side gusset 3 is joined by the 1st sealing tape 4 in the state which protruded slightly on the front side sheet | seat 2a side rather than the folding | turning part 2c of the sheet | seat material 2, and the front side sheet | seat 2a and the back side sheet | seat 2b The side gusset 3 is arranged so as to be surely disposed without a gap therebetween.

  Furthermore, the folded back front sheet 2a is arranged on the back sheet 2b and the side gussets 3 and 3 joined to the back sheet 2b, and both sides of the back sheet 2b and both sides of the front sheet 2a Heat sealing is performed with the gussets 3 and 3 interposed. Thereby, the outer surface upper end part and outer surface lower end part of one half 3b of the side gusset 3 folded in half are on the back side sheet 2b, and the outer surface upper end part and outer surface lower end part of the other half body 3c are on the front side sheet 2a. The inner surfaces of one half 3b and the other half 3c of the side gusset 3 are in an unbonded state.

  When the contents are accommodated in the thus formed packaging bag 1, as shown in FIGS. 3 and 4, the side gussets 3, 3, the front side sheet 2a, and the back side sheet 2b are expanded, whereby the folded portion 2c. The side gussets 3 and 3 are folded inside the bag in a triangular flap shape, and the folded portion 2c side of the front sheet 2a and the folded portion 2c side of the back sheet 2b are folded so as to be flush with each other. A portion 6a, a back surface portion 6b, and a bottom surface portion 6c are formed. Thereby, the packaging bag 1 can become independent. Moreover, the opening part of the packaging bag 1 after being filled with the contents is sealed, and an opening seal part 6d is formed.

  In the present embodiment, as described above, the front side sheet 2a and the back side sheet 2b are formed by folding one sheet material 2, and at the bottom of the side gussets 3 and 3, a triangular flap is formed as in the conventional case. Therefore, the manufacturing process can be reduced and the cost can be reduced. Further, when the contents are stored, the side gussets 3, 3 and the front side sheet 2a and the back side sheet 2b are unfolded so that the side gussets 3, 3 are folded into the inside of the bag in a triangular flap shape, and the front side sheet 2a and the folded portion side of the back sheet 2b are bent so that they are flush with each other, the plane square bottom surface portion 6c is easily formed by filling the contents, and the packaging bag is stable. 1 can be made independent.

  FIGS. 6 to 11 show other embodiments of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. .

  FIG. 6 shows a second embodiment of the present invention. In this embodiment, the upper part of the upper half of the sheet material 2 and the width of the lower part of the lower half are engaged with each other. The chuck portions 7a and 7b are formed by extrusion. Thereby, the chuck | zipper is formed in the upper part of the packaging bag 1, and the favorable packaging bag 8 which has a recloseable function can be formed.

  FIG. 7 shows a third embodiment of the present invention. In the boundary position between the front surface portion 6a and the bottom surface portion 6c of the front side sheet 2a and the boundary position between the back surface portion 6b and the bottom surface portion 6c of the back side sheet 2b. In addition, ribs 9 are provided as creases when the bottom surface portion 6c is formed. Thereby, when the contents are stored in the packaging bag 10 of the present embodiment, the bottom surface portion 6c can be satisfactorily formed with the ribs 9 and 9 as a boundary.

  FIG. 8 shows a fourth embodiment of the present invention. The first chuck tape 11a is heat-sealed on the upper side of the sheet material 2, and the second chuck tape 11b is heat-sealed on the lower side. The first chuck tape 11a has a male occlusal portion 11c formed on the surface, and both surfaces are thermal adhesive layers. Instead of the second sealing tape 5 used in the first embodiment, the back sheet 2b and the side The back side sheet 2b and the side gussets 3 and 3 are joined to each other by the first chuck tape 11a. The second chuck tape 11b has a female-side occlusion portion 11d that engages with the male-side occlusion portion 11c on the surface, and both surfaces are heat-bonding layers, and heat sealing is performed at a predetermined position on the lower side of the sheet material 2. Has been. Thereby, a chuck | zipper is formed in the upper part of the packaging bag 12 of this embodiment.

  FIG. 9 shows a fifth embodiment of the present invention, and a series of decorative portions 13 that are continuous in the vertical direction are formed on the sheet material 2 of the present embodiment. Thereby, as for the packaging bag 14 of this example, a series of decoration parts 13 which continue to the surface part 6a, the back surface part 6b, and the bottom face part 6c are formed, and it can aim at the improvement of design property.

  FIG. 10 shows a sixth embodiment of the present invention, with the corners 15 and 15 on the folded part 2c side where the front sheet 2a, the back sheet 2b and the side gusset 3 are superposed facing the folded part 2c. Heat sealing is performed at an angle of 45 degrees and cutting is performed so that the width gradually decreases. Thereby, when the packaging bag 16 of this embodiment accommodates the contents, the side gussets 3 and 3 on the corner portions 15 and 15 side are favorably folded into the inside of the bag in a triangular flap shape, and the bottom surface portion 6c is easily formed. And it can be formed with good appearance.

  FIG. 11 shows a seventh embodiment of the present invention. In the boundary position between the front surface portion 6a and the bottom surface portion 6c of the front side sheet 2a and the boundary position between the back surface portion 6b and the bottom surface portion 6c of the back side sheet 2b. , Knobs 17 and 17 are formed. In the packaging bag 18 of the present embodiment, the bottom surface portion 6c can be satisfactorily formed by pulling the knobs 17 and 17 outward when accommodating the contents.

  Next, based on FIG. 12 thru | or FIG. 14, the manufacturing method of the packaging bag 8 of the 2nd form example of this invention which provided the chuck | zipper in the opening part shown in FIG. 6 is demonstrated.

  A bag making machine 30 that manufactures the packaging bag 8 (manufacturing: length 170 mm, width 100 mm, contents storage: height 100 mm, width 100 mm, bottom depth 60 mm) , And a side gusset supply lane 32 for supplying the side gusset 3 arranged in a direction orthogonal to the flow direction of the main body lane 31. First, as shown in FIG. 12 and FIG. In the material feeding step 41, the sheet material 2 wound in a roll shape is fed to the main body lane 31 by a feeding roller (not shown) with the thermal adhesive layer facing the upper surface and the non-adhesive layer facing the lower surface. The sheet material 2 has a pair of chuck portions 7a and 7b that are engaged with each other at the upper part and the lower part in the longitudinal direction, and the upper half part serving as the back sheet 2b is placed on the main body lane 31. The lower half part 2a is arranged on one side surface of the main body lane 31 in the longitudinal direction (the front side in FIGS. 12 and 13A).

  Next, as shown in FIG. 12 and FIG. 13 (B), in the side gusset sheet placement step 42, the band-shaped side gusset sheet 3d folded in a kannon is placed on the upper half portion of the sheet material 2. The pair of folded pieces to be the other half 3c are faced to the front side, and are sequentially placed at a predetermined interval in the vertical direction of the sheet material 2 and temporarily bonded. As shown in FIG. 12 and FIG. 14A, the side gusset sheet 3d is rolled out into a side gusset supply lane 32 by a plurality of feed rollers 32a, and the thermal adhesive layer is placed on the outer surface. Further, it is folded with the non-adhesive layer as the inner surface, and cut by a predetermined length by the cutters 32b and 32b. In this embodiment, like the side gusset sheet 3d shown in FIG. 14 (A), the center of the upper end portion arranged at the upper part of the packaging bag 8 is cut so as to protrude in a mountain shape. Like the side gusset sheet 3d shown in B), the upper end portion disposed at the upper portion of the packaging bag 8 and the lower end portion disposed at the lower portion of the packaging bag 8 are cut linearly, As in the side gusset sheet 3d shown in FIG. 14C, the upper end center may be cut so as to protrude in a mountain shape, and the lower end center may be cut into a mountain shape and cut.

  In the side gusset sheet 3 d, the lower end portion 3 e is disposed beyond the reference line that becomes the folded portion 2 c of the sheet material 2. At this time, as shown in FIG. 15, the protruding length dimension L1 of the side gusset sheet 3d exceeding the reference line is 3 mm or more and the gusset effective depth dimension L2 (the side gusset in the packaging bag 8 in the completed state). 3 halves 3b and 3c, and the length L3 from the mountain fold 3 to the side of the package 8 minus the side seal width L4) is preferably 1 mm or less, and the upper end 3f is The chuck portion 7a may be disposed at a position separated by a predetermined length. The protruding length dimension L1 indicates the case where the right side in FIG. 15 is minimum and the left side is maximum. Further, the side gazette sheet 3d placed on the sheet material 2 is temporarily fixed at the upper and lower two locations by heat sealing or ultrasonic sealing to form temporary fixing portions 3g and 3g.

  Next, as shown in FIG. 12 and FIG. 13 (C), in the sealing tape sticking step 43, the first sealing is performed by a plurality of delivery rollers 43a on the lower end portion of the temporarily attached side gusset sheet 3d. The stop tape 4 is sent out, and the second sealing tape 5 is sent out to the upper end portion of the side gusset sheet 3d by a plurality of feed rollers 43b, and heated by the first sealing device 43c and the second sealing device 43d, respectively. The upper half part of the sheet 3d for side gussets and the lower end part are heat-sealed at the upper half of the sheet material 2.

  The first sealing tape 4 and the second sealing tape 5 are tapes having high strength and high elasticity and having the same adhesiveness as the sheet material 2, and are equivalent to the sheet material 2 on the front and back surfaces. A thermal adhesive layer having thermal adhesiveness is formed. For example, the film used for the first sealing tape 4 and the second sealing tape 5 has a reinforcing material such as polyethylene terephthalate (PET) or nylon (ONY) in an intermediate layer, and low temperatures are provided on both sides of the intermediate layer. It is preferable to use a laminated film formed by appropriately combining an adhesive resin and a high-temperature adhesive resin, and in the case of laminating a low-temperature adhesive resin, the occurrence of pinholes can be reduced and the high-temperature adhesive resin is laminated. Since it has heat resistance, blocking to the seal bar surface can be reduced.

  The 1st sealing tape 4 is stuck so that it may protrude about 3 mm from the lower end part 3e of the sheet | seat 3d for side gussets, and the width dimension L5 is 10 mm or more and gusset effective depth, as FIG. 15 shows. It is preferable that the length L2 or less. Note that the width L5 of the first sealing tape indicates the case where the right side in FIG. 15 is the minimum and the left side is the maximum. Moreover, the 2nd sealing tape 5 is stuck so that it may protrude 1 mm or more from the upper end part 3f of the sheet | seat 3d for side gussets, and it is equivalent to the 1st sealing tape 4, or is formed in width, The width dimension is 10 mm or more is desirable.

  Next, as shown in FIGS. 12, 13 (D), and 13 (F), in the sheet material folding step 44, the lower half of the sheet material 2 is folded back to the upper half side from the reference line, and the chuck portion 7a and 7b are engaged. At this time, the lower half portion of the sheet material 2 is satisfactorily folded back to the upper half portion side while being guided by the folding plate 44a having a right triangle shape provided in the bag making machine 30.

  Furthermore, as shown in FIG. 12 and FIG. 13 (G), in the joining step 45, the center portion of the side gusset sheet 3d, which is folded in a lap-and-mouth direction, and the front side sheet 2a and the back side sheet 2b are one or Heat sealing and joining are performed by a plurality of third sealing devices 45a. The sheet material 2 is provided with a thermal adhesive layer on the inner side folded, the side gusset sheet 3d is provided with a thermal adhesive layer on the outer side, and the non-adhesive layer is provided on the inner side of the side gusset sheet 3d. Since they are arranged, the overlapped inner surfaces of the side gusset sheets 3d are not bonded to each other, and the central portion of the side gusset sheet 3d, the front sheet 2a, and the back sheet 2b are joined. Further, as the third seal device 45a, it is preferable to use a heat seal bar having a distribution width of about 5 mm to 10 mm from the center.

  Finally, as shown in FIG. 12, in the cutting process 46, the width direction center part of the heat seal part formed in the joining process 45 is cut by a cutting machine 46a, and further trimmed and cut, thereby packaging. A bag 8 is manufactured.

  In addition, the manufacturing method of the self-supporting packaging bag with a side gazette of this invention is not restricted to the above-mentioned example of an embodiment, The sheet | seat material does not need to be provided with the chuck | zipper part. Further, instead of the second sealing tape, one of a pair of chuck tapes may be used and the other chuck tape may be heat sealed to the lower half of the sheet material. Further, as the sheet material, a sheet material in which a series of decorative portions are formed in the width direction or a material in which decorative portions are appropriately formed can be used. Furthermore, after the cutting step, two corners on the folded portion side where the front sheet, the back sheet, and the side gusset overlap are heat-sealed at an angle of 45 degrees so that the width gradually decreases toward the folded portion side. You may provide the corner | angular part process process cut | disconnected with.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag, 2 ... Sheet material, 2a ... Front side sheet, 2b ... Back side sheet, 2c ... Folding part, 3 ... Side gusset, 3a ... Mountain fold part, 3b ... One half, 3c ... Other half, 3d ... sheet for side gusset, 3e ... lower end part, 3f ... upper end part, 3g ... temporary fixing part, 4 ... first sealing tape, 5 ... second sealing tape, 6a ... front surface part, 6b ... back surface part, 6c ... bottom surface part, 6d ... opening seal part, 7a, 7b ... chuck part, 8 ... packaging bag, 9 ... rib, 10 ... packaging bag, 11a ... first chuck tape, 11b ... second chuck tape, 11c ... male side occlusion Part 11d ... female side occlusion part, 12 ... packaging bag, 13 ... decoration part, 14 ... packaging bag, 15 ... corner part, 16 ... packaging bag, 17 ... picking part, 18 ... packaging bag, 30 ... bag making machine, 31 ... Main body lane, 32 ... Side gusset supply lane, 32a ... Feeding roller, 2b ... Cutting machine, 41 ... Sheet material feeding step, 42 ... Side gadget sheet placing step, 43 ... Seal tape sticking step, 43a, 43b ... Feeding roller, 43c ... First seal device, 43d ... Second seal 44, sealing material folding step, 44a ... folding plate, 45 ... joining step, 45a ... third sealing device, 46 ... cutting machine

Claims (13)

A front side sheet, a back side sheet, and a pair of side gussets respectively joined to both sides of the front side sheet and the back side sheet, and when the contents are stored, the side gusset, the front side sheet, and the back side sheet develop. Then, in the self-supporting packaging bag with side gusset, in which the front surface portion, the back surface portion, and the bottom surface portion are formed, the front side sheet and the back side sheet are made of a single sheet material, and the side gusset is The sealing tape is formed in a double fold from the folded portion of the sheet material to the bag opening side, with the mountain fold side facing the bag inside, and joins the back sheet and the upper and lower ends of the side gusset the provided, upon receiving the contents, the side gusset and with the front sheet and the back sheet to expand, the side gusset of the folded portion side bag inside shape triangular flap In addition to being folded, the folded portion side of the front sheet and the folded portion side of the back sheet are folded so as to be in the same plane, and the front surface portion, the back surface portion, and the bottom surface portion are formed. A self-supporting packaging bag with side gusset.   The self-supporting packaging bag with side gussets according to claim 1, wherein the opening is provided with a chuck.   Ribs serving as creases when the bottom surface portion is formed at the boundary position between the front surface portion and the bottom surface portion of the front sheet and the boundary position between the back surface portion and the bottom surface portion of the back sheet. The self-supporting packaging bag with a side gusset according to claim 1 or 2, wherein each is provided.   When the bottom surface portion is formed at the boundary position between the top surface portion and the bottom surface portion of the front side sheet and the boundary position between the back surface portion and the bottom surface portion of the back side sheet, they are pulled to the outside. The self-supporting packaging bag with a side gusset according to claim 1 or 2, wherein a knob part is provided. Claims and said front sheet and said back sheet and the side gusset two corners of the folded portion side to polymerization, characterized by the gradual width is narrower Turkey at an angle of 45 degrees toward the folded portion The self-supporting packaging bag with a side gusset according to any one of 1 to 4.   The self-supporting packaging bag with side gussets according to any one of claims 1 to 5, wherein a series of decorative portions are provided on the front surface portion, the back surface portion, and the bottom surface portion. A front side sheet, a back side sheet, and a pair of side gussets respectively joined to both sides of the front side sheet and the back side sheet, and when the contents are stored, the side gusset, the front side sheet, and the back side sheet develop. Then, in the method for producing a self-supporting packaging bag with side gussets, in which a front surface portion, a back surface portion, and a bottom surface portion are formed and can be self-supporting,
A sheet material sending step of sending out one sheet material, and placing the upper half of the back material of the sheet material on the lane of the bag making machine;
In the upper half of the sheet material sent to the bag making machine, a band-shaped side gusset sheet folded in a folding manner, with a pair of folded pieces facing the front side and a predetermined interval in the vertical direction of the sheet material A side gusset sheet placing step for placing and temporarily adhering in sequence,
A sealing tape adhering step in which a sealing tape having thermal adhesiveness is disposed on an upper end portion and a lower end portion of the temporarily bonded side gusset sheet, and the sealing tape and the sheet material are heat-sealed; ,
A sheet material folding step of folding and overlapping the lower half of the sheet material, which is the front side sheet, to the upper half side, the center part of the side gusset sheet that has been folded, and the front side sheet and the back side sheet. Manufacturing a self-supporting packaging bag with a side gusset, comprising: a joining step for heat-sealing and joining; and a cutting step for cutting a central portion in the width direction of the heat-sealed portion formed in the joining step Method.   8. The sheet material is formed by extruding a pair of chuck portions that mesh with each other in a longitudinal direction on the upper side of the upper half and a longitudinal direction on the lower side of the lower half. Method of self-supporting packaging bag with side gusset.   The sealing tape sealed to the upper end portion of the side gusset sheet is formed of one chuck tape of a pair of chuck tapes having male and female occlusion portions on the surface, and the lower half portion of the sheet material. 8. The method for producing a self-supporting packaging bag with side gussets according to claim 7, wherein the other chuck tape is sealed on the lower side.   The sheet material is formed with ribs that serve as creases when the bottom surface portion is folded and formed in the longitudinal direction on the lower side of the upper half and the longitudinal direction on the lower side of the lower half. The method for producing a self-supporting packaging bag with side gussets according to any one of claims 7 to 9.   The sheet material is formed by folding the bottom surface portion in the longitudinal direction on the lower side of the upper half portion and the longitudinal direction on the lower side of the lower half portion, thereby pulling the bottom surface portion toward each other. The manufacturing method of the self-supporting packaging bag with a side gusset according to any one of claims 7 to 9, wherein a knob portion to be formed is formed.   After the cutting step, the two corners on the folded part side where the front sheet, the back sheet, and the side gusset overlap are joined at an angle of 45 degrees so that the width gradually decreases toward the folded part side. The manufacturing method of the self-supporting packaging bag with a side gazette of any one of Claims 7 thru | or 11 provided with the corner | angular part process process cut | disconnected while cut | disconnecting.   The method for manufacturing a self-supporting packaging bag with side gussets according to any one of claims 7 to 12, wherein the sheet material is formed with a series of decorative portions that are continuous in the vertical direction.

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