JPH10245046A - Packaging bag with gusset, having opening/closing zipper, and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attach an opening/closing zipper and gussets, and facilitate the unsealing by a method wherein for the opening/closing zipper, both ends of a base sheet part are welded to the half surface of one side of a gusset which is confronted with a front surface body, and the vicinity of ear parts of the front surface body and a back surface body is welded and sealed, and the ear part is cut to open the bag. SOLUTION: The whole body of the base sheet part 7 of an opening/closing zipper 5 is welded to the internal surface of a front surface body 1, and for an opening/closing zipper 6, both ends of the base sheet 8 are welded to the half surfaces of one side of gussets 3, 4 which are confronted with the front surface body 1, and at the same time, an intermediate part other than the both ends is welded to the internal surface of a back surface body 2. Also, both ends on the external side of the intermediate part which is welded to the base sheet 8 of the opening/closing zipper 6 on the internal surface of the back surface body 2, are welded to the half surfaces of the side of the gussets 3, 4 being confronted with a back surface body 2. The housing of a content in the bag main body is performed by opening either one of the leading ends of ear parts 34, 35, and then, the leading end is welded. The unsealing is performed by cutting off the ear part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag having a gusset and an opening which can be opened and closed by a chuck, and a method of manufacturing the packaging bag.

[0002]

2. Description of the Related Art When contents (for example, powdered drinks such as cocoa) are taken out little by little and used, it is necessary to repeatedly open and close the opening of the packaging bag. It is desirable to provide. 2. Description of the Related Art Conventionally, a gusset-free flat vinyl packaging bag or the like in which chucks which can be fitted to and detached from each other are provided on the inner surfaces of a front portion and a back portion and the opening thereof is freely openable and closable is known. On the other hand, in the case of a packaging bag provided with a gusset to increase the contents, it is troublesome to provide an opening / closing chuck because the gusset becomes an obstacle. For example, conventionally, as shown in FIG. 7A, a bag main body 25 with gussets 26 and 27 is formed, and a pair of opening / closing chucks 20 and 21 that can be detachably fitted to each other on the inner surface in a separate process. Is formed only by the front part 22 and the back part 23 by welding or the like, and the seal body 24 is opened as a post-process in the opening of the bag body 25 as shown in FIG. A complicated method of joining the ends by means such as welding is employed. Therefore, there has been a problem that the number of parts and the number of steps are increased and the cost is increased.

[0003]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the opening / closing chuck and the gusset can be easily attached without increasing the number of parts and the number of steps, so that the cost can be reduced. It is an object to provide a packaging bag which can be easily opened and to provide a method for efficiently manufacturing the packaging bag.

[0004]

SUMMARY OF THE INVENTION A gusseted wrapping bag provided with an opening / closing chuck according to the present invention has been devised to solve the above-mentioned problems, and is made of a thermoplastic resin sheet and has the same front body. 1 and the front body 1
And gussets 3 and 4 made of the same thermoplastic resin sheet, which are shorter and smaller than the back body 2 and which are folded in half, respectively, and are protruded outward from the ends of the gussets 3 and 4 at the ends of the front body 1 and the back body 2. And a pair of opening / closing chucks 5 and 6 which are also made of a thermoplastic resin sheet and are detachable from each other are attached to the gussets 3 and 4 at the ends of the gussets 3 and 4. At right angles, the two end portions are sandwiched between the gussets 3 and 4 and the front body 1, and the middle portion is arranged so as to be sandwiched between the front body 1 and the back body 2. The entirety of the base sheet portion 7 of the opening / closing chuck 5 is welded to the inner surface of the front body 1, and the other opening / closing chuck 6 has both ends of the base sheet portion 8 on one side of the gussets 3 and 4 facing the front body 1. While being welded to the half surfaces 28 and 29, the other intermediate portion is welded to the inner surface of the back body 2. In addition, on the inner surface of the back body 2, both ends outside the intermediate portion welded to the base sheet portion 8 of the opening / closing chuck 6 are welded to the half-faces 30 and 31 of the gussets 3 and 4 facing the back body 2. , And the above-mentioned front body 1
The periphery of the ears 34 and 35 of the back body 2 is sealed by welding, and the ears 34 and 35 are cut off and can be opened.

A method of manufacturing a gusseted wrapping bag provided with an opening / closing chuck according to the present invention is also intended to solve the above-mentioned problem, and comprises a front body 1 and a back body 2 which are both made of a thermoplastic resin sheet and have the same shape. The gussets 3 and 4 made of the same thermoplastic resin sheet, which are shorter and smaller than the front body 1 and the back body 2, are sandwiched between the both sides, and the gussets 3 are provided at the ends of the front body 1 and the back body 2. , 4 are provided outwardly and projecting outwardly from the ends, and are provided in a directly superimposed state. Also, a pair of opening and closing chucks 5, which are also made of a thermoplastic resin sheet and are detachable from each other, are provided.
6 is perpendicular to the gussets 3 and 4 at the end positions of the gussets 3 and 4, both ends thereof are sandwiched between the gussets 3 and 4 and the front body 1, and the intermediate portion thereof is the front body 1 and the back face The base sheet portion 7 of one of the opening / closing chucks 5 is welded to the inner surface of the front body 1, and
The other opening / closing chuck 6 has one side half surfaces 28 and 29 of gussets 3 and 4 which face both ends of the base sheet portion 8 with the front body 1.
And the other intermediate portion is welded to the inner surface of the back body 2, and both ends outside the intermediate portion welded to the base sheet portion 8 of the opening / closing chuck 6 on the inner surface of the back body 2 One side half 3 of gussets 3 and 4 facing body 2
0, 31 and the front body 1 and the back body 2
And the periphery of the ear portions 34 and 35 is sealed by welding.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a packaging bag 19 of the present invention,
FIG. 6 shows the manufacturing process. First, in FIGS. 1 to 5, reference numeral 1 denotes a rectangular front body, reference numeral 2 denotes a rear body having the same shape as the front body, and reference numerals 3 and 4 denote front bodies 1 and rear bodies 2.
Gussets, reference numerals 5 and 6 respectively interposed between both side portions of
Are open / close chucks having grooves and protrusions which can be fitted to and removed from each other, and reference numerals 7 and 8 denote base sheet portions of the open / close chucks 5, 6, and these members are all made of thermoplastic resin. In addition, the front body 1, the back body 2, and the gussets 3 and 4 are obtained by laminating a resin film having a slightly lower melting temperature than one side of a flexible base sheet.

The gussets 3 and 4 are slightly shorter than the front body 1 and the back body 2 and are folded in the width direction so that the folds are formed between both sides of the front body 1 and the back body 2 with the folds inside. It is attached by welding both sides to the sides of the front body 1 and the back body 2 respectively. In the figure, reference numeral 9 denotes the welded portion. The ends of the front body 1 and the back body 2 project outward from the ends of the gussets 3 and 4 to form ears 34 and 35 which overlap directly. These ears 34, 35
Has a peripheral portion sealed by welding, and cutouts 36 and 37 are provided on its side.

The inside positions of the ears 34 and 35 on the front body 1 and the back body 2 of the bag body 10,
A pair of openable and closable chucks 5, 6 which are detachable from each other are attached to positions overlapping with the longitudinal ends of the gussets 4 so as to be orthogonal to the gussets 3, 4. As shown in FIG. 3, the opening and closing chucks 5 and 6 are disposed at both ends thereof between the front body 1 and the gussets 3 and 4, and the intermediate portion thereof is disposed between the front body 1 and the back body 2, The entire base sheet portion 7 of one opening / closing chuck 5 is welded to the inner surface of the front body 1 so as to cross the front body 1, and the other opening / closing chuck 6 faces both ends of the base sheet portion 8 with the front body 1. One side half 28,2 of gusset 3,4
9, and the other intermediate portions are welded to the inner surface of the back body 2. Further, both ends on the inner surface of the back body 2 outside the intermediate portion welded to the base sheet portion 8 of the opening / closing chuck 6 are welded to the half-faces 30 and 31 of the gussets 3 and 4 facing the back body 2. Have been.

On the other hand, as shown in FIG. 5, an intermediate portion between the front body 1 and the back body 2 is welded to the bottom of the bag body 10, and both ends of each of the gussets 3 and 4 are folded in two. Welded to one half surface.

The contents are stored in the bag body 10 at the bottom of the bag body 10 or at the top of the bag body 10, ie, at the top of the bag body 10.
The operation is performed in a state where one of the end portions of the ear portions 34 and 35 is open, and then the opening is sealed by welding as described above.

Next, a method of manufacturing the packaging bag 19 will be described with reference to FIG.
It will be described based on. First, a series of long back body sheets 11 made of a thermoplastic resin is fed in the direction of the arrow in the figure. The back body sheet 11 is obtained by laminating a resin film having a slightly lower melting temperature on one side of the base sheet as described above, and setting the resin film having a slightly lower melting temperature on the upper surface side. I have. Next, the gusset sheet 12 made of a thermoplastic resin, which is folded in two so that both ends in the width direction are aligned at the center portion on the upper surface side, is sent orthogonal to the back body sheet 11 so that the back body sheet 11 Place on top. The gusset sheet 12 in the two-fold state is also formed by laminating a resin film having a slightly lower melting temperature on one side of the base sheet as described above. On the side. In this case, the leading end of the gusset sheet 12 does not reach one end in the width direction of the back body sheet 11.

Next, one of the continuous tapes 14, 13 of the pair of opening / closing chucks 5, 6 in which a groove and a ridge which can be detachably fitted to each other are integrally formed in the base sheet portions 7, 8 respectively, for example, a ridge is provided. The continuous tape 13 of the opening / closing chuck 6 having
It is placed on the back body sheet 11 and the gusset sheet 12 described above. At this time, the continuous tape 13 of the opening / closing chuck 6 is orthogonal to the gusset sheet 12 and
It is superimposed on the end of the gusset sheet 12. The continuous tapes 14, 13 of the opening / closing chucks 5, 6 are also made of thermoplastic resin. Then, the continuous tape 13 of the opening / closing chuck 6 is used.
To the back body sheet 11 and the gusset sheet 12 at a melting temperature of a slightly lower melting temperature of the resin film laminated on the base sheet. In the drawing, reference numeral 15 denotes the welded portion. At this time, only the outer surface side of the gusset sheet 12 in the folded state is welded, the upper portion 32 is welded to the continuous tape 13 of the opening / closing chuck 6, and the lower portion 33 is welded to the back body sheet 11.
Since the inner surface side of the gusset sheet 12 is not welded, the separated state is maintained.

Next, after cutting the welded gusset sheet 12 at the other end in the width direction of the back body sheet 11, the back body sheet 11 is moved at a fixed interval, and again in the same manner as described above. , Gusset sheet 1 on back body sheet 11
2 on top of the gusset sheet 12 and the opening / closing chuck 6
The process of mounting the continuous tape 13 and integrally welding and then cutting the gusset sheet 12 is repeated.

Next, a series of long front faces made of a thermoplastic resin having the same width as the back body sheet 11 are placed on the back body sheet 11, the gusset sheet 12, and the continuous tape 13 of the opening / closing chuck 6. The body sheets 16 are placed on top of each other. This front body sheet 16 is also a sheet obtained by laminating a resin film having a slightly lower melting temperature on one side of the base sheet as described above, but with the resin film having a slightly lower melting temperature on the lower side. I have. Also,
In the vicinity of one end in the width direction on the lower surface of the front body sheet 16, a continuous tape 14 of the other opening / closing chuck 5 is welded and placed so as to face the continuous tape 13 of the opening / closing chuck 6 described above. In the drawing, reference numeral 17 denotes the welded portion.

As described above, the back body sheet 11, the gusset sheet 12, and the continuous tapes 13, 1 of the pair of opening / closing chucks are provided.
4 and the front body sheet 16 are overlapped and the opening and closing chucks 5 and 6 are closed to each other, and then they are integrally welded. In this case as well, heat welding is performed at a melting temperature of a slightly lower melting temperature of the resin film laminated on each base sheet of the back body sheet 11, the gusset sheet 12, and the front body sheet 16. In the figure, reference numeral 18
Indicates the welded portion. That is, the central position of each gusset sheet 12 in a folded state, which is positioned in parallel at a constant interval, is welded in the longitudinal direction, and the front body sheet 16 is welded.
Also, one end of the back body sheet 11 in the width direction, that is, a portion corresponding to the bottom side of the bag body 10 is welded. Note that, instead of the bottom side of the bag body 10, the front end portions of the ear portions 34 and 35, which are the upper side portions of the bag body 10, may be welded. That is,
One of the bottom side or the top side of the bag body 10 is opened to accommodate the contents. Also at the time of this welding, only the outer surface side of each folded gusset sheet 12 is welded, and the separated state is maintained without welding the inner surface side. Thereafter, the central position of the welding portion 18 of the gusset sheet 12 is cut in the longitudinal direction. At this time, notches 36 and 37 are simultaneously formed on both side portions of the ear portions 34 and 35. Thereby, the packaging bag 19 is completed. After the contents of the packaging bag 19 are accommodated through the opening, the opening is welded and sealed.

[0016]

The gusseted packaging bag provided with the opening / closing chuck of the present invention is as described above. In particular, the entire base sheet portion 7 of one opening / closing chuck 5 is welded to the inner surface of the front body 1. The base sheet portion 8 of the other opening / closing chuck 6 has both ends welded to the half-surfaces 28 and 29 of the gussets 3 and 4 facing the front body 1 and the other intermediate portions welded to the inner surface of the back body 2. The bag body 10
Opening and closing chucks 5 and 6 can be attached at the same time in the manufacturing process, and there is no need to mount the opening and closing chucks by post-processing as in the above-described conventional example, and the process is simplified and reduced, thereby improving productivity. . Further, a member such as the seal body 24 in the above-described conventional example is not required, and the number of parts can be suppressed to a necessary minimum. Therefore, the gusseted packaging bag provided with the opening / closing chuck of the present invention has an advantage that it can be manufactured at low cost and can be provided at low cost. The gusseted packaging bag provided with the opening / closing chuck of the present invention comprises a front body 1 and a back body 2.
Ears 34, 35 projecting to the outside of the opening / closing chucks 5, 6 and the gussets 3, 4 to weld and seal the periphery thereof.
The ears 34 and 35 are cut off and opened, so that when the ears 34 and 35 are cut off, the gussets 3 and 4 do not become an obstacle, and there is an advantage that opening is easy. Further, the method for manufacturing a gusseted packaging bag provided with the opening / closing chuck according to the present invention has an advantage that the packaging bag can be efficiently manufactured as described above and the productivity is good. Further, as in the above embodiment, the back body sheet 11, the gusset sheet 1
2, and a sheet 16 for the front body, which is obtained by laminating a resin film having a slightly lower melting temperature on one side of a base sheet, and melting the resin film having a slightly lower melting temperature when welding. By welding at a temperature, there is an advantage that unnecessary portions are not welded and the welding operation is facilitated.

[Brief description of the drawings]

FIG. 1 is an overall perspective view.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a partial perspective view of a bottom.

FIG. 6 is a perspective view showing a manufacturing process.

FIG. 7 is a perspective view showing a step of providing an open / close chuck on a conventional packaging bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front body 2 Back body 3,4 gusset 5,6 Opening / closing chuck 7,8 Base sheet part of opening / closing chuck 9,15,17,18 Welding part 10 Bag body 11 Back body sheet 12 Gusset sheet 13,14 Opening / closing chuck Continuous tape 16 Front body sheet 19 Packaging bag 20,21 Opening / closing chuck 22 Front part 23 Back part 24 Seal body 25 Bag body 26,27 Depth 28,29,30,31 One side half side of gusset 32 Upper part of gusset sheet 33 Lower part of gusset sheet 34,35 Ear 36,37 Notch

Claims (2)

[Claims] 1. A sheet made of the same thermoplastic resin sheet, which is made of a thermoplastic resin sheet and is folded in two between both sides of the front body 1 and the back body 2 having the same shape and shorter than the front body 1 and the back body 2. Front body 1 and back body 2 sandwiching gussets 3 and 4 respectively
Are provided at the ends of the gussets 3 and 4 so as to project outward from the ends of the gussets 3 and 4 so as to be directly superimposed on each other. 6 is perpendicular to the gussets 3 and 4 at the end positions of the gussets 3 and 4, both ends thereof are sandwiched between the gussets 3 and 4 and the front body 1, and the intermediate portion thereof is the front body 1 and the back face The base sheet portion 7 of one of the opening and closing chucks 5 is welded to the inner surface of the front body 1,
The other opening / closing chuck 6 has one side half surfaces 28 of the gussets 3 and 4 with both ends of the base sheet portion 8 facing the front body 1.
29, and the other intermediate part is
One end half 30 of the gussets 3, 4 facing the back body 2 at both ends outside the intermediate portion welded to the base sheet portion 8 of the opening / closing chuck 6 on the inner surface of the back body 2 31 wherein the periphery of the ears 34, 35 of the front body 1 and the back body 2 is sealed by welding, and the ears 34, 35 can be cut out and opened. A gusseted packaging bag with a chuck. 2. The same thermoplastic resin sheet, which is made of a thermoplastic resin sheet and is folded between the both sides of a front body 1 and a rear body 2 having the same shape, which is shorter and smaller than the front body 1 and the rear body 2. Front body 1 and back body 2 sandwiching gussets 3 and 4 respectively
Are provided at the ends of the gussets 3 and 4 so as to project outward from the ends of the gussets 3 and 4 so as to be directly superimposed on each other. 6 is perpendicular to the gussets 3 and 4 at the end positions of the gussets 3 and 4, both ends thereof are sandwiched between the gussets 3 and 4 and the front body 1, and the intermediate portion thereof is the front body 1 and the back face The base sheet portion 7 of one of the opening and closing chucks 5 is welded to the inner surface of the front body 1,
The other opening / closing chuck 6 has one side half surfaces 28 of the gussets 3 and 4 with both ends of the base sheet portion 8 facing the front body 1.
29, and the other intermediate part is
One end half 30 of the gussets 3, 4 facing the back body 2 at both ends outside the intermediate portion welded to the base sheet portion 8 of the opening / closing chuck 6 on the inner surface of the back body 2 31. A method for manufacturing a gusseted packaging bag provided with an open / close chuck, wherein the periphery of the ears 34, 35 of the front body 1 and the back body 2 is sealed by welding.