JPH08282689A - Gussetted packing bag equipped with freely openable and closable hermetic seal chuck - Google Patents

Abstract

PURPOSE: To provide a novel gussetted packing bag capable of being easily equipped with a hermetic seal chuck without increasing the number of parts or processes to be achieved in cost reduction. CONSTITUTION: Two fold gussets 3, 4 made of a thermoplastic resin sheet are respectively arranged between both side parts of front and back members 1, 2 made of a thermoplastic resin sheet and a pair of hermetic seal chucks made of a thermoplastic resin sheet and freely engageable with each other are arranged between the front member 1 and the gussets 3, 4 and the whole of the base 7 of one hermetic seal chuck is welded to the inner surface of the front member 1 while both end parts of the base 8 of the other hermetic seal chuck are welded to the single side half surfaces 28, 29 of the gussets 3, 4 opposed to the front member 1 and the intermediate part other than them thereof is welded to the inner surface of the back member 2 and, further, both end places of the outside of the intermediate part welded to the base 8 of the hermetic seal chuck on the inner surface side of the back member 2 are welded to the single side half surfaces 30, 31 opposed to the back member 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusseted packaging bag having an opening / closing seal chuck at its opening.

[0002]

2. Description of the Related Art When the contents (for example, powdered beverages such as cocoa) are taken out little by little and used, the opening of the packaging bag needs to be repeatedly opened and closed. Is desirable. 2. Description of the Related Art Conventionally, there is known a flat plastic bag without a gusset, in which sealing chucks that can be inserted into and removed from each other are provided on the inner surfaces of the front surface and the back surface, and the opening thereof can be opened and closed. On the other hand, in the case of a packaging bag provided with a gusset to increase the contents, it is troublesome to provide a sealing chuck because the gusset is an obstacle. For example, conventionally, as shown in FIG. 7 (a), a bag body 25 with gussets 26 and 27 is formed, and in a separate step from that, a pair of hermetically sealed chucks 20 and 21 that can be fitted into and removed from each other are formed on the inner surfaces. 7 is attached by means of welding or the like to form a seal body 24 consisting only of the front face portion 22 and the back face portion 23, and the seal body 24 is opened as a post-process as shown in FIG. 7B. A complicated method of joining the ends by means such as welding is adopted. 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, the present invention provides a novel packaging bag with a gusset which can easily be provided with a sealing chuck without increasing the number of parts and the number of steps and can reduce the cost. For the purpose of provision.

[0004]

In order to achieve the above object, a packaging bag with a gusset provided with an openable and closable sealing chuck according to the present invention is a thermoplastic resin sheet on both sides of a front body 1 and a back body 2. The gussets 3 and 4, which are also made of a thermoplastic resin sheet and are folded in half, are arranged between the sides, respectively, and the front body 1 and the gussets 3 and 4 are also made of a thermoplastic resin sheet and can be fitted into and removed from each other. A pair of sealing chucks 5 and 6 are arranged, and the base 7 of the one sealing chuck 5 is arranged.
Is welded to the inner surface of the front body 1, and the base 8 of the other sealing chuck 6 is welded at its both ends to the one half surfaces 28 and 29 of the gussets 3 and 4 facing the front body 1 and the other end. The intermediate portion is welded to the inner surface of the rear body 2, and further, both ends of the outer side of the intermediate portion welded to the base 8 of the sealing chuck 6 on the inner surface of the rear body 2 of the gussets 3 and 4 facing the rear body 2 are joined. It adopts a structure characterized by being welded to one half surfaces 30, 31.

[0005]

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. 1 to 5, reference numeral 1 is a rectangular front body, reference numeral 2 is a rear body having the same shape as the front body, and reference numerals 3 and 4 are front body 1 and rear body 2.
Gussets, reference numerals 5 and 6, respectively interposed between both side portions of the
Is a sealing chuck composed of grooves and ridges that can be fitted into and removed from each other, reference numerals 7 and 8 are the bases of the sealing chucks 5 and 6, and these members are all made of thermoplastic resin. The front body 1, the back body 2, and the gussets 3 and 4 are each formed by laminating a resin film having a slightly lower melting temperature than that on one surface of a flexible base material sheet.

The gussets 3 and 4 are folded in two in the width direction, and the folds are arranged inside between the both side portions of the front body 1 and the back body 2, and the both side portions are arranged on the front body 1 and the back surface. They are welded to the sides of the body 2. In the figure, reference numeral 9 is the welded portion.

The front body 1 and the back body 2 are welded to the gussets 3 and 4 at both side portions as described above, but the bottom portions thereof are welded to each other at their intermediate portions as shown in FIG. At the same time, both ends are welded to the half surfaces of each of the gussets 3 and 4 that are folded in half.

A pair of hermetically sealed chucks 5, which can be inserted into and removed from each other.
As shown in FIG. 3, 6 is attached to the inner surface of the bag body 10 at a position close to the open end. That is, as shown in FIG. 4, the entire base 7 of the one sealing chuck 5 is welded to the inner surface thereof so as to traverse the front body 1, and the base 8 of the other sealing chuck 6 is also shown in FIG. As described above, the both end portions are welded to the one-side half surfaces 28 and 29 of the gussets 3 and 4 facing the front body 1, and the other intermediate portions are welded to the inner surface of the back body 2. It should be noted that both ends of the inner surface of the back body 2 on the outside of the intermediate portion welded to the base 8 of the sealing chuck 6 are welded to the one-side half surfaces 30 and 31 of the gussets 3 and 4 facing the back body 2.

Next, a method of manufacturing the packaging bag 19 will be described with reference to FIG.
It will be explained based on. First, a series of long sheets 11 for the back body made of thermoplastic resin are fed in the direction of the arrow in the figure. The sheet 11 for a back body is obtained by laminating a resin film having a slightly lower melting temperature than that on one surface of the base material sheet as described above. There is. 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 central portion on the upper surface side, is fed so as to be orthogonal to the back body sheet 11, and the back body sheet 11 Place on top. The gusseted sheet 12 in the folded state is also formed by laminating a resin film having a slightly lower melting temperature than that on one surface of the base material sheet as described above. On the side. Next, one of the pair of thermoplastic chuck tapes 13 and 14 made of thermoplastic resin, in which the seal chucks 5 and 6 are integrally formed on the bases 7 and 8, respectively, is attached to the back body sheet 11 and the gusset sheet. Place it further above 12. At this time, the sealing chuck tape 13 is made to be orthogonal to the gusset sheet 12 and close to one end of the back body sheet 11 in the width direction. Then, the sealing chuck tape 13 is heat-welded to the back body sheet 11 and the gusset sheet 12 at the melting temperature of the resin film laminated on the base material sheet and having a slightly lower melting temperature. In the figure, reference numeral 15 is the welded portion. At this time, only the outer surface side of the gusset sheet 12 in the folded state is welded, and the upper portion 3
2 is welded to the sealing chuck tape 13, and the lower part 33
Is welded to the back body sheet 11, but the gusset sheet 12
Since the inner surface side of is not welded, the separated state is maintained. Next, after the welded gusset sheet 12 is cut into a length substantially the same as the width of the back body sheet 11, the back body sheet 11 is moved at a constant interval, and again in the same manner as above. The process of welding the tape 13 for hermetically-sealed chucks on 12 and cutting the sheet 12 for gussets is repeated. Next, on the back sheet 11, the gusset sheet 12, and the sealing chuck tape 13, a series of long thermoplastic resin front sheet 16 having the same width as the back sheet 11 is formed. Place on top of each other. The front body sheet 16 is also formed by laminating a resin film having a slightly lower melting temperature than that on one surface of the base material sheet as described above, but with the resin film having a slightly lower melting temperature as the lower surface side. There is. In addition, in the vicinity of one end in the width direction on the lower surface of the front body sheet 16,
The other sealing chuck tape 14 is welded so as to face the above sealing chuck tape 13. In the figure, reference numeral 17 is the welded portion. In this way, after the back body sheet 11, the gusset sheet 12, the pair of sealing chuck tapes 13 and 14 and the front body sheet 16 are superposed and the sealing chucks 5 and 6 are fitted to each other, , Heat welding them together. Also in this case, heat welding is performed at the melting temperature of the resin film having a slightly lower melting temperature laminated on each of the base material sheets 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, each gusset sheet 12 in parallel is positioned at regular intervals in parallel.
Is welded in the longitudinal direction, and the edge portion on the opposite side of the one end where the sealing chuck tapes 13 and 14 are adjacent to each other is welded at one end of the front body sheet 16 in the width direction. Also at this time, each gusset sheet 12 folded in two
Is welded only on the outer surface side and is not welded on the inner surface side, and the separated state is maintained. And finally, the central portion of the welded portion 18 at the position of the gusset sheet 12 is cut in the longitudinal direction.
As a result, the packaging bag 19 shown in FIGS.
Is completed.

[0010]

The packaging bag of the present invention is as described above, and in particular, the entire base 7 of one sealing chuck 5 is welded to the inner surface of the front body 1, and the base of the other sealing chuck 6 is also welded. 8 is a gusset 3 or 4 whose both ends face the front body 1.
Since it is configured to be welded to one half surface of the back body 2 and the other intermediate portion to the inner surface of the back body 2, the sealing chucks 5 and 6 can be provided at the same time in the process of manufacturing the bag body 10. As described above, there is no complexity of attaching a sealed chuck in the post-processing, and the process is simplified and reduced, and the productivity is improved. In addition, the seal body 24 in the above-mentioned conventional example
No such member is required, and the number of parts can be minimized. Therefore, there is an advantage that the packaging bag of the present invention can be manufactured at low cost and can be provided at low cost.

[Brief description of drawings]

FIG. 1 is an overall perspective view.

FIG. 2 is a partial perspective view of a bottom portion.

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

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

5 is a cross-sectional view taken along the line CC of FIG.

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

FIG. 7 is a perspective view showing a step of providing a sealing chuck on a conventional packaging bag.

[Explanation of symbols]

 1 Front body 2 Back body 3,4 gusset 5,6 Sealing chuck 7,8 Sealing chuck base 9,15,17,18 Welding part 10 Bag body 11 Back body sheet 12 Gusset sheet 13,14 Sealing chuck tape 16 Front body sheet 19 Packaging bag 20,21 Sealing chuck 22 Front part 23 Back part 24 Seal body 25 Bag body 26,27 Machi 28,29,30,31 One side of gusset 32 Upper part of gusset sheet 33 For gusset Lower part of the seat

Claims (1)

[Claims] 1. A front body 1 both made of a thermoplastic resin sheet.
Similarly, two gussets 3 and 4 made of a thermoplastic resin sheet are arranged between both side portions of the back body 2 and the back body 2, and the same thermoplastic resin sheet is provided between the front body 1 and the gussets 3 and 4. Made of a pair of sealed chucks 5, which can be inserted and removed from each other.
6, the whole base 7 of one of the sealing chucks 5 is welded to the inner surface of the front body 1, and the base 8 of the other sealing chuck 6 has its both ends facing the front body 1. , 4 on one side half surfaces 28, 29 and the other intermediate portion is welded to the inner surface of the rear body 2 and further the outer side of the intermediate portion welded to the base 8 of the sealing chuck 6 on the inner surface of the rear body 2. A packaging bag with a gusset having openable and closable sealing chucks, wherein both ends of the gusset are welded to one side half surfaces 30, 31 of the gussets 3, 4 facing the back body 2.