JPS5933791Y2 - Bag with gusset - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a bag with a gusset.

It has been known to form a bag body by fusing and welding polymerized front and back film parts.

Also, a bag provided with a gusset portion to increase the capacity of the bag is known.

However, while the type of bag formed by fusing and welding the film described above is suitable for mass production, it has the disadvantage that there are restrictions in providing the gusset portion, or that the gusset function cannot be fully performed.

That is, the gusset part can be easily formed by bending the film into a corrugated cross-sectional shape, but if the fusing and welding line of the bag passes over the gusset part, the gusset part that has been bent and polymerized at the fusion part can be easily formed. There is a problem in that all of the films that affect the process are welded together like a sandwich.

This has the disadvantage that the gazette part cannot be expanded to a predetermined and expected state.

Further, while the gusset portion is expanded in the portions not located at the weld line, the gusset portion is not expanded in the welded and integrated portions, resulting in distortion of the entire bag.

Furthermore, in conventional bags, in order to provide a gusset part, the only thing that is done is to bend the film inward into the bag into a roughly V-shaped cross section, which corresponds to the unfolded shape of the gusset part provided at the bottom of the bag. Expansion of the bag was possible only by

Since it is necessary to melt and cut the film at both edges of the lid and the bag during the bag making process, it is not possible to provide a gusset section on both edges. This is because there is a preconceived notion that it cannot be formed.

In view of the above, in a mass-produced bag made by fusing and welding a film, the present invention is designed to include a bag expansion means different from the gusset part on both sides of the bag in order to enable fusing and welding in the bag making process. In addition, a gusset part extending in the width direction of the bag is provided in order to enable uniform expansion of the bag together with the expansion means. It is an object of the present invention to provide a bag with a gusset that can be expanded into a desired state.

Embodiments of the present invention will be described below in detail based on the drawings. In the first embodiment shown in FIGS. death,
It is formed from polymerized front and back film parts la and lb.

A header 2 is interposed between the front and back film parts 1a and lb at the upper bent part, and a bag suspension hole 3 is opened therethrough.

This header 2 is made of a thick synthetic resin sheet, synthetic paper, or synthetic paper laminated with a resin film, and in short, it is relatively strong, can be thermally cut, and can be welded to the above film. Good.

In the illustrated example, the film portions constituting the bag body 1 have a front film portion 1a that hangs straight downward from a new bent portion that covers the header 2, and a back film portion 1b that extends downward from a bent portion that covers the header 2. ■After being reshaped into a new shape, it hangs downward,
It is provided with a tongue piece 4 extending longer than the front film part 1a, and a gusset part 5 is formed at the square-shaped bent part.

The tongue piece 4 is provided with adhesive means 6 such as an adhesive on the surface facing the front film portion 1a across the entire width thereof.

The bag body 1 is formed by welding both side edges 7, 7 as shown in the third figure.

Both side edges 7, 7, which become the fusing weld lines, are connected to the gusset portion 5 from the side edges 7a, 7a of the bent portion having the header 2.
The beveled edge 7 has a downward slope in the part where it passes through.
b, 7b, and side edges 7c, 7c extending straight downward in the main body portion.

Therefore, at the upper side edges 7a, 7a, the front and back film portions 1
a, lb and the header 2 are fused and welded together, and at the lower side edges 7c, 7c, the front and back film portions 1a, lb are fused and welded to each other.

As shown in FIGS. 1 and 4, the present invention has a bending and overlapping facing surface 5a of the film portion on the outer surface of the bag body of the gazette portion 5,
5b has at least the beveled edge 7b on either or both of them;
7b, a welding prevention part 8 is provided, so that the first
As shown in the figure, the gusset portion 5 has a substantially V shape at the beveled edges 7b, 7b.
The shape is fused and welded, but the valleys of the ■ shape are not welded.

This welding prevention part 8 can be easily obtained by applying printing ink, for example, but it is also possible to coat or interpose something that allows fusing but prevents welding of the opposing surfaces 5a and 5b. .

As described above, the bag body 1 with a bottom opening is obtained by fusing and welding the side edges 7, 7, but in the embodiment of the present invention, tongue pieces are further placed at a predetermined distance from the side edges 7, 7 as shown in the third figure. Cuts 9, 9 of a predetermined length are provided from 4 to the overlapping portion of the front and back film portions 1a, 1b.

The notches 9, 9 are formed by a cutter without heat-cutting means, and the bag portion on the side of the notches 9, 9 is made into a side folding piece 10.10, and the part between the notches 9, 9 is The bag body portion is made into a folded sealing piece 11 and 12.

Incidentally, in order to improve the fixing stability of the header 2, an additional embodiment as shown in FIG. 6 may be adopted as necessary.

In FIG. 6 (2), the front and back film portions 1a and lb are welded 13 to each other near the lower edge of the header 2, thereby enclosing the header 2 in the bent portion of both film portions 1a and lb.

Further, in FIG. 6 II, front and back film portions 1a and 1b are welded 13 to the lower edge of the header 2 and integrated.

According to the present invention based on this embodiment, when a product is inserted into the lower opening of the bag body 1 and hung for display through the hanging hole 3, the gusset portion 5 is suitably expanded to hold the product in a large capacity. can be stored.

In particular, in the present invention, as described above, the both side edges 7 that become the weld line are straight lower side edges 7c, 7 via the beveled edges 7b, 7b that cross the gusset portion 5 from the bent side edges 7a, 7a.
c, the mounting body is made wider between the lower side edges 7C and 7C than the header 2 portion, and gradually becomes wider through the beveled edges 7b, 7b. The bag body 1 can be suitably expanded from the state shown in FIG. 3 to the state shown in FIG. 1 by using the edges 7b, 7b and the lower side edges 7c, 7c as bag expansion means.

With this expansion, the gadget portion 5 is expanded, and the bag 1 can be expanded uniformly as a whole.

After storing the product, the large lower opening is folded and overlapped with the side folding pieces 10 and 10 so as to close the opening, and then the sealing folded piece on the front film portion 1a side is attached as shown in FIGS. 2 and 5. 11, the folded sealing piece 12 on the back film portion 1b side may be folded and polymerized.

The side folding pieces 10 and 10 are all equipped with adhesive means 6 at their tips, so they are adhered to each other, and the sealing folded piece 12 on the back film portion 1b side connects the adhesive means 6 at the tip to the front film portion. 1a, so that the opening of the bag 1 is completely covered.

It goes without saying that the present invention is not limited to the above-mentioned embodiments; for example, the gusset part may be formed not only by simply bending the film into a substantially square shape, but also by forming a plurality of gusset parts in a corrugated shape, such as in a substantially W shape. Even in this case, a welding prevention portion may be provided on the overlapping facing surface of each gusset portion.

As a result of the above-described structure of the present invention, in a bottom-opening bag with a header, the fusing weld lines on both side edges of the bag form a bag expansion means with the above-mentioned oblique edges and lower side edges. ,
In this part, it is possible to increase the capacity of the bag with a simple construction by fusing and welding without requiring a gusset.

By forming a gusset part below the header in addition to the expansion means, it is possible to expand the bag body uniformly as a whole, and even though the gusset is formed, the welding prevention part prevents the expansion of the gusset from occurring. Since it is not impossible, it is excellent because it can distantly achieve the intended purpose of simply manufacturing a bag body by the above-mentioned fusing and welding means.

[Brief explanation of drawings]

Fig. 1 is an upper perspective view showing the first embodiment of the present invention, Fig. 2 is a downward perspective view partially showing the bag from the rear direction, Fig. 3 is a front view of the bag, and Fig. 4 is the third embodiment of the bag. Figure 5 is an enlarged cross-sectional view taken along line IVIV, Figure 5 is a cross-sectional view taken along line ■-■ in Figure 3, showing the enlarged state of the bag body, and Figures I and II are cross-sectional views showing examples of adding the header portion, respectively. It is. 1...Bag body, 1a...Front film part,
1b... Back film part, 2... Header, 5... Gusset part, 7... Side edge, 7
b...Beveled edge, 8...Welding prevention part, 9.
...notch.

Claims (1)

[Claims for Utility Model Registration] In a bag body formed from polymerized front and back film parts, provided with a header at the upper part, and opened at the lower part; while the front film part hangs straight downward from the header, The back film part has a gusset part bent into a cross-sectional shape of a cross section below the header, and is suspended further downward from the gusset part: The front and back film parts are fused and welded at both side edges of the bag The edges on both sides, which become the fusing weld lines, are beveled edges that extend downward from the side edges of the header at the part that passes through the gusset part, and further extend straight downward at the main body part. a lower side edge; and a welding preventing portion located at least at the beveled edge of the bent and overlapping facing surfaces of the back film portion on the outer surface of the bag body of the gusset portion; Bag body.