JPS5933786Y2 - 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 fuse and weld polymerized front and back film parts to form a bag.

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

However, when providing the gusset part on the bag body in this way, if the gusset part is simply provided at an arbitrary position, since the film part constituting the bag body is extremely thin, the film part near the unfolded gusset part will be There is a disadvantage that distortion occurs and the bag as a whole cannot be expanded properly.

Therefore, it is thought that it is advantageous to provide a header at the top of the bag body and provide a gusset part located at a shoulder near the bottom of the header, since the unfolded gusset part is retained in shape by the header. .

However, in this case, there is a problem in that the fusing weld line of the bag crosses the gusset part, and the films that are bent and polymerized at the fusing part, which threatens the gusset part, are all welded together in a sandwich-like manner.

This has the disadvantage that the gusset cannot be expanded to a predetermined and expected state, and while the gusset is expanded in areas that are not located at the weld line, the gusset is not expanded in the integrated welded area. First, there is a problem in that the entire bag is distorted.

In view of the above, the present invention provides a gusset section located at the shoulder near the bottom of the header in a mass-produced bag made by melting and welding a film, thereby making it possible to unfold the gusset section in an orderly manner. It is an object of the present invention to provide a bag with a gusset in which the gusset portion can be suitably expanded to a desired state even at the melted portion.

Below, each embodiment of the present invention will be described in detail based on the drawings.
In the first embodiment shown in FIGS. 1 to 3, a bag 1 is formed by folding a continuous synthetic resin film in half at the upper part and polymerizing the front and back film parts 1a and 1b.

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.

The header 2 may be made of a thick synthetic resin sheet or synthetic paper sheet, as long as it is relatively strong, can be thermally cut, and can be welded to the film.

The bag body 1 has a shoulder portion 4 in the lower vicinity of the header 2.

In the illustrated example, the front film part 1a hangs straight downward from the bent part that covers the header 2, while the back film part 1b hangs down from the bent part that covers the header 2 at the shoulder part 4. It is bent downward into an approximately ■ shape and then hangs downward, and is further bent into an approximately inverted M shape at the bottom, with a shoulder gusset part 5 at the ■ shaped bent part and a bottom gusset part at the obovoid bent part. Section 6 is formed.

The front film part 1a is provided with a tongue piece 7 extending downwardly from the bottom part gusset part 6, and the tongue part 7 and the bottom part are connected to the gusset part 6.
An opening opening in the width direction of the bag body is formed between the tongue piece 7 and an adhesive means 8 such as an adhesive is provided over the entire width at the tip of the surface of the tongue piece 7 facing the back film part 1b.

The tongue piece 7 is bendable and superimposed on the bottom gusset part 6 and can be adhesively bonded by adhesive means 8, thereby closing the opening.

The bag body 1 is formed by welding both side edges 9, 9 together as shown in the second figure.

The side edges 9, 9 which become the fusing weld line are the upper diagonal edges 9b which extend downward outward from the side edges 9a, 9a of the bent portion having the header 2 in a portion that crosses the shoulder gusset portion 5. , 9b, side edges 9c, 9c extending straight downward in the main body portion, and lower beveled edges 9d, 9d narrowing downward inward at a portion crossing the bottom gusset portion 6. be done.

Therefore, at the upper side edges 9a, 9a, the front and back film portions 1
a, lb and the header 2 are melted and welded together, and at the lower side edges 9C, 9C, the front and back film portions 1a, lb are melted and welded to each other.

However, in the gusset portions 5.6, as shown in FIGS. 1 and 3, the folded and overlapping facing surfaces of the film portions on the outside surfaces of the bag bodies of the gusset portions 5, 6 have at least a beveled edge on both or one of them. Welding prevention parts 1 located at 9b and 9d
Therefore, as shown in the first diagram, the gazette part 5
．． 6 is fused and welded in a substantially square shape at the oblique edges 9b and 9d, but is not welded at the valley portion of the square shape.

This welding prevention part 10 can be easily obtained by applying printing ink, for example, but it may be coated with or interposed with something that allows fusing but prevents welding.

FIG. 4 shows a second embodiment of the present invention, which is based on the same basic form as the first embodiment, and similar components are designated by the same reference numerals.

Therefore, only the different parts from the first embodiment will be explained.
Back film portion 1b folded back via bottom gusset portion 6
has an extension film section 11 that extends further upward, whereas the front film section 1a is a short one that is superimposed on the outside of the extension film section 11.

The front film portion 1a and the extension film portion 11 are spaced apart from each other and form openings that open in the width direction of the bag, and one or both of the opposing surfaces of both film portions 1a and 11 are bonded with adhesive or the like. Means 12 are provided over the entire width of the bag.

This allows the front film portion 1a to be polymerized and adhered onto the extension film portion 11.

Further, on one or both of the opposing surfaces of the front film portion 1a and the extension film portion 11, welding prevention portions 13 are provided at the bag side edges 9, 9.

This welding prevention part 13 is connected to the already explained gusset parts 5 and 6.
This allows the front film portion 1a to be freely peeled off from the extension film portion 11, allowing the bag body 1 to be opened.

FIG. 5 shows a third embodiment of the present invention, which is based on the same basic form as the second embodiment, and similar components are designated by the same reference numerals.

Therefore, only the different parts from the second embodiment will be explained.
The front film portion 1a is formed to be shorter than the extension film portion 11 of the back film portion 1b so as to overlap within the bag body 1.

As described above, the adhesion means 12 and the welding prevention part 13 are provided on one or both of the facing surfaces of the front film part 1a and the extension film part 11.

Regarding the first to third embodiments of the present invention, the header 2
In order to improve the stability of the fixing state, an additional embodiment as shown in FIG. 6 may be adopted as necessary.

In FIG. 6I, the front and back film portions 1a, lb are welded 14 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, lb.

Further, in FIG. 6 II, the front and back film portions 1a and 1b are welded 14 to the lower edge of the header 2 to be integrated.

As a result of the above-described configuration, the present invention is advantageous in that it can provide a large capacity product storage space in a bag whose opening can be freely opened and closed, since the bag is provided with a gusset section.

In particular, since the gusset section is provided on the shoulder near the bottom of the header, when the gusset section is unfolded to store the product, the upper part of the film constituting the gusset section is held by the header.
The bag is unfolded below the strong header, and is unfolded along the lower edge of the header using the lower edge of the header as a guide, so that the gusset part can be unfolded over the entire width of the bag in an orderly manner, giving it a beautiful appearance and a suitable product. A storage space can be created.

Moreover, the gusset part can be freely expanded through the welding prevention part even if it is on the fusing line of the bag body, and therefore, although it is a bag body with a gusset, it is suitable for mass production by fusing and welding the film, and is inexpensive in large quantities. It is excellent as it can be provided to

[Brief explanation of drawings]

Fig. 1 is a diagonal button diagram showing the first embodiment of the present invention, Fig. 2 is a rear view thereof, Fig. 3 is a cross-sectional view taken along the line III--III of Fig. 2,
FIG. 4 is a longitudinal sectional view showing the second embodiment, FIG. 5 is a longitudinal sectional view showing the third embodiment, and FIGS. 6 I and II are main parts showing additional embodiments to the first to third embodiments. It is an enlarged longitudinal cross-sectional view. 1...Bag body, 2...Header, 4...
... Shoulder part, 5, 6... Gazette part, 9, 9.
...Both side edges, 10...Welding prevention part.

Claims (1)

[Scope of utility model registration request] In a bag body in which the front and back film parts folded and polymerized at the upper part of the bag are fused and welded at both side edges, a thick sheet is interposed between the folded and overlapped parts of the front and back film parts to form a header. and a hanging hole is opened through the header,
A lower portion near the header of the bag is defined as a shoulder, and a gusset portion is provided in the width direction of the bag by bending at least one film portion into a corrugated cross section located at the shoulder; fusing weld lines on both sides cross the gusset part,
A bending and overlapping facing surface of the film portion on the outer surface of the bag body of the gazette portion is provided with a welding prevention portion located at least at the fusing weld line, and a part of the front and back film portions are separated from each other to form a bag body. Adhesive means that forms an opening that opens in the width direction, is located in a film portion that covers the edge of the opening, is configured to allow one film portion to overlap the other film portion, and adheres both film portions to each other. A bag with a gusset, characterized by comprising: