JPH0999958A - Bag body with zipper made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly put in or take out a content while the upper end edge of a lateral gusset does not interfere with the content at the time of putting in or taking out, in a bag body with a zipper made of a synthetic resin, being equipped with a lateral gusset. SOLUTION: For a bag body 1 being equipped with a zipper made of a synthetic resin, a male and female engaging type zipper 3 is provided on the internal side of an opening part 2. Then, by folding front and rear 2 sheets of body part films (1a), (1b) of the bag body 1, into a V-shape to form 2 sheets of lateral gussets 4 respectively, on both sides of the body part films (1a), (1b), in such a manner that the length dimension may be the one by which the upper end edge may be located under the zipper 3. Then, the upper end edge of the V-shaped lateral gusset 4 is bonded so as to be closer to the respective internal surfaces of the front and rear of the two sheets of the body part films (1a), (1b) with a seal tape 8 which has a thermal bondability with the internal surfaces of the front and rear body part films (1a), (1b) and the internal surface of the lateral gusset 4, and of which the internal surfaces have a thermal bondability to each other. At the same time, the end edge of the lateral gusset 4 including the seal tape bonding part being joined is bonded. By doing so, the lateral gusset for which the two V-shapes are made a W-shape, and which is folded into a W-shape at both sides of the bag body 1, is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag body having a zipper made of synthetic resin, which is provided with a male and female bite type chuck at its opening, and lateral gussets folded in a W shape are adhered to both sides. .

[0002]

2. Description of the Related Art A bag body with a synthetic resin chuck, in which a male and female bite type chuck is provided inside an opening of a bag body and lateral gussets folded in a V shape on both sides are adhered, is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 5 (1993) -53. It is known from 97151.

[0003]

The bag body with a synthetic resin chuck having the above-mentioned known lateral gusset has a length dimension such that the upper edge of the lateral gusset is located below the chuck, and the upper end of this lateral gusset is opened. This is a structure in which the edges are adhesively sealed along the edges, and there is an advantage that the opening width can be increased over the entire width of the opening of the bag.

However, this large opening is limited to the opening of the bag and its vicinity, that is, when the opening of the bag is opened, the opening above the chuck of the bag has a large opening area. Although obtained, the upper edges of the lateral gussets on both sides project and are located in this opening area, and this interferes with the contents when the contents are taken in and out, and hinders smooth contents taking in and out. In order to avoid this interference, it has been proposed in the above-mentioned conventional example to narrow the upper edge of the lateral gusset, but this method cannot avoid a reduction in the storage volume of the contents.

An object of the present invention is to provide a bag body with a zipper made of synthetic resin, which is provided with a lateral gusset so that the opening portion of the bag body can have a large opening width over the entire width and a large storage volume of contents can be obtained. The upper edge of the horizontal gusset does not interfere with the contents when loading and unloading the contents, and enables smooth loading and unloading like a normal flat bag with a zipper without a horizontal gusset.

[0006]

Means for Solving the Problems The structure of the present invention for achieving the above object is to provide a synthetic resin zipper bag provided with a male and female bite type chuck inside the opening, with two front and back sides of the bag body. The horizontal gussets each having two leaves folded in V shape on both sides of the body film have a length dimension such that the upper edge of the horizontal gusset is located below the chuck, and a horizontal gusset having a V shape is formed. The upper and lower edges are sealed with a sealing tape that has thermal adhesiveness to the inner surface of the body film and the inner surface of the lateral gusset, and also has thermal adhesiveness to the inner surface of each body. The two V-shapes are made into a W-shape by adhering to the inner surfaces of the front and back sides of the part film and adhering the edges of the lateral gusset including the adhering seal tape adhering parts. Two
A lateral gusset formed by folding in a W shape is formed on both sides of a body film.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a front body film 1a
And a back body film 1b (the front and back of the body film are not distinguished, but for convenience of description, a bag body formed by two films, 2 is an opening, 3 is the opening 2
A chuck provided along the chuck 7 is a notch for opening which is carved on both sides (or one side) of the opening 2 so as to correspond to the planned tearing line 6 which is lined in parallel with the chuck 3 above the chuck 3. is there. Incidentally, opening means for opening the bag body 1 such as the planned tear line 6 and the notch 7 for opening are provided as necessary, and in some cases, the opening 2 is in a non-adhesive state (chuck that does not require tearing or cutting). 3 only).

Reference numeral 4 denotes a lateral gusset in which a film is folded in a V shape. As shown in FIGS. 2 and 3, the adhesive portion of the seal tape 8 of the two-leaf lateral gusset 4 folded in the V shape is formed. The opposing edges including the adhesive 51 are adhered to substantially W
It forms a letter shape.

The lateral gussets 4 are adhered 5 to both sides of the bag body 1, and the upper edge 4 of the lateral gussets 4 is bonded.
b is a length dimension located below the chuck 3, and the upper edge 4b of a two-leaf lateral gusset 4 folded in a V shape.
However, the seal tape 8 having thermal adhesiveness to the inner side surfaces of the front and back body films 1a and 1b and the inner side surface of the lateral gusset 4 and having thermal adhesiveness to each of the inner side surfaces thereof has the above-mentioned surface. The leaves are brought close to and bonded to the inner surfaces of the body film 1a and the back body film 1b, so that there is a non-bonded portion P between the two V-shapes.

This seal tape 8 is, as shown in FIG.
It may be a series of tapes over the entire width L2 of the bag body 1 including the adhesive portions 51 on both sides, or a short tape at the upper edge 4b of the lateral gusset 4 as shown in FIG.

Further, the horizontal gusset film which is in contact with the front body film 1a and the back body film 1b is placed from the position where the upper edge 4b of the horizontal gusset 4 and the folding ridge line 4a intersect to the side bonding 5 of the bag body 1. It may be diagonally bonded 4d. In addition, L1 of FIG. 1 shows the entire width of the opening 2 of the bag 1.

As shown in FIG. 3, when the bag body 1 is inflated by the contents and the lateral gusset 4 is expanded to perform its function, the upper edge 4b of the lateral gusset 4 is located below the chuck 3. Since it is located, the opening 2 of the bag 1
Has a large opening over its entire width L1. Moreover, when the inside of the bag body 1 is viewed in the opened state, in particular, on both sides of the bag body 1, as shown in FIG. 2, each of the V-shapes has a front body film 1a and a back body film 1b.
Since the inner surface of the horizontal gusset is adhered to the inner surface of the horizontal gusset 4c, it has an opening state similar to that of a normal flat bag with a zipper without a horizontal gusset, that is, the contents are the upper edge 4b of the horizontal gusset 4.
You can get in and out smoothly without interfering with.

Further, a lateral gusset film which is in contact with the front body film 1a and the back body film 1b is bonded to the side 5 of the bag 1 from the position where the upper edge 4b of the lateral gusset 4 and the folding ridge line 4a intersect. By diagonally adhering 4d toward the front body film 1a and the back body film 1b and the triangular corner gaps in the vicinity of the upper edge 4b of the horizontal gusset 4, the contents are crushed, especially when taking out the contents, especially the powder,
Prevents the entry from being obstructed by entering the triangular corner gap.

In the present invention, from the viewpoint of facilitating production, it is desirable that the film is composed of the following multilayer film. That is, as shown in FIG. 4, the front body film 1a and the back body film 1b have a multi-layered structure including an outer film 10a and an inner film 10b, and the lateral gusset 4 has a structure shown in FIGS. As shown in FIG. 7, it has a multilayer structure including an outer film 11a and an inner film 11b.

The inner film 10b of the body film and the inner film 11b of the lateral gusset which constitute the inner side
Are 10b and 10b, 11b and 11b and 10b and 1
1b is a resin layer having good thermal adhesiveness to each other, for example, low-density polyethylene (hereinafter abbreviated as LDPE),
Polypropylene, ethylene vinyl acetate copolymer (hereinafter E
It is abbreviated as VA. On the other hand, the outer film 10a of the body film forming the outer side and the outer film 11a of the lateral gusset do not heat-bond under the same conditions as the heat-bonding of the film forming the inner side.
For example, polyester (hereinafter abbreviated as PET), polyamide, paper, aluminum foil or the like is selected to impart desired performance such as heat resistance, air resistance, light shielding property, aroma retaining property, and mechanical strength to the packaging bag. It is made of multi-layer or multi-layer material.

As shown in FIGS. 2 and 5, the sealing tape 8 has, for example, a linear low-density polyethylene (hereinafter abbreviated as LLDPE) having a high melting point on one side 8a and a high melting point. The other one surface 8b has a lower melting point than the one one surface 8a side, and has a good thermal adhesiveness to the inner film 11b of the lateral gusset 4 and the inner film 10b of the body film, for example, a multilayer of EVA or LDPE. is there.

Then, as described above, the sealing tape 8
The one surfaces 8a of the two have thermal adhesiveness to each other, that is, are bonded 51 on both sides of the bag body 1 to form a W-shaped lateral gusset having the non-bonded portion P.

Due to the multi-layer structure of the front and back body films 1a and 1b, the lateral gusset 4 and the sealing tape 8, the films having good thermal adhesiveness are fused and adhered to each other at a portion requiring thermal adhesion. Areas that should not be heat-bonded will not bond under those conditions.

That is, the portion indicated by a cross mark in FIGS. 2 and 4 to 7 is a portion where good and reliable thermal bonding is desired, and the non-bonded portion shown in FIGS. 2, 6 and 7. Plays an important role in expanding the contents when they are stored and forming a large bulge. Therefore, it is a part that should not be heat-bonded, and is indicated by a cross mark as described above. The material is selected so that the part does not form a bond under good conditions and reliable heat bonding.

Although the above-described embodiment of the present invention has been described and developed with particular attention paid to facilitating the complexity of manufacturing, the invention is not limited to this embodiment, and the goodness as a product is brought out. Due to considerations such as the material composition, single layer, multiple layers, this multiple layer is not only laminated by film, but also multiple layers by coating, multiple layers by extrusion, application of adhesive layer, release agent layer, etc. It is possible to deal with

[0021]

As described above, according to the present invention, the upper end edge of the lateral gusset film is stopped at the position below the chuck of the opening of the bag body, and the lateral gusset folded in the W shape is formed into the W shape. The V-shape is divided into two V-shapes through the non-adhesive portion P, and the V-shapes are formed on the front and back body films 1a and 1b.
Since the side gussets that are folded in a W shape are formed on both sides of the bag body by adhering to and adhering to the inner surface of the bag body, the opening portion of the bag body has a large opening over its entire width, and Looking inside the bag, since the upper edge of the horizontal gusset is adhered to the inner surface of the front body films 1a and 1b as described above, it is almost the same as a normal flat bag with a zipper without a horizontal gusset. When the contents are taken in and out, the contents can be smoothly taken in and out without the contents interfering with the upper edge 4b of the lateral gusset 4.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of a bag according to the present invention.

2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic perspective view of the bag body in a full state.

4 is an enlarged sectional view taken along line BB of FIG.

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

6 is an enlarged cross-sectional view taken along the line DD of FIG.

FIG. 7 is an enlarged sectional view taken along line EE of FIG.

FIG. 8 is a front view showing a modified example of the bag body of the present invention.

[Explanation of symbols]

 1 Bag 1a Front Body Film 1b Back Body Film 2 Opening 3 Chuck 4 Horizontal Gazette 4a Ridge 4b Top Edge 4c Adhesive 4d Oblique Adhesive 5 Adhesive 51 Adhesive 8 Sealing Tape P Non-adhesive

Claims (1)

[Claims] 1. A bag body with a synthetic resin chuck having a male and female occlusal type chuck inside the opening, and two leaves each of which are V-shaped folded on both sides of a body film having two front and back sides of the bag body. Has a length dimension such that the upper edge of the lateral gusset is located below the chuck, and V
A sealing tape having an upper edge of a horizontal gusset having the shape of a letter "H" to the inner surface of the body film and the inner surface of the horizontal gusset, and also having a heat adhesive property to each of the inner surfaces thereof. The two V-shapes are formed into a W-shape by adhering to the inner surfaces of the two front and back body films by adhering to each other, and by adhering the edges of the lateral gussets including the seal tape adhering portions facing each other. A bag body with a zipper made of synthetic resin, characterized in that lateral gussets folded in a W shape are formed on both sides of the body film on the front and back of the bag body.