JP3563380B2 - Bag with synthetic resin zipper - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bag with a synthetic resin chuck having a male / female occlusal type chuck in the opening and bonded to a V-shaped horizontal gusset on both sides.
[0002]
[Prior art]
A bag with a synthetic resin chuck in which a male / female occlusal type chuck is provided inside the opening of the bag, and a lateral gusset folded in a V-shape is bonded to both sides is disclosed in, for example, JP-A-5-97151. is there.
[0003]
[Problems to be solved by the invention]
In the bag body with a synthetic resin chuck having the above-mentioned known horizontal gusset, the upper edge of the horizontal gusset has a length dimension located below the chuck, and the open end edge of the upper end of the horizontal gusset is adhered along the edge. It has a sealed structure, and there is an advantage that the opening width of the bag body can be made large over the entire width.
[0004]
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. However, since the upper edges of the lateral gussets on both sides protrude within the opening area, the contents interfere when the contents are taken in and out, and hinder the smooth taking in and out of the contents. In order to avoid this interference, the prior art proposes to narrow the upper edge of the horizontal gusset, but according to this method, it is inevitable to reduce the volume of contents.
[0005]
An object of the present invention is to provide a bag with a synthetic resin chuck provided with a horizontal gusset in which the opening of the bag can have a large opening width over the entire width and a large storage volume of the contents can be obtained. The upper end edge of the bag does not interfere with the contents when the contents are taken in and out, so that the contents can be smoothly taken in and out in the same manner as a normal flat bag with a chuck without a horizontal gusset.
[0006]
[Means for Solving the Problems]
According to a configuration of the present invention for achieving the above object, a male and female occlusal type chuck is provided inside the opening of the bag body of the two body films having a heat-adhesive resin layer on the inner surface, On both sides, a horizontal gusset whose inner surface is a resin film having thermal adhesion to the inner surface of the body film, and which is folded in a V-shape with the outer surface inside, the upper edge of which is lower than the chuck The upper edge of the horizontal gusset is brought into contact with one of the inner surfaces of the two body films, and is thermally bonded to the inner surface of the body film and the inner surface of the horizontal gusset. A sealing tape formed of multiple layers of a thermo-adhesive resin film having one side and the other side having a difference in melting point, including a gap between the upper edge of the chuck and the horizontal gusset. The top edge of the horizontal gusset or its surroundings It is obtained by covering the adhesive.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the present invention, wherein 1 is a bag formed of two films, a front body film 1a and a back body film 1b, 2 is an opening, and 3 is A chuck 7 is provided along the opening 2, and an opening 7 is engraved on both sides (or one side) of the opening 2 so as to correspond to a predetermined tearing line 6 parallel to the chuck 3 above the chuck 3. It is a notch. Note that the opening notch 7 is not necessarily engraved, but may be provided with scissors marks and an explanatory print of “Please cut from here” at one end of the planned tear line 6. In addition, an open state which does not require cutting or cutting may be used.
[0008]
Reference numeral 4 denotes a horizontal gusset formed by folding a film into a V-shape, and is bonded to both sides 5 of the bag 1. The horizontal gusset 4 has a folding ridge line 4 a parallel to a line of the side 5 of the bag 1, and an upper edge 4 b of the horizontal gusset 4 has a length dimension located below the chuck 3. As shown in FIG. 1, the upper edge 4b has a structure in which the upper edge 4b is bonded 4c only to the inner surface on the side of the front body film 1a. In this embodiment, the upper edge 4b of the horizontal gusset 4 is bonded only to the inner surface on the side of the front body film 1a, so that the inner surface of the body film and the inner surface of the horizontal gusset have thermal adhesive properties. The upper edge 4b of the horizontal gusset 4 including the space between the chuck 3 and the upper edge 4b of the horizontal gusset 4 and the periphery thereof are adhered and adhered by a seal tape 8 having the following. The sealing tape 8 may be a series of tapes extending over the entire width L2 of the bag body 1 including the side 5 as shown in FIG. 1, or may cover only the upper edge 4b of the horizontal gusset 4 and its periphery as shown in FIG. A short tape to be adhered may be used. In addition, it may be bonded only to the inner surface on the side of the back body film 1b. In short, it is to be bonded to only one of the front and back two body films 1a and 1b.
[0009]
Further, this embodiment is constituted by the following multi-layer film in view of simplification in production. That is, as shown in FIG. 3, the front and back torso films 1a and 1b have a multilayer structure composed of an outer film 10a and an inner film 10b, and the horizontal gusset 4 has a structure as shown in FIGS. The outer film 11a and the inner film 11b have a multilayer structure.
[0010]
The inner film 10b of the body film constituting the inner side and the inner film 11b of the horizontal gusset are formed of a resin layer having good thermal adhesion to each of 10b and 10b or 10b and 11b, for example, a low-density polyethylene (hereinafter, referred to as a low-density polyethylene). LDPE), polypropylene, ethylene-vinyl acetate copolymer (hereinafter abbreviated as EVA), and the outer film 10a of the body film and the outer film 11a of the horizontal gusset forming the outer side constitute the inner side. For example, polyester (hereinafter abbreviated as PET), polyamide, paper, aluminum foil, or the like is made of heat resistance, airproofness, light shielding properties, scent retention, etc. It is formed from single or multiple layers of materials selected to provide the packaging bag with the desired performance such as mechanical strength. That.
[0011]
In particular, as shown in FIGS. 4 and 5, one side 8a of the sealing tape 8 is made of, for example, a linear low-density polyethylene (hereinafter, abbreviated as LLDPE) having a heat bonding property and a high melting point, and the other one side 8b. Is composed of multiple layers of, for example, EVA or LDPE, which has a lower melting point than the one side 8a and has good thermal adhesion to the inner film 11b of the horizontal gusset 4 and the inner film 10b of the front body film 1a. .
[0012]
Due to the multilayer structure of the front and back torso films 1a and 1b, the horizontal gusset 4 and the seal tape 8, films having good thermal adhesiveness are fused and bonded to each other at a site where thermal bonding is required. In the area where it is not allowed, it does not adhere under that condition.
[0013]
That is, as shown in FIG. 3, the side 5 of the bag body 1 is fused and bonded between the films having good thermal adhesiveness of the inner film 10b, and as shown in FIG. On the side 5 of the interposed bag 1, the front body film 1a side is fused and bonded to each other with the heat-adhesive films of the inner film 10b of the front body film 1a and the inner film 11b of the horizontal gusset 4.
[0014]
On the back body film 1b side, the inner film 10b of the back body film 1b and one surface 8a of the sealing tape 8 are fused and bonded, and the other surface 8b of the sealing tape 8 and the inner film 11b of the horizontal gusset 4 are bonded. Then, the inner film 10b of the front body film 1a is fused and bonded, and the contact portion of the outer film 11a of the horizontal gusset 4 is not bonded.
[0015]
Further, as shown in FIG. 1, the horizontal gusset film, which is in contact with the front body film 1a on the side to which the upper edge 4b of the horizontal gusset 4 is bonded, is moved from the upper edge 4b of the horizontal gusset 4 to both sides 5 of the bag body 1. Although the oblique bonding 4d may be applied to the front body film 1a, the inner film 11b of the horizontal gusset 4 is fused and bonded to the inner film 10b on the front body film 1a side as shown in FIG. .
[0016]
FIG. 2 shows a state in which the bag 1 having the structure of the embodiment of the present invention shown in FIG. 1 is swelled with the contents, and the horizontal gusset 4 expands to fulfill its function. In this case, the adhesive strength of the upper edge 4b of the horizontal gusset 4 to the inner surface on the side of the front body film 1a is secured by the seal tape 8 for covering and bonding the upper portion of the horizontal gusset 4, and the seal tape 8 is formed by the diagonal adhesive 4d. Alleviates stress concentration on the fixed part due to In addition, the oblique bonding 4d crushes the triangular corner gap between the front body film 1a and the upper edge 4b of the horizontal gusset 4, and when the contents, especially powder, etc. are taken out, enters the triangular corner gap and takes out. Prevent being hindered.
[0017]
Therefore, since the upper edge 4b of the horizontal gusset 4 is located below the chuck 3, the opening 2 of the bag body 1 is largely opened over the entire width. Moreover, as shown in FIGS. 1 and 2, the upper edge 4b of the horizontal gusset 4 is adhered only to the inner surface on the side of the front body film 1a, so that the upper edge 4b of the horizontal gusset 4 is adhered. Is located in parallel to the inner surface of the front body film 1a side, and is in the same open state as a normal flat bag with a chuck without a horizontal gusset, and the contents are horizontal gusset. 4 can be smoothly taken in and out without interfering with the upper end edge 4b.
[0018]
【The invention's effect】
As described above, according to the present invention, the upper edge of the horizontal gusset is stopped at a position below the chuck of the opening of the bag body, and the upper edge of the horizontal gusset is moved toward one of the inner surfaces of the front and rear two body films. Seal having thermal adhesion to the inner surface of the body film and the inner surface of the horizontal gusset, and having one side and the other side formed of multiple layers of a heat adhesive resin film having a difference in melting point. Since the upper portion of the horizontal gusset is covered and adhered with tape, the horizontal gusset has a form in which the upper end edge thereof is secured to only the inner surface of the body film on one side with adhesive strength, and the opening of the bag body is opened. When opening, the opening width is obtained over the entire width, and the upper edge of the horizontal gusset does not interfere with the contents when taking in and out of the contents. To You can smooth a out, moreover large storage volume of the contents is obtained. Further, the sealing tape has a thermal adhesive property with the inner surface of the body film and the inner surface of the horizontal gusset, and one side of the one side and the other side have a difference in the melting point between the resin film. Therefore, films having good thermal adhesiveness are fused and bonded to each other in a region where thermal bonding is required, and non-bonded in a region where thermal bonding is not allowed under such conditions. Therefore, the manufacturing process for thermally bonding the seal tape to the inner surface of the body film and the inner surface of the horizontal gusset can be simplified and facilitated, thereby improving productivity and reducing costs. As described above, since the upper edge of the horizontal gusset does not interfere with the contents when the contents are taken in and out, the folding width of the horizontal gusset may be adjusted to be relatively large to further increase the storage volume. it can.
[Brief description of the drawings]
1 is a partially cutaway front view showing an embodiment of the bag of the present invention; FIG. 2 is a perspective view of the bag shown in FIG. 1 in an expanded state; FIG. 3 is an enlarged sectional view taken along the line BB of FIG. 1; FIG. 5 is an enlarged sectional view taken along line CC of FIG. 1. FIG. 5 is an enlarged sectional view taken along line DD of FIG. 1. FIG. 6 is an enlarged sectional view taken along line EE of FIG. Enlarged sectional view [FIG. 8] Front view showing a modified example of the bag body of FIG.
REFERENCE SIGNS LIST 1 bag body 1a front body film 1b back body film 2 opening 3 chuck 4 side gusset 4a ridge 4b upper edge 4c bonding 4d diagonal bonding 8 seal tape 8a one side 8b of LLDPE with high melting point 10b single side 10a of EVA with low melting point PET Outer film (body film)
10b LDPE inner film (body film)
11a PET outer film (horizontal gusset)
11b LDPE inner film (horizontal gusset)

Claims (1)

Male and female occlusal type chucks are provided inside the opening of the bag body of the two body films having a heat-adhesive resin layer on the inner surface, and the inner surface is formed on both sides of the bag body by the inner surface of the body film. A lateral gusset folded in a V-shape with a resin film having a side surface and a thermal adhesive property, with the outer side facing inside, is bonded with a length dimension such that an upper end edge is located below the chuck, and The upper edge is brought close to one of the inner surfaces of the front and back two body films, and has an adhesive property with the inner surface of the body film and the inner surface of the horizontal gusset, and one side and one side of the other. Is a sealing tape formed of a plurality of layers of a heat-adhesive resin film having a difference in melting point, covering and adhering the upper edge of the horizontal gusset including the upper edge of the horizontal gusset and the periphery thereof, including the gap between the chuck and the upper edge of the horizontal gusset. Characterized by synthetic resin Bag body of Tsu with a click.

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