JPH0633091B2 - Gassho back seal bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flexible packaging bag suitable for containing confectionery breads, vegetables, frozen foods, and other processed products, including a back seal portion of the bag. The present invention relates to a double-sealed back seal bag that can be opened easily and easily, and that the opened portion looks good after opening, and that an outer box can be opened simultaneously for simultaneous opening.

[Conventional technology and problems]

Conventionally, flexible packaging bags have been used in various fields such as ramen packaging and confectionery packaging. In the case of back-sealing in this packaging bag, generally, envelope sticking or piling is carried out, but piling is superior in terms of sealing property and manufacturing cost. However, when trying to open from the back seal part, in the case of sticking envelopes, since the front and back of the side edges are superposed and pasted to seal the back, it is relatively easy to pinch and tear the superposed top side edge. On the other hand, in the case of affixing a palm, the film on one side of the back-sealing seal is in the opposite direction to the tearing direction, and therefore the film could not be opened without forcing the film.

In order to deal with this, notches and cuts were engraved on the back seal part to improve it (No. 53-75314, No. 55-184, No. 55-184).
No. 78), the engraved part will identify the opening position,
As a result, the opening / closing operation of the back seal from the free position is restricted. In addition, it requires additional die and process for cutting and notching, which causes a rise in manufacturing cost and when packaging the bag in the outer box, it takes time to align the opening part of the outer box with the notch for opening. There were also internal problems.

[Means for solving problems]

As a result of various studies to improve the unsealing property in the back seal portion of the gas-sealed back seal bag, the present invention has variously improved the layer structure of the film to facilitate easy-opening regardless of the notch-free gas-sealed sticking. As a concrete means, a synthetic resin layer capable of being heat-sealed on the innermost surface by interposing a directional synthetic resin layer,
A bag made of a composite sheet having a fibrous layer on the outermost surface, wherein side edges of the composite sheet are heat-sealed to form a palm-sealed back seal in which the directionality of the intervening synthetic resin layer is eliminated. It is a joint back seal bag characterized by folding the back seal portion to one side.

〔Constitution〕

An embodiment of the configuration of the present invention will be described with reference to the drawings.
The figure is a perspective view of the bag 1 of the present invention, in which side edges of the composite film are heat-sealed to form a back seal which is attached to the palm in the longitudinal direction of the bag cylinder. FIG. 2 is a cross-sectional view of the bag 1 taken along the line AA, in which the side edges 11 and 12 of the composite film are joined in the same direction and heat-sealed, and then folded to one side. The other opening that does not become the opening is sealed by a known means.

For the outermost surface, a fibrous sheet, for example, thin paper or cellophane having a basis weight of 40 g / m ² or less, preferably 20 g / m ² , such as glassine, pure white roll, film-making paper, parchment paper, and Japanese paper can be used.

The innermost surface is a heat-sealable synthetic resin, such as polyethylene (PE), unstretched polypropylene (CPP), ethylene vinyl acetate copolymer (EVA), ionomer, low density polyethylene (LDPE), high density polyethylene (HDPE). , Other thermoplastic resins can be used.

As the packaging material laminated between the outermost surface and the innermost surface, a stretchable film, an unstretched film, an aluminum foil, an aluminum vapor deposition film or the like is interposed, and the above-mentioned HDPE as a directional stretchable film, OPP (stretched polypropylene), nylon, etc. can be used. The direction of the stretchable film is set to be perpendicular to the longitudinal direction of the bag back seal. However,
When it is necessary to open the bag cylinder obliquely, a stretched film in which the direction is inclined may be used. It should be noted that when the thin paper is laminated on the outermost surface, various printings can be performed and various designs can be made, which gives flexibility and elasticity, and the adhesion work is easy even when the thin paper is installed in the outer box. The order of forming each layer is not particularly limited, but a composite material made of 18 μm uniaxially stretched film and 20 μm PE is applied by dry lamination to a composite material in which thin paper with a basis weight of 20 g / m ² and 7 μm aluminum foil are adhered with a paste. Matching is one example.

[Action]

FIG. 3 is an explanatory view showing a state where the bag 1 of FIG. 2 is opened from a part of the back seal. When attempting to open the back seal into a strip, first reverse the part of the back seal that is folded down to one side to start cutting from the end of the back seal and run the top end together with the bottom end in the opening direction. Then, the seal end is temporarily stopped by pulling the end on the lower surface side, and when further running, the seal end portion on the end on the lower surface side is cut in the vertical direction, and subsequently the bag body is unwound and unsealed. The back seal part is very easily cut because the directionality of the directional film that was interposed by the heat at the time of heat sealing disappears, and after cooling, the film of the back seal part hardens, and conversely This is because cutting at the seal portion, together with the hardening phenomenon, facilitates cutting at the seal end portion 13. In order to further improve the cuttability, it is preferable that the seal end is previously folded down to one side to give a fold (see FIG. 2). This fold is useful for reversing the back seal portion and cutting and opening at once. In particular, once the thin paper or aluminum foil on the outermost surface is given a fold, the folded part of the thin paper or aluminum foil, which has poor restorability, becomes fragile, so it is extremely easy to cut by folding it in the opposite direction. . A directional film interposed in the middle of the composite material is suitable for realizing a smooth and stable band-shaped opening of the bag cylinder. In the above description, only the heat sealing method was described as the sealing method, but the gist of the present invention is not limited to this. At least known heat sealing methods such that the directionality of the back seal portion disappears, for example, sealing methods such as impulse seal, fusing seal, impulse fusing seal, frame seal, heat melting seal, ultrasonic sealing, and high frequency sealing can be used. It is a thing.

The bag of the present invention as described above can be used not only by itself, but can also be installed in the outer box described in JP 59-11072 or JP 55-107636 proposed by the applicant. This is a versatile packaging bag that can be opened simultaneously with the band-shaped zipper for opening the outer box.

〔The invention's effect〕

According to the present invention having the above configuration, the following effects are brought about.

That is, according to the present invention, it is possible to ensure a high barrier property with less frequency of pin poles than in the conventional easy open by sticking envelopes, and it is not necessary to provide cuts, notches, or cut tapes, thereby reducing manufacturing costs. This contributes to the efficiency of workability. Further, the opening in the back seal portion of the bag is performed very smoothly and stably, and if necessary, the bag can be opened simultaneously with the outer box by attaching the inner bag to the outer box. . Furthermore, since the thin paper is the outermost layer, it can be extremely easily attached to the outer box, and various printings can be performed, which allows versatile design and makes it a versatile and useful bag. .

[Brief description of drawings]

The drawings show an embodiment of a gastric back seal bag according to the present invention, FIG. 1 is a perspective view of the bag, and FIG. 2 is a sectional view of the bag AA,
FIG. 3 is a sectional explanatory view showing a state in which a part of the bag back seal portion is opened. 1 …… Bag, 2 …… Back seal, 11 …… End of upper surface, 12 ……
Bottom end, 13 …… Seal end.

Claims (4)

[Claims] 1. A bag made of a composite sheet having a heat-sealable synthetic resin layer on the innermost surface and a fibrous layer on the outermost surface with a directional synthetic resin layer interposed, and the side edges of the composite sheet. Is a heat-sealed back seal in which the directionality of the intervening synthetic resin layer is eliminated, and the back seal portion is folded down to one side. 2. The joint back spine bag according to claim 1, wherein thin paper is laminated as the fibrous layer. 3. The joint back seal bag according to claim 1 or 2, wherein a uniaxially stretched polyethylene film is laminated as the directional synthetic resin layer. 4. The back seal bag according to claim 1, 2, or 3, wherein an aluminum foil or an aluminum vapor deposition film is interposed in the composite sheet.