JPH0632359A - Packaging bag - Google Patents

Abstract

PURPOSE:To provide a packaging bag capable of being easily opened and resealed. CONSTITUTION:A packaging bag 1 formed by heat sealing is provided with a tape-like material 4 interposed between the sealed layers and easily separable therefrom on at least a heat sealing part A intended for the bag opening. This easily separable material 4 consists of the outer layer having a layer heat sealable to the heat sealing layers 2 of the bag and the inner layer having a single easily separable layer constituted of a pressure-sensitive adhesive layer and a partial resin layer weaker in adhesive strength than this adhesive layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag which has a high sealing property, can be easily peeled and opened, and can accommodate all kinds of articles such as foods, medicines, electronic parts, etc., and can be re-bonded and re-sealed after opening.

[0002]

2. Description of the Related Art Conventionally, a method for forming an opening by opening a bag in which the contents are hermetically sealed by heat sealing is as follows. That is, (1) Destruction of the heat seal part. (2) A notch or similar tearing trigger is provided, and the bag is torn from there.

For resealing, it is common to use plastic fasteners.

[0004]

In order to form the opening by the former method (1), it is necessary to make the heat-sealing strength considerably small. Therefore, a liquid material package or a heavy material which requires a high heat-sealing strength. It cannot be applied to packaging and retort packaging. In addition, the heat sealing strength of the planned opening easily varies, so it is often difficult to open it, and if you try to open it forcibly, the bag will be destroyed, the contents will be scattered, and you will not be able to use it. It tends to be.

On the other hand, in the latter case, since a part of the bag is torn, a considerable force is required for tearing, and it is difficult to tear in a desired direction, so that the state of the opening is not constant and the contents are It is easy to lead to accidents that cause scattering. Therefore, use a material that has been strongly stretched substantially parallel to the tearing direction,
Or a method of tearing in a desired direction by a combination of stretching directions,
Alternatively, a method using perforations for controlling the tearing direction, a plastic-based reinforcing material, and the like have been proposed, but the effect is not sufficient although the cost is increased.

[0006] Regarding the resealing with the fastener made of plastic, the increase in cost is the biggest problem. In addition, the fitting becomes difficult as the length of the fastener becomes long, and especially the fingertips of the aged and sick are not so free. The fitting was difficult for a person.

Therefore, an object of the present invention is to provide food, medicine,
In a hermetically-sealed bag that stores all kinds of items such as electronic parts, basically, an opening for easily taking out the contents can be formed by breaking the heat-sealing part, and the contents are scattered outside the bag. An object of the present invention is to provide an easy-open bag that does not fail to open and can be easily resealed.

[0008]

In order to solve the above-mentioned problems, in the present invention, the heat sealing layer of the heat sealing portion can be heat-sealed to the scheduled heat sealing portion of the hermetically sealed packaging bag formed by heat sealing. Adhesion that can be peeled by hand by providing a heat-bonding layer on the outermost layer and the innermost layer, and forming a single easy peeling layer consisting of a pressure-sensitive adhesive layer and a partial resin layer having weaker adhesive strength The tape-like easy-to-peel material that was adjusted to the force was provided by heat fusion.

Further, the tape-like easy-peelable material can be provided so as to protrude inside the bag body rather than the heat-sealed portion of the bag body.

[0010]

Since the tape-like easy-to-peel material is provided in the opening portion of the bag, the bag can be easily and reliably opened from the outside of the bag by hand. Further, the tape-like easily peelable material for interlayer delamination causes interlayer delamination even when the internal pressure exceeds a certain level during cooking in a microwave oven or the like, and the tape can be opened.

Since the tape-like inter-layer easily peelable material is composed of a pressure-sensitive adhesive layer and a partial resin layer having a weaker adhesive strength than that, resealing is also possible.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 are front views of the easy-open bag 1, in which the contents 3 are hermetically housed by the heat-sealing portion 2. In the portion A, the heat-sealing portion 2 is formed by the heat-sealing layer (described later) of the tape-shaped easily peelable material 4 and the heat-sealing layer of the bag body.

FIGS. 3 and 4 are cross-sectional views of the heat-sealing portion shown in FIGS. 1 and 2. As shown in the figure, the tape-shaped easily peelable material 4 is inserted between the laminates 5 of the bag body by heat fusion. When it is desired to avoid contact between the easily peelable layer 43 and the contents, the inner edge of the bag may be melted and solidified in advance and the easily peelable layer 43 may be covered with the heat-adhesive layer 42. It has been determined that this coating cannot interfere with the automatic opening described below.

FIG. 5 shows the structure of the tape-shaped easy-to-peel material 4, and layers 41 and 42 for heat fusion with the laminate 5 of the bag body are laminated by an easily-peelable adhesive layer 43. . The base materials 411 and 421 of the layers 41 and 42 are preferably made of polyester, nylon (trade name), polypropylene, polyethylene, or the like, and may be a simple substance or a composite thereof. As the heat-bonding layers 412 and 422, resins that can be heat-sealed to the heat-sealing layer of the bag body, for example, polyolefins such as polyethylene and polypropylene, ethylene-vinyl acetate copolymers, ionomers, polyacrylonitrile, polyesters, polyamides and the like are used. Used. In addition, if the base materials 411 and 421 have a heat-sealing property with the laminated body 5 of the bag body, the thermal adhesive layers 412 and 422 can be omitted. Further, a printing layer, a coloring layer, or the like can be provided between the base materials 411 and 421 and the heat-bonding layers 412 and 422.

The easily peelable adhesive layer 43 comprises a resin layer 431 and an adhesive layer 432, and the resin layer 431 has relatively weak adhesive strength, such as vinyl resin, urethane resin, acrylic resin, polyamide resin, silicone resin, etc. Of the resin, which is formed by part coat of this resin. An example of the pattern is shown in FIG.
As shown in (a), (b), and (c), the uncoated portion forms, for example, a dot-like, linear, or lattice-like pattern.

The pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 432 is not particularly limited, and acrylic type, rubber type, vinyl type, silicon type and the like can be used, but the removable type is preferable to the permanent adhesive type. . Further, considering the removability of contents, resealing property, and impact resistance of the bag, it is more preferable that the holding force is strong and the adhesive force and tack are not so strong.

FIG. 7 shows the structure of the laminated body 5 forming the bag body in FIGS. 3 and 4, which is composed of a laminated body of a base material 51 and a heat sealing layer 52. The base material 51 is a laminate of a surface protective layer 511, a gas barrier layer 512, and a reinforcing layer 513, and a printing layer and a coloring layer can be appropriately provided. Also, depending on the application, it is not limited to this,
For example, there may be a configuration without the gas barrier layer 512 or a configuration without the reinforcing layer 513. Further, the positions of layers 512 and 513 may be interchanged. As the heat-sealing layer 52, polyolefin, ionomer, polyacrylonitrile, ethylene-vinyl acetate copolymer and the like are used, but the heat-sealing layer 52 is not limited to this, and the point is that the heat-bonding layer 412 of the tape-shaped interlayer easily peelable material 4 is used. 422 as long as it can be heat-sealed. It should be noted that the base material 51 is the thermal bonding layers 412, 42.
This layer 52 can be omitted if it has a heat fusion property with 2.

Next, as shown in FIGS. 3 and 4, the tape-shaped easily peelable material 4 is provided so as to project more into the bag body than the heat-sealing portion B. Further, as shown in FIG. 3, it may be provided outside the bag main body, and in that case, it is preferable to separate it into two pieces on the outside of the bag main body. The easily peelable material 4 protruding to the outside of the bag body serves as a tab for opening the bag, and the layers 41 and 42 are pinched with fingers.
If it is pulled to the left and right, the easily peelable adhesive layer 43 is broken and the bag can be easily opened. In FIG. 3, the easily peelable adhesive layer 43 is omitted in the knob portion separated into the layers 41 and 42. However, the resin layer 431 and the pressure-sensitive adhesive layer 432 are provided on the entire surface at that portion, and the It can also be peeled off to form the knob piece. Further, the protruding portion of the tape-shaped easy-to-peel material 4 protruding inside the bag is for ensuring the pressure resistance strength, the drop impact strength, and the heat sealing strength of the bag, and each stress is applied to the fused C portion. Since they are concentrated, the easily peelable adhesive layer 43 is not destroyed by the normal internal pressure. It is presumed that the adhesion of the protrusions prevents the layer 43 from breaking. However, it is possible to adjust the adhesive force of the layer 43 so as to be automatically opened by, for example, a rapid increase in internal pressure during cooking with a microwave oven. In that case,
As described above, it is not necessary to project the easily peelable material 4 outside the bag, but rather it is preferable not to project it in order to prevent erroneous opening.
At this time, it is preferable that the protruding length into the bag is about 1 to 30 mm.

Although the above embodiments have been described focusing on the packaging bag, of course, the self-standing bag 1a as shown in FIG. 8 is also included, and in addition to the bag, a flexible bottle or the like obtained by the blow molding method can be used. This invention can also be applied. In this case as well, the tape-shaped inter-layer easily peelable material may be interposed at the planned opening portion for heat sealing.

As the food to be stored in such an easy-open package, solid foods such as snacks and candy can be considered as foods. In addition, for medicines, patches such as anti-inflammatory and analgesic (Hap), for photosensitive materials, X-ray films and printing films, for electronic parts, integrated packaging of semiconductors such as IC and LSI (magazines, trays, embossed carrier tapes)
And so on.

Next, an experimental example of the easy-open bag of the present invention will be described.

Experimental Example 1 A flat bag as shown in FIGS. 1 and 3 was manufactured. The structure of the tape-shaped easily peelable material 4 (see FIG. 5) is a layer 411, a layer 421 is a 12 μm thick polyester film, layers 412 and 422 are a 30 μm thick polyacrylonitrile film, and a layer 431 is an acrylic resin. A pattern coat was applied with the pattern of (C). Layer 43
For No. 2, an acrylic removable adhesive was used. The structure of the laminated body 5 of the bag body (see FIG. 7) is that the layer 511 is a 12 μm thick polyester film and the layer 512 is 52.3 g / m ²
Fine paper, layer 513 is aluminum foil with a thickness of 7 μm, layer 52
Is a 30 μ thick polyacrylonitrile film, and layer 5
A two-component curing type urethane dry laminate adhesive was used between the layers 13 and 52, and the other layers were laminated by a polyethylene extrusion method.

The above-mentioned bag is filled and sealed with a haptic sheet,
According to JIS-Z0238 "Testing method for sealed flexible packaging bag", the drop strength and the compression strength were tested, but all passed.

Further, the unsealing property is also very good, and the resealing after taking out a part of the haptic agent sheet from the bag,
It was possible to reseal by simply overlapping and pressing the tape-shaped easily peelable material layer, and even a person with a fingertip who had difficulty resealing with a plastic chuck could easily reseal.

Experimental Example 2 A self-standing bag as shown in FIGS. 2 and 4 was manufactured. The structure of the tape-shaped easily peelable material 4 (see FIG. 5) is that the layers 411 and 421 are 25 μm thick polyester films, the layers 412 and 422 are 60 μm thick unstretched polypropylene films, and the layer 431 is acrylic resin. Part coat was applied with the pattern of b). Layer 432
Used an acrylic removable adhesive. The structure of the laminated body 5 of the bag body (see FIG. 7) was a layer 511 of 25 μm thick polyester film and a layer 52 of 60 μm thick unstretched polypropylene film, which were laminated using a two-component curing type urethane dry laminate adhesive. .

The bag is filled with water and sealed, and then JIS-Z is used.
[0238] Drop strength and compression strength were tested by "Test method for sealed flexible packaging bag". It was also heated in the microwave. The results are shown in Fig. 9. Regarding the spontaneous opening property, those with a protrusion length of 30 mm or less were very good.

[0028]

[Effect] As described above, the easily-openable bag of the present invention has the tape-shaped inter-layer easily peelable material inserted into the heat-sealed portion of the bag body by heat fusion, and the easily-peeled layer of this tape-shaped material is peeled off. Since the peeling strength is stable, it can be opened very easily and without failure by increasing the internal pressure during hand or cooking. Further, since this tape-like material is projected to the inside of the bag rather than the heat-sealing portion with the bag, it is excellent in pressure resistance, drop impact strength and heat-sealing strength as a bag.

Furthermore, since the layers of the tape-shaped easy-to-peel material are composed of a pressure-sensitive adhesive layer and a partial resin layer having weaker adhesive strength than that, resealing after opening is possible.

That is, the easy-open bag of the present invention has sufficient strength as a bag, easy-open property without failure, and easy re-sealing property, and is very convenient to handle and cost effective. Also has a high advantage.

[Brief description of drawings]

FIG. 1 is a front view showing a bag of the present invention.

FIG. 2 is a front view showing another example of the bag of the present invention.

FIG. 3 is a cross-sectional view of the heat-sealing portion of the bag.

FIG. 4 is a cross-sectional view showing another example of the above.

FIG. 5 is a cross-sectional view of a tape-shaped easy-to-peel material.

FIG. 6 is a plan view showing a coating pattern of a resin layer having weak adhesive strength in the same as above.

FIG. 7 is a cross-sectional view of the base material of the bag body.

FIG. 8 is a perspective view showing an example of a self-standing bag.

FIG. 9 is a table showing the results of experimental examples.

[Explanation of symbols]

 1, 1a Packaging bag 2, 2a Heat-sealing part 4 Tape-like easy peeling material 43 Easy peeling layer 431 Resin layer with relatively weak adhesive strength 432 Adhesive layer

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[Procedure amendment]

[Submission date] April 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

Next, as shown in FIGS. 3 and 4, the tape-shaped easily peelable material 4 is provided so as to project more into the bag body than the heat-sealing portion B. Further, as shown in FIG. 3, it may be provided outside the bag main body, and in that case, it is preferable to separate it into two pieces on the outside of the bag main body. The easily peelable material 4 protruding to the outside of the bag body serves as a tab for opening the bag, and the layers 41 and 42 are pinched with fingers.
If it is pulled to the left and right, the easily peelable adhesive layer 43 is broken and the bag can be easily opened. In FIG. 3, the easily peelable adhesive layer 43 is omitted in the knob portion separated into the layers 41 and 42. However, the resin layer 431 and the pressure-sensitive adhesive layer 432 are provided on the entire surface at that portion, and the It can also be peeled off to form the knob piece. Length of two protruding tabs
Need not be the same
It is also possible to shift them relative to each other. And layer 41
And 42 are laminated and integrated with the laminated bodies 5 and 5 behind, respectively.
If you leave it open, the picking piece will become thicker and easier to pick
Easy to seal. Further, the protruding portion of the tape-shaped easy-to-peel material 4 protruding inside the bag is for ensuring the pressure resistance strength, the drop impact strength, and the heat sealing strength of the bag, and each stress is applied to the fused C portion. Since they are concentrated, the easily peelable adhesive layer 43 is not destroyed by the normal internal pressure. It is presumed that the adhesion of the protrusions prevents the layer 43 from breaking. However, it is possible to adjust the adhesive force of the layer 43 so as to be automatically opened by, for example, a rapid increase in internal pressure during cooking with a microwave oven. In that case, it is not necessary to project the easily peelable material 4 to the outside of the bag as shown in FIG. 4, and rather it is preferable not to project it in order to prevent erroneous opening. In addition,
At this time, the length of protrusion into the bag is preferably about 1 to 30 mm.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

Experimental Example 2 A self-standing bag as shown in FIGS. 2 and 4 was manufactured. The structure of the tape-shaped easily peelable material 4 (see FIG. 5) is that the layers 411 and 421 are 25 μm thick polyester films, the layers 412 and 422 are 60 μm thick unstretched polypropylene films, and the layer 431 is acrylic resin. Part coat was applied with the pattern of b). Layer 432
Used an acrylic removable adhesive. The structure of the laminated body 5 of the bag body (see FIG. 7) is that the layer 511 is a 25 μ thick polyester film and the layer 512 is a 7 μ thick aluminum film.
Foil, layer 513 is a 15μ thick nylon film, layer 52
Is a 60 μ thick unstretched polypropylene film, 2
A liquid-curable urethane dry laminate adhesive was used for lamination.

Claims (2)

[Claims] 1. A high-tightness packaging bag formed by heat-sealing, wherein a tape-shaped inter-layer easily peelable material is present at least in a scheduled heat-sealing portion, and the tape-shaped inter-layer easily peelable material is the outermost layer. Has a heat-sealing layer of the bag body and a heat-bonding layer capable of heat-sealing, and the inner layer has a single easily peelable layer consisting of an adhesive layer and a partial resin layer having a weaker adhesive strength than that. A packaging bag characterized by being. 2. The packaging bag according to claim 1, wherein the tape-shaped easy-to-peel material is protruded inside the bag body rather than the heat-sealed portion of the bag body.