JP3634451B2 - Easy-open bag - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an easy-open bag that can be easily opened while being able to form an opening of any size in the bag.
[0002]
[Prior art]
Conventionally, regarding a plastic bag which has been easily opened using a tape for opening, for example, a band-shaped tearing device having two cuts as described in Japanese Utility Model Publication No. 62-29418 A configuration in which a film is bonded to the inner surface of a bag at an opening position is known. However, in the case of using a slit in the tearing film as in the case of the above bag, there is a drawback that it is difficult to form the cut in the film, the workability is poor, and the result is expensive. Further, as a bag that can be heated in a microwave oven, a bag in which a part of the bag is made of a breathable material, a hole formed in the bag, and the hole is peeled and sealed with a tape or the like are known. In both cases, the manufacturing process of the bag is complicated and expensive, and the former has a disadvantage that the barrier property is inferior because it partially uses a breathable material, and it is not easy to open. At the time, there was a drawback that it was difficult to open.
[0003]
[Problems to be solved by the invention]
It is an object of the present invention to easily open a bag and to easily form an opening for releasing steam generated when heating in a microwave oven. For example, the contents can be packaged by a pillow type packaging machine or the like. It is to provide an easy-open bag that can be easily processed in-line.
[0004]
[Means for Solving the Problems]
A laminated body having an inner surface made of a heat-adhesive resin layer, with the heat-adhesive resin layer as an inner surface, and an edge heat-bonding portion at both upper and lower or left and right edges and an orthogonal heat-bonding portion orthogonal to the edge heat-bonding portion. shall apply in formed pouch with tear tape is adhered to the cotton the length between both end edges heat seal portion connexion the heat adhesive resin layer surface of the bag, in the edge thermal bonding of the opposite end edges, Cuts extending from the edge are formed in the laminate on both sides of the edge of the opening tape, and an opening is formed with the edge of the opening tape and the region including the cut as a non-thermally bonded part. It is an easy-open bag characterized by comprising.
[0005]
It is a pillow type bag formed so that the orthogonal thermal bonding portion is located at the center of the bag.
[0006]
The opening tape has a structure in which a heat-adhesive resin layer is laminated on both surfaces of a uniaxially stretched film or a biaxially stretched film, and at least one of the heat-adhesive resin layers is made of an easily peelable heat-adhesive resin. The easy-open bag described above.
[0007]
[Action]
The inner surface is a laminate composed of a heat-adhesive resin layer, with the heat-adhesive resin layer as the inner surface, and is formed by edge heat-bonded portions at the upper and lower or left and right end edges and orthogonal heat-bonded portions orthogonal to the edge heat-bonded portions. The opening tape is bonded to the heat-adhesive resin layer surface over the entire length between the edge thermal bonding portions of the bag, and at least one of the edge thermal bonding portions of the opening tape. In the opening portion, a structure is formed in which an opening is formed in the laminated body on both sides of the end edge and the end edge of the opening tape and the region including the incision is a non-thermally bonded portion. An opening of any size can be formed in the bag by easily peeling it off from the portion where the edge of the opening tape is cut, so that it can be heated in that state in a microwave oven. The contents can be opened easily after opening the bag after heating It can be taken out. Also, when packaging the contents with a pillow type automatic packaging machine, etc., inline bonding of the opening tape, formation of cuts on both sides of the edge of the opening tape, formation of a non-thermal bonding part, etc. Since the processing can be easily performed, it can be manufactured at a low price without requiring a special process.
[0008]
【Example】
Hereinafter, the present invention will be described with reference to the drawings.
1A and 1B are diagrams showing an easy-open bag of the present invention, where FIG. 1A is a plan view, FIG. 1B is a sectional view taken along line II in FIG. 1A, and FIG. 1C is a sectional view taken along line II-II in FIG. 2 is a cross-sectional view showing the laminated structure of the opening tape, FIG. 3 is a view showing a state in which the easy-open bag of the present invention is torn by the opening tape to form an opening, (A) is a plan view, (B) is FIG. 4 is a plan view showing a laminated film in a continuous state used for producing the easy-open bag of the present invention, wherein 1 is an orthogonal thermal bonding portion and 2 is an edge. Thermal bonding part, 3 is an opening tape, 3a is a tape substrate, 3b is an easily peelable resin layer, 4 is a cut, 5 is a non-thermal bonding part, 6 is an opening part, 7 is a laminate, 8 is an opening, 9 represents a cut line, 11 represents an orthogonal thermal bonding region, 12 represents an edge thermal bonding region, and 15 represents a non-thermal bonding region.
[0009]
The easy-open bag of the present invention is as shown in FIG. 1, and as shown in FIG. 1 (a), the planar shape is formed by laminating a laminate 7 having a heat-adhesive resin layer on the inner surface between the orthogonal heat-bonding portion 1 and both ends. A pillow-type bag formed by the edge thermal bonding portion 2, and the opening tape 3 is placed on the surface of the thermal adhesive resin layer over the entire length between the edge thermal bonding portions 2 of the bag in parallel with the orthogonal thermal bonding portion 1. While being thermally bonded, an opening 6 is formed on both edges of the opening tape 3. The structure of the opening portion 6 is such that a cut 4 having a predetermined length is formed in the laminate on both sides of the opening tape 3 at both ends of the opening tape 3, and the edge and the cut 4 of the opening tape 3 are formed. The region including the non-thermal bonding portion 5 is used.
[0010]
As shown in FIG. 1 (b), the opening 6 has a cross-sectional shape in which a cut 4 having a predetermined length is formed in the laminated body on both sides of the opening tape 3 at both ends of the opening tape 3 and the opening is opened. Since the region including the edge of the tape 3 and the cut 4 is a non-thermally bonded portion 5 that is not thermally bonded, the laminate 7 in which the edge of the opening tape 3 and the opening tape 3 are bonded is picked and cut. The bag can be torn along the insert 4. Moreover, the cross-sectional shape of the edge thermal bonding part 2 adjacent to the opening part 6 is heat-bonded in a state where the opening tape 3 is sandwiched between the heat-adhesive resin layers of the laminate 7 as shown in FIG. ing. Moreover, the laminated structure of the opening tape 3 is a structure in which an easily peelable resin layer 3b is laminated on both surfaces of the tape substrate 3a as shown in FIG. The opening tape 3 is thermally bonded in a state of being sandwiched between the heat-adhesive resin layer surfaces of the laminate 7 constituting the bag. In addition, it is good also as a structure which laminated | stacked the easily peelable resin layer 3b on the one surface of the tape base material 3a, and laminated | stacked the thermobonding resin layer on the other surface for the laminated structure of the tape 3 for opening. In that case, the opening tape 3 is bonded to the heat-adhesive resin layer surface of the laminate 7 constituting the bag by the heat-adhesive resin layer of the opening tape 3.
[0011]
In the easy-opening bag of the present invention, the bonding position of the opening tape 3 may be either the center of the bag or a position near the edge as long as it is attached over the entire length between the edge thermal bonding portions 2 of the bag. is there. Also, the surface of the bag to which the opening tape 3 is bonded is attached to the heat-adhesive resin layer of the laminated body on the side facing the side where the orthogonal heat-bonding portion 1 is formed in the above embodiment. You may attach to the surface of the bag in which the orthogonal heat bonding part 1 is formed. Moreover, although the opening part 6 is formed in the both ends of a bag, you may form the opening part 6 only in one edge of a bag. The opening portions 6 are formed at both ends of the bag as in the above embodiment, as will be described later, when the contents are automatically packaged by a pillow type automatic packaging machine or the like, the opening portions 6 are formed in-line. This is because the workability is better when the opening portions 6 are formed at both ends of the bag.
[0012]
The easy-open bag of the present invention can form an opening 9 in the bag as shown in FIG. 3 (a) by picking the end of the opening tape 3 in the opening 6 and tearing the bag to a certain position. Therefore, heating in the microwave oven is possible in that state. In the edge thermal bonding part 2 adjacent to the opening part 6, the surface to be peeled is an interface between the easily peelable resin layer 3b of the opening tape 3 and the heat adhesive resin layer on the inner surface of the bag. Since the thermal adhesive strength between the easily peelable resin layer 3b and the thermal adhesive resin layer on the inner surface of the bag can be easily peeled off, it can be opened by picking and pulling the edge of the opening tape 3. Thus, the interface between the easily peelable resin layer 3b of the tape 3 and the heat-adhesive resin layer on the inner surface of the bag is peeled off, and the bag can be easily torn. When the opening tape 3 is torn, a part of the laminate 7 is torn and removed, as shown in FIG. As shown in FIG. 3 (a), the opening tape 3 can be heated with a microwave oven while the opening 9 is formed in the tear bag by grasping the edge of the opening tape 3, and the opening tape 3 is completely removed after the heating is completed. The contents can be taken out by tearing and opening the bag. Moreover, when using it as it is, without heating with a microwave oven, the contents can be taken out easily by tearing a bag completely with the tape 3 for opening.
[0013]
The easy-open bag of the present invention is manufactured by adhering the opening tape 3 to the laminate 7 to form the notch 4 at a predetermined location, and preparing a laminate having the structure shown in FIG. It can be used and packaged by a pillow type packaging machine or the like. However, adhesion of the unsealing tape 3 to the laminate 7 and formation of the cuts 4 are processing in separate steps, increasing the number of processing steps, and opening the processed laminate 7 in a roll shape. Since the portion where the tape 3 is bonded is raised, it becomes difficult to wind up. Therefore, it is preferable to manufacture the easy-open bag of the present invention by a method of producing inline when the contents are automatically packaged by a pillow type packaging machine or the like. In order to produce the easy-open bag of the present invention by forming the opening portion 6 with a pillow type packaging machine or the like, first, a laminate 7 is produced by printing on the base material layer and laminating the heat-adhesive resin layer. Slitting to a predetermined width to form a roll. The roll-shaped laminate 7 is supplied to a pillow type packaging machine, the laminate 7 is fed out, and continuously or intermittently transferred to the thermoadhesive resin layer surface at a predetermined position in the width direction of the laminate 7. After sticking the opening tape 3 in a state by thermal bonding, a notch 4 having a predetermined length is formed on both sides of the opening tape 3 at a position straddling the cut wire 9 to be cut into individual bags after packaging. Then, it is processed into the state shown in FIG.
[0014]
Next, in the orthogonal thermal bonding regions 11 on both sides, the thermal adhesive resin layer surfaces of the laminate 7 are put together and thermally bonded to form the orthogonal thermal bonding portion 1 to form a cylinder, and at the same time, the contents are put in the inside Store. After forming the edge heat bonding portion 2 by heat bonding at the edge heat bonding region 12 in a state where the contents are stored in the tube, the cut at the center of the edge heat bonding region 12 is performed. By cutting with the line 9, the easy-open bag of the present invention in which the contents are packaged is produced. When the edge thermal bonding part 2 is formed by thermal bonding in the edge thermal bonding area 12, the non-thermal bonding area 15 including the cuts 4 on both sides of the opening tape 3 at the position straddling the cutting wire 9 is left. Then, the unsealed portion 6 can be formed by thermally bonding to form the non-thermally bonded portion 5. Since the non-thermal bonding region 15 is provided symmetrically with the cut line 9, the opening portions 6 are formed at both ends of the opening tape 3 of the easy-open bag in a state where packaging is completed.
[0015]
The laminate 7 has a configuration in which a heat-adhesive resin layer is laminated on a base material layer. As the base material layer constituting the laminate 7, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (PET), 2 Films such as axially stretched nylon (ON) can be used, and unstretched polypropylene (CPP), polyethylene (PE), aluminum-deposited unstretched polypropylene (VMMCPP), aluminum-deposited polyethylene (VMPE), etc. are used as the thermal adhesive resin layer it can. As a specific laminated structure, a laminated body such as OPP / CPP, PET / CPP, OPP / VMPP, PET / VMCP, ON / PE is most commonly used. In the case of use for heating in a microwave oven, an aluminum vapor deposition film cannot be used. The barrier property of the bag can be improved by using an aluminum vapor deposition film.
[0016]
The structure of the opening tape 3 may be the structure shown in FIG. 2 in which the easily peelable resin layer 3b is laminated on both surfaces of the tape substrate 3a, or the easily peelable resin layer on one surface of the tape substrate 3a. It is good also as a structure which laminated | stacked the heat-adhesive resin layer on the other surface 3b. As the tape base material 3a of the opening tape 3, uniaxially stretched or biaxially stretched polypropylene, biaxially stretched polyethylene terephthalate, or the like can be suitably used. Since the tape base material 3a plays the role of tearing the laminate, it needs strength, and preferably has a thickness of 25 to 40 microns. The easily peelable resin layer 3b preferably has a strength of about 0.5 to 1.5 kg / 15 mm when thermally bonded to the heat-adhesive resin layer constituting the inner surface of the laminate 7. For example, an easily peelable resin such as CMPS manufactured by Tosero can be used.
[0017]
The easy-open bag of the present invention is most suitable for packaging frozen foods, snack foods, and the like. When used for packaging frozen food, the opening tape 3 can be torn to a length corresponding to the heating suitability of the contents to form the opening 8 and heated as it is in a microwave oven. In addition, when used for packaging snack foods, it is possible to obtain a package with excellent gas barrier properties by using a laminate in which an aluminum vapor-deposited film is laminated, and the bag can be easily opened at the time of use. it can.
[0018]
【The invention's effect】
A bag formed by heat bonding with a laminated body having an inner surface made of a heat-adhesive resin layer as the inner surface of the heat-adhesive resin layer, and the entire length between the edge heat-bonded portions formed at opposite ends of the bag In addition, the opening tape is bonded to the surface of the heat-adhesive resin layer, and at least one edge of the opening tape is formed with a cut in the laminate on both sides of the opening tape, and at least one of the aforementioned In the edge thermal bonding portion, an opening is formed in which a cut is formed in the laminate on both sides of the edge of the opening tape, and the region including the edge and the cutting of the opening tape is a non-thermal bonding portion. Since it is an easy-open bag with a formed configuration, an opening of an arbitrary size can be formed in the bag by tearing the bag by pulling the opening tape from the opening portion, so that the bag is opened. It can be heated in a microwave oven in the bag. In use, the bag can be opened by tearing the bag with an opening tape, and the contents can be easily taken out. The easy-open bag that can be heated in a microwave oven according to the present invention flows in the laminated body at a predetermined position in the width direction of the laminated body constituting the bag, for example, in-line when automatically packaging with a pillow type automatic packaging machine or the like. Since the opening tape is bonded over the entire length in the direction and cuts are made at predetermined intervals and packaging can be performed at high speed by thermal bonding, an easy-open bag can be produced at low cost.
[Brief description of the drawings]
FIG. 1 is a view showing an easy-open bag of the present invention, in which (A) is a plan view, (B) is a sectional view taken along line II in (A), and (C) is a sectional view taken along line II-II in (A).
FIG. 2 is a cross-sectional view showing a laminated structure of an opening tape.
FIGS. 3A and 3B are diagrams showing a state in which an easy-open bag of the present invention is torn by an opening tape to form an opening, where FIG. 3A is a plan view, and FIG. 3B is a cross-sectional view taken along line II in FIG.
FIG. 4 is a plan view showing a laminated film in a continuous state used for producing the easy-open bag of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Central heat-bonding part 2 Edge heat-bonding part 3 Opening tape 3a Tape base material 3b Easy peelable resin layer 4 Cutting 5 Non-thermal-bonding part 6 Opening part 7 Laminated body 8 Opening 9 Cut wire 11 Central heat-bonding area | region 12 Edge thermal bonding region 15 Non-thermal bonding region

Claims (3)

A laminated body having an inner surface made of a heat-adhesive resin layer, with the heat-adhesive resin layer as the inner surface, and an edge heat-bonding portion at both upper and lower or left and right edges and an orthogonal heat-bonding portion orthogonal to the edge heat-bonding portion. shall apply in formed pouch with tear tape is adhered to the cotton the length between both end edges heat seal portion connexion the heat adhesive resin layer surface of the bag, in the edge thermal bonding of the opposite end edges, Cuts extending from the edge are formed in the laminate on both sides of the edge of the opening tape, and an opening part is formed with the edge of the opening tape and the region including the notch as a non-thermal adhesive part. An easy-open bag characterized by comprising. The easy-open bag according to claim 1, wherein the bag is a pillow type bag formed so that the orthogonal thermal bonding portion is positioned at a central portion of the bag. The opening tape has a structure in which a heat-adhesive resin layer is laminated on both sides of a uniaxially stretched film or a biaxially stretched film, and at least one of the heat-adhesive resin layers is made of an easily peelable heat-adhesive resin. The easy-open bag according to claim 1, wherein

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