JPH0930537A - Easy-open bag - Google Patents

Abstract

(57) [Abstract] [Purpose] When packaging contents in a pillow type packaging machine, etc., which can easily form an opening for letting out steam generated when heating in a microwave oven and can easily open a bag. It is to provide a low-priced easy-open bag that can be processed in-line. [Structure] A bag having an inner surface made of a heat-adhesive resin layer,
The unsealing tape is adhered to the surface of the heat-adhesive resin layer over the entire length between the edge heat-bonded portions of the bag, and at least one edge of the unsealing tape has a notch and a non-heat-bonded portion. It is an easy-open bag having a structure formed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily openable bag which can be formed with an opening of any size and which can be easily opened.

[0002]

2. Description of the Related Art Conventionally, regarding a plastic bag which is easily opened by using an opening tape, for example, two cuts are formed as described in Japanese Utility Model Publication No. 62-29418. It is known that a certain strip-shaped film for tearing is adhered to the inner surface of the bag at the opening position.
However, when a slit is formed in the slitting film as in the above-mentioned bag and used, the work of forming the slit in the film is difficult and the workability is poor, resulting in a high cost. Further, as a bag that can be heated in a microwave oven, there are known a bag in which a part of the bag is made of a breathable material, a bag in which a hole is formed and the hole is peelably sealed with tape or the like. , Both of them have complicated bag manufacturing process and are expensive, and the former one has the drawback that the barrier property is inferior because it partially uses the breathable material, and it is not easy to open. At that time, there was a drawback that it was difficult to open.

[0003]

DISCLOSURE OF THE INVENTION An object of the present invention is to easily open a bag and to easily form an opening for letting out steam generated when it is heated in a microwave oven. An object of the present invention is to provide an easy-open bag that can be easily processed inline when packaging the contents with a packaging machine or the like.

[0004]

[MEANS FOR SOLVING THE PROBLEMS] A laminate having an inner surface made of a heat-adhesive resin layer, with the heat-adhesive resin layer as an inner surface, is provided with edge heat-bonded portions at upper and lower edges or left and right edges and the edge heat-bonded portions. In the bag formed by the orthogonal heat-bonding portion orthogonal to the part, the unsealing tape is bonded to the heat-bondable resin layer surface over the entire length between the both-end edge heat-bonded portions of the bag, and at least one In the edge heat-bonding portion of (1), notches are formed in the laminate on both sides of the edge of the tape for unsealing, and a region including the edge of the tape for opening and the notch is used as a non-heat-bonding portion. It is an easy-open bag, characterized in that it has a configuration in which a portion is formed.

The above-mentioned easy-open bag is characterized in that it is a pillow type bag formed so that the orthogonal heat-bonding portion is located at the center of the bag.

In the opening tape, a heat-adhesive resin layer is laminated on both surfaces of a uniaxially stretched film or a biaxially stretched film, and at least one heat-adhesive resin layer is made of an easily peelable heat-adhesive resin. The above-mentioned easy-open bag is characterized in that it has a configuration.

[0007]

The laminated body having an inner surface made of a heat-adhesive resin layer has the heat-adhesive resin layer as an inner surface, and the edge heat-bonded portions at the upper and lower ends or the left and right edges and the orthogonal heat-bonded portions orthogonal to the edge heat-bonded portions. In the bag formed by, the unsealing tape is adhered to the heat-adhesive resin layer surface over the entire length between the edge heat-bonded portions of the bag, and the unsealing tape is formed in at least one of the edge heat-bonded portions. By forming a notch in the laminated body on both sides of the edge of the tape for use and forming an opening part having a non-heat-bonded portion in the region including the edge and the notch of the opening tape, Since the opening of the opening tape in the opening section can be easily peeled off from the portion where the notch is formed to form an opening of any size in the bag, it can be heated in a microwave oven in that state. Besides, it is possible to open the bag easily after heating It is possible to take out the contents.
In addition, when packaging the contents with a pillow type automatic packaging machine etc., inline adhesion of the opening tape, formation of cuts on both sides of the edge of the opening tape, formation of non-heat-bonded parts, etc. Since the processing can be performed easily, it can be manufactured at a low price without requiring a special process.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a view showing an easy-open bag of the present invention, (a) is a plan view,
(B) is a cross-sectional view taken along the line I-I in (A), and (C) is (A).
II-II cross-sectional view in FIG. 2, FIG. 2 is a cross-sectional view showing the laminated structure of the opening tape, and FIG. 3 is a view showing a state in which the easy-open bag of the present invention is torn to form an opening by the opening tape.
(A) is a plan view, (B) is a sectional view taken along the line I-I in (A), and 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. 1 is an orthogonal thermal bonding part, 2 is an edge thermal bonding part, 3 is a tape for opening, 3a is a tape base material, 3b is an easily peelable resin layer, 4 is a notch, 5 is a non-thermal bonding part, and 6 is an opening. A part, 7 is a laminated body, 8 is an opening, 9 is a cutting line, 11 is an orthogonal thermal bonding region, 12 is an edge thermal bonding region, and 15 is a non-thermal bonding region.

The easy-open bag of the present invention is as shown in FIG. 1, and the plane shape thereof is, as shown in FIG. 1 (a), a laminated body 7 having a heat-adhesive resin layer on the inner surface thereof, and the orthogonal heat-adhesive part 1 A pillow-type bag formed by the edge heat-bonding portions 2 at both ends, wherein the opening tape 3 is heat-bondable in parallel with the orthogonal heat-bonding portion 1 over the entire length between the edge heat-bonding portions 2 of the bag. The opening portion 6 is formed on both edges of the opening tape 3 while being heat-bonded to the resin layer surface. The structure of the unsealing portion 6 is such that notches 4 of a predetermined length are formed in the laminate on both sides of the unsealing tape 3 at both edges of the unsealing tape 3, and the rim 4 and the notches 4 of the unsealing tape 3 are formed. The non-heat-bonding portion 5 is formed in a region including the.

As shown in FIG. 1B, the cross-sectional shape of the unsealing portion 6 is such that notches 4 having a predetermined length are formed in the laminated body on both sides of the unsealing tape 3 at both edges of the unsealing tape 3. Moreover, since the edge of the opening tape 3 and the region including the notch 4 form the non-heat-bonded portion 5 which is not heat-bonded, the laminated body 7 in which the edge of the opening tape 3 and the opening tape 3 are bonded is formed. The bag can be torn along the notch 4 to tear it. In addition, as shown in FIG. 1C, the cross-sectional shape of the edge heat-bonding portion 2 adjacent to the unsealing portion 6 is heat-bonded with the unsealing tape 3 sandwiched between the heat-adhesive resin layers of the laminate 7. ing. In addition, the laminated structure of the unsealing tape 3 is, as shown in FIG.
The peelable resin layer 3b is laminated on both surfaces of the. The unsealing tape 3 is heat-bonded while being sandwiched between the heat-adhesive resin layer surfaces of the laminated body 7 forming the bag. The opening tape 3 may be laminated so that the easily peelable resin layer 3b is laminated on one surface of the tape substrate 3a and the heat-adhesive resin layer is laminated on the other surface. In that case, opening tape 3
Is adhered to the heat-adhesive resin layer surface of the laminated body 7 forming the bag by the heat-adhesive resin layer of the unsealing tape 3.

In the easy-open bag of the present invention, the opening tape 3 may be adhered at the center of the bag or at a position near the edge as long as it is attached over the entire length between the edge heat-bonding portions 2 of the bag. Well optional. Further, the surface of the bag to which the unsealing tape 3 is adhered is also attached to the thermoadhesive resin layer of the laminated body on the side opposite to the side on which the orthogonal thermal adhesive section 1 is formed in the above embodiment, You may attach to the surface of the bag in which the orthogonal thermal-bonding part 1 is formed. Further, although the opening portion 6 is formed on both ends of the bag, the opening portion 6 may be formed on only one edge of the 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 wrapped by a pillow type automatic packaging machine or the like, the opening portions 6 are inline. This is because the workability is better when the opening portions 6 are formed at both ends of the bag for forming.

In the easy-open bag of the present invention, an opening 9 is formed in the bag as shown in FIG. 3A by pinching the end portion of the unsealing tape 3 in the unsealing portion 6 and tearing the bag to a certain position. Therefore, heating in a microwave oven is possible in that state. In the edge heat-bonding portion 2 adjacent to the unsealing portion 6, the surface to be peeled is the easily peelable resin layer of the unsealing tape 3.
It is the interface between 3b and the heat-adhesive resin layer on the inner surface of the bag. Since the heat-bonding strength between the easily peelable resin layer 3b and the heat-bonding resin layer on the inner surface of the bag is such that it can be easily peeled off, by grasping and pulling the edge of the unsealing tape 3, 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 so that the bag can be easily torn. When the unsealing 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 in a microwave oven in a state where the opening 9 is formed by pinching the edge of the opening tape 3, and after the heating is completed, the opening tape 3 is completely removed. The contents can be taken out by tearing and opening the bag. When the bag is used as it is without being heated in a microwave oven, the contents can be easily taken out by completely tearing the bag with the opening tape 3.

To manufacture the easy-open bag of the present invention, the opening tape 3 is adhered to the laminate 7 to form the notch 4 at a predetermined position,
A laminate having the structure shown in FIG. 4 can be prepared in advance and used for packaging with a pillow type packaging machine or the like. However, the adhesion of the unsealing tape 3 to the laminate 7 and the formation of the notches 4 become a separate process, which increases the number of processing steps and, in addition, when the processed laminate 7 is wound into a roll, it is opened. Since the portion where the tape 3 is adhered rises, it becomes difficult to wind it. Therefore, the easy-open bag of the present invention,
It is preferable to manufacture by an in-line manufacturing method when the contents are automatically packed in a pillow type packing machine or the like. In order to manufacture the easy-open bag of the present invention by forming the opening part 6 with a pillow type packing machine or the like, first, the base material layer is printed and the heat-adhesive resin layer is laminated to prepare the laminate 7. Slit to a predetermined width to make a roll. The roll-shaped laminated body 7 is fed to a pillow type packaging machine, and the laminated body 7 is fed out and continuously or intermittently transferred to the heat-adhesive resin layer surface at a predetermined position in the width direction of the laminated body 7. After the unsealing tape 3 is attached by heat bonding in this state, a notch 4 of a predetermined length is formed on both sides of the unsealing tape 3 at a position across the cutting line 9 that cuts into individual bags after packaging. , The state shown in FIG.

Next, in the orthogonal heat-bonding regions 11 on both sides, the heat-bonding resin layer surfaces of the laminate 7 are put together and heat-bonded to form the cross-linking heat-bonding portion 1 into a tubular shape. Store it inside. After the heat-bonding is performed in the edge heat-bonding area 12 to form the edge heat-bonding portion 2 in a state in which the contents are accommodated inside the tubular shape, the cut at the center of the edge heat-bonding area 12 is formed. By cutting along the line 9, the easily openable bag of the present invention in which the contents are packaged is produced. When heat-bonding in the edge heat-bonding region 12 to form the edge heat-bonding portion 2,
The unsealing portion 6 can be formed by heat-bonding the non-thermally bonding areas 15 including the notches 4 on both sides of the unsealing tape 3 at the position crossing the cutting line 9 to form the non-thermally bonding portion 5. Since the non-heat-bonding region 15 is provided symmetrically with respect to the cutting line 9, the unsealing portions 6 are formed at both ends of the unsealing tape 3 of the easy-to-open bag in the completed packaging state.

The laminate 7 has a structure in which a thermoadhesive resin layer is laminated on a base material layer, and the base material layer constituting the laminate 7 is biaxially oriented polypropylene (OPP) or biaxially oriented polyethylene terephthalate (PET). ) Films such as biaxially stretched nylon (ON) can be used, and as the heat-adhesive resin layer, unstretched polypropylene (CPP), polyethylene (PE), aluminum deposited unstretched polypropylene (V
MCPP), aluminum vapor deposition polyethylene (VMP
E) and the like can be used. As a concrete laminated structure, OP
P / CPP, PET / CPP, OPP / VMCPP, P
Laminates such as ET / VMCPP, ON / PE are the most commonly used configurations. Aluminum vapor deposition film cannot be used for heating in a microwave oven.
The barrier property of the bag can be improved by using the aluminum vapor deposition film.

The unsealing tape 3 may have 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 may be easily peeled on one surface of the tape substrate 3a. The heat-resisting resin layer 3b may be laminated on the other surface with a heat-adhesive resin layer. As the tape base material 3a of the unsealing tape 3, uniaxially stretched or biaxially stretched polypropylene, biaxially stretched polyethylene terephthalate or the like can be preferably used. Since the tape base material 3a plays a role of tearing the laminate, it needs to have strength, and the thickness is preferably 25 to 40 μm. The easily peelable resin layer 3b has a strength of 0. 1 when heat-bonded to the heat-adhesive resin layer forming the inner surface of the laminate 7.
It is preferably about 5 to 1.5 kg / 15 mm. For example, an easily peelable resin such as CMPS manufactured by Tohcello can be used.

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 foods, 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. When used for packaging snack foods, a laminate having excellent gas barrier properties can be obtained by using a laminate in which aluminum vapor-deposited films are laminated, and the bag can be easily opened at the time of use. it can.

[0018]

EFFECTS OF THE INVENTION A bag formed by heat-bonding a laminated body having an inner surface made of a heat-adhesive resin layer with the heat-adhesive resin layer as an inner surface, wherein edge heats formed at opposite edges of the bag. An unsealing tape is adhered to the surface of the heat-adhesive resin layer over the entire length between the adhesive parts, and at least one edge of the unsealing tape is provided with notches in the laminate on both sides of the unsealing tape. In at least one of the edge heat-bonding portions, a cut is formed in the laminate on both sides of the edge of the opening tape, and a region including the edge of the opening tape and the cut is a non-heat-bonded portion. Since it is an easy-open bag having a configuration in which the opening section is formed, the opening tape can be pulled from the opening section to tear the bag and an opening of any size can be formed in the bag. With the bag formed, it can be heated in the microwave while still in the bag. That. Further, at the time of use, the bag can be opened by tearing the bag with the opening tape, and the contents can be easily taken out. Further, the microwave oven easy openable bag of the present invention, for example, in-line when automatically wrapped by a pillow type automatic packaging machine, the flow of the laminate at a predetermined position in the width direction of the laminate constituting the bag. Since it is possible to bond the unsealing tape over the entire length in the direction, and to make the notches at predetermined intervals and to perform the thermal bonding for high-speed packaging, it is possible to manufacture the easy-open bag at a low cost.

[Brief description of drawings]

FIG. 1 is a view showing an easy-open bag of the present invention, (a) is a plan view, (b) is a sectional view taken along the line I-I of (a), and (c) is a sectional view taken along the line II-II of (a).

FIG. 2 is a sectional view showing a laminated structure of the unsealing tape.

FIG. 3 is a diagram showing a state in which the easy-open bag of the present invention is torn by an opening tape to form an opening, and (a) is a plan view,
(B) is an II sectional view in (A).

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]

 1 Central heat-bonded part 2 Edge heat-bonded part 3 Opening tape 3a Tape base material 3b Easy peelable resin layer 4 Notch 5 Non-heat-bonded part 6 Opening part 7 Laminated body 8 Opening 9 Cut line 11 Central heat-bonded region 12 Edge heat-bonded area 15 Non-heat-bonded area

Claims (3)

[Claims] 1. A laminate having an inner surface made of a heat-adhesive resin layer, with the heat-adhesive resin layer as an inner surface, is perpendicular to the edge heat-bonded portions at the upper and lower edges or the left and right edges. A bag formed by orthogonal heat-bonding parts, wherein an unsealing tape is bonded to the heat-bondable resin layer surface over the entire length between the both-end edge heat-bonding parts of the bag, and at least one of the edges In the heat-bonding portion, cuts are formed in the laminated body on both sides of the edge of the opening tape, and an opening portion in which a region including the edge of the tape for opening and the cut is a non-heat-bonding portion is formed. An easy-opening bag characterized by having a different structure. 2. The easy-open bag according to claim 1, wherein the orthogonal heat-bonding portion is a pillow type bag formed so as to be located at a central portion of the bag. 3. The unsealing tape comprises a uniaxially stretched film or a biaxially stretched film having thermoadhesive resin layers laminated on both sides thereof, and at least one thermoadhesive resin layer is an easily peelable thermoadhesive resin. The easy-open bag according to claim 1, wherein the easy-open bag is characterized in that