JP2007091265A - Easily openable packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily openable packaging bag that is prevented from being bent along perforations, has no constraints on the direction of opening perforations, can be applied in the form of a three-sided sealed bag, four-sided sealed bag, pillow bag, gusset bag, self-supporting bag, etc. <P>SOLUTION: A rectangular laminate is formed from at least, in order from the surface layer, an easily tearable film layer and a base material layer, and keeps a heat-bondable resin layer overlying the innermost layer. The opposite edges of the rectangular laminate are heat bonded so that the innermost layers are superposed. Thus, a tubular body having a principal rafter is formed. At least the side edges of the tubular body are formed into projecting folds. The upper and lower open ends of the tubular body are sealed by heat bonding. Thus, the packaging bag is obtained. In such a packaging bag, the opening perforations are formed on the base material layers along a predetermined opening line the opening initiation end of which is located in one of the projecting folds. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a packaging bag made of a laminate in which an easy tear film is laminated on a surface layer, and relates to an easy-opening packaging bag in which a tear line for opening is formed along a planned opening line.

  Conventionally, as a bag that has been easily opened by providing a cut, the bag is made of a laminated body in which a surface base material layer, an intermediate layer, and a heat-adhesive resin layer are laminated via an adhesive layer, respectively. In addition, there is known an easy-open packaging bag in which a continuous straight cut is formed in the intermediate layer, and a notch is provided in at least one of the heat bonding portions of the bag at both ends of the cut (for example, Patent Document 1). reference).

The easy-open packaging bag has excellent openability because a continuous linear cut is formed, but on the other hand, the strength as a packaging bag is reduced, and the packaging bag is centered on a straight cut. There is a problem that it is easy to bend. In addition, since the direction of the linear cut line is parallel to the traveling direction of the laminated web, there are restrictions depending on the form of the packaging bag. For example, in the form of pillow packaging, gusset packaging, etc. Since the cut cannot be made in a direction orthogonal to the above, there is a disadvantage that the contents spill depending on the type of the contents.
JP-A-7-285559

  The object of the present invention can be applied to a packaging bag having a convex folded portion at a side edge such as a three-side seal bag, a pillow bag, a gusset bag, etc. An easy-open packaging bag that can be easily opened is provided.

  In order to achieve the above object, the present invention according to claim 1 is a rectangular structure in which at least an easily tearable film layer and a base material layer are sequentially provided from the surface layer, and a thermoadhesive resin layer is laminated on the innermost layer. A cylindrical body having a palm seal part is formed by overlapping and heat-bonding the opposing edges of the shape laminate so that the innermost layers are in contact with each other, and at least a convex fold is provided on the side edge. In the packaging bag in which the edge portions of the upper and lower opening ends are thermally bonded by the upper and lower edge thermal adhesive portions and sealed, the base layer is formed along the planned opening line with one of the convex folded portions as the opening start end. An opening cut line is formed.

  The easy-open packaging bag of the present invention is composed of a laminate in which at least an easy tear film layer and a base material layer are sequentially provided from the surface layer, and a heat-adhesive resin layer is laminated on the innermost layer. By forming the opening cut line in the material layer, it is possible to easily tear and open along the opening cut line.

  Furthermore, since the easy tear film layer is laminated on the surface layer of the base material layer on which the opening cut line is formed, there is an effect that it has strength as a packaging bag and can be prevented from being bent from the opening cut line. is there.

  In addition, by laminating an easily tearable film layer on the surface layer, it becomes possible to tear along the opening cut line even if the opening cut line has a shape other than a straight line. In addition, since the cut line for opening is not visible from the surface of the packaging bag, the appearance of the packaging bag is improved.

The above-described present invention will be described in detail below with reference to the drawings. 1 is a perspective view of a main part of a first embodiment of an easy-open packaging bag according to the present invention, FIG. 2 is a perspective view of a main part showing an opened state of the easy-open packaging bag of FIG. 1, and FIG. XX sectional drawing, FIG. 4 is a principal part perspective view of 2nd embodiment of the easily openable packaging bag concerning this invention, FIG. 5 is a perspective view which shows 3rd embodiment of the easily openable packaging bag concerning this invention. FIG. 6 and FIG. 6 are a rear view and a YY sectional view showing a third embodiment of the easy-open packaging bag according to the present invention, and the broken line in the figure is formed on the base material layer along the planned opening line. The opening line for opening is shown.
(First embodiment)
First, the first embodiment of the easy-open packaging bag according to the present invention will be described with reference to FIGS. 1, 2, and 3. As shown in FIG. 1, the easy-open packaging bag 1 of the present invention is a rectangular laminate in which at least an easy tear film layer and a base material layer are sequentially provided from the surface layer, and a heat-adhesive resin layer is laminated on the innermost layer. The opposite edges of the heat-sensitive adhesive layer are overlapped so that the heat-adhesive resin layer comes into contact with each other and heat-bonded to form a cylindrical body having the palm seal portion 10, and the palm seal portion 10 is positioned at the center of the easy-open packaging bag 1. As shown in the figure, folding parts A and B having a V-shaped cross section are provided on opposite side parts of the cylindrical body, and convex folding parts A11 and A12 are provided at the side edges on the folding part A side. Thus, it is configured to have convex folds B11 and B12 on the side edge on the folding part B side, and the upper and lower opening edges are connected to the upper edge thermal bonding part 20 and the lower edge thermal bonding part (not shown). And a gusset bag that is heat-bonded and sealed, and provided on one of the convex folds A11 and A12. From the sealing start ends A21 and A22 to the unsealing end A4 provided at the edge of the upper edge thermal bonding portion 20 between the palm seal portion 10 and the V-shaped tip portion A3 of the folding portion A and substantially reverse. An L-shaped opening schedule line C is provided. Furthermore, the bending start point of the planned opening line C on the side of the joint seal portion 10 via the opening start ends A21 and A22 along the planned opening line C from the bending start point D of the planned opening line C on the side facing the palm seal portion 10. An opening line 30 for opening having a substantially straight cross section M-shaped connecting D is formed in the base material layer. The shape of the opening cut line 30 may be a discontinuous cut consisting of a cut portion and a non-cut portion, and is not particularly limited, but the length of the cut portion is preferably 0.3 to 2.0 mm, Furthermore, 0.5 to 1.0 mm is more preferable. The length of the non-cut portion is preferably 0.3 to 1.0 mm, and more preferably 0.5 to 0.8 mm. If the length of the non-cut portion exceeds 1.0 mm, the tearing and opening properties are deteriorated when the opening direction is deviated. On the other hand, if it is less than 0.3 mm, the uncut portion may be cut during the production of the laminated body, and the laminated body may be cut or wrinkled during the production, which is not preferable. From the viewpoint of easy opening, it is preferable to form the cut portion so as to straddle the opening start ends A21 and A22 provided in the convex folded portions A11 and A12. Further, the opening cut line 30 can be provided along the planned opening line C from the opening start end A21, A22 to the opening end end A4, A4. Alternatively, the opening cut line 30 may be formed on the entire circumference of the easy-open packaging bag 1 in parallel with the upper end edge from the opening start ends A21 and A22 to open the entire upper end.

  The easy-open packaging bag 1 in the form of a gusset bag thus configured has excellent sealing properties and easy-openability, and is provided at one of the convex folded portions A11 and A12 as shown in FIG. When opening is started from the opening start ends A21 and A22 and is torn along the opening cut line 30 formed in the base material layer until reaching the bending start points D and D, and then pulled upward, By using the tear film, it is easily torn until reaching the opening end A4, A4, and a part of the upper end of the easy-open packaging bag 1 is cut off to form the opening 40, and the contents are It can be easily taken out. The opening cut line 30 formed in the base material layer can be formed in accordance with the required size and shape of the opening.

Next, the laminated body used for this invention is demonstrated. 3 is a cross-sectional view taken along line XX of FIG. As shown in FIG. 3, the easy tear film layer 2 and the base material layer 3 are sequentially provided on the surface layer, the thermoadhesive resin layer 4 is laminated on the innermost layer, and the cut portion 5 is formed on the base material layer 3. Yes. Although not shown in the drawing, the oxygen permeability, water vapor permeability, light shielding property, thermal adhesive strength (heat seal strength), puncture strength, drop strength, and other protective functions required for the laminate are satisfied. Between the base material layer 3 and the heat-adhesive resin layer 4, an aluminum foil, an aluminum vapor-deposited plastic film, a plastic film in which an inorganic material such as a metal oxide such as aluminum oxide or silicon oxide is vapor-deposited, or a gas barrier composition such as polyvinyl alcohol is used. An intermediate layer having a barrier property such as a coated plastic film and an ethylene vinyl alcohol copolymer film may be provided. In this case, the use of a stretched film can improve the tear-opening property, and is more preferable.
The easily tearable film layer 2 is preferably a film that tears in all directions. For example, easily tearable polyester in which cellophane, a 6 μm thick polyester film, or at least two polyester resin layers having different melting points are laminated, etc. Can be used. As the base material layer 3, a film having transparency and printability can be used. For example, a stretched film of polyester, polypropylene, polyamide, or a laminated film obtained by laminating these films can be used. Moreover, the opening line 30 can be put in the base layer 3 at a predetermined position simultaneously with printing, for example, by a rotary die roll or the like. In addition, after printing, the opening cut line 30 may be put at a predetermined position by, for example, a rotary die cutter or a pulse oscillation type laser irradiation. The heat-adhesive resin layer 4 is not particularly limited as long as it is a heat-adhesive resin. For example, a well-known heat-adhesive resin such as polyethylene or polypropylene can be used, and lamination is performed using a T-die extruder. Lamination methods such as sandwich lamination and dry lamination using an adhesive can be used.

Next, a second embodiment will be described with reference to FIG.
(Second embodiment)
As shown in FIG. 4, the easy-open packaging bag 1 ′ of the second embodiment according to the present invention is in the form of a four-pillar gusset bag using the same laminate as the gusset bag of the first embodiment. That is, the opposing edges of the rectangular laminate are overlapped and thermally bonded so that the heat-adhesive resin layer 4 comes into contact with each other to form a cylindrical body having the joint seal portion 10, and both opposite sides of the cylindrical body Folded parts A and B having a V-shaped cross section are provided in the part, and the palm seal part 10 is configured to be positioned at one side edge of the folded part B, and the convex folded part B11 is provided at the other side edge. It is constituted so that it has convex folding parts A11, A12 at the side edge on the folding part A side, and the side edge thermal bonding part A31 on the convex folding parts A11, A12, B11. A32, B31 are formed, and the edge portions of the upper and lower opening ends are thermally bonded by the upper edge thermal adhesive portion 20 and the lower edge thermal adhesive portion (not shown) to form a four-pillar gusset bag, Opening start ends A21 and A22 are provided at the end edges of the convex folds A11 and A12. That. Furthermore, from the opening end point E provided on the front panel 50 in the middle of the V-shaped tip of the folding part A and the V-shaped tip of the folding part B, through the opening start ends A21 and A22 along the planned opening line. An opening break line 30 having an M-shaped cross section that connects the opening end point E provided at a position facing the opening end point E provided on the front panel 50 of the back panel 60 in a substantially straight line is formed in the base material layer. Has been. The easy-open packaging bag 1 'in the form of a 4-pillar gusset bag configured as described above has excellent sealing properties and easy-opening properties. When opening, although not shown, the ends of one of the convex folded portions A11 and A12 Opening is started from the opening start ends A21 and A22 provided at the edge, and the tear pieces are torn along the opening cut line 30 formed in the base material layer until reaching the opening end points E and E. The opening is formed by bending on the part B side, and the contents can be easily taken out. When the tear piece is pulled upward, the tear piece can be easily torn and removed by using an easy tear film. Others are the same as in the first embodiment, and a description thereof will be omitted.

Next, the easy-open packaging bag 1 '' according to the third embodiment of the present invention will be described with reference to FIGS.
(Third embodiment)
As shown to FIG. 5, FIG. 6, 3rd embodiment is made into the form of the pillow bag using the laminated body of the same structure as 1st embodiment. That is, the opposing edges of the rectangular laminated body are superposed and thermally bonded so that the heat-adhesive resin layer 4 comes into contact with each other to form a tubular body having a palm seal portion 10 (see FIG. 6). 10 is configured to have convex folds A11 and B11 on opposite side portions of the cylindrical body so that 10 is located in the center of the easy-open packaging bag 1 '', and the edge portions of the upper and lower opening ends are formed. A pillow bag that is thermally bonded and sealed by the upper edge thermal bonding section 20 and the lower edge thermal bonding section 70 is provided, and an opening start end A21 is provided at the edge of one convex folded section A11. Along the cut line 30 for opening is formed in the base material layer 3 over the entire circumference of the pillow bag in a substantially straight line parallel to the upper edge thermal bonding part 20. As shown in the YY sectional view of FIG. 6, the easy tear film layer 2 and the base material layer 3 are sequentially provided on the surface layer, the thermoadhesive resin layer 4 is laminated on the innermost layer, and the base material layer 3 is further laminated. A cut portion 5 is formed. The easy-open packaging bag 1 '' in the form of a pillow bag thus configured has excellent sealing properties and easy-opening properties. At the time of opening, although not shown, opening is started from the opening start end A21. It tears along the tear line 30 for opening formed in the layer 3, reaches the other convex fold B11 and is cut off as a tear piece including the upper edge thermal bonding part 20, an opening is formed, and the contents are It can be easily taken out. The opening cut line 30 can be partially provided by a planned opening line. In that case, when the tear piece is pulled toward the upper edge thermal bonding portion 20, the tear piece can be easily torn and removed by using the easy tear film. Others are the same as in the first embodiment, and a description thereof will be omitted.

  Next, the present invention will be described in more detail with reference to examples.

  Using a biaxially stretched polypropylene film (hereinafter referred to as OPP) having a thickness of 20 μm that has been subjected to double-side corona treatment on the base material layer, a printed pattern layer is provided by performing gravure printing on one surface using urethane-based ink. And an opening break through the OPP using a rotary die cutter composed of a rotary die roll and an anvil roll having a cutting edge projecting at a predetermined position on the circumferential surface along a planned opening line provided at a predetermined position. The line 30 was formed as a broken line with a cut portion length of 1.0 mm and a non-cut portion length of 0.5 mm. Thereafter, an easily tearable biaxially stretched polyester film (product name: TF110, manufactured by Toyobo Co., Ltd., hereinafter referred to as PET) having a thickness of 14 μm as an easy tear film layer on the surface of the OPP is formed as an intermediate layer on the lower surface with an aluminum thickness of 7 μm. A foil (hereinafter referred to as ALM) is laminated by a dry lamination (hereinafter referred to as DL) system via a urethane adhesive, and further, an ALM surface is provided with a urethane anchor coat, and a low-density polyethylene film having a thickness of 40 μm. (Hereinafter referred to as LDPE) was melt extruded by low-density polyethylene (hereinafter referred to as PE) at a thickness of 20 μm using a T-die extruder, sandwiched and laminated, and PET 14 μm / DL / OPP 20 μm / printed pattern layer / AC / PE 20 μm / A laminate having an LDPE of 40 μm was produced. Using the laminate, an easy-open packaging bag 1 in the form of a gusset bag shown in the first embodiment was produced.

  Using the laminate produced in Example 1, an easy-open packaging bag 1 'in the form of a 4-pillar gusset bag shown in the second embodiment was produced.

  Using the laminate produced in Example 1, an easy-open packaging bag 1 ″ in the form of a pillow bag shown in the third embodiment was produced.

  All the easy-open packaging bags produced above could be easily opened along the planned opening line, an opening could be formed, and the contents could be taken out.

It is a principal part perspective view of 1st embodiment of the easy-open packaging bag concerning this invention. It is a principal part perspective view which shows the open state of the easily openable packaging bag of FIG. It is the XX sectional view taken on the line of FIG. It is a principal part perspective view of 2nd embodiment of the easy-open packaging bag concerning this invention. It is a perspective view which shows 3rd embodiment of the easily openable packaging bag concerning this invention. It is the rear view and YY sectional view which show 3rd embodiment of the easily openable packaging bag concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 ', 1''Easy-open packaging bag 2 Easy tear film layer 3 Base material layer 4 Thermal-adhesive resin layer 5 Cut part 10 Joint seal part 20 Upper edge thermal bonding part 30 Opening cut line 40 Opening part 50 Front panel 60 Rear panel 70 Lower edge thermal bonding part A, B Folding part A11, A12, B11, B12 Convex folding part A21, A22 Opening start end A3 V-shaped front end part A31, A32, B31 Side edge thermal bonding part A4, A4 Opening end C Opening expected line D Bending start point E Opening end point

Claims (1)

At least the easy tear film layer and the base material layer are sequentially provided from the surface layer, and the opposing end edges of the rectangular laminate in which the heat-adhesive resin layer is laminated on the innermost layer are overlapped so that the innermost layers are in contact with each other. It is formed into a cylindrical body having a palm seal part by heat bonding, and is configured to have a convex folded part at least on the side edge, and the edge part of the upper and lower opening ends is thermally bonded by the upper and lower edge thermal bonding parts. An easily openable packaging bag, wherein a cut line for opening is formed in a base material layer along a planned opening line with one of the convex folds as an opening start end in the sealed packaging bag.

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