JP4697910B2 - Easy-open packaging bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an easy-open packaging bag excellent in design that can be easily opened by tearing from a notch.
[0002]
[Prior art]
Conventionally, as an easy-open packaging bag having a configuration in which a score line is formed by irradiation with a carbon dioxide laser along a tear line when opening the packaging bag, as described in JP-A-7-291307, Carbon dioxide laser absorption, which is the outermost surface of a packaging bag, consisting of a laminated film having a carbon dioxide laser absorption layer such as biaxially stretched polyethylene terephthalate and biaxially stretched nylon, an ethylene-vinyl alcohol copolymer layer, and a thermal adhesive resin layer. An easy-open packaging bag or the like having a structure in which a cut line is formed on the layer by irradiation with a carbon dioxide laser is known.
However, the easy-open packaging bag having the above-described configuration has a drawback that the design is impaired because the score line is visible from the outer surface of the packaging bag.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide an easy-open packaging bag that is excellent in design properties and has excellent gas barrier properties and rigidity because the cut line is not visible from the surface.
[0004]
[Means for Solving the Problems]
In the packaging bag which consists of a laminated film which has an outer surface layer, an aluminum layer, a carbon dioxide laser absorption layer, and a heat-adhesive resin layer, the easy-open packaging bag of the present invention according to claim 1 is used for opening the packaging bag. A cut line is formed in the carbon dioxide laser absorption layer by a carbon dioxide laser along the tear line, and a thickness of 20 μm to 40 μm formed by hot melt extrusion between the aluminum layer and the carbon dioxide laser absorption layer of the laminated film. The packaging bag is a pillow-type bag formed by a joint heat-bonding portion and edge heat-bonding portions at both ends of the joint-heat bonding portion. It consists of the structure in which the score line extended in the direction of a both-sides end from the notch formed in the heat bonding part was formed .
[0005]
The easy-open packaging bag of the present invention according to claim 2 is a packaging bag comprising a laminated film having an outer surface layer, an aluminum layer, a carbon dioxide laser absorption layer, and a heat-adhesive resin layer, and when opening the packaging bag. A cut line is formed in the carbon dioxide laser absorption layer by a carbon dioxide laser along the tear line, and a thickness of 20 μm to 40 μm formed by hot melt extrusion between the aluminum layer and the carbon dioxide laser absorption layer of the laminated film. The packaging bag is formed by a palm heat-bonding portion and edge heat-bonding portions at both ends of the palm-heat bonding portion and parallel to the palm-bonding heat bonding portion. It is a gusset pillow type bag in which inwardly folded portions are formed at both side ends, and a cut line extending in the direction of both side ends is formed from the notch formed in the joint heat-bonding portion. It is characterized by comprising .
[0006]
In Claims 1 and 2 above, the carbon dioxide laser absorbing layer has a score line formed by a carbon dioxide laser along a tear line when the packaging bag is opened. Since the score line formed in the carbon dioxide laser absorption layer cannot be seen from the outer surface of the packaging bag, it can be an easily openable packaging bag that does not impair the design. Moreover, since the laminated film has a structure in which a protective layer made of a polyolefin resin having a thickness of 20 μm to 40 μm is formed between the aluminum layer and the carbon dioxide laser absorption layer, the polyolefin resin does not absorb the carbon dioxide laser. When the cut line is formed in the carbon dioxide laser absorption layer by the irradiation of the carbon dioxide laser without being affected by the carbon dioxide laser, damage to the aluminum layer adjacent to the formed cut line may be damaged. Since it can prevent, it can be set as the easy-open packaging bag which does not impair the gas barrier property of a laminated | multilayer film, and does not impair the designability. Moreover, since the protective layer is formed by hot melt extrusion, the protective layer made of polyolefin resin becomes an adhesive layer for bonding the aluminum layer and the carbon dioxide laser absorbing layer. Efficiency can be improved .
[0007]
Further, in the first and second aspects, the easy-open packaging bag is a pillow type packaging bag or a gusset pillow type bag, and a cut line extending in the direction of both side ends from the notch formed in the joint heat-bonding portion is formed. With this configuration, it is possible to easily open the tear line by starting the tear line from the notch of the palm-to-grind heat bonding portion and tearing along the score line .
[0008]
In the easy-open packaging bag of the present invention according to claim 3, the score line extends from a notch formed in the palm heat-bonding portion near one edge heat-bonding portion to the edge heat-bonding portion. It is formed so as to extend in a V shape. By comprising in this way, it can tear easily toward the direction of one edge thermal-bonding part from the notch | incision of a palm heat-bonding part .
[0009]
The easily openable packaging bag of the present invention according to claim 4 is characterized in that the score line is formed over the entire circumference of the packaging bag. With this configuration, since the entire circumference can be opened, the opening is enlarged and the contents can be easily taken out .
[0010]
The easy-open packaging bag of the present invention according to claim 5 is a packaging bag comprising a laminated film having an outer surface layer, an aluminum layer, a carbon dioxide laser absorption layer, and a heat-adhesive resin layer, and when opening the packaging bag. A cut line is formed in the carbon dioxide laser absorption layer by a carbon dioxide laser along the tear line, and a thickness of 20 μm to 40 μm formed by hot melt extrusion between the aluminum layer and the carbon dioxide laser absorption layer of the laminated film. The packaging bag has a configuration including a protective layer made of polyolefin resin, and the packaging bag has opposing side end thermal bonding portions, upper end thermal bonding portions and bottom thermal bonding portions at both ends of the side end thermal bonding portions, and A self-supporting bag whose bottom is folded inward, and a cut line extending in a direction perpendicular to the side end thermal bonding portion is formed from a notch formed in an end edge portion of the side end thermal bonding portion. It is characterized by comprising. By comprising in this way, a packaging bag can be teared linearly along a score line from the notch | incision of an edge thermal bonding part, and it can open easily .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing the structure of a laminated film, FIG. 3 is a plan view showing a second embodiment of the present invention, and FIG. 4 is a third view of the present invention. FIG. 5 is a plan view showing a continuous laminated film for producing the easy-open packaging bag of the first embodiment of the present invention, and FIG. 6 is a sectional view showing another configuration of the laminated film. 2 is a joint thermal bonding part, 2 'is a joint thermal bonding area, 3a and 3b are edge thermal bonding parts, 3a' and 3b 'are edge thermal bonding areas, 4 is a cut, 5 is a score line, 6 is a folding portion, 7 is a side edge thermal bonding portion, 8 is an upper end thermal bonding portion, 9 is a cut line, 11 is an outer surface layer, 12 and 14 are adhesive layers, 13 is an aluminum layer, 15 is a carbon dioxide laser absorption layer, 16 represents a heat-adhesive resin layer, and 17 represents a protective layer.
[0012]
As shown in FIG. 1, the first embodiment of the present invention is formed by a palm thermal adhesive portion 2, an edge thermal adhesive portion 3 a, and an edge thermal adhesive portion 3 b, and on both side end portions parallel to the palm thermal adhesive portion 2. It is a gusset pillow type bag in which an inwardly folded portion 6 is formed, and a notch 4 is formed at the side end of the palm thermal bonding portion 2 close to one edge thermal bonding portion 3a. A cut line 5 is formed which extends in a V shape from the edge to the edge thermal bonding part 3a, crosses the folding part 6 and is connected between the edges on the front side of the bag. By grasping the upper part of the notch 4 of the joint thermal bonding part 2 of the packaging bag of the first embodiment and pulling upward, the laminated film on the side where the joint thermal bonding part 2 of the packaging bag is located can be removed from the notch 4 part. Since it cuts in the shape of a letter and the folding part 6 on both sides and the laminated film on the front side are cut along the cut line 5, it can be opened largely.
[0013]
As shown in FIG. 2, the laminated film is constructed by laminating an outer surface layer 11, an adhesive layer 12, an aluminum layer 13, an adhesive layer 14, a carbon dioxide laser absorption layer 15, and a thermal adhesive resin layer 16 in order from the outer surface. A cut line 5 is formed in the gas laser absorption layer 15. By irradiating the carbon dioxide laser from the surface of the heat adhesive resin layer 16 of the laminated film, the heat adhesive resin layer 16 does not absorb the carbon dioxide laser, so it passes therethrough, and the carbon dioxide laser is absorbed by the carbon dioxide laser absorption layer 15. Thus, the cut line 5 is formed. The aluminum layer 13 is a layer for blocking the carbon dioxide laser so as not to affect the outer surface layer 11 and for making the cut line 5 formed in the carbon dioxide laser absorbing layer 15 inconspicuous from the outer surface. A vapor deposition layer may be used. In the case of this laminated film, the formed cut line 5 is concealed by the aluminum layer 13 and cannot be seen from the outer surface of the packaging bag, so that the design is not impaired.
[0014]
As shown in FIG. 6, the other structure of the laminated film is that an outer surface layer 11, an adhesive layer 12, an aluminum layer 13, a protective layer 17, a carbon dioxide laser absorption layer 15, and a thermal adhesive resin layer 16 are laminated in order from the outer surface. A structure in which a score line 5 is formed in the carbon dioxide laser absorption layer 15 and is different from the laminated film shown in FIG. 2 in that the adhesive layer 14 is a protective layer 17 made of polyolefin resin. It is. In the case of the laminated film having the structure shown in FIG. 6, when the cut line 5 is formed in the carbon dioxide laser absorbing layer 15 by irradiating the carbon dioxide laser from the inner surface side, the aluminum layer 13 is cracked due to variations in the carbon dioxide laser. It is possible to prevent the deterioration of the inlet gas barrier property or the appearance failure by the protective layer 17 made of polyolefin resin. The protective layer 17 is formed to a thickness of 20 μm to 40 μm.
[0015]
As shown in FIG. 3, the second embodiment of the present invention is a pillow type bag formed by a palm heat bonding portion 2, an edge thermal bonding portion 3 a, and an edge thermal bonding portion 3 b, and has one edge heat. A notch 4 is formed at the side end of the joint thermal bonding part 2 close to the bonding part 3a, and a cut line 5 extending in a V shape from the notch 4 to the edge thermal bonding part 3a is formed. is there. By grasping the upper part of the notch 4 of the palm heat bonding part 2 of the packaging bag of the second embodiment and pulling it upward, the laminated film on the back side where the palm heat bonding part 2 of the packaging bag is located from the part of the notch 4 The upper part of the packaging bag can be opened by cutting into a V shape. The configuration of the laminated film in the second embodiment is also as shown in FIGS.
[0016]
In the first and second embodiments, the cut line 5 is formed in a V-shape from the notch 4 of the jointed thermal bonding part 2 to the edge thermal bonding part 3a side. It does not matter as a form formed in a direction orthogonal to the palm-and-palm heat bonding portion 2. Moreover, it is good also as a form which forms the score line 5 in the state which left the laminated | multilayer film of the front side, and makes it auxiliary when pouring out contents, such as a powder.
[0017]
As shown in FIG. 4, the third embodiment of the present invention is a self-supporting bag having a configuration in which the side end thermal bonding portion 7 and the upper end thermal bonding portion 8 are opposed and the bottom portion is folded inward. A structure in which a straight cut line 5 parallel to the upper end thermal bonding portion 8 is formed in the vicinity of the upper end thermal bonding portion 8, and a cut 4 is formed in each of the side end thermal bonding portions 7 corresponding to both ends of the cut line 5. It can be cut in a straight line and opened by tearing the laminated film from the notch 4 portion of the side end heat bonding portion 7. The configuration of the laminated film in the third embodiment is also as shown in FIGS. In the third embodiment, the shape is a self-supporting bag, but it can also be a three-side sealed bag or a four-side sealed bag.
[0018]
The continuous laminated | multilayer film for producing the easily openable packaging bag of 1st Embodiment are as showing in FIG. The continuous laminated film has a predetermined width for producing a gusseted pillow type bag, and both sides of the laminated film are provided with a palm heat-bonding region 2 ′ having a predetermined width, and the length of the packaging bag in the vertical direction. A cut line 9 is provided at an interval corresponding to the length, and an edge thermal bonding region 3b 'is provided at the upper part sandwiching the cut line 9, and an edge thermal bonding region 3a' is provided at the lower part. Cuts 4 are formed in the thermal bonding area 2 ′ at positions spaced from the lower edge of the edge thermal bonding area 3a ′ at intervals corresponding to the length of the packaging bag in the vertical direction. It has a configuration in which continuous cut lines 5 are formed which extend obliquely from the cuts 4 to the edge thermal bonding region 3a 'side, cross the folds 6 and connect the edges.
[0019]
The joint thermal bonding regions 2 ′ on both sides of the continuous laminated film shown in FIG. 5 are joined together and thermally bonded to form a joint thermal bonding region, and the edge thermal bonding region 3b ′ is thermally bonded and then the edge thermal bonding is performed. The bag is made by cutting along a cut line 9 between the region 3a ′ and the edge thermal bonding region 3b ′. The easy-open packaging bag of the first embodiment shown in FIG. 1 is obtained by filling the packaged bag with the contents and thermally bonding the edge thermal bonding region 3a ′. In the process of making a bag with a bag making machine using a laminated film slit to a predetermined width, a carbon dioxide laser is irradiated from the heat-adhesive resin layer surface of the laminated film to form a predetermined cut line 5 at a predetermined position. At the same time, a cut 4 is formed at the edge of the score line 5 in the edge thermal bonding region 3a ′ and the edge thermal bonding region 3b ′.
[0020]
As the outer surface layer constituting the laminated film, biaxially stretched polyethylene terephthalate, biaxially stretched polypropylene, biaxially stretched nylon or the like can be used. An aluminum foil or an aluminum vapor deposition layer can be used as the aluminum layer. As the carbon dioxide laser absorbing layer, biaxially stretched polyethylene terephthalate, biaxially stretched nylon, polycarbonate or the like can be used. Since these films absorb a carbon dioxide laser with a wavelength of 10.6 μm, the irradiated portion of the film generates heat, melts and mists by condensing the carbon dioxide laser and irradiating these film surfaces. Alternatively, it can be removed by heat generation, decomposition, ashing, etc. to form a score line. As the thermal adhesive resin layer, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, unstretched polypropylene, ethylene-propylene copolymer, etc. can be used. Since it has a property of transmitting without being absorbed, a cut line is not formed even when irradiated with a carbon dioxide laser.
[0021]
As the protective layer 17 constituting the laminated film, a polyolefin resin that hardly absorbs a carbon dioxide gas laser such as low density polyethylene, medium density polyethylene, high density polyethylene, unstretched polypropylene, biaxially stretched polypropylene can be used. It is formed to a thickness of 20 μm to 40 μm. When using low-density polyethylene, medium-density polyethylene, high-density polyethylene, or unstretched polypropylene, it can be formed by hot melt extrusion, so it becomes an adhesive layer for laminating the aluminum layer and carbon dioxide laser absorption layer. The manufacturing process can be made more efficient. When biaxially stretched polypropylene, high-density polyethylene, or unstretched polypropylene is used, it is preferable to laminate a film made of the above resin by dry lamination using a urethane-based adhesive.
[0022]
Specific examples of the structure of the laminated film include biaxially stretched polyethylene terephthalate / aluminum foil / biaxially stretched polyethylene terephthalate / polyethylene, biaxially stretched polyethylene terephthalate / aluminum foil / biaxially stretched polyethylene terephthalate / polypropylene, biaxially stretched polyethylene terephthalate / Aluminum vapor deposition layer / biaxially stretched polyethylene terephthalate / polyethylene, biaxially stretched polypropylene / aluminum foil / biaxially stretched polyethylene terephthalate / polyethylene, biaxially stretched polyethylene terephthalate / aluminum foil / biaxially stretched nylon / polyethylene, biaxially stretched polyethylene terephthalate / an aluminum foil / biaxially stretched nylon / polypropylene, switching the carbon dioxide laser is provided underlined film Lines are formed. As an adhesive layer for laminating each layer, urethane resin, hot-melt extruded polyethylene or the like can be used.
[0023]
Specific examples of the structure of the laminated film having a protective layer include biaxially stretched polyethylene terephthalate / aluminum foil / extruded polyethylene (protective layer) / biaxially stretched polyethylene terephthalate / polyethylene, biaxially stretched polyethylene terephthalate / aluminum vapor deposited layer / extruded polyethylene. (Protective layer) / biaxially stretched polyethylene terephthalate / polyethylene, biaxially stretched polypropylene / aluminum foil / extruded polyethylene (protective layer) / biaxially stretched polyethylene terephthalate / polyethylene, biaxially stretched polyethylene terephthalate / aluminum foil / biaxially stretched nylon / polyethylene, biaxially stretched polyethylene terephthalate / aluminum foil / extruded polyethylene (protective layer) / biaxially stretched nylon / polyethylene, biaxially oriented polyethylene terephthalate Aluminum foil / dry lamination / biaxially oriented polypropylene (protective layer) / a dry lamination / biaxially stretched polyethylene terephthalate / polyethylene.
[0024]
In order to form a score line by irradiating carbon dioxide laser on a carbon dioxide laser absorption layer made of biaxially stretched polyethylene terephthalate or biaxially stretched nylon of the laminated film having the above structure, a wavelength of 10.6 μm is formed from the polyethylene or polypropylene surface on the inner surface. A cut line can be formed by irradiating the carbon dioxide gas laser under the conditions of an output of 50 W, a pulse duration of 50 μsec, a repetition of 200 μsec, and a scan speed of 1500 to 2000 mm / sec.
[0025]
【The invention's effect】
In a packaging bag made of a laminated film having an outer surface layer, an aluminum layer, a carbon dioxide laser absorption layer, and a heat-adhesive resin layer, the carbon dioxide laser absorption layer is cut by a carbon dioxide laser along a tear line when the packaging bag is opened. Easy-open packaging that does not impair the design because the cut line formed in the carbon dioxide laser absorption layer laminated on the inner side of the aluminum layer is not visible from the outer surface of the packaging bag. It can be a bag.
[0026]
In the above easy-open packaging bag, the laminated film has a structure in which a protective layer made of a polyolefin resin having a thickness of 20 μm to 40 μm is formed between the aluminum layer and the carbon dioxide laser absorption layer. Since it does not absorb the gas laser, it is not affected by the carbon dioxide laser, and when the cut line is formed in the carbon dioxide laser absorption layer by irradiation with the carbon dioxide laser, a crack is formed in the aluminum layer adjacent to the formed cut line, etc. Therefore, it is possible to obtain an easy-open packaging bag which does not deteriorate the gas barrier property of the laminated film and does not impair the design property.
[0027]
In the easy-open packaging bag, since the protective layer is formed by hot melt extrusion, the protective layer made of polyolefin resin becomes an adhesive layer for bonding the aluminum layer and the carbon dioxide laser absorbing layer. The manufacturing process of the laminated film having the protective layer can be made efficient.
[0028]
In the above easy-open packaging bag, the packaging bag is a pillow type bag or a gusset pillow type bag formed by the edge heat bonding part and the edge heat bonding part at both ends of the gas palm heat bonding part. With the configuration in which the cut line extending in the direction of the both side ends from the cut is formed, tearing can be started from the cut of the joint thermal bonding portion and tearing can be performed along the cut line.
[0029]
In the easy-open packaging bag, the packaging bag has a shape having a side end thermal bonding portion facing, a score line is formed in a direction perpendicular to the side end thermal bonding portion, and at least one side end thermal bonding portion. By setting it as the structure in which the notch was formed in the edge part of a score line, a packaging bag can be teared linearly along a score line from the notch of an edge thermal bonding part, and it can open easily.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration of a laminated film.
FIG. 3 is a plan view showing a second embodiment of the present invention.
FIG. 4 is a plan view showing a third embodiment of the present invention.
FIG. 5 is a plan view showing a continuous laminated film for producing the easy-open packaging bag of the first embodiment of the present invention.
FIG. 6 is a cross-sectional view showing another configuration of the laminated film.
[Explanation of symbols]
2 Jointed thermal bonding part
2 'gas palm thermal bonding area
3a, 3b Edge thermal bonding
3a ', 3b' Edge thermal bonding area 4 Notch 5 Cut line 6 Folding part 7 Side thermal bonding part 8 Upper thermal bonding part 9 Cut line
11 outer layer
12, 14 Adhesive layer
13 Aluminum layer
15 Carbon dioxide laser absorption layer
16 Thermal adhesive resin layer
17 Protective layer

Claims (5)

In a packaging bag comprising a laminated film having an outer surface layer, an aluminum layer, a carbon dioxide laser absorption layer, and a heat-adhesive resin layer, a carbon dioxide laser is applied to the carbon dioxide laser absorption layer along a tear line when the packaging bag is opened. Is formed with a protective layer made of a polyolefin resin having a thickness of 20 μm to 40 μm formed by hot melt extrusion between the aluminum layer of the laminated film and the carbon dioxide laser absorbing layer . The packaging bag is a pillow-type bag formed by a joint thermal adhesive portion and edge thermal adhesive portions at both ends of the joint thermal adhesive portion, in the direction of both side ends from the notches formed in the joint thermal adhesive portion. An easily openable packaging bag characterized by comprising a configuration in which an extending score line is formed . In a packaging bag comprising a laminated film having an outer surface layer, an aluminum layer, a carbon dioxide laser absorption layer, and a heat-adhesive resin layer, a carbon dioxide laser is applied to the carbon dioxide laser absorption layer along a tear line when the packaging bag is opened. Is formed with a protective layer made of a polyolefin resin having a thickness of 20 μm to 40 μm formed by hot melt extrusion between the aluminum layer of the laminated film and the carbon dioxide laser absorbing layer. Gusset in which the packaging bag is formed by a jointed thermal adhesive part and edge thermal adhesive parts at both ends of the jointed thermal adhesive part, and inwardly folded parts are formed at both ends parallel to the jointed thermal adhesive part Easy-opening characterized in that it is a pillow type bag and has a structure in which score lines extending in the direction of both side ends from the notches formed in the palm-to-grip heat bonding portion are formed. Sex packaging bag . The cut line is formed so as to extend in a V shape in the direction of the edge thermal bonding portion from a cut formed in the palm thermal bonding portion close to one edge thermal bonding portion. The easy-open packaging bag according to claim 1 or 2 . The easy-open packaging bag according to any one of claims 1 to 3, wherein the score line is formed over the entire circumference of the packaging bag . In a packaging bag comprising a laminated film having an outer surface layer, an aluminum layer, a carbon dioxide laser absorption layer, and a heat-adhesive resin layer, a carbon dioxide laser is applied to the carbon dioxide laser absorption layer along a tear line when the packaging bag is opened. Is formed with a protective layer made of a polyolefin resin having a thickness of 20 μm to 40 μm formed by hot melt extrusion between the aluminum layer of the laminated film and the carbon dioxide laser absorbing layer. The packaging bag is a self-supporting bag having side thermal contact portions facing each other, upper end thermal adhesion portions and bottom thermal adhesion portions at both ends of the side end thermal adhesion portions, and a bottom portion folded inward, An easily openable packaging bag comprising a structure in which a score line extending in a direction perpendicular to the side end thermal bonding portion is formed from a notch formed in an edge portion of the side end thermal bonding portion .

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