JP2001270043A - Laminated material for easily tearably packaging, manufacturing method for the same and packaging bag using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated material for easily tearably packaging used for a packaging bag having easy tearability in the case of taking out a material to be packaged. SOLUTION: The laminated material for easily tearably packaging comprises at least two layers of laminated synthetic resin materials 1, 4 each containing a base material 1 made of a stretched synthetic resin material, and a coating layer 3 arranged at a laminated surface side of the material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to an easily tearable laminated material for packaging, a method for producing the same, and a packaging bag using the same. More specifically, the present invention relates to liquids and kneaded materials such as soy sauce, hot pepper and miso, and solid materials. TECHNICAL FIELD The present invention relates to a synthetic resin laminated material which is applied to packaging materials such as powders and can be easily opened when taking out contents, a method for producing the same, and an easily openable packaging bag using the same.

[0002]

2. Description of the Related Art Conventionally, foodstuffs, seasonings and the like have been widely packaged using synthetic resin films as packaging materials. For example, liquid or kneaded seasonings such as soy sauce, sauces and hot peppers have been used. For encapsulation, a packaging bag obtained by molding a synthetic resin film into a bag shape is used. As a synthetic resin film used for such a packaging bag, a laminate film for packaging in which an unstretched thermoplastic synthetic resin layer is laminated on a thermoplastic synthetic resin film having excellent strength, hardness, transparency, and the like is known. ing. The contents of the packaging bag are sealed in a bag formed by heat-sealing the peripheral portion of such a packaging laminate film and heat-sealing an unstretched thermoplastic synthetic resin layer as a sealant layer. It was produced as follows.

In order to take out these contents from the packaging bag, in many cases, a V-shaped opening notch or a straight slit provided in a heat sealing portion of the packaging bag is torn open with a fingertip starting from a fingertip. The contents are taken out by pushing out the contents from the packaging bag opened by the tearing. However, for example, a biaxially stretched polyethylene terephthalate film is used as a stretched thermoplastic synthetic resin material, and a laminate film for packaging in which polyethylene is laminated on the biaxially stretched polyethylene terephthalate film, even if tearing is started from the notch or slit as a starting point, There is a problem that the tear resistance is remarkably increased, and as a result, the entire bag cannot be opened. However, even if the bag is forcibly torn, there is a problem that the traveling direction of the tear cannot be determined.

Therefore, various proposals have been made on the improvement of the easy tearing property of the synthetic resin film for packaging and the easy opening property of the packaging bag.
According to Japanese Patent Publication No. 1 (1994), in order to easily open a plastic film bag by hand, in a bag made of a packaging material in which a heat-adhesive resin is laminated on an inner surface, a line in a direction perpendicular to the outer edge is formed on a sealing portion of the outer edge. There has been proposed an easily-openable bag provided with a weakened region constituted by a concave and convex shape. However, this proposed technique relates to the improvement of the notch or the slit, and has not yet solved the above-mentioned problems.
In addition, since the manufacturing process is complicated, development of a packaging bag which is simple to manufacture and easy to open has been desired.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a packaging laminate in which a stretched synthetic resin material is used as a base material of a packaging laminate material, and a non-stretched thermoplastic synthetic resin material is laminated on the stretched synthetic resin material. An object of the present invention is to provide a laminated material for packaging, which is a material and which maintains tearability even after initiation of tearing, and an easily-openable packaging bag using the same. A further object of the present invention is to provide a method for producing an easily-openable packaging laminate material in which a stretched synthetic resin material and an unstretched thermoplastic synthetic resin material are laminated.

[0006]

Means for Solving the Problems Accordingly, the present inventors have:
As a result of repeated studies to solve the above-mentioned problem, in a laminated packaging material formed by laminating at least two layers of synthetic resin materials, it is possible to improve the easy tearing property by providing a coat layer between the laminated layers. The present inventors have conceived that a packaging bag which can be easily opened can be provided by using the laminated material, and based on these findings, the present invention has been completed.

That is, a first aspect of the present invention resides in a packaging laminate material in which at least two layers of a synthetic resin material including a substrate made of a stretched synthetic resin material are laminated, and a laminate surface side of the substrate. In addition, a coating layer is directly or indirectly provided.

[0008] A second aspect of the present invention is that at least two layers of a synthetic resin material including a substrate made of a stretched synthetic resin material are laminated, and the laminated surface side of the substrate is directly or indirectly attached. The method for producing a laminated material for packaging, in which a coating layer is disposed in an appropriate manner, comprises directly or indirectly applying and drying a coating material on a laminated surface of a substrate made of a stretched synthetic resin material. A coat layer is formed on a substrate, and then a thermoplastic resin layer is laminated on the coat layer.

Further, a third aspect of the present invention is that at least two layers of a synthetic resin material including a base made of a stretched synthetic resin material are laminated, and a direct or indirect manner is provided on the lamination surface side of the base. In an easy-open packaging bag using a packaging laminated material in which a coating layer is formed in a form, the laminated material is superimposed such that the thermoplastic resin layer is on the inner surface, and at the periphery of the laminated material, The storage portion is formed by heat-sealing the thermoplastic resin layer, and a notch or a slit is provided in the heat-sealed portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The easy-open packaging laminate material of the present invention is formed by laminating at least two layers of a synthetic resin material. It is composed of a coat layer disposed on the lamination surface side (lamination surface side) of the base material and at least one thermoplastic synthetic resin layer. Further, a laminated material in which a metal oxide thin film layer is laminated on one of the surfaces of the base material, more preferably on the surface on the lamination side, is selected as a preferred embodiment.

As the stretched synthetic resin material of the packaging material of the present invention, either a uniaxially stretched or biaxially stretched synthetic resin film can be used. Are useful for the present invention, for example, polyethylene terephthalate (PE
T), polyester films such as polyethylene naphthalate, polyolefin films such as polyethylene film and polypropylene film, polyamide film, polystyrene film, polyvinyl chloride film, polycarbonate film, polyacrylonitrile film,
A biaxially stretched film such as an ethylene-vinyl alcohol copolymer film can be used. In particular, a biaxially oriented polyethylene terephthalate film, a biaxially oriented polypropylene, a biaxially oriented nylon or the like is preferable as the base material of the packaging laminate material. The thickness of the base material is arbitrarily selected depending on various uses, but a thickness of usually 3 μm to 200 μm, preferably 10 μm to 30 μm is employed.

Further, as the metal oxide thin film layer which is an element of the layer constitution of the packaging laminate material of the present invention, any of an aluminum oxide layer, a silicon oxide layer, a magnesium oxide layer and the like can be selected. The metal oxide thin film layer is laminated on the base material of the laminated material, and the thickness can be arbitrarily selected depending on the type of the metal oxide, the layer configuration, and the like. 500Å-10
A range of 00 ° is used. The method for forming the metal oxide thin film layer is not particularly limited, and a commonly used vacuum evaporation method such as a laser evaporation method or a flash evaporation method can be employed. Further, an ion beam sputtering method, an ion plating method, or the like may be employed. By forming such a metal oxide thin film layer on a substrate, a transparent vapor-deposited substrate can be obtained. Specifically, for example, alumina-deposited polyethylene terephthalate or nylon, or silica-deposited polyethylene terephthalate or nylon can be used, and a commercially available product may be obtained and used.

[0013] The thermoplastic synthetic resin material constituting the laminated material for packaging of the present invention is not particularly limited, but an unstretched thermoplastic resin layer can be used. For example, an olefin-based polymer layer such as a low-density polyethylene layer, a linear low-density polyethylene layer, and a polypropylene layer, an ethylene-vinyl acetate copolymer layer, a polyvinylidene chloride layer, and the like can be given. It is preferable that these thermoplastic resin materials function as a sealant layer. The thickness of the thermoplastic synthetic resin material is not particularly limited and can be appropriately selected depending on the application.
２００200 μm, preferably 15-100 μm is used.

Next, the coat layer which is a main element of the layer structure of the laminated material for easily tearable packaging of the present invention will be described.
The coat layer is composed of an acrylic polyol resin and a polyurethane resin. The coat layer is disposed on a side of a base material made of a stretched synthetic resin constituting a laminate material, on a laminate surface side with a thermoplastic resin material. The coat layer is particularly preferably formed on the lamination surface of the base material, but may be formed on the lamination surface side of the thermoplastic resin material laminated on the base material. In the case of a substrate on which a metal oxide thin film layer is laminated, the coat layer may be formed on either the metal oxide thin film layer side or the substrate side. The thickness of the coating layer is 0.3 μm to 5 μm, particularly 0.5 μm to 3 μm
Are preferred. When the thickness of the coat layer is less than 0.3 μm, the tearability is not sufficient, and even when the thickness is 5 μm or more, the effect corresponding to the increase in weight cannot be obtained.

[0015] The packaging laminate material of the present invention may be of various types. Particularly preferred packaging laminate materials are, specifically, a base material made of a stretched synthetic resin film, and a base material made of a stretched synthetic resin film. Laminating material for packaging composed of laminated coat layer and unstretched thermoplastic synthetic resin layer, base material of stretched synthetic resin film, metal oxide thin film layer, coat layer and unstretched thermoplastic layer sequentially laminated on it A packaging laminate material composed of a synthetic resin layer, and a metal oxide thin film layer, a stretched synthetic resin film,
A laminating material for packaging constituted by a laminating order of a coat layer and a non-stretched thermoplastic synthetic resin layer.

An embodiment of the packaging laminate material according to the present invention is shown in FIGS. 1 and 2 in a schematic view. The laminated material A shown in FIG. 1 is a biaxially stretched polyethylene terephthalate substrate layer 1
The coating layer 3 is provided on the lamination surface 2 of the above, and a low-density polyethylene layer 4 as a sealant layer is laminated on the coating layer 3. FIG. 2 is a schematic view showing the configuration of another laminated material, in which a silica vapor deposition layer 13 is provided on the lamination surface 12 side of a biaxially stretched polyethylene terephthalate base material layer 11, and the silica vapor deposition layer 13 is provided with a coating layer. 14 and a low-density polyethylene layer 15 are sequentially laminated.

Next, a method for producing the laminated material for packaging according to the present invention will be described.
Step (c); that is, (a) a step of applying a coating agent on a laminated surface of a substrate made of a stretched synthetic resin material or a substrate on which a metal oxide is vapor-deposited and laminated; B) heating and drying the coat layer coated on the base material obtained in the above step, and (c) the step (b).
And a step of laminating an unstretched thermoplastic synthetic resin layer on the coat layer coated on the base material, which has been dried by heating. The print layer can be formed on the surface of the coat layer or between the base material and the coat layer, if necessary.

The method of applying the coating agent in the above production method includes, for example, an acrylic polyol resin,
A method of applying a solution containing a polyurethane resin and silicon dioxide as an antiblocking agent can be adopted. That is, such a coating composition is an acrylic polyol resin, a polyurethane resin and silicon dioxide, specifically, finely divided silica as a coating layer forming component,
A solution obtained by dissolving these in an organic solvent of ketone and aromatic hydrocarbon is used. The amount of each component is
Acrylic polyol resin 1 based on total weight of coating agent
0-20% by weight, preferably 15-17% by weight, polyurethane resin 5-15% by weight, preferably 8-11% by weight, silicon dioxide 1-5% by weight, preferably 2-3% by weight. be able to. As the ketone of the organic solvent, acetone methyl ketone, diethyl ketone, dipropyl ketone, methyl ethyl ketone or the like can be selected and used, and as the aromatic hydrocarbon, benzene, toluene, xylene or the like can be used. A mixed solvent of a ketone and an aromatic hydrocarbon is preferable, and 100 to 100 parts by weight of the coating agent, 30 to 100 parts by weight of the mixed solvent,
In particular, it is preferable to use 30 to 70 parts by weight.
For lamination of the thermoplastic resin material in the step (c), a normal laminating method can be adopted. For example,
Extrusion lamination, glue lamination, or the like may be selected.

In the packaging bag according to the present invention, the above-mentioned laminated material for packaging is overlapped so that the thermoplastic synthetic resin layer thereof is on the inner surface, and the periphery of the laminated material is heat-sealed to form the thermoplastic synthetic resin layer. Are heat-sealed to form a storage portion, and a notch or a slit is provided in the heat-sealed portion, and finally the heat-sealed portion. Explaining specifically with reference to the drawings, FIG. 3 shows a state in which the laminated materials are overlapped such that the unstretched thermoplastic resin layer is on the inner surface.
The surface is a stretched synthetic resin material 21. Peripheral part 22
a and 22b are overlapped with each other and the periphery thereof is heat-sealed to define a storage section 23 for the packaged object at the center. FIG. 4 shows a packaging bag made into a bag. In the figure, a hatched portion 24 is a heat seal portion, and an opening notch 25 is provided in a part of the heat seal portion. In this packaging bag, when the packaging bag is opened, it is easily torn with a finger from the notch 25 in the direction indicated by the dotted line in the figure, particularly under the action of the coating layers 3 and 14, so that the packaging bag can be smoothly opened. Can be. By the way, the filling and packing of the packaged object into the storage portion 23 of the packaging bag is performed by setting one side portion of the packaging bag as an opening, and completing the heat sealing after filling the packaged material into the storage portion 23. It can be carried out.

[0020]

Next, the present invention will be described with reference to Examples and Comparative Examples.
Explain physically. However, the present invention is based on Examples and the like.
There is no restriction. Note that the laminated material is easily torn.
The property was evaluated by the following tear strength measurement method.Method for measuring tear strength  As shown in FIG. 5, a test with a width of 50 mm and a length of 100 mm
A linear slit of 50 mm in length is placed at one end in the center in the width direction.
And put it up and down as shown in FIG.
Maximum tensile load when the test piece is torn and cut at mm / min
The weight (mN) is measured and defined as the tensile strength.

Example 1 Under the laminated structure shown in FIG. 1, the following coating agent was applied to the laminated surface 2 of a biaxially stretched polyethylene terephthalate film substrate 1 having a thickness of 12 μm using a bar coater.
Drying was performed at 0 ° C. to form a coat layer 3 having a thickness of 2 μm. Next, a polyurethane resin-based anchor coat layer (not shown) was applied to the coat layer 3 and dried. A polyethylene layer 4 having a thickness of 40 μm was laminated on the anchor coat layer by a melt extrusion method to obtain a laminated laminated film (A) having easy tearability. When the tear strength of this packaging laminated film (A) was determined by the above-described measurement method, the result was a maximum tensile load of 294 mN. As the coating agent, a coating component having the following composition (KIM Coat 00
5: A mixture of 100 parts by weight of Dainichi Seika Kogyo Co., Ltd., about 30 parts by weight of a mixed solvent of methyl ethyl ketone / toluene and 3 parts by weight of a KIM additive was used.

Comparative Example 1 A laminated film (a) for packaging was obtained in the same manner as in Example 1 except that the coat layer was not laminated (see FIG. 7). The maximum tensile load of the film (a) measured by the tear strength was 392 mN.

Example 2 Under the laminated structure shown in FIG. 2, silica was deposited on a biaxially stretched polyethylene terephthalate film substrate 11 having a thickness of 12 μm to form a silica thin film layer 13 having a thickness of 0.03 μm.
The coating agent used in Example 1 was applied on the silica thin film layer 13 using a bar coater to form a coat layer 14, dried at 70 ° C., and then thickened in the same manner as in Example 1. The polyethylene layer 15 having a thickness of 40 μm was laminated to obtain a laminated film (B) for packaging. When the tear strength of this film (B) was measured, the maximum tensile load was 68%.
6 mN.

Comparative Example 2 A laminated film (b) for packaging was obtained in the same manner as in Example 2 except that no coat layer was provided (see FIG. 8).
The tear strength was a maximum tensile load of 4900 mN.

Example 3 In place of silica-deposited PET (biaxially stretched polyethylene terephthalate film), alumina-deposited P having a thickness of 0.03 μm was used.
A laminated film for packaging was obtained in the same manner as in Example 2 except that ET was used. When the tear strength was measured, the maximum tensile load was 686 mN.

Comparative Example 3 A laminated film for packaging was obtained in the same manner as in Example 3 except that no coat layer was provided. The maximum tear strength of this film was 4900 mN.

The measurement results of the maximum tear strength of the laminated materials of Examples 1 to 3 and Comparative Examples 1 to 3 are summarized in Table 1 below.
The table also shows the measurement results of Examples and Comparative Examples in which a biaxially stretched nylon film was used instead of the biaxially stretched polyethylene terephthalate film.

[0028]

[Table 1]

From the above Examples and Comparative Examples, it can be seen that the laminated film for packaging provided with a coat layer has remarkably improved tear resistance. Incidentally, Example 1 when a biaxially stretched polyethylene terephthalate film was used as a substrate
The adhesive strength of the polyethylene layer as the sealant layer was T for each of the packaging laminated films of Examples 1 to 3 and Comparative Examples 1 to 3 and Comparative Examples 1 to 3 when a biaxially stretched nylon film was used. Table 2 shows the results as measured by a mold release test. here,
The test piece had the dimensions shown in FIG. 9, the tensile speed was 50 mm / min, and the load (mN) at which the substrate layer side or the polyethylene layer was broken was defined as the adhesive strength.

[0030]

[Table 2]

[0031]

As described above, according to the present invention, in a packaging laminate material comprising a base made of a stretched synthetic resin material and a non-stretched synthetic resin material, By disposing the coat layer on the packaging material, it is possible to provide a packaging laminate material that can easily open the packaging bag in a desired tear direction with a small force. In addition, such a laminated material can be produced on a substrate by a simple method of directly or indirectly forming a coat layer, and further, by using the laminated material, excellent openability can be obtained. A packaging bag can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a packaging laminate material of the present invention.

FIG. 2 is a schematic view showing another embodiment of the packaging laminate material of the present invention.

FIG. 3 is a view showing a process of producing the packaging bag of the present invention.

FIG. 4 is a diagram showing a packaging bag after the contents are filled according to the present invention.

FIG. 5 is a view showing a test piece used in a tear strength measurement test.

FIG. 6 is a diagram showing a test state of a test piece used in a tear strength measurement test.

FIG. 7 is a schematic view of a conventional packaging laminate material shown in Comparative Example 1.

FIG. 8 is a schematic diagram of a conventional packaging laminate material shown in Comparative Example 2.

FIG. 9 is a perspective view showing a test piece of a T-type peel test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Biaxially stretched polyethylene terephthalate base material layer 2, 12 Lamination surface 3, 14 Coat layer 4, 15 Low-density polyethylene layer 13 Silica vapor deposition layer 21 Stretched synthetic resin material 22a, 22b Peripheral part 23 Storage part 24 Heat seal Part 25 notch

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 65/40 B65D 65/40 D 65/42 65/42 C // B29K 101: 12 B29K 101: 12 B29L 9:00 B29L 9:00 F term (reference) 3E064 AA04 BA17 BA27 BA29 BA30 BA35 BA36 BA37 BA38 BA55 BA60 BB03 BC18 FA04 FA05 GA02 HN06 HP01 HP05 3E086 AA23 AC15 AD01 BA04 BA15 BA24 BA33 BA40 BB90 CA01 4F100 AA17A AAAAAAAAB AK04 AK42 AK48 AK51C BA03 BA04 BA05 BA07 BA10A BA10B BA10D BA10E EH17 EH172 EH46 EH461 EH66 EH661 EJ37A EJ37B EJ38 GB15 GB23 JB16A JB16B 4F211 AA04 AA21 AAA24 A02 THN TN04 A02T

Claims (6)

[Claims] 1. A packaging laminated material comprising at least two layers of synthetic resin material including a substrate made of a stretched synthetic resin material, wherein the packaging material is provided directly or indirectly on the laminating surface side of the substrate. An easily tearable laminated material for packaging, comprising a coating layer disposed thereon. 2. The laminated material for easily tearable packaging according to claim 1, wherein the coat layer is a film containing an acrylic polyol resin and a polyurethane resin. 3. At least one layer of the synthetic resin material,
3. The laminated material for easily tearable packaging according to claim 1, which is a non-stretched thermoplastic resin material. 4. The laminated material for easily tearable packaging according to claim 1, wherein a metal oxide thin film layer is laminated on the base material. 5. The method for producing a laminated material for packaging according to claim 1, wherein a coating agent is applied directly or indirectly to a laminated surface of a substrate made of a stretched synthetic resin material and dried. Forming a coat layer on the base material, and then laminating a thermoplastic synthetic resin layer on the coat layer. 6. A laminate material for packaging according to claim 1, wherein the thermoplastic resin layer side is an inner surface, and the thermoplastic resin is heat-sealed at a peripheral portion of the laminate material. An easy-opening packaging bag, characterized in that a storage portion is formed by the above and a notch or a slit is provided in the heat-sealed portion.