JP4499674B2 - Laminated material for easy tear packaging, method for producing the same, and packaging bag using the same - Google Patents

Description

  The present invention relates to a laminate material for easy tear packaging, a method for producing the same, and a packaging bag using the same, and more specifically, liquids and pastes such as soy sauce, hot peppers, miso, etc., solids, powders The present invention relates to a synthetic resin laminated material that can be easily opened when taking out the contents, a manufacturing method thereof, and an easily openable packaging bag using the same.

  Conventionally, packaging using a synthetic resin film as a packaging material has been widely performed for foodstuffs, seasonings, etc. For example, for the inclusion of liquid or kneaded seasonings such as soy sauce, sauces, and peppers, A packaging bag obtained by forming a 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 excellent in strength, hardness, transparency and the like is known. ing. In a packaging bag, the contents are enclosed in a bag formed by heat-sealing the peripheral portion of such a packaging laminate film and thermally fusing 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, the V-shaped opening notch or linear slit provided in the heat seal portion of the packaging bag is used as a starting point to tear and open with a fingertip. Removal is performed by extruding the contents from the opened packaging bag.
However, for example, a packaging laminate film in which a biaxially stretched polyethylene terephthalate film is used as a stretched thermoplastic synthetic resin material, and polyethylene is laminated on the stretched thermoplastic synthetic resin material, The tear resistance is remarkably increased, and as a result, there is a problem that the entire bag cannot be opened, and there is a problem that the direction of tearing cannot be determined even when the bag is forcibly torn.

Therefore, various proposals have been made for improving the easy tearability of the packaging synthetic resin film and the easy opening of the packaging bag. For example, according to Japanese Patent Laid-Open No. 5-42951, a plastic film bag is proposed. In a bag made of a packaging material in which a heat-adhesive resin is laminated on the inner surface, a weakened area composed of linear irregularities in a direction perpendicular to the outer edge is provided in a bag made of a packaging material in which a heat adhesive resin is laminated on the inner surface. Easy-open bags have been proposed.
However, this proposed technique is related to the improvement of the notch or slit, and has not yet solved the above-mentioned problems. Moreover, the manufacturing process is complicated, and the manufacturing is simple and easy to open. The development of bags has been eagerly desired.

Accordingly, an object of the present invention is a packaging laminate material in which a stretched synthetic resin material is used as a base material for a packaging laminate material, and an unstretched thermoplastic synthetic resin material is laminated on the laminate. An object of the present invention is to provide a laminated material for packaging in which easy tearability is maintained, and an easy-open packaging bag using the same.
Furthermore, the subject of this invention is providing the manufacturing method of the laminate material for easy-open packaging formed by laminating | stacking the stretched synthetic resin material and the non-stretched thermoplastic synthetic resin material.

  Therefore, as a result of repeated studies to solve the above problems, the present inventors have provided a coating layer between the laminated layers in a packaging laminated material constituted by laminating at least two layers of synthetic resin materials. It was conceived that easy tearability can be improved and that a packaging bag that can be easily opened can be provided by using the laminated material, and the present invention has been completed based on these findings.

That is, the first of the present invention is a base material composed of a stretched synthetic resin material and a low-density polyethylene layer, a linear low-density polyethylene layer, a polypropylene layer, an ethylene- It is in a laminated material for packaging in which at least two layers of synthetic resin materials including a vinyl acetate copolymer layer or a polyvinylidene chloride layer are laminated, and an acrylic polyol resin and a polyurethane resin are contained on the laminated surface side of the base material A coat layer having a thickness of 0.3 μm to 5 μm made of a coating film is disposed directly or indirectly, and a polyurethane resin anchor coat layer is formed over the coat layer. is there.

The second of the present invention is a base material made of a stretched synthetic resin material, and a low-density polyethylene layer, a linear low-density polyethylene layer, a polypropylene layer, an ethylene- At least two layers of a synthetic resin material including a vinyl acetate copolymer layer or a polyvinylidene chloride layer are laminated, and a coating layer is disposed directly or indirectly on the laminated surface side of the substrate. In a method for producing a laminated material for packaging, a coating agent comprising a solution containing an acrylic polyol resin, a polyurethane resin and an antiblocking agent is directly or indirectly applied to the laminated surface of a base material made of a stretched synthetic resin material. by applying and drying to form a coating layer on a substrate, then forming a polyurethane-based anchor coating layer, and thereafter, the a Is characterized in that the car coating layer laminating the thermoplastic synthetic resin layer.

Further, the third aspect of the present invention is a base material composed of a stretched synthetic resin material, and a low-density polyethylene layer, a linear low-density polyethylene layer, a polypropylene layer, an ethylene- A synthetic resin material of at least two layers including a vinyl acetate copolymer layer or a polyvinylidene chloride layer is laminated, and a layer containing an acrylic polyol resin and a polyurethane resin is formed on the laminated surface side of the substrate. An easy-open packaging bag using a packaging laminate formed by directly or indirectly forming a coat layer having a thickness of 3 μm to 5 μm and forming a polyurethane resin anchor coat layer on the coat layer The laminated material is laminated so that the thermoplastic synthetic resin layer becomes the inner surface, and the thermoplastic synthetic resin layer is heat-sealed at the peripheral edge of the laminated material. Thus, a storage portion is formed, and a notch or a slit is provided in the heat fusion portion.

As described above, according to the present invention, in a packaging laminated material comprising a base material made of a stretched synthetic resin material and a non-stretched thermoplastic synthetic resin material, an acrylic polyol is provided on the laminate surface side of the base material. By providing a coating layer having a thickness of 0.3 μm to 5 μm composed of a film containing a resin and a polyurethane resin, a packaging laminate material that can be easily opened in any tearing direction with a small force with a small force Can be provided. In addition, such a laminated material can be produced by a simple method of forming a coating layer directly or indirectly on a substrate, and further, by using the laminated material, the opening property is excellent. Packaging bags can be provided.

  The laminate material for easy-open packaging of the present invention is formed by laminating at least two layers of synthetic resin material, and a single layer of the base material made of the stretched synthetic resin material, and the laminated surface of the base material It is composed of a coat layer having a thickness of 0.3 μm to 5 μm made of a coating containing an acrylic polyol resin and a polyurethane resin, and at least one thermoplastic synthetic resin layer disposed on the side (laminate surface side). is there. Furthermore, a laminated material in which a metal oxide thin film layer is laminated on any one surface of the substrate, more preferably on the surface on the lamination side, is selected as a preferred embodiment.

  As the stretched synthetic resin material of the component of the packaging laminate material of the present invention, either a uniaxially stretched or biaxially stretched synthetic resin film can be used. For example, polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate, polyolefin films such as polyethylene film and polypropylene film, polyamide film, polystyrene film, polyvinyl chloride film, polycarbonate film, polyacrylonitrile film, ethylene -A biaxially stretched film such as a vinyl alcohol copolymer film can be mentioned. In particular, a biaxially stretched polyethylene terephthalate film, a biaxially stretched polypropylene, a biaxially stretched nylon or the like is preferable as the base material of the packaging laminate material. Although the thickness of a base material is arbitrarily selected by various uses, Usually 3 micrometers-200 micrometers, Preferably the thing of 10 micrometers-30 micrometers is employ | adopted.

Moreover, as a metal oxide thin film layer used as the element of the layer structure of the packaging laminated material of this invention, an aluminum oxide layer, a silicon oxide layer, a magnesium oxide layer, etc. 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 according to the type of metal oxide, the layer configuration, etc., but is usually 400 to 3000 mm, preferably The thing of the range of 500 to 1000cm is used.
The method for forming the metal oxide thin film layer is not particularly limited, and a commonly used vacuum vapor deposition method such as a laser vapor deposition method or a flash vapor deposition 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 base material, a transparent vapor deposition base material can be obtained. Specific examples include alumina-deposited polyethylene terephthalate or nylon, or silica-deposited polyethylene terephthalate or nylon, and commercially available products may be obtained and used.

Although it does not specifically limit as a thermoplastic synthetic resin material which comprises the laminated material for packaging of this invention, An unstretched thermoplastic resin layer can be used. Examples thereof include olefin polymer layers such as low density polyethylene layers, linear low density polyethylene layers, and polypropylene layers, ethylene-vinyl acetate copolymer layers, and polyvinylidene chloride layers. These thermoplastic resin materials preferably function as a sealant layer.
The thickness of the thermoplastic synthetic resin material is not particularly limited and may be appropriately selected depending on the intended use, but is usually 15 to 200 μm, preferably 15 to 100 μm.

Next, the coat layer which is the main element of the layer structure of the easily tearable laminated material for packaging according to the present invention will be described.
The coat layer is composed of an acrylic polyol resin and a polyurethane resin.
The said coating layer is arrange | positioned by the laminated surface side with the thermoplastic resin material of the base material which consists of the stretched synthetic resin which comprises a laminated material. The coat layer is particularly preferably formed on the laminated surface of the base material, but may be formed on the laminated surface side of the thermoplastic resin material laminated on the base material. Moreover, about the base material which laminated | stacked the metal oxide thin film layer, you may form a coating layer in any of this metal oxide thin film layer side or a base material side.
The thickness of the coating layer is preferably in the range of 0.3 μm to 5 μm, particularly 0.5 μm to 3 μm. When the thickness of the coat layer is less than 0.3 μm, the easy tearability is not sufficient. On the other hand, even if the thickness is 5 μm or more, an effect commensurate with the increase cannot be obtained.

The packaging laminate material of the present invention includes a variety of embodiments, and as a particularly preferred packaging laminate material, specifically,
(1) A base material composed of a stretched synthetic resin film, a laminate layer for packaging composed of a coating layer and a non-stretched thermoplastic synthetic resin layer sequentially laminated thereon,
(2) a base material composed of a stretched synthetic resin film, a metal oxide thin film layer sequentially laminated thereon, a coating laminated material composed of a coating layer and an unstretched thermoplastic synthetic resin layer, and
(3) A laminated material for packaging composed of a metal oxide thin film layer, a stretched synthetic resin film, a coat layer, and an unstretched thermoplastic synthetic resin layer in the order of lamination, and the like.

An embodiment of a laminated material for packaging according to the present invention is schematically shown in FIGS. A laminate material A shown in FIG. 1 is obtained by providing a coat layer 3 on the laminate surface 2 of a biaxially stretched polyethylene terephthalate substrate layer 1 and laminating a low density polyethylene layer 4 as a sealant layer on the coat 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 laminated surface 12 side of the biaxially stretched polyethylene terephthalate base material layer 11, and the silica vapor deposition layer 13 is coated with a coating layer. 14 and a low-density polyethylene layer 15 are sequentially laminated.

Next, the manufacturing method of the laminated material for packaging according to the present invention will be described. The manufacturing method includes the following steps (a) to (c): (a) a base material made of a stretched synthetic resin material or , A step of applying a coating agent to the laminated surface of the base material on which the metal oxide is deposited and laminated,
(B) a step of heat-drying the coating layer coated on the base material obtained in the step (a), and (c) the base material heat-dried in the step (b). It consists of a step of laminating an unstretched thermoplastic synthetic resin layer on the coated coat layer.
In addition, a printing layer can be formed between the surface of the said coating layer of a said base material, or a base material and a coating layer as needed.

As a coating method of the coating agent in the manufacturing method, for example, a method of applying a solution containing acrylic polyol resin, polyurethane resin, and silicon dioxide as an antiblocking agent can be employed. That is, such a coating agent composition is obtained by dissolving acrylic polyol resin, polyurethane resin and silicon dioxide, specifically finely divided silica, as a coating layer forming component, and dissolving them in an organic solvent of ketone and aromatic hydrocarbon. A solution is used.
The blending amount of each component is 10 to 20% by weight, preferably 15 to 17% by weight, 5 to 15% by weight, preferably 8 to 11% by weight of polyurethane resin, and 1 to 10% by weight of silicon dioxide based on the total weight of the coating agent. It can be employed in the range of 5% by weight, preferably 2-3% by weight. As the organic solvent ketone, 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 ketone and aromatic hydrocarbon is preferable, and it is preferably used in a ratio of 30 to 100 parts by weight, particularly 30 to 70 parts by weight, based on 100 parts by weight of the coating agent. The lamination of the thermoplastic resin material in the step (c) can employ a normal laminating method. For example, extrusion lamination, glue lamination, etc. may be selected.

In the packaging bag of the present invention, the laminated material for packaging is overlaid so that the thermoplastic synthetic resin layer thereof is the inner surface, and the peripheral edge of the laminated material is heat-sealed to heat-melt the thermoplastic synthetic resin layer. A storage part is formed by attaching, and a notch or a slit is provided in the heat-sealed part, and hence the heat seal part.
More specifically, FIG. 3 shows a synthetic resin material 21 having a stretched surface, showing a state in which a laminated material is superposed so that an unstretched thermoplastic resin layer becomes an inner surface. The peripheral portions 22a and 22b are overlapped and the peripheral portions thereof are heat-sealed, thereby partitioning the storage portion 23 of the packaged object in the central portion.
FIG. 4 shows a packaged bag. In the figure, the shaded portion 24 is a heat seal portion, and an opening notch 25 is provided in a part of the heat seal portion.
When opening the packaging bag, it should be easily opened with the fingers in the direction indicated by the dotted line in the figure from the notch 25 under the action of the coating layers 3 and 14, and smoothly opened over the entire packaging bag. Can do.
By the way, filling and packaging of an article to be packaged into the storage part 23 of the packaging bag leaves one side part of the packaging bag as an opening, and completes the heat sealing after filling the article to be packed into the accommodation part 23. It can be carried out.

Next, the present invention will be specifically described with reference to examples and comparative examples. However, the present invention is not limited to the examples.
The easy tearability of the laminated material was evaluated by the following tear strength measurement method.
Method for Measuring Tear Strength As shown in FIG. 5, a 50 mm long × 100 mm long test piece is provided with a straight slit having a length of 50 mm at one central end in the width direction, and as shown in FIG. The maximum tensile load (mN) when the test piece is torn and divided at 200 mm / min is measured to obtain the tensile strength.

Example 1
Under the laminated structure shown in FIG. 1, the following coating agent is applied to the laminated surface 2 of the biaxially stretched polyethylene terephthalate film substrate 1 having a thickness of 12 μm using a bar coater, dried at 70 ° C., and coated with a thickness of 2 μm. Layer 3 was formed. Next, a polyurethane resin anchor coat layer (not shown) was applied to the coat layer 3 and dried. A 40 μm thick polyethylene layer 4 was laminated on the anchor coat layer by melt extrusion to obtain a laminated film for packaging (A) having easy tearability. When the tear strength of the laminated film for packaging (A) was determined by the above-described measurement method, a maximum tensile load of 294 mN was obtained.
As the coating agent, it was used a mixture of K IM coat 005 (Dainichiseika Color & Chemicals Mfg. Co., Ltd.) 100 parts by weight of methyl ethyl ketone / toluene mixed solvent to about 30 parts by weight KIM additive 3 parts by weight.

Comparative Example 1
A laminated film for packaging (a) 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, a silica thin film layer 13 having a thickness of 0.03 μm is formed by vapor-depositing silica on a biaxially stretched polyethylene terephthalate film substrate 11 having a thickness of 12 μm. The coating agent used in Example 1 was applied using a bar coater to form a coating layer 14, dried at 70 ° C., and then a polyethylene layer 15 having a thickness of 40 μm was formed in the same manner as in Example 1. By laminating, a laminated film for packaging (B) was obtained. When the tear strength of this film (B) was measured, the maximum tensile load was 686 mN.

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

Example 3
A laminated film for packaging was obtained in the same manner as in Example 2 except that alumina-deposited PET having a film thickness of 0.03 μm was used instead of silica-deposited PET (biaxially stretched polyethylene terephthalate film). 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 the coat layer was not provided. The maximum tear strength of this film was 4900 mN.

  The maximum tear strength measurement results of the laminated materials of Examples 1 to 3 and Comparative Examples 1 to 3 are summarized in Table 1 below. In addition, in the table | surface, it replaces with a biaxially-stretched polyethylene terephthalate film, and also shows the measurement result about the Example and comparative example at the time of using a biaxially-stretched nylon film.

From the above Examples and Comparative Examples, it can be seen that the packaging laminate film provided with the coating layer is remarkably improved in easy tearability.
Incidentally, Examples 1 to 3 and Comparative Examples 1 to 3 when using a biaxially stretched polyethylene terephthalate film as a substrate and Examples 1 to 3 and Comparative Examples 1 to 3 when using a biaxially stretched nylon film are used. For each laminated film for packaging, the adhesive strength of the polyethylene layer as the sealant layer was measured by a T-type peel test, and the results were as shown in Table 2.
Here, the test piece has the dimensions shown in FIG. 9, the tensile speed was 50 mm / min, and the load (mN) leading to the fracture of the base material layer side or the polyethylene layer was defined as the adhesive strength.

It is a schematic diagram which shows the embodiment of the laminated material for packaging of this invention. It is a schematic diagram which shows the other embodiment of the laminated material for packaging of this invention. It is a figure which shows the preparation process of the packaging bag of this invention. It is a figure which shows the packaging bag after the content filling of this invention. It is a figure which shows the test piece used in a tearing strength measurement test. It is a figure which shows the test state of the test piece used in a tearing strength measurement test. 5 is a schematic diagram of a conventional packaging laminate material shown in Comparative Example 1. FIG. 6 is a schematic view of a conventional packaging laminated material shown in Comparative Example 2. FIG. It is a perspective view which shows the test piece of a T-type peeling test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Biaxially-stretched polyethylene terephthalate base material layer 2,12 Laminated 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

Claims (4)

A base material composed of a stretched synthetic resin material, and a low-density polyethylene layer, a linear low-density polyethylene layer, a polypropylene layer, an ethylene-vinyl acetate copolymer layer or a polychlorinated material as an unstretched thermoplastic synthetic resin material A laminated material for packaging in which at least two layers of a synthetic resin material including a vinylidene layer are laminated, and the laminated surface side of the base material is formed of a film containing an acrylic polyol resin and a polyurethane resin. A laminate material for easy tearing, wherein a coating layer having a thickness of 5 μm is disposed directly or indirectly and a polyurethane resin anchor coating layer is formed on the coating layer . The laminate material for easy tear packaging according to claim 1, wherein a metal oxide thin film layer is laminated on the base material. It is a manufacturing method of the laminated material for packaging of Claim 1, Comprising: An acrylic polyol resin, a polyurethane resin, and an antiblocking agent are included directly or indirectly in the lamination surface of the base material which consists of an extended synthetic resin material. A coating agent made of a solution is applied and dried to form a coat layer on the substrate, and then a polyurethane resin-based anchor coat layer is formed. Thereafter, a thermoplastic synthetic resin layer is formed on the anchor coat layer. A method for producing a laminate material for easy tear packaging, characterized by laminating. The packaging laminated material according to claim 1 or 2 is overlapped so that the thermoplastic synthetic resin layer side is the inner surface, and the thermoplastic synthetic resin is heat-sealed at the peripheral edge of the laminated material, thereby the storage portion is formed. An easily openable packaging bag formed and provided with a notch or a slit in a heat fusion part.

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