JP2005161537A - Packaging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a papckaging material excellent in steam barrier properties or shading properties and having easy cutting properties, and a packaging bag manufactured using it. <P>SOLUTION: This packaging material is constituted by laminating a base material layer (11) and a polyethylene layer (12) through an adhesive layer (13). The polyethylene layer comprises a C<SB>4</SB>three-layered constitution with a density of 0.920-0.925 g/cm<SP>3</SP>from the adhesive layer side and the innermost layer (121) or the intermediate layer (122) being the second layer inside the innermost layer comprises a color layer containing 1-20% of a white colorant. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packaging material, and in particular, relates to a packaging material having light shielding properties, easy cut properties, and water vapor barrier properties.

  Foods containing fats and oils such as snacks, chocolate, peanuts and fried foods (hereinafter referred to as oil-based foods) are easily oxidized, and the oxidation is accelerated by the effect of light. For example, a packaging material using an aluminum foil excellent in oxygen barrier property and light shielding property or a plastic film on which an aluminum thin film is deposited is used.

  The packaging material using the aluminum foil has the above-mentioned advantages, but has a drawback that it is difficult to incinerate when it is discarded after use. Moreover, since the amount of aluminum used in the aluminum vapor-deposited plastic film is very small, there is no problem in disposal, but there is a problem that the appearance is difficult to distinguish from the aluminum foil.

  On the other hand, packaging materials that do not use plastic films deposited with aluminum foil or aluminum thin film do not have a problem during disposal, but they have poor oxygen barrier properties and are not light-shielding. The oil is easily oxidized under the influence of light and cannot be used as it is. In some cases, polyvinylidene chloride (PVDC) film, PVDC coating film, or saponified ethylene / vinyl acetate copolymer film is used as oxygen barrier packaging material, but generation of chlorine gas during incineration In addition, there are problems such as deterioration of oxygen barrier properties under high temperature environment.

Then, the further proposal was made | formed as a packaging material which has oxygen barrier property and light-shielding property instead of the packaging material using an aluminum foil or an aluminum thin film vapor deposition plastic film (for example, refer patent document 1).
In the invention described in Japanese Patent Application Laid-Open No. 9-314719, oxygen barrier properties and light-shielding properties are good, but easy cutting properties are not taken into consideration. In such a case, there is a problem that a film cutting tool such as a bag is required because the ease of opening is inferior to open the packaging bag.

  The present invention was made in order to solve the above-described problems relating to packaging materials that do not use aluminum foil or aluminum thin film-deposited plastic films for packaging oily foods and the like, and packaging bags made using the same. Another object of the present invention is to provide a packaging material that is excellent in water vapor barrier properties and light shielding properties and has easy-cut properties, and a packaging bag produced using the packaging material.

The invention of claim 1 of the present invention is a packaging material in which a base material layer and a polyethylene layer are laminated via an adhesive layer, and the polyethylene layer has a density of 0.920 to 0.925 g / cm ³ . a three-layer structure of linear low-density polyethylene C ₄ (L-LDPE), the innermost layer of the adhesive layer side or, an intermediate layer of the inner, contains white colorant is 1-20% It is a packaging material characterized by consisting of a colored layer.

Thus, according to the first aspect of the present invention, the polyethylene layer has a three-layer structure of C ₄ L-LDPE having a density of 0.920 to 0.925 g / cm ³ , and is the innermost layer on the adhesive layer side. Alternatively, since the inner intermediate layer is a colored layer containing 1 to 20% of a white colorant, the intermediate layer is a packaging material having light shielding properties and easy cutting properties and excellent water vapor barrier properties.

The invention according to claim 2 is the invention according to claim 1, wherein the polyethylene layer has a layer thickness ratio of three layers of a C ₄ L-LDPE layer having a density of 0.920 to 0.925 g / cm ^3. It is a packaging material characterized by being 14-46 / 8-72 / 14-46.

Thus, according to the invention of claim 2, the layer thickness ratio of the three layers of the C ₄ L-LDPE layer having a density of 0.920 to 0.925 g / cm ³ which is a polyethylene layer is 14 to 46 /. Since it is set to 8-72 / 14-46, the finished packaging material has moderate easy cut property.

  A third aspect of the present invention is the packaging material according to the first or second aspect, wherein the polyethylene layer has a thickness of 30 to 300 μm.

  Thus, according to invention of Claim 3, since the thickness of the polyethylene layer was 30-300 micrometers, it becomes possible to produce from a small capacity packaging bag to a large capacity packaging bag.

  Moreover, invention of Claim 4 is the packaging bag produced using the packaging material of any one of Claims 1-3.

  Thus, by using the packaging material of the present invention, it can be used as a packaging material for packaging oily food without using an aluminum foil or a plastic film on which an aluminum thin film is deposited.

  The packaging material of the present invention will be described in detail below based on one embodiment.

  The packaging material of the present invention is, for example, a packaging material (10) in which a base material layer (11) and a polyethylene layer (12) are laminated via an adhesive layer (13) as shown in FIG.

The polyethylene layer (12) has a three-layer configuration of C ₄ L-LDPE having a density of 0.920 to 0.925 g / cm ³ , and is the innermost layer (121) on the adhesive layer side or the inner side thereof. The layer (122) is composed of a colored layer containing 1 to 20% of a white colorant.

  As the base material layer (11), a single film such as a polyethylene terephthalate (PET) film, a polyamide (Ny) film, an oriented polypropylene (OPP), or a composite film made of these plastic films can be preferably used.

The layer thickness ratio of the innermost layer, the intermediate layer and the outermost layer of C ₄ L-LDPE having a density of 0.920 to 0.925 g / cm ³ constituting the polyethylene layer (12) is 14 to 46/8 to 72 / It is preferable to set it as 14-46, and it is preferable that the thickness of a polyethylene layer shall be 30-300 micrometers.

  As the white colorant contained in the innermost layer (121) or the inner layer (122) of the polyethylene layer (12) in an amount of 1 to 20%, titanium white having excellent light shielding properties is preferable.

Since the polyethylene layer (12) is provided with a C ₄ L-LDPE layer (121) excellent in easy cutting properties and a white colored layer having light shielding properties in one or more layers, it has barrier properties, light shielding properties, and easy cutting properties. It can be set as the packaging material (10) which has.

  In addition, you may use suitably additives, such as antioxidant, a lubricant agent, and an antiblocking agent, for a polyethylene layer (12) as needed.

As a method of laminating the base material layer (11) and the polyethylene layer (12), a three-layer coextruded film as the polyethylene layer (12) is formed by T-die casting or inflation, and then the base material layer (11). And a method of dry laminating via a urethane resin adhesive, or after forming the intermediate layer (122) and the outermost layer (123) as a two-layer coextruded film, the base material layer (11) and the urethane resin system A general method may be a method in which an adhesive is used as an anchor coating agent and a C ₄ L-LDPE layer (121) is interposed and bonded by a melt extrusion lamination method.

  Packaging bags such as two-side seal bags, three-side seal bags, and standing pouches made using the packaging material thus produced have excellent barrier properties and light shielding properties, and have easy-cut properties. .

Hereinafter, the present invention will be described in detail by way of examples.
<Example 1>
A Ny film having a thickness of 15 μm was prepared as a base material layer (11).

L-LDPE layer in the C ₄ Density 0.925g / cm ³ as the first layer is the innermost layer (121), the density was 4% kneaded master batch if the titanium white as the second layer is an intermediate layer 0.925g L-LDPE layer / cm ³ (122), the coextruded film is a polyethylene layer L-LDPE layer of C ₄ (123) are sequentially laminated the density 0.925 g / cm ³ as the third layer (12) It was prepared by the inflation method. The thickness of each of the first layer, the second layer, the third layer, and each layer was 40 μm.

The base layer (11) and the first layer of the polyethylene layer (12) are opposed to each other and bonded together by a dry laminating method using a urethane resin adhesive (13), and an Ny film (15 μm) (11) / adhesive layer (13) / C ₄ of L-LDPE layer (40μm) (121) / white master batch 4% kneaded density 0.925g / cm ³ of L-LDPE layer (40μm) (122) / density 0.925g A packaging material of Example 1 having a layer configuration of / cm ³ C ₄ L-LDPE layer (40 μm) (123) was produced.
<Example 2>
Using the same material and method as in Example 1 except that L-LDPE layers having a density of 0.910 g / cm ³ were used for the first layer, the second layer, and the third layer of the polyethylene layer (12), a Ny film (15 [mu] m) (11) / adhesive layer (13) / density 0.910 g / C ₄ of L-LDPE layer in cm ³ (40 [mu] m) / white density master batch was 4% kneaded 0.910 g / cm ³ of L -LDPE layer (40 [mu] m) / packaging material of example 2 having a layer structure of the L-LDPE layer in the C ₄ density 0.910g / cm ³ (40μm) was produced.
<Example 3>
The same material and method as in Example 1 were used except that the polyethylene layer (12) used was a C ₄ L-LDPE layer having a density of 0.925 g / cm ³ for the first layer, the second layer, and the third layer. Ny film (15 μm) (11) / adhesive layer (13) / density 0.925 g / cm ³ C ₄ L-LDPE layer (40 μm) / density 0.925 g / cm ³ C ₄ L-LDPE Layer (40μm) /
A packaging material of Example 3 having a layer configuration of a C ₄ L-LDPE layer (40 μm) having a density of 0.925 g / cm ³ was produced.

  About one kind of Example of this invention produced in this way, Example 2 which is a conventional example, a total of three kinds of packaging materials and the packaging bags produced from the packaging materials, its light shielding property, water vapor barrier property, easy cut The properties were measured and observed by the following methods. The results are shown in Table 1.

Light-shielding property compliant with JIS K7105, using haze meter
○: 10% or more
×: Less than 10% Water vapor barrier property Measured in an atmosphere of 40 ° C and 90% RH using a water vapor permeability measuring device (MOCON PERMATRAN W6) manufactured by Modern Control.
○: Less than 3 g / m ² / day
×: 3 g / m ² / day or more Easy cut compliant with JIS K7128
○: Less than 1 N / mm
×: 1 N / mm or more

表１に示すように、実施例１の包装材料（包装袋）は遮光性、水蒸気バリア性に優れるとともに易カット性を有していることが分かる。

As shown in Table 1, it can be seen that the packaging material (packaging bag) of Example 1 has excellent light-shielding properties and water vapor barrier properties and has easy-cutting properties.

It is sectional explanatory drawing which shows one Example of the packaging material which has the light-shielding property of this invention, and easy cut property. It is plane explanatory drawing which shows one Example of the packaging bag produced using the packaging material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Packaging material 11 Base material layer 12 Polyethylene layer 121 First layer 122 Second layer 123 Third layer 13 Adhesive layer 20 Packaging bag

Claims (4)

A packaging material in which a base material layer and a polyethylene layer are laminated via an adhesive layer,
The polyethylene layer has a three-layer structure of C ₄ linear low-density polyethylene having a density of 0.920 to 0.925 g / cm ³ , and the innermost layer on the adhesive layer side or the inner intermediate layer is A packaging material comprising a colored layer containing 1 to 20% of a white colorant. The layer thickness ratio of three layers of the C ₄ linear low-density polyethylene layer having a density of 0.920 to 0.925 g / cm ³ , which is the polyethylene layer, is 14 to 46/8 to 72 from the adhesive layer side. It is / 14-46, The packaging material of Claim 1 characterized by the above-mentioned.   The packaging material according to claim 1, wherein the polyethylene layer has a thickness of 30 to 300 μm. The packaging bag produced using the packaging material of any one of Claims 1-3.

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