JP2005161538A - Packaging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging 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 C<SB>4</SB>L-LDPE with a density of 0.920-0.925 g/cm<SP>3</SP>and is constituted by successively laminating three layers, that is, a first layer (121) containing 1-20% of a white colorant, the second layer (122) containing 1-20% of a black, gray or brown colorant and the third layer (123) being a transparent layer containing no colorant from the adhesive layer side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packaging material having light-shielding properties, easy cutting properties, and water vapor barrier properties, and a packaging bag produced using the packaging material.

  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 . C ₄ to consist linear low density polyethylene layer, the layer first layer surface comprising a white colorant 1-20% from the adhesive layer side, the second layer is a black or gray or brown coloring agent 1-20% The containing layer and the third layer are packaging materials characterized by comprising at least three transparent layers containing no colorant.

Thus, according to the first aspect of the present invention, the polyethylene layer comprises a C ₄ linear low density polyethylene (L-LDPE) layer having a density of 0.920 to 0.925 g / cm ³ , and an adhesive layer. From the side, the first layer surface is a layer containing 1 to 20% of a white colorant, the second layer is a layer containing 1 to 20% of a black, gray or brown colorant, and the third layer is a transparent material containing no colorant. Since it is composed of at least three layers, it can be a packaging material that is excellent in water vapor barrier properties and light shielding properties and has easy-cut properties.

  The invention of claim 2 is the invention of claim 1, wherein the white colorant is titanium white, and the black, gray or brown colorant is a carbon pigment or carbon pigment and titanium white, bengara, vermilion, iso It is a packaging material characterized by being any one of indolinone yellow, perylene red, or a mixture of two or more.

  Thus, according to the invention of claim 2, the white colorant is titanium white, and the black, gray, or brown colorant is carbon pigment or carbon pigment and titanium white, bengara, vermilion, isoindolinone yellow, Since it is either perylene red or a mixture of two or more, the finished packaging material can be a packaging material having an appropriate light shielding property.

The invention according to claim 3 is 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 as} the polyethylene layer according to the invention of claim 1 or 2. Is a packaging material characterized by being 14-46 / 8-72 / 14-46 from the adhesive layer side.

Thus, according to the invention described in claim 3, 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 determined from the adhesive layer side. Since it is set as 14-46 / 8-72 / 14-46, the finished packaging material has moderate easy cut property.

  The invention of claim 4 is the packaging material having light-shielding properties and easy-cut properties, characterized in that, in the invention of claim 1, 2, or 3, the thickness of the polyethylene layer is 30 to 300 μm.

  Thus, according to invention of Claim 4, 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 5 is the packaging bag produced using the packaging material of any one of Claims 1-4.

  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.

For example, as shown in FIG. 1, the packaging material of the present invention has a base material layer (via an adhesive layer (13)).
11) and a packaging material (10) in which a polyethylene layer (12) is laminated.

The polyethylene layer (12) is a C ₄ L-LDPE layer having a density of 0.920 to 0.925 g / cm ³ , and the first layer (121) from the adhesive layer side contains 1 white colorant. A layer containing ~ 20%, the second layer (122) is a layer containing 1 to 20% of a black, gray or brown colorant, and the third layer (123) is a transparent layer containing no colorant. It is comprised from.

  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 three layers of the polyethylene layer (12) made of C ₄ L-LDPE having a density of 0.920 to 0.925 g / cm ³ is 14 to 46 & / 8 to 72% /% from the adhesive layer side. It is preferable to set it as 14 to 46%, and it is preferable that the thickness of a polyethylene layer shall be 30 to 300 micrometers.

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

  In addition, as a black, gray, or brown colorant contained in the second layer (122) of the polyethylene layer, the carbon pigment or carbon pigment and titanium white, bengara, vermilion, isoindolinone yellow, It is preferable to use either beryllen red or a mixture of two or more.

As the polyethylene layer (12), using the L-LDPE of C ₄ which is excellent in easy cutting property, and density superior in water vapor barrier property is used L-LDPE in the C ₄ of 0.920~0.925g / cm ^3, In order to provide concealment, a white colored layer is provided on the first layer (121), and a black, gray or brown colored layer is provided on the second layer (122). It can be set as the packaging material (10) excellent in property.

  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), for example, 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 is preferable.

  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).

As a polyethylene layer (12), a C ₄ L-LDPE layer having a density of 0.923 g / cm ^{3 and} kneading 4% of a master batch from titanium white as a first layer (121), a second layer (
L-LDPE layer in the C ₄ Density 0.923 g / cm ³ was 44% kneading a master batch comprising carbon black as 122), the third layer (123) transparent density of 0.923 g / cm ³ of C ₄ A coextruded film in which L-LDPE layers were sequentially laminated was produced by an 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 (121) of the polyethylene layer 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 L-LDPE layer with a density of 0.923 g / cm ³ kneaded with 4% white masterbatch (121) / C ₄ with a density 0.923 g / cm ³ kneaded with 4% black masterbatch of produced L-LDPE layer (122) / transparent density 0.923 g / in cm ³ of C ₄ L-LDPE layer (123) the packaging material of example 1 having a layer structure of (10).
<Example 2>
Using the same material and method as in Example 1 except that a C ₄ L-LDPE having a density of 0.910 g / cm ³ was used as the base of the polyethylene layer, an Ny film (15 μm) ( 11) / adhesive layer (13) / white L-LDPE layer in the C ₄ kneading the density master batch 4% 0.910 g / cm ³ (40 [mu] m) / black master batch 4% kneaded density 0.910 g / A packaging material of Example 2 having a layer configuration of cm ³ C ₄ L-LDPE layer (40 μm) / transparent density 0.910 g / cm ³ C ₄ L-LDPE layer (40 μm) was produced.
<Example 3>
Using the same material and method as in Example 1 except that the L-LDPE agent used as the base of the polyethylene layer was C ₆ L-LDPE having a density of 0.923 g / cm ³ , a Ny film (15 μm) ( 11) / Adhesive layer (13) / A white masterbatch of 4% kneaded density 0.923 g / cm ³ C ₆ L-LDPE layer (40 μm) / Black masterbatch 4% kneaded density 0.923 g / A packaging material of Example 3 having a layer configuration of cm ³ C ₆ L-LDPE layer (40 μm) / transparent density 0.923 g / cm ³ C ₆ L-LDPE layer (40 μm) 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 cutability 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 (5)

A packaging material in which a base material layer and a polyethylene layer are laminated via an adhesive layer,
The polyethylene layer is a C ₄ linear low density polyethylene layer having a density of 0.920 to 0.925 g / cm ³ , and the first layer from the adhesive layer side contains 1 to 20% of a white colorant. A packaging material, wherein the second layer is a layer containing 1 to 20% of a black, gray or brown colorant, and the third layer is a transparent layer containing no colorant. .   The white colorant is titanium white, and the black, gray, or brown colorant is a carbon pigment or carbon pigment and titanium white, bengara, vermilion, isoindolinone yellow, perylene red, or a mixture of two or more. The packaging material according to claim 1, wherein: The thickness ratio of the three layers of the C ₄ linear low density polyethylene layer having a density of 0.920 to 0.925 g / cm ^{3 as} the polyethylene layer is 14 to 46/8 to 72 / from the adhesive layer side. It is 14-46, The packaging material which has light-shielding property and easy cut property of Claim 1 or 2.   The packaging material having light-shielding properties and easy-cutting properties 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 1-4.

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