JPH06246863A - Heat fusing packing material - Google Patents

Abstract

PURPOSE:To constitute a packing material so that excellent smell keeping properties and gas barrier properties of steam or oxygen are indicated even under a condition wherein it is transparent, and has a high temperature and high moisture. CONSTITUTION:A dry plating layer consisting inevitably of aluminum oxide is formed on at least one surface of a plastic film of a base. Vacuum metallizing, ion plating, spattering and plazma CVD are used as a forming method. Although a thickness of an aluminum oxide thin film is selected according to the thickness of a using film substrate and use of the film to be obtained finally, a range of 30Angstrom to 5000Angstrom is preferable. A thermally fusible coating agent is applied or printed on the dry plating layer.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is excellent in gas barrier properties against oxygen gas, carbon dioxide gas, etc., water vapor barrier properties, aroma retaining properties, flexibility, water resistance and chemical resistance, and can be used under various severe environments. Aluminum oxide is a useful aluminum oxide that is stable in performance, is clean to the environment in various situations in the field of packaging materials such as food and drink, pharmaceuticals, and luxury items, and has gas barrier properties and aroma retention properties. The present invention relates to a packaging material containing a dry plating layer which is essential.

[0002]

2. Description of the Related Art Plastic laminates used in the field of packaging materials such as foods and drinks, pharmaceuticals, favourites, and electronic parts have a gas permeability such as water vapor and oxygen in order to prevent deterioration of the contents in the package. The material of small is used. Further, recently, there is an increasing demand for safety of the global environment such as convenience in disposal and recycling. However, barrier films containing chlorine molecules, such as PVDC (polyvinylidene chloride), have gas barrier properties against oxygen, water vapor, etc., but due to the generation of chlorine ions during combustion, the generation of toxic substances or acid rain. The use of these films has recently become a hot issue. Further, polyvinyl alcohol films and polyvinyl alcohol films such as ethylene-vinyl alcohol copolymer films are also widely used as packaging materials because they have excellent oxygen barrier properties. When burned, these films do not generate toxic gases that harm the environment. However, the polyvinyl alcohol-based film is inferior in water vapor barrier property and further has a defect that the oxygen barrier property is deteriorated under the condition of high humidity.

In the case of a packaging material which requires a higher gas barrier property, a film having aluminum vapor-deposited on its surface has been used. However, although such a packaging material using metal vapor deposition has an excellent gas barrier property against water vapor and oxygen, it is opaque and cannot be used for applications requiring external observation of the contents.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides aluminum oxide on the surface of a plastic film so that it is transparent and has excellent aroma retaining property even under conditions of high temperature and high humidity and gas barrier properties such as water vapor and oxygen. Indicates
The present invention provides a packaging material that is not only excellent in acid resistance and alkali resistance, but does not release chlorine ions and the like even when incinerated and is clean to the environment. Further, by providing a heat-fusible coating agent on the dry plating layer by a usual coating or printing method, a packaging material which can be used as it is without being combined with other materials is provided.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a plastic film having at least one dry coating layer containing aluminum oxide as an essential component, which is coated or printed with a heat-fusible coating agent. It is a packaging material. In the present invention, the plastic film is not particularly limited, and polyethylene terephthalate, polybutylene terephthalate, polyethylene-
Films made of polyester such as 2,6-naphthalate, polyamide, polyimide, polyacrylonitrile, polycarbonate, polystyrene, polypropylene, saponified ethylene-vinyl acetate copolymer, polyvinyl alcohol, aromatic polyamide, and fluororesin,
Alternatively, there is a laminated film containing one or more of these, and may be uniaxially stretched or biaxially stretched. In general packaging applications, biaxially oriented polypropylene film, polyester film and the like are preferably used in terms of gloss and strength, and in the electronic material field, fluororesin film and polyester film are used. Also, in the case of producing by the winding method, the thickness of the plastic film is 5 to 100 from the viewpoint of preventing generation of wrinkles and cracks.
It is preferably μm.

The method of forming the laminate according to the present invention is as follows. First, a dry coating layer containing aluminum oxide as an essential component is formed on at least one surface of a plastic film as a base material. This dry coating layer imparts a gas barrier function such as oxygen and water vapor to the finally obtained film. The method for forming the dry coating layer containing aluminum oxide as an essential component on the plastic film is not particularly limited, and vacuum vapor deposition, ion plating, sputtering, plasma CVD or the like is used. Further, as an economical method, it is possible to use a method in which a metal aluminum layer is once provided on the plastic film by a method such as vacuum deposition, and then the metal aluminum layer is changed to an aluminum oxide layer by steam oxidation or oxidation treatment using an oxidizing agent. . The thickness of the aluminum oxide thin film is selected according to the thickness of the film substrate used and the purpose of use of the film finally obtained, but in the present invention, it is preferably in the range of 30Å to 5000Å, and preferably 200Å to 1000Å. desirable. Next, a thermal fusion coating agent is applied or printed on the dry coating layer containing aluminum oxide as an essential component.
As the heat-sealing coating agent, there are a heat-sealing adhesive agent, a heat-sealing coating agent and the like, and those having heat sealability and easy adhesion are used. These heat-sealing coating agents can be selected from water-based and oil-based in the situation of use, but it is preferable to select water-based from the environmental point of view. The resin for the heat-sealing coating agent is not particularly limited, but a polyester-based resin is preferable in consideration of recycling and combustion.

The coating amount of the heat fusion coating agent is not particularly limited, and there is no problem as long as it is within a commonly used range. As a method for applying the heat-sealing coating agent to the plastic film provided on the dry coating layer containing aluminum oxide as an essential component, gravure coating, reverse coating, spray coating and the like can be considered, but the methods are not limited to these. is not. Further, there is no problem as long as the coating speed and the drying means are within the normally used range. As the thickness of the heat-sealing coating agent,
It is usually 1 to 10 μm. As the packaging material of the present invention,
A plastic film provided with a heat-sealing coating agent in a dry plating layer containing aluminum oxide as an essential component,
Further, other films, adhesives and the like may be used together.

[0008]

The packaging material obtained according to the present invention comprises a plastic film provided with a dry coating layer containing aluminum oxide as an essential component, and a thermal fusion coating agent which is substantially composed of a polyester resin layer. It is a high barrier packaging material with a high degree of perfection that has no problems at the time of disposal, does not generate chlorine ions even when incinerated, has a gas barrier property against oxygen and water vapor, and has an aroma retaining property. This packaging material can be used for pouches, tray lid materials, general packaging such as gusset packaging and tobacco packaging. Further, there is an advantage that the functions such as improvement of barrier property and printing and adhesion with other film can be performed by one treatment. For example, when the plastic film used as the substrate has a heat seal on one side in advance, a barrier film having heat seal layers on both sides can be obtained by one-time application or printing. As a method for forming the heat-sealing layer previously provided on this substrate, coextrusion multilayer biaxial stretching may be used, or in-line or off-line coating before and after film stretching may be used. Furthermore, in the case of tobacco packaging materials, not only is the PVDC-coated polypropylene film conventionally used improved in flavor barrier performance such as L-menthol, but the amount of flavor components adsorbed to the resin is also small, so the tobacco flavor is improved. It can be stored for a long period of time without damage. In particular, when the heat seal layer on the inner surface of the bag is made of polyester, the amount of flavor component adsorbed on the resin can be reduced. Further, since the laminate is transparent, there is an advantage that printing on the bag is unnecessary.

[0009]

EXAMPLES The present invention will be described in more detail based on the examples of the present invention, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. The measurement of each characteristic in the examples is based on the following measuring methods. Oxygen gas permeability According to ASTM D-3985, it measured on the conditions of 25 degreeC and 100% RH (humidity) using the oxygen gas permeability meter (Modern Controls OXTRAN-100). Water vapor transmission rate According to ASTM F-1249, water vapor transmission rate measuring instrument (PERMATRAN-WT
WIN) was used under the conditions of 40 ° C. and 90% RH. Heat-sealing strength: 15 mm width, T-shaped peeling, 300 mm / min for the laminated body heat-sealed under the conditions of 120 ° C., 1 Kg / cm ² , and 1 second.
Was measured. The heat-sealing was performed on three points, that is, the heat-sealing layers of the base polyester, the heat-sealing layer of the base polyester and its opposite surface, and the opposite surfaces.

Example 1 12 μm thick biaxially stretched polyethylene terephthalate (P
Metallic aluminum was vacuum-deposited on the surface of the (ET) film by a high frequency induction heating method to form a thin film of metallic aluminum having a thickness of about 1000Å. Further, steam oxidation treatment was performed to form a vapor deposition layer as aluminum oxide. A heat-sealing heat-sealing agent THW-3287 (manufactured by Toyo Morton Co., Ltd.) was coated on both surfaces of the obtained vapor-deposited film by a wind-up type dry laminator at about 1 g / m ² (dry) and dried at 90 ° C. for 10 seconds. . As a result of measuring the oxygen gas permeability and the water vapor permeability of this packaging material by the methods described above, the oxygen gas permeability was 0.5 ml / m ² and the water vapor permeability was 0.5 g / m ² . Further, heat-sealing was performed for 1 second at 120 ° C. and 2 kg / cm ² with the vapor deposition surface side and the vapor deposition surface side of the above-mentioned laminate facing each other. About the laminate, 15mm width, T-shaped peeling, 300
As a result of measuring the heat seal strength by mm / min, 2
It was over 00 g.

Example 2 A thin film of about 1000 liters of aluminum oxide was formed on the non-treated surface of a biaxially stretched polyethylene terephthalate film having a thickness of 15 μm on one side by heat-sealing in the same manner as in Example 1. About 1 g / m ² (dry) of a heat-sealing heat-sealing agent THW-3287 (manufactured by Toyo Morton Co., Ltd.) was applied to the vapor-deposited layer side of the above vapor-deposited film by a winding type dry laminator and dried at 90 ° C. for 10 seconds. The body (Fig. 4) was created. As a result of measuring the oxygen gas permeability and the water vapor permeability of this laminate by the method described above, the oxygen gas permeability was 0.5.
ml / m ^2, the water vapor transmission rate was 0.5 g / m ^2. Further, the laminate was heat-sealed at 120 ° C. and 2 kg / cm ² for 1 second with the heat-sealed surface and the coated surface facing each other, and the heat-sealing strength was measured in the same manner as in Example 1. As a result, 200 g or more was measured. Indicated.

Example 3 After packaging a cigarette using the packaging material obtained in Example 1, the cigarette was stored in an environment of 40 ° C. and 80% together with a conventional packaged cigarette, and a change in aroma was examined by a sensory test. As a result, the rate of change in aroma was about half that of conventional packaging.

Claims (3)

[Claims] [Claims] 1. A packaging material comprising a plastic film having at least one dry plating layer containing aluminum oxide as an essential component, and a heat-fusible coating agent applied to or printed on the dry plating layer. 2. A plastic film having at least one dry coating layer containing aluminum oxide as an essential component, said dry coating layer is coated or printed with a heat-fusible coating agent, and the opposite surface of the plastic film is heat-melted. A packaging material characterized by being coated or printed with an adhesive coating agent. 3. A plastic film having at least one dry coating layer containing aluminum oxide as an essential component is coated or printed with a heat-fusible coating agent on the dry coating layer, and the opposite surface of the plastic film is heat-melted. A packaging material for tobacco, characterized by being coated or printed with a sticking coating agent.