JPS62228460A - Metallic vapor deposited film for packing - Google Patents

Abstract

PURPOSE:To enhance the design effect without deteriorating the gas impermeability by successively forming an aluminum oxide layer and a metallic aluminum layer on a plastic film and by partially removing the upper metallic aluminum layer. CONSTITUTION:An aluminum oxide layer 2 and a metallic aluminum layer 3 are successively formed on at least one side of a plastic film 1 and the upper metallic aluminum layer 3 is partially removed in a desired pattern. The resulting metallic vapor deposited film for packing enables the identification of the contents.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a metallized film for packaging. More specifically, the present invention relates to a metal vapor-deposited film for packaging that has excellent gas barrier properties even though the vapor-deposited metal layer has been partially removed.

(Prior art) Conventionally, a partially transparent metal-deposited film for packaging with an arbitrary pattern has been produced by applying a water-soluble or solvent-soluble polymer to the surface of a plastic film in a desired pattern. After that, a metal such as aluminum is vapor-deposited over the entire surface, and then the polymer-coated area is roughly washed with water or immersed in a solvent to dissolve and dissolve the polymer-coated area.
It is known whether it is obtained by removing it.

In addition, as a metallized film for packaging using another method,
Metal is vapor-deposited on the surface of a plastic film, then a polymer is partially printed or coated in an arbitrary pattern, and then the untreated areas are washed with water or treated with an alkaline aqueous solution, etc. to dissolve the parts that have not been treated.・There is a known method for removing it.

The metal to be vapor-deposited must be tin, zinc, aluminum, etc. Among these, aluminum is widely used because it has excellent light reflection properties, corrosion resistance, and is versatile.

(Problems to be solved by the present invention) The metal-deposited film for packaging prepared by the conventional method described above maintains sufficient gas barrier properties in the portion where the metal-deposited layer remains. For the transparent part where the metal vapor deposited layer is cut out in the center with an arbitrary design so that the contents can be seen from the outside, it is simply equal to the base ilm's scum barrier 1 cow, and maintains sufficient gas barrier U. However, it was insufficient as a practical packaging film.

Moreover, in order to solve this drawback, there is a method of coating the plastic base film with vinylidene jn resin in advance. However, if this method is used for a long time, the vapor-deposited metal will undergo a chemical change with the chlorine ions in the vinyl chloride (vinyl chloride), resulting in partial disappearance, resulting in a stable gas. Interception [Metalized film for raw packaging cannot be obtained. Furthermore, there are many drawbacks such as yellowing of the vinylidene resin layer and poor adhesion to the base film.

An object of the present invention is to provide a metallized packaging film that does not have these drawbacks mentioned above.

(Means for Solving the Problems) That is, the present invention includes an aluminum oxide layer on at least one side of a plastic film and a metal aluminum layer laminated on the aluminum oxide layer, and the metal aluminum layer is optional. This invention relates to a metal-deposited film for packaging, characterized in that the design is partially removed.

The metal-deposited packaging film according to the present invention has a transparent (deposited layer removed) portion with an arbitrary pattern, but exhibits stable gas barrier properties over a long period of time.

The plastic film used in the present invention includes polyolefins such as polyethylene and polypropylene, polyesters such as polybutylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6 and nylon 66, aromatic polyamides, polyimides, cellophane, acrylic, and poval ethylene. Refers to films made from materials such as those exemplified by Furthermore, the material for the plastic film in the present invention may be a copolymer of the above polymers and other organic polymers, and any material containing other organic polymers is always suitable. In general, these organic polymers may be melt-extruded or -axially or biaxially stretched, depending on the use, and are not particularly limited.

Further, antistatic agents, ultraviolet absorbers, colorants, heat stabilizers, internal lubricants, etc. may be added to these 111 combinations by known methods, and resins etc. may be pre-coated for special purposes. The use of these is not particularly limited.

In general, these plastic films are not particularly limited even if they have been previously subjected to surface treatment such as corona discharge treatment or plasma treatment, or surface interphase treatment by physical or chemical methods.

The thickness of the plastic film used in the present invention is not particularly limited, but is preferably 9 to 5 CII11, and more preferably 12 to 25 μm from the viewpoint of dimensional stability and ease of handling.

Aluminum oxide in the present invention refers to AσO1Aα
○, aluminum oxide such as Aα203, or other substances may be contained in the aluminum oxide thin film to the extent that gas barrier properties are not impaired.

In addition, the aluminum oxide of the present invention preferably has scum barrier properties (from the raw point of view) and formability, and is therefore preferably amorphous.

Crystallization and non-crystallinity can be easily determined by ordinary X-ray diffraction method. In other words, amorphous aluminum oxide in the present invention means one in which no specific diffraction is observed in X-ray diffraction.

Although the thickness of the aluminum oxide opening is not particularly limited depending on the application, it is generally preferably in the range of 30 to 5000 mm in order to exhibit gas barrier properties. From the viewpoint of economical advantage or prevention of iris coloration, it is more preferable to use 100 to]○○O. If the thickness is less than 30 Å, the cass blocking property alone is insufficient, and if it is more than 5000 Å, it is not preferable because it may cause iris coloration due to light interference phenomenon or the possibility of cracking.

The aluminum oxide layer can be formed by vacuum evaporation of aluminum oxide powder or solid material by vacuum evaporation, sputtering, ion blasting, etc., or by the above-mentioned vacuum evaporation method in which aluminum is introduced into an oxygen gas introduction system. A method is adopted to do so.

Additionally, the aluminum oxide layer may be formed at the same time as the metal aluminum layer is deposited. Alternatively, the aluminum oxide thin film layer may be obtained by forming an aluminum vapor-deposited layer by a known method and then oxidizing it in a subsequent step or a separate step, and there is no particular limitation.

The metal aluminum layer is formed by vapor deposition on the aluminum oxide thin film layer by a conventional method, but the thickness of the aluminum layer may be sufficient as long as it has sufficient metallic luster and gas barrier properties, and is not particularly limited to 1ti11. do not have. Roughly,
There are no particular limitations on the method for removing the opaque aluminum vapor deposited layer in any pattern as long as it is a known method.

For example, a resin such as vinyl acetate or polyamide is usually applied to a desired pattern using gravure printing, etc., and then dipped in a hydrogen fluoride solution to make the opaque metal aluminum There are ways to remove the layers.

In addition, the metallized film for packaging according to the present invention can be used as a base material (laminated with valley 1 1 to 1, lamination mark 11,
A surface protective coating may be applied.

(Function) In the metallized film for packaging according to the present defense, the aluminum oxide layer is present on the base film even in the portion where the metal aluminum layer has been removed. Therefore, even if it is partially processed so that the contents can be confirmed, it maintains sufficient gas barrier properties, and the metallized film for packaging according to the present invention can be used for food, medicine, and electrical parts. It can be used for various packaging materials.

(Example) ・Method for measuring characteristics and characteristics Measurement and evaluation of characteristics in the present invention as shown below (■: The following method was used.

b. Using a crystalline X-ray diffraction analyzer (Rigaku Denki Co., Ltd.) for aluminum oxide layer
Kα rays (using a Ni filter) were applied to the surface of the deposited film, and the diffraction intensity was measured using a scintillation counter (manufactured by Rigaku Denki Co., Ltd.) while rotating the X-ray source using a goniometer.

(b) Aluminum oxide layer film) A polyester adhesive tape (manufactured by Nitto Denko Corporation, N, 031B) is applied to the base film, and after vapor deposition, this adhesive tape is peeled off and the difference in level between the vapor-deposited area and the non-evaporated area is removed. The step part was measured by the high-precision step measurement company (Koita Research Institute Co., Ltd.).
Measured with ET-10>

C. Oxygen permeability Seikaken type gas permeability measuring device (manufactured by Rika Seiki Kogyo Co., Ltd.)
i! 3 and Shuno transmittance measurement neck (MODERN C0
Measurement was performed using NTR0LS (manufactured by Rei Co., Ltd., OXTRAN-100).

2. Water vapor permeability It was measured using a water vapor permeability measuring device (manufactured by MODERN CONTROLS, PER~ITRAN-Wl).

0 Surface electrical resistance value The electrical resistance value of the aluminum vapor-deposited surface was measured using a four-point electrical resistance measuring device compliant with JISC-2318.

In Example 1 and Comparative Example, film 1 (12
A roll with a width of 10,100 Q and a width of 8,000 m (μ thickness) was attached to the evaporation neck payout 1III15 shown in FIG. 3,
A high-frequency induction heating vapor deposition source 7 is filled with 99.9% aluminum, and then a vacuum container 4 is placed in a 5 x 10
After exhausting to 'Torr, the refrigerant in the cold h1 drum]2 was cooled to -20'C.

After this, the vapor source 1 is heated, and the film 1 is run at 150 m/min by the take-up shaft 6 until the film thickness exhibits an electrical resistance value of 1.80/mouth on the surface of the vapor-deposited ♡ or polyethylene terephthalate film. I adjusted the input power so that After that, oxygen scum with a purity of 99% was introduced from an oxygen cylinder 10 in a semi-condition for OQ 1 minute using Gas Ryuukou 1IJII Oki 9 (manufactured by Estes Co., Ltd., Masunorocon (Herola, 5EC510)). The vapor-deposited aluminum was oxidized by blowing out from the waste outlet 8 to form an aluminum oxide layer.

The material formed on the film was confirmed to be an amorphous aluminum oxide layer with a thickness of 250 mm according to the measurement method described above.

Furthermore, on the vapor deposition surface of the aluminum oxide vapor deposition film,
Metal aluminum was deposited in a layered manner with a film thickness showing a surface electrical resistance of 2.007 mm using a deposition neck similar to that shown in FIG. 3 except that there was no part for blowing out oxygen gas. Masking tape 13 (manufactured by Nitto Denko Corporation, N0720) with a width of 5 Ctn was applied to the vapor-deposited surface of the film as shown in Figure 2, and then hydrogen fluoride water with a concentration of 3% was applied. Aluminum [Color 3 disappears due to chemical reaction with hydrogen fluoride water (
Immediately after about 8 seconds), the treated surface was washed with tap water, and after draining, the masking tape 13 was removed, and then water was removed and dried to obtain a vapor deposited film having the cross-sectional structure shown in FIG. Thereafter, the properties of the deposited film were measured. This case is referred to as Example 1, and the case of a conventional aluminum vapor deposited film not having the aluminum butyride layer 2 is referred to as Comparative Example 1, as shown in Table 1.

Example 2 In the production method of Fruit Color Example 1, the film running speed when forming the aluminum oxide layer was 100.../min, and the electric power input to the evaporation source was set to a surface electrical resistance of 1.0 Ω/min. The other conditions were the same as in Example 1, and 500
An aluminum oxide vapor layer 2 with a human thickness and an aluminum vapor deposition layer 3 with a surface electrical resistance value of 2.007 mm were partially removed from the center.

This case is shown in Table 1 as Example 2.

Example 3 Among the manufacturing methods of Example 1, the power input to the evaporation source when obtaining the aluminum oxide layer 2 was adjusted so that the surface electrical resistance value was 0.65 Ω/mouth, and the other methods were the same as in Example]. A vapor-deposited film consisting of an aluminum oxide bulk 2 with a thickness of 1000 mm and a partially disappeared aluminum vapor-deposited layer 3 was obtained. This case is not shown in Table 1 as Example 3.

Examples 4 to 6, Comparative Example 2 The same method as in Example 1.2.3 was used except that the base film was a roll of biaxially oriented polypropylene (25 μm thick) with a width of 800 films and a length of 40 ooms. 250, 500, and 1000 membranes (9 aluminum oxide layer 2 and partially disappeared metallic aluminum layer 3), respectively.
A vapor deposited film having (17)
．． It is shown in Table 1 as 5.6. Further, Table 1 shows a case of a vapor deposited film having only an aluminum vapor deposited layer without the aluminum oxide layer 2 as Comparative Example 2.

(Effect of R-light) The metal-deposited film for packaging according to the present invention has good scum barrier properties even though the metal aluminum layer is partially removed for design effects and content confirmation. Therefore, there is no deterioration or discoloration of the contents, and it can be used as a variety of packaging films suitable for stable storage over long periods of time.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of an embodiment of the present invention, FIG. 2 is a diagram showing a masking method, and FIG. 3 is a diagram showing an example of a vapor deposition head for laminating an aluminum oxide layer. 1 Niblast stick film 2 Aluminum dioxide layer 3: Metal aluminum bottom 4: Vacuum container 5: Payout shaft 6: Take-up shaft 7: Evaporation source 8: Gas outlet 9: Gas flow rate controller 10 Dioxygen cylinder] 1: Mask 12: Cooling drum 13: Masking tape

Claims (1)

[Claims] A packaging product characterized in that the plastic film has an aluminum oxide layer on at least one side and a metal aluminum layer laminated on the aluminum oxide layer, and the metal aluminum layer is partially removed in an arbitrary pattern. Metalized film.