JPS6214687A - Heat shrinking label with deposited metal pattern - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a heat-shrinkable label having a vapor-deposited metal film pattern.

[Conventional technology]

Labels are produced by vapor-depositing metals such as aluminum (AI) onto plastic film, and creating patterns such as letters, symbols, designs, borders, etc. on the surface of the film using the vapor-deposited metal film, in the same way as cutting out and printing metal foil. It has a special visual effect with a metallic luster, and has recently been used as a means to create individuality in products such as cosmetics, to give a sense of fashion and luxury, etc., depending on the nature of the product.

Figure 3 shows a label (10) with a vapor-deposited metal pattern attached to a container (B).
) is shown below. (1) is a plastic film that is the base material of the label, (2) is a vapor-deposited metal film, and (4) is a plastic film that is the base material of the label.
) is the adhesive layer. The label (10) has an adhesive layer (4
) on the surface of the container (B). The vapor-deposited metal film (2) is formed into a film (2) along a predetermined pattern.
The adhesion pattern of the vapor-deposited metal film is formed on the inner surface of the film (1) (the surface that comes into direct contact with the container).
It is visible as a pattern through the light. Note that the vapor-deposited metal film (
2) is formed on the inner surface of the film (1) as shown in the figure, so that the film (1) acts as a protective film for the vapor deposited metal film (2) and prevents the vapor deposited metal from peeling off, staining, etc. It has become.

[Problem to be solved]

Incidentally, labels based on heat-shrinkable plastic films are often used as labels for products. Heat-shrinkable labels are placed on the outside of a container, etc., and subjected to a simple heat treatment such as blowing hot air to cause heat shrinkage (the amount of shrinkage is typically about 5-10%), so that it can be attached to the surface of the container reliably and neatly. It adheres well.

However, when using a label with a vapor-deposited metal pattern formed on it as a heat-shrinkable label, if heat-shrinking treatment is applied,
There is a problem in that the deposited metal film loses its metallic luster and turns white or grayish (whitening phenomenon). This cloudy white phenomenon is thought to be due to microscopic fracture or roughening of the vapor-deposited metal film as a result of compressive stress in the film surface direction being applied to the vapor-deposited metal film as the film thermally shrinks.

As a measure to prevent this clouding, (a) the bonding strength of the deposited metal film to the film is increased by controlling the metal deposition processing conditions (slowing the deposition rate and increasing the thickness of the deposited film);
b) Heat the label to the lowest possible amount of heat shrinkage (shrinkage amount 1~
(c) coating the vapor-deposited metal film with an anchor coat to strengthen the vapor-deposited metal film.

However, method (a) (control of vapor deposition conditions) inevitably reduces vapor deposition efficiency and increases cost, and furthermore, the effect of preventing clouding is not necessarily sufficient.

In addition, in the case of method (b) (limiting the amount of heat shrinkage), 1 to 2%
In order to make the label adhere to the container surface with only a small amount of shrinkage, it is necessary to use a label with a small inner diameter, which makes it extremely difficult to fit the label onto the container and significantly reduces the efficiency of the fitting process. forced to decline. Also,
Since the adhesion of the label to the container surface (tightening force due to heat shrinkage) is weak, there is a drawback that the label tends to fall off when removed. Method (C) (application of anchor coat) does not have the same problems as methods (a) and (b) above, and is a relatively simple method, but it is unreliable in terms of clouding prevention effect. This is the difficult point.

For this reason, although heat-shrinkable labels with vapor-deposited metal patterns have been recognized to have excellent label functions, the reality is that they have hardly ever been put to practical use.

[Means for solving problems]

In research on preventing clouding of vapor-deposited metal films, the present invention unexpectedly found that, contrary to conventional methods, vapor-deposited metal films are
This method was developed based on the discovery that if it is formed on the outer surface of the label, the vapor-deposited metal film can be heat-shrinked and adhered to the surface of the article without becoming cloudy.

That is, the vapor-deposited metal patterned heat-shrinkable label of the present invention is characterized in that a patterned vapor-deposited metal film is formed on its outer surface.

[Effect]

As shown in FIG. 1, the vapor-deposited metal patterned heat-shrinkable label of the present invention has a vapor-deposited metal film (2) formed on the outer surface of the base film (1). As shown, when an article (B) such as a container is fitted onto the outside and subjected to heat treatment such as blowing hot air (h) or infrared irradiation from the outer surface, the part to which the vapor-deposited metal film (2) is attached becomes a vapor-deposited metal. Because the film functions as a heat-reflecting film, the base film on the back side hardly shrinks due to heat, while hot air, etc. acts directly on the base film on the parts where the vapor-deposited metal film is not attached (exposed parts). This causes heat shrinkage.

That is, in the heat-shrinkable label of the present invention, as shown in FIG. The part (a) covered with the vapor-deposited metal film (2) is selectively heat-shrinked, thereby reducing its diameter as a whole and coming into close contact with the surface of the article. Since the base film b) does not substantially undergo heat shrinkage, compressive stress that causes clouding of the vapor-deposited metal film (2) does not occur, and therefore even after the heat-shrinking treatment of the label is completed, the vapor-deposited metal film (2) does not shrink. The metal film (2) has the same metallic luster as the original.

In addition to the method of fitting the heat-shrinkable label of the present invention onto an article as a tube-shaped label as described above, it can also be wrapped around the surface of an article as a sheet-shaped label and bonding the overlapping portions of both edges. It is also possible to form the tube into a tube and then heat-shrink it.

The vapor-deposited metal pattern of the heat-shrinkable label of the present invention is formed by various vapor deposition methods known as partial vapor deposition methods, such as etching method, water washing method, and masking method. The thickness of the film may be the same as that of a normal film, for example, 100 to 1000 people. This film thickness is also sufficient to function as a heat reflective film during heat shrinkage treatment. If the vapor-deposited metal film is formed on the entire surface of the label, it is impossible to reduce the diameter of the label by heat shrinking treatment, so it goes without saying that it is necessary to partially expose the base film. Although the pattern is not particularly limited, in order to cause sufficient heat shrinkage (reduction in diameter) of the label, it is preferable that about 40% or more of the entire label is an exposed surface.

As the base film, various heat-shrinkable plastic films such as polyvinyl chloride, polypropylene, polyethylene, or a laminate film of two or more of these films can be used as appropriate. The film thickness may be, for example, 15 to 100 μm, similar to normal labels.

The heat-shrinkable label of the present invention has a resin coating or a plastic film that covers the vapor-deposited metal film (2) as a protective film to prevent the vapor-deposited metal film (2) on the outer surface from peeling off or damage, as shown in FIG. It is preferable to provide a coating (3) consisting of: The film thickness may be about 1 to 5 μm.

It should be noted that the heat shrinkable label of the present invention may be provided with a pattern using printing ink on the outer or back surface of the label along with the vapor-deposited metal film pattern, if desired.

〔Example〕

(1) Label (1) Base film: Stretched polyvinyl chloride film (thickness: 70 μm) (2) Letters and floral patterns were formed on almost the entire outer surface of the tube using a vapor-deposited aluminum vapor-deposited film. Deposited film thickness: approx. 500, exposed area: approx. 70% (3) Film: A resin coating (thickness: 2 μm) is applied to the entire outer surface as a protective film for the vapor-deposited metal pattern.

(4) Label size: folded diameter 95 dragons x length 100 fins.

[11] Heat shrink treatment The above tubular label (20) is attached to a plastic bottle (
The body was fitted onto the body (outer diameter: about 50 to 60 mm), and as shown in FIG. 2, hot air (h) was blown by a heating device (H) to cause heat shrinkage.

Hot air temperature = 100-110°C, processing time = 4 seconds, shrinkage rate: 8-10% The label adhered to the bottle surface by the above heat shrinking process is completely integrated with the bottle surface due to sufficient shrinkage force. In addition, the vapor-deposited metal pattern has the same beautiful metallic luster as before the heat shrink treatment.

〔Effect of the invention〕

The heat-shrinkable label of the present invention adheres closely to the surface of the article without causing clouding of the vapor-deposited metal film through heat-shrinking treatment, and the vapor-deposited metal pattern remains as beautiful as before when it is attached to the surface of the article. It retains its metallic luster, and its unique visual effect makes it an excellent label.

In addition, the heat-shrinkable label of the present invention does not impose any special restrictions on the metal vapor deposition processing conditions (lower vapor deposition speed, thicker film) as in the past, so the manufacturing cost is low and the product is more durable. Since there are no restrictions on heat treatment conditions for adhesion (minimization of heat shrinkage rate), it has great industrial significance, such as being able to efficiently and smoothly apply external fittings to articles and heat shrink treatment. have.

[Brief explanation of the drawing]

FIG. 1 is a half-cut cross-sectional view schematically showing an embodiment of the label of the present invention, FIG. 2 is a longitudinal cross-sectional view showing an example of the state of the label of the present invention adhered to an article by heat shrink treatment, and FIG. FIG. 4 is an explanatory cross-sectional view showing the shrinkage behavior of the label of the present invention due to heat shrinkage treatment, and FIG. 4 is a cross-sectional view showing an example of a conventional label adhered to the surface of an article. Base film, 2: Vapor-deposited metal film, 3: Protective film.

Claims (1)

[Claims] (1) A label that uses a heat-shrinkable plastic film as a base film and is applied to the surface of an article by heat-shrinking treatment, and is characterized by having a pattern formed by a vapor-deposited metal film on the outer surface. Heat shrinkable label with vapor deposited metal pattern.