JP2503524B2 - Method of manufacturing light control film having pattern - Google Patents

Description

Detailed Description of the Invention

 Purpose of the invention

[Industrial applications]

The present invention relates to an improvement in a method for producing a light control film having a pattern.

[Prior art]

One type of light control film that is used for windows and show windows to control the amount of light transmitted into the room is one that allows the pattern to be seen from the outside and a regular light-shielding pattern to be seen from the inside. . As one of the techniques for producing a light control film having this pattern, a pattern is printed on a translucent base film in a specific pattern, for example, in a dot-shaped pattern, and the same light-shielding ink is used on the pattern. There is a method of printing a dot pattern and forming a light shielding pattern on the entire surface. When this method is used, patterns of the same shape have to be overprinted, and it is difficult to register the printing. When trying to improve the registration accuracy, the yield of the non-defective product becomes low, the printing speed becomes slow, and the cost becomes high, and the registration accuracy that can be obtained is limited. As an alternative method, there is also a method of forming a light-transmitting pattern by forming blank patterns in a dot pattern on a product obtained by printing a pattern on a light-shielding base film by pressing or the like. The disadvantages of this method are that the cost of die cutting is high, and that the obtained product has burrs and dusts are mixed. It is difficult to manufacture a light control film for a large show window by punching.

[Problems to be Solved by the Invention]

The object of the present invention is to break the current state of the technology described above, to eliminate the problem of registration of printing, to prevent burrs from occurring, and to prevent the inclusion of punch residue, to limit the size of the product, and to reduce the cost. Is to provide an inexpensive method for producing a light control film having a pattern. Structure of the invention

[Means for solving problems]

The method for producing a light control film having a pattern of the present invention comprises the following steps. A) a step of producing a light-shielding base film from a substance that decomposes when heated in the presence of an acid or an alkali; and b) As shown in FIG. 1, a pattern is provided on one surface of the light-shielding base film 1. Printing step 2) c) As shown in FIGS. 2A and 2B, dot-shaped pattern printing is performed on the other surface of the light-shielding base film 1 using an etching ink containing an acidic or alkaline substance. 3), and d) heating to decompose the dot-shaped pattern printing portion 3 to perform etching, and as shown in FIGS. 3 and 4 A and B, a light-transmitting light including dot-shaped through holes. A step of obtaining a light control film having a pattern by forming the pattern 4 and the matrix-shaped light shielding pattern 5. Polyacetal is a material that decomposes when heated in the presence of an acid or an alkali and can be molded into a base film. A black or brown coloring agent is added to provide light-shielding properties. Film thickness is 50-500
About μ is suitable. When it is desired to improve the adhesiveness of the pattern printing, it is advisable to subject the surface of the film to treatments such as corona discharge, plasma, flame and etching. The printing of the design may be carried out by using a commonly used printing ink by silk screen printing or any other method. As the acidic substance contained in the etching ink,
Sulfuric acid, hydrochloric acid, nitric acid, boric acid, hydrofluoric acid, acetic acid, phenol, etc. are used. As the alkaline substance, sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonia, amine and the like can be used. As a binder for the etching ink, polyester, acrylic resin or the like is used, and about 0.1 to 10% by weight of the above acidic or alkaline substance is mixed therein. The dot-shaped translucent pattern has many small circles, ellipses,
It is arbitrary such as a polygon. The dot-shaped light-transmitting pattern may be printed by silk screen printing or any other method using the above-mentioned etching ink. If necessary, an infrared absorbing film or the like may be attached to the back surface of the manufactured light control film with an adhesive to protect it from heat rays.

[Action]

When a pattern-printed and etching-ink-printed product is heated, the acid or alkali in the etching ink causes the base film to decompose and collapse, forming dot-shaped through holes. Also in the pattern printing, the part where the film as the support is lost becomes a through hole. The obtained light control film is used by being attached to a show window or the like so that light from the outside can be applied from the side on which the pattern printing 2 is applied. When viewed from the outside, as shown in FIG. 3, the print 2 of the design, in the illustrated example, the character "1" can be seen. The dot-shaped through holes are the light-transmitting pattern 4, and the remaining matrix portion is the light-shielding pattern 5. When viewed from the inside,
As shown in FIG. 4A, only the light-transmitting pattern 4 and the light-shielding pattern 5 appear regular. In this manufacturing method, the amount of transmitted light can be easily controlled by adjusting the area ratio between the matrix and the dot-shaped through holes.

【Example】

A 150 μm-thick polyacetal film (Polyplastics Co., Ltd.) colored with a black pigment was dipped in a 40 Baume ferric chloride solution containing 10% hydrochloric acid for 3 minutes, washed with water and dried. Epoxy resin ink "# 1,000" (Seiko Advance Co., Ltd.) was printed on one side of this polyacetal film using a Tetoron 270 mesh silk screen plate to print the pattern as shown in FIG. 2 and dried for 30 minutes at a temperature of 110 ° C. An etching ink having the following formulation was prepared: Sulfuric acid 0.5 parts by weight Polybutyl metacleriate 20 Red pigment 9 Barium sulfate 15 Solvent 55 Defoamer 0.5 Total 100 Parts by weight This etching ink is printed on the other surface of the above polyacetal film by using a Tetoron plate 250 mesh silk screen plate having a pattern in which many small circles are arranged in a staggered pattern, and is shown in FIG. Such a dot-shaped pattern printing 3 having a thickness of 8 μ was performed, and after heating this at a temperature of 125 ° C. for 30 minutes, it was washed with water from the shower nozzle. As a result, as shown in FIGS. 3 and 4, a light-transmitting pattern 4 including dot-shaped through holes and a matrix-shaped light-shielding pattern 5 were formed to obtain a light control film having a pattern. EFFECTS OF THE INVENTION According to the method for producing a light control film having a pattern of the present invention, the problem of registration of printing can be substantially eliminated, and the worry of burrs and scraps due to punching can be eliminated, and the pattern having a pattern can be adjusted. Optical films can be manufactured at low cost, and product size is unlimited, as long as films of material are available and printable.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are each for explaining each step of the method for producing a light control film having a pattern according to the present invention. FIG. Figure 2 shows the step of printing the dot pattern.
It is a top view respectively shown. 3 and 4 each show a light control film having a pattern obtained by the manufacturing method of the present invention. FIGS. 3A and 4 are plan views, and FIG. 3B is FIG. 3 is a schematic cross-sectional view in the II direction of FIG. 3A. 1 ... Light-shielding base film 2 ... Pattern printing 3 ... Dot pattern printing 4 ... Translucent pattern 5 ... Light-shielding pattern

Claims (1)

(57) [Claims] 1. A method for producing a light control film having a pattern, which comprises the following steps: a) a step of producing a light-shielding base film from a substance which decomposes when heated in the presence of an acid or an alkali; Step of printing a pattern on one side of the base film of c.) Step of printing a dot pattern on the other side of the light-shielding base film using an etching ink containing an acidic or alkaline substance And d) By heating, the dot-shaped pattern printing portion is decomposed and etched to form a light-transmitting pattern consisting of dot-shaped through holes and a matrix-shaped light-shielding pattern, thereby forming a pattern having a pattern. The process of obtaining an optical film.