JPS623807Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a light-shielding material used when making a so-called PS plate (hereinafter referred to as PS plate), which is a plate formed by coating an aluminum plate with a photosensitizer in advance.

When making a PS plate, a light-shielding material is used to cover areas that should not be exposed to light, but most conventional light-shielding materials are made of paper with a highly light-shielding paint applied to both sides. Therefore, pinholes are unavoidable, and if many of these pinholes are exposed to light, they are burned into the PS plate, causing problems.

In view of these problems, the present invention aims to provide a light-shielding material that can completely block light without producing pinholes.

For this reason, the present invention uses aluminum foil and adheres thin paper to both sides of the foil through an adhesive layer, thereby completely blocking light with the aluminum foil and completely blocking light with the adhesive layer and the thin paper layer. To provide a light-shielding material having cushioning properties required for light-shielding paper.

The thin paper gives a sense of cleanliness, prevents reflections on the surface of the aluminum foil, and also helps prevent scratches. Furthermore, by adhering this thin paper to both sides, the light-shielding property is enhanced and the light-shielding material is prevented from curling.

If a soft aluminum foil that has been annealed is used as the aluminum foil, since no oil or the like is attached to the surface, it can be easily bonded using a water-soluble adhesive.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 1 is a soft aluminum foil, and a thickness of about 15 μm is sufficient. 2 is an adhesive layer made of vinyl acetate emulsion adhesive applied to both sides of the aluminum foil 1;
This adhesive is a water-soluble adhesive commonly used for bonding soft aluminum. 3 is the adhesive layer 2
It is a thin paper adhered to both sides of the aluminum foil 1, and it is preferable to use one having a weight of about 20 g/m ² . Reference numeral 4 refers to printing appropriately applied to the surface of the thin paper 3, in which, in addition to markings for identifying the article, grid-like lines of a fixed pitch are printed.
It can be conveniently used for positioning when cutting out the area to be printed on film or opening a window.

Although soft aluminum foil was used in the above example, hard aluminum foil may also be used.
In that case, a solvent-based adhesive such as a polyurethane adhesive or a polyolefin-based adhesive may be used as the adhesive.

According to the light shielding material for plate making of the present invention, as is clear from the above explanation, thin paper is bonded to both sides of the aluminum foil via an adhesive layer, so that the aluminum foil and the two adhesive layers are bonded to each other. Pinholes can be completely eliminated by using thin paper. In addition, the thin paper provides the necessary cushioning properties, prevents reflections and scratches, and provides a clean feel. Furthermore, since thin paper is glued to both sides, there is no curling, which has many effects.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of an embodiment of the present invention. 1 is aluminum foil, 2 is adhesive layer, and 3 is tissue paper.

Claims (1)

[Claims for Utility Model Registration] (1) A light-shielding material for plate making characterized by thin paper bonded to both sides of aluminum foil via an adhesive layer. (2) The light-shielding material for plate making according to claim 1, wherein the aluminum foil is made of soft aluminum. (3) The light-shielding material for plate making according to claim 2, wherein the adhesive layer is a layer of a water-soluble adhesive.