CS240595B1 - Material for graphic reproduction technology - Google Patents

Abstract

The invention relates to a material for graphic reproduction technology. According to the invention, the material contains, per 100 parts by weight of thermoplastic, 5 to 400 parts by weight of calcium carbonate, gypsum, talc, barium sulfate or zinc or titanium white. Engraving or etching exposes the inorganic filler that accepts the color. The material is used for precise production of reproductions of engravings or etchings. It allows the replacement of non-ferrous metals with filled thermoplastics.

Description

The invention relates to a material which can be used in place of the deficient, in particular non-ferrous metals, used for the art reproduction technique.

For deep printing, mainly metallic materials are used, where the smooth surface allows easy removal of ink from areas that have not been damaged by engraving or etching and which should not be printed after application and wiping.

Engraving in metallic materials is difficult, and the benefits of being able to produce a large number of reproductions, especially for works of art for a limited number of prints, are not exploited.

The metal material can therefore be replaced by organic thermoplastics which are easy to engrave and which can also be etched by selecting a suitable solvent. A wide variety of plastics such as polyethylene, polypropylene, polystyrene, polymethyl methacrylate, polyamide or polyvinyl chloride are suitable. The surface of these materials in the form of sheets or foils is smooth and practically does not accept ink. Engraving into it is easy, but some problems occur when engraving deeper grooves, when the material on the side of the groove is pushed over the surface of the plate. Also, the color in the grooves does not hold evenly and the printed line is not evenly saturated. Next. the disadvantage is that some of these materials, especially polyolefins, are too soft and can withstand minimal reproductions.

These problems when using thermoplastics are avoided by the graphic reproduction technique of the present invention. Its essence is that it contains per 100 wt. parts of thermoplastic 5 to 400 wt. parts of calcium carbonate, gypsum, talc, barium sulfate or zinc or titanium white.

The presence of an inorganic filler results in an increase in the hardness of the material, which results in an accurate reproduction of the engraved lines. This is important, for example, in the so-called dry-needle technique. The thermoplastic plate is glossy on the surface and does not receive color. On the other hand, in the engraved groove, the material is so disturbed that the paint comes into contact directly with the inorganic filler, which binds them evenly. The material can also be etched by the action of solutions dissolving inorganic filler or thermoplastic. The inorganic filler increases, in addition to the hardness, the compressive strength, thus making it possible to produce more reproductions.

He did

Polyethylene sheet containing 40 wt. calcium carbonate in the form of micronized limestone having a grain size below 15 micrometers is used for dry-needle engraving. After the paint has been applied and wiped off, an engraving is obtained by pressing on the substrate.

Example 2

Tough polystyrene board with a 5% by weight content. The gypsum was treated as in Example 1 to give an engraving.

Example 3

Plate extruded from suspension polymethyl methacrylate containing 10 wt. barium sulphate. In addition to polymethyl methacrylate, a methyl methacrylate-styrene copolymer may be used. Other uses as in Example 1.

and

Example 4

Tough polyvinyl chloride plate containing 15% by weight titanium or zinc white using as in Example 1. Example 5

Cylinder made of polyamide 6 containing 30 wt. The talc is etched according to the pattern with formic acid, rinsed with water, dried, applied paint, wiped and printed on a substrate such as a cloth.

Example 6

Polypropylene board containing 70% by weight The calcium carbonate in the form of micronized limestone is treated with a dry needle as in Example 1, optionally optionally etched with dilute hydrochloric acid.

Claims (1)

Thermoplastic based graphic reproduction material characterized in that it contains per 100 wt. parts of thermoplastic 5 to 400 wt. parts of calcium carbonate, gypsum, talc, barium sulfate or zinc or titanium white.