SU99665A1 - The method of protection of the in-depth printing elements of the printing forms of deep offset - Google Patents

Description

A known method of protecting the in-depth printing elements of the printing forms of the deep offset is by applying a protective varnish, for example, an alcohol solution of shellac, or iditol, or bakelite varnish, on the in-depth printing elements.

In order to increase the adhesion strength of the applied film with the metal of the printing elements of the mold and the reduction of the method, it is proposed to use an alcohol solution of BF-2 varnish, consisting, for example, of one part of a varnish and three parts of a distilled alcohol.

In the manufacture of printing plates for a deep offset on a metal, for example, zinc or aluminum plate, the plate for the printing plate is applied a photosensitive layer and copied onto a film with the image to be printed. Under the transparent places of the slide, the chrome-plated colloid layer is hardened by the action of light. In the subsequent development of this image by washing in warm water, the non-annular chromic colloid on the printing places of the form corresponding to the opaque places of the transparency, is washed away, exposing the metal of the printing form, and whitespace.

Plates of the printing form remain covered with an indelible, piled layer of chrome colloid. After development, the printing plate is treated with an etching solution, which deepens the printing elements of the image.

For protection against mechanical and chemical effects on printing elements of the printing form, for example, a cotton swab, a protective film of an alcohol solution of BF-2 varnish, consisting, for example, of one part of a varnish and three parts of rectified spirit, is applied. The polyethylene film is dried at a temperature of 50-60 ° C.

The protective film of the alcoholic solution of BF-2 varnish has an increased adhesion to the metal of the printing form and durability against mechanical and chemical effects both during the processing of the printing form and during printing.

In order to hydrophobize the printing sites, the mold is rolled with a lacrimal paint, after which the zakolny colloid is removed from the gap spaces with acid treatment and then with hydrophilizing solution.

Subject invention

1. A method of protecting in-depth printing elements of printing plates, a deep offset, which consists of

No. 99665 -2 that the printed elements of the BF-2 form-varnish in a ratio, for example,

we apply a protective lacquer film, one part lacquer to three parts

characterized in that, with rectified ethanol-alcohol,

To increase the adhesion strength 2. Acceptance of the method according to

applied film smetallom pecha-p. 1, characterized in that

melting elements of the form and cheapening; drying the varnish film, coating

Lenin cost of the method, as produced at a temperature

Lacquer used alcohol solution 50-60 ° C.