The method of manufacture of offset printing plates on triacetylcellulose film

 

(57) Abstract:

Use: in the production of offset honorary plates. The inventive triacetylcellulose film is chemically processed and put a sublayer of water-soluble polymers with a thickness of 2 to 6 μm. As the polymer used polyvinyl alcohol and polivinilpirolidon at a ratio, respectively, 8.0 to 9.5 : 0.5 - 2.0 wt. PM or polyvinyl alcohol and hydroquinone at a ratio of 1:2-4 wt. hours Then put on film photosensitive layer on the basis of diazoma.

The invention relates to the printing industry and can be used for the production of offset printing plates.

A known method of manufacturing a photomechanical printing plates, which uses film materials obtained in a known manner. A disadvantage of the known method of producing thin film materials, in particular, on triacetylcellulose basis, is the fact that a film material obtained by a known method cannot be used for offset printing plates and more plates.

The closest analogue is a method of manufacturing plates on triacetylcellulose the Tr caustic potash) for 1.5-2.0 hours, followed by the application on the hydrophilic surface triacetate film photosensitive layer on the basis of diazoma. The length of the forms obtained in a known manner, only 2-3 thousand impressions. The disadvantage of this method is the fact that the plates produced according to this method, and then the printing plate is exposed and propodosoma surface contamination offset layer. The technical result of the proposed method is the elimination of these disadvantages.

This technical result is achieved in that in the method of manufacturing festou plate on triacetylcellulose the film, including chemical processing of the film and application of a photosensitive layer on the basis of diazoma, according to the invention, before application of the photosensitive layer on the surface of the film in addition put a sublayer of water-soluble polymers are polyvinyl alcohol and polyvinylpyrolidone at a ratio respectively of 9.0 to 9.5: 0.5 to 2.0 wt. h or polyvinyl alcohol and hydroquinone at a ratio of 1:2-4 wt. including a thickness of 2 to 6 microns.

The method is as follows.

Example 1. Before applying the light is the third film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in the ratio 8:2 by weight. PM or polyvinyl alcohol and hydroquinone in the ratio of 1:2 by weight. including the thickness of 2 μm.

Example 2. Before application of the photosensitive layer on the basis of diazoma on the surface of the pretreated triacetylcellulose film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in the ratio of 9:1 by weight. PM or polyvinyl alcohol and hydroquinone in the ratio of 1:3 by weight. PM 4 µm thick.

Example 3. Before application of the photosensitive layer on the basis of diazoma on the surface of the pretreated triacetylcellulose film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in the ratio of 9.5:0.5. including thickness of 6 μm.

The method of manufacture of offset printing plates on triacetylcellulose films, including chemical processing of the film and application of a photosensitive layer on the basis of diazoma, characterized in that before applying the photosensitive layer on the surface of the film in addition put a sublayer of water-soluble polymers, polyvinyl alcohol and polyvinylpyrrolidone in a ratio, respectively 8,0 9,5 0.5 to 2.0 wt

 

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