RU1818246C - Method and device for manufacturing printing form - Google Patents

Description

printing form (square, round, oval, etc.). The frame should rise above the plane on which the drawing is made to a certain height, usually 1-3 cm, because the height of the frame will determine the future thickness of the plate.

After setting the frame, a gypsum solution, similar in texture to thick sour cream, is applied onto the inside of the frame over the pattern. The solution fills the entire space within the frame.

After setting the gypsum, the frames are removed and the finished gypsum printing plate is removed from the plane, on which the convexities from the adhesive composition, which made the drawing on the plane, form depressions (white space elements of the printing form), in those places of the drawing where there is no adhesive layer - printing forms are formed elements, in places of a thin adhesive layer, due to its partial dissolution in the aqueous medium of gypsum mortar, chiaroscuro elements are formed.

The front side of the finished gypsum mold is washed with a stream of water to remove adhesive and salt residues adhering to the mold. In order to strengthen the print surface, it can be impregnated with nitro varnish.

In Fig.1 shows a device with a plaster layer; figure 2 is a section aa in figure 1.

 The device comprises a flat smooth base (e.g., glass) 1, placed on a desktop 2.

On the basis of 1 glue paint or glue 3 a drawing is made, made with the necessary alternation of thickness and gaps of the glue layer. Figure 3 is edged around the perimeter by a frame 4, which rises above the base to a height of 1-3 cm. The space inside the frame is filled with gypsum mortar 5, which upon hardening forms a gypsum form. In order to simplify the application of the pattern with adhesive paint on the glass surface, a pre-made pattern b can be placed under it.

Claims (4)

1. A method for the manufacture of printing plates, including the manufacture of an intermediate form, applying a working solution to this form with holding it until it hardens, removing the form, washing it, drying and varnishing, characterized in that the intermediate form is made by applying the image on a flat smooth the surface with glue paint on the basis of glue which is not very resistant to water or with glue itself, while before applying the working solution to the intermediate form, a fenced frame is installed around its perimeter, which is removed after solidification working solution, moreover, a gypsum solution is used as the latter. 2. The method according to claim 1, characterized in that before applying the layer of gypsum mortar, an intermediate form with a dry layer of adhesive paint or glue is sprinkled with small granules of a substance readily soluble in the aqueous medium, and then excess granules that are not adhered to the adhesive layer are removed. 3. A device for the manufacture of printing plates, containing a casting apparatus and placed in it an intermediate form, characterized in that the intermediate form is made in the form of a flat, smooth a base with an image made with glue paint based on water-resistant glue or glue, the casting apparatus including a frame that surrounds the perimeter of the intermediate form and rises above it (by 1-3 cm, forming a container for the working solution. 4. The device according to p. 3, characterized in that the base is made of transparent material. 12 FIG. 1 Aa / 2