Organic glass screen printing process technology is analysed

Process is the main mode for organic glass screen printing plate making. It is through the photographic equipment, copy to text, design, in accordance with the requirements, shooting on the plates, thus the blank screen printing plate making use of Yang diagram.

because of photographic technology is applied to screen printing plate making, so as to expand the application range of screen plate making and printing. Photographic negatives, not only can provide a very fine line, text blank, also can copy colour, order complex design, created to meet the requirements of printing plate making color negatives. Therefore, photoengraving, occupies an important position in the organic glass screen printing plate-making process.

organic glass screen printing photoengraving process can be divided into line, transcript photography; Monochrome screen picture, color mesh adjustable color photographic three categories.

the following simple introduction process of the specific content of each craft link:

(1) the whole draft: sorting the manuscript, determine the proportion of spring style, rule line is determined.

2. Photo: use of photographic equipment, equipment, monochrome or color pieces of the manuscript.

3. Development: after the exposure of the film in the developer enhancement. Film after exposure, the silver halide emulsion layer by light effect of latent image formation, the developer of the chemical treatment, latent image becomes visible images. Developer is commonly used by the developer to vomit, ( And in accordance with Aaron) And a few slaves, Scientific name, also known as the sea, hydroquinone) ； Protective agent sodium sulfite. Promoting agent sodium carbonate; Inhibitors, potassium bromide, etc.

4. Fixing: after fixing is in order to make the development of silver as unchanged for a long time, the principle of which is not on the film photographic silver halide dissolved out, and fixed image is obtained. Fixing bath for sodium thiosulfate (commonly Sodium hyposulphite) Solution. In order to prevent the film developing reaction in fixing bath can add a certain amount of weak acid in ordinary fixing bath made acidic fixing bath, the acid fixing bath pH between 4 ~ 6 shall be maintained. In order to strengthen the mechanical strength of emulsion, can add a certain amount of potassium alum in acidic fixing bath, chrome alum, etc. , furthermore made hardening fixing bath.

5. Water: water is divided into intermediate water and finally washed. Intermediate washed before after developing, fixing and can have the effect of stop show and protection of fixing bath; Finally washed after fixing, its role is washed away in the process of fixing generated soluble double salts on the film. Washing water to flow water as well, the water temperature should be kept in the 16 ~ 24 ℃.

with photographic method for making negatives, easy operation, fast speed. In recent years, the emergence of automatic developing machine and automatic fixing machine, make the photoengraving technology gradually mechanization and standardization.