Method for producing laser photo film

Abstract

The invention discloses a producing method of laser phototypesetting film, comprising double-pour emulsifying step, edulcorating step, curing step and coating step. The edulcorating step comprises a) sedimentating step, b) washing step, c) remelting step, d) sedimentating step, e) washing step, f) remelting step. A variety of purities in the emulsion are removed using more than once remelting step and the control method is easy without adding device. The property of each emulsion is stable and the coating quality and stability of film is good.

Description

technical field [0001] The invention belongs to a production method of a laser phototypesetting film, in particular to a production method of a laser phototypesetting film emulsified with a high-chlorine emulsion. Background technique [0002] Laser phototypesetting film includes helium-neon laser phototypesetting film and infrared laser phototypesetting film. At present, the production method of laser phototypesetting film includes double-injection emulsification process, impurity removal process, curing process, and coating process: [0003] Described double-injection emulsification process: at a certain temperature, under the situation of high-speed stirring, the excess of halide ions is constantly kept, silver nitrate (AgNO 3 ) solution and the alkali metal halide solution are added to the gelatin aqueous solution at a constant speed at the same time, the alkali metal halide is sodium chloride, potassium bromide or sodium chloride, potassium bromide, potassium iodide, an...

AI Technical Summary

Problems solved by technology

[0008] Generally, the coating of laser phototypesetting film is relatively thin. Since the emulsion prepared in the double-injection emulsification process is a high-chloride emulsion, during the coating process, when there are too many impurity elements in the high-chloride emulsion, it will cause defects on the film surface.

Generally, the impurity elements of high-chloride emulsion mainly include the following aspects: 1. During the preparation of high-chloride emulsion, due to the corrosion of equipment by perchloric acid, a large amount of iron ions will be left in the emulsion, and iron ions will directly affect the ash of the film. Fog and sensitivity are very unfavorable to the preservation and production of the film; 2. The emulsion matrix used in the high-chloride emulsion is gelatin, and the inorganic salts in the emulsion such as sodium nitrate, potassium nitrate, and alkaline halides are easily absorbed by gelatin and are not easy to clean Clean; 3. Various production raw materials themselves contain trace impurity elements, such as Au, Hg, Fe, Cr, Ni, Mn, Cu and sulfides. When using raw materials from different periods and origins, it is easy to cause impurities in high-chlorine emulsions The different elements cause differences in the properties of different batches of laser phototypesetting films. When using the above method to prepare laser phototypesetting films, the weight loss of silver in the film is more than 3%, and the printing cost is relatively high.