Introduction to the most popular photosensitive re

2022-08-22
  • Detail

Introduction to photosensitive resin plate

in recent years, water-soluble solid photosensitive resin plate has the advantages of simple plate making process, low cost, no pollution, good ink transfer performance, high printing resistance, light plate material, short plate making cycle, and can be matched with computer laser phototypesetting system. It is favored by small and medium-sized printing manufacturers and is gradually replacing zinc plate

photosensitive resin plate is a relief plate with photosensitive properties, which uses synthetic polymer materials as film-forming agent and unsaturated organic compounds as photo crosslinking agent. Almost all photosensitive resin plates are irradiated by light (mainly ultraviolet light), and cross-linking reactions occur between molecules, resulting in the formation of a certain insoluble relief image. Photosensitive resin plate can be divided into solid type and liquid type in terms of plate making process. The cost of solid series prefabricated plates made of saturated sexy light resin is relatively high, but the quality is relatively good, and they can be used to make commodity packaging, trademark plate and line plate; The liquid series of coated plates composed of unsaturated polyester resin (simply speaking, when using, prepare photosensitive liquid for base production, and then coat and pour resin, photosensitive and production) is relatively cheap and suitable for rough text line plates. In the actual operation of solid photosensitive resin plate making process, the following problems often occur. Only by comprehensive analysis, differential treatment, and identifying the root causes of the problems, can we solve the problems

I. resin version text, lines, and pattern lines are too thin and small, small characters and independent points fall off, and small lines are bent

in resin version plate making, common problems such as thin lines bending and small words and independent points fall off

main reasons: 1. The exposure time of resin version is insufficient according to the introduction of the first group; 2. The negative contrast is small, foggy and unclear; 3. Improper baking of resin plate and heat curing treatment; 4. When brushing the resin version, the water temperature is low, the washing time is long, the bristles are too hard, and the brushing version is too deep; 5. The pressure is too high when printing on the machine, and the adjustment is improper

solution:

1. When making resin version, when you encounter small words, lines, patterns, and independent points, you should master the correct exposure time. The exposure time of 3KW gallium iodide lamp is about 20min, which must be longer than the normal version. In this way, the small lines, words and independent points can stand and not fall off. Due to the long exposure time, the side slope of the resin plate is small (about 70), and the graphic base is firm

2. When baking resin plate, drying and heat curing treatment, generally, the oven temperature is controlled at 60-80 ℃, in order to evaporate the water on the plate; If the drying temperature is too high, the resin version is easy to blister

3. The operator is required to have excellent darkroom technology, and the contrast of film processing should be as human as possible, without fog, and the words and lines should be smooth and smooth without missing pens and strokes

4. When making solid resin plate, whether it is automatic plate brushing by plate making machine or manual brush, the water temperature should be controlled at 50 60 ℃ and washed until the bottom base is exposed: November 24. Brush the resin version by rotating. If you brush the version on one side, it is easy to brush the side slope, causing the bending and falling off of small lines; When you brush the version, you should choose those brushes with soft and suitable hair. If the hair is hard, small words will fall off and be damaged; When brushing the resin version, you should pay attention to the depth of the version. You don't have to wash the version to see the bottom. If you brush the version too deeply, it is easy to brush off the text, lines and patterns on the version. In addition, pay attention to the time of brushing and washing

5. When the resin version is printed on the machine, the ink roller and the resin version should be properly adjusted. The pressure between the resin version and the embossing cylinder should be adjusted. The printing pressure of the resin version should be less than that of the copper zinc version and the lead type. Avoid crushing the small text lines of the resin version by the inking roller and the embossing cylinder due to excessive pressure, which will affect its printing resistance

II. The text and line version are blurred when making resin version

main reasons: 1. Overexposure; 2. Vacuum absorption is not solid when drying; 3. The film contrast is small and unclear

solution:

1. Master the accurate exposure time of the resin version, especially the hollow text and lines are the easiest to paste the version. When designing, make the graphics and text as bold as possible

2. The suction of the plate printer should be firm. If the suction is not solid, there is a gap between the resin version and the film, and ultraviolet rays will be emitted from all around, resulting in a photosensitive paste

3. Before printing, carefully check whether the apricot negatives are pasted, with good light transmittance, contrast and clarity, so as to meet the needs of plate making quality

III. the resin version cannot be washed out.

main reasons: 1. The resin version of the plate has exceeded the shelf life, or light leaks during production, storage and transportation, and the resin version is photosensitive and hardened; 2. The water temperature is too low when washing and brushing the plate; 3. Fixture: metal pressing plate: 100x100mm or Φ 150mm 1 set/2 films, poor darkroom treatment, poor film shading, low density

the manufacturer of medical compounds has 13 compound production lines

Copyright © 2011 JIN SHI