Choice of screen mesh number and factors affecting plate quality (1)

In addition to the selection of plate-making materials, the key to improving the quality of screen printing products lies in the rationality of the screen printing plate production process. At present, screen printing plates are mostly hand-made, and there is an urgent need for the improvement of plate-making techniques. Here, some of the problems encountered in the manual platemaking process are discussed briefly.

We have used three kinds of plate-making materials: dichromate silk screen film (film paper), diazo film screen glass and alcohol-soluble nylon screen film (hereinafter abbreviated as F, D, N). In the production process, various kinds of materials should pay attention to the following issues:

First, the choice of screen mesh number and the impact of stretch net on the quality of the printing plate

l, the choice of screen mesh number

The number of screen meshes to be selected depends on the printed pattern and the requirements on the pattern. If the pattern is larger and the lines are thicker, and the requirements for the pattern are not as accurate, a mesh with a lower mesh number may be used. Conversely, if the pattern is small, the lines are narrow, and the pattern needs to be precise, a mesh with a higher mesh number should be used.

The number of screen meshes directly affects the printing quality. Because of the relatively low screen mesh, the printing ink permeability is good and the mesh is not easy to plug. However, the number of meshes is too low, and it is easy to infiltrate the printing material too much, resulting in unclear pattern edges and pattern distortion.

The high number of screen meshes can meet the requirements of clear edges and lines. However, the number of screen meshes cannot be higher than the number of printed materials. Otherwise, it will easily block the mesh. Therefore, a moderate number of meshes should be selected, generally between 120 mesh and 300 mesh. The dichotomy in the single-factor merit selection method can be used as a selection test.

2, stretch net

When the screen is stretched over the frame, the degree of tightness should be appropriate, and it should be noted that the tension at each point in the frame should be the same. If the screen is stretched too tight or too loose, or if the tension at each point is inconsistent, the following problems may occur:

The screen is stretched too tightly: to make the printing plate lose its elasticity, resulting in distortion of the pattern during printing;

The mesh is too loose or the tension is not the same:

1 fine lines cannot be developed;

2 The edges of the pattern appear zigzag, and the pattern distortion;

3 Leakage phenomenon during the printing process;

4 In terms of F plates, the adhesion between the film and the screen is poor, resulting in the phenomenon of film peeling during development;

For D and N versions, the layout is difficult to evenly flatten when squeegeeing. The glue cannot adhere tightly to the screen. D version of the film caused by the development of the phenomenon of smooth slipping off the N version of the layout is also very easy to produce trachoma.

5 In terms of F and D, the net is loose and it also affects the reuse of the screen.

(to be continued)

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