Many consumers of practical screen printing meshs want to print a perfect screen printing product. First of all, to do a good photographic method, the most important exposure process is very important. This will affect the quality of the print. How to control the exposure well when printing is a relatively important step. Hebei maishi has 30 years of experience in polyester mesh. We have a deeper knowledge of screen printing.
Maishi experts talk about the choice of polyester screen printing light source
The choice of the light source is the first problem to be considered in the screen printing process. The correct selection and use of the light source is of great significance for improving the quality of the screen, simplifying operation, saving energy, maintaining health and reducing costs.
In order to improve the quality of plate making, it is necessary to fully study the matching relationship between the photosensitive material and the light source, the output power of the light source, the distance between the light source and the screen, and the wavelength of the light source, and master the exposure time.
The photosensitive material is selective to the light source. Table 1 shows the characteristics of several common light sources and the radiation wavelength. It can be seen that all the emulsions can be selected from metal halide lamps, high pressure mercury lamps and some fluorescent lamps (cold lights) as the light source. The exposure time is slightly different from the image quality due to the difference in the range of illumination.
Maishi experts say that if we use the polyester screen mesh version, if the overexposure or underexposure will affect the screen. Correct exposure is a prerequisite for ensuring print quality. The correctly exposed screen can faithfully reproduce the original, avoiding unclear pattern lines and color drift in the dot overprint. Excessive exposure can cause "light diffraction", affecting the edge definition and resolution of the screen image; underexposure is a common occurrence.、
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