What are the basic conditions for choosing a light source when making a screen printing plate?
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In the preparation of screen printing plates, the basic conditions for selecting a light source are as follows:
1 Light source intensity The light source used must have a certain intensity. For any type of original, it should be able to meet the exposure in a short time.
2 Stability requirements The intensity of the light source used must remain stable during the exposure process and should not be suddenly strong or weak.
3 Light source illumination uniformity The intensity of the light source used on the original must be the same. That is, the center of the original and the surrounding position must be under the same light intensity.
4 High efficiency The light source used should be exposed in a short time and can achieve the exposure effect.
5 Simple operation and maintenance The selected light source equipment is easy to operate and easy to maintain.
What is the significance of screen printing double exposure? How to master the double exposure time?
In order to further improve the water resistance of the screen printing plate produced by the printing, the abrasion resistance, the solvent resistance, the increase of the strength and the fastness of the screen printing plate, and the improvement of the printing durability, the double exposure method is usually used for the silk. The screen printing plate is hardened (in addition to the double exposure method, the screen plate is hardened by using a drug). The double exposure time is usually determined according to the actual conditions of the screen, including the selected screen, film thickness and many other factors. Generally, the double exposure time is about one to three times that of one exposure time. ' Screen printing plates are hardened for screen printing and high-volume screen printing. Under what circumstances can the screen printing plate not be subjected to screen hardening? The first is that the screen printing hardening process is not performed in small batch printing. Secondly, in the case where the screen printing is prepared after screen printing, and the screen printing plate is reused, the secondary exposure hardening treatment cannot be performed, otherwise the film removal may be difficult.