In order to further improve the water resistance of the screen printing plate made after printing; friction resistance, solvent resistance and increase the strength and fastness of the screen printing plate, improve the printing resistance, usually using double exposure method The screen printing plate is hardened (in addition to the double exposure method, there are also drugs that harden the screen printing plate). The double exposure time is usually determined according to the actual situation of the screen, including many factors such as the selected screen and the thickness of the coating film. Generally, the second exposure time is about one to three times the one exposure time. 'The screen printing plate is hardened and is suitable for mass printing and single-use screen printing plates. Under what circumstances can the screen printing plate not be screen hardened? The first is that the screen printing plate can not be hardened in small batch printing. Secondly, in the case where the screen printing plate is prepared for stripping treatment) and the screen printing plate is reused, the secondary exposure hardening treatment cannot be carried out, otherwise it will cause difficulty in stripping.
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