How to prevent windows from being scratched by membrane switches

How to prevent the windows from being scratched by the membrane switch, the connection between the membrane switch and the display window, and the user’s requirements on the transparency of the windows are very strict, and no defects are allowed, in particular, users sometimes use the quality of the glasses to check the display window of the membrane switch. Remember someone said that the user is always right, how do we control the window membrane switch? First of all, we should have a high degree of quality awareness, strict control of all production links. The window and the key of the membrane switch are a whole, the key production process is complex, the flow is many, every production link of the membrane switch must consider to protect the window from scratch. Control of raw materials, transparency and scratch test level of purchased raw materials. For the material selection of the membrane switch with the display window, must choose anti-scratch material, the front anti-scratch grade is particularly important, the raw material purchased is a certain material on both sides have a protective film, when the material is scratched, will not cause damage to the material, the material choice is improper, the window scratches are difficult to control. In a printing environment, printing is usually done in a dust-free workshop, dust-free is only relative, semi-automatic screen printing, window exposure time is longer, especially when there are many color film switches, we can consider the second process of windows on the printing of water-based protective paint, so that subsequent printing process can protect windows from dust damage, and then after the last process with protective film cover windows. Automatic printing each printing process must be covered with protective film, at the same time note that rubber can not adhere to dust particles to prevent window scratches.

Standardized operation, every step of the production process, must not be allowed to touch the window area, at the same time prohibit cleaning the window. Both cover the window with their fingers, leaving marks, and then gently wipe away any possible damage. Film switch production involves a large number of mold, mold window area must be smooth and bright, in the production process to check whether there is debris on the mold to prevent extrusion window. Screen surface to pay special attention, can not have trachoma, prevent screen surface oil leakage. The finished plate after printing must be double-sided compound glue assembly link. Usually after the circuit assembly is completed, do the last process paste panel, remove the back of the protective film paste panel, paste immediately after the window area covered with protective film. Of course, after strict production control, the windows are still defective. The following criteria are for reference only: Scratch area 0.08 mm × 2cm not more than 5, scratch area 0.08 mm × 3cm not more than 2, scratch area 0.08 mm × 1cm not more than 10, scratch area not in the center of the window. (check area: 90m × 50mm, according to the increase or decrease of area, the acceptance standard should be adjusted accordingly) , the standard of black spot, stain and miscellaneous spot: diameter 0.1 mm or less, not more than 3, diameter 0.05 mm or less, the defect area is not in the center of the window. The area of this standard panel is 180 × 170 mm. The Acceptance Standard is adjusted according to the increase or decrease of the area.