Manufacturing Process of Membrane Switch

The process of membrane switches or membrane keyboards are divided into four parts: film design, Silk screen printing that is offset , Mesh board making and assembly. 

Mastering the operation technology of each process can ensure perfect printing quality.

 In the membrane switch design, the designer must be familiar with the plate making and printing process, as well as the post-press assembly technology, whether the clearly designed membrane switch meets the requirements of plate making and printing process. For the design of general membrane switches, the requirements are simple and clear, suitable for printing; for some high-end products with special design requirements, it is necessary to organize special personnel to solve the problems after the post-assembly assembly, and try to meet the requirements of customers and designers. Since the printing and use materials of the membrane switch are completely different from those of general books and periodicals, in the design of screen printing, the materials used in the membrane switch and the printing process should be fully considered.

Silk Screen printing plate often encounters the need for hollowing and inlaying. In particular, the artwork needs bright colors or gold and silver. The plate must be made into a hollow mosaic, otherwise it will easily cause the color to darken, the amount of gold and silver is insufficient problem.

Membrane switch factory membrane switch screen printing, the common use of direct plate making method, the direct process of making the screen with the emulsion is: screen degreasing → screen drying → coating photosensitive glue → stencil drying → template refilling → stencil drying → Exposure → Development → Stencil Drying → Check the revision. The screen adhesive layer must be uniform, the emulsion completely covers the screen, and the adhesive layer on the printing surface should be thicker.

The screen printing surface is first coated with glue for 1 or 2 times, and then immediately applied to the surface of the scraping surface for 1 to 2 times, wet and wet, and then dried. After drying, the coating surface is further coated 2 to 4 times, and the offset surface is coated 2 to 4 times to make the photosensitive layer reach the final desired thickness. Each time the glue is applied, it must be done after the previous layer is dried. The number of times of application is determined by the printing requirements and the fineness of the screen.