Fabrication process of membrane switch

The process flow of the membrane switch is divided into four parts: film design, screen making, screen printing and assembly. Only by mastering the operation technology of each process can the printing quality be guaranteed.

In the design of membrane switch, the designer must be familiar with plate making and printing process, as well as post press assembly technology, and be clear whether the designed membrane switch meets the requirements of plate making and printing process. For the design of general membrane switch, it is required to be simple and clear, suitable for printing; For some products with special design requirements, special personnel must be organized to tackle key problems during post press assembly to meet the requirements of customers and designers. Because the printing and use materials of membrane switches are completely different from those of ordinary books and periodicals, the characteristics of membrane switches such as materials and printing technology should be fully considered in the design of screen printing. Screen printing and plate making often encounter the need for hollowing out and inlaying process methods, especially if the drawings need bright colors or gold and silver, the printing plate must be made into hollowing inlaying plates, otherwise it is easy to cause problems such as darkening of color, insufficient amount of gold, silver and ink.

The film switch screen plate is generally made by direct plate making method. The process flow of making screen plate directly with photosensitive emulsion is as follows: screen degreasing → screen drying → coating photosensitive adhesive → template drying → template supplementary coating → template drying → exposure → development → template drying → inspection and revision. The photosensitive adhesive layer of the screen plate must be uniform, the emulsion completely covers the screen, and the adhesive layer on the printing surface should be a little thicker. The screen printing surface shall be coated with glue for 1-2 times, and then the scraping surface shall be coated with glue for 1-2 times immediately, wet to wet, and then dried. After drying, the printing surface shall be coated for 2-4 times, and the scraping surface shall be coated for 2-4 times to make the photosensitive adhesive layer reach the final required thickness. Each adhesive coating must be carried out after the previous adhesive layer is dry. Gluing times are determined by printing requirements and screen fineness.