The panel layer is typically printed with exquisite patterns and text using colorless light board filaments like PET and PC, which are less than 0.25mm thick. The primary function of the panel layer is for logos and buttons, thus the material must possess high transparency, strong ink adhesion, high elasticity, and high tensile strength.

The primary role of the surface paste is to tightly bond the panel layer with the circuit layer, achieving both sealing and connection effects. This layer typically ranges in thickness from 0.05 to 0.15MM and requires high viscosity and aging resistance. During production, a thin-film panel double-sided adhesive is commonly used, and some thin-film switches require waterproof and high-temperature resistance, so the paste should also be made from different materials based on the need.

Control circuit parent and child items

This layer utilizes high-performance polyester film (PET) as the carrier for switch circuit graphics, and it is printed with conductive silver paste and carbon using special processes to achieve conductivity. The thickness typically ranges from 0.05 to 0.175MM, with 0.125MM PET being common. The adhesive layer is positioned between the upper and lower circuit layers, serving as a sealant and connector, usually made with PET double-sided adhesive, with a thickness of 0.05 to 0.2MM. When selecting this layer material, overall product thickness, insulating properties, circuit tactile feedback, and sealing are all crucial considerations.

Back adhesive

The use of adhesive is closely related to membrane switches and certain materials, with commonly used types typically including double-sided tape, 3M tape, and waterproof adhesive.