Membrane switch is an operating system integrating key function, indicating element and instrument panel. It is composed of panel, surface glue, isolation layer, line room, line and back glue. The membrane switch has rigorous structure, beautiful appearance and good sealing. It has the characteristics of waterproof, high temperature resistance, dust prevention, radiation protection, corrosion protection, stable and reliable performance, light weight, small volume and long service life. It is widely used in electronic communication, electronic measuring instruments, industrial control, medical equipment, automobile industry, intelligent toys, household appliances and other fields.

1、 Panel layer

The panel layer is generally made by silk printing exquisite patterns and words on colorless transparent sheets such as pet and PC less than 0.25mm. Because the main function of the panel layer is to mark and press keys, the selected materials must have the characteristics of high transparency, high ink adhesion, high elasticity and high toughness.

2、 Surface adhesive layer

The main function of surface glue is to closely connect the panel layer with the circuit layer to achieve the effect of sealing and connection. Generally, the thickness of this layer is required to be between 0.05-0.15mm, with high viscosity and anti-aging; In production, special double-sided adhesive tape for membrane switch is generally selected. Some membrane switches are required to be waterproof and high temperature proof, so the adhesive tape must also use materials of different properties according to needs.

3插入女生视频、 Upper and lower layers of control circuit

This layer uses polyester film (PET) with good performance as the carrier of switching circuit graphics, and uses special process silk screen to print conductive silver paste and conductive carbon paste on it to make it have conductive properties. Its thickness is generally within 0.05-0.175mm, and 0.125mm pet is the most common.

4、 Adhesive layer

It is located between the upper circuit and the lower circuit layer and plays the role of sealing and connection. Generally, pet double-sided adhesive tape is used, with a thickness ranging from 0.05 to 0.2mm; When selecting the material of this layer, the overall thickness, insulation, hand feel and sealing of the circuit key package shall be fully considered.

5、 Back adhesive layer

The use of back glue is closely related to the material of film switch. Common double-sided adhesive, 3M adhesive, waterproof adhesive, etc. are often used.