Common FPC circuit membrane switch components
Time of issue：
1. FPC circuit membrane switch panel layer
The panel layer is generally made of exquisite patterns and text printed on colorless transparent sheet materials such as PET, PC, etc. less than 0.25MM. Because the main function of the panel layer is to play the role of identification and keys, the selected material must have high transparency , High ink adhesion, high elasticity, anti-folding and other characteristics.
2. FPC circuit membrane switch cushion rubber layer
The main function of the cushion rubber layer is to closely connect the panel layer and the circuit layer to achieve the effect of sealing and connection. The thickness of this layer is generally required to be between 0.02---0.05MM, with high strength and anti-aging properties; In production, special membrane switch double-sided adhesive is generally used. Some membrane switches require waterproof and high temperature resistance, so the cushion layer must also be made of materials of different properties according to needs.
3. FPC circuit membrane switch controls the upper and lower layers of the circuit
This layer is made of polyester film (PET) with good performance as the carrier of the switch circuit pattern, and silver paste carbon paste or gold paste is screen-printed on it with a special process to make it conductive, and its thickness is generally 0.05--0.175 Within MM, 0.125MM PET is the most common
4. FPC circuit membrane switch laminated layer
It is located between the upper circuit and the lower circuit layer and plays the role of sealing and connecting. Generally, PET double-sided tape is used, and its thickness ranges from 0.05 to 0.2MM; when choosing the material of this layer, full consideration should be given to the overall product Thickness, insulation, feel and tightness of the circuit key package.
5. Adhesive layer on the back of FPC circuit membrane switch
The use of adhesive is closely related to the material of the membrane switch. Common double-sided adhesives, 3M adhesives, waterproof adhesives, etc. are commonly used.
In addition to flatness and printing adaptability, the material of FPC circuit membrane switch must have flexibility and high elasticity.