What are the characteristics of the hierarchical structure of FPC circuit membrane switch from China
Time of issue：
2021-09-15
FPC circuit membrane switch from China is a set of key functions, indicators, instrument panels as one of the operating systems. The utility model is composed of a panel, an upper circuit, an isolation layer and a lower circuit. Usually, the upper and lower contacts of the membrane switch are open.
The following FPC circuit membrane switch manufacturers introduce the layered structure of membrane switches: Membrane switches have good waterproof, dust-proof, oil-proof, anti-harmful gas erosion, stable and reliable performance, light weight, small size, long service life, easy installation and connection , Panel cleaning without damage and other characteristics, rich colors, beautiful and generous. A transparent sheet whose size is less than 0.25mm, such as pet or pc, is usually made of colorless transparent sheet, and the selection of material must have the characteristics of high transparency, high ink adhesion, high elasticity, and folding resistance. The main function of the buffer layer is to connect the panel layer and the circuit layer to achieve the effect of sealing connection. The thickness of this layer should be between 0.02-0.05mm, with high viscosity and anti-aging properties.
FPC circuit membrane switches from China usually use special double-sided plastic membrane switches. Some membrane switches require waterproof and high temperature resistance, so gaskets must also use materials with different properties as needed. The upper and lower layers of the control circuit use pets with good performance as the carrier of the switch circuit, the upper layer is printed with silver paste or gold paste, and the silver paste has conductivity by using special process wires. The thickness of silver paste is generally 0.05-0.175 mm, and the most common is 0.125 mm. The middle layer is located between the upper and lower wire layers and acts as a sealing joint. Pet double-sided tape with a thickness of 0.050.2 mm is usually used. When choosing layers, the overall thickness of the product and the insulation, feel and sealability of key circuit packaging should be fully considered. The use of adhesive layer and adhesive film switch is closely related to sticking materials, ordinary double-sided adhesive, 3m adhesive, waterproof adhesive, etc.
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