What are the characteristics of the hierarchy of quality FPC membrane switches
Time of issue：
The quality FPC membrane switches are a set of key functions, indicators, instrument panels as one of the operating systems. quality FPC membrane switches consist of panel, upper circuit, isolation layer and lower circuit. Usually, the upper and lower contacts of the membrane switch are open. The following quality FPC membrane switches manufacturers introduce the layered structure of membrane switches.
The quality FPC membrane switches have the characteristics of good waterproof, dustproof, oilproof, anti-harmful gas erosion, stable and reliable performance, light weight, small size, long service life, convenient installation and connection, no damage to panel cleaning, rich colors, beautiful appearance .
The quality FPC membrane switches is a transparent sheet with a size less than 0.25mm, such as pet or pc, usually made of colorless transparent sheet, the choice of material must have high transparency, high ink adhesion, high elasticity, folding resistance Features.
The main function of the quality FPC membrane switches 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. Usually special double-sided plastic membrane switches are used. Some membrane switches require waterproof and high temperature resistance, so the gasket must also use materials with different properties as needed.
The upper and lower layers of the control circuit of quality FPC membrane switches use pets with good performance as the carrier of the switching circuit, the upper layer is printed with silver paste or gold paste, and the silver paste has conductivity with 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 of quality FPC membrane switches 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 of quality FPC membrane switches is closely related to the pasting material, ordinary double-sided adhesive, 3m adhesive, waterproof adhesive, etc.