Membrane switch is a key function, indicating device, instrument panel, an operating system.By the panel, rubber, insulation, line to line and line and back glue and other parts.Membrane switch structure is rigorous, beautiful appearance, good sealing.A waterproof, high temperature resistant, dustproof, radiation protection, corrosion resistance, stable and reliable performance, light weight, small volume, long service life, etc.Widely used in electronic communications, electronic measuring instruments, industrial control, medical equipment, automotive industry, intelligent toys, household appliances and other fields.
A, panel layer
Panel generally in less than 0.25 MM layer of PET, PC, such as colorless transparent sheet exquisite design and text on screen printing, because of the action of the main panel layer is the logo and key role, so the selection of material must have high transparency, high ink adhesion, high elasticity, high toughness, etc.
Second, the surface glue line
Rubber is the role of the main panel layer is closely linked with the circuit layer, to achieve the effect of sealing and connecting, the layer thickness of the general requirements between 0.05-0.15 MM, with high viscosity and the aging;In production, generally choose special membrane switch two-side glue, some can waterproof and high temperature membrane switch, so the surface glue also must according to the need to use different materials.
Three, the control circuit of the upper and the lower level
This layer adopt good performance of the polyester film (PET) as a carrier of the switching circuit graphics and printing on them in a special process on the conductive silver paste and conductive carbon slurry, has the conductivity, generally within 0.05-0.175 MM, the thickness of the most common is to use 0.125 MM PET.
Four, clip rubber
It is in the circuit and the circuit on effect of sealing and the connection between layers, generally used PET double-sided adhesive, its thickness is 0.05-0.2 MM;When choosing this layer