Panel layer is generally less than 0.25MM of PET, PC and other colorless transparent sheet silk screen printed on the beautiful patterns and text made of, because the main role of the panel layer from the role of identification and buttons, so the choice of materials must have high transparency , High ink adhesion, high elasticity, high toughness and so on.
The most important role of the plastic surface is connected to the circuit layer and the panel layer is closely linked to achieve the effect of sealing and connection, this layer generally requires a thickness of between 0.05 --- 0.15MM, with high viscosity and aging resistance; in the production In general, the choice of special double-sided plastic membrane switch, and some membrane switch to waterproof and high temperature, so the plastic must also use different materials as needed.
Control circuit upper and lower
This layer are using good performance polyester film (PET) as a switch circuit pattern carrier and on which a special screen silk printed on conductive silver paste and conductive carbon paste, so that it has conductive properties, and its thickness is generally 0.05 - Within 0.175MM, the most common is 0.125MM PET.
It is in the upper circuit and the lower circuit layer and plays the role of sealing and connection, the general use of PET double-sided adhesive, the thickness of 0.05--0.2MM range; in the choice of this layer of material should give full consideration to the product as a whole Thickness, insulation, circuit button package feel and sealing.
Back adhesive layer
Beijiao use and membrane switch with the material which is closely related to the paste, the more commonly used are ordinary double-sided adhesive, 3M plastic, waterproof plastic and so on.