Membrane switches waterproof

Membrane switches keypad need to be waterproof, starting from the material.first , the graphics overlay layer needs to use good quality polycarbonate (PC) or polyester (PET) film raw materials, the thickness is between 0.125 and 0.25 mm, and the membrane panel The layer needs to print characters, patterns, etc. Good raw materials are only the first step to realize the waterproofing of membrane keyboard switches. Secondly, for the production of the circuit layer, the circuit layer needs to be made of good polyester film, and its thickness is generally between 0.1mm and 0.188mm. The circuit is printed with conductive silver. When using the labyrinth lower circuit as the switch circuit , the upper circuit is only a conductive contact. On the circuit surface, including the tail circuit, a layer of waterproof insulating layer needs to be applied, and a protective film adhesive is pasted on the tail circuit. Both the upper circuit and the lower circuit must have a waterproof adhesive layer. The membrane switch panel must be made into a waterproof frame. Finally Embed the circuit inside the membrane switch panel. It ensures the integrity of the switch and prevents moisture from corroding the interior of the circuit.

In addition to the circuit, the bottom adhesive must also be waterproof. The back glue makes the membrane switch keyboard and the equipment stick together tightly. Its viscosity is very important, and its waterproofness is also very important. Usually, the waterproof adhesive type is 3MVHB. If the adhesive is not waterproof, the membrane switch will leak from the instrument when it encounters water dropping, the device will cause the device to malfunction. The waterproof function of the membrane switch must be waterproof both from the inside and the outside.

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