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Easy to get to know the membrane switch used in our daily life related knowledge

- Aug 14, 2017 -

Membrane switch is use polyester (poly phthalic acid glycol ester) made of thin film.It has good insulation and heat resistance, and has high mechanical strength, transparency, and air tightness, especially with the folding resistance and high elasticity.The material of membrane switch, panel, in addition to the requirements with smoothness and printing adaptability, more major is to has the characteristics of flexible and high elasticity.

PVC, 60 ℃, 0.175 ~ 0.5 / smooth surface, stable to acid, alkali and salt under normal temperature.Good abrasion resistance, flame retardant from extinguish, silencing elimination, good electrical insulation.Poor thermal stability.Cheap ordinary signs, panels, polycarbonate (PC), to 60 ~ 120 ℃ and 0.175 ~ 1.0 \ smooth high light transmittance, low water absorption, good dimensional stability, bending, tensile and compressive strength is very superior, heat resistance, cold resistance, electrical insulation and good weathering resistance.Drug resistance is poor, poor fatigue resistance, easy to produce stress cracking.Generally the most widely application scope, besides can meet the requirements of most of the membrane switch panel, the smooth high light transmittance of PC is can meet with the requirement of liquid crystal display window.

Sand surface polyester (PET), and 30 ~ 120 ℃ and 0.1 ~ 0.2 smooth drug resistance is good, does not dissolve in organic solvents is not alkali resistance in general.With excellent mechanical properties, hardness, excellent electrical performance, rigid, and the largest of thermoplastics strong toughness, low water absorption, wear resistance, corrosion resistance, excellent grinding high dimensional stability.The tensile strength to be able to compete with aluminum film, compared with PC, PVC.Is low because of difficult processed into inferior smooth surface type, texture is a PET is more expensive to make the ideal substrate membrane switch circuit.There are PET is suitable for higher requirements for surface texture or with liquid crystal display window products.

Plastic base material thickness below 0.25 mm and called film, mainly used for membrane switch panel layer, imprint on the back of the pattern of indicative, word to represent the corresponding switch keying operation area, on the thickness selection should be depending on the size of the panel and buttons, material thickness, touch the power increase, slow;Material too thin, poor touches at the touch of springback is not obvious.Called plate thickness of 0.25 mm above, not suitable for 3 d key, can be used as a button operation area of indicative signs panel, also can be used for lining board membrane switch in order to improve the hardness.

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