Membrane switch design quality leap to the leading level of soft membrane switch
Membrane switches are an operating system that integrates key functions, indicating elements, and instrument panels. Characteristics of anti-humidity, long life and so on. Now it has a wide range of applications in electronic communications, electronic measuring instruments, industrial control, medical equipment, automotive industry, smart toys, household appliances and other fields. Membrane switches have become an important part of many electronic products. With ergonomics and aesthetic design becoming more and more important in electronic products, Chinese membrane switch manufacturers are working to develop products with higher brightness and richer patterns to cope with the growth in demand. Today, We mainly introduce the material types and material thickness of the membrane switch.
Membrane switch material types: PVC PVC60 °C [NULL]. 175 ~ 0.5 / smooth room temperature at acid, alkali and salt stability. Good wear resistance, flame resistance, self-extinguishing, noise reduction and vibration elimination, good electrical insulation. Poor thermal stability. Cheap ordinary signs, panels. Polycarbonate PC-60~120°C[ NULL ].175~1.0 Glossy light transmittance, low water absorption, good dimensional stability, excellent bending, tensile, compressive strength, heat resistance, cold resistance, Electrical insulation and weather resistance are excellent. Poor fatigue resistance, easy to produce stress cracking, output interface circuit is generally made of carbon printed material, and there is no protective coating, gradually formed by the air oxidation shedding layer, to the end of the lead to an open circuit and end of life, which is the membrane switch The places that are prone to failure are mainly determined by the environment. Physical or mechanical damage takes 3-10 years, regardless of whether it is used or not. The general scope of application is wide, except that it can meet the requirements of most membrane switch panels, in which the high transmittance of glossy PC can meet the requirements of LCD display windows.
Sand Surface Polyester (PET) -30~120°C[NULL].1~0.2 Smooth Surface Good resistance to essentials, insoluble in common organic solvents, not alkali resistant. Has excellent mechanical properties, electrical properties, rigidity, hardness and toughness in thermoplastics, low water absorption, abrasion resistance, excellent abrasion resistance, high dimensional stability. Tensile strength can be comparable to aluminum film, much higher than PC, PVC. Due to the fact that the surface is difficult to process into a matt type, texture PET is more expensive. It is an ideal substrate for making a membrane switch circuit. Among them, textured PET is suitable for products with higher surface requirements or liquid crystal display windows.
Membrane switch material thickness: Plastic substrate thickness of 0.25mm and below is called film, is mainly used as the membrane switch panel layer, on the back of which is printed with a variety of indicative patterns, text to indicate the corresponding key operation area, in Thickness selection should be based on the size of the panel and the key, thick material, increased power, unresponsive; material is too thin, feel bad when touched, rebound is not obvious. Thickness of more than 0.25mm is called plate, not suitable for stereoscopic key forming, can be used as an indicative sign panel without key operation area, and can also be used as a membrane switch liner to increase its hardness.
Line layer printing materials:
The substrate used to make the circuit should be a polyester (polyethylene terephthalate) film (Potyester referred to as PET). It has good insulation and heat resistance, has high mechanical strength, transparency and airtightness, in particular, it has flex resistance and high elasticity, and is an ideal material for making a membrane switch circuit.