Introduction to Common Faults and Maintenance of Membrane Switches (Part 1)

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2021-06-01

Thin-film switch

       Thin-film switch The application scope is quite broad, and I'm sure everyone is well aware of the importance of quality. Even occasional quality issues can pose significant challenges for manufacturers, leading to immeasurable losses. Therefore, I'd like to share with you common problems encountered during the use of membrane switches along with their effective solutions, helping users resolve these issues and ensuring customers enjoy peace of mind throughout the process.

1. The button has cracked

It is common to see that many button areas of membrane switches crack after being used for a period of time. The panel materials typically used for membrane switches include three types: PVC, PC, and PET.

Polyvinyl chloride (PVC) is resistant to temperatures ranging from -20°C to 60°C and remains stable under normal conditions when exposed to acids, bases, and salts. It exhibits good flame resistance and excellent electrical insulation properties; however, its thermal stability is relatively poor. PVC is commonly used for key panel applications. Under prolonged use—especially during summer or winter—excessive pressing can lead to cracking of the keys. As a result, PVC is now rarely employed as a key panel material in membrane switch manufacturers.

PC (polycarbonate) offers a temperature resistance range of -60°C to 120°C, with exceptional performance in bending, tensile strength, and compressive strength. It also exhibits excellent thermal stability, cold resistance, electrical insulation properties, and resistance to atmospheric aging. However, it has poor chemical resistance, particularly toward organic solvents. Excessive pressing by users with sweaty hands can easily lead to button cracking. Additionally, when the button panel is cleaned using organic solvents, immediate cracking occurs upon pressing. Polyester (polyester), on the other hand, withstands temperatures ranging from -60°C to 180°C and demonstrates superior chemical resistance, remaining insoluble in common organic solvents. It boasts outstanding abrasion resistance and friction resistance, especially excelling in flexural strength and high elasticity. Its tensile strength rivals that of aluminum films, significantly surpassing both PC and PVC materials, making it an ideal choice for manufacturing membrane switches. In fact, 95% of the key panel materials used in membrane switches are made from polyester.

2. It is a short circuit.

The jumper wire lacks sufficient strength. After a period of use, the insulation layer is damaged, leading to short circuits. During the printing process, bubbles and impurities may form within the insulation layer, resulting in inadequate insulation thickness or insufficient UV intensity, both of which compromise the insulation's effectiveness. Therefore, it is crucial that the UV light immediately dries the insulation layer during printing. Additionally, if the button fails to return to its original position, this mechanical issue can also cause functional short circuits.

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