What are the reasons for the bulging of the film panel surface

According to reports, the temperature that the film panel surface can withstand is generally 80 ℃ for 500 hours. In experiments and practical applications, when the ambient temperature exceeds 35 ℃, some parts of many panels will protrude, and most of them will be in critical or adjacent positions, which will cause the key switch to fail and affect the use of the switch.

At first, most people believed that the reason for the bulge was that the membrane switch was a very good tactile product, and as the switch temperature continued to rise, a spring was installed in the membrane key. The metal shrapnel may protrude due to the different expansion of panel materials, so improvements have been made to the thin film panel without using springs. However, we found that when the temperature rises again, the thin film panel still protrudes, and the temperature at this time does not exceed the temperature that the thin film panel can withstand, thus ruling out the cause of the protrusion caused by the metal spring.

The film panel factory has learned that another explanation is that the equipment itself is sealed, so people believe that as the temperature continues to rise, the pressure inside the box will increase. The continuous increase in internal pressure will directly act on the thin film panel through the reserved discharge holes and indicator light holes on the box, causing the PC layer of the panel to peel off and resulting in the panel protruding.

Therefore, remove the possible cause of the protrusion of the membrane panel caused by the membrane switch board on the membrane surface, change the sealing conditions, and then conduct temperature testing. It was found that the bulge still existed. Therefore, the protrusion problem caused by the combination seal has been solved.

According to reports, the temperature that the film panel surface can withstand is generally 80 ℃ for 500 hours. In experiments and practical applications, when the ambient temperature exceeds 35 ℃, some parts of many panels will protrude, and most of them will be in critical or adjacent positions, which will cause the key switch to fail and affect the use of the switch.

At first, most people believed that the reason for the bulge was that the membrane switch was a very good tactile product, and as the switch temperature continued to rise, a spring was installed in the membrane key. The metal shrapnel may protrude due to the different expansion of panel materials, so improvements have been made to the thin film panel without using springs. However, we found that when the temperature rises again, the thin film panel still protrudes, and the temperature at this time does not exceed the temperature that the thin film panel can withstand, thus ruling out the cause of the protrusion caused by the metal spring.