How to deal with silicone key card?

For the silicone button, the card key is functioned poorly, which directly affects the quality and normal use of the product. There are many reasons for the key card key, there are reasons for the shell, there are also reasons for the silicone button, the following share the silicone button after the installation of some keys pressed but can not play the card key.

1. The key hole on the key panel has a cloak or burr
Note: Avoid the accumulation of silicone keys
Dust even falls into the debris

2. The silicone key type is large and irregular
Note: The pressing force should be in the center of the key
Solution: Loosen the screws slightly. < Increase the stud by 0.2mm>

3. The keys and the housing are too tight
Note: too tight easy to cause pcb deformation.

4. The gap between the silicone key and the panel is improper
Note: to control the gap < small gap will cause the card key, the gap assembly feel bad >

Suggestion:
1. The gap between the silicone button and the panel is set at 0.1 ~ 0.2mm
2. Need to spray oil, about 0.25 ~ 0.3mm
3. Electroplated parts generally need 0.3 ~ 0.4mm

5.. Silicone button stroke setting is improper
Suggestion:
1. The stroke of the button is set to 1.2 ~ 1.5mm
2. The bottom need to stick a film switch, the stroke of the key is set at about 0.3mm.

6. The load (elasticity) of the silicone button is low, or the resilience is low