The thickness of the film switch
The plastic substrate of a film switch with a thickness of 0.25mm or less is referred to as a film, primarily used as the panel layer of the switch. Its backside is printed with various indicative patterns and text to denote the operating areas of corresponding keys. The thickness selection should be determined based on the size of the panel and keys: thicker materials increase the force required for activation and slow down the response, while overly thin materials result in poor tactile feedback and weak rebound. A thickness exceeding 0.25mm is classified as a sheet material, which is unsuitable for three-dimensional key molding. It can be used for non-key-operated areas as an informative signage panel or as a backing layer to enhance the hardness of the film switch.
Circuit layer printing material:
The base material for circuit fabrication should be polyester (polyethylene terephthalate) film (commonly abbreviated as PET). It possesses excellent insulation and heat resistance, along with high mechanical strength, transparency, and airtightness. Notably, it also exhibits exceptional flexibility, making it an ideal material for manufacturing film switch circuits.