Membrane switch quality testing is a very important task. Establishing a comprehensive quality assurance system is a top priority for a successful membrane switch company. In the membrane switch quality inspection work. In addition to paying attention to the color rendering of inks that network printing workers are familiar with and the color reproducibility of customers' requests, it is more important to pay attention to the intrinsic qualities of membrane switches, such as key operation force, longevity, peel strength, and high temperature and low temperature. , Constant temperature damp heat and loop Yin, insulation Yin, pressure and other testing indicators.
1. Membrane switch detection requirements
Appearance quality inclusions, stain inclusions, less than 2 / dm2. Inclusions, the length of the stain is not more than 1 mm. Do not accumulate, at least 50mm away from the scratch; scratches less than 1 / dm2, the length of the scratch is not greater than 20MM, the depth and width are not greater than 50um; scratches with a depth of not more than 1um are allowed.
The color of the same batch of products should be no significant difference, the color printing layer should have enough hiding power, and the color and structure under the reflected light should not be seen clearly; when printing the transparent ink layer, the overlapping portion of the two colors should not exceed 1 mm. The color deviation caused is allowed; the edges of printed characters and color patches are not clear or larger than 0.15mm.
Membrane switch size should be consistent with the provisions of Table 1, the membrane switch parallelism and perpendicularity of the two adjacent sides should meet the requirements, the lead wire with the center of the distance between adjacent conductors is generally 2.54mm. The
4. Peel strength
The peel strength of each adhesive layer of the membrane switch shall not be less than 8N/25mm.
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