Ultraviolet Hardcoats
The most durable hardcoats are those that are cured by exposure to ultraviolet light. These coatings are called UV
Embossing
In many applications it is desirable to emboss or hydroform the keys of a switch. The phrase “Plateau Embossing” is used to describe keys that are raised and flat on the top. The term “Rim Embossing” is used to describe raising only the border of a key. Embossing is typically .010" high and two dimensional.
Hydroforming can be used to attain higher embossments, up to
We have samples of both hydroforming and embossing on polyester and polycarbonate that will help illustrate the different results that can be attained. Contact a Holland Nameplate sales engineer to request hydroforming and embossing samples.
Cosmetic Inspection
In evaluating the cosmetic attributes of a membrane switch, it is important that the vendor and the customer have a common understanding of how the part will be inspected, and what the criteria for evaluation will be. To facilitate this Holland Nameplate has developed a standard cosmetic inspection specification. In the absence of a customer specification we will use this standard.
This standard is also useful in setting a standard format for specifying cosmetic inspection requirements. It is recommended that in cases where the customer desires to establish his own inspection criteria, the format of our specification be used.
The key requirements include viewing time, viewing angle, viewing distance, and defect size.
Mechanical Tolerances
Steel rule dies are usually used to fabricate the various layers of a membrane
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