Among the decisive factors in favor of membrane keyboards are both protection from water and dust and the sealing of the inside of the device against every type of external influence.
The keyboard/casing combination is conventionally sealed by inserting sealing cords or mounting cellular rubber seals.
Hoffmann + Krippner have developed an efficient and favorably priced solution as an alternative to this complex procedure.
A CNC-controlled dosing plant applies silicon (or in the case of the automobile industry the requisite silicon-free polymers) to exact positions of metal carrier parts, circuit boards and casings.
There is no need for the expensive groove for seal cords and their time-consuming processing.
In the Hoffmann + Krippner process, electrically conductive and non-conductive materials can be used and the height and width of the silicon strip can be varied.
Crevices around threaded bolts, cut out areas etc. can easily be complied with.