Holland Membrane, Design Manual

Page: 11 / 23

11
Always clean the surface before installing a membrane switch. If alignment is
difficult, we recommend that you remove a small corner of the backing, align the
membrane switch, stick the corner down, bend back the membrane switch and remove
the rest of the liner. NEVER bend a membrane switch in an LED or dome area. After
the membrane switch is correctly located, rub it down with firm pressure. The adhesives
we use are called pressure sensitive adhesives because they need pressure to insure a
strong bond. The adhesive will continue to cure for many days. It will have reached 90
percent of its ultimate bond within 72 hours under most conditions. No testing of the
adhesive should be done within 72 hours of installation.
Subpanels
In some applications it is desirable to have Holland Nameplate supply the
membrane switch mounted to a rigid subpanel. The most commonly used material for
such subpanels is aluminum. These subpanels can be supplied with a variety of
hardware installed.
It is important to keep in mind that the subpanel must have different mechanical
dimensions to allow for assembly tolerances. The subpanel should be .020" smaller
than the membrane switch in both height and width. All cutouts and holes should be
.030" larger. Cutouts behind windows should be .060" larger than the window. These
general guidelines are intended to help insure that the subpanel is not visible after
assembly.
Backlighting
We offer several backlighting solutions for viewing legends in no light and low
light applications. The most common backlighting methods used are fiber optics,
electroluminescent panels, and LEDs. Fiber optics and electroluminescent panels offer
the advantage of uniform light over a large area.
Drawings and Specifications
Our ability to manufacture a switch which meets our customer’s expectations is
dependent on how well we understand our customer’s requirements. The customer
should be sure to supply us with as much detail about his design requirements as
possible. Appendix “B” is a checklist of issues that should be addressed in
communicating a customer’s complete requirements. It is helpful for the customer to
supply a copy of this checklist with notes on topics not covered elsewhere in this
documentation. Additionally, there Is no substitute for a detailed engineering drawing