COATING
Piper coats by the Plastisol
Dip process and the Fluidized Bed process.
This process is suitable
for any substrate that can withstand the process temperature,
( e.g. Metal, Glass, Ceramic ) In both cases the part
is preheated to the process temperature, dipped, and finally
fused (cured).
The raw parts may be primed,
in which case the coating will adhere tenaciously to it. Unprimed
parts will be enveloped with about as much adhesion as a peel
to a banana. Most commercial parts are not primed.
Fluidized beds do not have
a distinct surface and so coatings do not end clearly, but
rather fuzz out. If a clean termination of the coating is
required, the parts must be masked or trimmed.
Coatings can be applied
to almost any surface, so long as it is reasonably clean (
light oil or rust may not be a problem). Any surface
that can take the heat is suitable including bare, powder
coated, painted, and all platings except zinc.
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Process Temp f
|
Prime(able)
|
Termination
|
Thickness
|
PLASTISOL
|
300 -450
|
YES
|
SHARP
|
.005"-.400"
|
PVC POWDER
|
350 -450
|
YES
|
FUZZY
|
.007"-.060"
|
NYLON
|
425 -500
|
YES
|
FUZZY
|
.007"-.030"
|
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Dip Moldings