Hi Doug,

I'm kind of thinking like Jerry in that you could vacuum form a plastic over
the top of a board. You may have to scrap a board and drill a bunch of holes
in it for the vacuum to work. Drill a populated board, fixture it up in a
vacuum form machine, heat up the plastic and form it over and all around the
components. Remove the new plastic cover and make another one. You might
have to figure out a way to seal it around the edges but it might just work.

I've done some things in the past with vacuum forming that were incredibly
intricate and accurate. Sounds like a fun project.

KennyB

-----Original Message-----
From: Jerry Dengler [mailto:[log in to unmask]] 
Sent: Friday, July 17, 2009 8:02 AM
To: [log in to unmask]
Subject: Re: [TN] Shrink Wrap a Board

I once saw a product that had a separate plastic cover that was vacuum
molder to fit closely over the PCB.  It was not molded to the PCB but
was molded to a model that had been made of the PCB.  In that
application they actually glued the cover at the corners to the PCB
after it had been screwed down to the enclosure.

They said it was for the same reason you give, to keep a stream of water
from directly contacting the PCB. 

I do not know where they had it done but I think getting a good model
would be the hardest part.

Good Luck,

Jerry Dengler

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Friday, July 17, 2009 10:53 AM
To: [log in to unmask]
Subject: [TN] Shrink Wrap a Board

Good morning all,

Now that we have thoroughly established most of us are ugly and don't
want our pictures bandied about, I have a question.  And Friday seems to
be a time for silly questions, so here goes.

Have any of you ever seen a product that essentially vacuum forms a
plastic film over the surface of an assembly?  Not a chemical vapor
deposition like Parylene or conformal coat process.  For a particular
(really odd) application, I want to put a rain guard on the surface of
an assembly.  Something where I could take a squirt gun and shoot water
at the assembly and never have it hit the surface (of the assembly). 

Don't ask why.

Doug Pauls


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