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February 1999

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Subject:
From:
Evan D Jones <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 5 Feb 1999 15:23:07 +1000
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text/plain
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Richard,
     I recall having the same problem ourselves a couple of years ago.
Cards that had peelable mask preapplied would harden through reflow to the
extent that the mask was almost impossible to remove. Checking the reflow
profile showed no reason to suspect abnormal heating. It would seem the
mask was designed to cope with wave solder but not reflow.
One solution is to apply a selective mask post reflow/pre wave, which we do
for some parts/areas needing masking. This can be done by hand, or by
selective masking equipment such as Camelot or Asymtek selective coating
systems (although you need to have a resonable volume of product to justify
the cost of buying one).
The other solution is to talk with the vendor to see what conditions the
mask should be used under.

Regards Evan

Evan Jones
Manufacturing/Test Engineer
Bluegum Technology Pty Ltd
PO Box 609, Wangaratta, Australia, 3676
Ph: 61 3 5720 2539     Fax: 61 3 5720 2412
Internet:  [log in to unmask]




"Hamilton, Richard -4454" <[log in to unmask]> on 05/02/99 05:30:55

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
      to "Hamilton, Richard -4454" <[log in to unmask]>

To:   [log in to unmask]
cc:    (bcc: Evan Jones/BGT)
Subject:  [TN] Peelable mask




Hello all,

I wanted to get a 'heads up' on a possible problem so I asked this several
months ago and got no reply. I thought, Great! This is not a problem!!

Well, not so sure now. The peelable masking we are using on our PWB's seems
to be getting tougher to remove after reflow process has been added to the
system.

Anyone have any suggestions, guidelines, or other input on what to look for
or what to look out for? We will have to start looking at other vendors for
the masking. Sorry but I cannot tell you the mfgr right now, our PWB
designer is out today. If this information is needed, let me know and when
I
get it I will let you know.

Thanks gang.

Richard Hamilton
Clemar Mfg. / Rain Bird
[log in to unmask]

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