Comments forwarded from Sam Henson at ADFlex Solutions. (602) 786-8403


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Subject: RE: Interleaves and cleanroom NO
Author:  ADFLEXCH (SHenson)
{NAME:SHenson|EMS:INTERNET|MBX:[log in to unmask] at
MCIMAIL
Date:    10/30/95 1:32 PM


Joe Hervey has some interleaf samples we are trying. They aren't clean room
paper but they are reasonably low lint. we use tacky rollers before coating
resist. The clean room particle counts are not necessarily going to  result
in an increased defect rate. We find that the process (coating resist and
trimming) causes most of the dirt that causes defects. The debris isn't
airborne. On very fine lines there is some increase in defects but the
process caused is still greater.
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From:
internet!mcimail.com!AndrewPM_+a_Rogers-M_+lAndrew_P_Magee+r%ROGERS_CORPORAT
ION
To: Sam Henson
Subject: Interleaves and cleanroom NO
Date: Monday, October 30, 1995 10:04AM

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     From the IPC TechNet.


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Subject: Interleaves and cleanroom NO
Author:  HUNTR (Robert C Hunt) {NAME:Robert C
Hunt|EMS:INTERNET|MBX:[log in to unmask] at MCIMAIL
Date:    10/27/95 9:13 PM


   I have two minor questions for those of you with more experience.

   1) I have been carrying my layers around standing on edge in racks, which
   is causing some handling damage as I go to larger panels.  I am
   considering laying them flat between processes, but I think I need
   something to interleave the layers.  It should be cleanroom compatible
and
   durable and shouldn't contaminate the material.  I looked at regular
   cleanroom paper, but the stuff we use has an oil base.  Tyvek looks
   promising, but pricy.  Does anyone out there interleave like this?  What
   do you use?

   2) We've just set up a 100K cleanroom to perform all of our
   photoprocessing in.  We did it because that's what 'everybody' said is
the
   best way to reduce contamination and improve yield.  My question is; what
   impact does exceeding the 100K particle count have on parts?  Is it just
a
   yield reduction that will show up on my AOI?  If I find that I've
   processed out of tolerance, should I track down the affected parts and
   pitch them or should I just monitor for increased scrap?

   I know there is no such thing as a stupid question, but I'm working on
it.

   Bob Hunt
   Boeing Electonics
   Manufacturing Engineering
   (206) 773-8670