Hi Marco,

It does not matter what temperature or RH you choose for your plotter room,
conditioning room, yellow room, etc -- provided that the conditions are the
same in all areas where the film is handled and used; and the conditions in
these rooms are not changing.  Pick conditions that are easy to control to
and comfortable to work in.  The film does need to be pre-conditioned and
plotted at the same temperature and RH as the yellow room where it will be
used.  Complete pre-conditioning requires 6-8 hours if you use a cabinet
designed to allow air to come into contact with both sides of the film
(open wire shelves - one sheet per shelf).  It will take considerably
longer under other conditions.  After post-processing conditioning requires
1-2 hours on open shelves.

Regards,

Bob Seyfert
Technical Manager - Phototools
DuPont Electronics






At 03:15 PM 8/6/98 -0400, you wrote:
>Hi everyone!
>
>I'm currently involved in the production of artwork for pcb manufacturing
>and one major problem that we have is film stability.  To my knowledge, raw
>films have to be pre-stabilized before use and again stabilized after
>processing at constant RH and temp (usually 55% and 23C) for 2 to 4 hours.
>If RH or temp increases, the dimension increase and vice versa.  But what
>if raw films are pre-stabilized at a lower RH (say 45%) and after
>processing these are stabilized also at the same RH.  Will the film still
>experience shrinkage even if it was stabilized at constant RH? (Same
>question also for Temp)
>
>If anyone can help me with this one, I'd appreciate it.  Thanks!
>
>Marco Biagtan
>Artwork Process
>NEC Components Philippines Inc.
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