Hi Bob,
Do you have typical numbers for expansion / contraction for film materials
with respect to temperature and humidity and maybe even age ?

Ahne Oosterhof,
A-Laser, Inc


-----Original Message-----
From:   TechNet [mailto:[log in to unmask]] On Behalf Of Bob Seyfert
Sent:   Thursday, August 06, 1998 14:27
To:     [log in to unmask]
Subject:        Re: [TN] Film Stabilization

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.
>[log in to unmask]

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################