AHHH, The age old issue of registration rises its' ugly head again.
The general criteria for film is to produce and use under the same
environmental conditions. sounds simple huh (NOT).
Many factors will effect the stability of your film. I will list a
couple of things off the top of my head) and I'm sure that many others have
ideas as well.
1) Are you using a 7 mil film or a 4 mil.. Make sure it is 7.
2) are you producing your film on site or having it plotted off site. If
you rely on an off site operation, you have no real control.
3) is the film stabilized for 24-48 hours before use in the plotter
area/contacting areas and "fan" the film several times. Repeat a couple of
times during the day.
4) Is the processor in control in regards to temperature, and has a
compensation been made in the sizing of the film to accommodate any
"natural" (gawd, I hate to use that word in this situation)
growth/shrinkage.
5) How is the film transported from plot to image (kinda goes with above).
The temp and humidity variations will play a MAJOR factor. Make sure the
plot, dev., inspection, and image areas are tied together and in
specification at all times (68 deg, 50%).
6) There are some films out there that claim a higher stability (I don't
like to mention names in public), but the price will be much higher also.
7) how many contacts are made from the plotted to the imaging film.
Minimize and try to use first generation silvers (if high production, may
need to coat emulsion)
8) check your local yellow pages, PC FAB, or call associates at other
companies for plotting services. If you are plotting outside, Do everything
possible to bring it in house.
If you tell the TechNet where you are from, someone might be able to
offer some names.
9) make sure that you are dealing only with film stability and not material
movement. Depending upon your process, any scrubbing, drill misreg, temp
exposures, etc. will have an affect.
If you want to Email me with your number, or request my phone number, we
can converse "offline" and I will mention more specifics in regards to
vendors and be able to understand any Matrixes/DOEs that you have already
run.
Registration can cause you to chase your tail easily, anyone that has
been in the industry for a while will testify to that (unless they are the
5% that didn't get caught by themselves in the closet). Good luck and
contact me if you would like me to confuse ( I mean help) you more. JOHN
WAITE
-----Original Message-----
From: Zhong-You Shi <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, April 02, 1998 4:32 PM
Subject: [TN] Photo mask
>My name is Joe Shi. I am very new in this field. My project at Ford Motor
>Company involves photo imaging. We are not happy with our current
>contractor who does our artwork ploting on Mylar. Could anyone of you
>recommend some best suppliers that can do a better job? Also we are
>concern about the expansion or shrinkage of the Mylar artwork
>with humidity and temperture flatuations. Could anybody suggest a better
>Mylar or a better polymer for UV (380nm) printing?
>In order to overcome the shrinkage and expansion of the Mylar artwork we
>are considering to use glass mask as a back up plan. Do you
>know anybody who can plot a 38 x 62 inches mask?
>If I try to control the printing-room's humidity and temperature to some
>degree can the Mylar's shrinkage and expansion problem be solved?
>Any help is greatly appreciated!
>
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