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May 1998

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Subject:
From:
Marco Biagtan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sat, 23 May 1998 09:04:15 +0800
Content-Type:
text/plain
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text/plain (111 lines)
Hi John,
Sorry guys if I misunderstood.  We do have a glass base over which the
films are laid and then this is covered by a rubber covering before vacuum
and exposure.
I have always checked the film dimension after developing; I haven't really
checked the dimensions of the film after exposure since only a latent image
is seen (we're using silver halide for our contacts), but I'll try.  We do
use overcoats over our films (PPF) but this is applied later during the
process.


John Waite wrote,
>
> Hi Marco,
>     What Paul is referring to is if the drawer has a glass base, and the
top side has a mylar.
> It sounds like you have a "glass pac" style tooling.  AT what point do
you see the "distortion".
> Is is off the diazo developer or during exposure, or after transfer of
the phototool to imaging
> area.  Also, are you using a covercoat over your diazo (IE- APF,PPF,
etc).  Sorry about my
> misinterpretation.  I thought you were using 1st generation silvers.
JOHN WAITE

>
> Marco Biagtan wrote:
>
> > Hi Paul,
> > I'm sorry but I don't quite understand what you mean about the single
sided
> > glass exposure frame.  The flexible membrane of our exposure machine
has a
> > thin glass frame on top of it as well as a thick glass frame where we
lay
> > our films.  Is this the same?
> >
> > Anyway, thanks a lot for the suggestion.  This is the first time I've
heard
> > of this and it might just be what I'm looking for.
> >
> > Marco Biagtan
> > NEC Components Phils. Inc.
> > Process Engineer
> >
> > Paul Gould wrote:
> >
> > > Marco,
> > > Just had another thought if it is only your contacts. If you are
using a
> > > single sided glass exposure frame with a flexible membrane over the
top,
> > > your copy film will be in contact with the membrane and will tend to
get
> > > mechanically stretched. This would result in an apparent shrinkage
after
> > > exposure. If this is a possibility, put a sheet of black card on top
of
> > > the film before closing the lid and pulling the vacuum.
> > > Hope this helps.
> > > Paul Gould
> > > [log in to unmask]
> > > Teknacron Circuits Ltd
> > > Fax: 1983 865141
> > > Tel: 1983 866531
> > >
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