Marco at NEC-CPI wrote


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Hi Guys,

I have a problem with dimensional stability of photo tools.  The photo
tools shrink after processing.  I've tried increasing the drying
temperature (50-55C) just so it will not shrink but it still does.  This is
really giving me a headache.  Any suggestions?


Marco Biagtan
NEC-CPI Process Engineer

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The problem with silver halide film is it's dimensional stability to humidity
changes.  Silver film specs quote dimensional stability to be .012% per deg RH
 change over 24 inches, whereas the thermal coefficient is .0009% per deg F for
7 mil film.
The solution is to switch to a dry process system using dry plot film which has a thermal coefficient of .00085% per deg F for 4 mil film and a humidity
 coefficient of .0009% per deg RH.


Dick Desrosiers
[log in to unmask]

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