Marco Biagtan wrote:-
>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?
>
Hi Marco,

It is important to pre-stabilise the film before plotting. If it is
taken straight from the packet and plotted you will have problems. If
you can take the film out of the packet and let the air get to it for at
least a couple of hours (ideally 24 hours) in your stabilised
environment you should minimise any movement after plotting.

What kind of shrinkage are you seeing. We generally consider we are
doing well if we get less than 0.025mm over 500mm which is 50ppm. The
difficulty is accurately measuring the error to that degree of accuracy.

Best Regards
Paul Gould
[log in to unmask]
Teknacron Circuits Ltd
Fax: 1983 865141
Tel: 1983 866531

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