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It doesn't work that way. The PCB square area receives the pressure
direct. (Like pounds per square inch) You can put close to the same
panel sizes in the press. (Like 14 X 18 in one opening and 16 X 18
in another) Check with your laminate supplier. They should have a
recommended pressure range for lamination. Work within that range to
achieve the pressures. Like 18 X 24 at 200 PSI and 16 X 18 at 300 PSI
in the same press. An important note to mention is that if you do
controlled impedance work, your dielectric thickness' will be all over
the place. (variance) Also, you will see dimensional stability
differences. (growth or shrinkage) Be sure you look downstream at
any potential changes you may create.
Groovy
______________________________ Reply Separator _________________________________
Subject: FAB: Lamination
Author: [log in to unmask] at SMTPLINK-HADCO
Date: 9/16/96 8:08 AM
Does any PCB manufacturer has an experiance with lamination proccess of
mixing different board sizes into different openings of the press in the
same cycle (using same size of press plates and seperators)?
Shabtay Shalev
Engineering
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