AllFlex in Northfield, MN has built 18-layer Type 5 circuits for CERN,  4.4
meter, almost 15',  overall length  Circuits were in thermoplastic
adhesive/Mylar  film construction but there's a means for lamination out
there, somewhere!

Lengths greater than platen press size are very difficult to produce.
Typical presses are on the order of 18" X 24" or a bit larger.  50" and
above is difficult.

T H Stearns
3 Brander Court
Nashua, NH 03063


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