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US 4,732,636 AGranted
Method for producing a prepreg having improved dimensional stability
AssigneeInternational Business Machines Corporation
InventorKenneth J. Varker
Life of this patent
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Abstract
Shrinking of partially cured or B-staged resin coated fabric, also known as prepreg, during C-staging or full curing is reduced by cutting at least a plurality of the warp of the fabric in at least one location before C-staging. Prepreg is useful in the computer industry in the manufacture of printed circuit boards.
Claims14
A method for manufacturing substantially planar panels of resin-impregnated fabric, whereby shrinkage thereof during manufacture is reduced, the steps comprising:
- (a) providing a substantially planar fabric having a warp;
- (b) coating said fabric with a curable resin;
- (c) partially curing said resin;
- (d) cutting said partially cured resin-impregnated fabric into panels having outer boundaries;
- (e) after said partial curing step, transversely cutting at least a plurality of said fabric warp within said outer boundaries of said panels at at least one location;
- and
- (f) after transversely cutting said fabric warp, fully curing said resin.
4 more elements
Dependencies are inferred from the claim text.