Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1983-05-02
1984-03-06
Van Balen, William J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
428130, B32B 330
Patent
active
044354649
ABSTRACT:
A hinge for thermoplastic material particularly suitable for loose-leaf binder covers is constructed by embedding an embossed welding die into the thermoplastic material to a depth less than the full height of the embossment so that no vertical lines are produced in the thermoplastic by the longitudinal edges of the die. The resulting surface of the thermoplastic is a hinge containing indentations corresponding to the pattern of the embossed die, which permit the thermoplastic to be folded at the hinge area.
REFERENCES:
patent: 3900550 (1975-08-01), Oliver et al.
patent: 4097628 (1978-06-01), Cheris et al.
Fluckiger Raymond W.
Hulber Loren J.
Josten's, Inc.
Van Balen William J.
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