Hinge for thermoplastic material

Details Hinge for thermoplastic material Hinge for thermoplastic material

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.

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