Hinge for thermoplastic material

Details Hinge for thermoplastic material Hinge for thermoplastic material

1981-04-13

1983-08-09

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

150 52R, B32B 302

Patent

active

043979041

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 themoplastic 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: T535843 (1968-12-01), Pardue et al.
1975-1976 Modern Plastics Encyclopedia Article by Kenneth Arutt entitled "High-Frequency Head-Sealing/Embossing".

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