Title: Hinge for thermoplastic material

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.

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Inventors: Hulber, Loren J. (Naperville, IL)
Fluckiger, Raymond W. (Chicago, IL)

Application Number: 06/490383
Filing Date: 1983-05-02
Publication_date: 1984-03-06
Assignee: JOSTENS INC (US)

Primary Class(es): 428/167 428/130
Other Classes: B42C7/00; B42D3/06; B42F7/00; B42D3/00; B32B3/30
US Patent Ref:

3900550	August, 1975	Oliver et al.	428/167	Method of enhancing flexure of plastic hinges
4097628	June, 1978	Cheris et al.	428/167	Carpet runner

Other Refs:
Primary Examiner: Van, Balen William J.
Assistant Examiner:
Attorney: Laff, Whitesel, Conte & Saret

Parent Case Data:

This is a division of application Ser. No. 253,245 filed Apr. 13, 1981 now U.S. Pat. No. 4