Method for making a lap seam extruded tendon

Details Method for making a lap seam extruded tendon Method for making a lap seam extruded tendon

1984-04-25

1985-08-06

Woo, Jay H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624423, 15624424, 264174, B29C 1900

Patent

active

045334218

ABSTRACT:
A method and die arrangement are disclosed for making a seamed plastic jacket for a tendon suitable for various applications, such as post tensioning concrete. In the method, a heated, curled, discontinuous strip of plastic material is extruded around a moving strand which has been previously coated with a corrosion inhibitor. The discontinuous strip, which includes ends that overlap, is then pulled down around the moving strand and pressure is applied to the overlapping sections to form a seal.

REFERENCES:
patent: 3646748 (1972-03-01), Lang
patent: 3654027 (1972-04-01), Middleton
patent: 4331499 (1982-05-01), Madsen et al.
patent: 4478670 (1984-10-01), Heyse et al.
The Journal of Concrete Society, vol. 2, No. 2, Feb. 1968.
Illustration of Tendon made by the Process of U.S. Pat. No. 3,654,027.
Depiction of the Prior Art Paper-wrapped Tendon.

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