Method for making prestressed tubular belt

Details Method for making prestressed tubular belt Method for making prestressed tubular belt

2007-05-07

2008-09-02

Hess, Douglas A (Department: 3651)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C264S229000

Reexamination Certificate

active

07419558

ABSTRACT:
A method for manufacturing a self-closing tubular belt with predetermined compression forces at a longitudinal joint comprises winding a plastic material onto a small mandrel such that the plastic material thickness is not more than the height of a mandrel spiral rib, curing the plastic material, and removing the plastic material from the small mandrel, resulting in the plastic material being in a form of a spiral rubber spring having gaps between its twists. The resultant rubber spring is then wound on a larger mandrel thereby forming winding gaps. These winding gaps are then filled with a raw filler material, and these are processed so that all turns of the rubber spring are joined together monolithically. This is removed from the mandrel by making a longitudinal split in the spring, producing the tubular belt having prestressed regions formed by the spring, and resisting portions formed by the filler material.

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