Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...
Patent
1996-12-27
1999-05-04
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With step of cleaning, polishing, or preconditioning...
264313, 264257, 264334, B27N 502
Patent
active
059001941
ABSTRACT:
A method for facilitating removal of a mandrel in the manufacture of hollow composite structures. A mandrel of substantially constant diameter is selected having a composition and coefficient of thermal expansion sufficient to enable it to expand when subjected to an elevated temperature. The mandrel is preheated to at least a predetermined minimum elevated temperature to thereby expand the mandrel radially outwardly. Composite material is wound around the mandrel while the mandrel has a temperature of at least the predetermined minimum elevated temperature. The composite material is then cured using any suitable curing technique. When the composite material has been cured, the mandrel is cooled to contract the mandrel radially inwardly, and the mandrel is removed from the composite material. This method of manufacture and removal is so effective that mandrels of constant diameter have been removed by hand from composite tubes of thirty feet in length.
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Heitbrink Jill L.
Wasatch Technologies Corporation
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