Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1991-11-04
1993-07-20
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 467, 264265, 2642711, B29C 6722
Patent
active
052290476
ABSTRACT:
A method and apparatus for producing foam elastomer tires for various uses including bicycle and wheel chair tires with a minimum amount of wasted material. The method involves spin casting the tires wherein a mold with suitably designed tapers on the exterior surface is placed between press plates with corresponding annular tapers which cause the mold to be accurately centered within the press plates when the press is closed. The preblended liquid foamable materials are either poured directly into the mold or onto a surface immediately adjacent to the mold gate. One or more tension members are located within the mold such that either the incoming stream of preblended liquid foamable materials wet the tension member(s), or the tension member(s) lie more or less in the path of the expanding foamable material as it fills and forces its way out of the mold, or (preferably) both. This ensures that the foaming material completely covers the tension member(s) so that the tension members are fully embedded and form an integral part of the resulting tire. This novel arrangement provides a method of producing consistent, high quality tires.
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