Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1987-03-17
1988-03-29
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 469, 425812, 425817R, B29C 6722
Patent
active
047342323
ABSTRACT:
A solid tire having a polyurethane foam core is fabricated by first mounting the tire on a two piece jig which simulates the wheel hub on which the tire is to be mounted. This jig is centered on the tire and tightened so that the inside surfaces of the two halves of the jig abut tightly against the tire body. A fill hole for filling the tire with foam is provided on one of the jig halves. A plurality of small holes are formed in the tire in a circle which runs along the high point of the outer surface of the tire, these vent holes being formed on the same side of the tire as the fill hole. The tire is then filled with a mixture of polyol and isocyanate through the fill hole to form a microcellular flexible polyurethane core within the tire. The core material is fed into the tire until the tire is filled a predetermined amount which with the expansion resulting from the chemical reaction, completely fills the tire as evidenced by material existing from the fill hole, at which time the fill hole is plugged. The jig is removed from the tire while the core material is still expanding to assure that such material is permitted to expand outwardly against the inner wall of the tire in tight abutment thereagainst and towards the center to assure a tight fit with the wheel hub on which it is subsequently installed.
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Kuhns Allan R.
Silbaugh Jan H.
Sokolski Edward A.
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