Flash-free vented tire mold

Details Flash-free vented tire mold Flash-free vented tire mold

1987-07-15

1988-04-26

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

Reshaping, resizing or vulcanizing means for tire, tire...

249141, 425812, B29C 3310, B29C 3502

Patent

active

047401451

ABSTRACT:
A tire mold having air and gas venting holes is provided with synthetic resin plugs mounted in enlarged bore portions of the vent holes adjacent the inner forming surface of the mold. The plugs are axially compressible and project a slight distance beyond the inner surface of the mold. The molding pressure of the material within the mold compresses the plug whereby an outer surface of the plug becomes generally flush with the inner surface of the mold cavity to substantially eliminate the formation of runners on the molded tire. The plugs preferably are formed of a PTFE (polytetrafluoroethylene) filter leaf membrane material.

REFERENCES:
patent: 3266099 (1966-08-01), Bucy
patent: 3377662 (1968-04-01), Fukushima
patent: 3804566 (1974-04-01), Kimura et al.
patent: 3822857 (1974-07-01), Tanie
patent: 3891363 (1975-06-01), Sievers et al.
patent: 4447197 (1984-05-01), Bartley et al.

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