Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Endless surface means to shape fluent material
Patent
1988-06-02
1989-04-04
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Endless surface means to shape fluent material
156125, 264167, 264308, 2643282, 2643288, 425543, 425547, 425572, 425574, 425581, B29C 4514
Patent
active
048182036
ABSTRACT:
A tire tread (74,76,194) is injection molded by increments in a mold cavity (56,58,119,224,262) having an open end (110,272) closed by a trailing end (116) of a cured section (114,228). A temperature moderating closed end (109,207,268) prevents complete curing of a trailing portion (116) of the cured section (114,228) while the rest of the section is cured. The mold (14,16,90,188,236) is opened so that the cured section (114,228) may be shifted to a position where the trailing portion (116) is clamped in the open end (110,272) of the mold cavity (56,58,119,224,262). A second section (118,228,264) is injection molded in the cavity (56,58,119,224,262) and the partially cured trailing portion (126) of the cured section (114,228,264) is cured and adhered to the leading portion (130) of the second section (114,228,264) as the second section is cured. This process may then be repeated for later sections to provide a desired length of cured tire tread stock (74,194,264). The mold (14,16,90,118,188,236) may have substantially flat molding surfaces (108) or longitudinally and curved molding surfaces (192,210,244). Mold segments (204,206,208,256,258,260) for a circumferentially curved mold cavity (224,262) may also be provided.
REFERENCES:
patent: 2710425 (1951-05-01), Rhodes
patent: 2897540 (1959-08-01), Rhodes
patent: 3992503 (1976-11-01), Henfrey et al.
patent: 4185065 (1980-01-01), Knipp et al.
patent: 4230649 (1980-10-01), Bohm et al.
patent: 4588365 (1986-05-01), Holzschuh
Majerus Norbert
Mills Harold E.
Rambacher John S.
Heitbrink Timothy W.
Lacher Frederick K.
Lewandowski T. P.
The Goodyear Tire & Rubber Company
Woo Jay H.
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