B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/151
B29C 45/00 (2006.01)
Patent
CA 1317717
ABSTRACT OF THE DISCLOSURE SYSTEM FOR INJECTION MOLDING ELONGATED BODIES 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 sec- tion (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 posi- tion 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.
600735
Majerus Norbert
Mills Harold Elbert
Rambacher John Sylvester
Sim & Mcburney
The Goodyear Tire & Rubber Company
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