Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1977-02-15
1979-02-13
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264 36, 264328, B29D 302, B29H 308
Patent
active
041395921
ABSTRACT:
A process is provided for molding a tread on a vehicle tire body in which a tire body requiring a tread is supported in a mold which combines with the surface of the tire body to form a cavity conforming to the configuration and dimensions of the tread. The cavity is filled with a flowable vulcanizable elastomeric composition by injection at equally spaced points around the equatorial axis of the mold of measured volumes of material which will combine to fill the cavity and develop a low pressure in the mold cavity to insure flow of material until the cavity is completely filled. The invention also provides an injection molding apparatus having a mold which combines with a tire body supported therein to form a cavity corresponding to the configuration and dimensions of a tire tread. A series of equally spaced openings are provided around the equatorial axis of the mold for injection of molding composition and openings are provided around the sides of the mold cavity for the escape of air from the cavity as it is filled with composition.
REFERENCES:
patent: 2476884 (1949-07-01), Maynard
patent: 2569935 (1951-10-01), Leguillon
patent: 2744290 (1956-05-01), Corson
patent: 2873790 (1959-02-01), Cadwell
Industrie Pirelli S.p.A.
Silbaugh Jan H.
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