Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1977-02-07
1978-10-31
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264326, B29F 104, B29H 308
Patent
active
041234960
ABSTRACT:
A process and apparatus are provided for injection molding a pneumatic tire having corresponding symmetrical parts such as the sidewalls of the tire which are geometrical symmetrical and have substantially the same physical characteristics. The process involves providing a feed stream of suitable plastic or elastomeric compound such as rubber, separating the feed stream into intermediate streams and remixing the intermediate stream before injection into the mold. The compound is injected into the mold cavities at uniformly spaced points along at least one of the annular zones of the cavity. The feed stream is preferably separated into two streams, one of which comes primarily from the outer portion of the stream and the other predominantly from near the center of the stream and then these streams are intermixed to provide a stream which is substantially uniform in composition throughout. Similarly prepared streams are injected into the two parts of the mold cavity which form a pair of symmetrical parts of the tire such as the two sidewalls.
An apparatus for dividing a feed stream into the intermediate streams and mixing them to form a stream for injection into the mold cavities is also provided.
REFERENCES:
patent: 2191703 (1940-02-01), Anderson
patent: 2476884 (1949-07-01), Maynard
patent: 2569935 (1951-10-01), Leguillon
patent: 3389749 (1968-06-01), Towns
patent: 3891740 (1975-06-01), Vannan
patent: 3968307 (1976-07-01), Matsui
Bandel Paolo
Gallizia Achille
Industrie Pirelli S.p.A.
Silbaugh Jan H.
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