Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With coupling between charger and mold
Patent
1978-06-30
1980-04-22
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With coupling between charger and mold
249107, 249110, 425573, B29F 104, B29H 308
Patent
active
041993152
ABSTRACT:
An apparatus is provided for injection molding a pneumatic tire having corresponding symmetrical parts such as the sidewalls of the tire which are geometrically symmetrical and have substantially the same physical characteristics. The apparatus involves means for 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.
REFERENCES:
patent: 2191703 (1940-02-01), Anderson
patent: 2476884 (1949-07-01), Maynard
patent: 2569935 (1951-10-01), Leguillon et al.
patent: 3389749 (1968-06-01), Towns et al.
patent: 3891740 (1975-06-01), Vannan
patent: 3968307 (1976-07-01), Matsui et al.
patent: 4088523 (1978-05-01), Gallizia et al.
Bandel Paolo
Gallizia Achille
Industrie Pirelli S.p.A.
Silbaugh Jan H.
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