Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Patent
1986-05-28
1987-03-31
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
425185, 425188, 425190, 425462, 425466, B29C 4730
Patent
active
046539948
ABSTRACT:
An extrusion head is provided for extruding flat profiles for producing tread strip portions of vehicle tires from mixtures of rubber or plastics materials, which permits one of the constituents such as the tread strip mixture to be changed without adversely affecting the other constituent parts of the mixture, such as the lateral rubber strip mixtures and the base rubber layer. This is achieved by suitably deflecting the flow channels for the lateral rubber layers in a front template. The flow channel for the lateral strips enters the template below the flow channel for the tread strip but discharges alongside the lateral edges of the tread strip. The head comprises a fixed central portion and pivotable upper and lower portions, the flow channels for the constituents of the mixture being defined by channels formed in insert members located between the head portions. By so doing, the flow channels for the base layer and for the lateral strips can be formed in one of the insert members leaving only the flow channel for the tread strip to be formed in the other insert member. Since it is the tread strip mixture which is most frequently changed, this can now be effected without adversely affecting the other two mixtures.
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patent: 4526528 (1985-07-01), Kline et al.
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Chiesa Richard L.
Hermann Berstorff Maschinenbau GmbH
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