Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...
Patent
1987-09-10
1988-12-06
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
4251331, 425462, 425466, 425467, B29C 4706, B29C 4722
Patent
active
047893184
ABSTRACT:
A device for manufacturing molded articles of plastics material which have an outer skin of a plastics material free of expanding agents and a porous core of a plastics material containing an expanding agent includes an extruder head with a main duct in communication with a discharge opening. Two feed ducts for the two plastics materials lead angularly offset into the main duct at locations axially spaced from the discharge opening and from each other. A closing needle is axially movably placed in the main duct. The two feed ducts can be separated from the main duct by means of the closing needle. The closing needle defines a connecting duct extending essentially in axial direction. The connecting duct ends at the end face of the closing needle and at the circumference of the closing needle radially toward the more remote feed duct. In the closed axial position of the closing needle and in an at least partially open axial position of the closing needle, the radial circumferential opening of the connecting duct is located approximately on the same level as the inner radial outlet opening of the more remote feed duct. The closing needle is rotatable about the longitudinal axis of the extruder head relative to the outlet opening in any axial position of the closing needle.
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patent: 4117955 (1978-10-01), Sokolow
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patent: 4686075 (1987-08-01), Dziewanowski et al.
Battenfeld GmbH
Chiesa Richard L.
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