Apparatus for injection molding of multi-layer bodies of thermop

Details Apparatus for injection molding of multi-layer bodies of thermop Apparatus for injection molding of multi-layer bodies of thermop

1974-09-06

1976-03-30

Annear, R. Spencer

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

425244, 425245R, 425817R, 425DIG224, B29F 112

Patent

active

039471772

ABSTRACT:
Method and apparatus for the intermittent manufacture of multi-layer molded bodies of thermoplastic material with a foamed core and an unfoamed shell, wherein a strand of a nonfoaming plastic of ring-shaped cross-section enclosing a strand of plastic containing a foaming agent is injected into a mold.

REFERENCES:
patent: 1859901 (1932-05-01), Trebes
patent: 3070126 (1962-12-01), Schneider
patent: 3222722 (1965-12-01), Reifenhauser
patent: 3241503 (1966-03-01), Schafer
patent: 3479422 (1969-11-01), Zavasnik
patent: 3778209 (1973-12-01), Wallace et al.
patent: 3894823 (1975-07-01), Hanning

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