Method and apparatus for coinjecting two thermoplastic materials

Details Method and apparatus for coinjecting two thermoplastic materials Method and apparatus for coinjecting two thermoplastic materials

1982-09-29

1984-09-11

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

264 451, 264 464, 264 469, 264250, 264255, 2643288, 264DIG83, 425548, 425563, 425573, 425DIG229, B29D 2700, B29F 103, B29F 108

Patent

active

044709366

ABSTRACT:
Hot runner injection molding apparatus for coinjecting two thermoplastic materials sequentially through separate channels to form at least a two-layer sandwich material is provided. There is a valve means for instantaneously switching the flow of thermoplastic material from one channel to the other channel, the valve means preferably comprising a shuttle ball member.

REFERENCES:
patent: 3599290 (1971-08-01), Garner
patent: 3793410 (1974-02-01), Garner
patent: 3809733 (1974-05-01), Sandiford et al.
patent: 3873656 (1975-03-01), Garner
patent: 3966372 (1976-06-01), Yasuike et al.
patent: 4014966 (1977-03-01), Hanning
patent: 4104353 (1978-08-01), Monnet
patent: 4124308 (1978-11-01), Sokolow

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