Injection-molding apparatus for making objects of two different

Details Injection-molding apparatus for making objects of two different Injection-molding apparatus for making objects of two different

1981-06-29

1983-03-15

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

425132, B29F 103

Patent

active

043766250

ABSTRACT:
An injection-molding apparatus has a nozzle extending along an axis and formed with an axially forwardly opening outlet, an annular port fixed immediately axially behind or upstream of the outlet, and a central axially forwardly opening port axially fixed behind the annular outlet. Respective plastifiers for feeding respective plastified synthetic resins, normally thermoplastics, are connected to the respective ports. An axially displaceable valve body in the nozzle is displaceable from a fully forward position blocking both of the ports, through a partially back position blocking only the central port, to a fully back position clear of both of the ports. Thus in the fully forward position no resin can enter the nozzle, in the partially back position resin can enter the nozzle only from the annular port, and in the fully back position resins can enter the nozzle through both of the ports.

REFERENCES:
patent: 3921856 (1975-11-01), Langecker
patent: 4078875 (1978-03-01), Eckardt
patent: 4117955 (1978-10-01), Sokolow

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