Multi-layer molding nozzle

Details Multi-layer molding nozzle Multi-layer molding nozzle

1991-01-18

1992-07-21

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

B29C 4522

Patent

active

051318300

ABSTRACT:
A multi-layer forming nozzle includes a valve member which can open and close a flow passage for molten resin which forms an intermediate layer of a multi-layer molded product by injection molding. The valve member is operated in response to resin pressure differentials at the front and back of the valve member to accurately switch from a multi-layer operation to a single layer operation and vice versa. A three-layer nozzle in accordance with the invention has a nozzle body provided interiorly with a first resin path, a second resin path and a third resin path in the form of a concentric circle bending to the same injection opening. The valve member is located either in a mouth portion of the third resin path in the central portion positioned internally of a mouth portion of the second resin path or a mouth portion of the second resin path in the intermediate portion positioned internally of the first resin path. The valve member is moved forward and backward in response to resin pressure differentials to open and close the valve member.

REFERENCES:
patent: 3976226 (1976-08-01), Monnet
patent: 4659531 (1987-04-01), Ezaki
patent: 4808101 (1989-02-01), Schad et al.
patent: 5030077 (1991-07-01), Orimoto et al.

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