Extrusion die for a blow head for making blown plastic films

Details Extrusion die for a blow head for making blown plastic films Extrusion die for a blow head for making blown plastic films

1985-09-27

1987-10-20

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264 406, 264169, 2642097, 425461, 425467, B29C 4708, B29C 4712

Patent

active

047011165

ABSTRACT:
An extrusion die for a blow head for making blown plastic films comprises inner and outer rings, which are made of a ferrous material, particularly steel, and define between them an annular orifice. Those surfaces of the inner and outer rings which define the die orifice are covered by a layer consisting of a metallic material having a higher thermal conductivity than steel.

REFERENCES:
patent: 3920782 (1975-11-01), Cogswell
patent: 4248577 (1981-02-01), Bory et al.
patent: 4329314 (1982-05-01), Jackson et al.
patent: 4488861 (1984-12-01), Reifenhauser

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