Extrusion die assembly

Details Extrusion die assembly Extrusion die assembly

1989-10-02

1991-02-26

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

4251331, 425466, B29C 4706

Patent

active

049958003

ABSTRACT:
The invention concerns an extrusion die assembly, especially for use where accurate centering of a mandrel is important. The assembly includes the first member having a mandrel projecting therefrom and an extrusion passage generally in line with the mandrel, which extrusion passsage is, at one end, of cross-section to conform with a passage carrying extrudate for the extrusion head and which merges, over its length, into an extrusion passage at the other end, at least partially surrounding the root of the mandrel. This member is adjustably located in an outer member, which together with the mandrel defines an extrusion nozzle. Since the extrusion passage passes through the first member, it is possible to provide positioning means for the first member and the mandrel without interfering with extrudate's flow.

REFERENCES:
patent: 2859476 (1958-11-01), Lainson
patent: 3899276 (1975-08-01), Sokolow
patent: 4061461 (1977-12-01), Hessenthaler
patent: 4185954 (1980-01-01), Murakami et al.
patent: 4268239 (1981-05-01), Herrington, Jr.
patent: 4305703 (1981-12-01), Lupke et al.
patent: 4500284 (1985-02-01), Lupke
patent: 4712993 (1987-12-01), Lupke
patent: 4808098 (1989-02-01), Chan et al.

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