Method of molding tubular parts and apparatus for practicing the

Details Method of molding tubular parts and apparatus for practicing the Method of molding tubular parts and apparatus for practicing the

1991-08-28

1992-11-10

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Of varying cross-sectional area or with intermittent...

26417716, 2642092, 425381, 425465, 425467, B29C 4722

Patent

active

051620901

ABSTRACT:
A method of and apparatus for molding a tubular part consisting of two lengthwise continuous portions of different cross-sectional shapes. The method involves extending or retracting a movable die of the apparatus with respect to an extrusion molding port thereof, which is formed by inserting a core in a non-projecting state in an extrusion opening in a die body, so as to regulate an extrusion rate by discharging a part of a raw molding material, and extruding the molding material while controlling the cross-sectional shape of the outer circumferential surface of the material being extruded, by a molding surface at the front end of the movable die, whereby the crosssectional shapes of the inner and outer circumferential surfaces of the material being extruded are varied.

REFERENCES:
patent: 3346918 (1967-10-01), Deleuze et al.
patent: 4531326 (1985-07-01), Ballocca et al.
patent: 4576773 (1986-03-01), Azzola et al.
patent: 4619077 (1986-10-01), Azolla et al.
patent: 4765936 (1988-08-01), Ballocca
patent: 4960375 (1990-10-01), Saito et al.

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