Crosshead with longitudinal and transverse shear mixers

Details Crosshead with longitudinal and transverse shear mixers Crosshead with longitudinal and transverse shear mixers

1985-03-01

1986-04-22

Flint, Jr., J. Howard

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

425206, 425207, 425381, 425224, 425466, B29D 2304, B29F 304, B01F 710

Patent

active

045841543

ABSTRACT:
A crosshead (10b) and a method are provided for extruding a tubular layer of a thermoplastic material, or for coextruding tubular layers of various thermoplastic materials, without incurring a weld line. The crosshead (10b) includes a supply passage (46) which provides an annular flow of thermoplastic material around a mandrel (18b) by providing separate flows that merge distal from a supply passage (52), a first compressive forging passage (72) that provides static mixing by transverse viscous shear, a longitudinal shear mixer (44a) that provides static mixing by longitudinal viscous shear, and a second compressive forging passage (94) that provides static mixing by longitudinal shear, and an extrusion opening (110).

REFERENCES:
patent: 2607077 (1952-08-01), Dulmoge
patent: 2669750 (1954-02-01), Keeney
patent: 3153686 (1964-10-01), Adams
patent: 3355769 (1967-12-01), Fogelberg
patent: 3694123 (1972-09-01), Cook et al.
patent: 4173446 (1979-11-01), Larsen
patent: 4280801 (1981-07-01), Wheeler et al.
patent: 4389119 (1983-06-01), Valsamis et al.
patent: 4411532 (1983-10-01), Valsamis et al.
patent: 4486099 (1984-12-01), Tadmor
patent: 4541793 (1985-09-01), Lindqvist

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