Method for extruding ethylene polymers

Details Method for extruding ethylene polymers Method for extruding ethylene polymers

1991-07-25

1992-10-20

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421121, 264349, 366 81, 366 88, 425208, 4253761, B29C 4760

Patent

active

051567903

ABSTRACT:
An improvement in the method for extruding ethylene polymers which are extruded through an extruder apparatus including an extruder screw having a screw root and a series of flights having a leading edge and a trailing edge. The extruder apparatus also has an inlet end and a discharge end and wherein the pitch ratio divided by the depth ratio is greater than 2/3. The improvement provides a metallic coating selected from the group such as nickel coating or a matte chrome finish on the screw root and the leading and trailing edges of the flights, the coating being present in an amount sufficient to increase the output of the extruder screw.

REFERENCES:
patent: 3998318 (1976-12-01), McAlarney
patent: 4310484 (1982-01-01), Blakeslee
patent: 4329313 (1982-05-01), Miller
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patent: 4522776 (1985-06-01), Ramamurthy
patent: 4642041 (1987-02-01), Murphy
patent: 4746220 (1988-05-01), Sukai et al.
patent: 4863661 (1989-09-01), Maddy
patent: 4948543 (1990-08-01), Pawlowski et al.
patent: 4996919 (1991-03-01), Mansfield

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