Process for extrusion

Details Process for extrusion Process for extrusion

1996-06-26

1998-03-17

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264564, 264 85, 264141, 26421124, 425205, B29B 906

Patent

active

057283354

ABSTRACT:
A process for the extrusion of polyethylene having a broad molecular weight distribution wherein the polyethylene is prepared in pellet form, said extrusion taking place in a pelletizing extruder having one or more zones essentially filled with polyethylene and two or more zones partially filled with polyethylene including
(i) introducing the polyethylene into the extruder at a temperature sufficient to melt the polyethylene; (ii) introducing a mixture of an inert gas and oxygen into each partially filled zone wherein the mixture contains about 1 to about 21 percent by volume oxygen based on the volume of the gaseous mixture; (iii) passing the molten polyethylene through each zone at melt temperature; and (iv) extruding the polyethylene into pellets and cooling same.

REFERENCES:
patent: 4302565 (1981-11-01), Goeke et al.
patent: 4528151 (1985-07-01), Matsuo et al.
patent: 4814135 (1989-03-01), Heitz
patent: 4890996 (1990-01-01), Shimizu
patent: 5284613 (1994-02-01), Ali et al.
patent: 5458474 (1995-10-01), Neubauer et al.
patent: 5539076 (1996-07-01), Nowlin et al.

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