Energy transfer screw and improved extrusion process
AssigneeDow Global Technologies LLC
InventorsQian Gou, Mark A. Spalding, Bharat I. Chaudhary, Karl Seven
Life of this patent
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Abstract
Lower discharge temperatures and improved flow rates are obtained for the processing of meltable, solid crosslinkable compositions comprising a polymer, e.g., polyethylene, and a peroxide, in a single barrel extruder by equipping the extruder with an energy transfer (ET) screw that comprises: (1) an ET section with a distance averaged ET section depth of 8.0% to 10% of the extruder barrel internal diameter, and (2) a metering section with a metering section depth of 6.0% to 8% of the extruder barrel internal diameter.
Claims8
An energy transfer (ET) screw for a single screw extruder, the extruder comprising an extruder barrel with an inside diameter, the screw comprising:
- (1) an ET section with a distance averaged ET section depth of 8.0% to 10% of the extruder barrel internal diameter, and
- (2) a metering section with a metering section depth of 6.0% to 8% of the extruder barrel internal diameter.
A process of melting and extruding a crosslinkable composition in a single screw extruder, the extruder comprising an energy transfer (ET) screw and a barrel with an inside diameter, the screw rotatably mounted within the barrel, the process comprising the steps of:
- (A) feeding a meltable, solid crosslinkable composition to the extruder;
- (B) rotating the screw within the extruder barrel;
- and
- (C) melting the solid crosslinkable composition within the extruder and moving the composition through the extruder by the rotation of the screw;
- the screw comprising:
- (1) an ET section with a distance averaged ET section depth of 8.0% to 10% of the extruder barrel internal diameter, and
- (2) a metering section with a metering section depth of 6.0% to 8% of the extruder barrel internal diameter.
Dependencies are inferred from the claim text.