Method of extruding linear low-density polyethylene without surface melt fracture
AssigneeDow Global Technologies LLC
InventorsDaudi A. Abe, Bo Liu
Life of this patent
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Abstract
A method of extruding a melt of a linear low-density polyethylene (LLDPE) without surface melt fracture, the method comprises heating a melt of the LLDPE to a temperature from 190.0 to 260.0 degrees Celsius; and extruding through a die the heated melt at a shear rate of from 1,100 to 7,000 per second and at a shear stress of greater than 0.40 megapascal, thereby forming a polyethylene extrudate without surface melt fracture.
Claims8
A method of extruding a melt of a linear low-density polyethylene (LLDPE) so as to form an LLDPE extrudate without surface melt fracture, the method comprising heating a melt of the polyethylene to a temperature from 200.0 to 260.0 degrees Celsius (° C.);
- and extruding through a die the heated melt at a shear rate of from 1,101 to 7,000 per second (s−1) and at a shear stress of greater than 0.41 megapascal (MPa), thereby forming a linear low-density polyethylene extrudate without surface melt fracture;
- and cutting the LLDPE extrudate into pellets having surfaces without surface melt fracture.
Dependencies are inferred from the claim text.