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US 5,585,054 AGranted
Method of making a composite fiber reinforced polyethylene
OwnerDaniel W. Evansinventor
Life of this patent
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Abstract
A process for producing composite cellulose fiber reinforced polyolefin. The process includes preparing and mixing a blend of molten polyolefin, a coloring concentrate and a coupling agent in a kneading extruder, preheating cellulose fibers in an enclosed cram feed and mixing the blend of polyolefin, preheated cellulose fibers and ozone gas in a ozone chamber to form a polyolefin and fiber matrix. The polyolefin and fiber matrix is then fed to a twin screw extruder where it is further heated, mixed and then conveyed to a die to extrude in a desired shape.
Claims18
A method of producing a composite fiber reinforced polyethylene comprising:
- (a) blending a polyethylene resin in a mixer;
- (b) forming a molten, combined material from step (a);
- (c) feeding said molten, combined material to a low shear kneading extruder;
- (d) mixing said molten combined material in said extruder;
- (e) conveying said molten, combined material through an open port of said extruder;
- (f) conveying fibers through an enclosed screw cram feed;
- (g) pumping ozone into a ozone chamber through a first input of said ozone chamber;
- (h) conveying said molten, combined material into said ozone chamber through a second input of said ozone chamber;
- (i) conveying said fibers through a third input into said ozone chamber;
- (j) mixing said ozone, said molten, combined material, and said fibers and forming a polyethylene and fiber matrix in said ozone chamber;
- (k) conveying said polyethylene and fiber matrix from said ozone chamber to a feed throat of a twin screw extruder;
- (l) mixing said polyethylene and fiber matrix in said twin screw extruder;
- and,
- (m) extruding said polyethylene and fiber matrix through said twin screw extruder into a die having a desired shape.
11 more elements
Dependencies are inferred from the claim text.