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US 3,993,726 AGranted
Methods of making continuous length reinforced plastic articles
AssigneeHercules Incorporated
InventorRichard L. Moyer
Life of this patent
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Abstract
Methods of making continuous length articles of reinforced plastic material includes passing rovings of temperature resistant material through a crosshead extruder to impregnate the rovings with a thermoplastic polymer under high pressure. The impregnated rovings are pulled from the extruder through a die and are cooled and shaped into a void free article having a desired cross-sectional shape.
Claims7
A method of making reinforced plastic articles comprising:
- advancing one or more continuous length rovings of temperature resistant material into a crosshead extruder die;
- forcing molten polymer into said die under relatively high pressure to impregnate said rovings;
- cross-section;
- continuously extruding and pulling said impregnated rovings through one or more exit orifices of said die to consolidate and shape said impregnated rovings into an article having a substantially uniform cross-section:
- at least partially cooling said article to harden the outer surface thereof;
- and
- compressing said article during cooling to remove voids therein and provide a uniform cross-section wherein said rovings comprise between about 30% to 90% by weight of said article.
4 more elements
Dependencies are inferred from the claim text.