Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1988-04-12
1989-04-25
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
249 86, 249 91, 249165, 264275, 264279, 2642791, 2642973, 264323, 26432814, 264DIG69, 425113, 425116, 425576, B29C 3334, B29C 4514, B29C 4702, B29C 4760
Patent
active
048246271
ABSTRACT:
The method of the present invention involves taking a comminuted mixture of waste plastic materials, feeding the mixture into a screw extruder capable of applying heat and pressure to the mixture; using the screw extruder to heat the mixture to a temperature of between 350.degree. and 600.degree. Fahrenheit; and forcing the molten mixture outwardly through a die opening under a pressure of from 100 lbs. per sq. inch to 600 lbs. per sq. inch into a mold in tightly sealed relationship over the die opening. The mold, after being filled, is removed from the screw extruder, and the mixture is permitted to cool and harden in the mold. The hardened mixture is then removed from the mold.
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Hammer Floyd V.
Harper Brian
Floyd V. Hammer
Tentoni Leo B.
Thurlow Jeffery
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