초록 ▼

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°and 600°Fahrenheit; and fo

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°and 600°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.

대표청구항 ▼

A method for molding plastic objects comprising: taking a combination of waste plastic materials which have been ground into a comminuted mixture, said combination of plastic materials comprising at least two materials selected from a group of materials consisting essentially of polyester, polyethyl

A method for molding plastic objects comprising: taking a combination of waste plastic materials which have been ground into a comminuted mixture, said combination of plastic materials comprising at least two materials selected from a group of materials consisting essentially of polyester, polyethylene, polypropylene, and metal; feeding said mixture into a hopper of a screw extruder capable of applying heat and pressure to said mixture; using said screw extruder to heat said mixture to a temperature of approximately 350 degrees-600 degrees Fahrenheit whereby said mixture will melt and to force said molten mixture outwardly through a die opening under a pressure of from approximately 100 lbs. per sq. inch to 600 lbs. per sq. inch; holding the inlet opening of a mold in tightly sealed relationship over said die opening so as to receive said molten mixture issuing from said die opening, said mold having an enclosed cavity in communication with said inlet opening for receiving said molten mixture; continuing to use said screw extruder to force said molten mixture through said die opening and said inlet opening into said enclosed cavity of said mold until said mold is completely filled with said molten mixture at a pressure of from 100 to 600 p.s.i.; removing said mold from said screw extruder after said cavity is filled; permitting said mixture within said mold to cool and harden; removing said hardened mixture from said mold.