Method of forming a molded plastic part

Details Method of forming a molded plastic part Method of forming a molded plastic part

1991-11-19

1993-11-30

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264108, 2641771, 2642102, 264247, 264275, 264294, 264323, 264325, 2643288, 26432811, 26432812, 26432816, 26432817, 26432818, 425144, 425145, 425149, B29B 700, B29C 4300, B29C 4500, B29C 4700

Patent

active

052662462

ABSTRACT:
A method and apparatus for forming a molded plastic part such as a body side molding for a motor vehicle in which a ribbon of plastic material is extruded through a shaping die of an extruder and is thereafter moved through a runner and into an elongated closed end mold cavity having a size and shape conforming to the body side molding. The cross-sectional area of the extruded ribbon, the runner and the mold cavity are substantially equal and the entire path of the plastic material moving through the extruder, runner and mold cavity is maintained at a temperature above the melting point of the plastic material so that the plastic material moves smoothly and quiescently along the path under relatively low pressure and with minimal disturbance. The invention process substantially eliminates swirling and streaking of metal particles which are commonly dispersed in the plastic material to give the body side molding a metallicized, glossy appearance.

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