Powder preheating

Plastic article or earthenware shaping or treating: apparatus – Female mold and means to feed measured charge of fluent... – Plural separate and distinct feeders

Reexamination Certificate

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Details

C425S145000, C425S162000, C366S133000, C366S136000, C366S137000

Reexamination Certificate

active

10716307

ABSTRACT:
Powdered starting material utilized for molding (e.g., rotational molding, injection molding, blow molding), extrusion, and the like can be preheated to reduce the time required to complete the processing of the material. After being preheated to a temperature below a melting temperature of the powder, the powder is transferred to a processing station. For example, in a rotational molding system, the preheated powder is transferred to a mold, where the preheated powder is melted and the mold is rotated such that the molten material adheres to the walls of the mold. After obtaining a desired distribution of the material over the walls of the mold, the temperature of the mold is decreased as rotation of the mold continues. When the article is sufficiently cooled, the article is removed from the mold.

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