Powder slush process and apparatus for making plastic articles

Details Powder slush process and apparatus for making plastic articles Powder slush process and apparatus for making plastic articles

B - Operations, Transporting

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B29C 39/38 (2006.01) B29C 33/36 (2006.01) B29C 35/04 (2006.01) B29C 41/18 (2006.01) B29C 41/46 (2006.01) B29C 35/16 (2006.01)

Patent

CA 1291617

ABSTRACT OF THE DISCLOSURE The plastic molded article is produced by heating a mold by contact with a preheated salt bath. The salt bath is readily maintained at a uniform temperature and is self-insulating for energy efficiency. A noncontact infrared sensor monitors the mold cavity temperature while in the salt bath, and the mold is removed from the bath when the proper mold temperature is reached. A charge of plastic powder is introduced into the mold by clamping the mold to a powder slush box with the mold cavity confronting the opening of the box. The mold and box are then simultaneously rotated to pour the plastic charge into the mold. The plastic charge forms a skin on the cavity surface and additional plastic material may be built up to provide additional thickness. The mold and box are then separated; the mold is then postcured and cooled, whereupon the finished article may be removed from the mold.

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