Method and apparatus for removing plastic residue

Details Method and apparatus for removing plastic residue Method and apparatus for removing plastic residue

1998-10-28

2000-11-21

Carrillo, Sharidan

Cleaning and liquid contact with solids

Processes

Using solid work treating agents

134 7, 134 8, 134 16, 134 17, 134 19, 134 221, 134 2211, 134 2219, 134 38, 432 75, B08B 702

Patent

active

061497320

ABSTRACT:
Equipment used in the processing of plastic, such as molds and extrusion screws, is cleaned of plastic residue by a combination of thermal cycling and agitation without impact cleaning. A chamber can be heated by an electric radiant heater and cooled by the introduction of liquid nitrogen. A fixture in the chamber receives the equipment to be cleaned and is agitated by a drive motor. The chamber is heated and cooled in the following cycle in which the drive motor agitates the fixture: first to 250-300.degree. F., then to -315.degree. F., then cycled between -50.degree. F. and -10.degree. F., then to 150.degree. F., then to -200.degree. F., then to 100.degree. F., then to ambient temperature. The chamber is controlled by a computer that prompts the operator for the kind of plastic to be cleaned off of the equipment and then controls the heating and cooling automatically.

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