Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1993-08-09
1995-06-13
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 37, 264211, 26421123, 264102, 264349, 264DIG69, 425DIG46, B29B 748, B29B 766, B29B 772
Patent
active
054240131
ABSTRACT:
A closed loop thermoplastic recycling process includes the step of testing particulated processed plastic material to determine the properties thereof. The tested properties are compared with targeted near virgin properties of the processed plastic material to determine any difference(s) therebetween. Additives based on the property differences determined during testing are admixed with the particulates in a twin screw extruder. During extruding, volatile constituents are simultaneously withdrawn from the fused particulates. The twin screws of the extruder are provided with a number of screw sections, each having a thread with predetermined degrees of chamfer and pitch length. Kneading blocks are mounted on certain screw sections prior to a vacuum vent port disposed along the feed path of the melt stream in the extruder. The extruded material is tested to determine if any property differences exist. If no unacceptable tested differences are found, the extruded material is prepared for reuse in place of or in conjunction with virgin plastic material having the same properties and characteristics.
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High-performance twin-screw compounding system, Werner & Pfleiderer.
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