Abstract: A process for removing deleterious surfaces from polymeric regrind particles in which the polymeric regrind particles such as TPO, PC/ABS, PC/PBT, PA/PP or PA/PPO having a surface material deleterious to post-treatment processes is contacted by an aqueous attritive environment for an interval sufficient to accomplish dissociation of the deleterious surface material from contact with the polymeric regrind particulate substrate and removal of less than 10% of the total mass of polymeric regrind particulate substrate. After sufficient contact between the attritive environment and the polymeric regrind particles, the polymeric regrind particulate substrate is separated from the attritive environment and the retained dissociated deleterious surface material.

Abstract: In a recycling process, granulated plastic material coated with a paint film is melted in an extruder. During extrusion, the paint film is volatilized and removed by vacuum from the melted granulate stream. Additives are admixed with the particulates and any remaining paint film in an extruder. Water is introduced into the melted plastic stream in the extruder to neutralize toxic material levels discharged from the extruder and from the extruded plastic material.

Abstract: A close 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 During extruding, volatile constituents are simultaneously withdrawn from the fused particulates.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.