Process for reclaiming thermally strained polyester scrap materi

Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment

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264 37, 264 85, 264169, 264140, 26421124, 264DIG69, 425185, B29B 1700, B29C 4776

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active

052251306

ABSTRACT:
Reclaiming of polyester waste material for re-use in the production of high-quality PET plastic material comprises shredding, cleaning, sorting and postcondensing said waste materials. The shredded scrap material comprises polyester waste materials of various molecular weights and degrees of purifying. The shredded material is molten and filtered The filtered melt is either post-condensed in the molten state and then granulated or is first granulated and then subjected to a solid phase post-condensation. The granules obtained in each case are preferably fed into an extruder and extruded together with virgin raw material so as to produce a useful film or article.

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patent: 4756858 (1988-07-01), Reifenhauser et al.
patent: 4958006 (1990-09-01), Bernier et al.
patent: 5102594 (1992-04-01), Burlet et al.

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