The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2022
Filed:
Feb. 27, 2020
Polymetrix Ag, Oberbüren, CH;
Andreas Christel, Zuzwil, CH;
POLYMETRIX AG, Oberbüren, CH;
Abstract
A process for recycling polyolefins comprising the steps of extruding used polyolefin material, producing granules from the polyolefin material exiting from the extrusion into a liquid cooling medium, separating the cooling medium to obtain a dry polyolefin granulate, and treating the dry polyolefin granulate in a treatment space with a treatment gas, preferably by counter-current flow, immediately after separation of the cooling medium, the dry polyolefin granules still have a granule temperature (T) which is above a temperature (T) of the liquid cooling medium and in the range of 71° C.-200° C., preferably 80° C.-160° C., but below the melting point of the granules, and at least 75% of the dry polyolefin granules, in the treatment space, have a dry temperature (T) which is in the range of granule temperature (T)±20° C., but below the melting point of the granules.