Method for isolating cellulose and other adhesive materials during the recycling of waste plastics, in particular mixed plastics

US8162242B2 · kind B2 · utility

Assignee

• CVP Clean Value Plastics GmbH · DE

Inventors

• Michael Hofmann · Hamburg, DE
• Alexander Gercke · Bad Oldesloe, DE

Key dates

• Filing date: Nov 16, 2007
• Grant date: Apr 24, 2012
• Expiry date: Jun 10, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for the removal of wood pulp and other adhering substances from waste plastics in the recycling of all types of waste plastics, of mixed plastics (MKS) in particular, in which foils and pieces from thicker plastic parts of if necessary pre-sorted waste plastics are mechanically pre-shredded into flakes or particles up to a preset size, wherein oversizes are sorted out, the shredded product is charged into a disc refiner together with water, wherein the proportion of flakes and other particles is at least 10% of the total volume, substances adhering on the flakes are rubbed down by the co-operating discs of the refiner to a large extent, and are then present as separate substances, and the substances rubbed down are separated from the plastic particles by a suitable separation method.