Patents Assigned to Nordenia Verpackungswerke GmbH
  • Process for removing solvent and nitrocellulose residues from polyolefin shreds
    Patent number: 5714070
    Abstract: Processes are described for the removal of solvent and/or nitrocellulose residues from precleaned polyolefin, in particular from precleaned polyethylene recyclate shreds, whereby the polyolefin is either mixed with washing water, the solvent is expelled and the nitrocellulose is at the same time washed from the polyolefin, or the polyolefin is washed with cleaned solvent, the solvent is mechanically separated, and the solvent residues remaining on the polyolefin are expelled by a stream of nitrogen.
    Type: Grant
    Filed: August 9, 1994
    Date of Patent: February 3, 1998
    Assignee: Nordenia Verpackungswerke GmbH
    Inventor: Arnulf Lorenz
  • Process and apparatus for regenerating used articles of polyolefin to reusable raw material
    Patent number: 5368796
    Abstract: Used foils made of polyethylene are shredded and, in a solvent bath containing an organic solvent, subjected under intensive motion, for example through mechanical stirring, to a frictional surface cleaning, and simultaneously to an extraction without dissolving the plastic material. By the extraction, ingredients added to the foils and PE waxes are separated from the shreds, and the printing inks are removed especially through the frictional surface cleaning.
    Type: Grant
    Filed: March 4, 1993
    Date of Patent: November 29, 1994
    Assignee: Nordenia Verpackungswerke GmbH
    Inventors: Arnulf Lorenz, Hans P. Walser