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:
Dec. 28, 2021
Filed:
May. 14, 2013
Applicant:
Upm-kymmene Corporation, Helsinki, FI;
Inventors:
Assignee:
UPM-KYMMENE CORPORATION, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C 35/02 (2006.01); B01D 71/10 (2006.01); B01D 67/00 (2006.01); B01D 39/18 (2006.01); F26B 7/00 (2006.01); F26B 13/28 (2006.01); B01D 39/16 (2006.01); B29K 1/00 (2006.01); B29L 9/00 (2006.01); D21F 9/00 (2006.01); D21F 11/14 (2006.01); F26B 5/14 (2006.01);
U.S. Cl.
CPC ...
B29C 35/0277 (2013.01); B01D 39/1692 (2013.01); B01D 39/18 (2013.01); B01D 67/0004 (2013.01); B01D 67/0095 (2013.01); B01D 71/10 (2013.01); D21F 9/00 (2013.01); D21F 9/003 (2013.01); D21F 11/14 (2013.01); F26B 5/14 (2013.01); F26B 7/00 (2013.01); F26B 13/28 (2013.01); B01D 2239/0654 (2013.01); B01D 2323/42 (2013.01); B01D 2325/14 (2013.01); B29C 2035/0283 (2013.01); B29K 2001/00 (2013.01); B29L 2009/00 (2013.01);
Abstract
Method for preparing a membrane from fibril cellulose includes supplying fibril cellulose dispersion on a filter layer, draining liquid from a fibril cellulose dispersion by the effect of reduced pressure through the filter layer that is impermeable to fibrils of the fibril cellulose but permeable to the liquid to form a membrane sheet on the filter fabric, applying heat on the opposite side of the membrane sheet to the membrane sheet while continuing draining of the liquid through the filter layer by pressure difference over the filter layer, and removing the membrane sheet from the filter layer as a freestanding membrane.