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. 06, 2005
Filed:
Sep. 29, 2000
Ralf-uwe Bauer, Rudolstadt, DE;
Uwe Kind, Rudolstadt, DE;
Ralf-Uwe Bauer, Rudolstadt, DE;
Uwe Kind, Rudolstadt, DE;
Zimmer AG, Frankfurt, DE;
Abstract
The invention relates to a method for continually producing an extrusion solution for producing cellulosed shaped bodies, such as fibres and films, according to the lyocell method. According to the inventive method, (a) a cellulose suspension is produced from cellulose and an aqueous phase in a mass ratio ranging from 1:3 to 1:40, whereby shearing is maintained for between 5 to 200 minutes. (b) The cellulose suspension is dewatered to form a material having a cellulose content ranging from 20 to 80 mass % and the aqueous phase produced thereby is at least partially returned to step (a). (c) The humid cellulose material being homogenised is transported through a first shearing zone in the absence of N-methylmorpholine-N-oxide. (d) The cellulose material is transported through a second shearing zone after sufficient aqueous N-Methyl-morpholine-N-oxide has been added to the homogenised cellulose material so that, after mixing, a suspension having a N-Methylmorpholine-N-oxide content ranging from 70 to 80 mass % in the liquid phase is obtained. The cellulose material or the suspension completely fills in the available cross-section of transport in the shearing zones and (e) the produced cellulose suspension being sheared is converted into the extrusion solution in aqueous N-Methylmorpholine-N-oxide, whereby water evaporates.