Method and device for continually producing an extrusion...

Details Method and device for continually producing an extrusion... Method and device for continually producing an extrusion...

2005-12-06

2005-12-06

Purvis, Sue A. (Department: 1734)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

C264S207000, C264S191000, C264S200000, C106S217500, C366S091000

Reexamination Certificate

active

06972102

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.

REFERENCES:
patent: 6610134 (2003-08-01), Kind et al.
patent: 44 39 149 (1996-05-01), None
patent: 19837210 (1999-11-01), None
patent: WO 96/33302 (1996-10-01), None

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