Method and device for controlling the composition of the cellulose containing extrusion solution in the lyocell process
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United States of America Patent
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Feb 5, 2008
Grant Date -
N/A
app pub date -
Sep 29, 2000
filing date -
Oct 6, 1999
priority date (Note) -
Expired
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Abstract
A method of regulating the composition of the cellulose-containing extrusion solution in the production of cellulosic molded articles, whereby (a) cellulose is mixed with an aqueous amine oxide solution; (b) the mixture is converted to the extrusion solution by evaporation of water in vacuo at an elevated temperature and by input of shearing energy; (c) the extrusion solution is extruded, forming the cellulosic molded article, and is coagulated in a coagulation bath, and (d) the resulting molded article is washed to remove the residual amine oxide, characterized in that in step (a) the cellulose/amine oxide ratio is kept at a predetermined level by preregulation, and the water content of the extrusion solution is kept at a predetermined level by a main regulation after leaving step (b). This method allows accurate regulation of the composition of the solution.
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