METHOD FOR PRODUCING CELLULOSIC FORMS

• Main Authors: RALF-UWE BAUER, FRANK-GUNTER NIEMZ
• Format: Patent
• Language: English
• Published: 31.10.2006
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS BASED THEREON; DERIVATIVES THEREOF; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; POLYSACCHARIDES; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROCESS FOR PRODUCING FORMED CELLULOSIC ARTICLES, PARTICULARLY FIBRES ANDFILAMENTS, COMPRISING A) DISSOLVING CELLULOSE IN AN AQUEOUS SOLUTION OF ATERTIARY AMINE OXIDE, ESPECIALLY N-METHYL-MORPHOLINE N-OXIDE, AND B) EXTRUDING THE CELLULOSE SOLUTION THROUGH AN EXTRUSION DIE VIA AN AIR GAPINTO A PRECIPITATION BATH WITH PRECIPITATION OF THE FORMED ARTICLES, SAID CELLULOSE SOLUTION AND/OR SAID PRECIPITATION BATH CONTAINING A TENSIDE, CHARACTERISED IN THAT IN THE STEP B) THE TENSIDE CONTENT C OF THE CELLULOSESOLUTION AND/OR OF THE PRECIPITATION BATH IS IN THE RANGE 100 PPM > C ? 5 PPM, AND THE WIDTH OF THE AIR GAP IS IN THE RANGE FROM 2 TO 20 MM. WITH THIS PROCESS THE AIR GAP WIDTH CAN BE CONSIDERABLY REDUCED WITHOUT DETERIORATION OF THE PROPERTIES OF THE FIBRES/FILAMENTS.