Process for Preparing a Non-Woven Cellulosic Structure and the Non-Woven Cellulosic Structure Prepared Therefrom
a cellulosic structure and non-woven technology, applied in the direction of viscose artificial filaments, fibre chemical features, non-woven fabrics, etc., can solve the problems of increasing the cost of the process, prone to breakdown/maintenance of moving parts, and high cost of cupramonium rayon to produce absorbent cellulosic non-wovens
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example 1
[0049]12% cellulose Lyocell polymer solution was fed at the rate of 0.06 grams / hole / min through a rectangular spinneret having 20 rows of 80 micron diameter holes, giving an extrusion speed of 10 m / min. Below the spinneret the spinning box maintaining a regeneration liquid column of 510 mm was installed in such a way that the gap between top most water surface and spinneret bottom is between 15 to 25 mm. 5 mm gap was provided in the funnel bottom portion. Regeneration liquid flow rate of 10 to 15 m3 / hr was sufficient to maintain full level in spinning box. The velocity of the liquid is kept at 190 m / min. Although the water velocity at the outlet of the funnel is much higher, the drag imparted to the filaments made them to attenuate at 40 to 60 m / min speed, thus giving a draw ratio of 4 to 6. (Draw ratio is the ratio of filament speed to extrusion speed.) Collection belt operating at 10 m / min below the spinning box maintained a distance of 120 mm between the spinning box. Vacuum of 4...
example 2
[0050]11% cellulose Lyocell polymer solution was fed at the rate of 0.01 grams / hole / min through a rectangular spinneret having 20 rows of 80 micron diameter holes, giving an extrusion speed of 1.72 m / min. Spinning box was maintained at regeneration liquid column of 170 mm. 4 mm gap was provided in the funnel bottom portion. Regeneration liquid flow rate of 7 m3 / hr was sufficient to maintain full level in spinning box. The velocity of the liquid is kept at 109 m / min. Although the water velocity at the outlet of the funnel is much higher, the drag imparted to the filaments made them to attenuate at 8 m / min speed, thus giving a draw ratio of 4.6. Web laying speed was kept at 1 to 3 m / min to obtain a uniform non-woven. Vacuum of 255 mm of water column was provided below the laying portion. Web obtained on the belt was washed clear off the solvent and sent to multi layering device and then for bonding. Different samples were prepared by varying the number of layers to get non-woven sampl...
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