Patent ID: 9745673
Date: 2017-08-29
CPC Classifications: D01D,D01F,D01G,D04H,D10B

Claim:
1. A spunbond method for producing nonwoven fabrics with hygroscopic metastatic feature comprises following steps: a. Prepare macromolecule polymer of bio-polyamide 6,10 as raw material; b. Fuse the bio-polyamide 6,10 into a melt of molten substance under high temperature in range of 250-280 degree centigrade (250-280° C.); c. Via spunbond method, the melt is forcedly spun out of spin nozzles for converting it into natural bio-polyamide 6,10 filaments; d. Draw the natural bio-polyamide 6,10 filaments by an airflow draw jet device to become uniform fine natural bio-polyamide 6,10 filaments, then bond and lay these natural bio-polyamide 6,10 filaments on a conveyer to form a substrate fibrous web with thickness in range of 0.3-2.5 mm; e. Prepare pulp as raw material with content cellulose over 65% and degree of polymerization (DP) in range of 500-1500; f. By putting N-methylmorpholine N-oxide (NMMO) as dissolving solvent into prepared pulp for high speed blending and dissolving under low temperature in range from 60-90 degrees centigrade (60-90° C.), then dehydrate it via heating up to temperature in range from 80-120 degrees centigrade (80-120° C.) for 5 minutes to decrease water content thereof down to 5-13% so that a homogenized mucilaginous dope is formed; g. Via spunbond method, the dope is forcedly spun out of spin nozzles for converting it into natural cellulose filaments, and draw the natural cellulose filaments by an airflow draw jet device or airflow draw stretcher to become uniform fine natural cellulose filaments, then bond and overlay these fine natural cellulose filaments on existing substrate fibrous web of natural bio-polyamide 6,10 filaments on the conveyer in step d to form an overlaid fibrous web; h. The fine fibrous web of the bio-polyamide 6,10 and natural cellulose is coagulated with regeneration by means of ejecting mist aerosol of water to become fibrous composite web, then the dissolving solvent of N-methylmorpholine N-oxide (NMMO) is washed out by water rinsing; and i. After post treatments of hydro-entangled needle punching, drying, winding-up processes have been orderly applied, then the fibrous composite web of the bio-polyamide 6,10 and natural cellulose is converted into nonwoven fabric of continuous filament with hygroscopic metastatic feature.