Patent ID: 9745680
Date: 2017-08-29
CPC Classifications: D01D,D01F,D01G,D04H,D10B

Claim:
1. A stapled melt spinning method for producing non-woven 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 melt spinning method, the melt is forcedly spun out of spin heads to form filaments of bio-polyamide 6,10, then draw and collect the filaments into fibrous tow of bio-polyamide 6,10; d. Extend the fibrous tow of bio-polyamide 6,10 into certain specification of fiber size, then cut the filaments in the fibrous tow of bio-polyamide 6,10 into staples of bio-polyamide 6,10 with specific length; e. Card and spread the staples of bio-polyamide 6,10 on a conveyer to form a substrate fibrous web of bio-polyamide 6,10 with thickness in range of 0.3-2.5 mm; f. Prepare pulp as raw material with content cellulose over 65% and degree of polymerization (DP) in range of 500-1500; g. 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; h. Via melt spinning method, the dope is forcedly spun out of spin heads into natural cellulose filaments, then draw and collect the filaments into fibrous tow of natural cellulose filaments; i. Extend and cut the filaments in the fibrous tow of natural cellulose filaments into staples of natural cellulose fibers with specific length; j. Card and overlay the staples of natural cellulose fibers on existing substrate fibrous web of bio-polyamide 6,10, which is previously created on the conveyer in step e, to form an overlaid fibrous web of the bio-polyamide 6,10 and natural cellulose on the conveyer; k. The overlaid 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 l. 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.