Spunbond method for producing non-woven fabric with deodorant feature from bamboo cellulose

A spunbond method for producing non-woven fabric with deodorant feature from bamboo cellulose comprises the following process steps:

• a. selecting bamboo pulp and wasted coffee residue as raw materials to blend together mutually into a bamboo pulp mixture, wherein a cellulose content of the bamboo pulp is over 50% and a range for degree of polymerization (DP) is 350-750, and said wasted coffee residue having been ground into a size range of 500-900 nm granules in high speed mode;
• b. putting N-methylmorpholine N-oxide (NMMO) as a primary dissolving solvent and 1,3-phenylene-bis 2-oxazoline (BOX) as an additive stabilizer into the bamboo pulp mixture for blending and dissolving under low temperature in a range of 50-70 degree centigrade (50-70° C. ) via rapid grinding using a horizontal dope blending machine;
• and, by means of cellulose features of high expanding, moistening and dissolving ability as well as high rate of dissolving speed affected by the NMMO to expedite a mutually blending and dissolving effect for forming a slurry;
• then, dehydrating the slurry via heating up to a temperature in a range of 80-100 degree centigrade (80-100° C. ) using a vacuum thin film evaporator (TFE) for 5 minutes to decrease a water content thereof to an range down to 5-13% so that a homogenized mucilaginous dope is formed;
• c. via a spunbond method, the mucilaginous dope is firstly fed into and extruded out of an extruder, henceforth the mucilaginous dope is fed into a spin-pack and forcedly spun out of spin nozzles by means of a gear pump, afterward external compressed quenching air is continuously blown through for cooling and preliminarily drawing the mucilaginous dope for converting the mucilaginous dope into bamboo cellulose filaments by means of an air gap by latterly drawing the bamboo cellulose filaments using an airflow draw jet device to become bamboo filaments of fibrous strand, wherein the ranges for distance of the air gap, temperature and relative humidity of the quenching air are 2-30 cm, 5-35 degrees centigrade (5-35° C. ) and 60-90% respectively;
• d. coagulating and regenerating the bamboo filaments of fibrous strand in a coagulating liquid, by drawing the bamboo filaments of fibrous strand using the airflow draw jet device with drawing speed thereof in a range of 20-3000 m/min to become uniform fine bamboo cellulose filaments, then bonding and laying said bamboo filaments of fibrous strand on a belt collector to form a webbed nonwoven wherein the ranges for temperature of the coagulating liquid and concentration for existing NMMO of dissolving solvent are 5-30 degrees centigrade (5-30° C. ) and 0-30 wt % respectively;
• and
• e. in after post treatments of water rinsing, orderly applying hydro-entangled needle punching and drying, wherein a resultant nonwoven fabric having continuous filament of bamboo cellulose with deodorant feature is produced from the webbed nonwoven,
• wherein the viscosity of cellulose for the dope in step b is in range of 6800-7600 poise,
• wherein the non-woven fabric of bamboo cellulose in above step d, a fineness (or fiber number) for fiber in range of 15-30 μm, and
• wherein the resultant nonwoven fabric has a deodorant capability of absorbing between 52.8 and 68.3%.