43results about How to "Low dry heat shrinkage" patented technology

The present invention provides a cellulose fiber having high strength, high modulus of elasticity, and low shrinkage properties, and excellent performance in preventing fibrillation and adhesion to rubber. It is produced by dissolving 0.1% to 10% by weight of salt and polyvinyl alcohol in a liquid concentrated NMMO solution to produce an NMMO solution; mixing, swelling, and dissolving the NMMO solution and cellulose powder to produce a cellulose solution Extrude and spin the cellulose solution through a spinning nozzle with 500 to 2000 spinneret holes, and then solidify it through an air layer and a coagulation bath to obtain multifilaments; wash the obtained multifilaments with water, Drying, oiling and coiling.

The invention discloses one-step method high-temperature and high-pressure melt spinning equipment and a production method of a polymer fiber and relates to the one-step method high-temperature and high-pressure melt spinning equipment. The spinning equipment is characterized by comprising a driving device, an extruder system and a spinning device, wherein the driving device comprises a driving motor and a speed reducing device; the extruder system comprises an extruder screw, a charging barrel, a loading hopper, an electric heater and an extruder head; the loading hopper and the electric heater are arranged on the charging barrel of an extruder; one end of the extruder screw is connected with the driving motor through the speed reducing device; the other end of the extruder screw is matched with the extruder head. The spinning equipment also comprises a melt filtering device, a metering pump, a spinning box body and a spinning component. The spinning device sequentially comprises the metering pump, the spinning box body, the spinning component, a spinneret plate, a coldness alleviating deice, a multifilament bundling device, an oiling device, a guide device, a hot roller drafting sizing device and a winding device. The high-temperature and high-pressure melt spinning equipment is special for melt spinning of polymers with high melting point, high melt viscosity and high performance, such as polyether-ether-ketone, polyaryletherketone and polyetherimide.

The invention relates to a method for producing polyester staple fiber specially used for high-strength middle-stretching non-woven fabric, mainly comprises the processing steps as follows: the raw materials: phthalic acid and ethylene glycol are mixed and stirred and sequentially enter a primary esterification reactor and a secondary esterification reactor for esterification reaction; subsequently, the materials sequentially enter a primary polycondensation reactor, a secondary polycondensation reactor and a final polycondensation reactor for polycondensation reaction; the produced polyestermelt is spinned, cooled, coiled, stored, collected as bundles, stretched, tensioned and thermally shaped, curled, loosened and thermally shaped, cut off and finally packaged so as to prepare the polyester staple fiber specially used for high-strength middle-stretching non-woven fabric; the secondary esterification reactor is internally provided with 300-600ppm of Di-n-butyl Phthalate; and the characteristic viscosity of the polyester melt is controlled to be 0.64-0.66, the spinning temperature is controlled to be 295-300 DEG C, the blowing temperature of a blowing device is 25-28 DEG C and the temperature for loosening and thermal shaping is 130-150 DEG C. The method can ensure the fracture strength of the fiber and has proper elongation at break and dry-hot shrinkage.