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.

This invention relates to the process of a kind of ultra-low contraction polyester fiber industry filament, which introduces the spinning and stretch one-stage process, including: solid phase increases sticks, melting spinning, high temperature stretches, heat setting, coiling formation. This invention adopts the innovative 5 pairs of hot rollers stretch heat setting technique, in comparison with the tradition 4 pairs, which adopts the 2-step heat stretch and 2-step heat setting. The new level heat setting processing method can reduce the textile fiber stretch speed effectively, lengthen the textile fiber heat setting time, and enables the textile fiber possessing evenly stable orientation structure, which guarantees product physics performance, optimizes the spinning condition. This ultra-low contraction polyester fiber industry filament preparation method provided with polyester fiber industry having high density, big module, small elongate, good heat-resisting performance, resisting impingement, and bearing the fagged performance.

The invention relates to super-low shrinkage type sun shading cloth and a preparation method thereof. A super-low shrinkage polyester industrial filament is prepared by solid phase polycondensation tackifying, melting, metering, extrusion, cooling, oiling, stretching, heat setting and winding of modified polyester and then is woven to obtain a fabric layer; the fabric layer is subjected to two-dipping and two-rolling coating to synthesize polyurethane resin; the polyurethane resin is dried and baked to obtain the super-low shrinkage type sun shading cloth; when the sun shading cloth is cooled,the vertical height is kept unchanged and the cross section area of a slow cooling chamber is increased; at the same time, the slow cooling chamber maintains the plate surface temperature of a spinneret plate by the way of heat preservation. An oil agent for oiling contains crown ether, and the fabric layer is made of modified polyester having a molecular chain including a terephthalic acid chainsegment, an ethylene glycol chain segment and a diol chain segment with a branched chain. The preparation method is simple, the finally prepared super-low shrinkage type sun shading cloth has the dryhot-shrinkage rate of 2.2+ / -0.35% under the conditions of 190 DEG C, 15 min and 0.01 cN / dtex, and the mechanical properties are good.

The invention relates to a method that uses equal benzene tetracarboxylic acid anhydride making high modulus ultralow shrinking industrial yarn that includes the following steps: sending normal polyethylene terephthalate or normal polyester precrystallization and drying into screw extruder, adding expanding agent, setting outlet pressure and heating temperature of screw extruder to gain high viscosity polyester melt; putting the polyester melt into spinning box to take spinning to make high modulus ultralow shrinking industrial yarn. By using the method, the device investing and producing cost would be lowered, and the polyester industrial yarn is high intention high modulus and ultralow shrinking.

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.

The invention relates to a high-modulus low-shrinkage stiff cord and a preparation method thereof. The preparation method comprises the following steps: performing solid-phase polycondensation-viscosity enhancement, melting, metering, extrusion, cooling, oiling, stretching, heat setting and winding to obtain high-modulus and low-shrinkage polyester industrial yarns; twisting to obtain a cord; making the cord into a high-modulus low-shrinkage stiff cord by a two-bath impregnation method, wherein during cooling, the longitudinal height is kept constant and the cross-sectional area of a slow cooling chamber is increased; meanwhile, the surface temperature of a spinneret plate is kept in a heat preserving way in the slow cooling chamber; an oiling agent contains 67.30 to 85.58 percent by weight of crown ether; during use of the oiling agent, 14 to 18 percent by weight emulsion is prepared with water. The preparation method disclosed by the invention is simple; the prepared high-modulus low-shrinkage stiff cord is made from modified polyester of which the molecular chain includes a terephthalic acid chain segment, an ethylene glycol chain segment and a dihydric alcohol chain segment with a branched chain, is greater than or equal to 80N in breaking strength, and is greater than or equal to 37KN / m in cord bonding strength.