42results about How to "Low dry heat shrinkage" patented technology

The invention discloses a one-step production technology of ultra-low shrinkage terylene industrial fibers, which comprises the steps as follows: A. the preparation of high-viscosity chips: the high-viscosity chips with the viscosity of 0.99 plus or minus 0.015 are obtained by the solid phase polymerization of low-viscosity chips; B. melt spinning: the high-viscosity chips are extruded by melting by a screw extruder in a spinning manifold, spun by a spinning component, and shaped by lateral blowing cooling, and pump oiling is carried out by adopting an ester leveling agent with the kinematic viscosity of 20 to 60mm<2>/s at the temperature of 30 DEG C, and the oiling rate is 0.6 plus or minus 0.15 percent; C. heat setting by drawing: heat setting by drawing is carried out firstly by a pre-tension roller, and sequentially by two groups of drawing rollers and three groups of hot rollers for shaping; and D. shaping by winding: products can be obtained by winding by a winding head after the obtained fibers pass through a main network device. In the invention, not only the technology has high production efficiency, but also the dry heat shrinkage value of the obtained ultra-low shrinkage terylene industrial fibers is low and has high strength and excellent combination property.

The invention relates to a low-shrinkage high-strength polyester industrial yarn and a preparation method thereof. The preparation method comprises: carrying out solid phase condensation polymerization tackifying on a modified polyester, melting, metering, extruding, cooling, oiling, drawing, carrying out heat setting, and winding, wherein the unchanged longitudinal height is maintained during thecooling, the cross section area of the slow cooling chamber is increased while the plate surface temperature of the spinning plate is maintained by using the thermal insulation method, and the oil agent for oiling contains 67.30-85.58 wt% of crown ether. According to the present invention, the preparation method is simple; the material of the prepared low-shrinkage high-strength polyester industrial yarn is the modified polyester with the molecular chain including a terephthalic acid chain segment, an ethylene glycol chain segment and a diol chain segment having the branched chain, the fracture strength is more than or equal to 7.3 cN/dtex, and the dry heat shrinkage rates at the conditions comprising 177 DEG C, 10 min and 0.05 cN/dtex and the conditions comprising 190 DEG C, 15 min and 0.01 cN/dtex respectively are 1.8+/-0.5% and 3.5+/-0.5%.

The invention discloses a manufacturing method for high-modulus low-shrinkage PET industrial yarn, and the technological process of the method is as follows: hyperviscous melting to polyester fiber raw materials, metering, spinning, cooling, oil applying, stretching, hot shaping and reeled forming, wherein the cooling process sequentially comprises four parts including slow-cooling, pre-cooling, calm zone cooling and blow cooling, and the pre-cooling part adopts a passive hollow ring-shaped belt device. Through the introduction of the pre-cooling device, the irregularity caused by tows quivering produced under the down moving of a solidification point of fiber can be reduced, the deviation ratio of linear density can be controlled within a lower range, the purpose of reducing orientation and crystallization of embryo fiber is achieved, finally high-modulus low-shrinkage PET industrial yarn can be obtained, the high-modulus low-shrinkage PET industrial yarn has the advantages of high modulus, low dry heat shrinkage percentage, low breaking elongation and low linear density deviation ratio, and practical application can be well met.

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 low-shrinkage polyester industrial filament and a preparation method thereof. The preparation method comprises that modified polyester is subjected to solid phase polycondensation tackifying, melting, metering, extrusion, cooling, oiling, stretching, heat setting and winding, wherein an oil agent for oiling contains crown ether, and the content of the crown ether is 67.30-85.58 wt%. The preparation method is simple and reasonable; the dry-hot shrinkage rate of the finally prepared low-shrinkage polyester industrial filament under the conditions of 190 DEG C, 15 min and 0.01 cN/dtex is 2.5-4.7%. The low-shrinkage polyester industrial filament is made of the modified polyester, and a molecular chain of the modified polyester consists of a terephthalic acid chain segment, an ethylene glycol chain segment and a diol chain segment with a branched chain, and diol with the branched chain has the following structural formula defined in the specification, wherein R1 and R2 are independently selected from straight-chain alkylene with the carbon atom number of 1-3, R3 is selected from alkyl with the carbon atom number of 1-5, and R4 is selected from alkyl with the carbon atom number of 2-5.

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 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.

The invention provides a manufacturing method of a large-diameter and high-viscosity polyester monofilament. The method comprises the working procedures of tackifying low-viscosity polyester chip raw material by polyester solid phase polycondensation to increase the intrinsic viscosity to be eta which is within the range of 0.9-1.0; drying the tackified polyester chip by a vacuum polyester dryer for crystallization, and enabling the water content of the polyester chip to be lower than 100ppm; melting the dried polyester chip to form polyester melt; evenly extruding the polyester melt by a metering pump, and forming primary monofilament by a mould; stretching the primary monofilament twice respectively in a prestretching way and an all-stretching way; shaping the stretched primary monofilament to form the large-diameter and high-viscosity polyester monofilament. The product obtained by the method can overcome the defects in the prior art, and avoids the phenomena of melt fracture and filament break increase caused by the overhigh intrinsic viscosity of the polyester chip raw material and the overlarge molecular weight of the polyester chip. Furthermore, by adopting the special drying procedure, the method reduces the dry heat shrinkage rate of the monofilament and improves the breaking strength of the monofilament.

The invention relates to a spinning device with seven pairs of rollers and a technology for producing terylene industrial yarns by adopting the same, and belongs to the technical field of production of terylene industrial yarns. The spinning device with the seven pairs of the rollers comprises a spinning component and seven pairs of the rollers arranged below the spinning component; each of the seven pairs of the rollers is composed of two rollers with the same center distance as 40-100 mm; the first pair of rollers is closest to the spinning component; the second pair of the rollers is located below the first pair of the rollers; the third pair of the rollers is located at the right side of the first and second pairs of the rollers; the fourth and fifth pairs of rollers are located at the right side of the third pair of the rollers. The spinning device with the seven pairs of the rollers can match with chip spinning and melt direct spinning respectively, the production way is flexible, and production of low-shrink terylene industrial yarns and common high-strength terylene industrial yarns can be realized through adjusting the roller speed, roller temperature and position setting of each pair of the rollers.

The invention provides a heat-resistant impregnated synthetic fiber canvas and a formula of an impregnating adhesive solution needed by an impregnation process. The warp yarns refer to low shrinkage activated industrial polyester filaments, the weft yarns refer to high-strength polyhexamethylene adipamide fibers, the dry heat shrinkage of the finished canvas can reach a small value at the environment temperature of 175 DEG C, the adhesive force between the canvas layer and rubber at high temperature is enhanced by adopting a special impregnating adhesive solution formula, and separation between the adhesive layer and the canvas layer in the conveyor belt operating process is avoided.

The invention relates to a regenerated polyester staple fiber and a preparation method thereof. The preparation method mainly comprises the following steps of sorting recycled polyester bottles, removing tags, primarily cleaning, and crushing into PET (polyethylene terephthalate) slices; drying the PET slices, adding 0.01 to 0.015wt% of whitening powder, 0.05 to 0.09wt% of zinc oxide powder and 3 to 5wt% of polyester chain extender; melting, blending, spinning, drawing, drying and shaping. The regenerated polyester staple fiber and the preparation method thereof have the advantages that by controlling the technology conditions of temperature, time and the like in the processing and manufacturing process, and using the polyester chain extender, the dry heat shrinkage rate of the polyester staple fiber is reduced; the comprehensive property of the regenerated polyester staple fiber is better, and the spinning property of the regenerated polyester is effectively improved.

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 discloses a production method of PET industrial yarns. The method comprises the technological steps of (1) preparation of high-viscosity slices, (2) spinning, (3) drafting and (4) winding, wherein at the step (3), drafting, thermal shaping and loosening are conducted by six pairs of drafting rollers under a certain spinning speed. The invention aims to provide the production method of the PET industrial yarns. The method is used to prepare the PET industrial yarns with good shrinkage characters. The method is applicable to production of wide fabrics; and demands for film structure materials can be satisfied.

The invention relates to a multifunctional rubber dipping machine for preparing a chinlon 6 cord fabric. The multifunctional rubber dipping machine is characterized in that the multifunctional rubberdipping machine comprises a system rack, the system rack sequentially comprises an unwinding device, a front traction device, a slow storage cloth device, a middle traction device, a dipping host, a front drying room, a rear drying room, a first roller set, a stretching drying room, a second roller set, a shaping device, a third roller set, and a winding device along the cord fabric from front toback. The multifunctional rubber dipping machine for preparing the chinlon 6 cord fabric has the advantages of high production efficiency, high energy utilization rate, and low product dry-heat shrinkage rate.

The invention belongs to the technical field of polymer fiber production, and particularly relates to a preparation method of a gum dipping cord fabric for a passenger radial tire. The preparation method comprises the following steps of through solid-phase polymerization, taking a polyester wet slice as a raw material, and heating to fully activate low-molecular terminal hydroxyl and carboxyl of polyester so as to form a high-viscosity PET slice; then carrying out a spinning procedure of a melting process to produce high-strength protofilaments; twisting the high-strength protofilaments on a direct twisting machine through a twisting process; weaving the twisted re-twisted yarns on an air jet loom; and finally, carrying out a gum dipping process by using a gum dipping solution mainly comprising blocked isocyanate and epoxy resin. The preparation method has the advantages that the produced product is high in strength, good in definite elongation and small in dry heat shrinkage rate, and is used for replacing a conventional 1100dtex/2 product, so that the effects of reducing the cost and enabling the tire to be lighter in weight are achieved.