1180 results about "Heat setting" patented technology

The present invention discloses a high-performance base film for composite current collector and a preparation method thereof, the method comprising the following steps: S1, mixing PP masterbatch with composite modified auxiliary particles, melt extruding, cooling to obtain a cast sheet; S2, preheating the cast sheet and biaxially stretching it to obtain a stretched sheet; S3, heat setting, cooling, and obtaining a rough product; S4, performing surface corona treatment on the rough product; S5, winding, aging treatment, and slitting to obtain a high-performance base film for composite current collector. The present invention can well solve the problem of poor copper adhesion of conventional PP base films, and can also significantly improve the flame retardant properties and tensile strength of the PP base film, which is conducive to promoting the large-scale application of PP materials in composite current collector base films.

The invention relates to the technical field of polyester fibers, in particular to a high-strength wear-resistant polyester fiber and a preparation method thereof. The invention aims to solve the problem that the mechanical strength and wear resistance of the existing polyester fiber are difficult to consider at the same time. The preparation method comprises the following steps: carrying out esterification and polycondensation on terephthalic acid, ethylene glycol, hydroxyl-terminated polydimethylsiloxane and isophthalic acid to obtain modified PET; the preparation method comprises the following steps: respectively carrying out oxidation treatment on graphene and a multi-walled carbon nanotube, and then adding polyether amine for grafting; carrying out melt blending with PET slices to obtain nano master batches; carrying out melt blending on the chopped glass fibers and the PET slices to prepare micron master batches; and mixing the modified PET, the nano master batch and the micron master batch, carrying out ultrasonic dispersion, adding an auxiliary agent, and carrying out melt spinning, three-section stretching and three-section heat setting treatment to obtain the high-strength wear-resistant polyester fiber. Through the synergistic effect of the components and the process, the prepared fiber has excellent mechanical properties and wear resistance, and has wide application prospects in the fields of clothing, home textiles, industry and the like.

The invention discloses an ultra-high molecular weight polyethylene fiber melt spinning method which comprises the following steps: step 1, mixing ultra-high molecular weight polyethylene resin with polyethylene wax and high-density polyethylene to form a composition; 2, melting the composition at a high temperature to form a melt, carrying out melt spinning, and carrying out nozzle stretching and air cooling to obtain nascent fibers; and step 3, carrying out hot stretching and heat setting on the nascent fiber to obtain the final ultra-high molecular weight polyethylene fiber. By adopting the technical scheme, the melt flowability of the ultra-high molecular weight polyethylene can be greatly improved by the high-density polyethylene and the polyethylene wax, so that the ultra-high molecular weight polyethylene resin can be smoothly subjected to melt spinning. Meanwhile, in the hot stretching process, the polyethylene wax can participate in the crystallization process of the ultra-high molecular weight polyethylene resin and the high-density polyethylene, and finally the mechanical property of the ultra-high molecular weight polyethylene fiber can be well maintained.

The invention relates to a production process of a high-elasticity heat-resistant polyester yarn, which comprises the following steps: firstly, selecting high-molecular-weight polyethylene glycol terephthalate, adding 1-3% of nano filler and 5-10% of functional copolymer, and drying at 150 DEG C for 4-6 hours to improve the stability and processability of the material; secondly, melt extrusion is conducted at 280-290 DEG C, spinning is conducted through a multi-section temperature control spinning head, and the fiber cooling uniformity is effectively controlled. Then, two times of drafting and a heat setting process are adopted, the orientation degree of a molecular chain is improved in one time of drafting, and low-temperature plasma treatment is combined to optimize the surface activity and the setting effect of the fibers. In the secondary drafting, the fiber deformation is finely adjusted at low temperature, the thermal damage is reduced, the elasticity is improved, and finally, xylanase treatment and ultraviolet curing are combined, so that the softness, the skin-friendly property and the weather resistance of the fiber are remarkably improved.

The invention belongs to the field of polymeric membranes. The invention relates to a BOPLA (biaxially-oriented polylactic acid) film with high stretching ratio and a preparation method thereof. The packaging film comprises the following raw materials in parts by weight: 80-90 parts of PLA; 10 to 20 parts of PPC-P (Polypropylene Chloride-P); 10-15 parts of a plasticizer; 3.0 to 5.0 parts of a chain extender; 0.3 to 0.5 part of an antioxidant; 0.5 to 1.0 part of a lubricant; 0.1 to 0.3 part of an anti-hydrolysis agent; wherein the total mass of the PLA and the PPC-P is 100 parts; the preparation method comprises the following steps: mixing, extruding and plasticizing the raw materials according to the formula, and carrying out an asynchronous two-way stretching process, heat setting, traction, slitting and rolling. According to the present invention, the defects of mechanical property degradation and poor optical property of the PLA under the high stretching rate in the prior art can be effectively solved, and the great application potential is provided.

The invention relates to the technical field of composite fabrics, and discloses a preparation method of an antibacterial flame-retardant composite superfine fiber fabric, nylon 6 and low-density polyethylene are subjected to spinning, stretching and heat setting to obtain a fabric base layer, tris (2-chloroethyl) phosphate, p-dimethylaminobenzaldehyde and the like are used as raw materials, and the antibacterial flame-retardant composite superfine fiber fabric is prepared. Performing quaternization and amination reaction to obtain an antibacterial flame-retardant chain extender, and participating in synthesis of polyurethane to obtain a functional layer; the materials of all the layers are flatly laid according to the structure of the fabric base layer, the adhesive layer, the barrier layer, the adhesive layer and the functional layer, and the antibacterial flame-retardant composite superfine fiber fabric is obtained after hot-pressing compounding. The phosphorus and nitrogen elements and the Schiff base in the structure can block the exchange between the fiber matrix and oxygen and heat in the air, so that the flame-retardant effect is achieved; the quaternary ammonium salt cations interfere with metabolism of bacteria through electrostatic interaction, so that the bacteria die due to a'bacterial solution 'phenomenon, and an antibacterial effect is achieved.

The invention relates to the technical field of capacitor films. The invention discloses a preparation process of a multilayer polypropylene capacitance film, which comprises the following steps: S1, raw material preparation: preparing basic resin, a nano ceramic filler, a nucleating agent and an antioxidant into multilayer raw materials respectively; s2, fusing multiple layers of raw materials by an independent screw extruder, and compounding by a co-extrusion die head to form a film blank; and S3, carrying out air ring gradient cooling on the film blank. And S4, longitudinally and transversely stretching the film blank. And S5, performing heat setting in a segmented heating furnace, and performing corona treatment to improve surface energy. And S6, segmentally curing the moisture-proof coating by using an infrared oven. The multilayer heterostructure is adopted, the comprehensive performance of the capacitor film is improved through material matching, the dielectric constant, the breakdown strength and the moisture resistance are enhanced, and the problem of considering the dielectric property and the mechanical property is solved. The innovative process guarantees stable performance, is compatible with an existing production line, can realize large-scale production, meets the requirements of fields such as new energy and the like, and provides a feasible scheme for localization of high-performance capacitor films.

The invention relates to the technical field of microfiber material preparation, in particular to a preparation method of an insulating flame-retardant automotive interior microfiber material, which comprises the following steps: spinning sea-island fibers by taking PA6 as an island component and LDPE as a sea component and matching with master batches; performing opening, carding, lapping, pre-needling by a pre-needling machine and needling by a needling machine on the sea-island fibers to prepare non-woven fabric; carrying out heat setting on the non-woven fabric; preparing insulating flame-retardant polyurethane slurry, infiltrating the heat-set non-woven fabric to enable the non-woven fabric to be fully impregnated, and then feeding the non-woven fabric into an aqueous solution of dimethylformamide to be subjected to water bath curing, so as to prepare a semi-finished synthetic leather product; extracting sea components in the sea-island fibers from the synthetic leather semi-finished product by adopting a stripping process; and drying the reduced superfine fiber synthetic leather base cloth, immersing the base cloth into a softening agent aqueous solution, and then carrying out drying and leather rubbing treatment to obtain the insulating flame-retardant superfine fiber leather. The product provided by the invention is used for external protection of an intelligent auxiliary driving steering wheel sensing layer, and the resistance of the microfiber material reaches 1.2 megohm or above.

The invention relates to the field of fiber production, and particularly discloses a zinc oxide antibacterial ES fiber and a preparation method thereof. The zinc oxide antibacterial ES fiber comprises a core layer and a surface layer, and the surface layer comprises the following raw materials in parts by weight: 80-100 parts of polyethylene, 2-5 parts of a nano-zinc oxide composite material, 1-2 parts of a dispersing agent and 2-3 parts of a compatilizer; the nano-zinc oxide composite material is prepared from hydroxyapatite nanowires, a polyethylene glycol solution and coated nano-zinc oxide in a mass ratio of 1: (8-10): (1.5-2); the preparation method comprises the following steps: melting the material of the core layer to obtain a melt; mixing polyethylene, the nano-zinc oxide composite material, a dispersing agent and a compatilizer, and melting to obtain a polyethylene melt; and mixing the melt and the polyethylene melt, spinning, bundling, stretching, carrying out heat setting, curling and cutting off to obtain a finished product, the fiber has the advantages of being good in antibacterial property, high in mechanical strength, good in spinning stability and good in air permeability.

The invention provides a superfine denier profiled polyester staple fiber and a preparation method thereof.The preparation method includes the steps of raw material pretreatment, melt spinning, nascent filament treatment, heat setting and curling, oiling and cutting off and the like, polyester chips have high intrinsic viscosity and melting point, and under the action of six-zone temperature control, a high-hole-density spinneret plate and a high draft multiple, the polyester chips are subjected to melt spinning, so that the polyester chips are prepared into the superfine denier profiled polyester staple fiber. The superfine, special-shaped and hollow polyester staple fibers are prepared. The obtained polyester staple fiber has good breaking strength, rebound resilience and a low-defect structure, the bulkiness, flexibility and structural consistency of the fiber are remarkably improved, the environment and process limitation of a traditional sea-island fiber alkali stripping method is broken through, and the polyester staple fiber is suitable for the fields of high-end filling, plush imitation, non-woven materials and the like.

The invention discloses a polyacrylonitrile carbon fiber and a preparation method thereof, and the method comprises the following steps: (1) copolymerizing acrylonitrile and acrylamidine to obtain a polymer spinning solution; (2) sequentially carrying out spinning, solidification forming, first-stage drafting, washing, oiling, drying, second-stage drafting and heat setting on the polymer spinning solution to obtain a polyacrylonitrile precursor; and (3) sequentially carrying out pre-oxidation and carbonization treatment on the polyacrylonitrile precursor to obtain the polyacrylonitrile carbon fiber. Therefore, by adopting the method, the radial structure difference of the nascent fiber can be effectively controlled, the radial structure of the obtained nascent fiber is more homogeneous, and the radially homogeneous polyacrylonitrile precursor is obtained, so that the prepared carbon fiber is more excellent in performance or larger in diameter, and meanwhile, an ammonification process link is omitted.

The invention provides a preparation method of a polyolefin hollow fiber membrane, which comprises the following steps: S1, spinning: melting and extruding a polyolefin material to obtain a semi-molded product; s2, cooling crystallization: carrying out cooling crystallization on the semi-formed product to obtain nascent fibers; s3, primary shaping: carrying out heat setting treatment to obtain a heat-set semi-finished product; s4, cold drawing and hole forming are conducted, specifically, cold drawing treatment is conducted to obtain a cold-drawn semi-finished product; the cold drawing elongation rate is 20-40%, and the cold drawing rate is (10-30)% / min; s5, hot drawing and chambering are conducted, the hot drawing elongation rate is 2-6 times of the cold drawing elongation rate, and the hot drawing rate is not higher than 15% of the cold drawing rate; and S6, secondary setting: carrying out secondary heat setting treatment to obtain the hollow fiber membrane. According to the present invention, the rapid-drawing and less-drawing cold drawing process is adopted to cooperate with the slow-drawing and more-drawing hot drawing process, such that the porosity of the inner layer can be substantially improved on the basis of ensuring the compact degree of the skin layer, and the high dimensional stability of the prepared membrane filament can be ensured by the drawing process so as to achieve the service life and the degassing effect accidentally at the same time.

The invention discloses a preparation method of composite geotechnical cloth, belongs to the technical field of geotechnical material processing, and solves the problems of insufficient interlayer bonding strength, poor permeation stability and incapability of adapting to regional differentiation mechanical requirements in the traditional process. According to the method, two layers of synthetic fiber geotextile and a layer of polymer geomembrane are selected, and a gradient needling machine is adopted to implement a double-station gradient needling process, specifically, thick needle needling pre-reinforcement is synchronously conducted on the upper side and the lower side till the membrane thickness is 50-60% of the depth, then fine needle needling finishing is conducted till the membrane thickness is 70-80% of the depth, the needling density is preset to be 20-70 needles / cm according to different stress areas of a membrane material, and the needling density is 20-70 needles / cm according to different stress areas of the membrane material; in the process, data of needling depth, needling density and membrane material tension are collected in real time through a dynamic monitoring system, parameters are automatically adjusted, and finally a stable structure is formed through heat setting treatment at 120-140 DEG C for 8-12 minutes. The composite geotextile prepared by the method has a high-strength bonding interface and excellent anti-seepage performance, and is suitable for the engineering fields of water conservancy project anti-seepage, road base reinforcement, refuse landfill isolation and the like.

The invention relates to a method for preparing a coarse denier non-crimp dumbbell-shaped full-dull polyester staple fiber, wherein the full-dull polyester slice is dried, melted by a screw extruder, spun by a dumbbell-shaped special-shaped hole spinneret, cooled by short-distance blowing with a ring blow tube, wound, and dropped into a barrel to obtain a raw fiber, and the raw fiber is subjected to the steps of post-spinning bundling, first-stage oil bath drawing, second-stage steam drawing, tense heat setting, stacking and oiling, and cutting to obtain a coarse denier non-crimp dumbbell-shaped full-dull polyester staple fiber; the dumbbell-shaped special-shaped hole spinneret is The diameter is 220mm, the dumbbell-shaped hole length is 2.2±0.025mm, the dumbbell-shaped hole points to the center of the spinneret at 15°, the number of holes is 208, each circle has 52 holes, a total of 4 circles, the circle radial center distance is 9mm, the shortest distance from the spinneret surface to the top row of air holes of the ring blowing tube is 30mm, the wind speed is 1.7-1.8m / s; the winding speed is 1050-1150m / min; the nozzle stretching multiple is 160-190 times. The present invention effectively solves the problem that the coarse denier non-curled dumbbell-shaped full-dull polyester staple fiber has high defects and is dispersed.

The invention relates to a method for preparing a polyolefin film by using a volatile solvent, which comprises the following steps: (1) weighing polyolefin resin and a volatile organic solvent, stirring and fully mixing to obtain a uniform mixed solution; (2) feeding the obtained uniform mixed solution into a double-screw extruder to obtain a high-temperature melt, and carrying out curtain coating and cooling to obtain a membrane; and (3) stretching the obtained membrane to obtain a porous membrane, and carrying out heat setting to obtain a finished product membrane. Compared with the prior art, the method has the advantages that the solvent extraction process is reduced, the porosity of the membrane is adjustable in the range of 40-85%, the preparation process is green and environment-friendly, and the method has potential application in the fields of battery diaphragms, water treatment, breathable and moisture permeable fabrics and the like.

The invention relates to the field of mechanical engineering, and discloses a tentering setting production speed intelligent adjusting method and system, and the method comprises the steps: analyzing the thermal sensitivity, melting point, elastic coefficient and elastic modulus of a to-be-tentered textile; a heat setting curve of the to-be-tentered textile is constructed, the optimal setting temperature of the to-be-tentered textile is determined, and a heat setting control mechanism of the tentering setting machine is constructed; the stretching tension and the tentering tension of the to-be-tentered textile are calculated, the distance between spreading rollers and the speed of the spreading rollers of the tentering setting machine are analyzed, the cooling efficiency of the tentered textile is calculated, and a cooling control mechanism of the tentering setting machine is constructed; constructing a double-air-duct frequency conversion control module of the tentering setting machine; the tentering parameters of the tentering technological process are analyzed, the tentering state of the to-be-tentered textile in the tentering technological process is analyzed, the production speed parameters of the tentering setting machine are determined, and the production speed of the tentering setting machine is executed for intelligent adjustment. According to the invention, the production efficiency of tentering and shaping can be improved.

The invention discloses a high-strength wear-resistant yarn and a manufacturing method thereof, and belongs to the field of spinning, the manufacturing process sequentially comprises the steps of opening, carding, drawing, roving and spinning, the raw materials used for opening comprise 70 wt% of aramid fiber and 30 wt% of cotton; in the spinning procedure, single yarns are twisted firstly, then two single yarns are plied to obtain plied yarns, the twist degree of the single yarns is 900-950 twists / m, the two single yarns have the same twist direction, and the single yarns and the plied yarns have opposite twist directions; and carrying out heat setting treatment on the plied yarn to obtain the high-strength wear-resistant yarn. Aramid fibers and cotton fibers in a specific proportion are selected as spinning raw materials, single yarns with specific twist are made and then reversely twisted to form plied yarns, finally, internal stress of the yarns is eliminated through heat setting treatment, the twist is stabilized, creep deformation in use is reduced, and the prepared yarns can be used in the industrial field, daily supplies, outdoor equipment and other products needing high wear resistance and have wide application prospects. The fabric is comfortable and soft, and the durability is improved.

The invention relates to the technical field of shoemaking equipment, in particular to a cold and hot setting machine for shoe processing and a setting technology.The cold and hot setting machine for shoe processing comprises a machine body, a hot mold assembly, a shoe mold assembly and a cold mold assembly, the hot mold assembly is arranged on one side of the machine body and used for conducting heat setting on toe cap fabric, and the cold mold assembly is arranged on the other side of the machine body; the shoe mold assembly and the cold mold assembly are both arranged on the machine body, the cold mold assembly is opposite to the shoe mold assembly in the vertical direction, and the cold mold assembly is used for conducting cold setting on the shoe head fabric obtained after heat setting. The middle flexible pressing pads are arranged, materials at the thick positions of the turnup parts are promoted to be dispersed to all positions of one circle of the turnup parts through intermittent rotation of the two middle flexible pressing pads, so that the thickness consistency of all positions of one circle of the toe cap fabric is improved, and in the subsequent cooling and shaping process of the toe cap fabric, the thickness uniformity of the toe cap fabric is improved. The cooling speeds of all parts of the toe cap fabric in one circle are basically consistent, so that the cooling and shaping effects of the shoe mold assembly on the toe cap fabric are better.

The invention discloses a high transparency and high toughness polyamide fiber preparation method, which comprises: S10: carrying out melt blending on polyamide and an ethylene-alpha-olefin copolymer elastomer, and extruding under the high shear action to obtain a modified melt; s20, the modified melt is extruded through a spinneret plate to form nascent filaments, the nascent filaments are fed into a cooling area to be rapidly cooled, and nascent fibers are obtained; the retention time of the nascent filaments in the cooling area is 0.1-0.3 second, nitrogen is adopted as a cooling medium in the cooling area, and the temperature of the nitrogen is 10-14 DEG C; s30, carrying out hot stretching treatment on the nascent fiber to obtain a stretched fiber; and S40, carrying out heat setting treatment on the stretched fiber to obtain the polyamide fiber. The polyamide fiber prepared by the method has good toughness and relatively high transparency.

The invention discloses a polylactic acid fiber and a spinning process thereof, and belongs to the technical field of chemical fiber preparation. The spinning process comprises the following steps: (1) carrying out melt blending on a heat-resistant anti-ultraviolet agent PLA-TiO2-N / SiO2 and polylactic acid slices to obtain heat-resistant anti-ultraviolet polylactic acid slices; and (2) carrying out melt spinning, winding, drafting and heat setting on the heat-resistant anti-ultraviolet polylactic acid slices to obtain the polylactic acid fiber. In the process of preparing the heat-resistant anti-ultraviolet agent, firstly, polylactic acid is grafted on titanium dioxide, and KH550 is used for carrying out amination modification on silicon dioxide, so that the silicon dioxide is also grafted on the polylactic acid, and PLA-TiO2-N / SiO2 which has good compatibility with polylactic acid fibers and has a heat-resistant effect and an anti-ultraviolet effect is prepared. Further, the polylactic acid fiber with excellent ultraviolet resistance and heat resistance is prepared.

The invention discloses a preparation method and application of a conductive fiber material with tensile negative resistance response. The preparation method comprises the following steps: S1, performing melt spinning on polyester to obtain polyester filaments; s2, performing drafting, false twisting and heat setting on the polyester filament yarns to form polyester tensile deformation grid yarns; s3, immersing the polyester tensile deformation grid yarns in a Tris buffer solution, and adding dopamine to polymerize the polyester tensile deformation grid yarns to form a polydopamine layer; s4, the polyester grid yarn with the polydopamine layer is soaked in a solution containing silver ions, and the silver ions are chelated with amino and phenolic hydroxyl groups in polydopamine; and S5, reducing silver ions on the surface of the fiber into silver nanoparticles through an in-situ reduction reaction, and uniformly loading the silver nanoparticles on the surface of the polyester mesh yarn by utilizing the adsorption effect of polydopamine. The conductive fiber prepared by the method disclosed by the invention has negative resistance response, and is suitable for the fields of intelligent wearable textile equipment, medical monitoring equipment and textile materials needing conductive and antibacterial properties at the same time.

The invention discloses a continuous twisting preparation method and system for spiral fiber artificial muscle. The preparation method comprises the following steps: keeping first tension, continuously releasing original fibers at a first pay-off rate, performing twisting treatment, and collecting at a first take-up rate to obtain spiral twisted fibers; the second tension is kept, the spiral twisted fibers are continuously released at a second pay-off rate, the spiral twisted fibers are collected at a second take-up rate after being subjected to annealing treatment, the spiral fiber artificial muscle is obtained, and the second pay-off rate is smaller than the second take-up rate. According to the continuous twisting preparation method provided by the invention, real-time monitoring and automatic adjustment of tension in the fiber preparation process are realized, so that constant tension during continuous fiber preparation is ensured, and meanwhile, the annealing tension is directly associated with the spring index of the artificial muscle fiber through the continuous annealing heat setting device; an industrialization solution is provided for diversified application of the artificial muscle, continuous preparation is achieved, and the preparation efficiency is remarkably improved.

The utility model relates to the technical field of cutting devices, in particular to a slitter edge cutting device of a weaving machine, which comprises a cutting tool, and further comprises a cutting seat which is detachably mounted on a cloth supporting roller and comprises a tool apron provided with a supporting plate, a lifting cavity is arranged on the tool apron, and the cutting tool reciprocates up and down in the lifting cavity through a transmission component; the carding assembly comprises a mounting frame, a carding guide roller is arranged on the mounting frame, a hot air bin is arranged on the side, away from the waste edge, of the carding guide roller, and a roller body of the carding guide roller is wrapped with a wetting layer used for being soaked with liquid; according to the waste edge cutting device of the weaving machine, the waste edge cutting effect and quality can be improved, subsequent cutting procedures can be reduced, and the production efficiency can be improved; according to the device, the cutting tool is continuously driven to cut through the transmission assembly, the carding assembly can straighten bent or applied waste edge line ends through the hot air bin in cooperation with the dredging roller and then conduct heat setting, and the bent or applied waste edge line ends of the part can be cut easily.

The invention relates to the technical field of aramid fibers, in particular to a high-strength modified meta-aramid fiber and a preparation method thereof. The meta-position aramid fiber overcomes the problem that the meta-position aramid fiber is poor in mechanical property and ultraviolet resistance. The preparation method comprises the following steps: taking MPD and DDS as diamine solids to react with IPC in a polymerization solvent to generate PMIA; the preparation method comprises the following steps: carrying out surface activation treatment on BNNS to prepare f-BNNS; the preparation method comprises the following steps: carrying out surface grafting and activating treatment on TiO2 to prepare ultraviolet-resistant nano TiO2; pMIA, the composite nano suspension and DDSM are mixed in NMP and defoamed to prepare a modified polymer spinning solution, and the high-strength modified meta-aramid fiber with good mechanical properties and ultraviolet resistance is obtained through dry spraying-wet spinning, gradient cleaning, three-stage hot stretching, heat setting, hot drying and rolling.

The invention relates to a polyester film for an electronic tag and a preparation method thereof.According to the polyester film for the electronic tag, a five-layer co-extrusion structure is adopted, a maze effect is formed through nano clay, the gas diffusion path is prolonged by 10-20 times, the symmetrical core layer design is adopted, stress balance is achieved, the bending rigidity is improved, and the service life of the electronic tag is prolonged. According to the preparation method of the polyester film for the electronic tag, a synchronous two-way stretching technology is adopted, the problem of inconsistent directional shrinkage after two-way stretching is solved, a staged heat setting process is adopted, segmented temperature control is matched with slow cooling, residual internal stress is reduced, the thermal expansion coefficient is reduced by adding the carbon nanotubes, and therefore the overall performance is improved, and the service life is prolonged.

The invention relates to an all-cotton four-way stretch fabric and a preparation method thereof, and belongs to the technical field of textile dyeing and finishing. The preparation method comprises the following steps: performing singeing, enzyme desizing, liquid ammonia finishing, loose alkali shrinkage and overfeeding soft heat setting on gray fabric to obtain the all-cotton four-way stretch fabric. The warp-wise and weft-wise shrinkage rates of the prepared four-way stretch fabric are-3.0%-0%, the warp-wise elastic elongation rate is 12%-15%, the weft-wise elastic elongation rate is 12%-18%, and the elastic residual elongation rate is smaller than or equal to 8%; obvious warp and weft elasticity can be achieved without elastic fibers, the problems that elastic fabrics such as spandex core-spun yarn fabrics are complex to manufacture, unstable in fabric size and the like are solved, the warp and weft elasticity is obvious, the size stability is good, the hand feeling is soft, and the price is low; the preparation method is simple, does not need equipment transformation, is easy to operate and does not damage fiber strength.

The invention discloses a fabric heat setting density real-time control method, and particularly relates to the technical field of fabric density intelligent control. Comprising the steps of S01, fabric image three-dimensional grid frame division, S02, fabric image information collection, S03, fabric heat setting stability judgment, S04, fabric heat setting density control, S05, fabric heat setting density detection and analysis and S06, fabric heat setting density detection and evaluation. The method comprises the following steps: acquiring fabric image data of each monitoring sub-grid of a three-dimensional grid frame of a target fabric image, calculating a fabric heat stability process effect index and a fabric heat setting density control index, performing fabric density control, and further analyzing to obtain a fabric heat setting density quality detection coefficient. The method can improve the accuracy of data acquisition, can automatically calculate and timely feed back through data analysis, is favorable for improving the intelligent level and quality of the production process, and is suitable for real-time density control of different types of fabric materials.

The invention provides a preparation method of fluoride-free anti-wicking polyester industrial yarn, and belongs to the technical field of polyester fibers. The preparation method comprises the following steps: preparing a hydrophobic oil agent by taking a polyurethane polymer or a polyurethane prepolymer as a main body; polyester chips are guided into a screw extruder to be subjected to melt extrusion and then flow out through a spinning assembly, and after primary oiling, drafting and heat setting are conducted, secondary oiling is conducted through a hydrophobic oil agent; and dynamically heating the tows subjected to secondary oiling through multiple rollers to finish fiber shaping and oil film curing, and winding to obtain the finished fluoride-free anti-wicking polyester industrial yarn with the wicking height of less than or equal to 7.5 cm. According to the invention, fluorine-containing waterproof oil agents such as C8 and C6 which are commonly adopted by current anti-wicking fibers are abandoned, polyurethane materials which have no toxic and harmful effects on human bodies are used as the anti-wicking oil agents, and the anti-wicking fiber has the characteristics of environmental protection, flexible oiling point location and simple and convenient operation, and can be easily realized by being matched with an existing melt spinning device.

The invention relates to a bi-component fiber and a preparation method thereof, polyester melt and polyamide melt are extruded from a spinneret plate side by side, cross air blowing cooling is performed to obtain nascent fiber, and then the nascent fiber is sequentially subjected to heat pipe heating, oiling, pre-interlacing, three-roller drafting heat setting and winding to obtain the bi-component fiber. The heat pipe is used for heating nascent fibers, and the temperature of the heat pipe is 90-100 DEG C; the three rollers comprise a first hot roller, a second hot roller and a third hot roller; the temperature of the first hot roller is 70-90 DEG C, the temperature of the second hot roller is 110-130 DEG C, and the temperature of the third hot roller is 140-160 DEG C; the filament number of the prepared bi-component fiber is 2.6-3.5 dtex, the breaking strength is larger than or equal to 3.23 cN / dtex, the elongation at break is 27.45-38.31%, the number of broken ends is smaller than or equal to 2.3 times / (48 bits. 24 hours), and the broken filament rate is stably controlled to be 0.30% or below. According to the preparation method, generation of internal stress is greatly reduced; the mechanical property of the bi-component fiber is improved, and the number of broken ends and the broken filament rate of the fiber are obviously reduced.

The invention discloses a polyphenylene sulfide fiber pps filter bag, and relates to the technical field of filter materials. The invention discloses a preparation method of a polyphenylene sulfide fiber pps filter bag, which comprises the following steps: carrying out melt extrusion granulation on polyphenylene sulfide and modified silicon dioxide to obtain granules; carrying out melt-blowing spinning, heat setting and hot rolling on the granules to obtain a pps filter bag; the modified silicon dioxide is obtained by modifying aminated mesoporous silicon dioxide with ethylenediamine tetraacetic anhydride and then carrying out epoxy treatment with epichlorohydrin. The prepared modified silicon dioxide is added into polyphenylene sulfide for granulation and melt-blowing treatment, the obtained polyphenylene sulfide fiber has the advantage of being good in mechanical property, the prepared polyphenylene sulfide fiber is used for preparing a pps filter bag, the prepared filter bag is applied to filtering treatment of high-temperature flue gas, the advantages of oxidation resistance and cross-linking resistance are achieved, and the application prospect is wide. And high filtering precision and trapping effect are achieved when smoke is filtered in a hot oxygen environment.