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1049results about "Artificial filament washing/drying" patented technology

Process for forming micro-fiber cellulosic nonwoven webs from a cellulose solution by melt blown technology and the products made thereby

This invention relates to a process of melt blowing a cellulose solution through a concentric melt blown die with multiple rows of spinning nozzles to form cellulosic microfiber webs with different web structures. The process comprises the steps of (a) extruding a cellulose solution (dope) through a melt blown spinneret with multiple rows of spinning nozzles; (b) drawing each individual extrudate filament to fine fiber diameter by its own air jet; (c) coagulating and entangling the fine fibers with a series of pressured hydro needling jets of recycling solution of the mixture of cellulose solvent and non-solvent in the spin-line; (d) collecting the stream of microfibers, air and needling jets on a moving collecting surface to form cellulosic fiber web; (e) hydro-entangling the said pre-bonded web downstream with at least one set of hydro needling jets of recycling solvent/non-solvent solution for forming well bonded nonwoven web; (f) regenerating the fine fibers in at least one bath for at least 5 seconds; (g) further regenerating and washing the fine fibers in another bath for at least 5 seconds; (h) pinching the well bonded melt blown cellulosic nonwoven with pressure rollers to remove major portions of the non-solvent; (i) drying the nonwoven web by heat, or vacuum or both, and (j) winding the nonwoven web into rolls.
Owner:BIAX FIBERFILM CORP

Method for preparing polyacrylonitrile carbon fiber protofilament by dry and wet methods

The invention discloses a method for preparing polyacrylonitrile carbon fiber protofilament by dry and wet methods. The method comprises the steps of polymerization, demonomerization and defoaming, filtration, coagulation, washing and drafting, oiling densification, steam drafting, heat setting and drying. Three-level coagulating baths at the temperature of between 10 DEG C below zero and 70 DEG C and with dimethyl sulfoxide with concentration of 10 to 60 mass percent are adopted in the coagulation step, and the first coagulating bath contains aqueous ammonia accounting for 0.05 to 1 percent of the mass of the first coagulating bath; and a spinning head is subjected to 1.5 to 5 times positive drafting in the first coagulating bath, and the drafting is 0 in the second and third coagulatingbathes. According to the method for preparing the polyacrylonitrile carbon fiber protofilament, the spinning process is stable, the broken filament is little, the spinning speed is high, the spinningis stable, the prepared protofilament has few defects, the density is not less than 1.180g/cm<3>, and the tensile strength is not less than 7cN/dtex. The protofilament can be prepared into a high-performance carbon fiber with tensile strength of more than 4.9GPa and elastic modulus of between 260 and 280GPa by high-temperature carbonization.
Owner:KINGFA SCI & TECH CO LTD +1

Method for preparing high-performance polyacrylonitrile-based carbon fiber protofilament through dry spraying and wet spinning

The invention relates to a method for preparing high-performance polyacrylonitrile-based carbon fiber protofilament through dry spraying and wet spinning, which comprises the following steps: preparing a polyacrylonitrile spinning stock solution; filtering and metering the polyacrylonitrile spinning stock solution after the demonomerization and deaeration; squeezing obtained materials through a spinning jet for forming fine spinning streams for entering a coagulating bath for coagulating forming through an air section; and carrying out drafting, water washing, drying densification, steam drafting and drying hot forming to obtain the high-performance polyacrylonitrile-based carbon fiber. The fiber firstly passes through a section of air layer, and then enters the coagulating bath for spinning forming by a wet method. The fine streams of the spinning solution is in a cylindrical shape after leaving spinneret orifices under the action of the gas-liquid interface tension, a primary cuticular layer is formed, and the cuticular structure is smooth. The method has the advantages of simple process, easy control and relatively low cost. In addition, the method also has the advantages that the spinning speed is high, the production efficiency can be improved, in addition, the surface of the obtained protofilament is smooth, the residual quantity of the solvents is greatly reduced, the quality homogenization degree of the protofilament is improved, and the mechanical property is excellent.
Owner:ZHONGFU SHENYING CARBON FIBER

Method for preparing polyimide fibers

The invention discloses a method for preparing polyimide fibers, and belongs to the technical field of the polyimide fibers. The method is characterized in that: polyamide acidic solution is subjected to spinning by adopting a wet spinning or dry wet spinning process, and fibers are subjected to processes of coagulating and drying or processes of washing, drying, heat treatment cyclizing and stretching continuously and are rolled finally to form the polyimide fibers. The method comprises the following specific steps of: reacting diamine with dianhydride in solvent under the protection of nitrogen to obtain polyamide acidic spinning solution; filtering the spinning solution, pouring the filtered spinning solution into a storage tank for defoaming, spinning according to the wet spinning or dry wet spinning process, pumping the spinning solution by a metering pump, and spraying from a spinneret plate; dragging by a silk guide roller, coagulating in coagulating bath, drying directly by a hot roller or a hot plate or drying by the hot roller or the hot plate after washing, and performing heat cyclizing and stretching by three sections or more than three sections of furnace sections; and finally, rolling silk. In the method, the integral process is continuous, smooth, compact and short in time, high imidization degree and degree of orientation are realized, and the high-performance fibers are obtained.
Owner:JIANGSU XIANNUO NEW MATERIAL TECH

Semi-continuous high-speed spinning machine

The invention relates to spinning equipment, in particular to a semi-continuous high-speed spinning machine. The semi-continuous high-speed spinning machine comprises a rack, a glue supply device, a strip forming device, a spinning device and a winding device, wherein a spinning roller of the spinning device is horizontally arranged relative to an operating surface of a spinning surface. The operating surface of the spinning surface is a horizontal working surface in a spinning surface area, and the fact that the spinning roller is horizontally arranged relative to the operating surface of the spinning surface refers to that the spinning roller is horizontally installed relative to spinning workers when the spinning workers face towards the winding device. According to the semi-continuous high-speed spinning machine, the spinning roller is horizontally arranged relative to the operating surface of the spinning surface, and two ends of the horizontally arranged spinning roller are fixed, so that the spinning speed can be increased on the basis of the semi-continuous high-speed spinning machine, the spinning roller is ensured to rotate stably without shaking, and the problems of intertwining and breakage of strips caused by shaking of the spinning roller during spinning are solved.
Owner:YIBIN HIEST FIBER +2

Method for preparing polybenzazole fiber

The invention relates to a method for preparing poly (p-phenylene) bis (benzoxazolyl) fibers, which belongs to the technical field of preparation of polymer materials. The method comprises the following steps: firstly, composite salt is prepared by diamino hydroxyphenol hydrochloride and a terephthalic acid, and phosphorus pentoxide, a polyphosphoric acid and an auxiliary agent are added into the composite salt, and subjected to prepolymerization under the condition of stirring and heating; secondly, a polymer reaction mixture after prepolymerization is over enters a screw extruder for further polymerization under the pressure of high-pressure inert gas or under the actuation of mechanical propulsion; thirdly, the polymer reaction mixture is extruded by the screw extruder, filtered, accurately measured, ejected, and solidified and formed in a solidification liquid after passing through a section of spinning shaft of inert gas; and fourthly, the polymer reaction mixture is subjected to five procedures of a diluted phosphoric acid aqueous solution, water, hot water, an alkaline solution and purified water for cleaning and removal of a phosphoric acid, and dried, rolled and formed. The method completely removes the phosphoric acid; the process is tempered; drying under the condition of exertion of a tensile force helps to close fiber holes; and the products produced have high strength and modulus.
Owner:BEIJING TEX STRONG NEW MATERIAL DEV +1

Method for preparing ultra-high molecular weight polyethylene fiber and fiber

The invention discloses a method for preparing an ultra-high molecular weight polyethylene fiber. According to the method, an ultra-high molecular weight polyethylene decahydronaphthalene solution is extruded through a spinneret plate to form a spinning trickle flow; the spinning trickle flow sequentially passes through a gas-phase section, a liquid-phase section, a physical extrusion section, a drying heat tank section and the like to obtain raw filaments; meanwhile, thin spinning filaments exiting from the liquid-phase section have stretching stress, and the raw filaments are subjected to high-power thermal stretching to obtain the ultra-high molecular weight polyethylene fiber of which the single-filament fineness is lower than 0.3dtex. The breaking strength of fiber bundle filaments is not lower than 40cN.dtex<-1>, and the modulus is not lower than 2,000cN.dtex<-1>. The method has the characteristics that the production energy consumption is reduced; the energy is saved, the emission amount is reduced, and the production cost is low. The prepared ultra-high molecular weight polyethylene fiber has excellent quality and is used for preparing public safety protection articles, labor safety products and medical materials such as bulletproof and stab-resistant clothes, explosion-proof blankets, explosion-proof tanks, anti-puncturing shoes, anti-puncturing shoe soles and operation suture lines.
Owner:CHINESE TEXTILE ACAD

High-strength and high-modulus polyvinyl alcohol fiber and melt spinning method of high-strength and high-modulus polyvinyl alcohol fiber

The invention relates to a high-strength and high-modulus polyvinyl alcohol fiber and a melt spinning method of the high-strength and high-modulus polyvinyl alcohol fiber. The method comprises the following steps that polyvinyl alcohol, water and polyatomic alcohol are subjected to full swelling after being uniformly mixed; the polyvinyl alcohol subjected to the full swelling is added into a double-screw-rod extruding machine and is then subjected to full fusion to be extruded, and melt fine flows form a primary fiber after air blowing cooling; and the prepared primary fiber is subjected to the drying by a hot air drying oven, multistage stretching and tense heat setting to form the polyvinyl alcohol fiber. The preparation method of the prepared polyvinyl alcohol fiber has the advantage that through the hydrogen bond compounding among water molecules, polyatomic alcohol and polyvinyl alcohol molecules, the melt spinning and the high-power stretching of the polyvinyl alcohol are realized. The polyvinyl alcohol fiber prepared by the preparation method has the advantages of fiber degree controllability, high strength and high modulus, and can be widely applied to the field of civil engineering concrete.
Owner:SHANGHAI LUOYANG NEW MATERIAL TECH

Preparation method of polyacrylonitrile-based carbon fiber precursor

The invention relates to a preparation method of a polyacrylonitrile-based carbon fiber precursor, and mainly aims at solving the problems that a carbon fiber spinning solution prepared from azobisisoheptonitrile as an initiator in the prior art is over-large in viscosity, and poor in spinnability, and the carbon fiber precursor obtained by spinning is low in strength and unstable in property. Through the technical scheme, the preparation method of the polyacrylonitrile-based carbon fiber precursor comprises the following steps: by taking azobisisoheptonitrile as an initiator, polymerizing a first monomer acrylonitrile and a second monomer itaconic acid through initation of a solvent dimethyl sulfoxide to obtain the spinning solution; carrying out vacuum removal on residual monomer and bubbles from the spinning solution; filtering to obtain a high-property polyacrylonitrile copolymer spinning solution; and carrying out solidifying, drafting, washing, oiling, compacting by drying, steam drafting and steam heat setting on the spinning solution, and then rolling to obtain the carbon fiber precursor with high compactness and high strength, the problems are relatively well solved, and the method can be applied to industrial production of the carbon fiber precursor.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for producing Lyocell fibre for tire cord

The invention relates to a preparation method of the Lyocell fiber for the tyre fabric cord in chemical fiber production. The cellulose alpha pulp and the NMMO water solution are added into a dissolver according to a certain proportion, and a certain amount of inorganic salt is added to form cellulose pulp / NMMO / inorganic salt mixture, the mixture is statically soaked and stirred into pulp shape, spinning raw solution is formed through warm-up stirring and reduced pressure distillation, and the as-formed fiber is frozen through dry-wet spinning, after lixiviation, moderate stretching, heat setting, and oiling, the fiber is winded into rollers. The utility model has the advantages that the cellulose alpha pulp with moderate polymerization degree is adopted as the raw material, and the concentration of the cellulose of the invention is as high as 19.8 percent; the production efficiency is high; simultaneously, the inorganic salt for increasing the apparent molecular weight of the cellulose added into the system is adopted, and moderate stretching and heat setting is performed to the as-formed fiber, the manufactured Lyocell fiber has good mechanical properties such as high intensity, high modulus, good dimensional stability, and good heat durability, and the fiber can be as applied to the fiber of high quality tyre fabric cord used in high grade passenger vehicle field.
Owner:浙江龙赛尔纤维科技有限公司
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