62results about How to "Simple spinning process" patented technology

The invention relates to a method for preparing a bletilla striata hemostatic gauze and belongs to the technical field of textile engineering. The preparation method provided by the invention employs the manner of carrying out the process of soaking bletilla striata stem blocks in distilled water a plurality of times, filtering and collecting the filtrate, and further comprises the following steps of: concentrating the collected filtrate, adding absolute ethyl alcohol to the concentrated bletilla striata gum solution, thoroughly standing and performing alcohol precipitation, thereby obtaining white precipitate; washing the white precipitate using absolute ethyl alcohol, and drying the precipitate for future use; preparing the dried bletilla striata gum into a spinning solution with water as a solvent and spinning the solution into long filaments with the absolute ethyl alcohol as a coagulating bath; knitting the long filaments into the gauze through needle weaving, machine weaving or non-weaving; and then cutting, disinfecting and packing the gauze, thereby obtaining the water-soluble hemostatic gauze. The raw material employed by the preparation method provided by the invention is the bletilla striata gum extracted from the bletilla striata stem blocks; the bletilla striata gum has excellent water-solubility; the bletilla striata long filaments can be degraded and absorbed in body and is good in compatibility with the organism without side effect on the wound. Chemicals involved with the preparation of the bletilla striata hemostatic gauze is only the absolute ethyl alcohol which can not generate harmful substances and has no pollution on the environment; and the coagulating bath for spinning by the wet method and the spinning process are simple and low in cost.

The invention discloses a PEDOT:PSS fiber and a preparation method thereof. A wet spinning technology is adopted, low toxicity and low harm, green and environment-friendly mixed solution of inorganic salt, ethanol and water is adopted as coagulation bath, a PEDOT:PSS aqueous solution is taken as the main raw material, through a simple chemical treatment method, the PEDOT:PSS fiber with excellent electrical conductivity and mechanical properties can be prepared. The PEDOT:PSS fiber can be used directly as a lightweight flexible lead, also can be used for the electrode of a linear flexible capacitor, and can exhibit rapid voltage change response and high specific capacity. Compared with the prior art, the method provided by the invention has the prominent advantages of safety, green and environmental protection, and the fiber has large strength and good flexibility. At the same time, the equipment and method are simple, and can achieve large-scale production of PEDOT:PSS fiber with good mechanical properties, high electrical conductivity and good electrochemical properties.

The invention provides a whole new weaving process of carbon fiber electromagnetism shielding fabric, and a method thereof. Regenerated cellulose fiber or polyacrylonitrile fiber yarn is used for weaving to barrier fabric, graphite fiber yarn mesh is obtained by heating in high temperature to be served as basic cloth, and filature is sprayed by using a dry method to form the carbon fiber electromagnetism shielding fabric which has the function of well shielding the electromagnetic wave and has the advantages of simple spinning process and high production efficiency, thereby improving the production value of the product.

The invention relates to caprolactam hydrolyzed polymer fibres and a spinning method thereof. The spinning method comprises the following steps: preparing a polyamide 6 prepolymer at low temperature, pre-controlling the content of oligomers in a melt, carrying out auxiliary end-blocking by binary acid to reduce the content of end amino groups in a system, then carrying out end-blocking by ethylene glycol, after that, carrying out chain growth by means of gylcol ester removal exchange, wherein in the obtained product, the content of extractable matters is not greater than 2wt%, and the content of cyclic dimers is not greater than 0.3wt%; then, carrying out direct melt-spinning formation after the condensation polymerization reaction is concluded. The spinning method disclosed by the invention is simple in process, and capable of reducing energy consumption while increasing the utilization rate of caprolactam; the obtained melt is capable of being used for direct melt-spinning, easy in realizing high-capacity large-scale production, and capable of being applied to the fields of garment fibres, industrial silk, engineering plastics and the like.

The invention relates to a method for preparing tows for blended modified polylactic acid cigarettes. Fiber grade polypropylene particles, functional master batches and polylactic acid particles are uniformly mixed according to a certain ratio, and the tows for polylactic acid cigarettes are prepared through the working procedures of spinning, oiling, drafting, wrapping and drying. The method has a simple process and high speed to form, the produced product can reduce the specific weight of polylactic acid fiber, the operational performance is increased, the surface area of the fiber is increased, grain phase particles in smoke can be effectively absorbed, and a good filtering effect is generated.

The present invention relates to the field of nylon materials, and discloses a melting direct-spinning method of copolymerized modified low-melting-point nylon fibers. The method comprises the steps of 1) material preparation, wherein caprolactam, a copolymerized modified component, an end-capping agent, water and a catalyst are heated and mixed; 2) ring opening, wherein a mixture is heated for ring opening; 3) pre-polycondensation, wherein a pre-polymerization reaction and devolatilization are performed; 4) final polycondensation, wherein a final polycondensation reaction and devolatilizationare performed; 5) devolatilization before spinning; and 6) spinning, wherein a product is directly conveyed to spinning threads for spinning to obtain the copolymerized modified low-melting-point nylon fibers. According to the method, the copolymerized modified component is added for destroying the regularity of nylon molecular chains and reducing the hydrogen bond density and crystallinity of the nylon molecular chains, thereby achieving the purpose of lowering the melting point of nylon; and according to different varieties and content of added copolymerized components, the melting point ofthe nylon can be controlled to be 90-200 DEG C, so that the application range of the low-melting-point nylon is greatly expanded.

The invention relates to a novel weaving method of a carbon fiber electromagnetic shielding textile fabric, which is characterized by comprising the following steps of: utilizing regenerated cellulose fiber or polyacrylonitrile filament yarn to weave a barrier fabric; heating at the speed of 10 DEG C/min of an electrothermal furnace to 280 DEG C, and then carrying out pre-oxidization; carrying out heat preservation for 2 hours; heating at the speed of 15 DEG C/min of the electrothermal furnace to 1,000 DEG C under inert gas protection; carrying out heat preservation for 3 hours; obtaining a carbon fiber yarn mesh with 90 percent of carbon content; heating to 2,000-3,000 DEG C; obtaining a graphite fiber yarn net with more than 99 percent of carbon content; and by taking the net as a base fabric, utilizing a dry method to inject and spin so as to make various non-woven fabrics or wall shielding materials. According to the method, harm of electromagnetic wave to a human body can be shielded well, the spinning process is simple, the production efficiency is high, and better economic and social benefits can be achieved.

The invention relates to a method for improving pre-oxidation speed of polyacrylonitrile fiber through physical blending. The method comprises the following steps: performing vacuum drying on polyacrylonitrile, lignin and a plasticizer, and uniformly stirring and mixing, thus obtaining a mixed material; spinning, setting and winding to obtain a melt spun fiber, wherein a mass ratio of polyacrylonitrile to lignin to the plasticizer is (5-30):(10-30):(50-70); and performing water bath drawing on the melt spun fiber, and performing pre-oxidation to obtain the pre-oxidation polyacrylonitrile fiber. The raw material lignin is low in cost and slight in environmental pollution and is suitable for industrial production; lignin contains lots of hydroxyl groups which can achieve hydrogen-bond interaction with a polar group cyano on a polyacrylonitrile molecular chain, and lignin and polyacrylonitrile have high compatibility; moreover, the oxygen content in the lignin structure is high, the oxygen can be released in the pre-oxidation process, a uniform oxygen source is provided for an oxidation reaction of a polyacrylonitrile precursor, and a prepared pre-oxidation thread sheath-core is small in difference and dense and uniform in structure.

The invention discloses a composite shape memory fiber with a thermosetting/thermoplastic core-shell structure and a preparation method of the composite shape memory fiber. According to the composite shape memory fiber, thermosetting epoxy resin serves as a core layer, and a thermoplastic polycaprolactone serves as a shell layer. The method comprises the following steps: dissolving polycaprolactone and an initiator in a solvent as a shell-layer spinning solution; dissolving epoxy resin E51 and a curing catalyst in a solution as a core-layer spinning solution; preparing the composite shape memory fiber by using a coaxial electrostatic spinning method. The composite shape memory fiber is excellent in shape memory performance, and a quick shape recovery process can be realized within 5-7s; meanwhile, the composite shape memory fiber has a stable network structure and a simple spinning process, and is low in cost; a membrane material with a composite fiber structure is easily prepared.

The invention discloses a gravity-following cylindrical electrostatic spinning device and method. The device comprises a cylindrical spray head, a cylindrical liquid supply device with a notch is arranged in the cylindrical spray head and connected with a solution propeller at the outer side of the cylindrical spray head through a hose, and a shell of the cylindrical spray head is connected with ahigh voltage generator. The spinning method comprises the steps that the solution propeller is turned on, a solution is injected into the cylindrical liquid supply device through the hose, and when the liquid surface of the solution exceeds the notch of the cylindrical liquid supply device and the solution overflows, the portion between the cylindrical spray head and the cylindrical liquid supplydevice is filled with the spinning solution; the high voltage generator is turned on and applies positive voltage to the cylindrical spray head, and jet flows are formed on the spinning surface and quick move towards a metal rolling cylinder under the effect of electric field force; along with volatilization of a solvent, the jet flows are deposited on the surface of the metal rolling cylinder atlast. According to the gravity-following cylindrical electrostatic spinning device, the overflow-type liquid supply device controls the solution, electric charge accumulation is generated in the edgeof a gap in the cylindrical surface, and accordingly electrostatic spinning in the gravity-following direction is achieved.

The invention provides tussah silk blended yarn. The tussah silk blended yarn comprises, by weight, 20% to 30% of mulberry silk, 20% to 30% of modal long fibers and 40% to 50% of tussah silk. The invention further provides a spinning process of the tussah silk blended yarn. The spinning process comprises the steps of blow carding, drawing, roving, spinning and spooling. A compact siro spinning mode is adopted, the advantages of siro spinning and compact spinning are combined in compact siro spinning, the evenness CV value and nub and snick indexes are very good, the single thread strength is high, the structure is compact, wear resistance is good, less hair is generated, the amount of harmful hair of 3 mm or above is extremely small, the yarn is smooth and clean, and the fabric quality ishigh. The yarn made through the process can be used for making common underwear, bath towels and other comfortable, soft and high-moisture absorption textile raw materials next to the skin.

The invention relates to the field of polyamide fibers, and discloses a manufacturing method of polyamide 56 industrial yarn for airbags. The manufacturing method comprises the steps of a salifying stage, a polymerizing stage, a spinning stage, a drafting stage and the like. According to the manufacturing method, a nucleating agent is added, and therefore the grain size of polyamide 56 can be reduced; orientation and crystallization are conducted in sequence through the saturated water vapor bath drafting working procedure, the hot roller drafting working procedure and the like, the grain sizeof the polyamide 56 is controlled through a heat setting technology, polyamide 56 fibers with the high orientation and the low grain size are obtained, and therefore the polyamide 56 industrial yarnwith the high strength and the low modulus is finally obtained. The obtained product can be widely applied to the field of airbags, and the storage performance and the flexibility of the airbags can be improved.

The invention relates to a wet spinning method of PEDOT:PSS conductive fiber high in elongation in an organic polymer conductive fiber preparation technology. The method includes the following steps that firstly, PEDOT:PSS spinning fluid is prepared; then, the spinning fluid enters an ethyl alcohol and water mixed coagulating bath through a wet spinning spinneret plate to be subjected to coagulation forming, wherein LiCl is added in the ethyl alcohol and water mixed coagulating bath, and the addition concentration is 0.1-0.5 mol/L; and fiber obtained after coagulation forming is dried and cooled after being subjected to drafting, and the PEDOT:PSS conductive fiber high in conductivity and elongation is prepared. According to the method, one-step method wet spinning is adopted, the water/ ethyl alcohol system coagulating bath is adopted as the main body, lithium ions are added in the coagulating bath to assist in fiber solidification forming, the lithium ions are doped in the fiber, andtherefore the fiber tensile elongation and conductivity are obviously improved, the application range of the fiber in textile materials is widened, and processing adaptability of the fiber is improved.

The invention relates to the technical field of manufacturing artificial filaments and analogues through polyvinyl chloride resin, in particular to a method for producing polyvinyl chloride fibers for artificial hair through ultrahigh pressure spinning, wherein the ultrahigh pressure spinning is adopted to convert cohesive energy of melts into system friction heat; material in a system is prompted to be heated uniformly; the utilization of heat resistant chlorinated vinyl chloride resin and heat stabilizers is reduced at the same time; the spinning fluidity is improved; the method chooses and utilizes the ultrahigh pressure melt spinning technology to prepare the polyvinyl chloride fibers, and the spinning pressure can reach 800 to 1000 kg/cm<2>; the application of the ultrahigh pressure spinning technology can improve the situations that the viscosity of vinyl chloride series resin is high and the fluidity is not good to a great extent; meanwhile, additives such as compatible chlorinated vinyl chloride resin matrix heat resistant chlorinated vinyl chloride resin can be omitted; in addition, the method enables the spinning process to be simplified and can improve the efficiency, and finished products have excellent performances.

An embodiment of the invention discloses a spinning process of a combed cotton yarn. The process comprises the steps of material selection, wherein the following raw materials in percentage by mass are selected: 20-30% of long stapled cotton, 20-30% of sea island cotton and 40-50% of Egyptian cotton; cotton cleaning; cotton carding, wherein combed noil fiber rolls are treated with a cotton cardingmachine to obtain cotton fiber slivers; drawing, wherein drawing is performed for three times; and spinning, wherein a full-automatic rotor spinning machine is adopted, the cotton slivers obtained bythe drawing process are fed into the rotor spinning machine, and air spinning is performed to obtain a cotton yarn product. An adopted spinning mode is compact siro spinning, the compact siro spinning combines the advantages of siro spinning and compact spinning, the spinning process is simple, the occupied area of a machine is small, the production cost is reduced on the basis of ensuring the product quality, and a theoretical basis is provided for development and research of preparation of an environment-friendly ordinary blended yarn. Furthermore, the rolling step in the cotton cleaning step can be reduced, so that the use of one machine is reduced and the cost is reduced.

The invention discloses a blended yarn of wool and ramie and a manufacturing method thereof. The manufacturing method uses the following raw materials for the blended yarn in the following weight ratio: 30 - 70% of wool fiber with the main length between 70 and 80 mm, and 70 - 30% of ramie fiber with the main length between 120 and 130 mm. The manufacturing method adopts a process flow as follows: cutting the ramie fiber to the main length of the wool fiber, adding wool lubricating oil to the wool fiber and finishing the wool fiber, then blending the ramie fiber and the wool fiber, and obtaining the blended yarn of wool and ramie through processing steps of loosening, carding, joining, roving, spinning, twisting and winding. The wool lubricating oil accounts for 0.8 to 1% of the weight of the raw materials. The wool lubricating oil is sprayed on each layer of wool fiber. After the finishing, the fiber is covered for standing for 24 to 36 hours. A wool type roller carder is used for carding. A roving frame and a spinning frame are both wool type spinning devices. The rotation speed of a cylinder of the carder is between 580 and 620 r/min; the rotation speed of a flyer of the roving frame is between 350 and 450 r/min; the doffing speed of the flyer is between 250 and 350 r/min; and the flyer speed of the spinning frame is between 10500 and 11500 r/min. Through blending of the wool fiber and the ramie fiber, the blended yarn with good performance is obtained.

The invention discloses a dust collecting bag. The dust collecting bag is formed by weaving of modified graphene fibers which are prepared through the following steps: (1) sufficiently dissolving modified graphene and polyamide according to the weight percent ratio of x to y or dispersing modified graphene and polyamide into a solvent to form a spinning solution, and adding polyvinylpyrrolidone (PVP) with the solute mass being 0.1-10% so as to adjust the viscosity of the spinning solution, wherein x is more than or equal to 1% and smaller than or equal to 20%, and x+y is equal to 1; and (2) carrying out electrostatic spinning on the prepared spinning solution, and controlling the spinning voltage to be 7-18KV, receiving distance to be 5-60cm, and extrusion speed to be 0.01-1ml/min in the spinning process, thus preparing the fiber materials. The woven dust collecting bag has the characteristics of high temperature resistance, light weight, high strength, incapability of water absorption, and surface smoothness on the premise of ensuring the same filter efficiency; blockage possibility caused by water absorption of the bag can be effectively reduced, the use efficiency of the bag can be improved, the use service life of the bag can be prolonged, and the replacement and cleaning frequency can be reduced.

The invention discloses a device and a method for ring-shaped electrostatic spinning in the gravity direction. The device comprises ring-shaped nozzles and ring-shaped liquid supply devices, wherein the ring-shaped liquid supply devices are arranged in hollow structures in the ring-shaped nozzles and connected with a solution propeller outside the ring-shaped nozzles through a hose, and the ring-shaped nozzles are connected with a high-voltage generator; notches are formed in the upper parts of the ring-shaped liquid supply devices. The spinning method comprises steps as follows: a solution isinjected into the ring-shaped liquid supply devices, and the solution continuously flows into the hollow structures of the ring-shaped nozzles when overflowing; the high-voltage generator applies positive voltage to the ring-shaped nozzles, when the voltage exceeds a critical threshold, multiple jet flows are formed at jet tips below the ring-shaped nozzles, and the jet flows move to a roller under the action of electric field force and are finally deposited on the surface of the roller with volatilization of a solvent. According to the device and the method, the solution is controlled by theoverflowing type liquid supply devices, charges are accumulated on gap edges below rings, and accordingly, electrostatic spinning in the gravity direction is realized.