1283 results about "Fiber spinning" patented technology

The present invention relates to a medical device, and more particularly to a method of forming a tubular membrane on a radially expandable structural frame. In one aspect, a structural frame is placed over a spinning mandrel and a fiber is electro-statically spun over at least a portion of the structural frame forming a membrane. A transfer sheath may be used between the mandrel and structural frame to prevent the electrostatically spun fiber from adhering to the mandrel. In another aspect, a first membrane is spun over the mandrel before the structural frame is placed over the mandrel. In this aspect, at least a portion of the structural frame is sandwiched between the membranes. The membrane or membranes and structural frame form a fiber spun frame assembly. The fiber spun frame assembly may be coated with an elastic polymer. In addition, the membrane or membranes may go through some post processing to achieve desired characteristics or configurations.

A method for forming biodegradable fibers is provided. The method includes blending polylactic acid with a polyepoxide modifier to form a thermoplastic composition, extruding the thermoplastic composition through a die, and thereafter passing the extruded composition through a die to form a fiber. Without intending to be limited by theory, it is believed that the polyepoxide modifier reacts with the polylactic acid and results in branching of its polymer backbone, thereby improving its melt strength and stability during fiber spinning without significantly reducing glass transition temperature. The reaction-induced branching can also increase molecular weight, which may lead to improved fiber ductility and the ability to better dissipate energy when subjected to an elongation force. To minimize premature reaction, the polylactic acid and polyepoxide modifier are first blended together at a relatively low temperature(s). Nevertheless, a relatively high shear rate may be employed during blending to induce chain scission of the polylactic acid backbone, thereby making more hydroxyl and/or carboxyl groups available for subsequent reaction with the polyepoxide modifier. Once blended, the temperature(s) employed during extrusion of the blended composition can be selected to both melt the composition and initiate a reaction of the polyepoxide modifier with hydroxyl and/or carboxyl groups of the polylactic acid. Through selective control over this method, the present inventors have discovered that the resulting fibers may exhibit good mechanical properties, both during and after melt spinning.

An array of long carbon nanotubes (i.e. an array where the average length of the nanotubes is greater than 0.5 millimeters) is prepared by exposing a supported catalyst at elevated temperature to a gas mixture of hydrocarbon, inert gas, and a relatively low percentage of hydrogen. Addition of water vapor to the gas mixture may result in an increase in the length of the nanotubes, an increase the rate of growth, and a decrease in contamination of the array by amorphous carbon. The temperature and growth time are also chosen to minimize the amount of amorphous carbon that forms on the array. Fibers spun from the array have a higher tensile strength compared to known CNT fibers.

Fiber spinning of two polymer compositions wherein one of the compositions contains carbon nanotubes produces structures such as fibers, ribbons, yarns and films of carbon nanotubes. The polymers are removed and stabilization of the carbon nanotube material is achieved by post-spinning processes. The advances disclosed herein enable the carbon nanotube composites to be used in actuators, supercapacitors, friction materials and in devices for electrical energy harvesting.

The present invention relates to a medical device and method of forming the medical device. In particular, the present invention relates to a medical device having a tubular membrane structure over a radially expandable structural frame, and to a method of forming the tubular membrane on the radially expandable structural frame. In one aspect, a structural frame is placed over a spinning mandrel and a fiber is electro-statically spun over at least a portion of the structural frame forming a membrane. A transfer sheath may be used between the mandrel and structural frame to prevent the electro-statically spun fiber from adhering to the mandrel. In another aspect, a first membrane is spun over the mandrel before the structural frame is placed over the mandrel. In this aspect, at least a portion of the structural frame is sandwiched between the membranes. The membrane or membranes and structural frame form a fiber spun frame assembly. The fiber spun frame assembly may be coated with an elastic polymer. In addition, the membrane or membranes may go through some post processing to achieve desired characteristics or configurations.

The invention discloses a jet yarn spinning device for an electrostatic spun nano fiber, which includes a collecting device, wherein two thread jetting devices are arranged on the two sides of the collecting device and connected with a high-voltage electrostatic generator; a buncher is arranged below the collecting device; the two thread jetting devices are arranged between the collecting device and the buncher and symmetrically and oppositely arranged along the axis; a jet nozzle twister is arranged below the buncher; a delivery roller is arranged below the jet nozzle twister; a winding mechanism is arranged below the delivery roller; and the collecting device, the buncher, the jet nozzle twister and the delivery roller are arranged along the same axis from top to bottom. The electrostatic spun nano fiber spinning device integrates thread jetting, collecting, drawing, twisting and winding, and can continuously prepare the electrostatic spun nano fiber yarns. The nano fiber spinning method has simple process, high yarn yield, is suitable for multiple polymer yarn solutions, and realizes the continuous and scaled preparation of the nano fiber yarns.

A preparation of composite hollow fiber membrane adopts solution phase transfer hollow fiber spinning process, makes poly(ethylene terephthalate) or polysulfone, solvent and pore-forming agent into a base membrane spinning solution of composite hollow fiber membrane, makes polyvinylidene fluoride or other copolymers or mixture of same, solvent and pore-forming agent into composite layer spinning solution of composite hollow fiber membrane and simultaneously extrudes the said two spinning solution and core solution in the hole of the spinneret central pipe through the spinneret for outside condensation bath. The solvents and pore-forming agents in the two kinds of spinning solutions prepared in said step (1) and (2) enters condensation solution phase and the polymers, as the composite layer and the base membrane materials, precipitates into polymer hollow fiber membrane due to phase transfer, producing high-strength and high-flux hydrophilic composite hollow fiber membrane.

A fiber spinning apparatus for charging a polymer-containing liquid stream, having at least one electrically charged, point-electrode positioned adjacent the intended path of said liquid stream and creating an ion flow by corona discharge to impart electrical charge to the polymer-containing liquid stream.

The invention relates to a method for preparing polyester fibers with pearly luster. The method comprises the following steps: (1) pearlescent pigment agglomerate and full-dull PET fiber forming resin slice are blended according to the weight ratio of 5-20 to 80-95; and after drying, the water content is less than 100PPM, and the slice is delivered to a feeding port of an extruder and enters an screw extruder for heat fusing and compression; (2) the temperature is controlled to between 290 and 305 DEG C, fusant extruded out by the rotary screw rod enters a metering pump through a distributing pipe and a static mixer, delivered to a spinning component, filtered by a sea sand layer and pressed into a spinning plate to form fusant current which is cooed to form in a spinning cabinet, and the surface of a filament bundle is covered by a spinning finish; and 3. the spinning speed pre-extension is between 2, 500 and 3, 500m/min, the winding carry rate is between 5 and 15 percent for wind-forming, and the full-dull pearlescent polyester fiber POY is obtained. The manufacturing process is easily realized, and is convenient to improve the pearlescent fiber spinning effect and simultaneously provides the fibers with light extinction performance, and the pearlescent pigment has excellent performance and little feed rate.

The invention discloses a traditional Chinese drug component containing functional viscose fiber and its manufacturing method. It is made up of traditional Chinese drug material, semi-finished products, finished products, part of dregs of decoction, and viscose fiber. Its components content is fiber: 85-99.9%, traditional Chinese drug: 0.1-15%. Its manufacturing method includes the following steps: dipping, mellowing, sulphidizing, dissolving, mixing, filtering, defoaming, ripening, spinning fore raw liquor mixing, traditional Chinese drug fiber spinning and drafting, and fiber after-treatment. Its traditional Chinese drug content can reach 10%. Thus the fiber has more effective health protection, sickness prevention, and auxiliary therapy. Thus it is fit for making underclothes, bedding, medical component, and so on.

The invention discloses a filtering material for a mask and a method for manufacturing the filtering material. The filtering material for the mask comprises polymeric nano-fibers and a supporting non-woven fabric. The method for manufacturing the filtering material includes spinning homogenous polymeric nano-fiber spinning solution or fusant on the supporting non-woven fabric by solution or fusion electrostatic spinning. The filtering material for the mask is excellent in breathability, and rejection to sodium chloride aerosol particles with the sizes of 0.3 micrometer can be higher than 90%. Besides, the method for manufacturing the filtering material for the mask is simple, cost is low, and the filtering material and the method are applicable to industrial production.

A manufacturing method by which alumina-silica based fibers excellent in mechanical strength can be readily and securely obtained. The method obtains precursor fibers as a material by using an alumina-silica based fiber spinning stock solution for use in an inorganic salt method. Next, the precursor fibers are heated under an environment which makes it difficult to carry out an oxidizing reaction on the carbon component contained in the precursor fibers. Thus, the precursor fibers are sintered to obtain alumina-silica based fibers.

The invention discloses a feather protein fiber and a method for preparing the same. The feather protein fiber comprises the following components: 5-40 parts by weight of feather protein and 60-95 parts by weight of chemical fiber. The method for preparing the feather protein fiber comprises the following steps: A, feather protein spinning solution preparing: dissolving feather in an alkaline aqueous solution comprising sodium silicate and potassium silicate with the total mass concentration of 20-35%, and filtering to obtain the feather protein spinning solution, wherein the mass ratio of the sodium silicate to the potassium silicate is 1:(0.5-1); B, blending the feather protein spinning solution and the chemical fiber spinning solution, and spinning; and C, subjecting the feather protein fiber trickle to coagulation-bath treatment, pickling, washing and drying to obtain the feather protein fiber. The method for preparing the feather protein fiber can effectively ensure that the feather protein and the chemical fiber are fully and uniformly blended to achieve the purpose of spinning.

The invention discloses a urethane elastic fiber with high temperature resistance and high elasticity and a preparation method thereof, the materials of the urethane elastic fiber comprise: polyether diols, diisocyanate, butanol, amine admixture, anti-oxidant, reelability agent, ultraviolet absorber, yellowing resistant agent and dimethyl acetamide; the preparation method of the urethane elastic fiber is that: a prepolymer is obtained through prepolymerization reation, and macromolecule polymer is also obtained through continuous chain extension reactions, then spinning solution is formed by adding different auxiliary agents; finally winding and dry spinning through round spinning channel are performed to obtain a high temperature high elastic urethane fiber spinning can which has the advantages of high temperature resistance, high elasticity, excellent reelability, outstanding yarn evenness, etc, and the preparation method can realize the continuous process of chain extension reactions and addition of auxiliary agents with continuous and stable production process and high product evenness and can completely meet the requirements of all kinds of novel fabrics and high grade fabrics.

A polyamide and polyester sheath-core functional fiber and manufacturing method are provided. Section of the polyamide and polyester sheath-core functional fiber is an abnormal sheath-core compound structure. Common PET (terylene) polyester forms abnormal sheath-core of fiber and functional PA (polyamide) with negative oxygen ion and far infrared ray forms abnormal sheath layer of fiber. The manufacturing method is as follows: using a complex fiber-spinning machine, using an abnormal central orifice of same plate bi-component sheath-core distributing plate and corresponding an abnormal spinneret orifice of spinneret plate as complex fiber-spinning assembly; material quality proportion of two components sheath and core is 1.5:8.5 to 5:5. Fiber abnormal sheath layer PA uses melt spinning temperature which is 3 to 10 DEG. C higher than conventional spinning temperature so that melt viscosity is reduced, which leads to high compatibility penetrating each other in larger area edge between the PET melt and the PA. It is hard to peel off two components of polyamide and polyester. The filament has larger specific surface and is easy to release negative oxygen ions constantly and effectively above 5500/cu.cm. Far infrared transmissivity is above 0.86. The invention is iron hand in the velvet glove and wearable. The fiber product is multifunctional, high in quality, which satisfies subsequent manufacturing demand greatly and improves quality of final product and is simple in manufacturing process, low in cost with good effects.

The invention discloses an animal protein fiber and preparing method. The animal protein fiber is a copolymer of animal protein and C-C double-bonded monomer, the molecular weight 10,000-300,000, the content of the animal protein accounts for 10-75% of the total animal protein fiber, and the animal protein is single keratin or the mixture of the keratin with casein or collagen. The preparing method includes synthesis of spinning seriflux, after-treatment of the spinning seriflux, wet-process spinning, fiber solidification and fiber spinning stretch oiling compacted forming treatment. The animal protein fiber is a low cost high quality fiber with the animal protein as resource. The animal protein fiber: fineness is 1.0-3dtex, tensile strength is 0.8-3.5CN/dtex, and breaking extension is 15-45%.

The invention disclose a manufacturing method of stainable alginate fibers, which comprises the following steps of: adding a water-soluble dendrimers compound into a alginate fiber spinning solution, and solidifying, drafting, water washing and post-processing by adopting wet spinning equipment and technology to obtain the alginate fibers with excellent staining property, wherein the content of dendrimers in the alginate fibers is 1-10 percent. Compared with a traditional alginate fiber production technology, the invention has the advantages that the prepared alginate fibers can be applied to direct dyes and active dyes under a salt-free condition to realize staining and have higher dye uptake rate which generally reaches above 80 percent and is 10-15 times that of the alginate fibers produced by the traditional technology. In addition, the alginate fibers prepared by the invention has better color fastness and particularly excellent wet-processing fastness which reaches above grade 4.

The invention discloses a method for coloring alginate fiber stoste by adopting lake colors, and belongs to the field of fine chemical engineering and material science. The method comprises the following steps: adding sodium alginate into deionized water, and stirring so as to dissolve sodium alginate fully to prepare alginate fiber spinning stoste; then adding lake colors into the alginate fiber spinning stoste, stirring and mixing uniformly, filtering and defoaming to obtain the lake color colored alginate fiber stoste, and preparing further to obtain lake color colored alginate fibers. The method overcomes the problem of damage of traditional dye dying on fibers; the prepared colored alginate fibers have the advantages of bright colors, high color fastness, good solvent mobility resistance and the like.

Discloses are a conjugate electrospinning devices for preparing fibers (nanofibers) having a nano-level thickness, and nanofibers prepared using the same. The conjugate electrospinning devices comprises: spinning dope main tanks (1); metering pumps (2); a nozzle block (4); nozzles (5) aligned on the nozzle block; a collector (7) for collecting fibers spun from the nozzle block; and a voltage generator (9) for applying a voltage to the nozzle block and the collector (7), wherein [I] nozzles for spinning two or more different kinds of spinning dope are aligned on a nozzle block (4) regularly or in random order in repetitive units at the same ratio or in different ratios, aligned in random order at a predetermined ratio, or aligned thereon in random order at a predetermined ratio, or aligned thereon repetitively; [II] the number of the spinning dope main tanks (1) is two or more; and [III] a spinning dope drop device (3) is arranged between the spinning dope main tanks (1) and the nozzle block (4). Since two or more different kinds of spinning dopes are combined and electrospun, and thus the physical properties (features) of a non-woven fabric and a filament can be easily managed by a simple process. Nanofibers and their non-woven fabrics can be mass produced because the fiber formation effects are maximized.

Main chain thermotropic liquid crystal esters, ester-imides, and ester-amides were prepared from AA, BB, and AB type monomeric materials and were end-capped with phenylacetylene, phenylmaleimide, or nadimide reactive end-groups. The resulting reactive end-capped liquid crystal oligomers exhibit a variety of improved and preferred physical properties. The end-capped liquid crystal oligomers are thermotropic and have, preferably, molecular weights in the range of approximately 1000-15,000 grams per mole. The end-capped liquid crystal oligomers have broad liquid crystalline melting ranges and exhibit high melt stability and very low melt viscosities at accessible temperatures. The end-capped liquid crystal oligomers are stable for up to an hour in the melt phase. These properties make the end-capped liquid crystal oligomers highly processable by a variety of melt process shape forming and blending techniques including film extrusion, fiber spinning, reactive injection molding (RIM), resin transfer molding (RTM), resin film injection (RFI), powder molding, pultrusion, injection molding, blow molding, plasma spraying and thermo-forming. Once processed and shaped, the end-capped liquid crystal oligomers were heated to further polymerize and form liquid crystalline thermosets (LCT). The fully cured products are rubbers above their glass transition temperatures. The resulting thermosets display many properties that are superior to their non-end-capped high molecular weight analogs.