768results about "Dry spinning methods" patented technology

A vascular prosthesis comprising a first layer having a predetermined first porosity and a second layer having a predetermined second porosity, wherein the first layer and the second layer are each made of first and second electrospun polymer fibers.

Disclosed herein is a method for manufacturing a composite fiber filter having high efficiency and high functionality, the method comprising: melt-spinning microfiber yarns on a forming rod, which is made of a conductive material, grounded at one end thereof and rotatably driven, using a melt-spinning device, to form on the forming layer a microfiber layer consisting of the microfiber yarns; and electrospinning on the microfiber layer an electrospinnable polymer solution having a given dielectric constant, using an electrospinning device, so as to form on the microfiber layer a nanofiber layers consisting of nanofiber yarns, wherein the microfiber yarns of the microfiber layer and the nanofiber yarns of the nanofiber layer contain silver nanoparticles so as to have an antibacterial function.

A robust process for the continuous preparation of solutions of high molecular weight UHMW PO that is capable of producing strong materials at high production capacity, is conservative of capital and energy requirements, and the articles made therefrom.

The invention relates to a process for forming fibers from a spinning solution utilizing a high speed rotary sprayer. The fibers can be collected into a uniform web for selective barrier end uses. Fibers with an average fiber diameter of less that 1,000 nm can be produced.

Conventional electrospinning was problematic in that it is incapable of making a continuous filament (yarn) by a simple and continuous process. To solve the above problem, there is provided a method for making a continuous filament consisting of nanofibers according to the present invention, wherein a polymer spinning liquid is electrostatically spun to a collector 7 through nozzles 5 to obtain a nanofiber web 17a of ribbon form, then the nanofiber web 17a is passed through an air twister 18 and twisted to obtain a nanofiber filament 17b of a continuous filament form, and then the nanofiber filament 17b is drawn.

Provided are a spinning apparatus capable of stably spinning fibers having a small fiber diameter with a high productivity, an apparatus comprising the same for manufacturing a nonwoven fabric, a process for manufacturing a nonwoven fabric using the nonwoven fabric manufacturing apparatus, and a nonwoven fabric produced by the process.

The spinning apparatus of the present invention comprises one or more exits for extruding liquid, which are capable of extruding a spinning liquid, and one or more exits for ejecting gas, which extend linearly and are located upstream of each of the exits for extruding liquid and which are capable of ejecting a gas, wherein a shearing force by the gas and its accompanying airstream can be single-linearly exerted on the spinning liquid extruded. The apparatus of the present invention for manufacturing a nonwoven fabric comprises a fibers collection means as well as the spinning apparatus. The process of the present invention for manufacturing a nonwoven fabric is a process using the apparatus for manufacturing a nonwoven fabric. The nonwoven fabric of the present invention is a nonwoven fabric produced by the process.

A fully compostable container is provided having an enclosed body with an opening through an interior surface and an exterior surface. The enclosed body having a plant fiber structural layer configured to biodegrade in ambient conditions into nontoxic residue and a fluid barrier layer formed on a first side of the structural layer to form the interior surface of the enclosed body, the fluid barrier layer configured to biodegrade in ambient conditions into nontoxic residue. The container is gradually biodegradable when exposed to a set of factors in a natural environment and has a shelf life of six months when stored under standard commercial conditions.

The invention relates to a method for preparing a polyacrylonitrile carbon fiber precursor. The method comprises the following steps of: copolymerizing acrylonitrile and copolymerization components in multicomponent solution so as to form polymer spinning stock solution which has a relatively uniform and controllable molecular structure, performing demonomerization on the spinning stock solution,defoaming, filtering, and preparing the polyacrylonitrile carbon fiber precursor by a dry-jet wet-spinning process. The key technology of the method is that: a gas storage box is arranged on a dry wet spinning pack, the gas storage box and the liquid level of coagulating bath fluid form a dry-jet wet-spinning air layer into a confined space, and ammonia is persistently aerated into the space to carry out gas-liquid reaction with spinning solution trickle in the air layer. The polyacrylonitrile precursor prepared by the method has regular sections and few defects, the density is not less than 1.187g/cm<3>, the density after carbonization is not less than 1.79g/cm<3>, the strength is not less than 5.1GPa, and the modulus of elasticity is 280 to 300GPa.

This invention relates to a static filature device pushed by a gas layer and its industrial application, in which, the device includes: a gas circulation push device, a gas drying and heating device, a sealed filaturing room, and air inlet at the top of the sealed room, a material room at the upper part of the sealed room, a spinneret at the lower part of the material room, electrode connected on the spinneret, a material receiving device at the lower part of the sealed room, an air outlet at the lower-right part of the room, a cooling device cooling gas flow with solvent and a solvent recovering device, which can make static filature to molding to polymers, increases spinning efficiency greatly by applying multiple sprayers, controls the temperature and humid of the entry flows to alter the temperature and humid of filature raw liquid, and further more, the pushed gas flow can drive the volatiled solvent in the process to flow out to be recovered.

The present invention provides a process for making an integrally skinned asymmetric polybenzoxazole hollow fiber membrane comprising spinning a dope solution via a dry-wet phase inversion technique to form a porous integrally skinned asymmetric o-hydroxy substituted polyimide or an o-hydroxy substituted polyamide hollow fiber membrane comprising microporous inorganic molecular sieve followed by thermal rearrangement at a temperature from about 250° to 500° C. to convert the polyimide or polyamide membrane into a polybenzoxazole membrane. These membranes contain microporous inorganic molecular sieve materials that can have a particle size from about 20 nm to 10 μm.

Provided is a nanofiber spinning method and device for producing a high strength and uniform yarn made of nanofibers with high productivity and at a low cost.

The device includes: a nanofiber producing unit (2) which produces nanofibers (11) by extruding polymer solution, prepared by dissolving polymeric substances in a solvent, through small holes (7) and charging the polymer solution, and by allowing the polymer solution to be stretched by an electrostatic explosion, and which allows the nanofibers to travel in a single direction; a collecting electrode unit (3) to which an electric potential different from that of the charged polymer solution is applied, and which attracts the produced nanofibers (11) while simultaneously rotating and twisting the nanofibers, and gathers them for forming a yarn (20) made of the nanofibers (11); and a collecting unit (5) which collects the yarn (20) passed through the center of the collecting electrode unit (3).

A polyurethane elastic fiber, containing inorganic compound particles that have an average particle size of 0.5 to 5 mm and that show a refractive index of 1.4 to 1.6, having at least one protruded portion that has a maximum width of 0.5 to 5 μm, in the fiber surface, per 120-μm length in the fiber axis direction.

A method of forming a fiber made of peptide nanostructures is disclosed. The method comprises: providing peptide nanostructures in solution, and fiberizing the solution thereby forming at least one fiber of the peptide nanostructures. Also disclosed are methods of forming films and other articles using the peptide nanostructures.

The invention relates to a flexible inorganic fiber material and a preparation method thereof. The preparation method of the flexible inorganic fiber material comprises the steps as follows: firstly, at least one metal source is dissolved in a solvent, a coupling agent and a surfactant are added sequentially and uniformly mixed to prepare a homogeneous and stable precursor solution which contains interpenetrating molecular chains adopting a three-dimensional network structure, and then a precursor fiber material is prepared by the precursor solution through a spinning forming process; and the precursor fiber material is calcined in an appropriate atmosphere to obtain the flexible inorganic fiber material. According to the invention, various inorganic fiber materials can be prepared through different spinning processes, the preparation process is simple and high in yield, and the prepared inorganic fiber material has good flexibility and has broad application prospect in the fields of catalysis, energy, electronics, filtration, thermal insulation and the like.

A rotating-disk spinning method features that the polymer solution is applied onto high-speed rotating disk at constant speed, under the action of centrifugal force the solution flys toward all around to become high stretched fibres, and after the solvent is evaporated, the non-woven fabric of superfine fibres is collected. Its spinning apparatus is composed of a rotating disk fixed to shaft driven by power mechanism, a container of polymer solution, and a fibre collector. Its advantages are simple technology, low cost, high-strength fine fibres, and high productivity.

The invention relates to a method and a device for producing substantially endless fine threads from polymer solutions, especially spinning material for lyocell, wherein the spinning material is spun from at least one spinning hole or a spinning slot. The spun thread or film is drawn by high-speed accelerated gas flows using a Laval nozzle whose narrowest cross-section is located beneath the point where the spinning material exists. The threads are arranged on a strip in the form of a non-woven or are taken up in the form of a yarn and are subsequently separated in spinning baths by means of solvents.

A process and apparatus for producing nanofiber and polymer web, the electroconductive rotary vessel (1, 36) having a plurality of small holes (3) is rotated while supplying a polymer solution (11), prepared by dissolving a polymer material in a solvent, into the rotary vessel (1, 36). Electric charges are applied by electrifying means (14, 19) to the polymer solution (11) which flows from the small holes (3) in the rotary vessel (1, 36). The flowout linear polymer solution (11) is stretched by electrostatic explosion induced by centrifugal force and the evaporation of the solvent to produce nanofibers (f) formed of a polymer material. The nanofibers (f) in the course of the production thereof are allowed to flow so as to be deflected from one side to the other side in a shaft center direction of the rotary vessel (1, 36) by a reflection electron (16) and/or air blow means (34, 46, 59) and to be deposited to produce a polymer web, whereby nanofibers and a polymer web using the nanofibers can be produced with good productivity uniformly and in a simple construction.

The invention relates to a method for preparing an aramid IIII fiber, which comprises the following steps of: (1) synthesizing a spinning stock solution, carrying out low-temperature copolymerization by adopting three monomers of p-phenylenediamine, paraphthaloyl chloride and 5(6)-amido-2-(4-amidophenyl)benzimidazole as raw materials and adopting dimethylacetylamide/lithium chloride as a solvent; (2) spinning by adopting a dry method spinning process, i.e. leading the spinning stock solution obtained in the previous step to pass through a spinneret and directly enter a hot inert gas channel and evaporating and removing the solvent in the spinning stock solution by utilizing a hot inert gas to obtain cured raw yarn; and (3) carrying out water washing and heat treatment on the raw yarn and winding to obtain the aramid IIII fiber. The method has high solid content of the spinning stock solution, high spinning speed, great improvement of spinning efficiency, obvious reduction of fiber manufacturing cost, improved mechanical performance of the manufactured aramid IIII fiber and wide application prospect.

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 provides a polyimide fiber comprising a polymer with a structure shown in a formula (I) in the specification, wherein m is the proportion of a repeat unit with a structure shown in a formula (II), in the structure of the polymer, and is more than and equal to 0.8 and less than and equal to 0.95. The invention also provides a preparation method of the polyimide fiber, comprising the following steps of: mixing p-phenylenediamine, 4,4'-diaminodiphenyl ether and 3,3',4,4-biphenyltetracarboxylic dianhydride in an organic solvent to carry out condensation polymerization so as to obtain a polyamic acid spinning solution, wherein proportion of the mole number of the p-phenylenediamine to the total mole number of the p-phenylenediamine and the 4,4'-diaminodiphenyl ether is 0.8-0.95; spinning to obtain polyamic acid protofilaments by using the polyamic acid spinning solution; carrying out imidization processing on the polyamic acid protofilaments to obtain polyimide nascent fibers; and carrying out hot stretching processing on the polyimide nascent fibers to obtain the polyimide fiber.