73results about "Flash-spinning methods" patented technology

The invention relates to a flash evaporation material with a high transmission-reflection ratio, which is characterized in that the raw material of the flash evaporation material comprises polyethylene; the Frazier air permeability of the flash evaporation material is 0.45-0.85 m < 3 > / (min.m < 2 >); the transflective ratio of the flash evaporation material is 2-7m < 3 > / (min.m < 2 >. Mm), and the transflective ratio is equal to (Frazier air permeability. Reflectivity) / thickness. Through comprehensive regulation and control and balance of four groups of core parameters including the solvent ratio, the spinning parameters, the web forming speed and the hot rolling process, part of performance pain points in the prior art are solved, and the design requirement for the proper transflective ratio is met.

The invention relates to a flash evaporation material with high transparent strength and a preparation method thereof, the flash evaporation material comprises the following raw materials: polyethylene with high transparent strength of 0.2-3 kN / m; the high-permeability strength is equal to the moisture permeability index * the longitudinal tensile strength; the test standard of the tensile strength is a constant-speed tensile method for testing the tensile strength of paper and paperboards according to GBT 12914-2018; the test standard of the moisture permeability index is GB / T 11048-2018 determination of thermal resistance and moisture resistance (evaporation hot plate method) under the physiological comfort steady state condition of the textile. The flash evaporation material disclosed by the invention has relatively good high-transmittance strength.

An enhanced flash evaporation / electrospinning composite spinning equipment includes a flash spinning equipment, an electrospinning equipment, and a grounded receiving conveyor belt; the flash spinning equipment includes a flash spinning spinneret unit, the flash spinning spinneret unit includes a first spinneret, and the first spinneret is grounded; the electrospinning equipment includes a high-voltage power supply and an electrospinning spinneret unit, the electrospinning spinneret unit includes a second spinneret, and the second spinneret is connected to the high-voltage power supply; the first spinneret and the second spinneret are both located above the receiving conveyor belt at opposite positions with a distance of D, and the value range of D is 15-40 cm. The enhanced flash evaporation / electrospinning composite spinning equipment has a simple structure, and can prepare products that are not easy to delaminate, and excellent in waterproof performance and air permeability.

The present invention relates to a flash-spun fabric with low compression ratio, wherein the raw material of the flash-spun fabric comprises polyethylene, and the gram weight of the flash-spun fabric is 35 g / m 2 Above; compression ratio of flash spun fabric is greater than 0.08gf·cm / cm 2 The hygroscopic expansion rate of the flash-spun fabric is 0.2% to 0.4% when the relative humidity is between 33% and 84%. The flash-spun fabric of the present application has a wide range of applications.

The invention discloses a steering device, flash spinning equipment and a spinning method thereof, the steering device comprises a flow guide plate and a steering plate, the flow guide plate is arranged on one side of a nozzle of a flash spinneret, and the steering plate is arranged on one side, deviating from the flash spinneret, of the flow guide plate; an arc-shaped steering surface is arranged on the side surface, facing the flow guide plate, of the steering plate, and is bent towards the direction of the flow guide plate; a flow guide surface is formed on the top surface of the flow guide plate, the flow guide surface is formed by sequentially connecting N curved surfaces, and the curvature radiuses of the N curved surfaces are gradually reduced in the direction close to the steering plate; and the curvature radius of the curved surface closest to the steering plate is the same as that of the steering surface. According to the technical scheme of the embodiment, the fiber bundles falling on the flow guide surface can be dispersed step by step along with different curvatures of the curved surface, and the problem that the fiber bundles are accumulated at impact points and cannot form a net uniformly subsequently is effectively solved.

The invention relates to a flash medical protective material with better softness and hardness, the flash medical protective material comprises the following raw materials: polyethylene, and the mass fraction of the polyethylene in the flash medical protective material is more than 90%; the gram weight of the flash medical protective material is greater than 35g / m < 2 >; the soft hardness of the flash medical protective material is 0.07-0.28 (N2 * m < 2 >) / g; softness = (tensile strength in the MD direction * softness in the MD direction + tensile strength in the CD direction * softness in the CD direction) / gram weight; the test standard of the tensile strength is ASTM D5035; and the test standard of the softness is GB / T 8942-2016. The medical flash evaporation protective material disclosed by the invention has relatively good softness and hardness.

The present invention relates (i) to a spin fluid for flash spinning a polyethylene or a polyethylene blend comprising an azeotropic or azeotrope-like composition comprising (a) trans-1,2-dichloroethylene and 1H,1H,2H-heptafluorocyclopentane, or (b) trans-1,2-dichloro-ethylene, 1H,1H,2H-heptafluorocyclopentane, and 2H,3H-decafluoropentane, and (ii) to a process for the preparation of plexifilamentary fibrils of polyethylene or polyethylene blend using the spin fluid.

The present disclosure provides a system and method for producing nanofibers. The system includes an automated track system including a first track having a first face; and a second track having a second face facing the first face of the first track. The first track and the second track are positioned to define a proximal gap and a distal gap. The first track and the second track are adapted and configured to transfer a nanofiber coupled to the first face and the second face from the proximal gap to the distal gap. The system also includes a roving belt that is positioned to be partially disposed within the distal gap and is adapted and configured to decouple the nanofiber from the first face and the second face.

The utility model discloses an adjustable electrostatic flash spinning receiving device, which relates to the field of electrostatic flash spinning and comprises a winding roller, two sliding rings are arranged on the outer side of the winding roller in a relatively sliding manner, cleaning mechanisms are arranged on the sides, far away from each other, of the two sliding rings, each cleaning mechanism comprises a fixing plate, and the fixing plates are arranged on the winding roller. The two fixing plates are fixed to the sides, away from each other, of the two sliding rings respectively, cleaning brushes are fixed to the bottom ends of the two fixing plates, and the bottom ends of the cleaning brushes are attached to the outer surface of the winding roller. And the two connecting plates can drive the corresponding sliding rings to get close to each other or get away from each other. Therefore, the wound spun yarn is fixed between the two sliding rings, and the distance of the winding area of the spun yarn can be expanded or shortened according to needs.

The invention relates to a flash spinning nozzle which comprises a split-phase chamber, a liquid inlet pipeline and a spinning nozzle are arranged at the two ends of the split-phase chamber respectively, homogeneous spinning liquid enters the split-phase chamber from the liquid inlet pipeline and then reaches the spinning nozzle to be sprayed out, an injection port is formed in the peripheral wall of the liquid inlet pipeline, and the injection port is communicated with the liquid inlet pipeline. The injection port is used for injecting a solvent into the liquid inlet pipeline, and the solvent is not dissolved in the homogeneous spinning solution in the state that the homogeneous spinning solution is located. The flash spinning nozzle is provided with the injection port, and the solvent insoluble in the homogeneous spinning solution is injected into the homogeneous spinning solution through the injection port, so that the homogeneous spinning solution is subjected to phase separation, and then spinning is realized; according to the flash spinning nozzle, the homogeneous spinning solution is subjected to phase separation in a solvent injection mode instead of a pressure reduction mode of a throttling valve and a pressure reduction chamber in a traditional nozzle, so that the flash spinning nozzle can be suitable for homogeneous spinning solutions of different formulas, and the flash spinning nozzle is higher in adaptability.

The present invention relates to (i) an azeotropic or azeotrope-like composition comprising (a) cis-1,2-dichloroethylene and cis-1H,2H-octafluorocyclopentane or comprising (b) trans-1,2-dichloroethylene and trans-1H,2H-octafluorocyclopentane, (ii) a spin fluid for flash spinning comprising these azeotropic or azeotrope-like compositions and a polyolefin, and (iii) a process for the preparation of plexifilamentary fibrils of polyolefin using the spin fluid.

The transfer kettle for continuously transferring the flash spinning solution comprises a transfer kettle body with an upper opening and a lower opening; the transfer jacket is used for controlling the temperature of the transfer kettle body; the transfer driving device is used for providing balance and transfer power for the solution in the transfer kettle body; the solution input structure, the transfer pressure detection control structure, the transfer temperature detection structure and the transfer liquid level detection structure are mounted on the transfer kettle body; a solution inner input port of the solution input structure, which is positioned in the inner space of the transfer kettle body, is arranged on the inner wall of the mixing kettle body, and the height of the solution inner input port is positioned at a position which is lower than half of the height of the transfer kettle body. According to the transfer kettle for continuously transferring the flash spinning solution, through corresponding structural design, the flash spinning solution can be continuously transferred, the transfer kettle is used for production and manufacturing of a flash spinning process, and meanwhile, the transfer kettle can be matched with other structures and methods to stably and continuously provide the flash spinning solution.

The utility model discloses a charging system for flash spinning equipment, which comprises a storage tank, a solvent filling pipe is fixedly arranged at the upper end of the storage tank, a solid material filling pipe is arranged on one side of the solvent filling pipe at the upper end of the storage tank, and a stirring mechanism for stirring and mixing materials is arranged in the storage tank. The stirring mechanism comprises a first transmission rod, a connecting rod, a second transmission rod, a stirring rod, a connecting bin and a connecting pipe, and the first transmission rod is movably arranged in the middle of the inner side of the storage tank through a bearing. The flash spinning device is good in using effect, the traditional mode that flash spinning solvent is added from one side is changed into the mode that the solvent is added in the middle of the storage tank through the extension pipe, so that the solvent is injected from the center of the storage tank and can be rapidly diffused to the periphery to form radial symmetrical flow, the flow mode better conforms to the situation that the solvent is thrown out through stirring, dead zones can be reduced, and the service life of the flash spinning device is prolonged. The polymer particles are more fully contacted with the solvent, and the mixing time is shortened.

A flash fabric having a high tensile resilience, including the polyethylene raw material. The gram weight G of the flash fabric is greater than 35 g / m2; the tensile resilience (RT) of the flash fabric is 40%-70%; and the aging toughness Z5 of the flash fabric is 5-15 (N-m) / g, where Z5=[RM5×EM5+RT5×ET5] / G. By means of improvements of the spinning raw materials and the process, the comprehensive performance of the product is improved.

The present invention relates to (i) a spin fluid for flash spinning a polyvinylidene fluoride (PVDF) or polyvinylidene fluoride blends from a spin agent comprising dichloromethane and a cyclic hydrofluorocarbon, and (ii) to a process for the preparation of plexifilamentary fibrils of PVDF or PVDF blends using the spin fluid.

Disclosed are a deflection device, a flash spinning apparatus, and a spinning method therefor. The deflection device comprises a flow guide plate (10) and a deflection plate (20); the flow guide plate (10) is arranged on one side of a nozzle (41) of a flash spinneret; the deflection plate (20) is located on the side of the flow guide plate (10) away from the flash spinneret (40); the side surface of the deflection plate (20) facing the flow guide plate (10) is provided with an arc-shaped deflection surface (21), and the deflection surface (21) curves towards the flow guide plate (10); a flow guide surface (11) is formed on the top surface of the flow guide plate (10); the flow guide surface (11) comprises N curved surfaces which are sequentially connected; and the curvature radii of the N curved surfaces gradually decrease in a direction approaching the deflection plate (20); the curvature radius of the curved surface closest to the deflection plate (20) is the same as the curvature radius of the deflection surface (21). According to the deflection device, fiber bundles falling onto the flow guide surface can be gradually dispersed on the basis of the different curvature configurations of the curved surfaces, thereby effectively preventing the problem of subsequent uneven web formation caused by accumulation of fiber bundles at the point where the fiber bundles come into contact with the flow guide surface.

The present invention relates to an article comprising a patch product comprising a skin-absorbable membrane substrate disposed on a base support and formed by at least one electrospun fiber comprised of an electrospun first compound and an electrospinning enhancer.

A magnetic response fiber material and a preparation method and an application thereof are provided, which relates to the field of oil-water separation materials. The preparation method includes: mixing a fiber-forming polymer, a primary solvent, a secondary solvent and magnetic nanoparticles to form a uniform spinning solution, where the fiber-forming polymer includes at least one of polyethylene, polypropylene and polymethylpentene; spinning the spinning solution by a spinning process to obtain the magnetic response fiber material. The prepared magnetic response fiber material has the advantages of high oil absorption speed, high oil absorption capacity and high separation efficiency. Magnetic nanoparticles have a high load, which can not only be driven by magnetic force to absorb oil floating on water surface, but also be driven to an underwater oil pollution position to absorb oil, and can be applied to water purification in oil-polluted areas that cannot be reached by manual processing.

The present invention relates to (i) an azeotropic or azeotrope-like composition comprising (1) a chlorinated compound selected from the group consisting of trichloromethane, cis-1,2-dichloroethylene, and trans-1,2-dichloroethylene, and (2) a linear or branched C6 hydrocarbon, selected from the group consisting of n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane, (ii) a spin fluid for flash spinning comprising these azeotropic or azeotrope-like compositions and a polymer, and (iii) a process for the preparation of plexifilamentary fibrils of polymers using the spin fluid.

The present invention relates to (i) a bonded sheet of nonwoven flash-spun plexifilamentary fibrils exhibiting high liquid barrier properties, a high level of air-tightness, a high degree of softness, and good mechanical strength, (ii) a process for the preparation of a bonded sheet of nonwoven flash-spun plexifilamentary fibrils, and (iii) a multilayer sheet structure and an article comprising the bonded sheet of nonwoven flash-spun plexifilamentary fibrils.

The present invention relates to (i) an azeotropic or azeotrope-like composition comprising dichloromethane and trans-1H,2H-octafluorocyclopentane, (ii) a spin fluid for flash spinning comprising this azeotropic or azeotrope-like composition and a polymer, and (iii) a process for the preparation of plexifilamentary fibrils of polymers using the spin fluid.

This product provides a protective wrap that improves energy efficiency and provides protection against air intrusion and moisture buildup within buildings. [Solution] 0.002~0.2(m 3 / m 2 A sheet having a plexifilamentous structure with a standardized fragile permeability of .min @ 50gsm and a standardized water head of 150-250 cm @ 50gsm.

The present invention relates to (i) azeotrope-like compositions comprising dichloromethane, 1H,1H,2H-heptafluorocyclopentane, and a hydrofluorocarbon (HFC) with 4 to 6 carbon atoms, (ii) a spin fluid for flash spinning comprising this azeotrope-like composition and a polyolefin, and (iii) a process for the preparation of plexifilamentary fibrils of polyolefins using the spin fluid.

The utility model discloses a collecting device for flash spinning equipment, which comprises a support frame, a winding mechanism convenient for winding spinning is arranged on the support frame, and an adjusting mechanism convenient for adjusting the winding position is arranged on one side of the support frame. When the motor is started, the rotating disc is driven to rotate, the fixed rod is driven to rotate along with the rotating disc, the piston block is pushed by the connecting arm and the movable rod to move repeatedly along the interior of the first hollow rod, when air in the first hollow rod is extruded to enter the interior of the second hollow rod, the piston rod is extruded to drive the sliding block to move along the groove body; when air is sucked into the first hollow rod, the piston rod resets along the second hollow rod and drives the sliding block to reset, so that the sliding block moves repeatedly, the spun yarn penetrates through the penetrating hole and then is wound on the outer side of the winding roller, the winding point can be adjusted by moving the sliding block, the spun yarn can be evenly wound on the outer side of the winding roller conveniently, and the space on the outer side of the winding roller is fully utilized conveniently.

The present invention relates to (i) a spin fluid for flash spinning comprising (a) at least one polyolefin, and (b) a spin agent comprising at least one monofluorohydrocarbon with 4 to 5 carbon atoms, and (ii) a process for the preparation of plexifilamentary fibrils of polyolefins using the spin fluid.

A flash fabric having a high tensile resilience, including the polyethylene raw material. The gram weight G of the flash fabric is greater than 35 g / m2; the tensile resilience (RT) of the flash fabric is 40%-70%; and the aging toughness Z5 of the flash fabric is 5-15 (N·m) / g, where Z5=[RM5×EM5+RT5×ET5] / G. By means of improvements of the spinning raw materials and the process, the comprehensive performance of the product is improved.

This application relates to the field of flash spinning equipment technology, and discloses a connecting device and a flash spinning equipment. The flash spinning equipment includes a control system, a mixing device, a nozzle assembly, and a connecting device. The connecting device includes a heating mechanism and a connecting pipeline. The connecting pipeline includes multiple connecting pipes and multiple adapters. Any two adjacent connecting pipes are connected through the adapters. By adopting the above technical solution, multiple output ends of the mixing device can be separately connected to multiple spinning nozzles through the connecting pipeline of the connecting device. This arrangement not only facilitates the adjustment and maintenance of the connecting pipeline when problems occur, but also allows for the adjustment of the extension route of the connecting pipeline according to environmental adaptability, reducing the occupied area.

The present invention relates to the technical field of fiber composite materials, and particularly relates to a preparation method of meta-aramid ultrafine fibers, a preparation method of meta-aramid composite paper, and an application thereof. The preparation method of the meta-aramid ultrafine fibers is as follows: meta-aramid and a solvent are mixed uniformly under heating and pressurization conditions to obtain a spinning solution, and the spinning solution is ejected through a spinneret of a flash spinning device, and the solvent in the spinning solution evaporates rapidly to obtain meta-aramid ultrafine fibers. The preparation method of the meta-aramid composite paper is as follows: the meta-aramid ultrafine fibers are evenly laid, cold-pressed and hot-pressed to obtain a meta-aramid ultrafine fiber sheet, and the meta-aramid ultrafine fiber sheet is used as the surface layer and the bottom layer, and meta-aramid film and meta-aramid paper are used as the core layer, and after being laminated and compounded in the order of the surface layer, the core layer and the bottom layer, hot pressing treatment is carried out to obtain the meta-aramid composite paper. The meta-aramid composite paper has excellent bonding strength, electrical insulation performance and mechanical properties.

The method for preparing and supplying the flash spinning solution by using the mixing kettle comprises the following steps: a mixing preparation step: vacuumizing the mixing kettle body; after the vacuumizing operation is completed, heating operation is carried out; feeding and mixing: controlling the interior of the mixing kettle body to reach a first mixing pressure and a first mixing temperature; starting a hybrid driving device to provide hybrid power, inputting a solvent into the mixing kettle body, and inputting a solute into the solvent, close to the longitudinal axis, in the mixing kettle body; a quantitative mixing step: after the input solvent and solute reach respective preset amounts, the hybrid driving device continues to provide hybrid power for quantitative mixing; and a supplying step: supplying the solution to the next production process through the lower kettle opening of the mixing kettle body. According to the method, the flash spinning solution can be prepared and supplied, the method is used for production and manufacturing of the flash spinning process, and meanwhile, the method can be matched with other structures and methods to achieve stable and continuous supply of the flash spinning solution.

The present invention relates to (i) an azeotropic or azeotrope-like composition comprising (1) dichloromethane and 2-methylpentane, or comprising (2) dichloromethane and 3-methylpentane, (ii) a spin fluid for flash spinning comprising these azeotropic or azeotrope-like compositions and a polyvinylidene fluoride (PVDF), and (iii) a process for the preparation of plexifilamentary fibrils of PVDF using the spin fluid.