58results about How to "Spinning process is stable" patented technology

The invention belongs to the technical field of electrostatic spinning and relates to a portable handheld electrostatic spinning device. The top of a pushing rod of a medical syringe is provided with a pressure welding switch, a metal foil is arranged on the top side fixedly, a spinning solution is arranged in a front end inner cavity of the medical syringe, a square battery and a high-voltage direct-current inverter are arranged fixedly on the side wall of the syringe in a butt joint mode, and a stainless steel needle head which is used for spinning is arranged at the bottom end of the syringe in an inserting mode. A conventional medical syringe needle head structure and the syringe are combined and matched, the spinning solution is stored in the inner cavity of the medical syringe which is provided with the stainless steel needle head, the square battery provides a power supply for the high-voltage direct-current inverter, when the direct current voltage is inverted, the voltage in the unit of kilovolt, the positive pole of the high-voltage direct-current inverter is communicated electrically with the stainless steel needle head, and the negative pole of the high-voltage direct-current inverter is communicated electrically with the metal foils. The device is simple in overall structure, is convenient to carry, use and operate, applicable to occasions such as outdoor teaching and wounded rescue and high in economical value.

The invention discloses a high interface adhesion strength nanofiber composite filament bundle and a preparation method and application thereof. The preparation method comprises the following steps: 1, preparing a spinning solution with polymer, additives and solvent, wherein the polymer comprises one or more ingredients out of cellulose diacetate, cellulose triacetate, hydroxyethyl cellulose, polyving akohol and polyving akohol, and the additives comprise one or more ingredients out of ethanediol, glycerol, pentaerythritol, diacetin, glycerol triacetate, glycerol trioleate, glycerol palmitate and glyceryl stearate; 2, taking a cigarette-used filament bundle as base materials, conducting electrostatic spinning on the spinning solution which is obtained in step 1, and obtaining the high interface adhesion strength nanofiber composite filament bundle. By means of the high interface adhesion strength nanofiber composite filament bundle, the phenol release amount and NNK release amount in mainstream smoke of a cigarette can be effectively reduced, the phenol release amount is reduced by 16-30%, and the NNK release amount is reduced by 12-36%.

The invention discloses a production process for a bamboo charcoal polyester staple fibre. In the production process, regenerative PET (Polyethylene Terephthalate) material is used as the material, and the finished product is acquired by pre-treating, rotary drum drying, melt spinning, cooling and forming, winding, drafting, curling, oil applying, thermosetting and cutting-off in sequence, wherein the rotary drum drying comprises the steps of firstly drying the regenerative PET material for 5.5h-6.5h and then adding bamboo charcoal master batches with the final mass fraction of 6%-8% and including bamboo charcoal with the mass fraction of 22%-27%; and the total drying time is 9.5h-10.5h; both the screw rod and the spinning beam of a screw extruder in the melt spinning step are at the temperature from 278 DEG C to 282 DEG C; cooling forming is realized through circular air blow, the temperature of the circular air is 22 DEG C to 26 DEG C, and the air velocity of the circular air is 4.0m/s-5.0m/s; the total draft multiple is 3.1-3.3 times; and the thermosetting temperature is 162 DEG C to 168 DEG C, and the thermosetting time is 13 minutes to 17 minutes. The production process can save the cost and is helpful for environmental protection; the produced product has a better smooth and comfortable hand feeling and moisture-absorption air permeability than those of a normal polyester staple fibre.

The invention discloses a preparation process of a fine-denier high-strength polyester fiber, which includes the following steps: melting; metering and spinning; cooling and oiling; pre-interlacing; stretching and finalizing; main interlacing; and winding into a finished product. A 12-hole spinneret is used for spinning. A slow-cooling heating device is installed below the spinneret, and the temperature of the slow-cooling heating device is 8-12 DEG C higher than the surface temperature of the spinneret. Hot air equipment is used for cooling by means of circular blowing. Double oil nozzles areused for oiling, and the oiling rate is 0.85-0.95. Three pairs of rollers are used for draw-forming, and the drawing ratio is 1.75-1.85. The winding speed is 2450-2500m/min. Through the scheme, a stable spinning process is ensured, and the problem that fibers are prone to wool and broken ends is solved. Therefore, the production of the product is stable, the product is of high softness, and the fine-denier high-strength polyester fiber obtained achieves the effect of fine multifilament and can replace high-value products such as silk.

The invented method includes the following steps: uniformly mixing PPTA and concentrated sulfuric acid whose concentration is greater than 99% in mixing cylinder, preparing mixed solution in which PPTA content is 14%-24%; making the prepared PPTA mixed solution pass through twin screw extruder, further dissolving to form liquid crystal spinning solution, defoaming, fully mixing and regulating temperature, applying high shear stress to the defoamed PPTA spinning slurry in extruder machine head, filtering and metering, adopting dry-jet wet-spinning process to obtain the invented PPTA fibre.

The invention relates to a novel semi-continuous high-speed spinning machine which comprises a rack, a glue supply device, a filament strip forming device, a spinning device and a winding device. The spinning device comprises a spinning roller which is transversely arranged relative to the operating surface of a spinning face, and the two ends of the spinning roller are fixed on the rack. The novel semi-continuous high-speed spinning machine improves spinning speed, ensures that filament strips are sufficiently reacted, and then achieves the purposes of ensuring the quality of the filament strips, improving production efficiency and reducing spinning cost.

The invention relates to a method for drying a PTT slice of a PTT/PET composite full-tension low-elasticity interlaced yarn. The invention is characterized in that the PTT slice is dried by the following steps of: 1) sorting: the PTT slice is fed, in order, through a storage hopper, an oscillating screen, a pulse generator and another storage hopper; 2) pre-crystallization: the PTT slice is fed, in order, through a shaking feeder, a fluidized bed and a drying tower, and then kept in a fluidized bed pre-crystallizer for 5-15 minutes to allow the pre-crystallization to be finished; 3) drying: the PTT slice is dried with high-temperature dried air for 4-6 hours until the water content of the uniformly-crystallized PTT slice meets the standard. The inventive drying method ensures the uniform crystallization and normal color shade of the PTT dried slice and avoids the yellowing and deterioration problems. The water content of the slice is below 50ppm, which meets the technological requirements for drying PTT-POY pre-oriented yarns as well as PET composite spinning. The spinning of PTT dried slice is stable without filament drift.

The invention relates to chitosan filaments and a preparation method thereof. According to the invention, chitosan is dissolved by using a green environment-friendly ionic liquid solvent; dissolving time and temperature are reasonably controlled, such that high-concentration spinning solution is prepared. With the method, continuous production can be carried out, such that that problems of difficulty for carrying out continuous productions due to low stability and poor stability of prior art are solved. According to the invention, during the chitosan filament preparation process, the chitosan is dissolved by using the ionic liquid solvent and the gradient temperature method, degradation is prevented during the chitosan heating process, spinning process is stable, the prepared chitosan fiber has high quality, and spinning yield is high. The chitosan filament provided by the invention has high mechanical strength which is higher than 2.5cN/dex and higher than chitosan fiber prepared by using an acidic solution. Therefore, the filament is suitable for the medical field, and has higher application value.

The invention relates to a preparation method of a para-aramid low-denier fiber filament, belongs to the technical field of chemical fiber spinning, and particularly relates to a preparation method of a para-aramid low-denier (25-100D) fiber filament. The problem of wire breaking needs to be solved in the spinning process of the para-aramid low-denier fiber filament to ensure the production stability and the tow performance stability. According to the preparation method of the para-aramid low-denier fiber filament, a selected spinneret cap is used for reducing the risk of extruded cross flow and doubling of a para spinning solution; an alkali liquor with proper concentration is used for washing primary tows, thereby quickly neutralizing sulfuric acid and improving the strength of the tows; and by adopting flat washing and drying modes, the risk of wire breaking in the washing and drying links is reduced. By using the method, the spinning process of the para-aramid low-denier filament is stable and easy to operate, and the obtained fiber is excellent in mechanical property and stable in quality.

The invention provides a preparation method and device of a water-soluble polymer/inorganic nano-powder composite fiber, a lithium ion battery negative electrode material and a preparation method. Thepreparation method comprises the following steps of S1, preparing precursor slurry of a water-soluble polymer and inorganic nano-powder by taking a mixed solvent of water and ethanol as a spinning solvent, wherein the average molecular weight of the water-soluble polymer is 58000 to 1300000; and S2, carrying out electrostatic spinning on the precursor slurry under the condition that the humidityis 30%-60% to obtain the water-soluble polymer/nano-powder composite fiber. By utilizing the preparation method, the problems of difficult spinning, high cost, poor environmental protection property and the like when the composite fiber for the lithium ion battery negative electrode material is prepared by utilizing solution electrostatic spinning in the prior art are effectively solved, the water-soluble polymer/inorganic nano-powder composite fiber with good morphology can be obtained, good stability in a heat treatment process is achieved, and the composite fiber is suitable for the lithiumion battery negative electrode material.

The invention discloses a rotary embedded electrostatic spinning device and a spinning method. The rotary embedded electrostatic spinning device comprises an outer hollow cylinder spinning nozzle, aninner hollow cylinder, an injector used for injecting spinning liquid into the inner hollow cylinder, a numerical control micro-injection pump used for controlling the injector, a high-voltage positive electrode connected with the inner hollow cylinder and the like. The spinning method comprises the steps that the spinning solution is injected into the inner hollow cylinder, when the spinning solution rises and the liquid level is higher than an opening in the top of the inner hollow cylinder, a servo motor is started to drive the outer hollow cylinder spinning nozzle to rotate the high-voltage positive electrode is opened and connected, voltage is increased, a plurality of electrostatic spinning jet flows is generated above the opening, and an electrostatic spinning process is started; and the electrostatic spinning jet flows are received through a collecting device. The spinning solution can form liquid films in different states on the openings in different forms, and then the jet flows with different fineness are generated, so that a nanofiber film with four or more diameter distributions and distinct levels can be prepared in one step under the condition without using various spinning solutions and without adjusting spinning parameters.

The invention discloses a preparation process of dacron superfine fiber. The process comprises the following steps: (100) fusion; (200) metering and spinning, wherein the flow of a spinning solution subjected to the fusion is adjusted through a metering pump, and then a spinneret plate is used for erupting, spinning and forming to prepare fiber tows; a slow cooler is installed below the spinneretplate, and the slow cooler is used for slowly cooling the spinneret plate; (300) cooling and oiling; (400) pre-netting; (500) stretching and sizing; (600) main network; and (700) winding. By the mode,the process can guarantee the stable operation of spinning, the problems that broken filaments and broken ends appear easily in the fiber stretching and sizing process and dyeing performance is relatively poor are solved, and the products can be stably produced, and are high in level dyeing rate and excellent in quality.

The invention discloses orientation nanofiber and a preparing method thereof. Through the combination of air current spinning and magnetic field force, the motion track of spinning solution jet flow is controlled, and producing the orientation nanofiber is achieved. A high pressure static electricity generating device is not needed, the orientation nanofiber is simple and economical, static electricity pollution and potential danger caused by high voltage static electricity are also avoided, the spinning process is safer and more stable, multiple strands of jet flow can be generated simultaneously, the spinning smoothness and production efficiency are drastically improved, and the preparing method is applicable to producing the orientation nanofiber in an industrialized mode.

A polytrimethylene terephthalate which is reduced in cyclic dimer content and is less apt to generate cyclic dimmers during melt molding. The polytrimethylene terephthalate (A) consists mainly of trimethylene terephthalate units, has an intrinsic viscosity of 0.5-1.6 dL/g, and contains 0.01-0.5 wt.% compound represented by the following formula (I) or (II): (wherein R1, R2, and R3 are the same or different and each is a C1-10 hydrocarbon group; n is an integer of 1-5; and M is an alkali metal or alkaline earth metal, provided that when M is an alkali metal, then m is 1 and when M is an alkaline earth metal, then m is 2) (wherein R4 and R5 are the same or different and each is hydrogen or a C1-10 hydrocarbon group).

The invention discloses a preparation method of a UV resistant nonwoven cloth for a surgery hole drape. The preparation method comprises following steps: step one, mixing TiO2:(Al, Ce) powder, N,N-dimethyl acetamide, and zirconium beads, and grinding the mixture to prepare TiO2:(Al, Ce) dispersion liquid; step two, mixing polyamide and N,N-dimethyl acetamide, stirring, adding the TiO2:(Al, Ce) dispersion liquid, maintaining the temperature, and keeping on stirring to obtain a spinning solution; and step three, using the spinning solution to carry out electrostatic spinning to obtain TiO2:(Al,Ce)/polyamide nonwoven cloth, namely the UV resistant nonwoven cloth for a surgery hole drape. The prepared nonwoven cloth has a very good antibacterial and UV resistant performance.

The invention provides a rodlike electrospinning device and an electrospinning method. The rodlike electrospinning device is characterized by comprising a rodlike spinneret and a solution supply device which is connected with the rodlike spinneret to supply spinning solution to the rodlike spinneret, the spinning solution supplied by the solution supply device can be stored in the rodlike spinneret, and the rodlike spinneret is provided with a sawtoothed gap. The rodlike spinneret is connected with a high-voltage positive electrode, and when the voltage exceeds a critical value, various electrospinning jet flows can be generated in the sawtoothed gap. The rodlike electrospinning device is simple, the spinneret is less prone to blockage, jet flow interval uniformity, easiness in cleaning and high stability are realized, and spinning efficiency can be remarkably improved while electrospinning yield is greatly increased.