12results about How to "Improve evenness" patented technology

The invention relates to the technical crossing field of polyphenylene sulfide fiber paper, special papermaking and insulation paper, in particular to high-temperature-resistant polyphenylene sulfide fiber composite insulation paper and a preparation process thereof. The high-temperature-resistant polyphenylene sulfide fiber composite insulation paper with a dense structure similar to reinforcing steel bar-mortar is prepared by preferably selecting the polyphenylene sulfide fiber with higher cost performance as a raw material and taking the aramid fibrid as a filling agent and an adhesive and adopting a wet papermaking process. The prepared composite paper has excellent temperature resistance and chemical corrosion resistance, the production process flow is short, the production process is free of pollution, the industrial production cost of the composite paper can be reduced, the temperature resistance and chemical stability of medium-and-low-end application insulation paper are improved, the application field of the composite paper in a more severe environment is widened, and the composite paper has good application prospects. Good economic benefits and application values are realized.

The invention relates to the technical field of synthetic fiber paper manufacturing, in particular to meta-aramid paper and a preparation method thereof.The preparation method comprises the steps that para-aramid chopped fibers and potassium hydroxide are added into dimethyl sulfoxide, then water is added, stirring and dispersing are conducted, and nanofiber dispersion liquid is obtained; adding meta-aramid chopped fibers into the nanofiber dispersion liquid for defibering, and uniformly mixing to obtain a meta-aramid chopped fiber dispersion liquid; the preparation method comprises the following steps: continuously and stably adding a meta-aramid polymer liquid, a nanofiber dispersion liquid and a precipitation agent into precipitation equipment, carrying out high-speed shearing to obtain a fibrid, carrying out cooling molding in a water washing pool, and carrying out multi-stage water washing to obtain the meta-aramid fibrid, the meta-aramid chopped fiber dispersion liquid and the meta-aramid fibrid are subjected to defibering and stirring and then subjected to wet forming, squeezing, drying and hot pressing, and the meta-aramid paper is obtained. The meta-aramid paper has higher tensile strength, uniformity, tightness and insulating property, and better internal binding force and surface strength.

The invention relates to the technical field of spinning combing, and discloses a method for determining an equal-gauge combing integral cylinder, which comprises the following steps of: 1, establishing a mechanism model of a nipper of a cotton spinning combing machine and a driving mechanism of the nipper; 2, establishing a coordinate system with a nipper pendulum shaft as the center, and constructing a mathematical model of the position coordinates of the lower edge point P of the nipper lip of the upper nipper; 3, the coordinate positions [# imgabs0 # and # imgabs1 #] of different rack cylinder needle teeth are determined; 4, according to the carding timing, the carding gauge # imgabs2 is determined; and step 5, determining the compensation distance of different needle rows of the cylinder during equal carding gauge. According to the combing integral cylinder designed and manufactured by the technology, equal-spacing carding can be ensured all the time in the working process, the carding effect is maximized, the content of neps, defects and short fibers of combed slivers can be remarkably reduced, the yarn evenness of the combed slivers is improved, physical and mechanical properties such as strength, luster and appearance of combed yarns are improved under the same condition, and the quality of the combed yarns is improved. And the quality of combed slivers and resultant yarns is improved.

This invention relates to a blending process for hemp fiber and sorona fiber, belonging to the technical field of blending and processing of natural fibers and bio-based elastic fibers. The blending process for hemp fiber and sorona fiber of this invention includes the following steps: raw material selection → pre-spinning process → post-spinning process → packaging. This invention solves the problems of poor spinnability, high breakage rate, and stiffness and wrinkling in pure wet-spun hemp through specific proportions and wet spinning processes, achieving high-count, stable, and high-quality production. This significantly improves spinnability, enhances yarn quality, and greatly improves hand feel and comfort, achieving high elasticity and comfort to meet user needs.

The invention relates to the technical field of synthetic fiber paper manufacturing, in particular to para-aramid paper and a preparation method thereof, and belongs to the technical field of synthetic fiber paper manufacturing. The preparation method comprises the following steps: adding para-aramid chopped fibers and potassium hydroxide into dimethyl sulfoxide, then adding water, and stirring and dispersing to obtain nanofiber dispersion liquid; adding para-aramid chopped fibers into the nanofiber dispersion liquid for defibering, and uniformly mixing to obtain para-aramid chopped fiber dispersion liquid; the preparation method comprises the following steps: continuously and stably adding a meta-aramid polymer liquid, a nanofiber dispersion liquid and a precipitation agent into precipitation equipment, carrying out high-speed shearing to obtain a fibrid, then carrying out cooling molding in a water washing pool, and carrying out multi-stage water washing to obtain the meta-aramid fibrid, and carrying out wet papermaking on the para-aramid chopped fiber dispersion liquid and meta-aramid fibrid to obtain the para-aramid paper. The para-aramid paper is higher in mechanical property, good in uniformity and high in density, and the glue penetration risk in the process of preparing honeycombs from the para-aramid paper is reduced.

The invention belongs to the technical field of spinning, and relates to a drafting device for improving the dry uniformity of vortex spinning lines. The vortex spinning front drafting area comprises a front roller, a front pressing roller, a middle roller, a middle pressing roller, an upper pin, two symmetrical upper rubber rings, a lower pin, two symmetrical lower rubber rings, a small pressing roller, a transmission assembly and a lifting mechanism. The small compression roller is parallel to the middle compression roller, penetrates through the two upper rubber rings at the same time and makes contact with the upper surfaces of the working edges of the two upper rubber rings, the distance between the contact point and the jaw of the front roller is D1, the length of the spun fiber raw material is L, and the absolute value of the difference value between D1 and L does not exceed 3 mm; the transmission assembly is used for driving the small compression roller to operate along with the middle roller in the same direction and at the same speed so as to apply acting force F1 parallel to the operation advancing direction of the working edges of the upper rubber rings to the two upper rubber rings; and the lifting mechanism is used for adjusting the height of the small compression roller so as to apply a vertically downward acting force FN to the two upper rubber rings. The drafting device is simple in structure, and the air vortex spinning line evenness can be effectively improved.

A spiral rod is arranged on the inner side wall of a rotary drum in an attached mode, an opening is formed in the upper end of the outer side wall of the rotary drum, the upper end of the spiral rod is fixedly connected with the inner wall of a drum body, a conveying channel for conveying rice from the opening is formed in the drum body, and the rotary drum is driven by a motor to rotate. The mass of the rice is larger than that of chippings and impurities adsorbed on the surface of the rice, the large-mass rice firstly generates the centrifugal force to be attached to the inner wall of the rotary drum, the dust collector is started after the rice is centrifuged, and the chippings and the impurities adsorbed on the surface of the rice are sucked out through the dust collector; rice attached to the inner wall of the rotary drum is conveyed to the opening through the spiral rod, the rice enters the conveying pipeline from the opening under the action of centrifugal force and then is discharged from the discharging pipe, in order to further improve the uniformity and cleanliness, air is blown to the lower end of the rotary drum through the exhaust fan, chippings and impurities adsorbed on the surface of the rice are blown again, and the rice is conveyed to the conveying pipeline through the spiral rod. And then the dust collector is used for adsorbing chippings and impurities.

The application relates to a spinning method of a two-component blended yarn, which adopts a double-feeding double-separation comb rotor spinning technology, and the two-component blended yarn is composed of first-component fiber segments and second-component fiber segments arranged alternately; first, the ratio S of the length L1 of the first-component fiber segments to the length L2 of the second-component fiber segments in the two-component blended yarn is set, S is not equal to 1, and the types or colors of the first component and the second component are different; then, the included angle lambda between the vertical line C1 of the first-component corresponding fiber outlet and the rotary axis of the rotor and the vertical line C2 of the second-component corresponding fiber outlet and the rotary axis of the rotor is calculated; finally, the feeding mass ratio of the first component to the second component is controlled to be 1:1, the spinning is carried out according to the calculated included angle lambda, and the two-component blended yarn is obtained. The application can realize accurate regulation and control of the interval distance proportion of the two-component fiber segments on the yarn surface, and the obtained yarn strength and yarn evenness are good.

The invention relates to an ultra-high molecular weight polyethylene fiber with good spinnability as well as a preparation method and application of the ultra-high molecular weight polyethylene fiber. The manufacturing method of the ultra-high molecular weight polyethylene fiber comprises the following steps: 1) carrying out first mixing on ultra-high molecular weight polyethylene and a solvent at a first temperature, and then carrying out second mixing at a second temperature higher than the first temperature to prepare a spinning solution, and 2) spinning the spinning solution into the ultra-high molecular weight polyethylene fiber, wherein the simply supported beam impact strength of the ultra-high molecular weight polyethylene is 30-120kJ / m < 2 >. According to the method, the impact strength of the simply supported beam is tested, the raw materials with less entanglement are screened out, and the highly uniform spinning solution is formed through two-stage swelling, so that the state of the raw materials is consistent in the unentanglement process, a good spinnability effect is achieved, and a fiber product is low in linear density, good in yarn evenness and more suitable for being applied to fabric.

The invention relates to the technical field of cloth pulp machines, and provides a cloth pulp machine for controllable formation of multiple layers of fibers and a control method of the cloth pulp machine. Comparing the layer pressure Pi with a target pressure Ptarget; and controlling the pulp distributor according to the comparison result. The pulp distribution machine is controlled through the layer pressure Pi, layered independent pulp supply can be achieved, controllability of composition and thickness of each layer of fibers is guaranteed, fiber flocculation and local deposition are remarkably reduced, the uniformity of paper sheets is improved, coupling of interlayer adjustment is avoided, and sensitivity and reliability of system adjustment are guaranteed.

The utility model discloses rice processing equipment capable of improving rice uniformity, which comprises a uniform cleaning device and a dust removal device, the uniform cleaning device and the dust removal device are fixedly mounted on a support frame, a screen is arranged at the bottom of the support frame and is supported by a bracket, the uniform cleaning device comprises a vibration tank structure and a polishing device, and the vibration tank structure is connected with the dust removal device. The dust removal device comprises a water tank, a tank cover and a recovery fan, the polishing device comprises a telescopic pile, a cover body and a rotary polishing assembly, the rotary polishing assembly comprises a stirring motor, an extension frame and a polishing stone, and the vibration tank structure comprises a servo motor, an eccentric wheel and a polishing tank. The utility model belongs to the technical field of rice processing, and particularly relates to a rice grinding device which is provided with a rotary grinding assembly to be matched with a vibration tank structure to grind rice, improves the uniformity and cleanliness and removes bran at the same time, and is provided with a dust removal device to recycle bran, dust and rice flour generated by grinding.

The invention relates to the technical crossing field of polyphenylene sulfide fiber paper, special papermaking and insulation paper, in particular to polyphenylene sulfide fiber insulation paper with high content of muscovite and a preparation process of the polyphenylene sulfide fiber insulation paper with the high content of muscovite. Polyphenylene sulfide fibers with high cost performance and high market acceptance are preferably selected as raw materials, aramid precipitation and aramid pulp are used as adhesives, and the polyphenylene sulfide fiber insulation paper with the high content of muscovite is prepared. High-temperature-resistant and high-insulation muscovite flakes are used as functional components with low dielectric loss, low dielectric constant and thermal shrinkage resistance, a wet papermaking process is adopted to prepare the polyphenylene sulfide fiber insulation paper with high muscovite doping amount, the insulation paper has excellent thermal stability and low dielectric loss characteristics, the dielectric strength is guaranteed, meanwhile, the dielectric loss value is low, and the insulation performance is good. And the production process flow is short, the production process is pollution-free, and the method can be applied to the middle-end insulation market.