19results 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 is applicable to the technical field of spinning, and provides a blended double-short-fiber double-filament core-spun wrapped siro compact spinning yarn, the yarn comprises combed cotton fibers, regenerated cellulose fibers and filaments, the filaments are respectively subjected to core-spun with the combed cotton fibers and the regenerated cellulose fibers and then twisted, and two core-spun structures and a twisting structure are provided; the blending proportion of the yarn is calculated according to the weight percentage under the common moisture regain, the blending proportion of the combed cotton fibers is 22%-35%, the blending proportion of the regenerated cellulose fibers is 22%-35%, and the blending proportion of the filaments is 30%-56%. The invention further provides a spinning process of the blended double-short-fiber double-filament core-spun and wrapped siro compact spinning yarn. The blended double-short-fiber double-filament core-spun and wrapped siro compact spinning yarn is high in strength, good in evenness and few in slubs and details, and a fabric made of the yarn has the advantages of being comfortable, soft, capable of absorbing moisture, breathable, resistant to abrasion and wrinkles, bright in color, high in color fastness and the like.

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.

The invention relates to an auto-leveling device and method for a hemp and wool drawing frame. The auto-leveling device comprises a detection device, a drafting device and an auto-leveling control device, the detection device comprises a pair of detection rollers, and pressure sensors are arranged in the detection rollers; the drafting device comprises a rear roller pair, a middle roller, a pressure roller and a front roller pair, the rear roller pair comprises a rear roller and a rear leather roller, a rear jaw is formed between the rear roller and the rear leather roller, and the front roller pair comprises a front roller and a front leather roller, and a front jaw is formed between the front roller and the front leather roller; the auto-leveling control device comprises a first servo motor, a second servo motor, a third servo motor and a controller. The drafting device in the auto-leveling device adopts the middle roller and the pressure roller to replace an existing comb box mechanism which is complex in structure and large in inertia, the auto-leveling device is simple in structure, light in weight and small in load, speed changes can be quickly responded, high-precision draft multiple adjustment is completed, periodic pause is avoided, and draft multiple adjustment is stable.

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 present invention relates to the technical field of reconstituted tobacco production, and in particular to a method for preparing a low-chromium content substrate of reconstituted tobacco by a papermaking method, comprising the following steps: mixing and soaking reconstituted tobacco raw materials with a solvent to obtain a soaking liquid, and separating the soaking liquid to obtain a pulping material; mixing the pulping material with a diluent to obtain a diluted slurry; using a multi-stage pulping process to pulp the diluted slurry to obtain a tobacco slurry; mixing the tobacco slurry with an added fiber to obtain a reconstituted tobacco mixture; mixing the reconstituted tobacco mixture with a diluent, and papermaking to obtain a reconstituted tobacco substrate. The reconstitution process of the present invention improves the uniformity of the finished product, and in addition, by improving the existing pulping process and equipment in the papermaking industry, the control of the chromium content in the tobacco substrate is achieved.

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 utility model discloses a device for reducing spinning friction force of a spandex single-hole product, and relates to the technical field of spandex spinning. The device comprises a sliding rail which is arranged on an equipment box body below a channel opening, is positioned between the channel opening and a first roller and is parallel to the yarn outlet direction of the channel opening; one end of the slidable yarn guide can slide in the sliding rail and can be fixed to at least two designated positions, the first designated position is close to the direction of the channel opening, and the second designated position is close to the direction of the first roller; when spandex is separated and repieced up, the slidable yarn guide is fixed to a first designated position, and yarn strips can conveniently penetrate through the limiting grooves of the slidable yarn guide. When spandex is spun, the slidable yarn guide slides downwards along the sliding rail and is fixed to a second designated position. According to the device for reducing the spinning friction force of the spandex single-hole product, due to the fact that the yarn guide capable of sliding up and down is arranged, the spinning friction force is reduced, the uniformity of the quality of spandex yarn is improved, the yarn dividing mode is improved, and the production cost is reduced.

The invention relates to the field of aeronautical material processing, in particular to aircraft skin automatic cutting equipment which comprises a cross beam fixed to a base through a vertical frame and further comprises a clamping assembly arranged on the vertical frame, the clamping assembly is used for clamping and fixing a to-be-cut skin, an advancing mechanism is arranged on the vertical frame, a swing frame is arranged on the advancing mechanism, and the swing frame is used for clamping and fixing the to-be-cut skin. A dust suction pipe, a laser cutting head and two shaft brackets are fixed to the swing frame, a first roller and a second roller are connected to the two shaft brackets in a fixed-axis rotating mode respectively, a brush disc is arranged on the swing frame, a cleaning mechanism is arranged on the swing frame, a dust collection mechanism is arranged on the vertical frame, and the dust collection mechanism communicates with through holes in the center of the dust suction pipe and the center of the brush disc through pipelines. According to the automatic cutting equipment for the aircraft skin, automatic cutting of a skin plate is achieved, flatness and uniformity of a cutting face are improved, and surface cleaning and dust suction are conducted while automatic cutting of the skin plate is achieved.

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 discloses a method for preparing long hemp yarn based on photocatalysis and pectinase combined degumming, which comprises the following steps: (1) beating hemp bast into hemp and carding to obtain parallel and straight long hemp bundles; (2) processing the long ramie bundles into continuous ramie strips on a slivering machine, drafting and combining the continuous ramie strips into parallel and straight long ramie strips with uniform evenness and structure, and drafting, twisting and winding the long ramie strips through a roving frame to obtain rough yarns; and (3) uniformly mixing the photocatalyst suspension and pectinase to prepare a degummed mixed solution, putting the hemp roving into the degummed mixed solution, performing illumination treatment, taking out the hemp roving after the illumination treatment is completed, and performing water washing and drying to obtain the degummed hemp roving. According to the method, pectin, lignin and other non-cellulose colloid components in the jute fibers are removed by utilizing the photocatalyst and pectinase, the degumming condition is mild, the damage effect on the jute fibers is small, the energy consumption is relatively low, an alkaline solution is not used in the degumming process, the generated waste liquid is less, and the environmental pollution is small.

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 utility model provides a drying device for weight-reducing medicine research and development, and relates to the field of weight-reducing medicine research and development drying, the drying device comprises a drying unit, the left side of the drying unit is provided with an air supply unit, the drying unit comprises a drying box, and the right side of the drying box is movably connected with a sealing cover through a hinge; the fan blades are driven by the second motor to rotate to suck air flow into the straight pipe, impurities in the air flow can be intercepted through the intercepting net disc, the air flow in the straight pipe can be heated through the electric heating disc to become hot air flow, the hot air flow enters the inner cavity of the drying box through the conveying hopper, and the drying effect is improved. Medicine raw materials are placed in the containing disc, then the fixing frame can flatten the medicine raw materials while the first motor drives the connecting rod and the containing disc to rotate, hot air entering the drying box can be evenly blown to the surface of the medicine raw materials, and therefore the medicine raw materials can be evenly dried by the hot air, and the drying evenness and quality are improved.

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.