86results about "Spinning solution de-aerating" patented technology

The invention relates to the technical field of control systems, in particular to a high-strength polyethylene fiber melt flow control system and method. Comprising a melt conveying unit, a pressure adjusting unit, a temperature control unit, a flow monitoring unit and a central control unit, the melt conveying unit is used for conveying high-strength polyethylene fiber melt; the pressure adjusting unit is arranged in a pipeline of the melt conveying unit and used for adjusting melt conveying pressure. The temperature control unit is used for controlling the temperature in the melt conveying process; the flow monitoring unit is arranged at the tail end of the melt conveying unit and used for monitoring the melt flow in real time; the central control unit is electrically connected with the pressure adjusting unit, the temperature control unit and the flow monitoring unit, receives monitoring data of the flow monitoring unit and conducts coordinated regulation and control on the pressure and temperature of the melt through the pressure adjusting unit and the temperature control unit according to preset flow parameters. The flow of the high-strength polyethylene fiber melt is accurately controlled.

The invention belongs to the field of high-performance materials, and discloses a high-thermal-conductivity PBO fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) preparing a PBO polymer solution with a conventional molecular weight; (2) preparing an ultra-high molecular weight PBO polymer solution; (3) mixing the two PBO polymer solutions in a double-screw extruder according to a certain proportion to obtain a PBO spinning solution; (4) preparing as-spun PBO fibers by adopting a dry-wet liquid crystal spinning process and a condensed state structure regulation and control means; and (5) washing, drying, oiling and winding the as-spun PBO fiber to obtain the high-thermal-conductivity PBO fiber. According to the method, a small amount of the ultra-high molecular weight PBO polymer is added into the conventional spinning solution, the heat conduction performance of the PBO fiber is remarkably improved through the induced orientation crystallization effect of an ultra-high molecular weight PBO long chain, and the method has good application prospects in the field of high-power radio frequency microwave circuits with high requirements for heat dissipation capacity.

The invention discloses a preparation method of ultra-high molecular weight polyethylene fiber, fiber and spinning equipment, and the preparation method comprises the following steps: (1) mixing ultra-high molecular weight polyethylene powder with a solvent, uniformly swelling, and feeding into a twin-screw extruder for fully dissolving to obtain a spinning solution; spraying the spinning solution through a spinneret plate, drafting in an air gap, and cooling in a cooling bath to obtain gel silk; (2) carrying out shrinkage balance on the gel silk; then carrying out pre-extraction and pre-drying to obtain gel filaments with low solvent concentration, and storing the gel filaments in a filament containing barrel for later use; and (3) sequentially carrying out multi-stage extraction, drying, multi-stage drafting and winding on the jelly silk with low solvent concentration to obtain the ultra-high molecular weight polyethylene fiber. Through the steps of shrinkage balance, pre-extraction and drying treatment on the gel silk, adverse effects caused by solvent precipitation and gel silk shrinkage in the standing process of the gel silk can be reduced, the fiber fineness can be controlled to be stable and uniform, the production process is short, the occupied area of equipment is small, and the investment is low.

The present application relates to polybutylene terephthalate (PBT) material toothbrush filament technical field, specifically relates to a kind of multifilament version anti-lodging PBT monofilament and preparation method thereof;The preparation method is realized with the basic concept of multifilament to realize the basic form of monofilament, in the drawing process, every three monofilaments are gathered into a multifilament, in the subsequent water cooling, oiling etc. Process path, with the mode of multifilament, drafting, winding forming are completed.In the condition that monofilament specification remains unchanged, corresponding design is carried out to production process, and the quality indexes such as breaking strength, breaking strength variation coefficient, breaking elongation, breaking elongation variation coefficient of monofilament are controlled.In the realization equipment efficiency is improved three times target, product quality is upgraded, and the anti-lodging performance of PBT monofilament is improved.

The invention discloses a chinlon 6 filament based on high carboxyl modification and a preparation method thereof, and belongs to the technical field of chinlon production. The polyamide 6 filament based on high carboxyl modification is prepared by adopting PA6 slices with low-end amino groups and high-end carboxyl groups as raw materials, the ordered combining capacity of fibers and anionic dye is enhanced by reducing the content of the end amino groups and increasing the proportion of the end carboxyl groups, the dye is prevented from being accumulated on the surface, the dyeing uniformity and the dyeing permeability of the polyamide 6 filament are improved, and the dyeing quality of the polyamide 6 filament is improved. Meanwhile, the production parameter combination is precisely regulated and controlled, so that more microporous structures are reserved to adsorb the dye while the high viscosity of the high-carboxyl section is solved in the production process, and dye molecules are more easily diffused into the fiber; the prepared chinlon 6 filament based on high carboxyl modification realizes high-saturation and high-uniformity dyeing under low dye concentration, has ideal dye-uptake and fixation rate, and also has excellent dyeing effect on light-color sensitive colors, not only reduces the washing times after the chinlon filament is dyed, but also does not fade after being washed for multiple times.

The invention discloses a flame-retardant fiber prepared from a modified inorganic nano material and a production device of the flame-retardant fiber, belongs to the technical field of flame-retardant fiber production, and solves the problems that a filter element is difficult to disassemble and assemble, the filter element is inconvenient to clean and the melt filtering stability is poor in the prior art. A filter assembly is arranged in each of the two filter cavities, a switching valve is arranged on the outer wall of the melt filter, the filter states of the two filter assemblies are switched through the switching valve, each filter assembly comprises a base, and a plurality of mounting holes are formed in each base. The filter element can be mounted and dismounted by directly inserting and pulling out the inserting rod after the connecting rope is opened, so that the dismounting difficulty of the filter element is greatly reduced.

The present invention relates to a polyacrylonitrile-based carbon fiber, a polyacrylonitrile solution and a preparation process thereof, which mainly solves the problem that the presence of gel particles in the polyacrylonitrile solution in the prior art causes poor mechanical properties of the carbon fiber. The present invention provides a polyacrylonitrile-based carbon fiber, wherein the micropore radial size LP is less than or equal to 2.0 nm and the micropore aspect ratio L / LP is greater than or equal to 50 and less than or equal to 100, and optionally the diameter Cv value is less than or equal to 3%. The present invention also provides a polyacrylonitrile spinning dope, wherein the total number of gel particles with a particle size greater than 0.15 µm is less than or equal to 1×105 particles / mL, and the proportion of gel particles with a particle size greater than 5 µm to the total gel particles is less than or equal to 0.3%; wherein the equilibrium swelling degree of the gel particles is 250~5000%. The present invention also provides a preparation process of a polyacrylonitrile solution and a preparation process of a polyacrylonitrile-based carbon fiber.

The invention relates to the technical field of chemical fiber production equipment, and discloses a production device of flame-retardant anti-molten-drop chinlon 6 filaments, which comprises a production platform and a console arranged on the production platform, and further comprises a feeding assembly, the feeding assembly comprises a chinlon 6 slice feeding cylinder, a first-stage mixing assembly is arranged below the chinlon 6 slice feeding cylinder, and a second-stage mixing assembly is arranged below the first-stage mixing assembly. The tail end of the first-stage mixing assembly is connected with the second-stage mixing assembly, and the melting assembly is nested on the outer side of the first-stage mixing assembly. According to the device, a two-stage mixing structure of double-screw staggered shearing and planetary gear meshing shearing is adopted, accurate quantity control feeding is achieved through the metering screw, a global uniform shearing field is constructed, a mixing path is prolonged, the technical problems of flame retardant agglomeration and uneven mixing in traditional single-stage mixing are solved, and the flame retardant mixing efficiency is improved. According to the invention, the dispersion precision of the flame retardant in the melt is ensured to reach the required dispersion precision of filament molding, the spinneret orifice blockage and the linear density deviation are avoided through filter plate filtration and multi-stage parameter regulation and control, and the flame-retardant consistency and the molding qualification rate of the chinlon 6 filament are obviously improved.

The application discloses a kind of preparation device and process of recycled colored hollow polyester staple fiber for automotive interior, belong to polyester fiber preparation technical field, solve the problem that material is easy to jam, material disturbance is small, extrusion is not smooth in prior art, including storage tank, screw rod extruder, melt filter and spinning machine, the lower portion of storage tank and the hopper of screw rod extruder are funnel-shaped that gradually converges from top to bottom, and the outside of storage tank is provided with a clearing mechanism.The application can drive the plug rod by the extension and contraction of hydraulic cylinder and the expansion and contraction of air cushion when in use, effectively prevent the material from being jammed in the lower part of the storage tank or the upper part of the hopper, and the air cushion can supply air to the inside of the plug rod, thereby forming an air current at the opening of the plug rod, further improving the disturbance effect on the material.

A textile recycling method receives textile-waste-to-be-recycled, sorts the waste to isolate cellulose-containing articles from non-cellulose-containing articles, and re-sizes at least some of the cellulose-containing articles to create feedstock. The feedstock is processed in a cellulose solvent reactor, which has at least one ionic liquid. The ionic liquid dissolves intermolecular cellulose bonds of the feedstock to create a spinning dope. Cellulose fibers dissolved in the cellulose-bearing spinning dope solution are extruded in a cellulose coagulation bath reservoir to reconstitute at least some of the cellulose fibers, and the reconstituted fibers are wet-spun to form a continuous cellulose thread that is commercially indistinguishable from virgin fiber thread. Synthetic fiber material is vacuum-extracted or mechanically extracted from the cellulose-bearing solution and recycled into a continuous synthetic thread. Original color of textile-waste-to-be-recycled can be retained or removed, and new color can be added.

The invention relates to the technical field of regenerated polyester fiber production, in particular to regenerated high-elastic super-soft polyester staple fiber as well as a preparation method and application thereof. According to the method, regenerated polyester foam materials with the same viscosity are adopted as double-component raw materials, 0.1-2.0 wt% of a nucleating agent is added into a component A melt to improve the crystallinity, and 0.5-10.0 wt% of an aliphatic polyester oligomer is added into a component B melt to enhance the thermal shrinkage difference; the short fiber with the high-density spiral curly structure is prepared through parallel composite spinning, double-steam drafting and relaxation heat setting processes. The obtained fiber has excellent bulkiness, rebound resilience and soft hand feeling, is suitable for replacing traditional sponge and latex cotton, and is widely applied to the field of household filling.

The invention discloses a high-thermal-conductivity filler dispersion spinning assembly for producing ice-cold cotton-like filaments and a cooling process. The spinning assembly comprises a dispersion spinning assembly body and a three-partition side-blowing cooling assembly. The dispersion spinning assembly body is provided with a magnetic coupling non-penetrating-shaft dynamic shearing dispersion cavity, an annular ultrasonic vibration dispersion section and a gradient filtering unit. The side blowing cooling assembly comprises a low-temperature dry air area, an atomization wet air area and a rectification steady-state air area, and the air temperature, the humidity, the air speed and the atomization amount are adjusted in a linkage mode based on the spinning speed, the winding tension and the tow surface temperature. According to the scheme, the dispersion uniformity of the high-thermal-conductivity filler in the melt can be improved, the filtering pressure difference and spinneret orifice blockage are reduced, broken ends are reduced, the continuous spinning stability is improved, and meanwhile the contact instant cool feeling, the cotton-like style consistency and the washability are enhanced.

The invention discloses a carbon fiber precursor dry-jet wet spinning solidification device and process, and relates to the technical field of carbon fiber precursor spinning. The device comprises a spinning solution storage tank, a temperature control system is arranged on one side of the spinning solution storage tank, and the temperature control system comprises a first temperature control system and a second temperature control system; a conveying pump is fixedly installed at the bottom of the spinning solution storage tank, and high-strength and high-modulus carbon fiber production can be achieved by accurately controlling the components and temperature of the spinning solution. Physical characteristics of fibers are more consistent under stable process conditions, defects are reduced, an automatic metering and temperature control system is adopted, production efficiency can be remarkably improved, manual intervention is reduced, higher production efficiency means that more fibers can be produced within unit time, market requirements are met, production cost of unit products is reduced, and production efficiency is improved. The production cost can be effectively reduced by optimizing process conditions, such as reducing the use amount of a solvent and treating wastes.

The application discloses a preparation method of low-grain-size polyacrylonitrile precursor. The method comprises the following steps: drying and densifying the fiber after hot water drawing and oiling through 10-25 hot rollers, wherein the hot roller pressure is 0.45-0.55 MPa, the temperature interval is 146-167 DEG C, the temperature gradient between the hot rollers is 3-5 DEG C, and then the fiber after the drying and densifying treatment is subjected to steam drawing under the steam pressure of 0.30-0.60 MPa, and the drawing ratio is 4.0-4.5 times, so as to obtain the low-grain-size polyacrylonitrile precursor. The application uses steam as the heating medium, and realizes the effective regulation of the grain size of the precursor by the low-temperature long-time drying and densifying technology and the high-multiple steam drawing technology, the regulation of the drying temperature and time of the precursor bundle, the gradual removal of the water molecules in the bundle by the outward diffusion, and the crystal rupture of the grains under the high stress by the high-multiple steam drawing.

The present invention relates to the field of recycled polyester spinning technology, and more particularly to a parallel composite self-crimping polyester staple fiber made from recycled polyester, as well as a preparation method and production system thereof. This method utilizes polyester bottle flakes as a high-viscosity component and polyester foam as a low-viscosity component. Based on the establishment of a raw material viscosity database, the raw materials are proportioned to achieve intelligent, coarse viscosity adjustment. An online viscosity tester is then installed between the secondary filter and the box. Based on the measured melt viscosity, the melt viscosity is precisely adjusted by adding a chain extender and / or adjusting the shear rate of the melt stirring box, thereby stabilizing the melt viscosity difference. This ensures stable product quality and improves production efficiency.

The invention relates to the technical field of textile chemical fiber production, in particular to a production method of chinlon 66 industrial yarn and the chinlon 66 industrial yarn, and the production method comprises the following steps: step 1, performing tackifying treatment on chinlon 66 raw material slices to obtain high-viscosity chinlon 66 slices with formic acid relative viscosity of 75-93; step 2, carrying out humidifying treatment on the high-viscosity chinlon 66 slices obtained in the step 1; 3, the high-viscosity chinlon 66 slices obtained in the step 2 are subjected to melt compression, and chinlon 66 melt is prepared; 4, quantitatively feeding the chinlon 66 melt into a spinning assembly, spraying the chinlon 66 melt through the spinning assembly to form chinlon 66 nascent fibers, and then cooling the chinlon 66 nascent fibers; 5, the cooled nylon-66 nascent fiber is sequentially subjected to oiling, stretching, sizing and winding, and then the nylon-66 industrial yarn is obtained. The invention aims to solve the problem that the industrial yarn produced by the existing production method of the chinlon 66 industrial yarn has higher broken filaments and wool balls.

A dissolving and defoaming device comprises a dissolving tank, a vacuum pump, a circulating pump and at least one filter. The dissolving tank is configured to accommodate an adhesive liquid. The vacuum pump is connected with the top of the dissolving tank and is configured to remove bubbles in the viscose liquid. The circulating pump is connected to the bottom of the dissolving tank and is configured to extract the viscose liquid from the dissolving tank. The filter is connected with the circulating pump and the dissolving tank and located downstream of the circulating pump and upstream of the dissolving tank. The filter is provided with a plurality of screen meshes, and the screen meshes are different in mesh number and are configured to capture impurities and other bubbles of different sizes in the viscose liquid extracted from the dissolving tank. The dissolving and defoaming equipment can provide uniform, bubble-free and impurity-free spinning solution, is beneficial to the spinning process in the later stage and the physical properties of formed fibers, and further improves the product yield.

The application discloses a kind of preparation process of flame-retardant anti-dripping fiber, comprising the following steps: raw material mixing, efficient filtration, melt extrusion, step-by-step cooling solidification, post-processing, and flame-retardant anti-dripping fiber is prepared.The application accurately controls the proportion of flame retardant and mixing process in the raw material mixing stage, ensures that the flame retardant is uniformly dispersed in the polymer matrix, and provides efficient flame-retardant performance for the fiber;Efficient filtration link uses full-automatic replacement filter screen device to remove impurities regularly, ensures that the melt is pure and uniform;Melt extrusion and gradient cooling solidification process effectively reduces the internal stress and defects of the fiber, improves the fiber forming quality;Drafting and heat setting treatment in the post-processing stage further optimizes the fiber structure and enhances the mechanical properties.The flame-retardant anti-dripping fiber finally prepared has excellent flame-retardant anti-dripping performance and stable physical and mechanical properties, and the preparation method realizes the significant improvement of the performance of flame-retardant anti-dripping fiber through multi-link synergistic optimization.

The invention discloses application of a PA material in a composite rubber tube and a preparation method of the PA material. The used raw materials comprise butyl rubber, ethylene propylene diene monomer, lysine modified PA fibers and other auxiliaries. The preparation method of the PA material comprises the following steps: 1) preparing a lysine modified PA melt; (2) preparing non-oriented yarns; and (3) preparing the lysine modified PA fiber. The preparation method comprises the following steps: firstly, synthesizing amino-terminated and side-chain amino polyamide, reacting with bismaleimide twice in stages to obtain high-strength lysine modified PA fibers capable of being crosslinked with butyl rubber and ethylene propylene diene monomer, and carrying out thickness collaborative design on a fiber reinforced layer and a rubber layer to obtain the high-strength lysine modified PA fibers. The breakthrough of fiber strengthening and toughening, no slippage defect in interface connection and high medium resistance is achieved, the strong acid corrosion resistance, the high-pressure pulse service life and the mechanical strength of the rubber pipe are remarkably improved, and the rubber pipe is suitable for occasions such as cooling liquid pipelines, fuel oil pipelines and hydraulic systems which have high requirements for pipelines.

Provided is a method for enhancing anti-oxidative ability, anti-bacterial ability, anti-inflammatory ability and / or anti-allergic ability of a textile. The method comprises adding a cannabidiol in an alginate fiber comprising cannabidiol, wherein the textile comprises a yarn comprising the alginate fiber comprising cannabidiol, the alginate fiber comprising cannabidiol comprises the cannabidiol and an alginate, and the cannabidiol disperses in the alginate fiber comprising cannabidiol.

This invention discloses an electro-welding protective glove and its preparation method. The method comprises: S1, selecting raw materials; S2, preparing a refined terephthalic acid / graphene oxide / ethylene glycol modified slurry; S3, esterification reaction; S4, condensation reaction; S5, heating and melting the modified graphene oxide flame-retardant polyester masterbatch, then spinning it into a bundle; S6, weaving the obtained graphene oxide flame-retardant polyester filament into a woven fabric; S7, preparing a flame-retardant agent finishing solution, immersing the fabric into the finishing solution, then drying it; S8, according to the glove template, cutting and sewing the obtained fabric. This invention also provides an electro-welding protective glove prepared by the method. The method provided by this invention is simple and suitable for electro-welding and other fields, and can effectively protect human safety.

The invention discloses airflow stretching auxiliary drying coupling type PVA blow spinning equipment, which belongs to the technical field of spinning and comprises a base, a blow spinning box is arranged at one end of the top of the base, a support is arranged at the other end of the top of the base, and spinning forming drying mechanisms are uniformly arranged at the top in the blow spinning box along the circumferential direction. The stirring mechanism and the solution conveying mechanism are linked through the driving mechanism, the solution conveying mechanism can be matched with the filtering mechanism to form a negative pressure environment when working, rapid filtering and purifying of the PVA solution are achieved, manual transferring or additional filtering power devices are not needed, and the whole process comprises the steps of raw material mixing, heating and dissolving, solution storage and filtering and purifying; the whole process is completed in an integrated linkage mode, manual intervention links are greatly reduced, operation complexity is lowered, pollution and gel risks in the solution transferring process are avoided, the automation degree and production efficiency of equipment are remarkably improved, and meanwhile energy consumption is saved.

The application relates to the technical field of control systems, in particular to a high-strength polyethylene fiber melt flow control system and method. The system comprises a melt conveying unit, a pressure adjusting unit, a temperature control unit, a flow monitoring unit and a central control unit. The melt conveying unit is used for conveying high-strength polyethylene fiber melt. The pressure adjusting unit is arranged in the pipeline of the melt conveying unit and is used for adjusting the melt conveying pressure. The temperature control unit is used for controlling the temperature in the melt conveying process. The flow monitoring unit is arranged at the end of the melt conveying unit and is used for monitoring the melt flow in real time. The central control unit is electrically connected with the pressure adjusting unit, the temperature control unit and the flow monitoring unit, receives the monitoring data of the flow monitoring unit, and cooperatively adjusts the pressure and temperature of the melt through the pressure adjusting unit and the temperature control unit according to preset flow parameters, so as to realize accurate control of the high-strength polyethylene fiber melt flow.

This invention provides a process for producing cotton-type fibers from low-melting-point PET, comprising the following steps: (1) placing cotton-type fiber PET raw materials and low-melting-point PET chips into a rotary drum for drying to obtain a mixture, wherein the melting point of the cotton-type fiber PET raw materials is 250-260°C and the melting point of the low-melting-point PET chips is 180-220°C; (2) conveying the mixture to a screw extruder for melting; (3) filtering and extruding the molten melt; and (4) cooling and shaping; wherein the cooling and shaping includes ring blowing and winding oiling. This process for producing cotton-type fibers from low-melting-point PET avoids the problem of ring blockage during the screw feeding stage and prevents the chips from vaporizing at high temperatures to form bubble fibers that directly cause spinning breakage and fuzz.

The invention relates to the technical field of biological-high polymer material composite fiber membranes, and particularly discloses a method and device for rapidly preparing royal jelly nanofibers through an electronic spinning technology. Chitosan is taken and added into an acetic acid aqueous solution to obtain a chitosan solution; adding polyvinyl alcohol into deionized water to obtain a polyvinyl alcohol solution; blending the chitosan solution and the polyvinyl alcohol solution to obtain a spinning solution I; taking deionized water, and adjusting the pH value of the deionized water to a limited acidity through acetic acid to obtain acidity water; dissolving royal jelly in acidity water to obtain a royal jelly solution; mixing the royal jelly solution with the spinning solution I to obtain a spinning solution II; performing ultrasonic treatment on the spinning solution II to obtain a spinning solution III; filling the spinning solution III into an injector; wrapping a spinning receiving film on a rotary collector of the spinning machine; the received royal jelly nanofiber is subjected to gradient dehumidification and drying, and a royal jelly nanofiber finished product is obtained. The preparation method has the characteristics that active ingredients are not damaged, the release rate of bioactive substances is not influenced, and the product quality is good.

The invention relates to an acid bath filtering system and method for viscose staple fiber production, the acid bath filtering system for viscose staple fiber production comprises an intermediate tank, an acid bath circulating barrel, a spinning machine, an acid bath head tank, a mixing barrel, a degassing mechanism, a tow filtering mechanism and a flash evaporation mechanism, the acid bath head tank is connected with the spinning machine through a pipeline and supplies acid bath liquid to the spinning machine; the spinning machine is connected with the degassing mechanism through a spinning acid return barrel by a pipeline and conveys reaction liquid to the degassing mechanism for degassing, the degassing mechanism is connected with the mixing barrel through a pipeline, the mixing barrel is connected with the acid bath circulating barrel through a pipeline, and the acid bath circulating barrel is connected with the tow filtering mechanism through a pipeline. The tow filtering mechanism is connected with the flash evaporation mechanism by a pipeline through a flash evaporation feeding barrel; the flash evaporation mechanism comprises flash evaporation equipment, a concentrated acid tank, a saltpeter extraction feeding barrel, saltpeter extraction equipment and a settling tank which are sequentially connected through pipelines, the settling tank is connected and communicated with the intermediate tank through a third acid falling pipeline, and the intermediate tank is connected and communicated with the tow filtering mechanism through a return pipe.

The invention discloses spinning equipment and process for continuously polymerizing polyester yarns on a super-soft Raschel polyester blanket, and relates to the technical field of polyester fiber spinning, the spinning equipment comprises a raw material processing unit, a continuous polymerization unit, a melt conveying unit, a spinning unit, a gradient cooling unit, a drafting and shaping unit and a winding unit which are communicated in sequence; the continuous polymerization unit comprises a first-stage esterification reaction kettle, a second-stage prepolymerization reaction kettle and a third-stage final polymerization reaction kettle, the first-stage esterification reaction kettle, the second-stage prepolymerization reaction kettle and the third-stage final polymerization reaction kettle are sequentially connected in series through a conveying pipeline with an insulating layer, and each stage of reaction kettle is provided with an independent temperature control system, an independent pressure control system and an independent stirring device. The continuous polymerization unit adopts a serial structure of the first-stage esterification reaction kettle, the second-stage prepolymerization reaction kettle and the third-stage final polymerization reaction kettle, each stage of reaction kettle is provided with an independent temperature control system, an independent pressure control system and an independent stirring device, and the reaction kettles are connected through a conveying pipeline with a heat preservation layer, so that polymerization parameters of each stage can be accurately controlled.

This invention discloses an extrusion device for a composite hollow three-dimensional fiber spinning machine, comprising a frame on which a feeding assembly, a conveying assembly, a filtering assembly, an extrusion assembly, and a spinneret are sequentially connected. The spinneret is densely covered with spinneret units, each including an adjacent first through-hole and a second through-hole. This extrusion device for a composite hollow three-dimensional fiber spinning machine can simultaneously convey two different materials via the conveying assembly. After impurities are filtered by the filtering assembly, the two different materials are extruded from the first and second through-holes on the spinneret by the extrusion assembly. This allows the two materials to undergo different shrinkage amounts under simultaneous air cooling, increasing the bulkiness of the final fiber and thus improving its warmth retention. The device also features a compact structure.

The invention provides polyester fiber production equipment special for military Kevlar fabric and a production process, and relates to the technical field of fiber production. The special polyester fiber production equipment for the military Kevlar fabric comprises a reaction kettle, a diaphragm pump, pressurizing equipment, heating equipment, vacuumizing equipment, a controller, a drain valve and a spinning device. According to the invention, the synergistic effect of axial vortex and radial shearing is realized through the double-shaft differential stirring system, the mixing time of the high-viscosity melt is greatly shortened, the problem of non-uniform distribution of modified monomers caused by traditional single stirring is solved, and the dynamic circulating injection system is used for stirring the melt through high-pressure jet flow disturbance on the melt, so that the high-viscosity melt is obtained. The carboxyl and acylamino functional groups can be induced to be orderly arranged along the stress direction, so that the hydrogen bond distribution density is enhanced, the CV value of the interface peel strength of the polyester fiber is stably controlled within 2.5%, and the layering resistance of the military Kevlar fabric is remarkably improved.

There is provided a method of treating regenerated cellulose fibers for use as a fibrous feedstock, the method comprising providing a fibrous feedstock comprising regenerated cellulose fibers and treating it in the steps of: (a) contacting the fibrous feedstock with a first aqueous solution comprising a reducing agent; (b) contacting the fibrous feedstock with a second aqueous solution comprising sodium hypochlorite having a pH greater than 7; wherein step (a) is performed prior to step (b), or wherein step (b) is performed prior to step (a).