195 results about "Fiber strength" patented technology

The present invention relates to the field of fibers, and in particular, to a preparation method for a protein composite fiber. The preparation method comprises spinning, pretreatment, surface treatment, preparation of modified mineral powder, loading, mixing and crosslinking. A pretreated nascent fiber is immersed in a protein composite solution to be in full contact with modified extract mineral powder and a soluble protein, and a crosslinking reaction is carried out; the structure of the dried fiber is more compact; the extract and the soluble protein are more stable in the fiber while the fiber strength is improved; and the loss rate is less than 1% after washing for 50 times. The protein composite fiber prepared by the present invention is skin-friendly and soft, has good moisture absorption and moisturizing effects, and is rich in amino acid and protein, wherein the content of the protein is up to about 12%. Moreover, in the present invention, a common fiber is used as a base material, thereby achieving natural antibacterial, anti-oxidation and deodorizing effects while endowing fibers such as viscose, acrylic fibers, polyester, chinlon, vinylon, and polypropylene fibers with the advantages of a natural protein on the basis of ensuring excellent properties of the base material itself, and thus the range of application is wider.

The invention relates to an all-cotton four-way stretch fabric and a preparation method thereof, and belongs to the technical field of textile dyeing and finishing. The preparation method comprises the following steps: performing singeing, enzyme desizing, liquid ammonia finishing, loose alkali shrinkage and overfeeding soft heat setting on gray fabric to obtain the all-cotton four-way stretch fabric. The warp-wise and weft-wise shrinkage rates of the prepared four-way stretch fabric are-3.0%-0%, the warp-wise elastic elongation rate is 12%-15%, the weft-wise elastic elongation rate is 12%-18%, and the elastic residual elongation rate is smaller than or equal to 8%; obvious warp and weft elasticity can be achieved without elastic fibers, the problems that elastic fabrics such as spandex core-spun yarn fabrics are complex to manufacture, unstable in fabric size and the like are solved, the warp and weft elasticity is obvious, the size stability is good, the hand feeling is soft, and the price is low; the preparation method is simple, does not need equipment transformation, is easy to operate and does not damage fiber strength.

The invention discloses an AI parameter optimization control method and system in a melt extrusion process of regenerated polyester, and relates to the technical field of material processing. Comprising the following steps: S1, carrying out data fusion on the spectral data, the imaging data and the process parameter time sequence data to obtain fusion features; s2, constructing a hybrid model through a physical information neural network and a meta-learning hybrid model, and determining initial process parameters according to the fusion features; and S3, a reward function is constructed through the fiber strength, the unit energy consumption and the equipment wear rate, the initial process parameters are corrected according to the reward function, and the corrected process parameters are obtained. According to the method, high-dimensional feature expression is constructed through three-dimensional space-time-spectrum tensor fusion, so that the isomerism of raw material characteristics can be covered, meanwhile, space-spectrum relevance can be dynamically captured through node edge weights, and then the prediction precision of impurity distribution and melt flow is improved.

The invention belongs to the technical field of fiber strength testing equipment, and particularly discloses synthetic fiber strength tensile testing equipment and a testing method thereof.The synthetic fiber strength tensile testing equipment comprises a fiber tension tester, a mounting seat is fixedly mounted at the upper end of one side of the fiber tension tester, and a sealing assembly is arranged on the upper side of the mounting seat; a lifting assembly is arranged at the position, close to the rear side of the mounting base, of the inner side of the fiber tension tester, an air inlet assembly is arranged on the mounting base and the lifting assembly, a fixing assembly is arranged on the lower side of the air inlet assembly, and a water tank box is arranged at the position, corresponding to the mounting base, in the lower side of the fiber tension tester. Through overall cooperative use, the synthetic fiber strip is stretched in a locked space, fiber scraps generated when the synthetic fiber strip is stretched or broken by the lifting assembly are prevented from flying randomly, and meanwhile, the strength attenuation rates of different environments in a test scene are simulated.

The invention provides a waste PET lining cloth grading alcoholysis and in-situ polymerization regeneration method, and relates to the technical field of waste textile recycling, and the method comprises the following steps: adopting a near infrared spectrum combined AI image identification technology to realize waste PET lining cloth material classification, and removing pollutants through low temperature plasma-biological enzyme synergistic cleaning; putting the pretreated PET fragments into three-stage series reaction kettles, and dynamically adjusting the temperature and the catalyst concentration of each stage of reaction kettle through a control algorithm to realize PET depolymerization degree gradient control; according to the method, the graded alcoholysis and in-situ polymerization synergistic technology is adopted, so that the performance of the waste PET lining cloth regenerated fiber is improved in a leap-over manner, the molecular weight and the fiber strength of the regenerated PET are improved through the three-stage tandem reaction kettle and the control algorithm, and the technical bottlenecks that the strength of a physical method is low and the molecular weight loss of a chemical method is large are broken through; the mechanical property of the regenerated material is obviously improved.

The invention relates to the technical field of fibers, in particular to a controlled-release anti-aging polypropylene fiber and a preparation method thereof. The fiber is prepared from polypropylene homopolymer resin, a reaction type interface layer master batch and a controlled release anti-aging master batch, the reactive interface layer master batch is formed by reacting and extruding maleic anhydride modified polypropylene and 3-aminopropyl terminated polydimethylsiloxane, so that the interface compatibility is enhanced; the controlled-release anti-aging master batch contains hydroxyl and peracetylated cyclodextrin grafted siloxane carriers, and an ultraviolet absorbent, a light stabilizer and an antioxidant are included, so that the controlled release of an anti-aging agent is realized. The preparation method comprises the steps of master batch preparation, final mixing granulation, melt spinning and drafting setting. The fiber strength is remarkably improved, the boiling water shrinkage rate is reduced, the strength retention rate after ultraviolet aging reaches 93% or above, the yellow index change is small, and the outdoor service life is prolonged.

The invention relates to a blended yarn and a preparation method thereof, the blended yarn comprises a three-layer composite structure: a surface layer comprises a single-sided single jersey weave woven by 50D-150D supercritical CO2 waterless dyed polyester filament yarn, and the single-sided single jersey weave accounts for 30%-70% of the total mass of the blended yarn; the middle layer comprises lyocell colored spun yarn which is connected through tuck loops, the lyocell colored spun yarn comprises 5wt%-15wt% of black lyocell fibers and 85wt%-95wt% of fibril which are blended, and the surface of the lyocell colored spun yarn is coated with a chitosan / sodium alginate ion cross-linked composite layer; the inner layer comprises looped pile weaves woven by lyocell colored spun yarns, the looped pile weaves are subjected to crosslinking treatment through a CaCl2 solution to form a calcium alginate flame-retardant layer, and the surface resistivity is smaller than or equal to 1 * 10 < 9 > omega.cm. The blended yarn provided by the invention is self-assembled through chitosan / sodium alginate ions, so that flame retardance, antibacterial property and antistatic property are synchronously realized; the water consumption is reduced by supercritical CO2 dyeing, and the fiber strength is protected by low-temperature setting.

The invention relates to the technical field of polypropylene fibers, in particular to a high-strength polypropylene fiber and a preparation method thereof. The problems that in the prior art, polypropylene fibers are low in strength and poor in temperature resistance are solved. The preparation method comprises the following steps: respectively prefabricating master batches through silane coupling agent modified nano titanium dioxide and carboxylated multi-walled carbon nanotubes, carrying out melt blending on the master batches, isotactic polypropylene, ultra-high molecular weight polypropylene, a liquid crystal polymer, a beta-nucleating agent and the like, and combining a double-region cooling process under high-speed spinning and two-stage temperature difference drafting to obtain the high-strength polypropylene fiber. According to the method, hierarchical dispersion and interface strengthening of nano components in a polypropylene matrix are achieved, the molecular chain orientation degree and crystallization regularity of the fiber are remarkably improved while good processability is maintained, and finally the performance of the polypropylene fiber is greatly improved.

The invention relates to the technical field of strength detection, and discloses a textile flame-retardant fiber strength detection device which comprises a testing machine main body and clamps, a group of symmetrically arranged base plates are arranged between the two clamps, upper clamping blocks are arranged on the two sides of the base plate located at the upper end of the testing machine main body, and lower clamping blocks are arranged on the two sides of the base plate located at the lower end of the testing machine main body. The upper clamping block and the lower clamping block are symmetrically distributed, positioning plates are fixedly connected to the two ends of the base plate, and sliding grooves are formed in the two sides of each positioning plate. According to the textile flame-retardant fiber strength detection device, when the end part of a sample is clamped and fixed, one end of the sample firstly passes through the space between the base plate and the upper clamping block, and then the sample passes through the space between the base plate and the other upper clamping block, so that the base plate is wrapped by the sample, and the strength of the flame-retardant fiber is detected by combining the design that the two ends of the base plate are arc-shaped and the diameters are gradually changed; the clamping force is uniformly distributed along the axial direction of the fiber, so that the stress concentration is avoided, the slippage of the sample can be prevented, the intrinsic fracture of a non-material can be reduced, and the detection precision is improved.

The invention discloses a modified chinlon chemical fiber strength detection device based on an intelligent sensor, and relates to the technical field of material science and engineering. Through the arrangement of the detection device, after the two ends of a chinlon chemical fiber are fixed respectively, the chinlon chemical fiber is fixed through a pressing plate and a winding cylinder, and skid resistance is achieved; the chinlon chemical fibers can be kept stable in the detection process, repeated operation caused by sliding is reduced, the detection efficiency is improved, after the chinlon chemical fibers are fixed, the chinlon chemical fibers are placed into the inner wall of the positioning cylinder to be positioned on the upper side and the lower side, otherwise, the chinlon chemical fibers possibly deform or break in the unexpected direction, and the detection accuracy is improved. The strength performance of the chinlon chemical fibers under the normal use condition cannot be truly reflected, after the chinlon chemical fibers on the two sides are fixed, the driving rod rotates to enable the mounting bases on the upper side and the lower side to move back to back, the chinlon chemical fibers are detected, and data are fed back to the control panel in real time through the pressure sensor.

The present application relates to the technical field of cotton fiber detection. A kind of intelligent beam fiber strength tester, including cabinet, industrial computer, sliding table module is provided in cabinet, sectional material frame, air cylinder, beam fiber clamping mechanism, stepper motor, lever type pull rod, force sensor, displacement sensor, resistance detection plate, A / D acquisition conversion module;The application method of the tester, steps include: under normal environmental conditions, beam fiber clamping mechanism clamps fiber sample, obtains moisture regain R by resistance moisture regain conversion program conversion;Stepper motor drives lever type pull rod to stretch sample, data is made into the tensile curve F (e) of beam fiber sample-e by industrial computer, and machine learning model predicts the corrected breaking strength value and elongation rate.The present application is simple and reasonable in structure, can realize the quick and accurate measurement of cotton beam fiber breaking strength value and breaking elongation rate under different humidity conditions in normal environment, is high in informatization degree, economic and practical, and improves the accuracy of test result.

The present invention discloses a method for preparing a C / C-SiC composite material by low-temperature reactive infiltration of a silicon-nickel alloy. The method comprises the following steps: uniformly pressing silicon powder and nickel powder into a mold by mechanical stirring and grinding; heating the pressed block to form a silicon-nickel alloy, and crushing the alloy block into alloy particles; laying a porous C / C composite material on top of the silicon-nickel alloy particles, and reactive infiltration in a vacuum furnace in a vacuum atmosphere or an Ar or N2 inert atmosphere to obtain a C / C-SiC composite material. The silicon-nickel alloy is used to address the limitations of the C / C-SiC composite material prepared by the pure silicon reactive infiltration process, such as low strength, high reactive infiltration temperature, and damage to fiber strength. The present invention has the advantages of significantly reducing the reactive infiltration process temperature, improving the uniformity of SiC phase distribution in the matrix, and improving the mechanical properties of the composite material, such as flexural strength and fracture toughness.

The invention provides a precursor for high-strength and high-modulus polyacrylonitrile carbon fibers as well as a preparation method and application of the precursor, and mainly solves the problems of many pre-oxidized broken filaments and low strength, modulus and elongation of carbon fibers in the prior art. According to the method, wet spinning is adopted, and the method comprises the step of drying and densifying polyacrylonitrile nascent fibers obtained through wet spinning, drying and densifying at least comprise eight hot rollers, and the light transmittance ratio of tows between any two hot rollers to previous adjacent tows is 0.9-2.0. The method can be used for industrial production of the polyacrylonitrile carbon fiber precursor.

This invention relates to the field of textile materials technology, and proposes a fiber for headscarves and its preparation method. The fiber for headscarves comprises the following components by weight: 100 parts PET resin, 2-4 parts modified graphene oxide, 8-10 parts toughening agent, and 0.5-1 parts antioxidant; the modified graphene oxide comprises the following raw materials by weight: 2-5 parts gallic acid fatty ester and 1 part graphene oxide. This technical solution solves the problem of low strength in existing PET fibers for headscarves.

A blended rope is provided having an outer sheath (8) enclosing at least a strength member (7), the strength member (7) having high-strength synthetic fibers, the strength member (7) being a blended strength member (7) formed with a combination of ARAMID fibers and HMPE fibers, the blended strength member comprising a non-homogeneous distribution of the ARAMID and HMPE fibers, wherein the weight ratio of ARAMID to HMPE in the strength member (7) is preferably a minimum of 80:20.

This invention relates to a method for preparing polyacrylonitrile-based high-performance carbon fiber precursor, mainly addressing the problems of high fiber fineness CV value, low strength, and high strength CV value in existing carbon fiber precursors. This invention employs a wet spinning process, using curved rollers in the drying and densification stage. Simultaneously, at 350–450 kPa, the relationship between steam drawing tension and steam drawing ratio satisfies a linear relationship: y = Ax - 50.6 (400 ≤ A ≤ 800, 1 ≤ x ≤ 5). Wherein, y is the steam drawing tension, and x is the steam drawing ratio. The technical solution adopted in this invention effectively solves the problems of high fiber fineness CV value, low strength, and high strength CV value in carbon fiber precursors, and can be used in the industrial production of polyacrylonitrile-based high-performance carbon fiber precursors.

The invention discloses a floating type offshore wind power blade design structure safety evaluation system and method, and belongs to the field of blade structure design. The system comprises an ultimate strength evaluation module and a fatigue strength evaluation module. Wherein the ultimate strength safety evaluation module comprises structural stability evaluation, fiber strength evaluation, inter-fiber strength evaluation, structural adhesive static strength evaluation, local stability evaluation and sandwich material shearing strength evaluation. The fatigue strength safety evaluation module comprises structural adhesive fatigue strength evaluation, equivalent fatigue strain evaluation and fiber fatigue strength evaluation. According to the system, the safety of the blade body structure is comprehensively evaluated by calculating the limit and fatigue strength of the blade glass fabric, the pultrusion plate, the core material and the structural adhesive main material, and safety accidents caused by insufficient design strength of the blade are avoided. Meanwhile, the evaluation system can reduce the workload of structural designers to a great extent and improve the working efficiency.

The application discloses polyester staple fiber for sewing thread and a preparation method thereof. The polyester staple fiber has the following aggregation morphology: the number of crimps is 8-20 per 25 mm, the ratio of the crimp degree to the number of crimps CI / CN is 0.70-1.25, the crimp morphology of the single fiber has the morphology characteristics that the crimp wave peak width is large, and the wave peak arrangement is loose and not close, the crimp wave peak includes a type of wave peak and b type of wave peak, the width w of the a type of wave peak is 2.6-6.0 mm, the width w of the b type of wave peak is 0-2.5 mm, the proportion of the a type of wave peak is 70-100%, and the rest is the b type of wave peak; the mass index of the above fiber meets the physical performance mass index of the existing product, and simultaneously has the characteristics of high carding passability and high fiber strength utilization rate; the fiber can improve the spinnability before the production of the polyester sewing thread, and simultaneously improve the fiber strength utilization rate, and the strength utilization coefficient is increased by 5.0-17.6% compared with the previous one.

The application discloses a sea island cotton chromosome fragment capable of improving fiber strength of upland cotton and application of the sea island cotton chromosome fragment. The application provides a chromosome fragment from sea island cotton, which is a fragment located from InDel molecular marker C6STR-3 to InDel molecular marker C6STR-10 on D06 chromosome of sea island cotton. The nucleotide sequence of the InDel molecular marker C6STR-3 is shown as SEQ ID NO. 3. The nucleotide sequence of the InDel molecular marker C6STR-10 is shown as SEQ ID NO. 6. The sea island cotton chromosome fragment provided by the application can significantly increase fiber strength of upland cotton when applied to cotton molecular breeding. Meanwhile, the InDel molecular marker developed by the application provides a molecular basis for breeding of high-fiber-strength cotton varieties.

The invention relates to the technical field of textile fibers, in particular to a solid kapok viscose fiber and a preparation method thereof. According to the solid kapok viscose fiber provided by the invention, the viscose fiber is modified by adopting active components of kapok, so that the solid kapok viscose fiber with an antibacterial effect is prepared. The solid kapok viscose fiber combines the advantages of the kapok and the viscose fiber, and has the advantages of light weight, good heat retention property, high antibacterial and acarus killing effect, good moisture absorption and quick drying property and strong mechanical property. The solid kapok viscose fiber provided by the invention overcomes the defects of poor antibacterial property, low fiber strength and low stability of common viscose fibers, and the solid kapok viscose fiber is remarkably superior to traditional viscose fibers in functionality, sustainability and application range; wide application prospects are realized in the fields of clothes, home textiles, industrial textiles, filling materials and the like.

The invention discloses a novel modified elastomer foot pad and a preparation method thereof, and the preparation method comprises the following steps: mixing TPE elastomer, polycaprolactone glycol, hexagonal boron nitride and other components, carrying out twin-screw melt extrusion, cooling and pelletizing, then carrying out spinning extrusion on master batches, sequentially carrying out three-section temperature control drafting and heat setting to obtain TPE modified filaments, and carrying out extrusion molding on the TPE modified filaments to obtain the novel modified elastomer foot pad. Then doubling and twisting to obtain modified yarns, compounding the modified yarns with polyester low stretch yarns in proportion, weaving into a three-dimensional honeycomb structure through a warp knitting process, and cutting and forming to obtain the novel modified elastomer foot pad. By introducing multiple functional components into the TPE elastomer, the resilience and shape retention performance of the material can be improved, the interface bonding force can be enhanced in combination with the modified hexagonal boron nitride, the strength and stability of the TPE fiber are improved in cooperation with the master batch pretreatment and multi-section drafting and shaping process, and by means of the three-dimensional honeycomb structure weaving and zoning tension control process, the strength of the TPE fiber is improved. The novel modified elastomer foot pad with excellent buffering performance and durability can be prepared.

The invention discloses a nanoscale dispersed polyester color master batch and a preparation method thereof, the nanoscale dispersed polyester color master batch comprises the following components by mass: 85%-92% of a PET matrix, 8%-15% of a pigment, and a silane coupling agent accounting for 0.1%-5% of the mass of the pigment; the average particle size of the pigment is smaller than or equal to 180 nm, and the epoxy grafting rate of the surface of the pigment is larger than or equal to 90%. The silane coupling agent and the pigment are mixed, so that the hydrophilic polarity of the modified pigment is changed into the hydrophobic non-polarity compatible with PET, and the agglomeration driving force is eliminated; secondly, after the modified pigment and a PET matrix are treated in a high-strength flow field in a combined paddle, the problem of pigment agglomeration is solved, and a color master batch melt with the average pigment particle size smaller than or equal to 180 nm and uniform distribution is obtained through three-stage stretching flow homogenization; the nanoscale dispersed polyester color master batch which is nanoscale dispersed in pigment, uniform in coloring, high in fiber strength and capable of being stably produced is prepared.

The present application belongs to the field of textile dyeing and finishing technology, and provides an antibacterial and shrink-resistant finishing method for wool fiber products based on catalytic grafting and crosslinking, comprising the following steps: dissolving potassium hydroxide in ethanol to prepare an alkali-alcohol solution, immersing the wool fiber product in the alkali-alcohol solution to obtain a pretreated wool fiber product; synthesizing modified amino macromolecules containing disulfide bond side groups by using lipoic acid and amino macromolecules as main raw materials; immersing the pretreated wool fiber product in the modified amino macromolecule aqueous solution, and then immersing it in silver nitrate to obtain an antibacterial and shrink-resistant wool fiber product. The antibacterial and shrink-resistant finishing method forms a modified amino macromolecule crosslinking network layer on the surface of the wool fiber product, does not damage the fiber strength, and gives the wool a shrinkage-resistant effect; the modified amino macromolecule has antibacterial, reducing and coordination combination properties with nano-silver, promotes the reduction and deposition of silver ions on the surface of the wool fiber, and improves the antibacterial effect of the wool fiber product.

The invention relates to the technical field of chemical textile processing, and discloses a polylactic acid / nanocellulose composite fiber dyeing process, which comprises a spinning solution preparation process, a spinning process and a dyeing process, and the spinning solution preparation process comprises the following steps: uniformly mixing a nanocellulose suspension, a polylactic acid solution and an additive, standing at 30-80 DEG C for 1-2 hours, performing high-energy electron beam radiation to form gel, and washing the gel to obtain a hydrogel spinning solution; in the spinning process, the hydrogel spinning solution is fed into wet spinning equipment for spinning to form fibers, the fibers are subjected to high-energy electron beam radiation drying reinforcement to obtain fiber filaments, the irradiation dose is 10-50 kGy, and the irradiation time is 3-5 minutes. The preparation method disclosed by the invention is simple, feasible, green and environment-friendly, the dye uptake of the prepared composite fiber reaches 80%, the strength of the composite fiber is enhanced by 1-2 times, and the fibrillation resistance is improved by 1-2 times.

The invention discloses haplotypes related to cotton fiber strength and functional KASP molecular markers and detection application thereof, and relates to the technical field of plant molecular breeding and genetic markers. The haplotype is located in 5, 980, 849-5, 982 and 917 bp segments of a cotton reference genome D08 chromosome, is composed of seven SNP sites and can be divided into two types of Hap1 and Hap2, the KASP molecular marker is located at 5, 982 and 917 bp positions of the cotton reference genome D08 chromosome, and the basic group is A / T. The haplotype represented by the molecular marker is significantly related to the cotton fiber strength character, and a KASP detection primer developed based on the molecular marker has the advantages of accurate detection, simple operation, high flux, low cost and the like, can be used for screening early materials in cotton breeding, significantly improves the selection efficiency of the fiber strength character, and accelerates the breeding process of a new variety of high-quality cotton.

The invention belongs to the technical field of functional fibers, and particularly relates to a preparation method of skin-care and odor-removing regenerated cellulose fibers. According to the preparation method, a modified functional agent is obtained by generating a polytannic acid thin layer on the surface of a bamboo charcoal adsorbate, so that the dispersity of bamboo charcoal powder particles and the slow release effect on jojoba oil are improved; polytannic acid on the surface of the modifying functional agent and amino in amino modified dimethyl siloxane are subjected to a Michael addition / Schiff base reaction under the weak alkaline condition to form a cross-linked structure, the internal stability of the fiber is improved, meanwhile, the fiber strength and the combination effect of the modifying functional agent and the fiber are improved, and the function durability is higher. The prepared skin-care odor-removing regenerated cellulose fiber has excellent mechanical properties and a good deodorizing effect, the reduction rate of ammonia gas is greater than or equal to 90%, the reduction rate of acetic acid is greater than or equal to 90%, and the reduction rate of isovaleric acid is greater than or equal to 85%.

A method for preparing a melt direct-spun high-viscosity PBAT / low-viscosity PET bicomponent fiber, and a polymerization reactor for high-viscosity PBAT. The method comprises: using two production lines for respectively producing a high-viscosity PBAT melt and a low-viscosity PET melt, and then carrying out spinning. A high-viscosity PBAT production line comprises a first esterification reactor (10), a second esterification reactor (11), a first pre-polymerization reactor (12), a second pre-polymerization reactor (13), and a high-viscosity PBAT polymerization reactor (14). A low-viscosity PET production line comprises a first esterification reactor (10), a second esterification reactor (11), a first pre-polymerization reactor (12), a second pre-polymerization reactor (13), and a low-viscosity PET final polymerization reactor (15). The polymerization reactor (14) comprises disc (9) reaction units in a parallel double-shaft (8) arrangement; and the two shafts (8) rotate in opposite directions, thereby improving the devolatilization effect, achieving self-cleaning, and significantly increasing the viscosity. By using the method, the cost is low, the productivity is high, the process flow is shortened, and the fiber can reach a strength of 2.55-2.85 cN / dtex, a crimp contraction ratio of 25%-60% and a crimp stability of 58%-70%.

The application discloses a kind of silicon carbide fiber bundle liquid phase suspension impregnation device and its interface layer preparation method, belong to ceramic matrix composite interface engineering field.Device includes unwinding mechanism, mechanical pre-twist mechanism, liquid phase impregnation tank, ultrasonic suspension dispersion system, guide assembly, drying unit and winding mechanism.Method by mechanical pre-twist will fiber bundle preliminary flatten into flat strip, again introduced liquid phase impregnation tank, under the action of ultrasonic field make fiber monofilament in liquid contactless suspension state, realize the uniform adsorption and deposition of interface layer precursor.The application utilizes the acoustic streaming field generated by ultrasonic wave in liquid to make fiber monofilament "suspended" in liquid, completely avoid the hard contact damage of fiber and mechanical parts, and solve the problem of uneven impregnation of each monofilament in fiber bundle.The thickness variation coefficient of interface layer obtained by the application is ≤5%, and the fiber strength retention rate is ≥95%, which is suitable for continuous and high-quality preparation of various interface layers such as carbon, BN, SiC and oxide on the surface of silicon carbide fiber.

This invention discloses a carbon fiber double-double layup method for a composite material fuselage stringer structure. The stringer is fixed to the inside of the aircraft fuselage cylinder and adopts a carbon fiber double-double layup structure. First, the two angle parameters φ and ψ of the double-double layup are set within the range of 0º-180º and different combinations are made. Then, under a preset bending moment and a preset number of layers, the optimal combination of angle parameters (±φ, ±ψ) is determined by strength calculation. Finally, the double-double layup is repeated in a fixed cycle along the stacking direction according to the determined combination of angle parameters (±φ, ±ψ). This invention can improve the design stiffness and strength of the stringer with the same material usage, or reduce the amount of composite material used with the same stiffness or strength, resulting in high carbon fiber strength utilization and high material utilization rate.