160 results about "Fiber drawing" patented technology

The utility model belongs to the technical field of glass fiber wire drawing machines, and particularly relates to a rear-end disc type wire drawing machine head capable of automatically adjusting and avoiding a wire drawing resonance area on line. The device comprises a machine head main shaft, a bearing seat, a cylinder body, a piston, a front seat, a rear seat, a barrel replacing body and a vibration reduction component, when the machine head operates, the bearing seat, the cylinder body, the piston, the front seat, the rear seat, the barrel replacing body and the vibration reduction component form an online rigid adjusting mechanism for the soft support of the machine head. The vibration of the machine head can be detected in real time through the vibration sensor and fed back to the PLC for control, the gas flow and / or the gas pressure are / is adjusted through the proportional valve PID, online real-time data collection and exchange are achieved, dynamic closed-loop control over the machine head rigidity adjusting mechanism on the bearing seat is achieved, and the vibration of the machine head is controlled within an acceptable range all the time.

The utility model belongs to the technical field of glass fiber wire drawing machines, and particularly relates to a wire drawing machine head with an inward taper, which can automatically adjust and avoid a wire drawing resonance area on line. The device comprises a machine head main shaft, a bearing seat, a front seat, a rear seat, a front taper sleeve, a rear taper sleeve and a vibration reduction component, the front taper sleeve and the rear taper sleeve are both arranged on the bearing seat, and the conical surfaces are matched with the front conical part and the rear conical part respectively; the front seat is arranged on the bearing seat, and a front sealing cavity is formed between the front seat and the front taper sleeve; the rear seat is arranged on the bearing seat, and a rear sealing cavity is formed between the rear seat and the rear taper sleeve; the front and rear sealing cavities are respectively provided with front and rear inflation ports. PLC control can be fed back through machine head vibration real-time detection, proportional valve PID adjustment is adopted, online real-time data collection and exchange are achieved, a soft supporting vibration reduction device on a bearing seat is controlled, and vibration is controlled within an acceptable range.

The invention belongs to the technical field of optical fiber manufacturing, and discloses a self-marking type anti-resonance hollow-core optical fiber and a preparation method thereof. The self-marking type anti-resonance hollow-core optical fiber comprises a cladding sleeve, a cladding anti-resonance group and a self-marking unit, the cladding anti-resonance group is fixed on the inner wall of the cladding sleeve; the self-marking unit is positioned in the cladding sleeve, so that at least one cladding anti-resonance group is distinguished from other cladding anti-resonance groups; and a central region defined by the cladding anti-resonance group is a fiber core. According to the self-marking type anti-resonance hollow-core optical fiber, the cladding anti-resonance group in the anti-resonance hollow-core optical fiber can be quickly identified in the wire drawing process, the size of the cladding anti-resonance group can be conveniently regulated and controlled on line, and the transmission performance of the anti-resonance hollow-core optical fiber is not influenced.

The utility model belongs to the technical field of glass fiber drawing machines, and particularly relates to a drawing machine head with an outward taper, which can automatically adjust and avoid a drawing resonance area on line. The device comprises a machine head main shaft, a bearing seat, a front taper sleeve, a rear taper sleeve, a barrel replacing body, a sealing cavity and an inflation inlet, the taper of the front taper sleeve and the taper of the rear taper sleeve face outwards, and the conical surfaces of the front taper sleeve and the rear taper sleeve are opposite. When the machine head of the wire drawing machine operates, real-time detection and feedback of PLC control can be realized through the machine head vibration sensor, and PID adjustment of the proportional valve is adopted, so that online real-time data acquisition and exchange are realized, a soft support vibration reduction device on a bearing seat is controlled, vibration of the machine head is automatically controlled within a suitable range, and online closed-loop real-time adjustment of rigidity of the machine head is realized.

The invention discloses a basalt fiber wiredrawing control method, system, equipment and medium, and relates to the technical field of control systems.The basalt fiber wiredrawing control method comprises the steps that a preset time period is set, a current moment and a historical moment are obtained, a historical wiredrawing diameter data sequence is obtained, and a stability index is obtained; if the stability index exceeds a preset threshold value, a historical melt viscosity data sequence is obtained, the viscosity change direction is obtained, and the wire drawing diameter change direction is obtained; if the diameter change direction is decreased, the minimum viscosity value is obtained, a first pretreatment reference viscosity value is formed, the viscosity value of the to-be-monitored melt is obtained, and if the viscosity value of the to-be-monitored melt is smaller than the first pretreatment reference viscosity value, the temperature of the bushing plate is decreased; if the diameter change direction is increased, the maximum viscosity value is obtained, a second pretreatment reference viscosity value is formed, the viscosity value of the to-be-monitored melt is obtained, and if the viscosity value of the to-be-monitored melt is larger than the second pretreatment reference viscosity value, the temperature of the bushing plate is increased. The device has the advantages that the wire drawing quality is improved, the energy efficiency is optimized, and the control is accurate.

The invention discloses a basalt fiber wiredrawing adjusting method, system, equipment and medium, and relates to the technical field of basalt fiber wiredrawing control, and the basalt fiber wiredrawing adjusting method comprises the following steps: obtaining melt viscosity in a pouring furnace; judging whether the melt viscosity is within the range of a preset viscosity threshold value or not, if yes, returning to obtain the melt viscosity in the pouring furnace, and if not, continuously obtaining a plurality of wire drawing state images of the basalt fiber in unit time; according to the multiple wire drawing state images, whether wire drawing abnormal characteristics exist or not is recognized, if not, the operation is returned to the step of obtaining the melt viscosity in the pouring furnace, and if yes, a first temperature adjusting parameter is obtained; wherein the first temperature adjusting parameter is used for adjusting the melt temperature in the pouring furnace; the first temperature adjusting parameter is input into the viscosity-temperature initial curve of the wire drawing process so as to update and obtain the viscosity-temperature target curve, and the method has the advantages that self-adaptive adjustment can be achieved, and the adjusting efficiency is improved.

The invention provides a fiber drawing temperature control system for low-dielectric glass fibers, relates to the technical field of fiber drawing temperature control, and aims at monitoring the temperature of each area of a fiber bushing in the preparation process of the low-dielectric glass fibers in real time. Generating a temperature change curve of each area in the fiber bushing through the monitored temperature data, extracting temperature variation characteristics of each area in the corresponding temperature change curve, and constructing a temperature variation trend chart of the fiber bushing based on the temperature variation characteristics of each area; obtaining a theoretical temperature distribution diagram of fiber drawing in the preparation process of the low-dielectric glass fiber, and determining a regional temperature regulation and control sequence of the fiber bushing according to the temperature variation trend diagram and the theoretical temperature distribution diagram; according to the application, the wire drawing temperature of the fiber bushing can be accurately regulated and controlled in the fiber wire drawing process, so that the production quality of the low-dielectric glass fiber is improved.

This invention discloses a method for preparing high rare-earth-doped low-loss boron-containing glass optical fibers. The steps are as follows: weigh glass raw materials containing rare-earth oxides and boron oxide, mix them uniformly, and place them in a high-temperature furnace. First, heat the mixture under a high-purity nitrogen atmosphere, then switch to a high-purity oxygen atmosphere or a high-purity air atmosphere for continued heating. The resulting glass melt is cooled and annealed to obtain a large glass block. The glass is then processed into a preform and placed in an optical fiber drawing furnace for fiber drawing under a high-purity oxygen atmosphere, thus achieving the preparation of high rare-earth-doped low-loss glass optical fibers. This invention eliminates the additional glass matrix absorption in the near-infrared region caused by boron in boron-containing glass optical fibers and also transforms the transition metal impurity ions from a low valence state with broad absorption in the near-infrared region to a high valence state with narrow low absorption in the near-infrared region. Both of these aspects significantly reduce the matrix absorption of boron-containing glass optical fibers, providing possibilities for the application of high rare-earth-doped low-loss glass optical fibers.

The invention provides a method for controlling an impregnating compound on the outer layer of a spinning cake in a glass fiber drawing process, which comprises the following steps of: drawing glass fibers, and forming an impregnating compound on the surface of the glass fibers at a constant first linear speed in the first stage of drawing, reducing the first linear speed to a second linear speed in a second stage of wire drawing to form an impregnating compound on the surface of the glass fiber, and then forming the impregnating compound on the surface of the glass fiber at a constant second linear speed in a third stage of wire drawing until a cylinder is full; in the second stage of wire drawing, the number N of times of reduction of the linear speed from the first linear speed to the second linear speed is larger than or equal to 1. According to the control method provided by the invention, wiredrawing oil coating is directly reduced by adopting a mode of abruptly reducing the linear speed of the impregnating compound, so that the coating efficiency of the impregnating compound is improved, the outward retreating amount of yarns with the oil content exceeding the standard is reduced, minimum or zero outward retreating can be realized on an impregnating compound layer, and the quality of glass fibers can be effectively improved.

Lignin pellets comprising fused lignin are described herein. The lignin pellets may further comprise a processing aid, and / or a surfactant, and / or a chemical modifying agent, and / or a compatibilizer and / or a thermoplastic polymer. An extrusion process for producing the lignin pellets and their use in the manufacture of lignin thermoplastic blend products, polyols, polyphenols, polyaromatics and polyurethanes is also disclosed herein. The extruded lignin pellet may be dry-blended with additional thermoplastic and / or additive and then directly processed using processes such as injection molding, compression molding, extrusion, extrusion coating, blowing, thermoforming, stamping, foaming, fiber drawing, calendering or rolling.

The invention relates to an optical fiber drawing method integrated with a coloring function and a production system, and relates to the technical field of optical fiber manufacturing, and the method comprises the following steps: melting and drawing an optical fiber preform to form a bare fiber; the bare fiber is cooled; coating the cooled bare fiber twice to form an inner coating and an outer coating; performing primary UV curing on the inner coating and the outer coating to enable the outer coating to reach a semi-cured state; coating coloring ink on the surface of the outer coating in a semi-cured state; performing secondary UV curing on the coloring ink, so that the coloring ink is cured, and the inner coating and the outer coating are finally cured; and the cured optical fiber is detected and taken up. The coloring procedure is integrated into the wire drawing process, integrated continuous production is achieved, and optical fiber microbend loss caused by multiple times of winding and unwinding is avoided; by means of molecular activity in a semi-cured state, coloring ink permeates to form an interpenetrating network structure, and adhesive force is improved.

The application relates to a fiber panel for cultural and creative products and a preparation method and application thereof. The fiber panel comprises a plurality of optical fibers arranged in an array, the optical fiber comprises a core and a cladding layer; the core has a refractive index of 1.66-1.68; the cladding layer is coated outside the core; the cladding layer has a refractive index of 1.50-1.52, and the expansion coefficient of the cladding layer is 2-5*10 ‑7 (1 / DEG C) lower than that of the core; the method comprises the following steps: taking a glass rod with a refractive index of 1.66-1.68 as core material, nesting a glass tube with an expansion coefficient of 2-5*10 ‑7 (1 / DEG C) lower than that of the core material and matching the diameter of the core material rod as sheath material, hot melting to obtain a preform rod; performing fiber drawing and arrangement on the preform rod to obtain a multifilament rod; and performing bundling, plate drawing, mechanical processing and optical processing on the multifilament rod to obtain the fiber panel. The technical problem to be solved is to make the fiber panel free of dark spot defects with a diameter of 150 microns or above, free of chicken wire defects with a length of more than 2 mm, shear distortion less than or equal to 100 microns, snake distortion less than or equal to 100 microns, and image displacement less than or equal to 280 microns.

The utility model discloses an optical fiber drawing coating die through hole tool, which comprises a die through hole guider through hole needle and a die, the top of the small end of the die through hole guider is provided with a through hole needle precise through hole, and the through hole needle is in precise sliding fit with the through hole needle precise through hole of the die through hole guider. The die is installed through an inner hole at the large end of the die through hole guider, is in precise sliding fit with the inner hole and is provided with a positioning structure, so that accurate and stable installation is ensured, a through hole needle is inserted through a through hole needle precise through hole at the top of the small end of the die through hole guider, is in precise sliding fit with the guider and is assisted by a needle hole guide sleeve, and die orifice optical fibers can be automatically and accurately aligned; the alignment accuracy and the knocking fixity are improved, the production efficiency is improved, meanwhile, the accurate positioning structure prevents the die orifice from being damaged due to alignment deviation and knocking deviation, the elastic buffer structure prevents the through hole from damaging the die, the die damage risk is greatly reduced, the die loss is reduced, the production cost is saved, and considerable economic benefits are created for optical fiber production enterprises.

The application discloses a kind of carbon nanotube fiber drawing enhancement method and system.The drawing enhancement method includes: providing carbon nanotube fiber, carbon nanotube fiber is twisted state;Carbon nanotube fiber is cabled and is treated, and fiber bundle is obtained;Protonation drawing and coagulation bath treatment are carried out to fiber bundle, and precursor fiber is obtained;Protonation reagent and / or coagulation bath reagent in precursor fiber are removed, and carbon nanotube reinforced fiber is obtained.The drawing enhancement method provided by the application is twisted and is cabled and is treated, after the internal each expansion fiber edge shape of fiber bundle is expanded by strong acid protonation, adaptive effect is generated;During drawing process, make stress more evenly be applied on each fiber, improve the stability in the process of fiber drawing, to realize higher drawing rate and drawing rate, finally significantly improve the mechanical strength and consistency of reinforced fiber, and bring very excellent continuity, very beneficial to the application of carbon nanotube fiber.

The utility model relates to the technical field of textile instruments, in particular to a drafting device of a wool type fiber drawing frame, which is characterized in that when wool type fibers pass through a leather roller, a drafting roller and a pull-out roller of a drawing frame body to be drafted and pulled out, an electrostatic elimination component is started to increase the air humidity in the drawing frame body, and the conductive characteristic of water molecules is utilized to eliminate the static electricity in the drawing frame body. Water molecules in the air are combined with static charges on the surfaces of the wool-type fibers, so that static electricity is neutralized, the influence of the static electricity is reduced, and the influence of the static electricity on wool-type fiber processing is reduced; comprising a drawing frame body, a leather roller, a drafting roller and a pull-out roller, the leather roller, the drafting roller and the pull-out roller which are used for wool type fiber drawing and drafting are sequentially installed on the inner wall of the drawing frame body, the drawing frame further comprises a static electricity eliminating assembly, and the static electricity eliminating assembly is installed on the drawing frame body.

The utility model discloses a drawing device for hollow polyester staple fiber research and development, which comprises a fixed base, the top of the fixed base is respectively provided with a first winding device, a second winding device and a third winding device from one end to the other end, and two first guide frames are arranged between the first winding device and the second winding device. A heater is arranged between the two first guide frames, a heating bin is arranged at the top of the heater, a heating electric wire is arranged in the heating bin, two second guide frames are arranged between the second winding device and the third winding device, and a cooler is arranged between the two second guide frames. According to the device, heating work is conveniently carried out when hollow polyester staple fibers are drawn, so that the drawing efficiency is improved, the problem of low drawing speed is solved, rapid cooling is conveniently carried out after drawing, subsequent secondary processing is solved, and the processing convenience is improved.

The utility model belongs to the technical field of wire drawing machines, and discloses a rotary telescopic yarn shifting mechanism for a glass fiber wire drawing machine, which comprises a supporting arm arranged on the wire drawing machine, a supporting plate is arranged at one end of the supporting arm far away from the wire drawing machine, a plurality of sliding frames are horizontally arranged on the supporting plate at intervals, and each sliding frame comprises a sliding plate; rotating shafts penetrating through the surface of the mounting plate are rotationally arranged at the upper end and the lower end of the mounting plate, pulleys are arranged at the ends, away from the supporting plate, of the rotating shafts, belt wheels are arranged at the ends, close to the supporting plate, of the rotating shafts, and the two belt wheels are connected through a synchronous belt; a worm wheel is arranged at the end, close to the supporting plate, of the rotating shaft at the upper end of the mounting plate, and a first driving assembly for driving the worm wheel to rotate is arranged on the supporting plate. During wire drawing, the pulley actively rotates, so that the tension of yarns in the wire drawing process is reduced, the abrasion of the pulley is relieved, the service life of the pulley is prolonged, and the production cost and the labor intensity of workers are reduced.

The utility model belongs to the technical field of wire drawing machines, and discloses a novel driving mechanism direct yarn glass fiber wire drawing machine which comprises a rack, a main shaft impeller mechanism, a turnover mechanism, a transverse moving mechanism, a wire arranging mechanism and a wire blocking mechanism, a base plate is arranged on the rack, and the turnover mechanism comprises a rotating disc and an arc-shaped motor which are rotationally arranged on the base plate; the transverse moving mechanism comprises a fixing plate, two transverse sliding rails are arranged on the fixing plate in a spaced mode, a transverse moving supporting plate is arranged on the two sliding rails in a sliding mode, a transverse moving shaft and a connecting shaft are arranged at the upper end and the lower end of the transverse moving supporting plate correspondingly, and supporting arms are connected to the ends, away from the transverse moving supporting plate, of the transverse moving shaft and the connecting shaft; the wire arranging mechanism is arranged on the side, away from the transverse moving supporting plate, of the upper end of the supporting arm. The transverse moving mechanism drives the wire arranging mechanism to transversely move through the transverse moving linear motor and the sliding rail, the wire arranging mechanism drives the shuttle to reciprocate through the wire arranging linear motor, and the driving mechanism is simple, accurate in positioning, safe and reliable.

The present invention discloses a basalt fiber drawing control method, system, equipment and medium, which relates to the technical field of control systems, including: setting a preset time period, obtaining the current moment and historical moments, obtaining a historical drawing diameter data sequence, and obtaining a stability index; if the stability index exceeds a preset threshold, obtaining a historical melt viscosity data sequence, obtaining the viscosity change direction, and obtaining the drawing diameter change direction; if the diameter change direction is decreasing, obtaining a minimum viscosity value, forming a first pretreatment reference viscosity value, obtaining a melt viscosity value to be monitored, and if the melt viscosity value to be monitored is less than the first pretreatment reference viscosity value, reducing the temperature of the leak plate; if the diameter change direction is increasing, obtaining a maximum viscosity value, forming a second pretreatment reference viscosity value, obtaining a melt viscosity value to be monitored, and if the melt viscosity value to be monitored is greater than the second pretreatment reference viscosity value, increasing the temperature of the leak plate. The present invention has the advantages of improving drawing quality, optimizing energy efficiency and precise control.

An optical fiber includes a glass structure to guide light along a longitudinal axis of the optical fiber, and an amorphous coating disposed on and surrounding the glass structure. The amorphous coating includes at least one fluorinated polyimide. A repeating unit each fluorinated polyimide includes two imide groups and at least one fluorinated aliphatic spacer group. Each imide group is attached to a terminus of a fluorinated aromatic group. The amorphous coating has a low refractive index, high-temperature stability, and low optical absorption, making the optical fiber suitable for high-power applications subject to high temperatures. The amorphous quality of the coating is compatible with fiber drawing and provides the necessary mechanical strength for the optical fiber when in use.

The utility model provides an optical fiber preform rod on-line collimation monitoring and automatic correction device which comprises a tower, a translation device and a chuck clamp are arranged at the upper end of the tower, the chuck clamp is used for clamping an optical fiber preform rod, the translation device is used for adjusting the horizontal position of the chuck clamp, and a fiber drawing furnace is arranged below the chuck clamp. A sensor mounting plate is arranged at an upper end opening of the wire drawing furnace, a through hole is formed in the center of the sensor mounting plate, an X-direction position sensor and a Y-direction position sensor which are aligned to the center of the through hole of the sensor mounting plate are arranged on the sensor mounting plate, and the detection direction of the X-direction position sensor is perpendicular to that of the Y-direction position sensor. And the problem of collimation deviation of the preform during optical fiber drawing is solved.

This application belongs to the technical field of glass fiber drawing machines, specifically relating to a drawing machine head capable of automatically adjusting online to avoid the resonance zone during fiber drawing, and its control method. It includes three solutions: face-to-face tapered inward adjustment, back-to-back tapered outward adjustment, and a rear-end disc pneumatic mechanism. The face-to-face tapered inward adjustment solution uses bidirectional air inflation of the front and rear cone sleeves to press the vibration damping components inward; the back-to-back tapered outward adjustment solution forms a sealed cavity between the front and rear cone sleeves, and uses single-path air inflation in the middle to push the two cone sleeves outward against the symmetrically arranged, stepped vibration damping components; the rear-end disc pneumatic mechanism arranges vibration damping components on the circumference of the bearing seat, and adjusts the resonance range through air inflation using a rear-end disc clamping device. The drawing machine head and its control method disclosed in this application, capable of automatically adjusting online to avoid the resonance zone during fiber drawing, can achieve automated closed-loop adjustment of the machine head rigidity using vibration sensors, electronic control systems, and other components or assemblies, thus achieving the technical effect of flexibly avoiding the resonance zone during fiber drawing.

The utility model belongs to the technical field of glass fiber production equipment, and particularly relates to a clip type automatic feeding mechanism for an automatic sleeve of a wire drawing machine. The cylinder feeding device comprises a lifting feeding set, a first-stage cylinder feeding mechanism and a second-stage cylinder feeding mechanism. The lifting feeding set is used for completing pressure maintaining lifting progressive feeding of the folding wire winding barrels, the first-stage barrel feeding mechanism is used for horizontally moving the folding wire winding barrels from the lifting feeding set to the second-stage barrel feeding mechanism, and the second-stage barrel feeding mechanism is used for opening the opening portions of the folding wire winding barrels and feeding the folding wire winding barrels forwards. According to the clip type automatic feeding mechanism for the automatic sleeve of the wire drawing machine, a plurality of wire winding barrels can be carried, and automatic feeding of the wire winding barrels can be achieved through cooperation of the lifting feeding set, the first-stage barrel feeding mechanism and the second-stage barrel feeding mechanism; and the automatic cylinder feeding efficiency can be effectively improved through synchronous or crossed implementation of a plurality of cylinder feeding procedures.

A method for manufacturing an HCF preform is described in which preform blanks (stacks) are subjected to hot forming process steps in order to obtain a preform. After the hot forming process steps, the preforms are cut by means of an annular saw cut method according to the invention such that their end faces have desirable properties for fiber drawing.

The utility model discloses a wire drawing machine for glass fiber production, which relates to the technical field of glass fiber production, and comprises a device body, one side of the device body is provided with a wind-up roll, one side of the device body is rotatably connected with a two-way screw rod, the outer side of the two-way screw rod is provided with external threads which are arranged in a mirror symmetry manner, and the two-way screw rod is provided with a screw rod. The wire drawing machine for glass fiber production comprises a device body, a two-way screw is arranged in the device body, two outer threads of the two-way screw are sleeved with two sliding blocks in a threaded mode, the two sliding blocks are arranged on the two outer threads of the two-way screw in a threaded mode respectively, and the sliding blocks are slidably connected with the side wall of the device body. The structure is simple to operate and convenient to use, a large number of fixing structures such as screws do not need to be used, and therefore the disassembly and assembly convenience of the winding roller of the wire drawing machine for glass fiber production can be effectively improved.

The invention relates to the technical field of optical fiber manufacturing, in particular to an optical fiber core diameter accurate control preparation method which comprises the following steps: step 1, providing an optical fiber preform; 2, heating the optical fiber preform to a softening temperature; step 3, carrying out wire drawing on the heated optical fiber preform through a wire drawing device; 4, in the wire drawing process, measuring the core diameter of the optical fiber in real time by using an optical measurement system; 5, comparing the core diameter measurement value with a preset target core diameter value, and calculating a core diameter deviation value; 6, dynamically adjusting wire drawing parameters through a control algorithm; and 7, repeating the step 4 to the step 6, and continuously performing real-time measurement, comparison and adjustment in the whole wire drawing process until the wire drawing process is finished. Manual intervention is replaced by an automatic control system, introduction of personal errors is reduced, and the stability and consistency of the optical fiber preparation process are improved.

The utility model discloses glass fiber drawing equipment, which relates to the technical field of glass fiber drawing, and comprises a fixed frame and a drawing roller, both sides of the drawing roller are provided with cross shafts, the surfaces of the two cross shafts are provided with hexagonal columns, the top of the fixed frame is symmetrically provided with two support rods, and the two support rods are connected with the cross shafts. The fixing frame is provided with an adjusting mechanism used for adjusting the position distance, the top of the fixing frame is provided with a rotating mechanism used for driving the wire drawing roller to rotate, the rotating mechanism is arranged on the adjusting mechanism, and the hexagonal column is arranged on the rotating mechanism. The adjusting mechanism comprises a two-way screw, the two-way screw is rotationally installed in the fixing frame, and two adjusting plates are installed on the outer wall of the two-way screw in a threaded mode, so that the wire drawing roller is convenient to install and replace, the wire drawing roller is stable in installation, deviation and shaking caused by rotation are avoided, operation is easy, and practicability is high.

The present invention provides a C80 steel fiber mass concrete and a preparation method thereof, and relates to the technical field of building materials, the concrete comprises 500-620 kg of a cementing material, 145-170 kg of water, 650-820 kg of a fine aggregate, 980-1180 kg of a coarse aggregate, and 0.9-1.4% by volume of a functionalized steel fiber. The temperature response composite microcapsule is immobilized on the surface of the functionalized steel fiber in a point-shaped or interval strip-shaped mode, the microcapsule comprises a phase change heat absorption core material, a temperature gating layer, a crack triggering liquid release module and an alkali-resisting shell, and a retarding component is controlled to release when the temperature exceeds a threshold value. And the internal curing liquid and the nucleation densification promoting component are released at a fixed point under the action of crack-induced fiber drawing or shearing. Hydration heat regulation and control and crack self-repairing functions are integrated into a steel fiber reinforced system, so that hydration heat self-feedback inhibition, crack fixed-point internal curing and interface re-densification are realized, and the risks of temperature cracks and self-shrinkage cracks of mass concrete are remarkably reduced while the high-strength performance is maintained.

A preform for multicore optical fiber is described. The preform includes an assembly of core canes arranged in a desired configuration. The core canes are placed in mutual contact with each other to define a series of contact zones between contacting pairs of core canes. The core canes are fused at selected locations within the contact zones to secure the core canes to form a preform from which a multicore optical fiber can be formed. The preform maintains good alignment of core canes and minimizes deformation of core canes during the fiber draw process. Multicore fibers having excellent uniformity in core diameter are produced from the preforms in conventional fiber draw processes.

This application provides a flexible production line capable of producing multi-grammage PET filament composite materials, relating to the field of nonwoven fabric production equipment technology. The production line includes, in sequence, a raw material processing unit, a mixing unit, a screw melt extrusion unit, a filtration unit, a metering extrusion unit, a drawing and filament forming unit, a hot air preheating unit, and a path switching mechanism for switchable high-grammage and low-grammage paths. The high-grammage path includes a cross-laying unit, a needle-punching composite unit, a slicing unit, and a hot-pressing unit, while the low-grammage path includes a hot-rolling unit and a winding and slitting unit. The drawing and filament forming unit employs a three-section fiber drawing machine (upper, middle, and lower), with a 30°–45° deflected airflow introduced in the middle section. This application achieves flexible switching between high-grammage and low-grammage products through the path switching mechanism, enabling the production of PET filament composite materials ranging from 9 g / m² to 2600 g / m² on the same production line, suitable for applications such as automotive sound insulation materials and filter materials.