278 results about "Fiber breakage" patented technology

Embodiments of the invention include an active optical cable and method for controlling the operation of the active optical cable based on the detection of signal loss, e.g., due to fiber breakage, within the active optical cable. The active optical cable includes first and second optical transceivers, each with an open fiber control module coupled between the transmission side and the receiver side of the respective optical transceiver. The transmission side of each optical transceiver is coupled to the receiver side of the other optical transceiver via a plurality of transmission channels, such as a plurality of optical fibers. Each open fiber control module is configured to detect an optical power level of an optical signal received by the receiver side of the optical transceiver within which the open fiber control module resides and, based on such detection, control the operation of the corresponding transmission side of the optical transceiver.

The invention provides an amidoxime-based chelate polyacrylonitrile fiber and its preparation method. The preparation method of the amidoxime-based chelate polyacrylonitrile fiber comprises the following steps that 1, polyacrylonitrile fibers are subjected to irradiation cross-linking under the conditions of an inert gas atmosphere and an irradiation amount of 20 to 2000kGy; and 2, the polyacrylonitrile fibers subjected to irradiation cross-linking undergo an amidoximation reaction. The invention also provides a use of the amidoxime-based chelate polyacrylonitrile fiber as a metal ion adsorption material. Through the preparation method which is simple relatively, the amidoxime-based chelate polyacrylonitrile fiber which has good mechanical properties, high fiber breaking strength, a long reuse life and stable performances and is damaged difficultly is obtained. The amidoxime-based chelate polyacrylonitrile fiber can be utilized as a metal ion adsorption material, is suitable for the fields of purification of industrial waste water or slag, or extraction of uranium of seawater, has excellent effects of adsorbing multiple metal ions, and can greatly reduce an industrial cost.

Inorganic salts are generated in the production process of metal salts, such as sulfonates, sulfates and phosphates. When such metal salts containing inorganic salts are added as an antistatic agent to a polymer for producing polyurethane fiber, the inorganic salts cause fiber breakage or pack choking in fiber extrusion process. In addition, such antistatic agents are highly hygroscopic and contain trace of water. When such an antistatic agent is added to the material for polymerizing polyurethane, the alcohol and water in the agent react with isocyanate to result in lowered degree of polymerization and generation of oligomer. Such polyurethane polymer is spun into fiber of low elongation and tenacity. The material for polyurethane elastic fibers of the present invention comprises a mixture of 5 to 95 weight percent of at least one of the above-mentioned antistatic agents and 95 to 5 weight percent of a isocyanate-free starting material for elastic fibers, and eliminates the above troubles.

An ultra-fine fiber melt-blown nonwoven fabric having excellent fine-particle trapping characteristics and air permeability is obtained by a melt-blowing method using: a die (1) having a plurality of ultra-fine spinning nozzles and an air nozzle; a rotating suction roll (2) having a porous outer peripheral surface and which sucks from the inside thereof; and a pair of upper and lower suction hoods (3a, 3b) covering the suction roll (2). In said melt-blow method: the interval between the die (1) and the suction roll (2) is set such that polymer fiber breakage or twisting is suppressed, within a range wherein the stretching of a molten polymer is completed and vibration of the obtained polymer fiber substantially does not occur; and the intervals between the outer peripheral surface of the suction roll (2) and the die-side end section of suction hoods (3a, 3b) are set such that fibers that have broken and attached or fused to the surface of the melt-blown nonwoven fabric can be removed by suction.

The invention discloses an external pressure-type hollow fiber membrane module with antipollution structure and a system and a method for cleaning, the external pressure-type hollow fiber membrane module comprises a water producing pipe, a raw water pipe, a central water distribution pipe, a central water distribution hole, a U-shaped membrane fiber, a membrane casing, an aeration device, a gas intake pipe, a concentrated water pipe and a pollutant-enriched region, wherein the U-shaped membrane fiber is vertically cast at an upper end of the membrane casing in the shape of hanging naturally, an lower end of a U-shaped membrane module is provided with a gas distribution system, below which the pollutant-enriched region is arranged. The external pressure-type hollow fiber membrane module has the advantages: 1, membrane pollution can be effectively controlled so as to maintain the membrane at higher flux and cleaning can be performed timely during pollution to rapidly recover membrane flux; 2, the possibility of fiber breakage can be reduced due to non-tensioned membrane fiber and adequate shake of aeration; and 3, the V-shaped pollutant-enriched region without any component is arranged below the aeration device, thus no resistance is applied to the lower portion of the membrane fiber during washing and the washing water can speed up the discharging of pollutants.

The invention relates to a method for predicating a stress-strain behavior of a composite, in particular to a method for predicating the stress-strain behavior under arbitrary loading and unloading of a one-way ceramic matrix composite. The invention aims at overcoming the defects of the prior art to provide the method capable of quickly predicating the stress-strain behavior under arbitrary loading and unloading of the one-way ceramic matrix composite. The invention provides the method for predicating the stress-strain behavior under arbitrary loading and unloading of the one-way ceramic matrix composite, and considers failure mechanisms, such as matrix cracking, fiber breakage, interface slip and interface abrasion. Generation and coverage rules for forward and reverse slip regions are provided, and the stress distribution and the strain are given in the presence of any number of forward and reverse slip regions. Most of formulas given by the method have analytical solutions, so that the stress-strain behavior under arbitrary loading and unloading of the one-way ceramic matrix composite can be quickly predicated.

An assembly of potted filtering hollow fiber membranes has at least one bundle of permeating hollow fiber membranes that is potted in a block of potting material, and a cushioning wall extending along at least a portion of the axial length of the membranes adjacent the potting material and around at least a portion of the perimeter of the bundle. The cushioning wall can have a fixed edge adjacent the resin, and the wall can extend away from the resin in a direction generally parallel to the axis of the hollow fiber membranes. Walls of various structures including soft solid materials, non-permeating membranes and fabrics are described.

The invention relates to a preparation method of cellulose acetate fiber, in particular relates to a method for preparing cellulose acetate fiber after the cellulose acetate fiber is plasticized and modified by taking ionic liquid as a plasticizer. The method comprises the following steps of (1) evenly mixing and extruding the cellulose acetate fiber and the ionic liquid; (2) conducting vacuum drying on spinning materials; (3) conducting melt spinning: spinning the spinning materials through a metering pump and a spin sprayed plate, stretching through a hot roll, extracting liquor and washing; and (4) conducting oiling, drying and winding procedures to obtain cellulose acetate fiber with fiber breakage strength of 2.2-6cN/dtex. By adopting the preparation method of cellulose acetate fiber, the problems that the fiber mechanical property is poor, the breakage strength is low, and due to seeping or volatilization of the plasticizer, high fragility of cellulose acetate fiber grafted copolymer and difficulty of processing in the process of plasticizing and melt spinning cellulose acetate fiber, the fiber fineness is larger and the strength is low, and the like in the dry spinning process of cellulose acetate fiber in the prior art can be solved.

The invention discloses a processing method for refining a jute fiber, which comprises adopting sodium hydroxide solution to perform chemical degumming on raw jute after water bath or acid bath is carried out to the raw jute, adopting pectinase or laccase to perform biological enzyme degumming, and performing chemical degumming after physical refining is carried out to the jute fiber where a softening agent is sprayed. Damage to the fiber is reduced by adding the softening agent, the fineness is remarkably improved, the softening agent which is sprayed to the jute fiber prior to the physical refining of the jute fiber can reduce friction between the jute fibers, unnecessary fiber breakage is reduced when the physical refining is performed, the fact that the fiber is not damaged is guaranteed, the fiber strength is prevented from being lowered, part of colloid and impurity are exposed out of a surface layer of the fiber due to split separation of the jute fiber after physical refining, the colloid and impurity on the surface layer of the fiber can be removed through chemical degumming treatment after physical refining, the fiber can be further refined, the costs are reduced, and utilizing rate is improved.

The invention relates to a washing method for a spinneret plate, and mainly solves the technical problems in the prior art that the spinneret plate cannot be cleanly washed, gel is adhered to the surface of the spinneret plate, a spinning solution at the outlet of a spinneret hole overflows, and polyacrylonitrile protofilament has more broken filaments and more thin filaments and is high in fiber breakage rate. The washing method for the spinneret plate comprises the following steps of disassembling the spinneret plate from a spinning assembly; immersing the spinneret plate in a solvent in a container; then immersing the container in water bath; washing by adopting a mode of combining temperature rising with ultrasound; taking out the spinneret plate after the washing is completed; blowing the surface of the spinneret plate by gas which is precisely filtered after the spinneret plate is dried; completing the washing. According to the technical scheme, the problems are well solved, and the washing method can be used in a device washing process after the spinning of the polyacrylonitrile protofilament.

The invention discloses a tenacity coating for preventing steel bars from being corroded. The tenacity coating is prepared from 45-70 parts of mica powder, 25-50 parts of borax, 0.5-3 parts of silicon carbide whisker, 3-12 parts of magnesium oxide, 1.0-10 parts of adhesive agents and 0.25-1.8 parts of thickening agents. The invention further discloses a coating method of the tenacity coating. The coating method includes the following steps of 1, dry mixing, 2, wet mixing, 3, preprocessing, 4, coating, 5, drying, 6, sintering and 7, room-temperature cooling. The tenacity coating is simple in process, high in strength, good in dense performance, good in anticorrosion performance, high in tenacity and high in coating ductility, the silicon carbide whisker is introduced into the coating, so that in the breakage process of the anticorrosive coating, energy is absorbed through crack deflection, fiber breakage, fiber pull-out and the like, the tenacity of the coating is increased, and formation of cracking is delayed.

The invention discloses a steel fiber tensioning and clamping fixture and a steel fiber tensile strength testing system. The steel fiber tensioning and clamping fixture comprises a main bracket, a load transmission mechanism and a steel fiber test piece clamping and locking mechanism, and clamping pieces can effectively clamp and tension a steel fiber test piece in the tensioning process; the steel fiber tensile strength testing system comprises two sets of steel fiber tensioning and clamping fixtures and a data acquisition device, the data acquisition device comprises a load sensor, an extensometer and a controller, the two sets of steel fiber tensioning and clamping fixtures are used for clamping the steel fiber test piece, the extensometer is arranged on the steel fiber test piece, output ends of the load sensor and the extensometer are connected with two input ends of the controller, and an output end of the controller is connected with a computer. According to the steel fiber tensioning and clamping fixture and the steel fiber tensile strength testing system, the tensile strength and the deformation parameters of steel fibers as well as the stress-strain complete curve in the steel fiber breakage process can be accurately tested.

The invention discloses an intelligent sewage treatment system. A pressure transmitter which is connected with an automatic control system is arranged on a water-producing pipe, wherein the automatic control system is capable of automatically controlling on/off of a water inlet valve, a water-producing valve, a backwash valve, a mud discharge valve, a blow-down valve and a chemical dosing valve under the action of the pressure transmitter or according to the operation time of the intelligent sewage treatment system, so that in-situ online cleaning and in-situ offline cleaning of an MBR reaction system are automatically controlled; the error of manual operation is reduced; the management cost is reduced; the condition that the MBR reaction system is in a good operation state is ensured; frequent lifting of a membrane module is avoided; the fiber breakage ratio is reduced; the service life of an MBR membrane bioreactor is prolonged; and the exchange cost is reduced. In addition, a sludge reflux system comprising namely a sludge guide plate and a sludge hopper is additionally arranged in the intelligent sewage treatment system disclosed by the invention, thereby achieving significant assisting action for the phosphorous removal effect of the MBR membrane bioreactor.

The invention provides an optical efficiency testing method for an infrared fiber image-transmitting bundle, wherein the optical efficiency of the to-be-tested fiber image bundle is tested through stable infrared radiation energy I1 which is obtained by a standard black body and infrared radiation energy that is output through transmission of the fiber image-transmitting bundle. Compared with a method of testing optical fiber damping (unit dB/m) or parallel light transmittance through a truncation method in current fiber testing, the optical efficiency testing method has advantages of higher visuality and higher pertinency. The optical efficiency testing method more accords with optical transmission characteristic of the fiber and can more accurately reflect optical transmission performance of the fiber image-transmitting bundle. The optical efficiency testing method can settle a problem of no specialized instrument and device for testing the performance of the infrared fiber image-transmitting bundle. Furthermore an optical efficiency testing device of the optical efficiency testing method can be used for testing other main indexes such as arrangement irregularity and fiber breakage rate in the fiber image-transmitting bundle.

The invention discloses a polyvinyl alcohol master batch-polylactic acid composite fiber. The polyvinyl alcohol master batch-polylactic acid composite fiber is characterized by being prepared by co-blending and modifying a polyvinyl alcohol master batch and polylactic acid, and performing melt spinning, wherein a mass proportion of the polyvinyl alcohol master batch to the polylactic acid is (3 to 7) to (2 to 6), and the modified composite fiber contains a -NH-CO- radical. The polyvinyl alcohol-polylactic acid composite fiber has high water solubility, high strength, high dispersity in water, is more than or equal to 260cN/dtex in the modulus, is 10 to 20 percent in the fiber breakage elongation rate, and is up to level 1 in the fiber dispersion level; after an aqueous solution containing 5 percent of composite fiber is heated to 90 DEGC C and is kept at the temperature of 90 DEG C for 5 hours, the composite fiber can be dissolved by 35 to 60 percent; after an aqueous solution containing 5 percent of composite fiber is heated to 90 DEGC C and is kept at the temperature of 90 DEG C for 25 hours, the composite fiber can be dissolved by 99.5 to 100 percent.

The invention discloses a preparation method of a textile waterproofing agent, and belongs to the field of textile waterproofing materials. Nano-silica is modified by coupling agents, owing to small size effects and macroscopic quantum tunneling effects of the nano-silica, fiber breakage can be effectively prevented, the abrasion resistance of a serous membrane is improved, the dispersibility of the nano-silica can be improved, and mallow bark extracting solution is adsorbed by the adsorption performance of the nano-silica. As extracting solution molecules contain much -OH and enter a weave structure of a silk fabric, fibers generate good cohesiveness, and the tensile property and the ultraviolet resistance of the fabric are improved. The preparation method solves the problems of low tensile property and fiber breakage of fabrics due to the fact that waterproofing agents in the present market cannot effectively prevent water.