349 results about "Melting temperature" patented technology

The invention discloses a matte glaze and a preparation method thereof. The matte glaze comprises the following components by weight: 1-5 parts of zinc oxide, 5-15 parts of barium carbonate, 0-15 parts of zirconium silicate, 10-25 parts of potassium feldspar, 10-20 parts of kaolin, 5-15 parts of calcite, 5-15 parts of calcined talcum powder, 20-35 parts of a matte frit and 0.5-1 part of an additive. Specifically, the matte frit comprises the following components by weight: 30-50 parts of SiO2, 15-20 parts of Al2O3, 0.01-0.5 part of Fe2O3, 3-10 parts of CaO, 0.5-5 parts of MgO, 1-5 parts of K2O, 3-10 parts of Na2O, 3-10 parts of ZnO, 0.1-1 part of B2O3 and 10-25 parts of BaO. By introducing the matte frit, the melting temperature of the formula is lowered, the firing range of the formula isbroadened, and the glaze texture achieves a fine matte effect.

A screen making machine includes a table, welder assembly, and actuation assembly. The welder assembly includes: a hot air nozzle, a pump, and a roller. The actuation system moves the welder assembly along the frame. Hot air from the nozzle elevates the temperature of the mesh and adjacent frame to an elevated temperature above a melt temperature of the surfaces of the mesh and frame. The roller presses the melted mesh surface against the melted frame surface, to melt fuse them together.

The invention relates to a copper cable insulation layer extrusion molding method and system based on dynamic temperature control, and belongs to the technical field of copper cable production. The method comprises the steps that the surface temperature of a copper core before the copper core enters an extrusion die head and the melt temperature of a plurality of independent temperature control sections divided by the extrusion die head in the material advancing direction are obtained in real time; meanwhile, feedback adjusting quantity is calculated based on the temperature difference between the melt temperature and the preset target melt temperature, the feed-forward compensation quantity and the feedback adjusting quantity are superposed to obtain comprehensive adjusting quantity of the heating power of each section, and real-time closed-loop adjustment is conducted on the heating power of each section of the extrusion die head according to the comprehensive adjusting quantity; and the flow and the temperature of the cooling medium are adaptively adjusted according to the temperature gradient of the surface temperature along the axial direction, and non-uniform gradient cooling is carried out on the insulating layer. The copper cable insulation layer extrusion molding method and system based on dynamic temperature control at least solve the problems of poor thickness uniformity of an insulation layer, large internal residual stress and unstable adhesive force with a copper core in the prior art.

The invention relates to the field of battery materials, in particular to a binder material, a preparation method, a positive electrode material and a battery. The preparation method provided by the invention comprises the following steps: mixing and grinding a raw material compound and an additive into mixed powder; heating the mixed powder to a melting temperature in a protective gas atmosphere and carrying out a reaction to obtain a molten mass; the molten mass is cooled based on the rapid quenching technology, a nanocrystalline area and an amorphous area are formed in the molten mass cooling process, and a composite structure thin strip is obtained after cooling; forming a lithium-rich layer on at least part of the surface of the composite structure particle; providing a carbon source, mixing the composite structure particles forming the lithium-rich layer with the carbon source, and then carrying out heating treatment to form a carbon layer wrapping the surfaces of the composite structure particles and the lithium-rich layer; and epitaxially growing a carbon nanotube layer on the outer surface of the carbon layer, and obtaining the binder material after the epitaxial growth is completed. A novel binder material which has good ion / electron conductivity, mechanical properties adapting to volume change and suitable processing characteristics is found.

The invention discloses rare earth co-doped alkali-free aluminum borosilicate glass and application, and the rare earth co-doped alkali-free aluminum borosilicate glass comprises the following components in percentage by mole: 68.85-69.60% of SiO2; 13.50%-14.15% of Al2O3 (aluminum oxide); 1.50 to 1.70 percent of B2O3 (boron trioxide); 4.45% to 4.60% of MgO; 5.45% to 5.80% of CaO; 1.20% to 1.80% of SrO; 0.50 to 2.80 percent of La2O3 (La2O3); 0.70% to 3.00% of Y2O3; and 0.10%-0.30% of SnO2. The rare earth co-doped alkali-free aluminum borosilicate glass has a high strain point, a low melting temperature, a low thermal expansion coefficient and a high elastic modulus, production energy consumption is reduced as much as possible under the condition that various properties are improved, and the production and manufacturing requirements of OLED display panels are met.

The invention discloses a modified plastic processing temperature adaptive control method, and relates to the technical field of high polymer material processing control, and the method comprises the following steps: collecting the same frequency mapping of power grid disturbance and melt temperature response, capturing the transient power fluctuation of a heating unit with millisecond-level time precision by adopting a phase comb sampling technology, and constructing a power pulse fingerprint database; a parameter space for discriminating a pseudo-steady state is established based on a power pulse fingerprint database, a short-time power pulse signal and a stable signal are classified by using a phase lag and entropy increase dual-threshold method, and a pseudo-steady state confidence index is generated. According to the method, the power pulsation fingerprint database and the electrothermal coupling model are constructed, pseudo-steady-state temperature control abnormity is accurately recognized, reverse energy regulation and control are achieved in combination with a sensitivity track and a thermal write-back mechanism, the melt temperature stability is improved, the product warping rate is effectively reduced, and the size consistency and the mechanical property are remarkably optimized.

The invention relates to the technical field of PE lamination production control, and discloses a distributed control system for a high-speed PE lamination production line. A base material state monitoring module of the system collects surface tension parameters and thickness distribution data of a base material in real time, and a dynamic base material state matrix is generated in combination with the operation speed of the base material; the temperature field coordination module is used for matching a preset melt temperature gradient curve according to thickness distribution data in the dynamic base material state matrix and generating a partition temperature regulation and control instruction set; the extrusion pressure balance module analyzes the pressure fluctuation historical record of each extrusion section based on the partition temperature regulation and control instruction set, calculates the pressure compensation amount of adjacent sections and generates a pressure balance parameter table; the film layer fusion control module receives the compensation amount data, adjusts the rotating speed difference of the double-screw extruder and the opening degree parameter of a die head in combination with the real-time melt casting speed, and outputs a film layer fusion quality index; and the distributed execution module decomposes the film fusion quality index into independent control instructions and synchronously issues the independent control instructions to each execution unit.

The invention relates to the technical field related to process parameter management, in particular to a multi-modal data driven foamed aluminum process parameter optimization method and system, and the method comprises the steps: obtaining a foamed aluminum process parameter set, and configuring a process feature vector; according to the porosity standard deviation, the density uniformity index and the modified compressive strength variable coefficient of the foamed aluminum finished product, a melt temperature regulation and control subsequence and a foaming agent adding subsequence are determined, a control instruction set is generated in combination with a process feature vector, and synchronous issuing is performed by using an industrial Internet of Things gateway. The technical problems that foamed aluminum technological parameter optimization mostly depends on single parameter adjustment, the matching degree of parameter adjustment and finished product quality characteristics is low, and foamed aluminum production stability is limited are solved, collaborative optimization of melt temperature adjustment, foaming agent adding and mold pressure adjustment is achieved, a control instruction set is generated, and the production efficiency is improved. Therefore, the porosity standard deviation of the foamed aluminum finished product is reduced, the density uniformity index is improved, and the technical effects of process stability and finished product quality consistency are improved.

This invention belongs to the field of medical device technology and discloses a barbed suture and its preparation method. The barbed suture includes a suture body and barbs formed on the suture body. The preparation method involves irradiating the horizontally arranged suture body with a laser beam emitted from a laser, the temperature of which is higher than the melting temperature of the suture body. T m At the same time, it is lower than the thermal decomposition temperature of the suture body. T d The laser is positioned directly above or slightly above the suture body. The laser beam is decomposed into horizontal and vertical components. The horizontal component is parallel to the length of the suture body, and the vertical component points downwards. During irradiation, the laser reciprocates along a horizontal direction perpendicular to the length of the suture body, causing the laser beam to cut the suture body and form barbs. This invention allows the barbs to bend and curl upwards, achieving high-curvature barbs, and the resulting barbed sutures do not suffer from insufficient strength due to a reduction in suture diameter.

The invention discloses a microcapsule phase change cement material, which is prepared by compounding a microcapsule with phase change performance and a cement matrix, the microcapsule is of a core-shell structure, the raw materials of the shell are melamine, urea and formaldehyde, the raw material of the core material is octadecane, and Tween 80 and lauryl sodium sulfate are used as emulsifiers. The preparation method comprises the following steps: 1, preparing an MUF resin prepolymer; 2, preparing a core material O / W emulsion; 3, polymerization reaction of the microcapsules; and 4, preparing the microcapsule phase change cement material. When the composite material is used as a cement-based composite material, the melting temperature ranges from 25 DEG C to 29 DEG C, the crystallization temperature ranges from 19 DEG C to 23 DEG C, the melting enthalpy ranges from 13.47 J / g to 29.78 J / g when the mixing amount is 10%-30%, the crystallization enthalpy ranges from 12.94 J / g to 28.41 J / g, and the coating efficiency is 67.5%. The initial decomposition temperature ranges from 386.13 DEG C to 390.96 DEG C, the finishing temperature ranges from 399.49 DEG C to 406.42 DEG C, and the maximum degradation temperature ranges from 438.78 DEG C to 443.64 DEG C; the heat conductivity coefficient is 0.3216 to 0.3949, and is improved by 39.4 percent compared with that of standard cement.

The invention provides a multi-printing-nozzle automatic switching method, a multi-color 3D printing system and a computer storage medium. The multi-printing-nozzle automatic switching method is applied to a multi-color 3D printing system. The method comprises the steps that stopping coordinates and material color information of all nozzles are obtained; a printing instruction is responded, a tool head is used for clamping an initial nozzle to a calibration position to obtain reference coordinates of the initial nozzle, then the initial nozzle is moved to the position above a hot bed, the nozzle is heated to the melting temperature to complete the color printing task, heating is stopped after completion, and the nozzle is reset; and for the follow-up ith color task, the tool head clamps the corresponding ith spray head to the same calibration position to obtain the coordinates to be calibrated, the offset is calculated by using the coordinates to be calibrated and the reference coordinates, the coordinates of the spray head are calibrated, and finally the calibrated spray head is controlled to move to the hot bed to continue to execute the printing task. According to the method, the cost of the multi-color 3D printing system can be reduced, and meanwhile higher printing efficiency is achieved.

The invention relates to the technical field of robot control, and particularly discloses a cable coating robot control method and system capable of gaining along with speed, and the method comprises the steps: detecting the cable traction speed, the extruder screw torque, the actual coating melt temperature and the die head pressure in real time; determining a compensation gain based on the extruder screw torque, the actual temperature of the coating melt and the calibration basic gain; determining an output gain based on the cable traction speed-gain segmentation mapping function; calculating a final gain based on the absolute deviation between the die head pressure and the set pressure and the output gain; controlling the output flow of the extruder based on the final gain and the cable traction speed; according to the invention, precise regulation and control of the output flow of the extruder are realized, and the stability and consistency of the cable coating process are ensured, so that the cable coating quality is improved, the material waste is reduced, and the production efficiency is improved.

A braze tape includes a first portion, a second portion, and a central portion located between and adjacent to the first portion and the second portion. The first portion includes a low melting temperature alloy material, the second portion includes a high melting temperature alloy material, and the central portion includes a mixture of the low melting temperature alloy material and the high melting temperature alloy material. The central portion may gradually change between the low melting temperature alloy material and the high melting temperature alloy material. A related method is also disclosed.

The application discloses a method for preparing an indium-based soft soldering sheet by vacuum hot pressing, belongs to the technical field of thermal interface materials for chip packaging and IGBT power module welding material preparation, and is characterized in that pure indium powder or indium-tin mixed alloy powder is uniformly laid in a graphite mold, the graphite mold is vibrated or knocked, and the pure indium powder or indium-tin mixed alloy powder is laid flat and densely; the graphite mold is fixed in a vacuum hot pressing machine, a pressure of 10 MPa is applied to the vacuum hot pressing machine, vacuum is drawn to 1*10 ‑3 Pa, a temperature rising rate is controlled to be less than 5 DEG C / min, when the temperature rises to the melting point of indium or the melting temperature of the indium-tin mixed alloy, a pressure maintaining state is kept for 0.5-1 hours, then the mold is cooled to room temperature along with the furnace, the mold is taken out, and a pure indium soldering sheet or an indium-tin-based multi-element alloy soldering sheet is obtained. The method has simple process and low energy consumption, and the performance of the prepared soft thin soldering sheet is obviously improved.

Welding equipment for aluminum profile machining relates to the field of aluminum alloy door and window production and machining and comprises a welding mechanism, the welding mechanism comprises a welding furnace assembly, a hot melting assembly and an electric heating assembly, and the hot melting assembly and the electric heating assembly are both arranged in the welding furnace assembly. The welding furnace assembly comprises a furnace body and a heating chamber, the heating chamber is arranged in the furnace body, a heat insulation lining made of insulation materials is arranged on the inner wall of the heating chamber, the hot melting assembly comprises a heating coil, the heating coil is arranged in the middle of the inner wall of the heating chamber, and the electric heating assembly comprises electrode sleeves arranged at the two ends of the heating chamber. The butt joint position of the aluminum profiles is heated to be close to the melting temperature through the hot melting assembly in the welding mechanism, then the two aluminum profiles are connected with a power source through the electric heating assembly, the contact position of the two aluminum profiles is further heated and melted due to short circuit of a circuit, the welding faces at the two ends of the aluminum profiles can be fully fused and welded, and the welding quality is improved. The welding position of the aluminum profile is more sufficient, and the welding quality is improved.

The invention relates to the technical field of float glass production, in particular to a float glass production line simulation method and system and electronic device.The float glass production line simulation method comprises the steps that a simulation model is constructed in a three-dimensional modeling mode, the simulation model is used for simulating at least one of a batching system, a melting system, a forming system, an annealing system and a cold end system; simulation parameters are set, wherein the simulation parameters comprise at least one of the raw material ratio, the melting temperature, the forming speed and the annealing temperature; the simulation model is operated according to the simulation parameters so as to simulate the float glass production process, and the production process comprises at least one procedure of raw material factory entering, storage, homogenization, feeding, weighing, mixing, conveying, melting, cooling, forming, annealing, cutting and packaging. The float glass production process can be analyzed, the production parameters and the technological process are optimized, and the production efficiency and the product quality are improved.

The invention discloses a lightweight high-strength concrete thermal insulation wallboard for a high-rise building and a preparation method of the lightweight high-strength concrete thermal insulation wallboard. The lightweight high-strength concrete thermal insulation wallboard comprises the following raw materials in parts by weight: 300-500 parts of cement, 60-90 parts of slag powder, 60-100 parts of silica fume, 60-90 parts of microbeads, 100-200 parts of floating beads, 500-900 parts of modified lightweight aggregate, 15-20 parts of alkali-resistant glass fibers, 25-40 parts of a water reducing agent and 180-220 parts of water. According to the invention, a layer of'hard shell 'is formed on the surface after the shale ceramsite is wrapped and reinforced by the light cement paste, the problem of high water absorption rate of the shale ceramsite is improved, meanwhile, the mechanical property of the shale ceramsite is improved, secondly, the self-made lightweight aggregate is low in water absorption rate and high in strength, the density of the self-made lightweight aggregate is close to that of a gelling matrix of the thermal insulation wallboard, and the aggregate can be prevented from floating or sinking; the floating beads are added into the modified lightweight aggregate, so that the prepared lightweight wallboard is good in homogeneity, low in water absorption and good in mechanical property, the weight of the wallboard can be reduced through cooperation of the floating beads in the thermal insulation wallboard and the modified lightweight aggregate, meanwhile, the floating beads have excellent fire resistance and heat insulation performance, and the heat insulation and fire resistance of the lightweight wallboard can be improved through cooperation of the floating beads and the alkali-resistant glass fibers with the high melting temperature.

This invention provides a multi-layer gradient composite sheath flame-retardant power cable, relating to the technical field of power cables. It includes, from the inside out, a conductor core unit, a filling layer, an inner reinforcing layer, and a multi-layer gradient composite sheath. Several groups of conductor core units are uniformly distributed along the circumference of the cable. Each conductor core unit includes a conductor core, the outer wall of which is covered with a conductor insulation layer. A fire-resistant carbon layer is coaxially arranged on the outer side of the conductor insulation layer. This invention achieves initial fire extinguishing by placing a fire-extinguishing medium capsule inside the conductor core unit and filling the cavity with fire-extinguishing medium. Combined with a thermoplastic sealing film and a gas generator, when the temperature reaches the melting temperature of the thermoplastic sealing film, the film melts, and the fire-extinguishing medium is released through an overflow hole, directly acting on the heated surface of the conductor insulation layer. Simultaneously, the gas generator decomposes upon heating, releasing nitrogen and carbon dioxide gases, which are released through an outlet pipe, forming a flame-retardant gas atmosphere.

Methods of three-dimensional printing can include iteratively applying a polymer build material as individual layers to a powder bed, where the polymer build material includes from about 80 wt % to 100 wt % polymer build particles, and based on a three-dimensional object model, selectively applying a binder agent including an aqueous liquid vehicle and polymer binder particles onto the individual layers of the polymer build material. The polymer binder particles have or are capable of having a melting temperature lower than a melting temperature of the polymer build particles. The methods can include exposing the powder bed to heat at a temperature less than a melting point of the polymer build particles but greater than a melting temperature of the polymer binder particles. The heat causes the polymer binder particles to melt to adhere the polymer build particles together to form a three-dimensional object.

A method of making negative electrode material having silicon and silicate includes the steps of providing raw materials for contact-fusion, heating the raw materials to form materials with a contact-fusion state, mixing silicon and the materials after forming contact-fusion to form a composite material, and vaporizing the composite materials on the deposition zone after the mixing step. The heating step is performed at the temperatures between the lowest melting temperature of the materials with the contact-fusion state and 1400° C. The deposited composite materials can be optionally heat treated, pulverized, and / or coated with carbon. Also provided is a negative electrode material of silicon and silicate made from the steps described above. The negative electrode material of silicon and silicate can be an Li—Mg silicate having silicon powder dispersed therein, the Li—Mg silicate forming a uniform interface on surfaces of the silicon powder.

A composition comprising a first composition, and wherein the first composition comprises the following components a and b: a) at least one ethylene / alpha-olefin multi-block interpolymer that comprises a density≤0.880 g / cc and a soft segment melting temperature (SS-Tm)≤2.0° C.; b) at least one propylene-based polymer; and wherein component a is present in an amount ≥88 wt %, a based on the sum weight of components a and b.

The application discloses a design method and system of a single-crystal high-temperature alloy solid solution heat treatment system, relates to the cross technical field of numerical simulation and material processing, and comprises the following steps: based on the relationship between element concentration and solidus temperature, determining the solidus temperature distribution of a cast single-crystal high-temperature alloy sample according to the element concentration distribution extracted from the cast single-crystal high-temperature alloy sample; adopting a phase field method to simulate solid solution heat treatment of the cast single-crystal high-temperature alloy sample, so as to obtain the element concentration distribution under the initial melting temperature and heat preservation for one simulation time step, and mark the element concentration distribution after treatment as the element concentration distribution, and determine the segregation coefficient of each element; when the segregation coefficients of all elements are within a preset range, marking all initial melting temperatures and corresponding current simulation times as heat treatment simulation results, and then determining the actual solid solution heat treatment system of the cast single-crystal high-temperature alloy sample. The application has the advantages of short time consumption, high efficiency and low cost.

The invention relates to the technical field of waxy materials, and particularly discloses light touch melting wax as well as a preparation method and application thereof, the light touch melting wax comprises the following components: 30-50 parts of ozokerite, 10-50 parts of microcrystalline wax, 3-7 parts of light microspheres, 6-12 parts of vegetable fat wax and 1-3 parts of a regulator; the touch melting wax prepared by the preparation method disclosed by the invention is light in texture, has temperature-responsive touch melting characteristic and oil locking capability, improves the wrapping and fixing capability of the wax on oily components by optimizing the crystal structure of the wax and introducing oil locking auxiliary components, is high in stability, can still keep stable oil locking performance in the storage process, and avoids oil migration and layering; the air permeability is improved by a network structure formed by dispersing introduced light microspheres, the melting temperature is close to the temperature of human skin, the melting time is less than 10s by adding the light microspheres and the regulator and optimizing the composition proportion of the microcrystalline wax and other raw materials, the product is quickly softened but does not flow when being touched, and a formed film layer is compact and has strong oil locking capacity.

The invention relates to a process for recycling a particulate semi-crystalline polyamide, the initial particulate semi-crystalline polyamide having already been used in a layer-by-layer printing process, the process comprising: - a step of contacting the initial particulate semi-crystalline polyamide with water and at least one acid; - a step of heating the initial particulate semi-crystalline polyamide to a temperature above Tc – 20°C and below Tf, Tc denoting the crystallization temperature of the initial particulate semi-crystalline polyamide and Tf being the melting temperature of the initial particulate semi-crystalline polyamide, and - a step of collecting the treated particulate semi-crystalline polyamide, in which the treated particulate semi-crystalline polyamide has an inherent viscosity lower than the inherent viscosity of the initial particulate semi-crystalline polyamide.

A method for reducing or eliminating Si contained in an aluminum alloy including: holding the aluminum alloy and Sn at a melt temperature at which the aluminum alloy and Sn are melted; lowering the melt temperature, and holding the aluminum alloy and Sn at a Si crystallization temperature at which solid Si is crystallized while maintaining a molten state of Sn and Al, and separating the solid Si; and further lowering the temperature and holding the aluminum alloy and Sn at an Al crystallization temperature at which Al is crystallized and Sn is in the molten state, to separate and recover solid Al.

The invention discloses low-viscosity stable casting powder suitable for high-speed continuous casting of Q355B steel, belongs to the technical field of casting powder preparation, and aims at solving the technical problem that the melting performance and the operation stability of existing continuous casting powder need to be further improved in the using process. According to the invention, lithium boron aluminum silicon glass precursor powder, oxygen-nitrogen crystal control micronucleus powder and calcium magnesium phosphorus boron viscoelastic powder are synergistically introduced into the continuous casting mold flux, and systematic configuration is carried out on the preparation and batching process, so that a multi-layer synergistic structure organization path covering the whole process of melting starting, liquid slag formation and slag film evolution is constructed; according to the technical scheme, the casting powder keeps proper viscosity, low melting temperature and short melting time, co-evolution of liquid phase generation and slag film formation is achieved, and stable interface behavior and structural response are shown in actual continuous casting operation; and therefore, the occurrence tendency of defects such as pinhole bubbles, honeycomb bubbles and middle cracks on the surface of the Q355B steel continuous casting billet can be reduced.

A method for preparing an indium-based soft soldering lug through vacuum hot press molding belongs to the technical field of preparation of thermal interface materials for chip packaging and IGBT (insulated gate bipolar transistor) power module welding materials, and comprises the following steps: uniformly paving pure indium powder or indium-tin mixed alloy powder in a graphite mold, and vibrating or knocking the graphite mold to make the pure indium powder or the indium-tin mixed alloy powder flatly and compactly paved; fixing the graphite mold in a vacuum hot press, applying a pressure of 10 MPa to the vacuum hot press, vacuumizing to 1 * 10 <-3 > Pa, and controlling the heating rate within 5 DEG C / min; and when the temperature rises to the melting point of indium or the melting temperature of the indium-tin mixed alloy, keeping a pressurized state and preserving heat for 0.5-1 hour, then cooling the mold to room temperature along with the furnace, and taking out the mold to obtain the pure indium soldering lug or the indium-tin-based multi-component alloy soldering lug. The method is simple in process and low in energy consumption, and the performance of the prepared soft thin soldering lug is remarkably improved.

The invention discloses a method for rapidly and accurately determining multiple elements of limestone powder based on a fuse piece method, and belongs to the technical field of material detection. A fuse piece scheme is designed aiming at the characteristics of fine particles, easy moisture absorption and the like of limestone powder instead of improving a general scheme of materials such as limestone, dolomite and the like, key parameters are optimized, the flux ratio is set as follows: the ratio of lithium tetraborate to lithium metaborate is 67: 33, melting is divided into three processes of preheating, pre-oxidation and melting, the melting temperature is effectively controlled to be 1060 DEG C, the time is 60 seconds, and the melting efficiency is greatly improved. The problem that limestone powder is prone to excessive melting or uneven melting is solved, the matrix effect and the particle size effect are greatly reduced, it is verified that three limestone powder standard samples with known components are selected for testing, the relative error between the result and the standard value is smaller than 1%, data meet the strict allowance requirement of the industry, and compared with an existing fuse piece method, the method has the advantage that the cost is low. The detection adaptability to the limestone powder is remarkably improved, and the component detection requirements of mainstream limestone powder in the industry can be met.

The application provides a PVC film preparation system and method based on industrial intelligent vision. In a stable production process of an extruder, an extruder screw torque signal and a melt temperature signal are collected, and a PVC film surface image sequence is obtained in real time. A black point density change rate per unit area in the PVC film surface image sequence is counted, and an area distribution feature of the black points in the PVC film surface image is extracted. A torque fluctuation amplitude in the screw torque signal and an over-threshold integral quantity of the melt temperature signal are calculated. The area distribution feature, the torque fluctuation amplitude and the over-threshold integral quantity are used to determine the causes of the black points in the PVC film preparation, and a determination result of the causes of the black points is obtained. Based on the black point density change rate and the cause category of the determination result, a parameter adjustment amount is calculated, and a speed adjustment amount and a maintenance time required to reduce the black point density to a target value are output. Based on the above scheme, cause category quantitative determination based on multi-source signal fusion can be realized.

Method for sealing the end of a thermoplastic composite pipe and pipe obtained. The present invention relates to a method for sealing one end of a thermoplastic composite pipe, comprising the steps of: - supplying a thermoplastic composite pipe comprising a tubular inner sheath and a reinforcing composite structure comprising a high-performance semi-crystalline thermoplastic Psc1 polymer having a melting temperature Tf1, - deposition by dynamic gas spraying, onto a portion of the reinforcing composite structure located at one end of the thermoplastic composite pipe, of a powder of a high-performance amorphous thermoplastic Pam polymer, thereby forming a junction layer; - deposition by dynamic gas spraying, onto at least a portion of said junction layer, of a powder of a high-performance semi-crystalline thermoplastic Psc2 polymer, thereby forming a sealing layer.The resulting thermoplastic composite pipe and a flexible conduit comprising it. Figure for the abbreviation: 2,