12 results about "Screw speed" patented technology

This invention relates to the field of polymer material processing and blending technology, and discloses a fiber uniform mixing process in the preparation of bio-based materials. The process includes: controlling the barrel wall temperature of the main dispersion zone of a co-rotating twin-screw extruder to be lower than the intrinsic melting point of the polylactic acid matrix and turning off the external heater; adding jute fiber bundles and the polylactic acid matrix and controlling the screw speed, utilizing the frictional heat balance temperature difference generated by mechanical shearing to maintain the actual melt temperature above the intrinsic melting point; and conveying the mixture to the secondary diffusion zone as the motor drive torque increases, thereby increasing the barrel wall temperature of the secondary diffusion zone and reducing the screw speed to blend the materials. This invention eliminates temperature control lag, maintains a stable shear flow field, avoids a sudden drop in melt viscosity to improve fiber dispersion uniformity, automatically indicates process stage transitions, avoids material thermal degradation, and improves the stability of the mechanical properties of the finished material.

The application relates to the technical field of building, in particular to a high-molecular composite material for catalytic degradation of formaldehyde and a preparation method thereof, which comprises the following steps: determining the adding amount of a stabilizer based on the melt flow rate and the oxidation induction period of random copolymerized polypropylene, and modifying the stabilizer to obtain a first intermediate product; determining the preset feeding proportion of the first intermediate product based on the oxidation induction period of the first intermediate product; heating and blending raw materials in a screw extruder to obtain a second intermediate product, determining a mixed state characteristic value based on the density and the agglomeration index of the metal oxide, and determining whether the mixed state of the second intermediate product meets the standard, and checking the mixed state when the mixed state does not meet the standard; adjusting the screw rotation speed of the screw extruder based on the melt color uniformity feedback of the second intermediate product; and cooling and forming the second intermediate product after extrusion to obtain a product. The application solves the problem that the uneven dispersion of nanoscale metal oxide particles leads to the local degradation of formaldehyde.

The application discloses transparent flame-retardant polycarbonate and a preparation method thereof. The preparation method comprises the following steps: dry mixing polycarbonate resin, sulfonate flame retardant, a compatilizer and an additive in a high-speed mixer for 3-8 minutes; melt blending is performed by using a co-rotating twin-screw extruder to disperse the sulfonate flame retardant to a sub-micron level; wherein the twin-screw extruder is provided with a high-shear screw element in a mixing section, and the screw length-diameter ratio is 40:1 to 48:1; the screw rotation speed is 200-400 rpm; extruded strip material is water-cooled and pelletized to obtain transparent flame-retardant polycarbonate particles. By means of the micro-dispersion and compatilization process, micron-level dispersion and stable compatibility of the sulfonate flame retardant in the polycarbonate are realized, so that the flame-retardant efficiency and product life are improved while the high transparency is maintained.

The application discloses a high-barrier environment-friendly plastic production line collaborative optimization system based on digital twinning, and relates to the technical field of high-barrier environment-friendly plastic production control.The system collects the temperature control sequence of the co-extrusion cylinder and the screw rotation speed array, analyzes the melt conveying track in combination with the screw groove geometric characteristics, generates a dynamic history matrix of the cumulative amount of heating and shearing; based on the die flow channel topology, the dynamic history matrix is substituted into the non-Newtonian constitutive equation to perform rheological field mapping, the viscosity step barrier and shear stress gradient of the interface grid are quantified, and the stress overshoot is extracted when the interface sliding critical phase is crossed; the stress overshoot is mapped as a predictive control cost constraint, a sensitivity matrix is constructed relying on the heat transfer coupling relationship, and the temperature and screw rotation speed adjustment parameter sequence of the extruder cylinder are inversely solved; the heat distribution is previewed in the twin space and the residence temperature peak value is extracted, the temperature fine adjustment amount is executed amplitude clipping when the thermal decomposition critical point is crossed, and the traction roller linear velocity gain command is solved according to the uncompensated residual value and is synchronously issued and executed.

This invention relates to the field of polymer materials technology and discloses a modified silica-containing anti-aging material and its preparation method. The preparation method is as follows: polypropylene resin, modified silica, modified alkylphenol, calcium stearate, and antioxidant 1010 are added to a high-speed mixer and mixed for 10-20 minutes to obtain a mixture. Then, the mixture is added to a twin-screw extruder and extruded at 160-180°C and a screw speed of 200-250 rpm. The mixture is then granulated to obtain the modified silica-containing anti-aging material. This invention's anti-aging material not only possesses excellent anti-aging properties but also improves mechanical properties.

This invention discloses a halogen-free flame-retardant polypropylene material for lithium battery films, relating to the field of polymer composite materials technology. It comprises the following components by weight: 55-65 parts copolymer polypropylene; 20-30 parts ammonium polyphosphate; 5-15 parts melamine cyanurate; 2-5 parts nano-silica; 0.3-0.8 parts antioxidant 1098 / 168; and 0.5-2.0 parts silicone masterbatch. A method for preparing the halogen-free flame-retardant polypropylene material for lithium battery films includes the following steps: S001, polypropylene, APP, MCA, nano-SiO2, and antioxidant are added to a high-speed mixer in proportion and stirred at 150±5℃ for 10-15 minutes; S002, the mixture is added to a twin-screw extruder and melt-blended at a gradient temperature of 170-200℃, with the screw speed controlled at 300-500 rpm; S003, the melt is water-cooled, pelletized, and dried to obtain masterbatch. In this invention, the surface of nanoparticles is modified at 150°C using a silane coupling agent, thereby reducing the particle size of the aggregates from 500 nm to below 80 nm.

The present application relates to a method, a device, a apparatus, and a storage medium for diagnosing hydraulic injection molding machine malfunctions in the field of injection molding technology, wherein the method comprises: during the plasticizing process of the hydraulic injection molding machine, comparing a standard screw speed range G1, a standard electric motor speed range M1, and a standard electric motor speed range m2; if the current screw speed is less than range G1 and the current plasticizing pressure is less than the standard plasticizing pressure range P1, checking whether the current electric motor speed is within range M1; if the current electric motor speed is within range M1, outputting a plasticizing motor malfunction;If the current electric motor speed is outside the range M1, based on whether the electric motor speed during plastic injection of the hydraulic injection molding machine is within the range m2, fault information is output.

A process for producing a polypropylene composition using a compounding extruder comprising a) a melting section (100) comprising a first elongated cylindrical tube having an end with a first inlet (101), an end with a first outlet (102) and a first screw; b) a mixing section (200) comprising a second elongated cylindrical tube having an end with a second inlet (201), an end with a second outlet (202), side inlets (204, 205, 206) between the second inlet and the second outlet and a second screw, wherein the process comprises the steps of: A) feeding a propylene-based polymer and optionally additives to the first inlet and discharging a first melt composition from the first outlet, wherein the first screw is operated at a first screw speed, and B) feeding the first melt composition from the first outlet to the second inlet and feeding other components to the side inlets, and discharging a second melt composition from the second outlet, wherein the second screw is operated at a second screw speed which is less than the first screw speed.

This invention belongs to the field of automatic control and relates to a PLC-based automatic control method and system for dry powder pressure rollers. The method includes: collecting the main motor current, real-time roller pressure, roller gap, and feed screw speed of the pressure roller; calculating state parameters based on the changes in real-time roller pressure and real-time roller gap; using a reference pressure as the target roller pressure, setting a current threshold based on the state parameters; when the main motor current exceeds the limit, calculating the pressure reduction using a nonlinear attenuation function to correct the target roller pressure; based on the deviation between the target roller pressure and the actual roller pressure and the state parameters, obtaining PID control parameters from a preset multidimensional gain surface for calculation to obtain the basic control quantity; simultaneously, combining the feed screw speed with feedforward calculation to obtain the pressure fluctuation prediction compensation quantity; judging the system stability based on the real-time roller pressure change rate; and executing hydraulic control commands by the PLC to achieve precise roller pressure adjustment. This invention can achieve stable roller pressure control, meeting the precision control requirements of high-quality production.

This application discloses a control method and apparatus for an extrusion extruder. The method includes: acquiring a first linear speed preset by the conveyor, a first weight per meter preset by the processing equipment, and a first width preset by the target rubber product during production; determining a first extruded rubber volume per unit time based on the first linear speed and the first weight per meter; substituting the first extruded rubber volume into a first linear relationship between the screw speed and the extruded rubber volume of the extrusion extruder to obtain a first screw speed; substituting the first product width into a second linear relationship between the extrusion width of the extrusion extruder and the width of the rubber product processed by the processing equipment to obtain a first extrusion width; and controlling the extrusion extruder to perform rubber extrusion based on the first screw speed and the first extrusion width. This application solves the technical problem that the manual adjustment of the extrusion extruder's operating parameters is required during rubber product production, resulting in low efficiency and difficulty in ensuring product quality.

This invention discloses a big data-based method for quality control in the production of supercritical foamed materials, belonging to the field of manufacturing quality control technology. This big data-based method acquires time-series data and secondary mapping data on barrel temperature deviation, melt pressure fluctuation, and screw speed fluctuation during continuous extrusion foaming. Based on these two types of data, it determines the correspondence between the carbon dioxide dissolution rate distribution and the residence time distribution, and generates concentration gradient field characterization data. After fusion, it obtains fused feature data, inputs it into a degradation trend identification model, outputs the degradation trend of dissolution uniformity inside the barrel, and determines the risk of finished product quality defects. This invention simultaneously collects process time-series data and secondary mapping data reflecting the internal state of the melt, generates concentration gradient field characterization data, and fuses and models it to identify the degradation trend and risk status of dissolution uniformity. It locates the data source deviation before defects form, providing a traceable decision-making basis for production quality control.