Nanjing Rubber & Plastics Machinery Plant

(1) Adjusting the speed regulator screw can be fully compensated pressure fluctuations of extruder.
(2) When the speed regulator screw unchanged, the remaining length of polymer melt can be regulated relying on the stabilized voltage screw, which has a good effect on voltage regulation,but only the largest fluctuations is 83163% in the value of regulation.
(3) [...]

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In the previous studies, a driven method of extruders by variable speed switched reluctance motor drive is put forward. Based on analysis of present states of extruders, the method which could realize flexible numerical control by using variable speed switched reluctance motor to controlling the screw speed on velocity and pressure of extrusion was narrated. [...]

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The screw of an extruder driven by switched reluctance motor can be operated through the gear of the motor, which can realize speed control under extrusion rate and the pressure. Generally, an extruder processes its own characteristics: wide range of speed adjustment, steady speed and high precision, small starting current, large starting torque. Due to [...]

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(3) There is no burning of motor and controller in an extruder with switched reluctance motor when three-phase input power is absent, and it can only lead to decrease of input electrical power output.
(4) During the operation of an extruder, there is no such an error that leads to short-circuit devices and burning controller, caused [...]

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Over the years, it is a problem for stepless speed regulation in maintaining a large screw extruder torque, due to direction changing of DC motor for speed control, small torque of AC motor, and complex mechanical of speed control, continuously variable high cost and low efficiency of the hydraulic motor, along which many new ways [...]

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An extruder drived by a switched reluctance motor has the following advantages:
(1) The speed of screw with long-term operation can be adjusted from zero to the highest speed in the range of stepless speed regulation, with high efficiency and smaller temperature rise of motor and controller.
(2) When an extruder begins to work, [...]

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Extruder, which is currently used, is driven by ordinary motor for screw rotation through the reducer. It is only to reach the volume of screw speed and extrusion by pressing the button down. When changing varieties and specifications of products, the adjustment of the volume of melt extrusion or extrusion rate is necessary to readjust [...]

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The screw speed of an extruder is an important process parameter to control the quality of extrusion rate and products. The pressure of material in the barrel increases as speed changes; while the shear strengthening of materials can improve the material temperature, and reduce melt viscosity, which is conducive to the full material and evenly [...]

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Screw combination is the key to the development of extruding process. Co-rotating twin screw extruder mainly with a mixing extrusion, screw combination need to take into account of the shape of the main performance and accessories, feeding sequence and location, the location of vents, barrel temperature settings and so on. At the same time, with [...]

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Twin screw extruder is characterized as follows: higher speed and in the mating area (in the cross-section of the overlapping part of two screws) there is relative velocity, it can produce a strong uniform shear; Geometry determines that it must be open for its vertical flow channel, so that there is materials exchange between the [...]

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