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Twin-screw extruder manufacturers explain to you what are the characteristics of the principle of twin-screw extruders

by:TENGDA     2023-02-01
Twin-screw extruder manufacturers, plastic machinery manufacturers and scientific research departments have conducted in-depth research on twin-screw extruders, and have clear standards and evaluations for its working principles and processes. However, for Twin-screw extruder, there are still many places worthy of research. The twin-screw extruder has the extruder principle of the single-screw extruder: solid conveying, melting, pressurizing and pumping, mixing, stripping and devolatilization, but not purely so. The research on the theory of twin-screw extrusion started late, coupled with its many types, complicated screw geometry, and complicated extrusion process, which brought many difficulties to the research.

On the whole, the research on twin-screw extruder theory is still in the initial stage, which is the so-called 'skills are more than science'. From the study of its extrusion process, the twin-screw extruder is roughly divided into three links:

1. The change law of the polymer state during the extrusion process, the principle of conveying, the truth and law of the conveying and exhausting of the solid melt, and the establishment of a mathematical physical model, which is used to guide the design of the twin-screw extruder and the extrusion process. optimization.

2. It is necessary to find out the real state change of two or more polymers and materials during the extrusion process, the mixing form, the process of structural change, and the relationship between the final mixture and its performance.

3. As a twin-screw extruder, the internal relationship between the reaction process, speed, performance, screw configuration and operating conditions during extrusion reaction molding is established to guide reaction molding extrusion.

Working principle of twin-screw extruder:

1. The length-to-diameter ratio of the twin-screw extruder screw refers to the ratio between the effective length and diameter of the screw, generally between 7 and 18, and the length-to-diameter ratio is variable.

2. The steering of the screw of the twin-screw extruder can be divided into the same direction and different directions. The same direction is generally used for mixing, and the opposite direction is generally used for extruded products.

3. Drive power, the unit is kw, refers to the power of the motor that drives the screw.

4. Rotational speed range, the range allowed by the low rotational speed of the rod to the high rotational speed, the twin-screw extruder can rotate at high speed, while the rotating extruder with different directions can only operate at a rotational speed of 0-40r/min.

5. The nominal diameter of the screw of the twin-screw extruder is the outer diameter of the screw. The diameter of the screw is a variable value. The greater the processing ability of the machine, the larger the nominal diameter of the screw.

6. Output. It is the amount of material extruded per hour.

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