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How to maintain twin screw extruder and its application in biological materials

Date:2020-03-28

The twin-screw extruder has great application in our plastic granulation. The twin-screw extruder is moved by its batch and large-scale operation. The production efficiency of the twin screw extruder is particularly high. It is also particularly convenient for users. However, after using the twin-screw extruder for a period of time, we found that the granulation effect is not very good and it is not very powerful. At this time, we need to maintain and use the twin-screw extruder.
1. After the twin screw extruder has been used for 500 hours,
Gear wear will be very serious. A large amount of iron filings are stored in the interior of the machine, and we need to clean it regularly. After cleaning, we need to lubricate the gears.
2. After using the twin-screw extruder for a period of time, we need to do a comprehensive inspection of the machine to prevent any loosening of the screws.
3. If there is a power outage, we need to preheat the main control device.
4. After we have used the twin-screw extruder for a period of time, we must check whether the pointer of the meter is intact.
When processing materials, the twin-screw extruder uses a screw in the barrel to complete the conveying, mixing and pumping. The modularity of the cartridge facilitates the segmented transportation of individual monomer operations along the length of the cartridge. The barrel uses electronic heating and liquid cooling, and acts as an independent temperature control zone. The segmented originals are combined on a large torque shaft to optimize the configuration of the screw according to the process requirements. Typical length-to-diameter ratios (L / D) that can be used for reactive extrusion and / or multi-stage removal of volatile solvents range from 32 to 48: 1, with a zui height of 60 L / D (or longer). The electrical energy is converted into mechanical energy by the drive system (motor-gearbox), and then the material is sheared by the rotating screw.
Modular barrel and segmented screw have controllable wiping and pumping characteristics, so that people can adjust the geometry of the screw and barrel to match the requirements of the process task. Solids transport and plasticization usually occur during the * part of this preparation process. Compounding, downstream feeding, liquid injection and ventilation are commonly used, and their principles are determined by the process. The structural configuration of the screw ranges from shear-sensitive to shear-passive.
The twin-screw extruder is a shortage-feed device; its feed rate is determined by the metering equipment. It can be a solid feeder or a liquid feeder. The independence of the output speed of the screw makes it possible to optimize the mixing efficiency by adjusting the shear strength of the twin-screw extruder. In addition, due to the control of the pressure gradient in the extruder and the part is zero during the process, the material can be introduced into the downstream section of the barrel. This is beneficial, for example, in high-filled starch mixes, all feeds cannot be made in one place, or with the same feed temperature and / or shear-sensitive additives (such as natural fibers), if They are reduced when processed over the entire barrel length.

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