When operating a double screw extruder. We must grasp the control of the machine in place, do not use the wrong operation method, or do not stop the machine in the correct way. If the stop sequence is wrong, it will cause great harm to the machine. In the article, we introduced the correct stop sequence of the double screw extruder in detail, as well as the solutions to its common abnormalities. If you are interested, then follow us to find the answer in the article!
1. First, we need to feed the double screw extruder. Conventional extruders have feeders or feed systems. When using a multi-feed system, it is necessary to stop each auxiliary feeder.
2. If the double screw extruder has a vacuum exhaust system, we need to close the valve of the vacuum pipeline, and then open the upper cover of the vacuum chamber.
3. The screw of the double screw extruder cannot stop rotating directly, and the method of gradually reducing the rotation speed of the screw should be adopted to remove the residue in the barrel as much as possible.
4. When the double screw extruder uses heat-sensitive materials that are easily thermally decomposed as raw materials, replace the remaining materials in the main body with polyolefin materials before stopping, and stop the main body after the material is basically discharged.
5. Stop the main motor cooling fan, oil pump, vacuum pump and pump of the double screw extruder in turn. Cut off the power switch of each heater on the electric meter control panel, and stop auxiliary equipment such as pellet mill.
1. The particles produced by the extruder are too fine or too coarse
This situation is well solved. Generally speaking, the production speed of the dual screw extruder matched with the production line is inconsistent with the cutting speed of the pelletizing. Therefore, under the premise of achieving the required production capacity, the pelletizing can be reduced or increased. machine speed.
2. The particles are flat
There are generally two reasons for this situation in the production process of the dual screw extruder, and the abnormality can be solved from two aspects. First check the temperature of the water cooling, and judge the water cooling effect by whether the front material is soft. If there is no problem with the water cooling effect, you can adjust the air pressure and spring pressure of the pelletizer.
3. Frequent disconnection
The speed of the pelletizer may be too fast, you can adjust the speed to solve it first, if it can't be solved, you can consider poor plasticization of the material or too many impurities in the material.
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