During the extrusion production process, the extruder screw/suddenly jammed may not rotate. At this time, if the extruder protection device does not work, the operator should shut down immediately. In more cases, the screw/can still rotate, but the speed slows down, and at the same time there is a harsh metal scraping sound, and the current rises sharply. At this time, the operator should stop immediately.
The reasons for this situation are:
1: Foreign matter enters the barrel and jams the screw. If it is a ferrous metal foreign matter, it will cause great damage to the screw and the barrel.
2: The screw or barrel is deformed
3: The barrel temperature is too low, or the filter plate is blocked, causing the barrel pressure to rise sharply, causing the screw to deform
4: The screw barrel design is unreasonable, and it is easy to happen that the compression ratio of the screw design is too large, and the screw/ is deformed during use.
5: The thermal expansion coefficients of the barrel and the screw/material used are too different. When heating, the barrel feeding seat is cooled, and the screw if it is not cooled, it may lock up.