Method for removing impurities from shredded plastic

摘要

A method for removing impurities from shredded plastic uses a device having a first and second cleaning disc with a first and second cleaning surface respectively. The cleaning surfaces lie opposite each other and border a cleaning gap between each other. The cleaning discs are rotated and liquid is fed into the cleaning gap. Shredded plastic is fed between the cleaning discs and conveyed through the cleaning gap, and the shredded plastic is processed abrasively by the cleaning surfaces. The temperature difference of the liquid guided through the cleaning gap during entry into the cleaning gap and the temperature of the liquid as it exits the cleaning gap and/or at least one parameter characterizing this temperature difference is measured. The distance between the cleaning surfaces is set such that the measured temperature difference and/or the at least one parameter characterizing this temperature difference achieve a setpoint value.

主权项

1. A method for removing impurities from shredded plastic using a device, which comprises a first cleaning disc (10) with a first cleaning surface (12) and a second cleaning disc (40) with a second cleaning surface (42), wherein the cleaning surfaces (12, 42) lie opposite each other and border a cleaning gap (44) between each other, the method comprising the following steps:
at least one of the cleaning discs (10, 40) is rotated around its rotational axis, liquid is fed into the cleaning gap (44), shredded plastic to be cleaned is fed between the cleaning discs (10, 40) and conveyed through the cleaning gap (44), wherein the surfaces of the shredded plastic are processed abrasively by the first and second cleaning surfaces (12, 42), a temperature difference between a temperature of the liquid guided through the cleaning gap (44) during entry into the cleaning gap (44) and a temperature of the liquid guided through the cleaning gap (44) during exit from the cleaning gap (44) and/or at least one parameter characterizing this temperature difference is measured, the measured temperature difference is compared to a setpoint value for the temperature difference and/or the measured parameter characterizing the temperature difference is compared with a setpoint value for the parameter characterizing the temperature difference, depending on a deviation between the measured temperature difference and the setpoint value for the temperature difference and/or between the measured parameter characterizing the temperature difference and the setpoint value for the parameter characterizing the temperature difference the cleaning gap is reduced or increased such that the measured temperature difference and/or the at least one parameter characterizing this temperature difference comes as close as possible to the respective setpoint value.