For the proper performance of a continuous working pulper it is required the installation of a cleaning unit such as the TT Ragger, that is capable to extract from the stock a wide range of wire-shaped contaminants such as metal wires, plastic bags, rags, ropes, etc. Thanks to its special design the performance of the TT Ragger is not affected by the size and diameter of the extracted rope that is kept in position by the constant pressure of the top wheel. The operating speed of the TT Ragger can be set in order to optimise the working time in accordance with the quantity of contaminants existing in the processed waste paper.