A method for dissolving and cleaning of containing interfering substances paper tube

The method is used for purifying containing interfering, in particular with heavy parts contaminated or paper pulp suspensions. Here, the suspension (S) in a closed sifter (2) is guided, the wire (3) has a cylindrical or conical shape and is provided with sorting slots (23), which are preferably relatively wide. The method is applied to paper or pulp suspensions, consisting of an open pulper (1) or secondary pulper without further purification or deflaking in the sifter (2) are introduced. The method allows reliable removal of the coarse contaminants while maintaining a high throughput through the sifter (2).