Method for operating a shearing and compacting press and shearing and compacting press

A method for operating a shearing and compacting press for producing a pressed package from waste material, comprising the steps of:

• a first compacting step for pre-compacting supply material to a predetermined width of the pressed part using a first compressor which is non-adjustably guided substantially horizontally on a substantially parallel plane in a filling chamber at a continuously applied force, supply material projecting over the first compressor is sheared when the first compressor and a shearing knife disposed thereon are moved towards so as to contact a shearing edge shearing excess supply material therebetween, the substantially parallel plane substantially eliminating tilting movement of the first compressor during shearing until a final position of the first compacting step;
• a second compacting step for intermediate compacting the supply material that has been pre-compacted to the width of the pressed part to a predetermined height of the pressed part using a second compressor non-adjustably guided along a substantially parallel plane in a pressure chamber in a direction substantially perpendicular to the filling chamber towards an end position of the second compacting step;
• a third compacting step for final compacting of the supply material to a predetermined length of the pressed part using a third compressor guided in a package chamber substantially horizontally and in a direction substantially perpendicular to the filling chamber, the first compressor being in a position unblocking an opening of the package chamber when the third compressor is returned to a position in which falling material does not interfere with stroke movement of the third compressor, wherein the first, second and third compacting steps are controlled by a drive system producing a hydraulic pressure;
• and
• ejecting the pressed part through the opening of the package chamber;
• wherein pressure applied to the respective compressors at the beginning of stroke movement and during return strokes is below a maximum available pressure, a maximum attainable pressure being applied to at least one of:
• (i) the first compressor during shearing operation and (ii) the second and third compressors at end positions of the respective pressing operations;
• and automatically controlling the pressing pressure for the compressors based on a degree of compression and the respective length of the pressed package so as to control the compression process until the third compacting step is completed.