High quality fibers from wood chips are the prerequisite for the production of first-class MDF-boards, HDF-boards, panels, laminates, furniture fronts and insulating materials. In 1975 already, Pallmann developed the pressurized refiner system PR. It has been continuously developed further until today. The result is a pressurized refining system which produces first-class fibers. Combined with precutting the wood into chips by means of the drum chipper or the disc chipper, feeding systems and the chip washing system, it provides a complete package for the economic production of the required raw materials.