Abstract: A pneumatic compressor for the compression of waste comprising a cylinder (1) with a piston (2), which via a piston rod (4) activates a compression plate (3), which is slidably mounted in a compression chamber (5) which has a top door (6) through which waste paper is thrown into the compressor, and a bottom door (7) through which a finished bale can be taken out, which compression takes place in a series of compression cycles, which each time is charged with a new portion of waste, until the waste offers a counter pressure corresponding to the pressure which the piston (2) can exert at a pressure of 8 bars. In 80-90% of the compression cycles necessary for the compression of a bale, the piston (2) reaches its bottom position in the cylinder, and each time the pressure reaches a pressure of 8 bars in the cylinder (1).

Abstract: A pressing cylinder, preferably for use in a refuse compressor, which when in use is preferably in a vertical position, and at the bottom is coupled to a pressing plate and at the top to a secured top plate and which can activate the pressing plate in upward and downward directions, includes preferably three cylinder sections, a first, lower cylinder section which at the bottom is attached to the pressing plate, a second, intermediate cylinder section which can be displaced telescopically in the cylinder's longitudinal direction on the first cylinder section, and a third, upper cylinder section which at the top is attached to the top plate, and which can be displaced telescopically on the second cylinder section. The cylinder can have a large diameter and operate at a correspondingly low working pressure and can therefore have a small wall thickness or be produced of materials other than steel. The pressing cylinder consequently becomes light, easy to operate and cheap to produce.