Abstract: The invention relates to a cutting machine, in particular a tread cutting machine, having at least one cutting blade (8) linearly traversable on a blade carriage (1) for achieving a feed movement and rotationally driven by a motor (2), the motor (2) for the drive of the cutting blade (8) being arranged outside the blade carriage (1), and a torque-transmission means, which comprises a means for transmitting tensile forces, being provided between the motor (2) and the cutting blade (8), and that part of the torque-transmission means which is traversable with the blade carriage (1) having a markedly lower mass than the motor (2). In this case, the motor (2) is provided with a device which is designed as a closed-loop control or an open-loop control and is intended for keeping the rotational speed of the cutting blade (8) at least approximately constant during a feed movement of the cutting blade (8).

Abstract: An underwater pelletizer for granulating thermoplastics, includes an extruder having a die plate with holes for extruding thermoplastics in the form of single strands which are cut by a rotating cutting tool in short pieces in a cutting plane in parallel relation to an exit plane of the die plate, thereby forming a granulated product. The exit plane of the die plate and the cutting tool are positioned in a chamber which is filled with cooling water streaming through the chamber. The chamber has a cooling water inlet, which is arranged above the pivot axis of the cutting tool, and an outlet, arranged beneath the pivot axis of the cutting tool, for discharge of a mixture of water and granulated product, whereby the outlet is configured as free discharge opening which opens into a separator, positioned immediately underneath the outlet, for separating the granulated product from the cooling water.

Abstract: Continuous fibers are led through a roller nip which is formed between a pair of wetting rollers which are driven in opposite rotational directions and the surface of which has a coating of the flowable plastic material in a thickness which is sufficient for the constant filling of the roller nip with the plastic material. The wetted fibers are fed to the plastic material in the extrusion chamber, and the continuous fibers are mixed with the plastic material in the extrusion chamber. A device for carrying out the method includes a screw-type extruder having an extrusion chamber surrounded by an extruder barrel which has, in addition to the entry opening and the exit opening for the extruded plastic material, a lateral opening for the feeding in of continuous fiber material, and a wetting device for the wetted fiber material to be fed in, the outlet of which is in transporting connection with the lateral opening.

Abstract: A slot die for producing webs of a foamed plastics material, into which die plastics material which has been plasticized under elevated pressure in an extruder and charged with a blowing agent enters, and through the die gap of which the plastics material is extruded by foaming. The die gap is formed by a pair of rollers mounted in a laterally sealed manner in the slot die. This achieves the effect that an advantageous formation of outer layers already occurs ahead of the die gap before the start of foaming.

Abstract: Apparatus for withdrawing at least one screw from the barrel of a screw extruder in conveying direction of the screw extruder, with the screw defining a longitudinal axis and terminating in a screw cap, includes at least one gripper having a free end for attachment of a pull mechanism and a grabbing end for interaction with an undercut of the screw cap. The grabbing end is formed with a plurality of radially resilient clamping segments for formation of a hollow cylinder having an inner diameter, which substantially corresponds to an outer diameter of the screw cap, and an outer diameter which is smaller than a diameter of a bore of the barrel.