Abstract: The invention relates to a die plate (1, 1a) for a pelletizer head (10) of an underwater pelletizer for pelletizing plastics. The die plate (1, 1a) has through openings (3) for the passage of plastic melt and nozzles (2) inserted in the through openings (3). At the exit-side ends of the through openings (3) there is provided respectively a shoulder (5) which projects into the respective through opening (3). The nozzles (2) are narrowed at their exit-side end regarding the outside cross-section and with the thus formed front surfaces (4) rest on the shoulders (5) of the through openings (3). The front surfaces (4) of the nozzles (2) can in particular be configured essentially spherically, so that the contact surface (7) and thereby a heat flow between the nozzles (2) and the die plate (1, 1a) is minimal.

Abstract: A novel apparatus is described for granulating plastic strands (4) which emerge from nozzles (3) in molten form and are supplied to a following, downward inclined runoff channel (1) in which the plastic strands are transported by a liquid stream, in particular water stream. Further the apparatus has a dewatering zone (1b) for the plastic strands (4) and a granulator (6) disposed after this dewatering zone. Between the dewatering zone (1b) and the granulator (6) there is at least one tempering zone (9) comprising a rigid, unmoving channel (15) and integrated transport rolls (16) for the plastic strands (4) and having a length such that the temperature differences of the plastic strands (4) across their cross section are largely equalized during their holding time in the tempering zone (9).

Abstract: A device for cooling and granulating strands of plastic which emerge in molten form from dies (3) before being fed, either directly or via a chute (22) which can be positioned underneath the dies and has a cooling water supply, to a subsequent flow channel (1) which has at least one device for producing a stream of coolant. From the flow channel (1) the strands (4) are fed into a granulator (16) which is provided with at least one blade system comprising a rotating shearing blade (13) and a counterblade (12) and used for granulating the strands (4). The device is without a pair of feed rollers as an assembly belonging to the granulator (16) but has a pair of draw-off rollers (20, 21) at the end region of the flow channel (1).

Abstract: An apparatus for cooling, drying and granulating plastic strands emerging from a nozzle in molten form includes a discharge channel washed with cooling water through which the plastic strands are conducted. A draining and drying device forms a separate unit following the lower end of the discharge channel and has a device subjecting the plastic strands to an air stream and a water collecting apparatus disposed under the plastic strands. A granulator follows the draining and drying device.