Abstract: One or more embodiments of a device for avoiding the uncontrolled discharge of melt from nozzle apertures of a nozzle plate are provided. The device can include a locking member that is movable in front of the nozzle plate. The locking member can be formed as an extrudate collection member. The locking member can be reciprocable between a production position and a collection position. And melt can be discharged from the nozzle apertures of the nozzle plate in the form of extrudates into a process chamber when the locking member is in the production position and into extrudate collection member when the locking member is in the collection position. The device can also include a melt extraction aperture disposed on the extrudate collection member.

Abstract: The invention relates to a device for producing pellets from plastic material or from material to be pelletized. Said device comprises a continuous casting device (1) from which at least one strand (2) of the material to be pelletized is issued, and a belt conveyor (3) comprising at least one conveying belt (4) on which the strand (2) can be fed to a pelletizer (5), said pelletizer breaking the strand up into pellets (6). The invention is characterized in that the belt conveyor (3) has a switchable direction of conveyance of the conveying belt (4), a direction of feed conveyance towards the pelletizer (5) and a direction of discharge conveyance away from the pelletizer (5). The invention also relates to a method for operating said device.

Abstract: A shredder for producing particles from a sheet material is disclosed herein. The shredder can have a longitudinal cutting device with a first cutting roller and a second cutting roller. A transverse cutting device can be positioned after the longitudinal cutting device. The first cutting roller and the second cutting roller can each have special profiles.

Abstract: One or more embodiments of a drying apparatus for drying pellets from a process fluid are provided. The drying apparatus can include at least one screen device. The at least one screen device can have a screen area with screen openings. The drying apparatus can also have an oscillating device that sets at least the screen area of the screen device into oscillation. The oscillations can move the pellets relative to the screen openings, and the process fluid can drain off through the screen openings.

Abstract: A drop pelletizing device and method for producing pellets from a low-viscosity plastic melt are provided. The drop pelletizing device can include a die plate with holes, in which the plastic melt can be subjected to a harmonic pressure oscillation such that the plastic melt emerging from the holes forms individual pellet droplets, a pressure vessel, in which prevails an overpressure above the ambient pressure, a discharge device adapted to discharge the individual pellet droplets from the pressure vessel and to reduce the overpressure, a separator adapted to separate the individual pellet droplets from the coolant; and at least one circulating device adapted to agitate the coolant to separated and unclump the individual pellet droplets in the coolant and for producing turbulence within the coolant.

Abstract: The invention relates to a method for the production of pellets of polyamide 6 or copolyamides. The method can include production of a melt of polyamide 6 or copolyamides by means of polymerization, production of pellets from the melt by means of underwater pelletization into a process fluid, removal of the pellets from a site of underwater pelletization in the process fluid, supply of the pellets in the process fluid to an extraction stage, extraction of low-molecular components as extract, and drying of the pellets after extraction, wherein the underwater pelletization stage and the extraction stage take place using the same process fluid. The invention further relates to a device for implementation of such a method.

Abstract: The methods and apparatuses for granulating thermoplastic material emerging from nozzles in a perforated plate are provided. The apparatus can have a motor-driven cutter arrangement having at least one blade located opposite the perforated plate. The at least one blade can pass over the nozzles in the perforated plate and cuts pellets of the emerging thermoplastic material.

Abstract: One or more methods for the manufacture of a die plate of an extruder of a pelletizer for thermoplastic material, with die orifice openings are provided. One or more of the methods can include providing a die plate blank having a die plate base material; producing a functional layer with a reinforcing material in at least one region on at least one side of the die plate blank, and applying the reinforcing material to the die plate base material in the region of the functional layer by laser dispersion.

Abstract: The invention relates to a device for the production of granulate grains from a plastic melt, having a nozzle plate with at least one nozzle opening from which a strand of the plastic melt is discharged into a processing chamber, and a cutting tool having at least one cutting blade that may be moved against the nozzle plate by means of a feed device, wherein the plastic strand discharged from the nozzle opening of the nozzle plate can be fragmented into granulate grains by the cutting blade moving relative to the nozzle opening. The nozzle plate has a diamond coating at least on the surface thereof facing the cutting tool, with the hardness of the diamond coating being greater than the hardness of the cutting blade, and with the average roughness of the diamond coating being greater than the average roughness of the cutting blade by at least a factor of two.

Abstract: The invention relates to a method for granulating and crystallizing thermoplastic polymers, the granules being contained in a liquid after granulation of a polymer melt and the granules being nucleated in the liquid once the pressure of the liquid is increased and the temperature of the liquid is increased, and the granules being crystallized in the liquid once the pressure of the liquid is again increased and the temperature of the liquid is again increased. According to the invention, the granules are removed from the liquid once the pressure and the temperature of the liquid containing the granules have been reduced.

Abstract: The invention relates to a method for the production of granulate grains of polymers from thermoplastic polyesters or copolyesters from a polyester melt using an extrusion granulator. The polyester melt is fed to nozzles of the extrusion granulator and then, with draw-in rollers, to the granulation device via an extraction section as extrusions exiting from the nozzle, wherein, e.g., an extrusion extraction speed is set by the draw-in rollers. The invention also relates to an improved extrusion granulator according to the invention having a wave device between the nozzles and the extraction channel, and granulate grains produced according to the method according to the invention.

Abstract: Methods and devices for machining a die plate of an extruder for pelletization are provided. The device can include a grinding wheel with a grinding surface rotatably disposed on a drive mechanism of a cutter head associated with the extruder. The grinding surface can include a hard coating aligned with the die plate.