Abstract: A device and a method for producing pellets from a melt, having a perforated plate with melt nozzles located therein from which nozzles the melt emerges. The perforated plate is located opposite a cutter arrangement with a cutter head with at least one blade, and a cutter shaft driven by a motor so that the at least one blade passes over the melt nozzles in the perforated plate in a rotating manner and in doing so severs pellets of the melt material emerging there. The cutter shaft is at least axially displaceable relative to a process chamber housing by means of at least one adjustable bearing. The position of the at least one blade can be determined and adjusted using a position sensing and adjusting device.

Abstract: The invention relates to a cutting device for a granulator for obtaining granules from cutting plastic strands which are discharged from nozzles, said cutting device comprising a cutting rotor which is connected to the drive shaft by means of a Cardan joint piece comprising a driven part and a drive part. Said drive part and the driven part comprise a force transfer piece, respectively having a prong like shape such that the prongs rotate about the force transfer piece when they are pivoted at about 90 degrees in relation to each other. Each prong supports the axis which extends through the force transfer piece and both axes are offset in relation to each other essentially about 90 degrees.

Abstract: An apparatus for drying pellets having a housing and a rotor with rotor blades that is arranged in the housing such that it can be driven in rotation, having a dewatering region with at least one dewatering screen with dewatering screen openings that are smaller in size than the pellets, so that the process fluid can be separated from the pellets by means of passage from a screen front to a screen rear, wherein an auxiliary blower is arranged such that an auxiliary airflow from it is imparted in the direction of the pellets' primary direction of movement through the housing.

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.

Abstract: The invention relates to a method and a device (01) for dewatering and drying a mixture made of plastic granulate and water, having at least one mixture intake (02), through which the mixture is supplied to the device (01), having at least one water outlet (08), through which the precipitated water is removed from the device (01), having at least one granulate outlet (13), through which the dried granulate is removed from the device (01), the device (01) having a dewatering line (06), along which the mixture is dewatered, and the device (01) having a drying line (12), along which the dewatered granulate is dried.

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. The melt extraction aperture can be configured to align with the nozzle apertures in the nozzle plate and a melt extraction channel.

Abstract: A device for producing pellets that has a perforated plate for extruding a melt into a process chamber, and a cutting device for cutting the melt into pellets. The process chamber can have an inlet and an outlet. A conveying device can deliver a process fluid through the inlet, and carry the process fluid and pellets through the outlet. The inlet can have an inlet opening and an inlet channel. A three-way valve can be located between the inlet channel, a process fluid supply line, and a process fluid discharge line, and below the inlet. The outlet can have a discharge opening and an outlet channel. A pneumatic device can provide compressed air to the process chamber for emptying and expelling the process fluid.

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 process for production of polyethylene terephthalate pellets includes the steps of: production of a melt of polyethylene terephthalate material; production of polyethylene terephthalate pellets from the melt by means of underwater pelletization into a process fluid; removal of the polyethylene terephthalate pellets from the site of underwater pelletization in the process fluid; crystallization of the polyethylene terephthalate pellets in the process fluid, wherein a surface of the polyethylene terephthalate pellets is crystallized and an interior of the polyethylene terephthalate pellets remains amorphous.

Abstract: The invention relates to a method and a device for producing plastic granulate, having a granulator which breaks up essentially continuously conveyed plastic mass flow into granulate particles, the granulator (17, 40) comprising a cutting unit (21, 22; 32, 33, 34), whose cutting elements engage on the plastic mass flow when breaking up the plastic, and the device (1, 31) comprising at least one oscillation sensor (24, 25; 60, 61), using which oscillations occurring on the device (1, 31), in particular on the granulator (17, 40), may be detected.

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 granulating plastic having a high softening temperature, in particular of above 120° C., using a perforated plate for producing strands of molten plastic and a subsequent process chamber containing a process fluid and including a chopping device, from which a mixture of process fluid and granulate is then discharged into a cooling section for cooling said granulate. The process chamber is filled with a process fluid, in particular water, at a temperature of more than 120° C. and at a pressure of over 2 bar, and the mixture of process fluid and granulate, whose pressure will be maintained as it passes through the cooling section, will then be supplied to a separator in which the granulate, which has first been directed through a pressure lock for bringing it down to ambient pressure, will then be separated from the process fluid and discharged.

Abstract: A granulating device for producing pellets from a plastic material can have a die plate, a cutting chamber housing adjoining the die plate, and a cutting device with a cutter. The cutting device can be driven via a cutter shaft by a cutter drive device located in a cutter drive housing. The cutting chamber housing can have a cutting chamber housing flange section connected with a cutter drive housing flange section of the cutter drive housing by a connecting element. The connecting element can have a clamping collar arranged to enclose at least one section of the flange sections, and an eccentric closure element. The eccentric closure element can be connected to the clamping collar, and can have an index opening. In a closure position, the index opening can be located in alignment with a locating pin that passes through the index opening.

Abstract: A device for granulating melt emerging from nozzles can have a perforated plate. A cutter arrangement with at least one cutter can be driven by a motor opposite the perforated plate, such that the at least one cutter passes over the nozzles in the perforated plate to sever pellets of the emerging melt material. The device can include a housing that connects to the perforated plate and surrounds at least one cutter. A coolant can flow through the housing. The device can include an inlet disposed in a lower half of the housing. The inlet can have an inlet opening connected to an inlet channel for allowing coolant to flow into the housing and an outlet can be in fluid communication with the housing.

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 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: A cutter head holder for blades of an underwater granulator for granulating pellets from a plastic melt that emerges from a perforated plate into a process chamber of a housing of an underwater granulator.

Abstract: The invention relates to a method and a device for producing plastic granulate, having a granulator which breaks up essentially continuously conveyed plastic mass flow into granulate particles, the granulator (17, 40) comprising a cutting unit (21, 22; 32, 33, 34), whose cutting elements engage on the plastic mass flow when breaking up the plastic, and the device (1, 31) comprising at least one oscillation sensor (24, 25; 60, 61), using which oscillations occurring on the device (1, 31), in particular on the granulator (17, 40), may be detected.

Abstract: An apparatus for drying pellets having a housing and a device for impressing motion. The device impresses directions of motion on the pellets and on a process fluid that differ locally from one another, so that the process fluid in which the pellets are originally located can be separated. The pellets by means of passage from a screen front to a screen rear in a dewatering region with at least one dewatering screen having dewatering screen openings that are smaller in size than the pellets. A classifying region with at least one classifying screen with classifying screen openings that are of such a size that the pellets of a desired size pass from a screen front through these classifying screen openings to a screen rear, wherein the classifying screen is arranged such that the pellets with the direction of motion impressed upon them pass through the classifying screen openings.

Abstract: A cutter bar of a cutting device for producing pellets from strands of material that emerges from a perforated plate in one or more strands of material and is cut into individual pellets by the cutting device, having at least one cutting edge. The cutter bar can have a serration on at least one strand contact surface, and the serration can have a preferential direction that is inclined at an angle relative to the cutting edge.