Abstract: The invention relates to a method and a device for producing and treating plastic pellets. According to said method, a melt of the plastic material is granulated to give pellets, the pellets are cooled in a cooling fluid, the pellets are separated from the cooling fluid and the pellets are crystallized. The device according to the invention is characterized by comprising a control unit which monitors the crystallization step and controls the method in such a manner that, in case of a disturbance of crystallization, the pellets are supplied to an intermediate storage alter separation of the pellets from the cooling fluid and, as soon as the disturbance is removed, the pellets temporarily stored in the intermediate storage are supplied to crystallization and are crystallized.

Abstract: The invention concerns an extrusion granulator for the granulation of plastic strands gripped by a pair of feed rollers and directed over a slideway in the direction of a cutting rotor with an opposing blade. A guided air stream directed onto the slideway, and deflected perpendicularly towards the cutting rotor by said slideway, impinges on the strands carried on the slideway with such a speed that the strands are held in a parallel orientation by the air stream.

Abstract: The invention relates to a method and a device for producing and treating plastic pellets. According to said method, a melt of the plastic material is granulated to give pellets, the pellets are cooled in a cooling fluid, the pellets are separated from the cooling fluid and the pellets are crystallized. The device according to the invention is characterized by comprising a control unit which monitors the crystallization step and controls the method in such a manner that, in case of a disturbance of crystallization, the pellets are supplied to an intermediate storage alter separation of the pellets from the cooling fluid and, as soon as the disturbance is removed, the pellets temporarily stored in the intermediate storage are supplied to crystallization and are crystallized.

Abstract: The invention relates to a method and a device for producing and treating plastic pellets. According to said method, a melt of the plastic material is granulated to give pellets, the pellets are cooled in a cooling fluid, the pellets are separated from the cooling fluid and the pellets are crystallized. The device according to the invention is characterized by comprising a control unit which monitors the crystallization step and controls the method in such a manner that in case of a disturbance of crystallization the pellets are supplied to an intermediate storage after separation of the pellets from the cooling fluid and as soon as the disturbance is removed, the pellets temporarily stored in the intermediate storage are supplied to crystallization and are crystallized.

Abstract: The invention relates to a rotary cutter for the pelletization of plastic extrudates, said rotary cutter being provided with knives projecting axially away from its end surface, said knives being individually affixed to supporting surfaces of the rotary cutter by means of fastening elements. The supporting surfaces are formed by the side walls of radial grooves in the peripheral surface of the rotary cutter and by radial transverse walls in the radial grooves, said radial grooves being limited by the radial transverse walls, the knives each being inserted in hook-like manner with a projecting portion into said radial transverse walls, wherein one side of the projecting portion forms an abutment for the fastening element, said fastening element penetrating a radial transverse wall and pressing on the abutment.

Abstract: The invention relates to a device for producing pellets from a plastic melt by extrusion, comprising a perforated plate from which the plastic melt is extruded at a pressure above the ambient pressure; a process chamber into which the plastic melt is extruded; a chopping device for chopping strands of the plastic melt extruded from the perforated plate into individual granules, the process chamber being filled with a process fluid; and a pumping device which supplies the process fluid to the process chamber at a pressure above the ambient pressure, the pressure of the process fluid with the therein contained granules being reduced downstream of the process chamber.

Abstract: The invention concerns an extrusion granulator for the granulation of plastic strands gripped by a pair of feed rollers and directed over a slideway in the direction of a cutting rotor with an opposing blade. A guided air stream directed onto the slideway, and deflected perpendicularly towards the cutting rotor by said slideway, impinges on the strands carried on the slideway with such a speed that the strands are held in a parallel orientation by the air stream.

Abstract: The invention relates to a method and a device for producing and treating plastic pellets. According to said method, a melt of the plastic material is granulated to give pellets, the pellets are cooled in a cooling fluid, the pellets are separated from the cooling fluid and the pellets are crystallized. The device according to the invention is characterized by comprising a control unit which monitors the crystallization step and controls the method in such a manner that in case of a disturbance of crystallization the pellets are supplied to an intermediate storage after separation of the pellets from the cooling fluid and as soon as the disturbance is removed, the pellets temporarily stored in the intermediate storage are supplied to crystallization and are crystallized.

Abstract: A machine for producing a nonwoven feeds continuous filaments onto two surfaces that form a convergent passage. At least one of the surfaces is moving to drive the continuous filaments through the passage to form the nonwoven web. The continuous filaments have filament portions that are respectively received on the two surfaces to form spaced lateral web parts joined by a central web part formed by the continuous filament portions bridging the convergent passage. A vacuum is applied through the surfaces to assist placement of the filament portions and to direct the web as it emerges from the passage onto a horizontal take-up conveyor.

Abstract: The invention relates to a cutter wheel for granulating strands of plastic material, said cutter wheel being composed of a plurality of jointlessly juxtaposed wheel portions with individual cutter portions and having axially extending teeth, said teeth forming a continuous cutting edge. The teeth of the cutter portions merge into each other and have such an alternating inclination with respect to the axis of the cutter wheel that there result continuously extending zigzag-shaped cutting edges over the entire cutter wheel.

Abstract: A machine for producing a nonwoven feeds continuous filaments onto two surfaces that form a convergent passage. At least one of the surfaces is moving to drive the continuous filaments through the passage to form the nonwoven web. The continuous filaments have filament portions that are respectively received on the two surfaces to form spaced lateral web parts joined by a central web part formed by the continuous filament portions bridging the convergent passage. A vacuum is applied through the surfaces to assist placement of the filament portions and to direct the web as it emerges from the passage onto a horizontal take-up conveyor.

Abstract: A process for the continuous drying of water-surrounded granulate transported by a screen-type belt conveyor. In a first conveying region in the form of a chute, water is withdrawn under gravity from the plastic granulate at a temperature of > than 100° C., wherein, in a following second region on a belt conveyor, any remaining water is substantially removed by air extraction through the belt conveyor, the air extraction taking place at an air speed of > than 20 m per second and with a dwell time in the second region of < than 2 seconds, there being a following third region, as an evaporation zone, with a dwell time of more than two seconds.

Abstract: The invention relates to a rotary cutter for the pelletization of plastic extrudates, said rotary cutter being provided with knives projecting axially away from its end surface, said knives being individually affixed to supporting surfaces of the rotary cutter by means of fastening elements. The supporting surfaces are formed by the side walls of radial grooves in the peripheral surface of the rotary cutter and by radial transverse walls in the radial grooves, said radial grooves being limited by the radial transverse walls, the knives each being inserted in hook-like manner with a projecting portion into said radial transverse walls, wherein one side of the projecting portion forms an abutment for the fastening element, said fastening element penetrating a radial transverse wall and pressing on the abutment.

Abstract: The invention relates to a device for granulating thermoplastic materials with a die plate and a rotary cutter head, said rotary cutter head carrying cutter knives and being positioned in front of said die plate in a water chamber, said rotary cutter head being centered by means of a rocker bearing and being connected in rotationally fixed manner to an axially displaceable drive shaft through a torque transmitting element, the torque transmitting element being in the form of a tubular slotted spring surrounding the drive shaft, said slotted spring connecting the end of the drive shaft facing the rotary cutter head to the rotary cutter head in the peripheral region of the rocker bearing, said rocker bearing being disposed between the end of the drive shaft and the rotary cutter head in the radial direction.

Abstract: A method for manufacturing a crystallizable plastic material is disclosed. The process includes the step of melting an amorphous plastic material, pelletizing the material, crystallizing it and then post condensing the plastic material with the proviso that the plastic material is not subjected to heating after the melting step but prior to the crystallization step and then subjecting the plastic material to sieving after the crystallization step.

Abstract: The invention relates to a granulator for producing granulate from molten plastic with a cutter head displaceable over an adjustment range, said cutter head cooperating with a die plate dispensing the plastic strands, said cutter head being connected to a drive shaft of a drive motor containing a stator and a drive rotor and being axially displaceable with respect to the die plate. The drive rotor is axially displaceable over the adjustment range by means of a linear adjustment element and is fixable in said range.

Abstract: The invention relates to a melt-blow head with a rectilinear row of nozzle bores arranged in a nozzle bar, said nozzle bores serving to produce endless filaments formed from a melt, said nozzle bores being associated with blowing slots, in the form of longitudinal slots, of two slot-plates for feeding blowing air at an angle to the nozzle bores and to which nozzle bores the melt is fed through one or more distributors in the melt-blow head, the distributor(s) being supplied with the melt through a feeding pipe. The feeding pipe in the melt-blow head leads from a lateral inlet via a redirecting means in an essentially vertical direction to the distributor, said inlet being connected to a melt pipe through a removable connector, the nozzle bar being fixed in a defined position with respect to the slot-plates and being removable therefrom in an approximately vertical direction.

Abstract: The invention relates to a process for the continuous drying of water-surrounded granulate transported by a screen-type belt conveyor. In a first conveying region in the form of a chute, water is withdrawn under gravity from the plastic granulate at a temperature of >than 100° C., wherein, in a following second region on a belt conveyor, any remaining water is substantially removed by air extraction through the belt conveyor, the air extraction taking place at an air speed of >than 20 m per second and with a dwell time in the second region of <than 2 seconds, there being a following third region, as an evaporation zone, with a dwell time of more than two seconds.

Abstract: The present invention relates to a device for granulating thermoplastic materials issuing from orifices, said orifices being provided in a substantially circular arrangement in an orifice plate and being swept by blades rotating about a blade carrier shaft, said blades being held by a blade carrier in an oblique position with respect to the radial direction, the blade carrier shaft extending through the centre of the circular arrangement and a cooling medium being supplied to the orifice plate and to the blades for cooling the granulated plastic materials.

Abstract: An apparatus for pelletizing strands of polymer emerging in molten form from dies with a pelletizer, in which apparatus a cooling section carrying a coolant flow and a dewatering section are provided between the dies and the pelletizer, a running-in rest being arranged upstream of the pelletizer, adjoining the dewatering section and provided with at least one air-nozzle arrangement, which is arranged transversely to the running direction of the strands, is designed as a step in the running-in rest and is intended for generating a stream of air directed essentially parallel to the running direction of the strands, which takes with it the strands supplied to the running-in rest.