Abstract: Knife arrangement for a granulator for granulating plastic ropes with two draw-in rollers and a cutting rotor (9) cooperating with a counter-knife (2), and a striper (3) facing one of the draw-in rollers (11), whereby counter-knife (2) and striper (3) are mounted on a common support, whereby the striper (3) is arranged adjustably for adjustment of the distance between the striper (3) and the draw-in roller (11), and whereby the striper (3) has a support surface (6) for feeding the plastic ropes (12) to the counter-knife (2) and the cutting rotor (9), and is provided on one side with a striper edge (18) projecting towards the draw-in roller (11), and on its other side with an end edge (7) projecting towards the counter-knife (2), whereby the support (1) has a support surface (4) facing the striper (3), on which the striper (3) rests with a counter surface (5) adapted to the support surface (4), whereby support surface (6) and counter surface (5) approach each other towards the counter-knife (2) in a wedge-shap

Abstract: Pelletizing device for cutting plastic fiber strands into pellets, having a strand-feeding device and a cutting rotor, which is driven by a drive system and has cutting blades distributed over its rotor circumference, the root areas of which blades are arranged in grooves in the rotor body, each cutting blade having at least one recess parallel to the cutting edge, which recess is covered by the groove and interacts with a clamping element which is supported against the rotor body, in which device the clamping element is a slotted clamping sleeve, the cylindrical outer contour of which is of the same shape as the recess in the cutting blade.

Abstract: In a melt spinning apparatus, cooling system with a blower nozzle with slit-shaped outlet openings is used which is directed upon the yarns emerging from the spinning nozzle. The blower nozzle is provided with a bend immediately before its outlet opening through which the air stream is directed to the output of the yarns from the spinning nozzles. The bend is designed so that a rapid and effective cooling of all the extruded filaments takes place, even with a nozzle package with a large number of perforations, without having to provide several blower nozzles. A narrowing at a given distance before the outlet opening ensures even distribution of the flow profile produced over the entire outlet cross-section of the blower nozzle. Furthermore, the spinning nozzles are assigned an induction heating system in which induction coils are placed above the area over which the spinning nozzles extend.

Abstract: In a melt spinning apparatus, cooling system with a blower nozzle with slit-shaped outlet openings is used which is directed upon the yarns emerging from the spinning nozzle. The blower nozzle is provided with a bend immediately before its outlet opening through which the air stream is directed to the output of the yarns from the spinning nozzles. The bend is designed so that a rapid and effective cooling of all the extruded filaments takes place, even with a nozzle package with a large number of perforations, without having to provide several blower nozzles. A narrowing at a given distance before the outlet opening ensures even distribution of the flow profile produced over the entire outlet cross-section of the blower nozzle. Furthermore, the spinning nozzles are assigned an induction heating system in which induction coils are placed above the area over which the spinning nozzles extend.

Abstract: For the cooling of melt-extruded filaments of fiber-forming polymers spun from nozzle in molten form, said filaments are exposed to a medium prepared in foam form. The filaments emerging from the spinning nozzle are taken to the cooling area through said foam before passing on to a further process. The cooling medium, consisting of a liquid, is prepared by the addition of a gas.

Abstract: The invention relates to a method for manufacturing a foaming synthetic material, for example, polystyrol, by means of an extruder, in whose entry the synthetic material is fed, to which by means of a fumigation aperture foaming gas in a liquid form, for example pentane, is introduced at a pressure maintaining the foaming gas in its liquid form, whereby throughout a following extruder region, the synthetic material provided with the foaming gas is homogenecised.

Abstract: A nozzle package is connected at its lower end to a heating box by means of elements which permit a good heat transfer to the nozzle plate included in the nozzle package.

Abstract: Apparatus for granulating strand materials including a stationary knife, a rotatable knife, and a drawing-in device. Part of the housing is pivotable to enable the drawing-in device to be easily removed for maintenance. An oblong hole on the housing is used to locate the drawing-in device.

Abstract: A strand caster, in particular for plastic strand casting systems, is provided, which in a known fashion consists of a nozzle plate and a caster. The nozzle plate and the caster include abutment surfaces facing each other, and the nozzle plate is mountable to the caster by corresponding mounting elements. The surface structure of at least one abutment surface of the nozzle plate or respectively the caster is adapted such that, due to the fastened state caused during operation, the one abutment surface accommodates to the opposing other abutment surface under tension so that an uniform surface pressing between the nozzle plate and the caster is achievable.

Abstract: The invention relates to a granulating device for strand materials comprising a pull-in device for feeding the strand material, conducted through an inlet shaft, and transporting it to a knife roll for cutting up the strand material into granulate, said pull-in device having a pull-in roll, and a counter-roll, of which rolls at least one is driveable and both form a inter-roll gap for pulling-in the strand material. A proximity-type switching element is disposed in the region of the inlet shaft, particularly in front of the entrance thereof, said proximity-type switching element raising, when actuated, the setting of the inter-roll gap and increasing the inter-roll gap to such a width that the further pulling-in of the strand material is abruptly stopped.

Abstract: A process for the simultaneous drying and crystallization of crystallizable thermoplastic synthetic material (plastic), e.g. polyethylene terephthalate, in which plastic from the melt is extruded in cord form, solidified at the surface by quenching in water and crystallized by gas treatment and dried, using a device for cooling and drying the cord emerging from dies having a casting gutter with its acceptance end arranged beneath the dies and a device producing a flow of coolant on the casting gutter within a quenching section, a subsequent dewatering section in which the casting gutter has apertures for the free flow of the coolant, a subsequent drying section in which the casting gutter has closely spaced nozzles for the passage of gas and a granulator downstream of the drying section. The lengths of the quenching, dewatering and drying sections must be such, taking account of the rate of creep of the cord along the casting gutter, that the passage time in the quenching section is a maximum of some 1.

Abstract: The heat transmission from the heating box of a spinning beam to the nozzle package carried therein in a nozzle throat is improved in such a way that the fixing device for the package is provided with heat receiving elements. These elements are subjected to saturated vapor in operation and are provided with condensation surfaces so as to receive heat from the saturated vapor. The heat received is transmitted to the package via at least one heat bridge.

Abstract: The invention relates to a granulation apparatus for strand material having pull-in apparatus for gripping the strand material and transporting it to a counter knife, a knife roll cooperating with the counter knife for cutting the strand material into granulate, and a housing accomodating the pull-in apparatus, the counter knife and the knife roll, wherein a motor driving the knife roll and the pull-in apparatus is arranged beside the housing and is connected by means of a drive axle to the rotating components contained in the housing, and wherein the motor and the housing are mounted on a common support.

Abstract: The invention refers to a cutting strip with a cutting edge of highly wear-resistant material, e.g., polycrystalline diamond material, that is laid in solid connection on a base and forms a rail piece together with this base, whereby several rail pieces are laid in series along a holder that is made of wear-resistant material, e.g., hard metal, and has an essentially rectangular cross-section. The holder is provided, along two adjacent edges each with a groove protruding diagonally into the holder, with essentially parallel faces into which the rail pieces are inserted in such a way that the faces of the two grooves reach to the cutting edge of the rail pieces, whereby the faces situated between the two grooves are formed by a clamping piece that can be screwed onto the holder and that collectively clamps against the holder all rail pieces held in the two grooves.

Abstract: The invention concerns a closable extrusion nozzle for thermoplastic materials, with a nozzle plate (4) containing nozzles permitting the extrusion of the thermoplastic material from a hopper (1) and with a perforated plate (7), disposed upstream of the nozzle plate, whose apertures (8) can be brought in and out of alignment with the nozzles by displacing the perforated plate (7) with respect to the nozzle plate (4). The nozzle plate (4), which is U-shaped in cross-section, with the arms of the U at right angles to the direction of displacement of the perforated plate, is designed as a housing for the perforated plate (7) enclosed within it.

Abstract: A device for cooling, granulating and drying molten strands of synthetic thermoplastic material emerging from dies includes a cooling unit for applying a cooling liquid to the strands and a granulator housing with a cutting roll for granulating the strands. The granulator housing is connected to an outlet duct with a sieve to separate the thermoplastic material from the cooling liquid. The sieve is arranged so that the granules separated from the strands by the cutting roll impinge directly on the sieve at basically the same speed as that imparted to the granules by the cutting roll.

Abstract: A process for purifying exhaust gases, especially from vacuum pyrolysis installations by means of the extraction of the exhaust gases and their combustion with a supply of air. Immediately after their formation, the exhaust gases are subjected to complete combustion with a controlled air supply and an under pressure of 0.5 to 0.95 bar (500 to 50 mbar absolute) generated by a vacuum pump, whereupon the gaseous reaction products are cooled to 10.degree. to 25.degree. C. to prevent damage to the vacuum pump and then the cooled gaseous reaction products are extracted by the vacuum pump.

Abstract: A device for cooling and granulating molten thermoplastic strands (1) emerging from dies (2) which either drop along the falling line starting at the dies or are guided in an operating position through a coolant bath (9), freely stressed between guide rollers fitted in the bath and then taken into a granulator (4). In the region between the dies and the coolant bath there is a precooling device (5) which carries the plastic strands emerging from the dies and takes them to the coolant bath. Behind the precooling device there is a gripping device (21 ) with opposed clamping rollers (41, 42) which can open and shut and move along a guiding rail to grip the forward ends of the plastic strands after they have been separated by a separator (22) movable through the falling line of the strands. The rollers with the forward ends of the strands are moved along the guiding rail running through the region of the coolant bath as far as the granulator, where they release the strands thereinto.