Abstract: The invention relates to a device for processing material by mixing and/or plasticating, comprising at least two conical screws (2, 3) which are arranged next to each other in a common screw casing (1) and the flights of which engage with one another and are driven to rotate in the same direction of rotation about the respective screw axis (4, 5) by at least one motor, with the material that is to be processed being fed to the screws (2, 3) through at least one feed opening (6) in the screw casing (1) which is arranged in the feed zone (E) of one end face of the screws (2, 3), and with the material that has been processed by the screws (2, 3) leaving the screw casing (1) through at least one outlet opening (7) in the screw casing (1) that is arranged in the discharge zone (A) of the other end face of the screws (2, 3). In order to provide advantageous plasticating conditions it is proposed that the ratio of the numerical values of the screw outside diameter (c, d) to the profile overlap, i.e.

Abstract: An apparatus for the preparation of thermoplastic plastics material to be recycled has two treatment stages following one after the other. At least two receiving containers, which are capable of being evacuated and which are attached in parallel to a receiving container of the second stage, are present in the first stage. A device is present by which an alternating batch-wise charging of the receiving container of the second stage takes place from the receiving containers of the first stage. The said device controls discharge members of the receiving containers of the preceding stage, which leads into a channel. A shut-off member is provided for each receiving container of the preceding stage in the said channel. The alternating device controls the shut-off members. The method of preparing thermoplastic plastics material, to be recycled, utilizes an apparatus of this type.

Abstract: The invention relates to a device for processing material by mixing and/or plasticating, comprising at least two conical screws (2, 3) which are arranged next to each other in a common screw casing (1) and the flights of which engage with one another and are driven to rotate in the same direction of rotation about the respective screw axis (4, 5) by at least one motor, with the material that is to be processed being fed to the screws (2, 3) through at least one feed opening (6) in the screw casing (1) which is arranged in the feed zone (E) of one end face of the screws (2, 3), and with the material that has been processed by the screws (2, 3) leaving the screw casing (1) through at least one outlet opening (7) in the screw casing (1) that is arranged in the discharge zone (A) of the other end face of the screws (2, 3). In order to provide advantageous plasticating conditions it is proposed that the ratio of the numerical values of the screw outside diameter (c, d) to the profile overlap, i.e.

Abstract: The invention relates to an apparatus for extruding thermoplastic material, comprising an extruder screw (2) which is mounted in a housing (1), comprises a plasticizing section (P) on the inlet side, a degasification section (E) upstream of an outlet section (A), a flow arrester (S) between the plasticizing section (P) and the degasification section (E) with a screw section with a counter-rotating delivery flight (3), and at least one flow channel (5) bridging the flow arrester (S) and containing a melt filter (4). In order to reduce the driving power of the extruder screw (2) it is proposed that a sleeve (7), which encompasses the screw (6) and is mounted in the housing (1) in a rotationally fixed manner, is associated with the screw section that forms the flow arrester (S), and the screw (6) in the screw section of the flow arrester (S) has a smaller screw diameter in relation to the plasticizing section (P) and preferably also to the degasification section (E).

Abstract: The invention relates to a device for the extrusion of thermoplastic synthetic material featuring an extruder screw (2) which is mounted on a housing (1) including a plasticizing section (P) at the inlet side, a degassing section which is mounted upstream on a discharge section (A) and a conveying outlet (3) operating in the opposite direction which is located between the plasticizing section (P) and the degassing section (E). A flow channel (5) that contains a melt filter (4) is bridged over by at least one of the conveying outlets (3) in the opposite direction. To create favorable production conditions, the extruder screw (2) forms a similar conveying outlet (7) operating in the same direction between the conveying outlet (3) in the opposite direction and the downstream port (6) of the flow channel (5). The housing (1) has at least one degassing vent (8) at the transition area of the conveying outlet (3) operating in the opposite direction and the conveying outlet (7) operating in the same direction.

Abstract: The invention relates to an apparatus for extruding thermoplastic material, comprising an extruder screw (2) which is mounted in a housing (1), comprises a plasticizing section (P) on the inlet side, a degasification section (E) upstream of an outlet section (A), a flow arrester (S) between the plasticizing section (P) and the degasification section (E) with a screw section with a counter-rotating delivery flight (3), and at least one flow channel (5) bridging the flow arrester (S) and containing a melt filter (4). In order to reduce the driving power of the extruder screw (2) it is proposed that a sleeve (7), which encompasses the screw (6) and is mounted in the housing (1) in a rotationally fixed manner, is associated with the screw section that forms the flow arrester (S), and the screw (6) in the screw section of the flow arrester (S) has a smaller screw diameter in relation to the plasticizing section (P) and preferably also to the degasification section (E).

Abstract: The invention relates to an apparatus for the continuous filtering of impurities from a flowable compound, especially a plastic melt, comprising a filter insert (3) in the form of a hollow rotary body which is held to rotate about its rotational axis (A) relative to a housing (1, 2) and is flowed through by the flowable compound and which is arranged in a flow conduit of the housing (1, 2) between a feed conduit (7) for the compound to be filtered and a discharge conduit (8) for the filtered compound, and a discharge apparatus for impurities held back by the filter, which apparatus comprises a feed screw (9) cooperating with the filter insert (3). In order to provide advantageous constructional conditions it is proposed that the filter insert (3) comprises a disk-like filter (5) which is arranged on the face side of the rotary body and is coaxial to the rotational axis (A).

Abstract: The invention relates to a device for the extrusion of thermoplastic synthetic material featuring an extruder screw (2) which is mounted on a housing (1) including a plasticizing section (P) at the inlet side, a degassing section which is mounted upstream on a discharge section (A) and a conveying outlet (3) operating in the opposite direction which is located between the plasticizing section (P) and the degassing section (E). A flow channel (5) that contains a melt filter (4) is bridged over by at least one of the conveying outlets (3) in the opposite direction. To create favorable production conditions, the extruder screw (2) forms a similar conveying outlet (7) operating in the same direction between the conveying outlet (3) in the opposite direction and the downstream port (6) of the flow channel (5). The housing (1) has at least one degassing vent (8) at the transition area of the conveying outlet (3) operating in the opposite direction and the conveying outlet (7) operating in the same direction.

Abstract: The invention relates to an apparatus for the continuous filtering of impurities from a flowable compound, especially a plastic melt, comprising a filter insert (3) in the form of a hollow rotary body which is held to rotate about its rotational axis (A) relative to a housing (1, 2) and is flowed through by the flowable compound and which is arranged in a flow conduit of the housing (1, 2) between a feed conduit (7) for the compound to be filtered and a discharge conduit (8) for the filtered compound, and a discharge apparatus for impurities held back by the filter, which apparatus comprises a feed screw (9) cooperating with the filter insert (3). In order to provide advantageous constructional conditions it is proposed that the filter insert (3) comprises a disk-like filter (5) which is arranged on the face side of the rotary body and is coaxial to the rotational axis (A).

Abstract: A device for processing material by mixing and/or plasticization or agglomeration has a screw housing, in which at least two screws are situated adjacent to one another. The screw channels are engaged with one another. The screws are driven to rotate by at least one motor. The screws are supplied with the material through an intake opening of the screw housing and the processed material leaves the screw housing through at least one outlet opening. An apparatus is provided, which in operation of the device provides the gap which exists between adjacent screw channels of the screws alternately with a periodic enlargement or reduction, which is superimposed on the rotational movements of the two screws. In the method for material processing, the material, in addition to the compaction which is caused by the conveyance action of the screws, is subjected to periodic squeezing by the screws.

Abstract: An apparatus for filling a screw (7) bearingly supported within a housing (6), in particular of an extruder, for processing of pre-comminuted synthetic plastics material, in particular PET, has a filling opening (5) for the screw housing (6). This filling opening (5) is in flow connection with the lower outflow opening (4) of an upright receptacle 81) for the material to be processed. Within the receptacle (1), tools (30, 31) circulate around a, preferably vertical, axis, which tool act onto the material positioned within the receptacle (1). This material is introduced into the evacuable receptacle (1) through a sluice (60). A quickly circulating tool (30) for creating a mixing cone (71) is disposed between an upper interior portion (68) and a lower interior portion (69) of the receptacle (1).

Abstract: A backwashable filtering device for thermoplastic plastics material is disclosed. The device can filter thermoplastic plastics material through one or more nests of screens in the filtering position, while submitting some nests of screens to the backwashing process that cleans them. The filtering position and the backwashing position are selectable by displacing one or more carrying bodies with respect to a housing and/or by displacing one or more control bodies with respect to the carrying bodies. The backwashing can be performed over an entire nest of screens or over a portion of a nest of screens. The nests of screens can be straight or curved.

Abstract: The invention relates to a device for granulation of an ejected material from at least one nozzle (7), in particular a thermoplastic plastic, with a perforated plate (2) comprising the nozzles (7). A blade head (10) supporting several blades (11) lies opposite the same, fixed to a shaft (9) which is rotatably driven by a motor (13). The motor (13) is suspended such as to be displaced relative to the housing (1) by means of a suspension (15), however the above is suspended in such a manner that displacement is only possible in the direction of the axis (8) of the shaft (9) and not in a radial direction. The suspension (15) comprises at least one membrane (14) which suspends the motor (13) on the granulator housing (1). The motor (13) can be adjusted relative to the perforated plate (2) by means of an adjuster device (27), such that the desired pressure of the blade on the perforated plate (2) is maintained. The excised granulate particles are drawn out of the housing (1) by means of coolant.

Abstract: Device for processing material by mixing and/or plasticization or agglomeration A device for processing material by mixing and/or plasticization or agglomeration has a screw housing (6), in which at least two screws (1, 2) are situated adjacent to one another. The screw channels (7) are engaged with one another. The screws are driven to rotate by at least one motor (3). The screws (1, 2) are supplied with the material through an intake opening (39) of the screw housing (6) and the processed material leaves the screw housing through at least one outlet opening (51). An apparatus (19) is provided, which in operation of the device provides the gap (8) which exists between adjacent screw channels (7) of the screws (1, 2) alternately with a periodic enlargement or reduction, which is superimposed on the rotational movements of the two screws (1, 2).

Abstract: A device for filling an extruder, which can optionally be an external extruder, with pretreated thermoplastic plastics material, in particular PET, has at least one evacuatable container (1) in which moving, in particular rotating, tools (7) are provided for pretreatment of the material. This pretreatment comprises drying and, optionally, crystallisation. Each container (1) has a discharge opening (18) for the flowable material (12), which discharge opening (18), with respect to the material, is fluidically connected to the filling opening (35) of the extruder (36). The device preferably has only a single container stage, the outlet of which is fluidically connected to a coupling (69), which is connectable to the filling opening (35) of the extruder (36), via a transfer section (31) maintaining the flowable state of the material (12) pretreated in the container (1) (FIG. 1).

Abstract: An apparatus for the preparation of thermoplastic plastics material to be recycled has two treatment stages (68, 68) [sic—recte (67, 68)] following one after the other. At least two receiving containers (1, 1?), which are capable of being evacuated and which are attached in parallel to a receiving container (2) of the second stage (68), are present in the first stage (67). A device (70) is present by which an alternating batch-wise charging of the receiving container (2) of the second stage takes place from the receiving containers (1, 1?) of the first stage. The said device (70) controls discharge members (75) of the receiving containers (1, 1?) of the preceding stage (67), which leads into a channel (3). A shut-off member (71) is provided for each receiving container (1, 1?) of the preceding stage (67) in the said channel. The device (70) for the alternating batch-wise charging of the receiving container (2) of the last stage controls the said shut-off members (71).

Abstract: An apparatus for filling a screw (7) bearingly supported within a housing (6), in particular of an extruder, for processing of pre-comminuted synthetic plastics material, in particular PET, has a filling opening (5) for the screw housing (6). This filling opening (5) is in flow connection with the lower outflow opening (4) of an upright receptacle 81) for the material to be processed. Within the receptacle (1), tools (30, 31) circulate around a, preferably vertical, axis, which tool act onto the material positioned within the receptacle (1). This material is introduced into the evacuable receptacle (1) through a sluice (60). A quickly circulating tool (30) for creating a mixing cone (71) is disposed between an upper interior portion (68) and a lower interior portion (69) of the receptacle (1).

Abstract: A strand shaping part for connecting an extruder (1) to a granulating system has a number of supply channels (8) that can be flow-connected to the outlet (5) of the extruder (1). These supply channels lead to gear pumps (21) which have a delivery behaviour that is as constant as possible and with which the flow of melt to channels (11) can be blocked during start up. A single channel (11) leads from each gear pump (21) to a strand die (9) that can be formed by holes of a perforated plate (10) which is connected to a perforated plate head (7). Several gear pumps (21) are driven by a common shaft (24). The method for starting a granulating system provided with a strand shaping part of the aforementioned type provides that the extruder (1) is first started until a sufficient pressure is built up at the inlet (27) of each gear pump (21). Once this pressure is reached, each gear pump (21) is started again. In an underwater granulating system, the granulating blades (12) are rotationally driven last (FIG. 1).

Abstract: An apparatus for filling a screw (7) bearingly supported within a housing (6), in particular of an extruder, for processing of pre-comminuted synthetic plastics material, in particular PET, has a filling opening (5) for the screw housing (6). This filling opening (5) is in flow connection with the lower outflow opening (4) of an upright receptacle 81) for the material to be processed. Within the receptacle (1), tools (30, 31) circulate around a preferably vertical axis, and they act on the material positioned within the receptacle (1). This material is introduced into the evacuable receptacle (1) through a sluice (60). A quickly circulating tool (30) for creating a mixing cone (71) is disposed between an upper interior portion (68) and a lower interior portion (69) of the receptacle (1).

Abstract: The invention relates to a device for granulation of an ejected material form at least one nozzle (7), in particular a thermoplastic plastic, with a perforated plate (2) comprising the nozzles (7). A blade head (10), supporting several blades (11) lies opposite the same, fixed to a shaft (9) which is rotatably driven by a motor (13). The motor (13) is suspended such as to be displaced relative to the housing (1) by means of a suspension (15), however the above is suspended in such a manner that displacement is only possible in the direction of the axis (8) of the shaft (9) and not in a radial direction. Said suspension (15) comprises at least one membrane (14) which suspends the motor (13) on the granulator housing (1). The motor (13) can be adjusted relative to the perforated plate (2) by means of an adjuster device (27), such that the desired pressure of the blade on the perforated plate (2) is maintained. The excised granulate particles are drawn out of the housing (1) by means of coolant.