Abstract: The invention relates to a method for producing a tread (20), comprising the steps: extruding the tread (20), which has an outer side (22) and an inner side (24), opposite the outer side (22), and a carrying region (26) made of a carrying region rubber material and a guide strip (28) made of a guide strip rubber material, wherein the guide strip (28) extends from the outside (22) to the inside (24) and a specific electrical guide strip resistance (W28) of the guide strip rubber material is smaller than a specific electrical carrying region resistance of the carrying region rubber material. The steps according to the invention are: determining an electrical guide strip resistance (W28) of the guide strip (28) between the outer side (22) and the inner side (24) and outputting a warning signal when the electrical resistance (W) exceeds a specified maximum resistance (W28,max).

Abstract: A tyre strip extrusion apparatus includes extruders and an extrusion head which includes a head housing having feed openings respectively connected to the extruders for feed of extrusion material. An injection moulding tool is connected to the head housing and includes a profile plate formed with an outlet opening which communicates with the feed openings for extrusion material to flow from the feed openings to the outlet opening for extruding a web from the extrusion material. Bearing against the head housing along a first parting surface is a first distributor plate. A second distributor plate is arranged upstream of the profile plate in flow direction of the extrusion material. The first distributor plate bears along a second parting surface against the second distributor plate. The first and second distributor plates are configured such that at least a majority of the material paths runs through the first and second parting surfaces.

Abstract: The invention relates to a hose extrusion head for producing a hose (50), said head comprising a head housing, a duct (14) formed in the head housing (12) for supplying a hose material (22), a pin (16) which is arranged in the duct (14), a die (18) and at least one securing element (20). According to the invention, the securing element (20) is attached by one end (39) to the die (18) such that said end (39) follows the movement of the die (18).

Abstract: The invention relates to a multiple extrusion press head for producing tread profiles of tyres, comprising: a base body (12) having a first supply opening (22) for connecting a first extruder, a second supply opening (24) for connecting a second extruder, a third supply opening (26) for connecting a third extruder, and a fourth supply opening for connecting a fourth extruder; a first head part (14) which is mounted such that it can swivel in relation to the base body, and which has a receiving means (32) that is open in the direction of the base body (12); a second head part that is mounted such that it can swivel in relation to the base body (12); at least one flow channel insert (18, 20) that is mounted such that it can swivel in relation to the base body (12), wherein the first head part (14) and the second head part (16) can be brought into a closed state, in which the head parts (14, 16) are connected to one another in a pressure-tight manner, and a first flow channel (34), a second flow channel (36), a

Abstract: The invention relates to a calender stack for an extruded material web (51) made from thermoplastic, in particular a film web, having (a) a stand (1) which has (i) a first guide rail set (2) which comprises two arcuate first guide rails (2?, 2?) and (ii) a second guide rail set (3) which comprises two arcuate second guide rails (3?, 3?), (b) a first calender roll (8) which can be rotated about a first calender roll rotational axis D8) and is mounted on the stand (1), (c) a second calender roll (9) which forms a calender with the first calender roll (8) and is fastened to the stand (1), (d) an adjusting roll (14) which can be rotated about an adjusting roll rotational axis (D14) and is mounted on the stand (1), and (e) a supporting device (34), on which the stand (1) is mounted rotatably in such a way that the first calender roll rotational axis (D8) remains stationary during a rotation of the stand (1).

Abstract: A tyre strip extrusion apparatus includes extruders and an extrusion head which includes a head housing having feed openings respectively connected to the extruders for feed of extrusion material. An injection moulding tool is connected to the head housing and includes a profile plate formed with an outlet opening which communicates with the feed openings for extrusion material to flow from the feed openings to the outlet opening for extruding a web from the extrusion material. Bearing against the head housing along a first parting surface is a first distributor plate. A second distributor plate is arranged upstream of the profile plate in flow direction of the extrusion material. The first distributor plate bears along a second parting surface against the second distributor plate. The first and second distributor plates are configured such that at least a majority of the material paths runs through the first and second parting surfaces.

Abstract: A wearing body or bushing having an axial twin borehole for receiving a twin screw for extruding meltable material, in particular plastic. In order to avoid cracking and to save material, the wearing body has a radial cross section with an outer contour, which is convexly curved over the entire circumference and is in the form of an oval, and with first and second axes of symmetry, which run perpendicularly to one another and define a point of intersection which lies on the extrusion axis. The width of the oval on the first axis of symmetry is greater than the height of the oval on the second axis of symmetry.

Abstract: An extruder screw includes an extruder shaft and at least one extruder segment. The extruder shaft has a prismatic mandrel having external teeth and a longitudinal mandrel axis. The extruder segment has internal teeth and a longitudinal internal-teeth axis and can be slid onto the mandrel, such that the extruder segment can be connected to the mandrel for rotation therewith. The internal teeth have a profile having a meshing profile and, in an inner area between the first and second end faces of the extruder segment, include a prismatic main profile that has a main cross-section. Furthermore, the internal teeth of the extruder segment have an edge profile adjacent to at least one end face of the extruder segment, which edge profile has a smaller edge cross-section than the main profile at least in the area of the meshing profile.

Abstract: The invention relates to a multiple extrusion press head for producing tread profiles of tyres, comprising: a base body (12) having a first supply opening (22) for connecting a first extruder, a second supply opening (24) for connecting a second extruder, a third supply opening (26) for connecting a third extruder, and a fourth supply opening for connecting a fourth extruder; a first head part (14) which is mounted such that it can swivel in relation to the base body, and which has a receiving means (32) that is open in the direction of the base body (12); a second head part that is mounted such that it can swivel in relation to the base body (12); at least one flow channel insert (18, 20) that is mounted such that it can swivel in relation to the base body (12), wherein the first head part (14) and the second head part (16) can be brought into a closed state, in which the head parts (14, 16) are connected to one another in a pressure-tight manner, and a first flow channel (34), a second flow channel (36), a

Abstract: The invention relates to a hose extrusion head for producing a hose (50), said head comprising a head housing, a duct (14) formed in the head housing (12) for supplying a hose material (22), a pin (16) which is arranged in the duct (14), a die (18) and at least one securing element (20). According to the invention, the securing element (20) is attached by one end (39) to the die (18) such that said end (39) follows the movement of the die (18).

Abstract: A wearing body or bushing having an axial twin borehole for receiving a twin screw for extruding meltable material, in particular plastic. In order to avoid cracking and to save material, the wearing body has a radial cross section with an outer contour, which is convexly curved over the entire circumference and is in the form of an oval, and with first and second axes of symmetry, which run perpendicularly to one another and define a point of intersection which lies on the extrusion axis. The width of the oval on the first axis of symmetry is greater than the height of the oval on the second axis of symmetry.

Abstract: An extruding device includes an extruder cylinder, a screw, and a rotary drive for the screw. To facilitate installation and removal of the assemblies of the extruding device, the screw end facing the rotary drive does not protrude during operation into bearings provided between the extruder cylinder and rotary drive, particularly not into a thrust bearing.

Abstract: A method for aligning a cutter spindle of a granulator, particularly an underwater granulator, relative to a cutting plate includes rotationally driving the cutter spindle with a drive motor, measuring a force acting on the cutter spindle, generating a corresponding signal, and adjusting especially the angular alignment of the cutter spindle relative to the cutting plate as a function of the signal by pivoting the cutter spindle about at least two pivot axes which enclose an angle with each other A granulator, particularly an underwater granulator, for producing plastic granulate, has a cutting box and a cutter spindle, a cutter holder rotatably received in the cutting box, and a drive motor connected to the cutter spindle, and is configured to perform the aforedescribed method.

Abstract: An extruding device includes an extruder cylinder, a screw, and a rotary drive for the screw. To facilitate installation and removal of the assemblies of the extruding device, the screw end facing the rotary drive does not protrude during operation into bearings provided between the extruder cylinder and rotary drive, particularly not into a thrust bearing.

Abstract: The present invention relates to a method for aligning a cutter spindle of a granulator, particularly an underwater granulator, relative to a cutting plate (4). As precise an alignment of the cutter spindle is of great significance here for continuous very high to optimal quality of the granulate. According to the invention, such can be achieved by the following steps. Rotationally driving the cutter spindle (14) by means of a drive motor, measuring a force acting on the cutter spindle (14), generating a corresponding signal, and adjusting the alignment and especially the angular alignment of the cutter spindle (14) relative to the cutting plate (4) as a function of the signal.

Abstract: In a method of producing an injection-molded part, a material is processed and/or plasticized by means of a multi-screw extruder having a plurality of processing zones. An additive having barrier characteristics is admixed by a feed unit in at least one of the processing zones. The material is processed and dried in the extruder, and can then be transferred to a transfer reservoir for further processing.

Abstract: In a method for producing injection-molded parts, PET material is processed and/or plasticized by means of a twin-screw extruder having a plurality of processing zones. At least two processing zones are implemented as degassing zones. The processed and/or plasticized material is transferred to a transfer reservoir and then further processed by a piston unit.

Abstract: In a method for producing injection-molded parts, PET material is processed and/or plasticized by means of a twin-screw extruder having a plurality of processing zones. At least two processing zones are implemented as degassing zones. The processed and/or plasticized material is transferred to a transfer reservoir and then further processed by a piston unit.

Abstract: A screw element for use as a kneading element in a plasticizing unit includes at least two kneading units which can be arranged on a common axis, for example a screw shaft. The kneading units have a geometry which is designed for attaining particularly good plasticization and reduced mechanical stress in such a way that the geometry of at least two successively arranged kneading units differs.

Abstract: The invention relates to a gear pump which is suitable for delivering highly viscous materials. The aim of the invention is to provide a gear pump having a low-wear and low-maintenance bearing system, high output and good self-cleaning properties. For this purpose, the gear pump according to the invention comprises a housing, a gear section comprising a sun wheel and a plurality of stationarily mounted planet wheels, an input screw section comprising an input screw shaft linked with the sun wheel in a rotationally fixed manner and an input transfermix area, and an output screw section comprising an output screw shaft linked with the sun wheel in a rotationally fixed manner and an output transfermix area. The screw shafts, in the transfermix areas, have flight depths that decrease toward the gear section.