Abstract: The invention relates to a mixing device for a twin-screw extruder, in particular a twin-screw extruder rotating in the opposite direction, comprising a first screw and a second screw, for mixing a melt flow in a screw antechamber, wherein the first screw has an extension in the form of a mixing screw tip connected to the first screw in a fixed manner, and a first melt channel, into which the first screw feeds, is arranged in a flow-connected manner via an elongated slot with a second melt channel, into which the second screw feeds.

Abstract: Aspects of the present disclosure are directed to an extrusion die for producing a plastic profile. In some embodiments, the extrusion die includes a first die plate having a flow channel for the plastic profile to be produced, at least one recess configured and arranged for accommodating exchangeable air nozzle inserts, and a connection on the outside of the first die plate. The exchangeable air nozzle inserts have an air channel with at least one air outlet nozzle. The extrusion die further including at least one air supply bore that leads from the connection on the outside of the first die plate into each of the at least one recess.

Abstract: The invention relates to a mixing device for a twin-screw extruder, in particular a twin-screw extruder rotating in the opposite direction, comprising a first screw and a second screw, for mixing a melt flow in a screw antechamber, wherein the first screw has an extension in the form of a mixing screw tip connected to the first screw in a fixed manner, and a first melt channel, into which the first screw feeds, is arranged in a flow-connected manner via an elongated slot with a second melt channel, into which the second screw feeds.

Abstract: A device is suggested for calibrating an extruded plastic profile (1) having a shaping extrusion die (3) and having a framework (6) which is displaceable in the longitudinal direction of the plastic profile (1) in relation to the extrusion die (3), which has a cooling tank (5) and, between the cooling tank (5) and the extrusion die (3), a dry calibration apparatus (4) which is replaceably attached to a carrier (12) and is connectable on one hand to supply lines for a coolant liquid feed and removal and on the other hand to a partial vacuum. To obtain advantageous mounting conditions, it is suggested that the carrier (12), which is adjustable in relation to the cooling tank (5) in the longitudinal direction of the plastic profile (1), form a distributor, connected to the supply lines (16, 17), having line transitions (25) for the coolant liquid and the partial vacuum in the placement area of the dry calibration apparatus (4), which is provided with corresponding line transitions.

Abstract: A device is suggested for calibrating an extruded plastic profile (1) having a shaping extrusion die (3) and having a framework (6) which is displaceable in the longitudinal direction of the plastic profile (1) in relation to the extrusion die (3), which has a cooling tank (5) and, between the cooling tank (5) and the extrusion die (3), a dry calibration apparatus (4) which is replaceably attached to a carrier (12) and is connectable on one hand to supply lines for a coolant liquid feed and removal and on the other hand to a partial vacuum. To obtain advantageous mounting conditions, it is suggested that the carrier (12), which is adjustable in relation to the cooling tank (5) in the longitudinal direction of the plastic profile (1), form a distributor, connected to the supply lines (16, 17), having line transitions (25) for the coolant liquid and the partial vacuum in the placement area of the dry calibration apparatus (4), which is provided with corresponding line transitions.

Abstract: A device is described for calibrating an extruded plastic profile having a support stand (2), which is assembled from hollow profiles, for a cooling and calibration unit (1) and having supply lines, which are provided in the stand (2), for the cooling and calibration unit (1). In order to provide simple construction conditions, it is suggested that at least individual hollow profiles (6, 7) of the stand (2) be implemented as supply lines having connections (9, 18) for the cooling and calibration unit.

Abstract: An apparatus for calibrating an extruded plastic profile forming at least one longitudinal groove (5), comprises a calibrating body (1) receiving the profile (2). Body (2) comprises a form nose (6) with a cooling channel (9) engaging in the longitudinal groove (5) and extending in the direction of passage of the profile, and coolant bores (13, 14, 26) extending transversally to the form nose (6) and crossing its cooling channel (9).

Abstract: An apparatus is described for calibrating an extruded plastic profile forming at least one longitudinal groove (5), comprising a calibrating body (1) receiving the profile strand (2) emerging from a shaping extrusion die for profiles, the body comprising a form nose (6) with a cooling channel (9) engaging in the longitudinal groove (5) of the profile strand (2) and extending in the direction of passage of the profile strand, and coolant bores (13, 14, 26) extending transversally to the form nose (6) and crossing its cooling channel (9).

Abstract: An apparatus is shown for severing profile pieces of an extruded profile strand (1) moved in its longitudinal extension, comprising a carriage (3) which is movable along the profile strand (1) and comprises a severing device with a saw blade (7) and at least two clamping jaws (5, 6) for holding in a non-displaceable manner the carriage (3) on the profile strand (1), and comprising a control device (13) connected with the clamping jaws (5, 6) and the severing device, which control device triggers the clamping jaws (5, 6) and the severing device depending on a predetermined length of the profile piece. In order to provide advantageous constructional conditions it is proposed that the severing device is associated with a knife (8) which can be moved transversally to the longitudinal extension of the profile strand (1), and that the control device (13) comprises a selector circuit (16) for optionally severing a profile piece with the saw blade (7) or the knife (8).