Abstract: A device produces plastic pipes by extrusion, involving an extruder, a pipe head connecting to the extruder in production direction, having a base material, mandrel, and sheath. A melt channel, formed between the mandrel and sheath in production direction, promotes flow at least at the mandrel and sheath end, the mandrel and sheath being adjustable forwards and backwards relative to one another, and the outer mandrel surface and/or the inner sheath surface at least partially having a material with greater sliding capacity than the base material. Mandrel diameter at the end conically widens or narrows, and/or the mandrel end is curved so the diameter widens, narrows, or remains constant, and the inner sheath diameter at the end conically widens, narrows, or remains constant, and/or the sheath end is curved so the diameter widens or narrows, or two further surface sections, parallel and cylindrical, extend at the mandrel and sheath end.

Abstract: In an embodiment, the present invention provides a method for increasing the cooling performance of an extrusion line and for extruding a plastics profile, in particular a plastics tube, in an energy efficient manner, the method including the steps of: melting plastics material in an extruder; shaping a plastics strand and feeding the plastics strand to a die; shaping a plastics profile using the die; and calibrating and curing by cooling the profile in a cooling and/or calibration device, a gaseous medium being drawn through one or more cooling tanks in order to cool the outside of the profile. A temperature and a saturation of the gaseous medium is increased between an inlet region and an outlet region for the gaseous medium. A liquid medium is added between the inlet region and the outlet region using spray nozzles.

Abstract: An apparatus produces plastic tubes by extrusion with an extruder, a pipehead being attached to the extruder in production direction, having a base material with at least one mandrel and a sleeve, a melt channel between the mandrel and the sleeve, the melt channel shaped to aid flow in production direction at least at the mandrel's end and at the sleeve's end, the mandrel and sleeve being adjustable backwards and forward relatively to one another, the outer surface of the mandrel and/or the inner surface of the sleeve at least partially has a material that allows for a higher sliding quality than the base material. The outer and/or the inner surface (i) has a coating either unvaried, or whose sliding quality constantly improves, or whose sliding quality alternately improves and worsens, in the production direction, or (ii) is partially coated, or (iii) the mandrel and/or sleeve fronts are coated.

Abstract: An apparatus produces plastic tubes by extrusion with an extruder, a pipehead being attached to the extruder in production direction, having a base material with at least one mandrel and a sleeve, a melt channel between the mandrel and the sleeve, the melt channel shaped to aid flow in production direction at least at the mandrel's end and at the sleeve's end, the mandrel and sleeve being adjustable backwards and forward relatively to one another, the outer surface of the mandrel and/or the inner surface of the sleeve at least partially has a material that allows for a higher sliding quality than the base material. The outer and/or the inner surface (i) has a coating either unvaried, or whose sliding quality constantly improves, or whose sliding quality alternately improves and worsens, in the production direction, or (ii) is partially coated, or (iii) the mandrel and/or sleeve fronts are coated.

Abstract: A device produces plastic pipes by extrusion, involving an extruder, a pipe head connecting to the extruder in production direction, having a base material, mandrel, and sheath. A melt channel, formed between the mandrel and sheath in production direction, promotes flow at least at the mandrel and sheath end, the mandrel and sheath being adjustable forwards and backwards relative to one another, and the outer mandrel surface and/or the inner sheath surface at least partially having a material with greater sliding capacity than the base material. Mandrel diameter at the end conically widens or narrows, and/or the mandrel end is curved so the diameter widens, narrows, or remains constant, and the inner sheath diameter at the end conically widens, narrows, or remains constant, and/or the sheath end is curved so the diameter widens or narrows, or two further surface sections, parallel and cylindrical, extend at the mandrel and sheath end.

Abstract: A suction and irrigation device for medical use comprises a valve body with an irrigation passage and a suction passage. At least one irrigation pipe and at least one suction pipe are connectable to the irrigation passage and the suction passage by connections at a proximal side of the valve body. A suction/irrigation tube is connectable to the irrigation passage and the suction passage at a distal side of the valve body by at least one further connection. A valve assembly is provided within the valve body, which in a first position opens the suction passage and closes the irrigation passage and in a second position closes the suction passage and opens the irrigation passage. The device comprises at least one push element which interacts with at least one movable element of the valve assembly, whereas the movable element is movable by mechanical force acted upon the push element such, that the push element activates the valve assembly from one position to the other position.

Abstract: A calibration device for calibrating extruded continuous profiles, in particular tubes, includes a housing and a plurality of segment bodies which are received in the housing in a substantially in circular manner, with axially neighboring segment bodies partially overlapping in a circumferential direction. Each segment body is made from a single-piece workpiece and has a contoured inner surface, wherein the inner surfaces of the segment bodies jointly define a calibration opening for passage of a tube. An operating device retains the segment bodies in the housing and allow adjustment of each segment body in radial direction.

Abstract: A calibration device for calibrating extruded continuous profiles includes successively arranged segment rings comprised of individual segments whose internal surfaces jointly form a calibration opening. Successively axially arranged segments are assembled in the form of a segment block. The segments of each segment block are arranged on a support structure and the segment blocks are arranged, in an essentially circular form, in a housing such that the axially adjacent segments partially overlap. Each support structure is connected to a mounting and operating device by which the individual segment blocks are fixed to the housing. Adjustment of each segment block is carried out in axial direction. The mounting and operating device is divided into two parts, wherein a first part is connected to the support structure, and a second part is received in the housing, and the two parts are connected with one another in a separable manner.

Abstract: A calibration device for calibrating extruded continuous profiles, in particular tubes, includes a plurality of successively arranged segment rings comprised of individual segments whose internal surfaces jointly form a calibration opening. Successively axially arranged segments are assembled in the form of a segment block. The individual segments of each segment block are arranged on a support structure, and the segment blocks are arranged, in an essentially circular form, in a housing in such a way that the axially adjacent segments partially overlap each other at each position thereof in a circumferential direction. Each support structure is connected to at least one mounting and operating device. The individual segment blocks which are associated to the support structures thereof are fixed to the housing with the aid of the mounting and operating device, and the adjustment of each segment block is carried out in an axial direction.

Abstract: An adjustable sizing device for sizing extruded continuous profiles, in particular tubes, includes a plurality of segment bodies disposed about a circle and having a plurality of slats for defining with their radially inner ends a common sizing opening. The segment bodies are held and adjusted in radial direction by actuators to thereby allow change in dimension of the sizing opening, wherein each of the segment bodies is operatively connected to at least one of the actuators. The actuators are received and aligned in at least one mounting ring which has a number of radial bores spaced from one another in circumferential direction at a number corresponding to a number of segment bodies.

Abstract: A calibration device for calibrating extruded continuous profiles, in particular tubes, includes a housing and a plurality of segment bodies which are received in the housing in a substantially in circular manner, with axially neighboring segment bodies partially overlapping in a circumferential direction. Each segment body is made from a single-piece workpiece and has a contoured inner surface, wherein the inner surfaces of the segment bodies jointly define a calibration opening for passage of a tube. An operating device retains the segment bodies in the housing and allow adjustment of each segment body in radial direction.

Abstract: A caterpillar take-off device for hauling off extrusion products, in particular plastic tubes, includes at least two caterpillar tracks arranged symmetrically in relation to a length axis of the caterpillar take-off device, at least during take-off process by changing the distance from the caterpillar tracks to the length axis. In the event of a change in cross-section of the extrusion product, the change is measured and the distance of the caterpillar tracks from the length axis is automatically adjusted such that the symmetry axis of the extrusion product coincides with the longitudinal axis of the caterpillar take-off unit.

Abstract: In a method of cooling a sheet-shaped or web-shaped substrate, such as a plastic sheet or a plastic web, the substrate is moved along a cooling path, and heat radiating from the substrate is absorbed and/or reflected along at least one zone of the cooling path to provide a controlled cooling pattern, by using covering elements which are disposed above and/or below the substrate, whereby the zone can be adjusted by the arrangement and/or number of covering elements.