Melt conductor (1), in particular melt distributor or melt mixer, for an extruding die (2) of an extrusion facility (3), having a melt conductor block (4) with a multi-channel system (5), the multi-channel system (5) being arranged so as to extend three-dimensionally inside the melt conductor block (4) and having at least one input (6) and at least one output (7) for polymer melt, between one input (6) and one output (7) fluidically connected to the input (6) several branchings (8) arranged in series and several levels (9a, 9b, 9c) of sub-branches (10) being formed over several levels (12a, 12b) of divided melt channels (11a, 11b), m melt channels (11a) of the a.sup.th level (12a) with x.sup.th local cross-sections and n melt channels (11b) of the b.sup.th level (12b) with y.sup.th local cross-sections being present, wherein n>m if b>a, the y.sup.th local cross-sections of the melt channels (11b) of the b.sup.th level (12b) being smaller than the x.sup.th local cross-sections of the melt channels (11a) of the a.sup.th level (12a),

and wherein in the area of the multi-channel system (5), means for at least indirectly influencing polymer melt are arranged.

The invention relates to a melt conductor (1), in particular a melt distributor or melt mixer, for an extruding die (2) of an extrusion facility (3), comprising two or more melt conductor blocks (4a, 4b) and a multi-channel system (5), the multi-channel system (5) being arranged inside at least one of the melt conductor blocks (4a, 4b) with three-dimensional extension and having at least one input (6) and at least one output (7) for polymer melt, between one input (6) and one output (7) fluidically connected to the input (6) several branchings (8) arranged in series and several levels (9a) of sub-branches (10) being formed over several levels (12a, 12b) of divided melt channels (11a, 11b); with m melt channels (11a) of the a.sup.th level (12a) with x.sup.th local cross-sections and n melt channels (11b) of the b.sup.th level (12b) with y.sup.th local cross-sections being present, wherein n>m if b>a, the y.sup.th local cross-sections of the melt channels (11b) of the b.sup.th level (12b) being smaller than the x.sup.th local cross-sections of the melt channels (11a) of the a.sup.th level (12a). The invention further relates to an extruding die, an extrusion facility and to a method of operating the extrusion facility.

A calibration device for a calibration, in particular wet calibration of an extrusion device is provided. The calibration device comprises a calibrating element which includes an opening for guiding through a profile produced by means of an extrusion die of the extrusion device and at least one rotatable guide roller which is in contact with the profile when the profile is guided through the opening. The calibration device further comprises at least one separate bearing element insertable into a cutout of the calibrating element, via which the guide roller can rotatably be mounted on the calibrating element.

A system for optimizing the multi-extruder deposition process in a 3D printer including multiple extruders requires each extruder to have a body including an outer thermal insulation shell; the shell allowing the inlet/outlet of a fluid for the active and controlled refrigeration of the extruder. A method for optimizing the multi-extruder deposition process in a 3D printer with multiple extruders involves managing the temperature of each extruder using active refrigeration sized so as to have a sudden control of the cooling ramp and to manage the viscosity of the material in the event of extruder change. For the entire duration of the printing with another extruder, the unused extruder nozzle remains in a limited range around the extrusion temperature, thus eliminating downtime, while the solidified filament from the sudden forced cooling is pulled back into a low temperature nozzle area where it does not degrade during non-use.

The invention relates to a method for producing plastic profiles, according to which a starting material is plasticated and formed in an extruder, then is cooled and calibrated in at least one dry calibration unit and at least one calibration tank and is subsequently subdivided into individual profile sections. To achieve optimal control of the extrusion line, measurements relating to the geometry and/or the weight of the plastic profile are continuously carried out downstream of the calibration tank and correction values, which are used to change settings in the extruder, the dry calibration unit and/or the calibration tank, are calculated directly from these measured values.

The present invention relates to a connection adapter for connecting two melt-guiding components having two adapter halves having connection means for connection to a respective one of the components and having connection means for connecting the two adapter halves to one another and having a melt-guiding piece that is adapted to a first of the melt-guiding components by a first opening cross-section and to the second of the melt-guiding components by a second opening cross-section. The invention furthermore relates to a melt processing plant having two melt-guiding components such as an extruder and a pelletizer that are connected to one another by such a connection adapter. In accordance with the invention, the melt-guiding piece is formed separately from the adapter halves and is tensionable against the melt-guiding components by the mutually connected adapter halves.

A filtering device for highly viscous media, in which filtering device a rotatably mounted screening wheel which has a plurality of screening cavities is arranged between a front housing element and a rear housing element. According to the invention, a plurality of screening cavities lying beside one another, through which flow can pass jointly, are combined into at least one filter group. To this end, on both sides beside the filter group, a closed blocking segment is provided on the screening wheel which segment, when positioned in associated blocking regions of the housing, is sealed off with respect to the housing elements on both sides of the screening wheel. The blocking regions in the housing are in each case larger than or as large as a screening cavity together with a sealing web surrounding the same.

A method for replacing one or more components of a lip adjustment assembly mounted to a die body of an extrusion die is disclosed. Initially, a translating unit of the lip adjustment assembly is accessed through an exposed end of the lip adjustment assembly. Then, an adjustment actuator is removed from a translator of the translating unit. The translator is decoupled from a rod of the translating unit so that the translator is removable from the lip adjustment assembly and with respect to the rod. Next, the translator is removed from the lip adjustment assembly and a first component of the translating unit is replaced with a second component of the translating unit.

An extrusion die includes a first die body having a first lip, and a second die body having a second lip. A lip adjustment assembly is mounted to the first die body and configured to adjust the position of the first lip relative to the second lip to thereby adjust a thickness of the extrudate that exits the gap. The lip adjustment has translating unit that includes translator, a mounting member coupled to the translator, and a rod coupled to the mounting member so that the translator is fixed with respect to the rod. The mounting member is configured to be accessible from the exposed end to decouple the translator from the rod so as to remove the translator from the lip adjustment assembly.

A gearbox assembly for a twin-screw extruder comprises a speed change gearbox for adjusting a screw shaft speed of two screw shafts of the twin-screw extruder, a distribution gearbox allowing the screw shafts to be coupled thereto, and a speed reduction gearbox. The speed change gearbox and the speed reduction gearbox are configured such as to be separable from each other, wherein the speed change gearbox is arranged at a driving end while the speed reduction gearbox couples the speed change gearbox to the distribution gearbox. Due to the fact that the speed change gearbox is configured as an individual gearbox unit arranged at the driving end, an adjustment of the screw shaft speed is easily possible by replacing the speed change gearbox. As a result, a high flexibility and productivity are obtained in the operation of the twin-screw extruder.