Abstract: The present invention relates to a method for changing material in an extrusion device comprising at least two supply devices for supplying feedstock for an extruder, comprising the following steps: identifying a change request for changing the material in the extrusion device, preparing the supply devices for changing the material, separating at least two supply devices from the feed of feedstock to the extruder, discharging feedstock from the separated supply devices, filling subsequent material into the empty supply devices.

Abstract: An extrusion device that produces plastic film includes at least two feed units that feed feedstock for an extruder, wherein, in each feed unit an automatic cleaning device is arranged for a removal of feedstock from the feed unit when changing material in the extrusion device.

Abstract: The above object is solved by means of a method comprising the features as described herein as well as an extrusion device comprising the features as described herein. Further features and details of the invention follow from the depending claims, the description and the drawings. It goes without saying that features and details, which are described in connection with the method according to the invention, shall thereby also apply in connection with the extrusion device according to the invention and in each case vice versa, so that, with regard to the disclosure, reference is or can always be mutually made, respectively, to the individual invention aspects.

Abstract: An extrusion device that produces plastic film includes at least two feed units that feed feedstock to an extruder, wherein each feed unit has at least one discharge opening including a discharge closure to open and close the discharge opening, and a container interface that reversibly fastens a discharge container that accommodates feedstock discharged from the respective feed unit.

Abstract: The invention relates to a method for the changing of material from a starting material to a subsequent material with an extrusion device (10) for the production of extrusion products (100) comprising the following steps: recognition of a change of material requirement, performance of at least one preparation step for the change of material, performance of the change of material after termination of at least one of the preparation steps.

Abstract: An extrusion device that produces plastic film includes at least two feed units that feed feedstock to an extruder, wherein each feed unit has at least one discharge opening including a discharge closure to open and close the discharge opening, and a container interface that reversibly fastens a discharge container that accommodates feedstock discharged from the respective feed unit.

Abstract: An extrusion device that produces plastic film includes at least two feed units that feed feedstock for an extruder, wherein, in each feed unit an automatic cleaning device is arranged for a removal of feedstock from the feed unit when changing material in the extrusion device.

Abstract: The present invention relates to a method for preparing for a change of material in an extrusion device for a film machine comprising at least one feed unit for feeding feedstock to an extruder, comprising the following steps: predetermining an end of a production order of an extrusion device, specifying a reduced changing filling level for the at least one feed unit, and maintaining the filling level of the at least one feed unit at the reduced changing filling level for the further production with the extrusion device.

Abstract: A blow head for production of a multilayer blown film with at least two plastic layers has melt guide areas, which are traversed in succession in the direction of flow (z) of the melt, including feed lines to at least two individual gaps for guiding an individual stream, and an annular gap for combining of the film composite. At least one thermocouple is arranged on at least one flow path of at least one individual stream before the stream reaches the annular gap.

Abstract: The invention describes a blow head (1, 21, 208) for production of a multilayer blown film (18) with at least two plastic layers, which (1, 21, 208) has at least the following melt guiding areas (16, 17, 25, 205), which are traversed in succession in the direction of flow (z) of the melt: feed lines (25, 205) to the at least two individual gaps for guiding an individual stream at least two individual gaps (16) for guiding of an individual stream an annular gap (17) for combining of the film composite (18). At least one thermocouple (85, 142) is arranged on at least one flow path of at least one individual stream before it reaches the annular gap (17).

Abstract: To control the film thickness in a blown film extrusion line with reversing or rotating takeoff of the film bubble, the thickness profile of the blown film bubble is measured over its circumference. Different temperatures can be applied to sections of the film bubble by a die ring divided into heating sections provided with control elements or by heating elements, forming a ring around the extruded film bubble and provided with control elements. In order to correctly assign the position of the measured thickness profile to the heating sections of the die ring or the heating elements, the extruded film bubble is provided with a mark in the region of the die ring or the heating elements and the rotation of this mark is measured by a measuring device at specified intervals from the die ring or the heating elements.