The invention relates to a method for calibrating adjusting means (120) for adjusting a nozzle slot (112) of a discharge nozzle (110) for a film track (FB) on a flat film machine (100), comprising the following steps: specifying a calibration position (KP) for the adjusting means (120), performing a controlling intervention to change the adjusting position (SP) of the adjusting means (120), acquiring the reaching of the calibration position (KP) of the adjusting means (120).

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.

The invention relates to a method for switching the production of a flat film machine (100) from a feed product (EP) to a follow-on product (FP), comprising the following steps: recognizing a switching request for a switch from the feed product (EP) to the follow-on product (FP), determining a current feed control value (ES) of at least one control variable (SG) of the flat film machine (100) for the feed product (EP), determining a follow-on control value (FS) of the same at least one control variable (SG) for the follow-on product (FP), generating a control signal (SS) for a defined variation of the at least one control variable (SG) of the flat film machine (100) from the feed control value (ES) to the follow-on control value (FS).

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 material in an extrusion device, predetermining a production stability for a time after the material of at least one supply device has been changed, comparing the predetermined production stability to a threshold value of stability, changing the material in at least one supply device depending on the result of comparison.

The invention relates to a method for automatically regulating the size of a nozzle discharge slot of a nozzle assembly, wherein the nozzle assembly comprises a first and a second nozzle lip and a nozzle discharge slot arranged between the nozzle lips for setting in a controlled manner a thickness profile of a conveyable melt. A plurality of adjusting elements, in particular a plurality of adjusting pins, coupled to a respective thermoelement, is arranged on the first nozzle lip, the thermoelements being controllable by the regulation in such a way that the slot can be adjusted by the action of a mechanical force from the respective adjusting element on the first nozzle lip, as a result of the expansion or contraction of the thermoelements. At an initial operation of the nozzle assembly for conveying the melt, the adjusting elements for subsequent regulation of the slot size are set uniquely free from play as the initial setting. The invention further relates to a control and/or regulation system.

A method for producing a flexible pipe for offshore transport of fluids such as oil and gas, the method includes: extruding the internal pressure sheath of polymer material; winding one or more armor layers around the extruded internal pressure sheath; extruding the outer sheath of polymer material; at least one of the extruded sheaths of polymer material is extruded continuously along the length of the pipe wherein at least one zone A and at least one zone B are extruded along the length of the pipe and zone A is extruded from a polymer including polypropylene, and the extruded sheath in zone A has an Youngs-modulus E.sub.A zone B is extruded from a thermoplastic vulcanizate polymer, and the extruded sheath in zone B has an Youngs-modulus E.sub.B, where E.sub.B<0.9×E.sub.A and the polymers forming zone A and B are switched during extrusion to provide a continuous sheath.

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.

An interchangeable unit adapted to couple to a computer numerical control (CNC) machine is disclosed comprising a holder that couples to a spindle of the CNC machine, a controller, wherein said controller is configured to receive the rotational speed of the spindle as an input, and a material processing unit, wherein said material processing unit executes a first function in response to a first rotational speed range of the spindle and executes a second function in response to a second rotational speed range of the spindle.

A method for operating an extruder that has a screw, including the steps: (a) detection of a formulation identifier which is associated with material to be extruded and which encodes at least one operating variable, from which an ideal screw rotational frequency of the screw, which is to be set for the extrusion process, can be determined, (b) time-dependent detection of a throughput parameter, from which a throughput of the extruder can be deduced, (c) detection of a non-conformance point in time, at which the material can no longer be produced with a predefined quality, owing to excessive wear of the extruder, and (d) calculation of a limit throughput parameter from the throughput parameter, linking of the limit throughput parameter to the formulation identifier, and storing of the limit throughput parameter.

The present invention relates to an overturning device (10) for overturning a molten material (200) in a melt channel (110) comprising a melt inlet (20) and a melt outlet (30), wherein between the melt inlet (20) and the melt outlet (30) at least a melt guidance means (40) is assembled for a rearrangement of molten material (200) from the centre (22) of the melt inlet (20) at the edge (34) of the melt outlet (30) and for a rearrangement of molten material (200) from the edge (24) of the melt inlet (20) in the centre (32) of the melt outlet (30).