The invention relates to various aspects in the production and further processing of plastic sheet material, in particular a spun-bonded non-woven fabric, a melt-blown non-woven fabric, a composite non-woven fabric, a blown film, a flat film, a plastic board or a plastic panel. A core aspect in the value chain of sheet material is a method and device for providing, retrieving and using a data element for exchanging in an over-lapping step-wise manner, a plurality of different data elements for producing the end product within the value chain of the sheet material. Within the value chain, it is possible to optimize the method using said data, to improve the construction of the used machines and systems and to improve the system technology as well as method technology for producing the sheet material.

A self-cleaning dosing apparatus includes a material hopper for containing pellets of material, a feed screw, a first material outlet through which pellets of material fall by gravity onto a first end of the feed screw for the feeding of pellets to a process machine. A second material outlet is located beneath the first end of the feed screw, with a slide gate blocking the second material outlet. A pneumatic piston is provided for pulling the slide gate to unblock the second material outlet, and a Venturi pump is located under the second material outlet for pulling pellets through the second material outlet when the slide gate is opened.

The invention relates to a method for producing a plastic film from a total amount of raw materials using a film extrusion machine. According to the invention, the method comprises the following steps: detecting film parameters relating to desired properties of the plastic film, detecting raw material parameters relating to properties of the raw materials, grouping the raw material parameter into at least two raw material parameter groups, forming correlations between raw material parameter groups, forming correlations between film parameters and the raw material parameter groups based on a film production model, detecting a selection of at least one raw material from at least one raw material parameter group, calculating at least one production parameter of the film extrusion machine based on the film production model.

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.

A method for producing reels of plastic film by cast extrusion process is described. The steps include causing the film to flow from an extrusion head slit, adjusting its thickness, drawing the exiting film with an internally cooled roll, winding the film downstream of the roll to form reels of film, measuring the thickness of the film and adjusting the thickness of the film based on the thickness measurements provided by the thickness measuring device. The method further includes measuring a reference quantity of the film reels produced, comparing the reference quantity measured value with a design value of the reference quantity corresponding to the design value of the thickness of the film and if the measured value is different from the design value of the reference quantity, acting on adjustment means and/or on the thickness measuring device to obtain a desired film thickness.

A connecting tube assembly (128) for an extruder (110) is proposed. The connecting tube assembly (128) comprises a connecting tube (130), wherein the connecting tube (130) is configured for connecting to a dosing conveyor device (118) and a side feed (126) of the extruder (110), wherein the connecting tube (130) defines a longitudinal axis (132), and a drive device (142), wherein the drive device (142) is configured for rotating the connecting tube (130) about the longitudinal axis (132). Furthermore, an extruder (110) is proposed.

A film blowing machine for producing a film web from a recycled material having a.-an extruder for melting and homogenizing the recycled material into a melt, b. an annular die for extruding a film tube, c. a guide for a melt flow between the extruder and the annular die via an annular die melt pump, for conveying the melt to the annular die, d. a tube-forming zone for longitudinal and transverse drawing of the film tube, e. a cooling means for the film tube moving in the machine direction, f. a flattening unit on the other side of the tube-forming zone for flattening the film tube into a double layer film web, g. a pair of draw-off rollers on the other side of the cooling means for drawing off the film tube, and h. the extruder is designed as a twin-screw extruder.

It is provided an extrusion device for a plastic profile, in particular a hollow chamber profile, with an extruder, an extrusion nozzle arranged at the exit of the extruder for forming the plastic profile the plastic profile subsequently being guided through a calibration device, a downstream removal device for the plastic profile, a cutting device for cutting off parts of the extruded plastic profile and a weighing device for measuring the profile weight. A profile monitoring device is provided for detecting at least one profile parameter of the plastic profile in the extrusion direction after it has emerged from the extrusion nozzle and/or a process monitoring device is provided for detecting at least one process parameter in and/or before of the extruder, the extrusion nozzle, the calibration device, the removal device and/or the cutting device.

It is provided an extrusion device for a plastic profile, in particular a hollow chamber profile, with an extruder, an extrusion nozzle arranged at the exit of the extruder for forming the plastic profile the plastic profile subsequently being guided through a calibration device, a downstream removal device for the plastic profile, a cutting device for cutting off parts of the extruded plastic profile and a weighing device for measuring the profile weight. A profile monitoring device is provided for detecting at least one profile parameter of the plastic profile in the extrusion direction after it has emerged from the extrusion nozzle and/or a process monitoring device is provided for detecting at least one process parameter in and/or before of the extruder, the extrusion nozzle, the calibration device, the removal device and/or the cutting device.

A simulated cold extrudate profile, which defines a profile of an extrudate in a cooled state, by a cold profile modeling unit, the determination of a deviation of the cold extrudate profile from a specified extrudate profile by means of a comparison unit and an optimization, based on the deviation, of the process parameters by means of a parameter determining unit, in such a way that a deviation of a cold extrudate profile that is produced from the extrudate profile that is specified becomes small.