Method for indirectly deriving a systematic dependency between a setting parameter and an optical property of a film web, method for adapting the quality of a film web

Method according to claim 1, characterized in that the specific dependence of the parameters is determined in form of a coefficient of determination comprising curve.

Method according to claim 1, characterized in that the specific dependency of the parameters is determined by a setting range, which is depended on a given threshold value for the optical property of the film web.

Method according to claim 1, characterized in that the specific dependence is determined in the form of an envelope curve, which is depending on a given threshold value for the optical property of the film web.

Method according to claim 1, characterized in that a measured variable, which describes a geometric or functional property of film web and is dependant on an optical property, is determined by means of an optical sensor as a third parameter of the method, wherein the determined parameter is stored in a data base in ordered manner with reference to the detected parameters according to claim 1, and whereby from the—in the data base stored—data systematically a specific dependency between the parameters is derived.

Method according to claim 1, characterized in that a measured variable is determined by means of a sensor as a further parameter of the method, in particular a process variable from the spatial environment of the manufacturing process or the production process of the film web, in particular none setting variable, wherein the specific parameter is stored in a data base in ordered manner referring to the parameters detected according to one of the preceding claims, and a specific dependence between the parameters is derived from the data stored in the data base systematically.

Method according to claim 1, characterized in that the specific dependency between the parameters is systematically derived and therefore data from an existing database are used.

Method according to claim 1, characterized in that the specific dependency between the parameters is systematically derived and for that an already existing database is continuously extended.

Method according to claim 1, characterized in that the specific dependence between the parameters is derived systematically and for that only data of a specific manufacturing device are used.

Method according to claim 1, characterized in that the specific dependence between the parameters is systematically derived, and for that data from a plurality of manufacturing devices are used for the production of film webs.

Method according to claim 1, characterized in that the specific dependence between the parameters is derived systematically, and for that data from a variety of manufacturing devices of different art are used for the production of film webs.

Method according to claim 1, characterized in that the specific dependence between the parameters is derived systematically, and for that data from a variety of manufacturing devices are used for the production of film webs of a producer and/or many producers.

Method according to claim 1, characterized in that the specific dependence between the parameters is systematically derived, and for that data from a plurality of manufacturing devices for producing film webs are synchronized with a data cloud.

Method according to claim 1, characterized in that the specific dependence between the parameters is determined heuristically.

Method according to claim 1, characterized in that the specific dependence between the parameters is determined mathematically.

Method according to claim 1, characterized in that the specific dependence between the parameters is determined by an optimization method.

Method according to claim 1, characterized in that the specific dependence between the parameters is determined by a self-learning optimization method.

Method according to claim 1, characterized in that a measured variable determines the optical properties of the film web, in particular the degree of gloss of the film and/or the haze of the film and/or the transparency of the film and/or the optical density of the film and/or the reflection grad of the film and/or the transmittance of the film and/or the printed image the film and/or the wrinkle image of the film and/or any scratches on the film and/or the surface topography of the film and/or the layer thicknesses of the film and/or the single layer thicknesses of the film and/or the tension within the film.

Method according to claim 1, characterized in that a measured variable determines functional properties of the film web in dependence of the optical properties, in particular the raw materials used and/or the proportions of the individual raw materials and/or the proportion of recycled material and/or the water vapour permeability of the film and/or the breathability of the film and/or the barrier properties of the film and/or the stretch rate of the film and/or the flatness position of the film and/or the thickness of the film and/or the profile of the film and/or the tackiness of the film and/or the uniformity of the result of stretching and/or the molecular orientation of the film.

Method for producing a film web, wherein a blown film or cast film plant is operated during the manufacturing process, wherein during the manufacturing process, a method is carried out according to claim 1.

Device for producing a film web, wherein the device comprises an extruder for plasticizing a thermoplastic, a nozzle for the escape of the plastic, a deflection part and a winder,

• characterized in that
• the device comprises an actuator for inline affecting the quality of the film and a data processing and evaluation unit, wherein the data processing and evaluation unit has a programming, wherein the programming is performed for carrying out a method according to claim 1.