Abstract: The method for setting an operating point of a film stretching system comprises the method steps: acquiring an input, wherein the input contains: a) a target value for the first production variable; or b) a target value for the second production variable; or c) a target value for the third production variable; specifying: a) a setting value for the second production variable and the third production variable in order to achieve the target value for the first production variable; or b) a setting value for the first production variable and the third production variable in order to achieve the target value for the second production variable); or c) a setting value for the first production variable and the second production variable in order to achieve the target value for the third production variable; controlling the motor arrangement and the extruder arrangement by the control device in such a way that the operating point consisting of the target value and two setting values is reached.

Abstract: An improved control apparatus for producing plastic films and an associated improved method are distinguished, inter alia, by the following features: —the control apparatus has two stages or at least two stages, —the control apparatus comprises, for this purpose, a sensor module and/or a sensor model and a process module and/or a process model, —the machine-dependent sensor module and/or sensor model and the production-dependent process module and/or process model are linked or can be linked to one another via production variables, —adjustable machine variables are connected or linked to plant production variables via the sensor module and/or the sensor model.

Abstract: The method for setting an operating point of a film stretching system comprises the method steps: acquiring an input, wherein the input contains: a) a target value for the first production variable; or b) a target value for the second production variable; or c) a target value for the third production variable; specifying: a) a setting value for the second production variable and the third production variable in order to achieve the target value for the first production variable; or b) a setting value for the first production variable and the third production variable in order to achieve the target value for the second production variable); or c) a setting value for the first production variable and the second production variable in order to achieve the target value for the third production variable; controlling the motor arrangement and the extruder arrangement by the control device in such a way that the operating point consisting of the target value and two setting values is reached.

Abstract: An improved control apparatus for producing plastic films and an associated improved method are distinguished, inter alia, by the following features: —the control apparatus has two stages or at least two stages, —the control apparatus comprises, for this purpose, a sensor module and/or a sensor model and a process module and/or a process model, —the machine-dependent sensor module and/or sensor model and the production-dependent process module and/or process model are linked or can be linked to one another via production variables, —adjustable machine variables are connected or linked to plant production variables via the sensor module and/or the sensor model.

Abstract: In a linear-motor-driven transport installation, in particular a linear-motor-driven simultaneous stretching installation, the tenter-clip carriage return section (10) is divided into at least three zones, namely a first speed-changing zone (17), a following transporting zone (19) and a subsequent braking zone (21). The length of the speed-changing zone (17) and the braking zone (21) is together less than 40% of the overall length of the return section (10). Only in the speed-changing zone (17) and/or braking zone (21) are more powerful drive devices provided than in the other part of the return section (10), in order to subject the carriages there to a more intense change in speed.

Abstract: An improved control device for linear-motor-driven equipment, in particular for the drive of tenters of a film stretching plant, has a central control device (1) and a multiplicity of converters (11) that are activated thereby, at least indirectly. An improvement is achieved by a phase profile, which describes a relationship between the phase angle, the current amplitude and a clock pulse, for activating the stator winding (7) in a relevant zone (5), being able to be predefined for the converters (11), and by the corresponding phase-profile data for the activation of the stator winding (7) being able to be calculated and/or generated in the converters (11). In addition, a synchronization device, via which the time signals in the converters can be synchronized with one another during operation, is provided.