Method for setting the sizes of blown film tubes as well as a blown film plant comprising a control device for implementing said method

摘要

A method for setting the sizes of film tubes extruded by blown film plants includes changing the film tube size from an initial size to a final size, and optimizing the location of a frost area during the size change by setting the output of a cooling fan. Physical parameters of the initial and final size of the film tube are stored in a control device. The control device takes these physical parameters into account when generating control signals. The control signals form the basis for the control of the cooling fan output.

主权项

1. A method of setting a size of a film tube extruded by a blown film plant in which the size of the film tube is changed from an initial size to a final size, said method comprising:
optimizing a location of a frost area during the size change by setting an output of at least one of a plurality of cooling fans; storing physical parameters of the initial and final size of the film tube in a control device; and generating control signals from the control device for controlling the output of the at least one of the plurality of cooling fans, the film tube size change being implemented in a time-shifted manner for components of the plant, each of which has a setting that can be changed, the setting change of each of the components being made successively in a sequence corresponding to the sequence in which the components of the plant influence the extruded film in a conveying direction (z) thereof.