METHOD FOR SETTING THE SIZES OF BLOWN FILM TUBES AS WELL AS A BLOWN FILM SYSTEM WITH A CONTROL DEVICE FOR CARRYING OUT THE METHOD

摘要

The invention describes a method for setting the sizes of film tubes (1),which are extruded by blow filmplants (15), in which method the film tube size is changed from an initialsize of a film tube (1) to a finalsize of a film tube (1), and in which the location of the frost area (3) isoptimized during the size changeby setting the output of the cooling fan.Physical parameters of the initial and final size of the film tube (1) arestored in the control device (31).The control device (1) takes these physical parameters into account whengenerating control signals.Furthermore, these control signals form the basis for the control of thecooling fan output