Windmoeller & Hoelscher Kg

Windmoeller and Hoelscher

Reinhard Paetzold

Ulrich Krause

An operating panel for a film extrusion plant displays the spatial relationship of operating elements of the plant relative both to each other and to an operator viewing the display. The panel has a terminal for inputting functional parameters of the operating elements, such as an extruder, a film bubble, a nozzle, a blowing head, a winding section, or a resin hopper or dosimetry unit associated with the extruder. The panel has an indicator that displays both the parameters and an at least two-dimensional view of the spatial relationship of the operating elements.

Two-dimensional depiction of components of a film extrusion system on an output device

A process to purge film extrusion systems with at least one extruder for the purpose of changing batches, wherein the speed is changed periodically in at least that part of the extruder in which the material is changed. By considering the mass flow rate of the film extrusion system, advantageous improvements of the process avoid the situation in which the film tears off. To this end, at least one selected guide extruder is operated at a speed which is increased as compared to the normal operation, and at least one selected downstream extruder is operated at a speed that is decreased as compared to the normal operation. Also included are control and operating units and extrusion systems to carry out the process, which include, among other things, the elements necessary for an automated program run of the purging program and the optical display of the parameters of the same.

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Osnabrueck, Germany

Reinhard Paetzold