Windmoller Holscher

Windmoeller & Hoelscher Kg

Windmoeller and Hoelscher

WindmÖller & HÖlscher Kg

Ulrich Krause

Klemens Sensen

Tobias Kulgemeyer

Hans-Udo Beckmann

Jurgen Linkies

Reinhard Paetzold

Egon Kotter

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.

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

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.

Process to purge polymer or plastic melt guiding parts of film extrusion systems

A withdrawal device for a plastic tubular film is manufactured in a blowing method by an extruder. To prevent the formation of center wrinkles in the withdrawal of plastic tubular film, at least one deflection cylinder and/or angle bar has a differing diameter across its length.

Withdrawal device for a blown tubular film

Growing community of inventors

Lienen, Germany

Ulrich Krause