Transporting a film tube, blown film line and method for producing a film
AssigneeWindmoller & Holscher
InventorJens Althermeler
Life of this patent
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Abstract
The invention relates to a system (10) for transporting a film tube (2) in a blown film line (1) along a transport direction, having a guiding unit (51) for guiding the film tube (2), a bottleneck (13.1) at which a width (2.3) of the film tube (2) can be reduced, a severing apparatus (20) having at least one severing element (21) for severing the film tube (2), wherein the guiding unit (51) is arranged downstream of the bottleneck (13.1) in the transport direction of the film tube (2). The invention furthermore relates to a blown film line (1) and to a method (100) for producing a film.
Claims13
A system for transporting a film of a blown film line along a transport direction, comprising
- a processing unit with a guide unit for guiding a film tube and a constriction point at which a width of the film tube is reduced, and
- a cutting device with at least one cutting element,
- wherein said cutting device has an actuation means for moving the at least one cutting element in the direction of the film tube and
- wherein said cutting device has:
- at least several cutting elements arranged in series, or
- a transverse drive for moving the at least one cutting element transversely to the transport direction of the film tube,
- wherein the guide unit is arranged downstream of the constriction point in the transport direction of the film tube,
- wherein the cutting device is configured in such a way that only a first tube side of a tube section of the film tube is cut by the at least one cutting element, so that air accumulated at the processing unit is released through the tube section.
A blown film line for the production of a film with a blow head from which a film tube is extruded, and a system, for transporting the film tube along a transport direction, comprising:
- a processing unit with a guide unit for guiding the film tube and a constriction point at which a width of the film tube is reduced, and
- a cutting device with at least one cutting element for cutting the film tube,
- wherein the guide unit is arranged downstream of the constriction point in the transport direction of the film tube,
- wherein the cutting device is configured in such a way that only a first tube side of a tube section of the film tube is cut by the at least one cutting element, so that air accumulated at the processing unit is released through the tube section of the film tube;
- wherein said cutting device has an actuation means for moving the at least one cutting element in the direction of the film tube;
- wherein said cutting device has at least several cutting elements arranged in series or a transverse drive for moving the at least one cutting element transversely to the transport direction of the film tube.
Dependencies are inferred from the claim text.