Method and device for producing a film made of a thermoplastic material
AssigneeReifenhauser GmbH & Co. Maschinenfabrik
InventorsEike Wedell, Helmut Meyer
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Abstract
A method and a device for producing a film made of a thermoplastic material, wherein a plastic melt is blown up into a film bubble and is shaped into a desired film by a calibrating arrangement, and a downstream arranged flattening device. For providing as contactless as possible a guidance, calibration and flattening, film guidance elements are used with a laminar uniform air cushion between the film guidance element and the surface of the film bubble, without contact between the surface of the film bubble and the film guidance element.
Claims23
A device for producing a film made of a thermoplastic material, having at least one extruder with a blow head (1) for an emergence of a film bubble (4) from a plastic material, a calibrating device (20) acting on an exterior of the film bubble (4) and a flattening device (3) for the film bubble (4) arranged downstream of the calibrating device (2), at least one of the calibrating device (2) and the flattening device (3) having film guidance elements (5) chargeable with an airflow, wherein air outlet openings for an exit of the supplied air flow are in an area of the surface of the film guidance elements facing the film bubble (4), the device comprising:
- a surface of each of the film guidance elements (5) facing the film bubble (4) and formed by an air-permeable microporous layer of a mean pore size of 5 to 100 μm and a plurality of support arms (21, 31) each carrying on a free end adjoining an outer circumference of the film bubble (4) a film guidance element (5) and each of the film guidance elements (5) being provided with an air inlet opening (55).
Dependencies are inferred from the claim text.