DEVICE FOR PRODUCING BLOWN FILMS
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United States of America Patent
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Issued Date -
Jun 10, 2010
app pub date -
Jun 25, 2008
filing date -
Jun 28, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A device for producing blown films, including an extrusion device generating a tubular film and a flattening device, associated with the tubular film, having two flattening elements, arranged on diametrically opposite zones of the tubular film and adjustable in relation to each other at an acute angle, for transforming the cross-section of the tubular film, which is first circular, then oval, to a double-layer film web. The device further includes a pair of draw-off rolls, mounted downstream of the flattening device, for drawing off the film web. This invention has guide blades that are interposed between the flattening elements and enclose the edge fold which is formed when the tubular film is flattened.
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