Method and Device for the Extrusion of Tubular Films
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United States of America Patent
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Issued Date -
Sep 10, 2009
app pub date -
Aug 3, 2006
filing date -
Aug 15, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention describes-an extrusion device (1) for extruding a film tube in a direction (z) of movement, said extrusion device (1) comprising a nozzle head with an annular gap from which the film tube exits and said extrusion device (1) comprising an interior cooling device with which the extruded film tube can be cooled from the inside after its exit from the annular gap. Novel and inventive is the cooling element, which has the same cross-sectional form as the film tube and which has, in the direction (z) of motion of the extruded film tube, a surface which can be moved.
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