Apparatus and method for constraining a rotating tube of...

Details Apparatus and method for constraining a rotating tube of... Apparatus and method for constraining a rotating tube of...

B - Operations, Transporting

29

C

B29C 47/02 (2006.01) B29C 47/20 (2006.01) B29C 47/90 (2006.01) B29C 47/92 (2006.01) B29C 49/04 (2006.01) B29C 69/00 (2006.01)

Patent

CA 2105161

2105161 9216352 PCTABS00016 A constraining structure for an open tube apparatus for continuously producing a rotating elongate strip of material is disclosed. The constraining structure controls expansion of an extruded blown film tube to a desired outer diameter range after the tube is formed. The constraining structure includes a casing positionable around the tube, and an annular sleeve in the casing having a generally cylindrical central passageway adapted to receive the tube to permit movement of the tube along its longitudinal axis in a downline direction. The casing and the sleeve walls define a gas chamber with pressurized gas separate from the passageway. The gas layer along the inner surface of the sleeve is at a sufficiently large pressure to constrain the tube to the desired outer diameter while the tube solidifies and to prevent the tube from contacting the sleeve.

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