B - Operations – Transporting – 29 – C
Patent
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.
Lenius Steven J.
Louks John W.
Swanson Ronald P.
Will Eugen
Minnesota Mining And Manufacturing Company
Smart & Biggar
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