Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1991-03-21
1992-06-23
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 403, 264564, 264566, 264146, 264310, 425140, 4253261, 425308, B29C 4792
Patent
active
051240947
ABSTRACT:
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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Lenius Steven J.
Louks John W.
Swanson Ronald P.
Will Eugen
Griswold Gary L.
Kirn Walter N.
Levine Charles D.
Minnesota Mining and Manufacturing Company
Thurlow Jeffery
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