B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/04 (2006.01) B29C 47/20 (2006.01) B29C 49/78 (2006.01) B29C 55/28 (2006.01) B29D 23/00 (2006.01)
Patent
CA 2330955
An apparatus for producing an extruded film tube and supplying said tube to a collapsing and roller assembly includes a die for extruding a molten material in the form of a tube which is in a molten state below a frost line and in a solid state above the frost line. A blower system supplies and exhausts cooling air to and from an interior portion of the tube, and is regulated by a valve. At least two sensors are provided, one below the frost line for sensing the position of said tube, and a non-contact sensor located proximate the tube in a position above said frost line. The non-contact sensor is used for sensing the position of the tube prior to collapsing and flattening it. A controller receives feedback signals from both sensors and controls operation of the valve.
Joseph Daniel R.
Smart & Biggar
LandOfFree
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