B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/64 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01) B29C 49/78 (2006.01) B29C 55/28 (2006.01)
Patent
CA 2150898
A blown film extrusion system includes an annular die for receiving a molten material and extruding a film tube. At least one cooling air ring is positioned adjacent to the annular die for passing an air stream along a particular surface of the film tube. In particular embodiments, this cooling air ring may provide a cooling air stream for either an exterior surface of the extruded film tube, an interior surface of the extruded film tube, or for both an exterior surface and interior surface of the extruded film tube. A blower is provided for entraining and supplying cooling air or gas to the at least one cooling ring. A flow sensor is positioned in an air flow path intermediate the at least one cooling ring and the blower. The flow sensor provides an air mass flow signal which is indicative of air flow through the air flow path, and which provides a measure of air mass flow per unit time. An adjustable air flow attribute modifier is also provided in communication in the air flow path. The adjustable air flow attribute modifier is utilized for selectively modifying the air mass per unit time. A controller member is provided which is in communication with both the flow sensor and the adjustable air flow attribute modifier. The controller member receives the mass air flow signal from the flow sensor, and provides a control signal to the adjustable air flow attribute modifier, to provide a preselected value of air flow in terms of air mass flow per unit time.
Joseph Daniel R.
Smart & Biggar
LandOfFree
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