B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/522
B29C 55/28 (2006.01) B29C 47/00 (2006.01) B29C 47/92 (2006.01)
Patent
CA 2275838
An improved blown film extrusion apparatus is provided. The apparatus includes an annular die for extruding a film tube. At least one tube position transducer is provided and located adjacent to the extruded film tube. The tube position transducer transmits interrogating pulses to the extruded film tube and produces a position signal corresponding to a detected position under the extruded film tube. A bubble position control system is provided for receiving and processing the position signal. A valve is provided for varying a quantity of air within the extruded film tube in response to the bubble position control means. This urges the extruded film tube to a desired position. The apparatus further includes a collapsing frame assembly for receiving the extruded film tube and collapsing it. The collapsing frame assembly includes several frame boards. Typically, two opposing main boards and two opposing side boards are provided. A position transducer is provided for detecting the position of at least one of the frame boards. Preferably, this is a non- contact sensor. At least one board position actuator is provided for adjusting the position of at least one of the boards. Typically, the actuator is an electric motor. A board control system is provided for receiving the board position information from the board position transducer and for providing control signals to the board position actuator to maintain at least one of the boards in a predetermined position.
Buttel Ulrich
Joseph Daniel R.
Joseph Daniel R.
Smart & Biggar
LandOfFree
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