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CNC milled air ring improves air flow.

In response to rising costs for sand casting its aluminum air rings for blown film, Future Design Inc. in Mississauga, Ont., turned to CNC milling air-ring sections out of aircraft aluminum plate and then assembling the plates with epoxy and fasteners. From the outside, the new CNC-built Saturn AP 5000 air ring looks like the sand-cast Saturn air rings. But CNC milling reportedly allows better shaping of the chamber, air-flow passages, and lips, for improved air flow to cool the bubble.

The firm also uses CNC milling to make a new circular gauge-control device, dubbed "Perfect Balance." It fits under the air ring with 0.5- to 0.625-in.-wide channels and valves to control air flow manually or automatically to correct film thickness. Both devices will be shown for the first time at the Plast-Ex show in Toronto in May. Tel: (905) 361-9978 *
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Title Annotation:KEEPING UP WITH: Extrusion
Publication:Plastics Technology
Date:Mar 1, 2007
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