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"&lt;p&gt;Unusual tapered openings through the flights of a deep-channeled cooling screw  can raise the output of extruded polystyrene foam sheet and planks by as much  as 70%. So says the inventor of the patented Turbo-Cool screw, Jim Fogarty,  president of Plastic Engineering Associates Inc. in Boca Raton, Fla. Turbo-Cool  is believed to be the first screw to use cross-flight holes, which Fogarty says  contribute better mixing and heat transfer while using less energy.&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ptonline.com/articles/holes-in-the-screw-flights-boost-ps-foam-output>