PEAL: Patented screw for foam extrusion

James D. Fogarty, chairman of Plastic Engineering Associates Licensing, USA, recently obtained a U.S. patent relating to his Turbo-Screws technology for thermoplastic foam extrusion. According to a statement by the company, the patent grants exclusive rights to Fogarty for the manufacture and use of any type of aperture other than a perfectly round hole in the flights of a screw for foam extrusion. “Field tests have confirmed my own calculations that perfectly round holes in the flights of feed screws do not work in foam extrusion. They do not promote cross-channel flow like Turbo-Screws technology.

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