An apparatus is adapted to form a plurality of apertures in a panel made from a meltable foamed plastic material. The apparatus has a movable panel support device for supporting said panel and a heating array. The heating array has a plurality of heating elements mounted to a support frame. The heating...http://www.google.com.au/patents/US20040104504?utm_source=gb-gplus-sharePatent US20040104504 - Method and apparatus for forming apertures in foamed polystyrene and other foamed plastic panels
