The machine used to extrude materials is very similar to an injection moulding machine. A motor turns a screw which feeds granules of plastic through a heater. The granules melt into a liquid which is forced through a die, forming a long 'tube like' shape. The shape of the die determines the shape of the tube. The extrusion is then cooled and forms a solid shape. The tube may be printed upon, and cut at equal intervals. The pieces may be rolled for storage or packed together. Shapes that can result from extrusion include T-sections, U-sections, square sections, I-sections, L-sections and circular sections.
One of the most famous products of extrusion moulding is the fiber optic.
Wipo Publishes Patent of Dongyang Gangchul, Song Chul Lim, Sang Woo Park, Sung Tae Kim, Jun Young Park and Gogang Aluminium for "Aluminium Alloy for Extrusion Moulding Having Outstanding Strength and Workability" (South Korean Inventors)
Apr 05, 2013; GENEVA, April 5 -- Publication No. WO/2013/047986 was published on April 4.Title of the invention: "ALUMINIUM ALLOY FOR EXTRUSION...