Rubber Extrusion
Extruding rubber materials requires special screws and techniques. (RDC 10/20/2009)
When a rubber material is to have a fixed cross-section, such as a tire tread or a side wall, an screw extruder is generally used. For instance, in the step of extruding a tire tread, a kneaded and blended rubber material is heated with a warming mill and sent to an extruder hopper extruded from the nozzle and cut to the required length. (Shimada, US Patent 7,811,075, 10/12/075)
Recent US Patents
10/12/2010
7,811,075
Screw for extruder and method of manufacturing the extruder, and rubber member for tire and method of manufacturing the rubber member
Shimada of Bridgestone, Japn has developed an extrusion screw for reduced rubber extrusion pulsing by a screw with the upstream flight higher than the height of the downstream flight. (RDC 1/7/2011)
9/28/2010
7,803,299
Extruded rubber profile, method for obtaining same and tire incorporating same
Lamoine and Micouin of Micelin produced a tire tread by profile extrusion with electrical conduction between inner and outer faces to minimize the effect of friction build-up of static electricity. (RDC 12/8/2010