Method of and apparatus for forming rubber strip materials for building tires and method of building tires

摘要

Method for forming a rubber strip which enables a wider rubber of small thickness without lowering an extruding speed and enables to reduce a building cycle time, thereby increasing the efficiency of tire manufacturing. Temperatures at a main-part casing 11 , a screw shaft 12 and a head region included with the die 13 are controlled to be different from each other in a manner that: the temperature as controlled in the main-part casing 11 is higher than that in the screw shaft 12 ; and the temperature as controlled in the head region is higher than that in the main-part casing 11 , when continuously extruding a rubber material in a form of a ribbon in forming a rubber strip 1.