| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device for extruding tread rubber, in each of which a narrow linear zone can be formed suitably.SOLUTION: The method for extruding tread rubber is used for continuously extruding/forming the unvulcanized tread rubber TG while merging a plurality of rubber materials G with one another in a preformer 2. The cross section of the tread rubber TG includes the linear zone Ra and side part zones Rb, Rb formed on the right-and-left sides of the linear zone Ra. At a step of supplying a first rubber material G4 for forming the linear zone Ra to the space among the second rubber materials G1-G3 for forming the side part zones Rb, the first rubber material G4 is extruded into the preformer 2 from a discharge port 7d including a linear opening and discharged from the discharge port 7d while substantially fixing a speed distribution of the first rubber material G4 in the thickness direction Y so that the linear zone Ra can be formed stably in the cross section of the tread rubber TG. |
