| 摘要 |
PROBLEM TO BE SOLVED: To provide an extrusion device having an electric conductive discharge channel at a tread part and a method for producing a tire by using the device in order to improve a problem of static electricity generated upon using silica in a large amount in a tread rubber. SOLUTION: The extrusion die is mounted in a head part of the extrusion device having a Tri-extruder, which is composed of a preform die 110, a final die 120 and a cassette 130 to construct a device extruding a cap tread, an undertread and a tread wing at the same time, and extruding channels for the cap tread, the undertread and the tread wing are formed upon combining the preform die 110, the final die 120 and the cassette 130. At this stage, the electrical discharge channel is constructed in such a way that the extruding channel 113 for the undertread is passed through the channel 112 for the cap tread, whereby the undertread rubber composition is mounted to divide the space of the cap tread extruding channel 112 into two horizontal parts. COPYRIGHT: (C)2005,JPO&NCIPI |
