Patent ID: 9676237
Date: 2017-06-13
CPC Classifications: B29C,B29D,B29K,B29L,B60C

Claim:
1. A method for producing a pneumatic tire comprising a tread portion, the tread portion comprising a tread conductive layer that is conductive to be in continuity with a rim during assembly of the rim, and a tread rubber disposed radially outside the tread conductive layer and having an outer peripheral surface constituting a tread ground contact surface, the tread rubber comprising an annular conductive terminal portion that is disposed in a tread central region, extends upward from the tread conductive layer through the tread rubber to the tread ground contact surface, and extends continuously in a circumferential direction of the tire, the method comprising a green tire formation process comprising a winding laminate step of forming the conductive terminal portion by continuously windingly laminating a terminal strip made of conductive rubber radially outward from the tread conductive layer to the tread ground contact surface, wherein the winding laminate step comprises sequentially windingly laminating the terminal strip while causing misregistration with a pitch of a distance D in an axial direction of the tire during time that the terminal strip is wound one time, so as to allow the conductive terminal portion to have a trapezoid-shaped cross section in which a width Wa of an upper base is smaller than a width Ws of the terminal strip and a width Wb of a lower base is larger than the width Ws of the terminal strip, and wherein the width Wa of the upper base is in a range of 2 to 5 mm.