Patent ID: 8287675

Claim:
A method for improving the uniformity of a cured tire comprising the steps of: Choosing a uniformity vector to be optimized, the vector representing one or more harmonics of the after cure uniformity waveform of the tire; determining a vector component for each of: constant-magnitude uniformity effects imparted by a second stage building drum to every tire it is used to build, constant-magnitude uniformity effects imparted by a belt/tread building drum to every tire it is used to build, and constant-magnitude uniformity effects imparted by a belt/tread transfer device to every tire it is used to build; determining a vector component for the-uniformity vector due to the radial runout of an uncured carcass by taking a measurement of the carcass radial runout and then performing a vector multiplication operation on this measured radial runout; determining a vector component for the uniformity vector due to the radial runout of an uncured belt/tread assembly by taking a measurement of the belt/tread assembly radial runout and then performing a vector multiplication operation on this measured radial runout; controlling the loading azimuth angle of the uncured carcass onto the second stage building drum so that the constant-magnitude uniformity effect imparted by the second stage building drum will be oriented such that it minimizes the vector; controlling the loading azimuth angle of the belt/tread assembly onto the transfer device so that the constant magnitude uniformity effect imparted by the transfer device will be oriented such that it minimizes the vector; and constructing an uncured green tire so that it has a desired vector component by joining the belt/tread assembly at a predetermined optimal azimuth angle onto the carcass.