Patent ID: 7670449
Filing Date: 2010-03-02
Classification: B29D

Abstract:
1. A method of building a tire having a carcass, tread portion in a crown region and a pair of sidewalls, wherein the sidewalls are connected to the tread portion by shoulder regions, comprising the following steps: providing a tire building drum; building the carcass by laying an inner liner on said drum, applying a first layer of ply on the right hand side of the drum so that a first end of the first ply layer is located over a first bead area while the second end of the first ply layer extends laterally outwards therefrom, applying a first bead over the first bead area and ply end; applying a second layer of ply on the left hand side of the drum so that one end of the second ply layer is located over a second bead area, while the second end extends laterally outwards therefrom; applying a second bead over the second bead area and end of second ply layer; applying a third layer of ply having lateral ends extending from said first bead to said second bead, and wherein the lateral ends of the third layer of ply do not wrap around said bead; folding the second end of the first layer of ply over the first bead and into contact with the third layer of ply, folding the second layer of ply over the second bead so that the second end of the second layer of ply is in contact with the third layer of ply, and shaping the carcass into a toroid; and forming the tire such that the first layer of ply of the carcass and the second layer of ply of the carcass each extend from the respective first and second bead areas up the respective sidewall to the respective second end located in the respective shoulder region without extending in the crown region.