Patent ID: 7931768
Filing Date: 2011-04-26
Classification: B29D

Abstract:
1. A method for building a radial tire comprising: building a belt package on a build-up drum having a cylindrical outside circumference; building a carcass tube having an airtight inner layer, at least one carcass ply and two bead cores with core profiles; transferring the carcass tube to a segmented building drum arranged between axially movable core clamping devices each comprising an inflatable bellows, the outsides of the building drum segments forming the outside of the building drum; transferring, with a transferring device having an inflatable collar, the belt package to the building drum and positioning the belt package over the carcass tube; expanding the building drum; joining the carcass tube to the belt package using the building drum and the transferring device such that a contour of the belt package is shaped in a manner in which a zenith of the belt package is stretched by expansion movement of the building drum against the inflatable collar and shoulder areas of the belt package are compressed by expansion of the inflatable collar of the transferring device, said inflatable collar extending from one side of the belt package to another side of the belt package and the diameter of said building drum, when expanded, being larger in the zenith and smaller in the shoulder areas than an inside diameter of the belt package prior to the belt package being shaped; and winding plies of bandage strips over an entire width of the belt package while the belt package is arranged on the building drum, wherein the belt package is contoured or shaped on the building drum during the joining and before the winding.