Patent ID: 6203641
Filing Date: 2001-03-20
Classification: B29C,B29D

Abstract:
A process for the manufacture of a tire comprising an assembly phase forming a raw blank and a vulcanization phase, in which use is made of an inflatable flexible bladder capable of retaining by adhesion the raw rubber constituting the inner skin of the tire during the assembly phase, and capable of being separated from the tire after vulcanization, comprising the following steps:inflating said bladder to a given assembly pressure so as to form a reference support for the assembly, said support, when the bladder is inflated to said given assembly pressure, having a predetermined toroidal shape controlled by reinforcement wires imbedded throughout the bladder so that under the action of the inflation pressure contoured crown and sidewall surfaces which correspond substantially approximately to the final manufactured shape imparted to the crown and sidewalls of the tire by vulcanization,controlling the shape of the outside surface of the bladder in the region which molds the bead region of the tire by pressing the bead regions with contoured shaping means,forming a raw blank directly on said contoured crown and sidewall surfaces and on the shaping means in the bead region, starting by laying down the rubber constituting the inner skin of the tire by winding a ribbon of rubber, and then progressively laying down in the required order all the desired components onto said bladder surfaces, the bladder retaining the same contoured shape throughout said forming and vulcanizing phases so as not to disturb the components deposited thereon,vulcanizing the blank on the bladder,and finally deflating said bladder and withdrawing it from the inside of the tire.