Patent ID: 6270606
Filing Date: 2001-08-07
Classification: B29D,B60C,Y10T

Abstract:
A method for manufacturing a pneumatic tire comprising the steps of:mounting an inner liner by rolling an inner liner rubber sheet on an outer circumference of a principal tire former having a cylindrical form and expandable into a toroidal form;forming a carcass ply by forming a tubular ply base body for said carcass ply such that a multiplicity of folding points is arranged in the circumferential direction of the tire at both outer ends of the carcass ply, at least one carcass cord is extended zigzag in the circumferential direction of the tire while being folded around the respective folding points of both outer ends alternately right and left so as to form folded portions of cord folded around the respective folding points, andsaid both outer ends of the carcass ply are provided withoverlapping portions at which said folded portions of cord adjacent to each other in the circumferential direction of the tire are overlapped andnon-overlapping portions at which said folded portions of cord adjacent to each other in the circumferential direction of the tire are spaced without overlap;forming a bead core by spirally winding a bead cord substantially continuous to the carcass cords in a small width in one or more layers on both sides of the ply base body;joining mutually a tire forming member containing a bead apex rubber to the ply base body provided with the bead core; andinflating the principal tire former to obtain a raw cover tire.