Method for making a radial ply tire in a single building stage

Details Method for making a radial ply tire in a single building stage Method for making a radial ply tire in a single building stage

B - Operations, Transporting

60

C

154/55, 152/94

B60C 9/18 (2006.01) B29D 30/22 (2006.01) B60C 9/20 (2006.01) B60C 9/22 (2006.01)

Patent

CA 1064805

Abstract of the Disclosure A method for making a steel belted radial ply tire having a 0° cap band in a single stage is disclosed. Two plies of body tire cords are wound around a tire building drum to form a cylindrically shaped body layer, the body tire cords extending substantially parallel to the axis of the drum. Two plies of bias angled substantially in- extensible steel breaker tire cords are then serially wrapped around the radially outer surface of the body layer to form a breaker, the breaker tire cords being parallel in each ply and oppositely disposed in the two plies and form- ing an angle of between about 30° and about 70° with the plane orthogonal to the axis of the drum. A strip of high "soft stretch" reinforcing cord tape is then helically wound around the radially outer surface of the breaker for a select- ed plurality of full turns at an angle of substantially 90° relative to the axis of the drum, to form a cap band having a desired axial width, the tape being made up of a plurality of substantially inextensible cords disposed in side by side re- lation to one another and being longitudinally extensible pre- ferably by between about 30% and about 75% without stretching the cords thereof. A tread slab is then wrapped around the radially outer surface of the cap band so as to provide a raw, cylindrically shaped, tire carcass having a diameter which is substantially less than the diameter of the crown region of the corresponding cured, toroidally shaped, completed tire.

270837

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