Patent ID: 9073277
Filing Date: 2015-07-07
Classification: B29D,B60C,Y10T

Abstract:
1. A method for controlling the discharge of fluids during a process for vulcanisation and moulding of a green tyre, said fluids being interposed between a radially external surface of a pressing bladder and a radially internal surface of the green tyre, comprising: building said radially internal surface of the green tyre, wherein the building comprises winding a continuous elongated element of elastomeric material into a plurality of coils confining circumferential grooves along a rolling direction of the tyre; and disposing said circumferential grooves into fluid communication with discharge channels present in said radially external surface, wherein “L” represents a half-width in an axial direction of a belt structure associated at a radially external position with a carcass structure of the green tyre, as measured from the equitorial plane of the green tyre, wherein “H” represents a section height of the green tyre, as measured from a radially inner most bead area of the tyre, said circumferential grooves extending only throughout two discrete axially-opposed portions of the radially internal surface of the green tyre, each discrete axially-opposed portion of the radially internal surface of the green tyre being defined by a region on the internal surface of the tyre extending from 90% of the respective “L” half-width of that discrete portion's axial side of the tyre to 20% of the respective “H” section height of that discrete portion's axial side of the tyre; and wherein the discharge channels present in the radially external surface of the pressing bladder extend only throughout two discrete axially-opposed portions of the bladder, each discrete axially-opposed portion of the bladder being defined by, during the moulding, being in contact with a respective one of the regions on the internal surface of the tyre extending from 90% of the respective “L” half-width of that discrete portion's axial side of the tyre to 20% of the respective “H” section height of that discrete portion's axial side of the tyre.