×

Process for molding and vulcanizing tires and other rubber articles

  • US 4,863,650 A
  • Filed: 05/03/1988
  • Issued: 09/05/1989
  • Est. Priority Date: 10/16/1982
  • Status: Expired due to Term
First Claim
Patent Images

1. Process for molding and vulcanizing tyres and other rubber articles, in which in a press with the aid of a bladder negative shapes are pressed into a tyre blank under high pressure and vulcanization is performed, comprising the steps of applying to the outside surface of the bladder a solvent which swells said surface, providing on the swollen outside surface of the bladder a cross-linked, hardened, tightly adhering, elastic release agent film bonded to the bladder by chemical interactions before molding and vulcanization are performed, and conducting at least 300 molding and vulcanizing cycles without recoating the bladder with the release agent film, the release agent film on the outside the bladder comprising more than one thin coating, each such coating produced by the steps of (a) coating the outside of the bladder with an organic solvent solution comprising a mixture of a silicone release agent and a moisture or heat curable silicone rubber and (b) exposing the coated mixture to moisture or heat to effect curing thereof.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×