Process for molding and vulcanizing tires and other rubber articles
First Claim
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.
3 Assignments
0 Petitions
Accused Products
Abstract
Process for molding and vulcanizing tires and other rubber articles, in which in a press with the aid of a bladder negative shapes are pressed into the tire blank under high pressure and vulcanization is performed, the surface of the bladder having applied thereon a solvent which swells the surface, the swollen bladder being provided with a cross-linked, hardened, tightly adhering, elastic release agent film bonded to the bladder by chemical interactions before carrying out molding and vulcanization to prevent sticking of the molded and vulcanized tire to the bladder, the film comprising more than one thin coating each of which is produced by coating the bladder with an organic solvent solution comprising a mixture of a silicon release agent and a moisture or heat curable silicone rubber and curing the coated mixture through exposure to moisture or heat, and conducting at least 300 molding and vulcanizing cycles without recoating the bladder with the release agent film.
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Citations
15 Claims
- 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.
Specification
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- Resources
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Current AssigneeRhein Chemie Rheinau GmbH (Lanxess AG)
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Original AssigneeTeroson G.M.B.H. (Henkel AG & Co KGaA)
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InventorsKohler, Winfried R., Fischer, Wolfgang, Wagner, Herbert
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Primary Examiner(s)Lorin, Hubert
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Application NumberUS07/189,902Time in Patent Office490 DaysField of Search264/39, 264/338, 264/315, 249/115, 106/38.22, 106/287.1, 427/133, 427/299, 427/379, 427/387, 427/393.5, 427/407.1US Class Current264/39CPC Class CodesB29C 33/64 SiliconeB29C 43/3642 Bags, bleeder sheets or cau...
