Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1984-09-28
1988-08-30
Ball, Michael
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156909, B29D 3058
Patent
active
047674806
ABSTRACT:
An apparatus and method for cold retreading or recapping of the running surface of a vehicle tire. A rubber, rope and cloth sectioned mold is produced utilizing a new tire male mold covered with perforated polypropylene film, uncured rubber with nylon rope at its edges and highly stretchable cloth enclosed in an envelope and cured by application of pressure and heat. A male mold is used to make the final female mold directly, or to make an intermediate mold which is used to produce a tread ring that is stretched to form a larger diameter male mold from which a final mold is prepared. The final mold is then sectioned to form one discontinuous section or two or more sections. Conveniently, one section from one size tire may be fitted with a section or sections from other size tires to form a mold to recap a third size tire. Additionally, radial inserts having the radial cross sections of the mold sections may be added to accommodate various tire sizes. The final mold thus produced is then utilized in recapping tires by fitting and fastening its sections and/or inserts around a prepared tire carcass coated with cement, a layer of uncured rubber, and a sheet of perforated polypropylene film. The mold and tire assembly is then enclosed in an envelope and placed in a chamber where curing of the rubber layer is accomplished by inflation of the tire carcass, evacuation of the envelope, pressurization of the chamber and application of heat.
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Ball Michael
Chauza Roger N.
Long Mile Rubber Company
Mills Jerry W.
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