Q&q Retreading System Ab

Stiftelsen Institutet for Mikrovagsteknik

Goran Boling

Benny Berggren

Ninneh Gripenholt

A method and apparatus for retreading vehicle tires. A carcass is provided with a prevulcanized tread and an unvulcanized tie-gum layer between the carcass and tread. A microwave applicator is located above the tread to emit microwaves against the tire for generating heat energy in the tire whereby the tie-gum layer is vulcanized. Vulcanization of the edges of the tie-gum layer is facilitated by local heating at or in connection with said edges by heat generation outside of the tire. The heating can be effected either by utilizing a material with a high dissipation factor for microwave energy or, alternatively, by use of electric resistance wires.

Method and apparatus for retreading vehicle tires

A device for microwave heating, including a wave guide, in which a material is intended to be heated, and a microwave source connected to the wave guide. The wave guide includes a portion wherein its cross-sectional area decreases continuously from the end of that portion located closest to the microwave source to the other end of the portion part, and along that portion the wave guide includes a portion with a geometry, at which fed-in microwave energy no longer can propagate in the wave guide, i.e., the wave guide proceeds continuously to so-called cut off at a certain distance from the narrower end of the part.

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Taby, Sweden

Goran Boling