Process and apparatus for building tyres for vehicle wheels
AssigneePirelli Tyre S.p.A.
InventorsCesare Emanuele Amurri, Christian De Col
Life of this patent
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Abstract
A process for building tyres for vehicle wheels includes: forming a tyre in process, the tyre including a belt structure and depositing a tread band in a position radially external to the belt structure by winding a continuous elongated element made of elastomeric material according to axially adjacent or partially overlapped coils. During the deposition of the tread band and on at least one of the coils already wound, a conductive liquid elastomeric compound is applied, the compound continuously extended between a radially outer surface of the tread band and a radially outer surface of the belt structure to generate electrically conductive paths and free zones.
Claims8
A process for building tyres for vehicle wheels, comprising:
- forming a tyre in the process, the tyre comprising a belt structure;
- depositing a tread band in a radially outer position with respect to said belt structure by winding a continuous elongated element made of elastomeric material according to coils that are axially adjacent and/or partially superimposed;
- and
- applying, during said depositing of the tread band and on at least one of said coils already wound in a radially outer position with respect to said belt structure, a conductive liquid elastomeric compound continuously extending between a radially outer surface of the tread band and a radially outer surface of the belt structure,
- said applying generating
- electrically conductive paths formed by the liquid elastomeric compound, the electrically conductive paths connecting the radially outer surface of the tread band with the radially outer surface of said belt structure, and
- free zones on said at least one of said coils, adapted to directly adhere with a subsequent axially adjacent coil;
- wherein applying the conductive liquid elastomeric compound comprises:
- generating, by an applicator, depressions in the tyre in a pattern defined by elements in relief;
- and
- filling, by said applicator, the depressions with said conductive liquid elastomeric compound covering said elements as the depressions in the tyre are generated.
A process for building tyres for vehicle wheels, comprising:
- forming a tyre in the process, the tyre comprising a belt structure;
- depositing a tread band in a radially outer position with respect to the belt structure by winding a continuous elongated element made of elastomeric material according to coils that are axially adjacent and/or partially superimposed;
- and
- applying, during the depositing of the tread band and on at least one of the coils already wound in radially outer position with respect to said belt structure, a conductive liquid elastomeric compound continuously extending between a radially outer surface of the tread band and a radially outer surface of the belt structure,
- said applying generating:
- depressions in the tyre in the process;
- electrically conductive paths formed by the liquid elastomeric compound that fill the depressions, the electrically conductive paths connecting the radially outer surface of the tread band with the radially outer surface of said belt structure;
- and free zones on said at least one of said coils, adapted to directly adhere with a subsequent axially adjacent coil
- wherein the conductive liquid elastomeric compound is applied by an applicator, said applicator having a movable surface with a design defined by elements in relief and/or by recesses, so as to generate said depressions while the conductive liquid elastomeric compound covering said elements is applied in said depressions.
Dependencies are inferred from the claim text.