Tire comprising at least two bracing plies with a reduced porosity area

The tire design with reduced porosity shrink-fit layers using torsionally balanced multifilament strands addresses rigidity and corrosion issues, improving durability and manufacturing ease.

WO2026124919A1 Publication Date: 2026-06-18MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
Filing Date
2025-11-17
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Tires with shrink-fit reinforcement layers face challenges in managing rigidity during manufacturing and are prone to corrosive agent penetration and oxidation due to high porosity, which affects their durability and performance.

⚗Method used

The tire design incorporates at least two shrink-fit layers with reduced porosity surface area, using multifilament strands of aromatic and aliphatic polyamides wound helically and torsionally balanced, to minimize water transmission and oxidation risk.

🎯Benefits of technology

The reduced porosity surface area significantly reduces water transmission and oxidation, enhancing tire durability and manufacturing manageability while maintaining performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to a tire (10) comprising a crown reinforcement (14) comprising a bracing reinforcement (17) comprising at least two bracing plies (19; 19'), each of the bracing plies comprising at least a plurality of bracing reinforcement elements in which: - each bracing reinforcement element comprises a plurality of multifilament strands; and - the porosity area of each bracing reinforcement element strand is less than or equal to 100 000 µm2, the porosity area being calculated using a measurement device allowing geometries to be measured in scanned and calibrated images from an optical element and lighting systems allowing the porosity area of the reinforcement element to be revealed.
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