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OwnerBarbara Rampana, Roberto Sangalli +1inventors
InventorsBarbara Rampana, Roberto Sangalli, Diego Tirelli
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The present invention relates to a method of increasing the high-speed performance of a carcass structure in a tyre for vehicle wheels. The method includes: preparing at least one hybrid yarn (13) and assembling a carcass structure (2) comprising at least one carcass ply (3a, 3b) substantially built on cords (12) comprising the hybrid yarn (13). The hybrid yarn (13) comprises a plurality of filaments (14a, 15a) obtained from a first multi-filament yarn (14) of polyester and a second multi-filament yarn (15) having a decay of the modulus with the temperature lower than 20%. Each of the first multi-filament yarn (14) and second multi-filament yarn (15) comprises a plurality of individual filaments (14a, 15a). The individual filaments (14a) of the first multi-filament yarn (14) are at least partly mixed in proportions of at least 50% with the individual filaments (15a) of said second multi-filament yarn (15).
A method of increasing the high-speed performance of a carcass structure in a tyre for vehicle wheels, said method including:
A method as claimed in anyone of the preceding claims, wherein the first multi-filament yarn (14) has a decay of the modulus with the temperature, measured between 20° C. and 100° C. and at a 2% elongation, higher than about 40%.
A method as claimed in anyone of the preceding claims, wherein the second multi-filament yarn (15) is made of fibres selected from the group comprising:
A method as claimed in anyone of the preceding claims, wherein the hybrid yarn (13) comprises about 50% by weight to about 90% by weight of the first multi-filament yarn.
A method as claimed in anyone of the preceding claims, wherein the hybrid yarn (13) comprises about 10% by weight to about 50% by weight of the second multi-filament yarn.
A method as claimed in anyone of the preceding claims, wherein the hybrid yarn (13) has a starting modulus at 20° C. greater than about 1500 cN/Tex.
A method as claimed in anyone of the preceding claims, wherein the hybrid yarn (13) has a starting modulus at 20° C. greater than about 2000 cN/Tex.
A method as claimed in anyone of the preceding claims, wherein the hybrid yarn (13) has a starting modulus at 20° C. greater than about 2500 cN/Tex.
A method as claimed in anyone of the preceding claims, wherein the hybrid yarn (13) has a shrinkage, measured at 177° C., less than or equal to 4%.
A method as claimed in anyone of the preceding claims, wherein the hybrid yarn (13) is prepared by:
A tyre for vehicle wheels, comprising:
Dependencies are inferred from the claim text.