KAYA BAHADIR (TR)
ARIFOGLU YENMEZ MUGE (TR)
US20160297245A1 | 2016-10-13 | |||
US20130183483A1 | 2013-07-18 | |||
US20140216625A1 | 2014-08-07 | |||
US20150292124A1 | 2015-10-15 | |||
JP2009067323A | 2009-04-02 | |||
JP2016138345A | 2016-08-04 |
CLAIMS A cap ply reinforcement strip (1), which is wound spirally on the belt package of a radial tire such that it will have 0° to 5° with the equatorial plane and it is in direct contact with the tread rubber, comprising warp yarns (3) and cotton weft yarns (2) wherein surface of the said strip is dipped with an adhesive material characterized in that - the plurality of the said cotton weft yarns (2) parallel to each other wherein the linear density of which changes between 400 and 2000 dtex, and the said adhesive material content on the said strip surface is at least 10% and maximum 60% by weight. A cap ply reinforcement strip (1) according to claim 1 characterized by the linear density values of the said cotton weft yarns (2) are between 600 to 1500 dtex. A cap ply reinforcement strip (1) according to any one of the preceding claims characterized by the said cotton yarns (2) used as weft are twisted or non-twisted. A cap ply reinforcement strip (1) according to any one of the preceding claims characterized by the number of the said cotton weft yarns (2) in a 10 cm long strip (1) is between 5 to 50, preferably 10 to 20. A cap ply reinforcement strip (1) according to claim 1-2, characterized in by the said adhesive material is RFL (Resorcinol Formaldehyde Latex). A cap ply reinforcement strip (1) according to claim 1-2, characterized by the said adhesive material does not contain any resorcinol formaldehyde (Resorcinol Formaldehyde Free). 7. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by said adhesive material content is between preferably 10% to 40 or more preferably 10% to 25% by weight. 8. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by the width of the said strip is between 5 to 30 mm. 9. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by the width of the said strip is between 8 to 15 mm. 10. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by the number of the said warp yarns or the cords (3) is 3 to 15 in a width of 10 mm. 11. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by a cord twisting degree of the said warp yarns (3) is between 100 and 800 twist/meter (tpm). 12. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by a cord twisting degree of the said warp yarns (3) is between 250 and 350 tpm. 13. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by a number of the said cotton weft yarns (2) is 5 to 50, preferably 10 to 20 in a strip (1) having the length of 10 cm. 14. A cap ply reinforcement strip (1) according to any one of the preceding claims, characterized by the said warp yarns (3) are comprising of nylon 6.6, PET (polyethylene terephthalate), aramide cords or hybrid cords such as PET-nylon 6.6, aramide-nylon 6.6 or aramide-PET. |
Field of the Invention
The present invention relates to a cap ply reinforcement strip which is ready to use plain woven with high dtex cotton weft yarns in pneumatic radial tires.
Background of the Invention
In radial tires, it is known that the cap ply reinforcement strip, which is wound on the belt package by making a small angle with the equatorial plane in order to form a cap ply, which improves performance of the radial tire especially at high speeds.
Winding nylon 6.6, PET (polyethylene terephthalate), hybrid (Aramide+Nylon 6.6, Aramide+PET) cords spirally as cap ply reinforcement layer on the belt package as strips has been applied for many years by several tire companies in order to improve high speed durability and handling performance in pneumatic radial tires. The said cord strips are obtained by cutting the calendered (rubberized) cord fabric in strips or rubberizing parallel single cords in a certain width during extrusion process without weft.
Low linear density (100-300 dtex) weft yarns which are used for the production of tire cord fabrics do not have any effect on tire performance and the only purpose of the usage of these weft yarns is to hold the warp yarns or cords together as parallel to each other.
The use of cotton weft yarns are known from the state of the art, JP2009067323 patent discloses use of cotton weft, having a linear density of which changes between 200 and 400 dtex. But the patent document is not considered as it is related to reinforcement strip.
The Japanese patent document no JP2016138345, an application known in the state of the art, discloses use of weft, polyester, or polyester may be coated composite yarn is used in cotton, having a linear density of which changes between 100 and 400 dtex. Also the said application disclosed in the said patent document is not considered as it is related to a reinforcement strip. Summary of the Invention
The objective of the present invention is to provide a cap ply reinforcement strip which is obtained by plain weaving the warp cords with the cotton weft yarns with high linear density for pneumatic radial tires.
Another objective of the present invention is to prevent excessive narrowing of the width of the tire cord fabric during heat-set process. When compared with texturized nylon weft yarns, the cotton weft yarns with high linear density narrow to half of the narrowing of texturized nylon weft yarns.
A further another objective of the present invention is to provide a lateral (transverse) warp cord separation (fraying) resistance from the weft yarns during cutting (slitting) process of the strip preparation and during strip winding process on the belt package.
Detailed Description of the Invention
"Cap ply reinforcement strip for pneumatic tires" developed to fulfill the objective of the present invention is illustrated in the accompanying figure wherein, Figure 1 is the zoomed, top view of the cap ply reinforcement strip according to the invention.
The components given in the figure are numbered and the numbers refer to the following:
1. Cap ply reinforcement strip
2. Cotton weft yarn
3. Warp yarn A cap ply reinforcement strip (1), which is wound spirally on the belt package of a radial tire such that it will have 0° to 5° with the equatorial plane and it is in direct contact with the tread rubber, characterized in that
- plurality of cotton weft yarns (2) parallel to each other having a linear density of which changes between 400 and 2000 dtex, and
- the adhesive content on strip surface is at least 10% and maximum
60% by weight.
The cap ply reinforcement strip (1) of the present invention, which eliminates calendering and strip preparing stages and enables to reduce rolling resistance of the tire and the fuel consumption by avoiding the requirement for rubber coating thereon, comprises an adhesive dip on its outer surface that is required for tire production process.
In the preferred embodiment of the invention, the cotton weft yarns (2) and the warp yarns are fixed to each other with adhesive dipping material, and thus a strong bond is formed on contact points of the cotton weft yarn (2) and the warp cords (3) and warp cord (3) in the strip (1) is prevented from shifting aside and separating. The adhesive material used in one embodiment of the invention is RFL (Resorcinol Formaldehyde Latex), but RF-free adhesives can be also used. The cotton weft yarns (2) absorb the adhesive material easier than polyamide texturized yarnsdue to their hydrophilic nature, this increases the resistance and stability of cap ply reinforcement strip (1) in the tire under dynamic conditions. The width of the inventive cap ply reinforcement strip (1) varies between 5 to 30 mm, preferably 8 to 15 mm. The number of warp yarn (3) present in the 10 mm width of the cap ply reinforcement strip (1) may vary between 3 to 20. The twist numbers of warp cords (3) are between 100 to 800 twist/meter (tpm), preferably 250 to 350 tpm. If the twist numbers of warp cords is less than 100 twist/meter (tpm), the fatigue performance of warp yarns decreases. On the other hand, when the twist numbers of warp cords is exceeds 800 twist/meter (tpm), the breaking strength of warp yarns decreases.
The warp cords (3) used in the inventive cap ply reinforcement strip (1) can be comprised of hybrid cords such as PET-nylon 6.6, aramide-nylon 6.6 or aramide- PET as well as it can be comprised of nylon 6.6, PET (polyethylene terephthalate), or aramide cords.
The linear densities of the cotton weft yarns (2) can vary between 400 to 2000 dtex, preferably 600 to 1500 dtex. If the linear densities is less than 400 dtex, there is concern that cotton weft yarns can not hold the warp yarns or cords together as parallel to each other cap ply reinforcement strip form during cutting process. On the other hand, when the linear densities is exceeds 2000 dtex, the cap ply reinforcement strip gains excessive adhesive content, there is a concern that air voids occur frequently in the tire manufacturing process.
The cotton yarns (2) used as weft can be twisted or non-twisted. The twist number of cotton weft yarns (2) can be 0 to 600, preferably 200 to 500. The number of cotton weft yarns (2) in a 10 cm long strip (1) can be 5 to 50, preferably 10 to 20. If the number of cotton weft yarns in a 10 cm long strip is less than 5, there is concern that cotton weft yarns can not hold the warp cords together as parallel to each other cap ply reinforcement strip form during cutting process. On the other hand, when the number of cotton weft yarns in a 10 cm long strip is exceeds 50, the cap ply reinforcement strip gains excessive adhesive content, there is a concern that air voids occur frequently in the tire manufacturing process.
The amount of the adhesive dip in the cap ply reinforcement strip is between 10% to 60%, preferably 10% to 40 or more preferably 10% to 25% by weight. If the amount of the adhesive dip in the cap ply reinforcement strip is less than 10%, there is concern that green tackiness performance can be observed during tire manufacturing process. On the other hand, when the amount of the adhesive dip in the cap ply reinforcement strip is exceeds 60%, the cap ply reinforcement strip gains excessive adhesive content, there is a concern that air voids occur frequently in the tire manufacturing process.
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