Process and system for producing tire cords
View Patent ↗A method and system of manufacturing reinforcement materials for rubber products, particularly tires. The method comprises the steps of twisting two or more yarns together to form a cable, and directly after twisting, applying and curing an adhering agent to the cable to form a treated cord. The steps of twisting the yarns and applying and curing the adhering agent are performed on one machine without intermediate take-up. The invention is also directed to a system for producing treated cord, the system comprising a one-machine twist and treat unit.
1. A method for producing a treated cord, the method comprising the steps of:
twisting two or more yarns together to form a cable; and
directly after twisting, applying and curing an adhering agent to the cable to form a treated cord;
wherein the steps of twisting the yarns and applying and curing the adhering agent are performed on one machine without intermediate take-up and wherein the cable and the treated cord are not stretched but are tension-controlled to allow for small heat shrinkage.
2. The method of claim 1 wherein the twisting step is performed by direct cabling.
3. The method of claim 1 wherein the yarn is any organic high tenacity fiber capable of being produced with properties which are satisfactory for rubber reinforcement after twisting but without extensive heat treatment.
4. The method of claim 1 wherein the yarn may be polyesters, polyamides, aramids, and other high performance polymers capable of forming high tenacity fiber.
5. The method of claim 1 wherein the yarn is a natural-based fiber.
6. The method of claim 1 wherein the yarn is a fiber made from two or more components.
7. The method of claim 6 wherein the yarn is a hybrid of two or more components fibers.
8. The method of claim 7 wherein the fibers are a mixture of polyester filaments and nylon filaments.
9. The method of claim 1 wherein the yarn is a dimensionally stable, high modulus, low shrink polyester.
10. The method of claim 1 wherein the yarn is comprised of polyester core/nylon sheath fibers.
11. The method of claim 1 wherein the yarn is a polyaramid.
12. The method of claim 1 wherein the yarn is rayon.
13. The method of claim 1 wherein the applying step comprises coating the raw cable cord with an adhering agent.
14. The method of claim 1 wherein the curing step is performed by heating.
15. The method of claim 1 wherein the adhering agent is a Resorcinal-Formaldehyde-Latex (RFL).
16. The method of claim 15 wherein the RFL contains catalytic additives for adhesion.
17. The method of claim 1 wherein the adhering agent is a latex-based system including the use of adhesion promoting or curing components.