Hybrid cabled cord and a method to make it

• US 6,601,378 B1
• Filed: 08/31/2000
• Issued: 08/05/2003
• Est. Priority Date: 09/08/1999
• Status: Expired due to Fees

• Current Assignee: Durafiber Technologies (dft), Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Funderburk, Jeffrey Allen, Rugraff, Paul, Fritsch, Jean-Francois
• Primary Examiner(s): Calvert, John J.
• Assistant Examiner(s): Hurley, Shaun R
• Application Number:
  US09/653,571
• Time in Patent Office: 1,069 Days
• Field of Search: 572/00, 572/11, 572/15, 572/19, 572/36, 572/37, 572/38, 572/43, 572/44
• US Class Current: 57/238
• CPC Class Codes: B60C 9/005 Reinforcements made of different materials, e.g. hybrid or composite cords
• CPC Class Codes: D02G 3/28 Doubled, plied, or cabled threads D02G3/32, D02G3/36 take precedence; effect yarns D02G3/34; details of spindles, e.g. bearings D01H7/86
• CPC Class Codes: D02G 3/48 Tyre cords tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606
• CPC Class Codes: Y10T 428/2969 Polyamide, polyimide or polyester
• CPC Class Codes: Y10T 442/2008 Fabric composed of a fiber or strand which is of specific structural definition
• CPC Class Codes: Y10T 442/313 Strand material formed of individual filaments having different chemical compositions

Abstract

The present invention is directed to a hybrid cabled cord comprising: at least two yarns having different properties, and an unbalanced configuration wherein the hybrid cabled cord has improved tensile strength retention. In a preferred embodiment, one of the two yarns comprises polyethylene terephthalate and the second of at least two yarns comprises polyethylene naphthalate and the coring level is between about 3% to about 15%. The present invention is also directed to a process for making a hybrid cabled cord comprising the steps of: supplying at least two yarns having different properties to a direct cabler, and cabling the at least two yarns using the direct cabler to achieve a hybrid cabled cord having a coring level which is not zero. The present hybrid cabled cord may be used in tire cord for rubber reinforcement in passenger car tires, van tires, light truck tires, or motorcycle tires.

Claims

1. A hybrid cabled cord comprising:

at least two yarns having different properties, and

an unbalanced configuration,

wherein said hybrid cabled cord has improved tensile strength retention;

wherein one of said at least two yarns comprises polyethylene terephthalate and the second of said at least two yarns comprises polyethylene naphthalate, and

wherein the cord is further characterized by a coring level defined by the equation;

2. The hybrid cabled cord according to claim 1 wherein at least one of said at least two yarns is flat prior to being twisted into the hybrid cabled cord.

3. A tire belt comprising the hybrid cabled cord of claim 2.

4. A tire comprising a carcass wherein said carcass is reinforced with the hybid cabled cord of claim 2.

5. The hybrid cabled cord according to claim 1 wherein said hybrid cabled cord has an improved energy to break.

6. The hybrid cabled cord according to claim 5 wherein the cord is further characterized by a coring level defined by the equation:

7. The hybrid cabled cord according to claim 5 wherein the cord is further characterized by a coring level defined by the equation:

8. A conveyor belt comprising the hybrid cabled cord of claim 1.

9. A transmission belt comprising the hybrid cabled cord of claim 1.

10. Hosing comprising the hybrid cabled cord of claim 1.

11. Narrow fabric comprising the hybrid cabled cord of claim 1.

12. A hybrid cabled cord comprising:

at least two yarns having different properties, and

an unbalanced configuration,

wherein said hybrid cabled cord has improved tensile strength retention;

wherein one of said at least two yarns comprises polyethylene terephthalate and the second of said at least two yarns comprises polyethylene naphthalate, and

wherein the cord is further characterized by a coring level defined by the equation;

13. The hybrid cabled cord according to claim 12 wherein at least one of said at least two yarns is flat prior to being twisted into the hybrid cabled cord.

14. A tire belt comprising the hybrid cabled cord of claim 13.

15. A tire comprising a carcass wherein said carcass is reinforced with the hybrid cabled cord of claim 13.

16. The hybrid cabled cord according to claim 12 wherein said hybrid cabled cord has an improved energy to break.

17. A tire belt comprising the hybrid cabled cord of claim 12.

18. A tire comprising a carcass wherein said carcass is reinforced with the hybrid cabled cord of claim 12.

19. A conveyor belt comprising the hybrid cabled cord of claim 12.

20. A transmission belt comprising the hybrid cabled cord of claim 12.

21. Hosing comprising the hybrid cabled cord of claim 12.

22. Narrow fabric comprising the hybrid cabled cord of claim 12.