Hybrid cord and method of preparing the same
AssigneeHs Hyosung Advanced Materials Corporation
InventorsByung Jun AN, Kyoungha LEE, Cheol KIM, Jin-Kyung PARK
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Abstract
The present invention resolves the unevenness caused by the difference in fineness of two different yarns by pre-ply twisting a low-modulus first yarn, thereby reducing the modulus difference in the twist index between the low-modulus first yarn and the high-modulus second yarn, thereby ensuring functional uniformity, and discloses a hybrid cord and a method for preparing the same which has not only high Breaking Strength but also strong adhesion to rubber and excellent fatigue resistance properties, thereby enabling high performance and lightweight tires to be realized.
Claims11
A hybrid cord comprising a pre-ply twisted low modulus first yarn and a non-pre-ply twisted high modulus second yarn having higher modulus compared to the first yarn which are simultaneously ply twisted and cable twisted together, wherein a ratio (K1/K2) of a first twist index (K1) calculated by the following formula 1 to a second twist index (K2) calculated by the following formula 2 is 0.94 to 1.24, and a Breaking Strength utilization rate of the hybrid cord is 70% or more:
- K
-
- 1
- =
- (
- T
-
- 1
- +
- T
-
- 2
- )
- /
- 1
-
- 0
- ×
- A
- 0
- .
- 5
- [
- Formula
-
- 1
- ]
- T1:
- Ply twist number of the first yarn
- T2:
- Pre-ply twist number of the first yarn
- A:
- Denier of the first yarn
- K
-
- 2
- =
- T
-
- 3
- /
- 10
- ×
- B
- 0.5
- [
- Formula
-
- 2
- ]
- T3:
- Ply twist number of the second yarn
- B:
- Denier of the second yarn.
A method of preparing a hybrid cord, the method comprising:
- preparing two or more types of yarns having different modulus, wherein the modulus of the first yarn is smaller than the modulus of the second yarn;
- pre-ply twisting the first yarn;
- producing a plied yarn by simultaneously performing ply twisting and cable twisting on a pre-ply twisted first yarn and a non-pre-ply twisted second yarn;
- and
- producing a dip cord by immersing the plied yarn in an adhesive solution and then drying and heat-treating the plied yarn;
- and
- wherein a ratio (K1/K2) of a first twist index (K1) calculated by the following formula 1 to a second twist index (K2) calculated by the following formula 2 is 0.94 to 1.24:
- K
-
- 1
- =
- (
- T
-
- 1
- +
- T
-
- 2
- )
- /
- 1
-
- 0
- ×
- A
- 0
- .
- 5
- [
- Formula
-
- 1
- ]
- T1:
- Ply twist number of the first yarn
- T2:
- Pre-ply twist number of the first yarn
- A:
- Denier of the first yarn
- K
-
- 2
- =
- T
-
- 3
- /
- 10
- ×
- B
- 0.5
- [
- Formula
-
- 2
- ]
- T3:
- Ply twist number of the second yarn
- B:
- Denier of the second yarn.
Dependencies are inferred from the claim text.