Poly(ethyleneterephthalate) tire cord, and tire comprising the same
AssigneeKolon Industries, Inc.
InventorsOk-Hwa Jeon, Il Chung, Gi-Woong Kim
Life of this patent
Estimating the term…
Abstract
Disclosed is a PET tire cord which has a flat spot index (FSI) defined by the following Calculation Formula 1 of 5.0% or less: Flat Spot Index (FSI)(%)=(L1−L2)/L0×100 Calculation Formula 1 wherein, L0 is an initial length of the tire cord, L1 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while maintaining the load, and L2 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while remaining the load of 0.01 g/d only.
Claims18
A poly(ethylene terephthalate) (PET) tire cord, of which a flat spot index (FSI) defined by the following Calculation Formula 1 is 5.0% or less,
- Flat Spot Index (FSI)(%)=(L1−L2)/L0×100 Calculation Formula 1
- wherein, L0 is an initial length of the tire cord,
- L1 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while maintaining the load, and
- L2 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while remaining the load of 0.01 g/d only,
- wherein the PET tire cord comprises a drawn PET fiber prepared by drawing an undrawn PET fiber at a draw ratio of 0.1-1.55, wherein the undrawn PET fiber has a crystallinity of 25 to 40% and an amorphous orientation factor (AOF) of 0.15 or less.
A poly(ethylene terephthalate) (PET) tire cord, of which a flat spot index (FSI) defined by the following Calculation Formula 1 is 5.0% or less,
- Flat Spot Index (FSI)(%)=(L1−L2)/L0×100 Calculation Formula 1
- wherein, L0 is an initial length of the tire cord,
- L1 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while maintaining the load, and
- L2 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while remaining the load of 0.01 g/d only,
- wherein the PET tire cord comprises a drawn PET fiber prepared by drawing an undrawn PET fiber at a draw ratio of 0.1-1.24, wherein the undrawn PET fiber has a crystallinity of 25 to 40% and an amorphous orientation factor (AOF) of 0.15 or less.
A poly(ethylene terephthalate) (PET) tire cord, of which a flat spot index (FSI) defined by the following Calculation Formula 1 is 5.0% or less,
- Flat Spot Index (FSI)(%)=(L1−L2)/L0×100 Calculation Formula 1
- wherein, L0 is an initial length of the tire cord,
- L1 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while maintaining the load, and
- L2 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120° C. and cooling the same to 24° C. while remaining the load of 0.01 g/d only,
- wherein the PET tire cord comprises a drawn PET fiber prepared by drawing an undrawn PET fiber at a draw ratio of 0.1-1.55, wherein the undrawn PET fiber has a crystallinity of 25 to 40% and an amorphous orientation factor (AOF) of 0.15 or less, and
- wherein the undrawn PET fiber is prepared under conditions comprising a spinning stress of 0.85-1.25 g/d and a spinning speed at 3800-5000 m/min.
Dependencies are inferred from the claim text.