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Polyester-Nylon (PET-NY) Hybrids:
Polyester and Nylon cords have been extensively used in conventional tires. In general, Polyester is utilized in carcass of passenger car radial tires and Nylon is utilized as cap ply. Other tire applications of these materials are also available such as bias tire segments. Both materials have viscoelastic nature and the difference between mechanical properties of Polyester and Nylon is not as

high as the difference between Aramid and Nylon. Polyester has higher modulus and lower elongation at break compared to Nylon. Nylon has high breaking energy and thus absorbs energy imposed by shocks. In case of PET- NY hybrids, Polyester can contribute to the dimensional stability of hybrids, whereas Nylon can contribute to the fatigue performance within the boundaries of load/elongation curves.

Load / Elongation curves of some 2 ply PET-NY Hybrids I, J, K,L, %100 Nylon cord, and %100 Polyester cord

Retained Adhesion and Retained Breaking Strength after fatigue testing of PET-NY Hybrid Cords I, J, K, L, Nylon cord and Polyester cord.

The fatigue behaviour of Polyester - Nylon hybrids varies based on the twist level of the components and the dtex level. Optimizing the twist levels of the components of hybrids can

lead to better fatigue performance. For example at moderate twist levels like 300-350 tpm, hybrids retain the fatigue performance better than polyester cords.

Kordsa can also offer 3 ply PET-NY hybrids. Some examples are given in the table below. 3 Ply hybrids are made of either 2 ply Polyester and 1 ply Nylon or 1 ply Polyester

and 2 ply Nylon. Hybrids M, N, O, P are made of 1100 dtex Polyester, hybrids R, S are made of 1670 dtex Polyester. Nylon components of these cords are 1400 and 1880 dtex.

The static adhesion of polyester-nylon hybrids are at sufficient levels and those having high nylon content generally have better adhesion properties. Cords with 2 ply nylon component have higher breaking strength retention than

that of 2 ply polyester containing hybrids. Nylon is always the component that contributes to overall fatigue performance. Adhesion retention of all hybrids after fatigue testing is in the range of 60-85 %.