Thermomechanical Properties of Nylon 6,6/Polyester Hybrid Tire Cord: Effect of Twist Level and Core Ratio

Document Type : Research Paper

Authors

1 Department of Textile Engineering, Amirkabir University of Technology, P.O. Box 1591634311, Tehran, Iran

2 Razi Tire Cord Co., P.O. Box 1345, Takestan, Iran

Abstract

Hypothesis: Design and production of hybrid tire cords is a simple and cost-effective way to improve the physical and thermal properties of the tire. It also affects the fuel consumption of the vehicle.
Methods: In this study, to achieve new reinforcing materials with better performance using conventional fibers, a hybrid tire cord has been manufactured by twisting nylon 6.6 and polyester yarns together. The effects of twist level and core ratio were studied on the thermomechanical properties of the hybrid cord. The produced cords have different twist levels of 300, 350 and 400 tpm and core ratios of 1.00, 1.03, and 1.05. The mechanical properties of these cords, including strength and creep, have been studied. The heat shrinkage and shrinkage force were also measured and compared with reference samples, nylon and polyester yarns and cords. The dynamic mechanical thermal analysis (DMTA) was used to examine the shrinkage force and creep of the tire cords.
Findings: The results show that the yield strain and shrinkage of all hybrid cords were lower than those of the nylon cord and more than those of the polyester cord. The increase in the twist level leads to a decrease in the load at specific elongation (LASE), and also an increase in the creep due to the helix angle between the cord axis and filament axis. In addition, the LASE, work to rupture and creep increase, as the core ratio increases. Furthermore, a rise in twist level and core ratio leads to an increase in shrinkage and shrinkage force. The hybrid tire cord with a core ratio of 1.05 due to its dimensional stability and good mechanical properties can be used to design high-performance tires.

Keywords

References

  1. Sanjeevan T., Effects of Thermal Contraction on Structure and Properties of PET Fibers, https://www.slideshare.net/ThayaleesparakumarSanjeevan/tyre-technology, Available in 7 May 2019.
  2. Aytac A., Yilmaz B., and Deniz V., Effects of Linear Density and Twist Level on The Mechanical Properties of Nylon 6.6 Tyre Cord, Fiber. Polym., 1, 309-315, 2010.
  3. Ramazani S., Morshed M., and Ghane M., Study of the Effect of Heat Treatment on Nylon 66 Tire Cords Structure and Its Physical Properties, Iran. J. Polym. Sci. Technol. (Persian), 2, 109-117, 2006.
  4. Yilmaz B., Investigation of Twisted Monofilament Cord Properties Made of Nylon 6.6 and Polyester, Fiber Polym., 12, 1091-1098, 2011.
  5. Cho D. and Jeong Y., Study on the Strength Retention of Technical Cord Yarn, Fiber. Polym., 7, 305– 309, 2006.
  6. Anthony R.B., Ramirez J., and Clerc C., Handbook of Properties of Textile and Technical Fibres, 2nd ed., Woodhead, North America, 595-618, 2018.
  7. Vecchiato S., Ahrens J., Pellis A., Scaini D., Mueller B., Acero E.H., and Guebitz G.M., Enzymatic Functionalization of HMLS- Polyethylene Terephthalate Fabrics Improves the Adhesion to Rubber, Sustain. Chem. Eng., 5, 6456-6465, 2017.
  8. Razavizadeh M. and Jamshidi M., Adhesion of Nitrile Rubber (NBR) to Polyethylene Terephthalate (PET) Fabric-Part 1: Surface Modification by Methylenediphenyl Di-isocyanate (MDI), Appl. Surf. Sci., 360, 429-435, 2016.
  9. Mounting Radial Tires on Classic-Vehicle Rims, https://www.sema.org/news/2011/07/01/Mounting-Radial-Tires-on-Classic-Vehicle-Rims, Available in 28 March 2020.
  10. Aytac A., Yilmaz B., and Deniz V., Nylon 66/Polyester Hybrid Cords: 1. Design and Investigation of Properties, Fiber. Polym., 12, 252-257, 2011.
  11. Aytac A., Yilmaz B., and Deniz V., Fatigue Properties of Nylon 66/Polyester Hybrid Cord, RubberChem. Techol., 84, 482-492, 2011.
  12. Tian L.,  Lv P.,  Zhuo J., and Wei Q., Preparation and Characteristics of an Advanced Polyester Tire Cord with Hybrid Effect, J. Eng. Fiber. Fabr., 14,1-7, 2019.
  13. Aytac A., Twaron Drives Tires, https://www.teijinaramid.com/en/applications/tires, Available in 5 November 2019.
  14. Reuter R., Schmitz F., Imhoff S.J., and Donckels Y., Pneumatic Tire Having an Overlay Reinforcement, US Pat.,6799618B2, 2004.
  15. Fritsch J., Rugraff P., and Funderburk J., Hybrid Cabled Cord and a Method to Make It, US Pat., 7051507B2, 2003.
  16. Love N.W., France B.R., Lamontia.M., and Deakyne .C., Unbalanced Hybrid Cords and Methods for Making on Cable Cording Machines, US Pat., 9175425B2, 2015.
  17. Aytac A., Effect of Twist Level on Tyre Cord Performance, Fiber. Polym., 10, 221-225, 2009.
  18. Rath J.P. and Chaki T.K., Effect of Thermal Treatment on Structure and Properties of Polyester Tire Cords, J. Appl. Polym. Sci., 124, 266-274, 2012.
  19. Rezvani A., Karami G., and Yaghoubi M., Thermal Analysis of Tire, Iran. J Esteghlal (Persian), 1, 137-149, 2001.
  20. Chen B., Material Characterization of Tire Cords and the Effects of Cord Thermal-Mechanical Properties on Tires, Tire Sci. Technol., 32, 2-22, 2004.
  21. Keum J.K., Crystallization and Transient Mesophase Structure in Cold-Drawn PET Fibers, Macromolecules, 36, 9873-9878, 2003.
  22. Ghoreishy M., Naderi G., and Zare M., Computer Simulation and Experimental Study of Deformation in a Radial Tire under Different Static Loads Using Finite Element Method, Iran. J. Polym. Sci. Technol. (Persian), 27, 325-336, 2014.
  23. Chakravarty S.N., Developments in Tyre Cords- Some Observations, Indian J. Fiber Text. Res., 22, 259-263, 1997.
  24. Hockenberger A.S., Effect of Twist on Performance of Tire Cord Yarns, Indian J. Fiber Text. Res., 29, 19-24, 2004.

 

Iranian Journal of Polymer Science and Technology
Volume 33, Issue 2 - Serial Number 166
July and August 2020
Pages 115-123

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