Polyester Tire Cord With Excellent Dimensional Stability And Method For Manufacturing The Same
AssigneeHyosung Corporation
InventorsSi-Hwan Joo, Hong-Un Kim, Jin-Kyeong Park, Su-Yeon Hwang, Cheol Kim
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Abstract
The present invention relates to a polyester tire cord with excellent dimensional stability which utilizes a yarn manufactured by adjusting spinning and drawing conditions, and a method for manufacturing the same.
Claims4
A polyester tire cord with excellent dimensional stability, in which a polyester yarn undergoes twisting and dipping treatments, given that intermediate elongation (@2.25 g/d) of the tire cord after vulcanization for 20 minutes at 170° C. is E2, intermediate elongation (@2.25 g/d) of the tire cord before vulcanization is E1, and the difference between E2 and E1 is ΔE, comprises:
- ΔE divided by E1 is 0.5 or less.
A manufacturing method of a polyester tire cord which comprises the steps of:
- forming a discharged yarn extruded while a polyester containing 85 mol % or more of ethylene terephthalate units is melted and passed through the nozzle;
- forming an undrawn yarn by spinning the discharged yarn;
- manufacturing a yarn by multistep drawing the undrawn yarn by passing the yarn through a draft roller so that the total draw ratio is 1.60 or less;
- weaving the yarn by cable/ply twisting at 300˜500 twist/meter;
- and
- dipping the woven yarn, which undergoes the weaving step as described above, in a dipping solution of an epoxy and a pexul, and then drying and drawing and heat-setting the woven yarn, before dipping the woven yarn again in resorcinol-formaldehyde latex (RFL) and drying and heat-setting the woven yarn.
Dependencies are inferred from the claim text.