High-strength polyethylene yarn having an improved shrinkage rate and method for manufacturing the same
AssigneeKolon Industries, Inc.
InventorsSinho Lee, Young Soo Lee, Seong-Young Kim, Jung Eun Park
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Abstract
Provided are a high-strength polyethylene yarn having an improved shrinkage rate and a method for manufacturing the same. More particularly, a high-strength polyethylene yarn which has a specific microstructure and has an improved shrinkage rate to allow manufacture of high-density fabric, and a method for manufacturing the same are provided.
Claims13
A polyethylene yarn having a ratio (A/B) of a highest intensity peak (A) occurring at a scattering vector of 0 to 0.04 Å−1 to a highest intensity peak (B) occurring at a scattering vector of 0.05 to 0.08 Å−1 in small-angle X-ray scattering (SAXS) of 16 or more and a shrinkage rate of 2.5% or more, and a weight average molecular weight (Mw) of 200,000 to 600,000 g/mol.
A method for manufacturing a polyethylene yarn, the method comprising:
- melting polyethylene chips having a melt index (MI) of 0.3 to 6 g/10 min as measured at 190° C. and 2.16 kg, a molecular weight distribution of more than 5 and less than 9 and a weight average molecular weight (Mw) of 200,000 to 600,000 g/mol to obtain a polyethylene melt;
- spinning the polyethylene melt through a spinneret having a plurality of nozzle holes;
- cooling a plurality of filaments which are formed when the polyethylene melt is discharged from the nozzle holes;
- interlacing the plurality of filaments cooled to form a multifilament yarn;
- drawing and heat-fixing the multifilament yarn at a total drawing ratio of 5 times to 20 times;
- and winding up the drawn and heat-fixed multifilament yarn,
- wherein the polyethylene yarn has a ratio (A/B) of a highest intensity peak (A) occurring at a scattering vector of 0 to 0.04 Å−1 to a highest intensity peak (B) occurring at a scattering vector of 0.05 to 0.08 Å−1 in small-angle X-ray scattering (SAXS) of 16 or more and a shrinkage rate of 2.5% or more.
Dependencies are inferred from the claim text.