Cut resistant polyethylene yarn, method for manufacturing the same, and protective article produced using the same

Patent metadata

Field	Value
Publication number	US-12435448-B2
Application number	US-202017435808-A
Country	US
Kind code	B2
Filing date	Mar 20, 2020
Priority date	Mar 21, 2019
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

The present disclosure relates to a polyethylene yarn that enables the production of protective article capable of providing excellent wearability while having high cut resistance, a method for manufacturing the same, and a protective article produced using the same.

First claim

The invention claimed is:

1. A polyethylene yarn having a weight average molecular weight of 80,000 to 160,000 g/mol, a strength of 11 to 18 g/d, an initial modulus of 150 to 200 g/d, an elongation of 6 to 10%, and a dry heat shrinkage at 100° C. of 3.0 to 3.5%,
wherein a ratio of a storage elastic modulus at 50° C. to a storage elastic modulus at 30° C. of the polyethylene yarn is 65 to 75%,
a ratio of a storage elastic modulus at 80° C. to a storage elastic modulus at 30° C. of the polyethylene yarn is 30 to 45%, and
a ratio of a storage elastic modulus at 105° C. to a storage elastic modulus at 30° C. of the polyethylene yarn is 10 to 25%.

2. The polyethylene yarn according to claim 1 ,
wherein the polyethylene yarn comprises 40 to 500 filaments each having a fineness of 1 to 3 denier, and has a total fineness of 100 to 1,000 denier.

3. A method for manufacturing a polyethylene yarn according to claim 1 comprising the steps of:
melting a polyethylene chip having a weight average molecular weight of 80,000 to 160,000 g/mol and a melt index (MI) (at 190° C.) of 0.3 to 3 g/10 min to obtain a polyethylene melt;
extruding the polyethylene melt through a spinneret with a plurality of nozzle holes;
cooling a plurality of filaments formed when the polyethylene melt is discharged from the nozzle holes;
converging the cooled filaments to form a multifilament yarn;
drawing and heat setting the multifilament yarn at a total draw ratio of 12 to 20 times; and
winding the drawn and heat set multi-filament yarn,
wherein the drawing step is performed in a multi-stage drawing manner, and a relaxation rate at the final drawing during the multi-stage drawing is 5% to 8%.

4. The method for manufacturing a polyethylene yarn according to claim 3 ,
wherein the drawing step is performed using a plurality of godet rollers.

5. The method for manufacturing a polyethylene yarn according to claim 3 ,
wherein the heat setting of the multifilament yarn is performed by a plurality of godet rollers.

6. A protective article knitted with a covered yarn,
the covered yarn comprising:
the polyethylene yarn according to claim 1 ;
a polyurethane yarn spirally surrounding the polyethylene yarn; and
a polyamide or polyester yarn spirally surrounding the polyethylene yarn,
wherein the protective article has a cut resistance index of 5.5 to 8.5 and a stiffness of 2.0 to 5.0 gf.

7. The protective article according to claim 6 ,
wherein the weight of the polyethylene yarn is 45 to 85% of the total weight of the covered yarn,
the weight of the polyurethane yarn is 5 to 30% of the total weight of the covered yarn, and
the weight of the polyamide or polyester yarn is 5 to 30% of the total weight of the covered yarn.

Assignees

• Kolon Inc

Inventors

• Lee Young-Soo
• Lee Sang-Mok
• Kim Seong-Young
• Lee Sin-Ho
• Nam Min-Woo

Classifications

• D10B2501/041

  Gloves · CPC title

• D10B2401/063

  high strength · CPC title

• D10B2321/0211

  high-strength or high-molecular-weight polyethylene, e.g. ultra-high molecular weight polyethylene [UHMWPE] · CPC title

• D04B21/207

  Wearing apparel or garment blanks · CPC title

• D04B21/16

  incorporating synthetic threads · CPC title