Braid

Patent metadata

Field	Value
Publication number	US-10087560-B2
Application number	US-201314432069-A
Country	US
Kind code	B2
Filing date	Sep 26, 2013
Priority date	Sep 28, 2012
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

It is provided that a braid which has high dimensional stability even in long-term high temperature storage and which fluctuates little in physical properties with the lapse of time. And it is provided that fishing lines, nets, ropes, and protective covers, and bulletproof materials using the same. A braid comprising a polyethylene fiber or polyethylene tape which has an intrinsic viscosity [η] of not less than 5.0 dL/g and not more than 30 dL/g and contains not less than 90% of ethylene as a repeating unit thereof, wherein a thermal shrinkage percentage is not less than 0.45% and not more than 8% under an environment of 80° C. for 240 hours.

First claim

The invention claimed is:

1. A braid comprising a polyethylene fiber or polyethylene tape which has an intrinsic viscosity [η] of not less than 5.0 dL/g and not more than 30 dL/g and contains not less than 90% of ethylene as a repeating unit thereof,
wherein a thermal shrinkage percentage is not less than 0.45% and not more than 8% under an environment of 80° C. for 240 hours,
wherein the braid does not include a core, and
wherein all the polyethylene fibers or all the polyethylene tapes constituting the braid are braided to produce a braid simultaneously.

2. A braid comprising a polyethylene fiber or polyethylene tape which has an intrinsic viscosity [η] of not less than 5.0 dL/g and not more than 30 dL/g and contains not less than 90% of ethylene as a repeating unit thereof, wherein
a tensile strength retention rate is not less than 85% and not more than 115% under an environment of 80° C. for 240 hours, and
wherein the braid does not include a core.

3. The braid according to claim 1 , wherein a stress at the time of 1% elongation is not less than 0.5 cN/dtex and not more than 20 cN/dtex.

4. The braid according to claim 1 , wherein a thermal shrinkage stress at not lower than 30° C. and not higher than 80° C. is not more than 5.0 cN/dtex when measured by a thermo-mechanical analyzer (TMA).

5. The braid according to claim 1 , wherein a loop strength retention rate is not less than 15% when measured in accordance with JIS L-1013.

6. The braid according to claim 1 , wherein the braid is constituted from not less than 3 yarns and at least one yarn constituting the braid is a polyethylene fiber.

7. A braid constituted from at least one polyethylene fiber having an intrinsic viscosity [η] of not less than 5.0 dL/g and not more than 30 dL/g, comprising not less than 90% of ethylene as a repeating unit thereof, and having a storage modulus at not lower than 30° C. and not higher than 80° C. of not less than 70 cN/dtex when measured by a solid viscoelasticity measurement apparatus after the braid is un-braided,
wherein the braid does not include a core.

8. A braid constituted from at least one polyethylene fiber having an intrinsic viscosity [η] of not less than 5.0 dL/g and not more than 30 dL/g, comprising not less than 90% of ethylene as a repeating unit thereof, and having a thermal shrinkage stress at not lower than 30° C. and not higher than 80° C. of not more than 5.0 cN/dtex when measured by a thermo-mechanical analyzer (TMA) after the braid is un-braided,
wherein the braid does not include a core.

9. The braid according to claim 1 , wherein a specific gravity is not less than 0.80 and not more than 2.0 and an average tensile strength is not less than 8 cN/dtex and not more than 50 cN/dtex.

10. The braid according to claim 9 , wherein the braid is colored.

11. The braid according to claim 1 , wherein the braid is drawn at a draw ratio of not less than 1.05 times and not more than 15.0 times at not higher than 160° C. after braid production.

12. A fishing line using the braid according to claim 1 .

13. A rope using the braid according to claim 1 .

14. A method for producing a braid, comprising spinning a polyethylene which has an intrinsic viscosity [η] of not less than 5.0 dL/g and not more than 30 dL/g and contains not less than 90% of ethylene as a repeating unit thereof,
drawing the polyethylene at temperature of not lower than 80° C. to make a drawn filament,
cooling the drawn filament at a cooling speed of not lower than 3° C./sec,
winding up the obtained drawn filament at a tension of 0.001 to 7 cN/dtex to prepare a polyethylene fiber,
twisting the polyethylene fiber if necessary, and
adjusting, in a subsequent braid production step, a time for heating the polyethylene fiber constituting the braid to a temperature of not lower than 70° C. to not longer than 30 minutes and a tension applied to the polyethylene fiber during the heating to not less than 0.005 cN/dtex and not more than 15 cN/dtex.

Assignees

• Toyo Boseki

Inventors

• Fukushima Yasunori
• Hamano Kojiro

Classifications

• D07B2201/2009

  characterised by the materials used · CPC title

• D07B1/025

  comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers · CPC title

• A01K91/00

  Lines · CPC title

• D04C1/02 Primary

  made from particular materials · CPC title

• D07B2201/1096

  braided · CPC title