Process for producing a fibrous bundle via a spinning nozzle

Patent metadata

Field	Value
Publication number	US-9834864-B2
Application number	US-201414768828-A
Country	US
Kind code	B2
Filing date	Feb 26, 2014
Priority date	Feb 26, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A spinning nozzle which has a perforated part in which ejection holes have been arranged in a density as high as 600-1,200 holes/mm 2 . This process for producing a fibrous bundle comprises ejecting a spinning dope having a viscosity as measured at 50° C. of 30-200 P from the ejection holes of the spinning nozzle to produce a fibrous bundle. This fibrous bundle has a single-fiber fineness of 0.005-0.01 dtex. By the wet-process direct spinning, a mass of nanofibers which are stably uniform and continuous can be produced at a high efficiency.

First claim

The invention claimed is:

1. A spinning nozzle comprising a perforated part having a number of ejection holes per square mm of at least 600 holes/mm 2 to no more than 1,200 holes/mm 2 .

2. The spinning nozzle according to claim 1 , wherein one of the ejection holes has an opening area of is at least 100 μm 2 to no more than 350 μm 2 .

3. The spinning nozzle according to claim 1 , wherein the number of the ejection holes is at least 8×10 5 to no more than 25×10 5 holes.

4. The spinning nozzle according to claim 1 , having an inter-outer edge distance between a first ejection hole and a second ejection hole closest to the first ejection hole of at least 10 μm to no more than 20 μm.

5. The spinning nozzle according to claim 1 , wherein all of the ejection holes have a course for which a distance from an outer edge of the ejection holes to a perforated part outer peripheral line of the perforated part is no more than 2 mm.

6. A process for producing a fibrous bundle, comprising:
ejecting a spinning dope from the ejection holes of the spinning nozzle according to claim 1 ; and
obtaining the fibrous bundle,
wherein the fibrous bundle comprising fibers has a single-fiber fineness of at least 0.005 dtex to no more than 0.01 dtex, and a total fineness of at least 4×10 3 dtex to no more than 8×10 5 dtex.

7. The process according to claim 6 , wherein the spinning dope has a viscosity at 50° C. of at least 30 poise to no more than 200 poise.

8. The process according to claim 6 , wherein the spinning dope comprises a polymer dissolved within and the polymer has a specific viscosity of at least 0.18 to no more than 0.27.

9. The process according to claim 6 , wherein the fibrous bundle comprises acrylic fibers.

10. The process according to claim 6 , further comprising:
providing an oil solution treatment liquid having a concentration of oil solution of 3 to 10% to the fibrous bundle, and
drying the fibrous bundle while the oil solution treatment liquid adheres thereto.

Assignees

• Mitsubishi Chem Corp

Inventors

• Kotera Yoshinobu
• Onohara Yukio
• NAKANISHI Shima

Classifications

• D01F6/18

  from polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide · CPC title

• D01D5/06 Primary

  Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title

• D21H13/18

  Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylonitriles · CPC title

• D01D4/02 Primary

  Spinnerettes (alloys therefor C22C) · CPC title

• D04H1/43

  Acrylonitrile series · CPC title