JP2000328347A5

JP2000328347A5 -

Info

Publication number: JP2000328347A5
Application number: JP1999130124A
Authority: JP
Filing date: 1999-05-11
Publication date: 2006-06-15
Anticipated expiration: 2019-05-11

Description

【特許請求の範囲】
【請求項１】多数のノズル孔が、複数に区画されたノズル孔密集領域に形成されてなる紡糸口金であって、前記紡糸口金は外形が略長方形をなし、前記ノズル孔密集領域は、前記紡糸口金の長辺方向両端の端部に形成された端部領域と、前記端部領域間に形成された一以上の中央領域とを備え、前記端部領域のノズル孔は、前記紡糸口金の隅部に対応する部位の外縁形状が曲線をなすように配列されてなる、ことを特徴とする紡糸口金。
【請求項２】前記曲線は、曲率半径が５〜３０ｍｍの円弧である請求項１記載の紡糸口金。
【請求項３】前記ノズル孔密集領域間の間隔は１〜５ｍｍである請求項１又は２記載の紡糸口金。
【請求項４】前記ノズル孔密集領域におけるノズル孔の密度は３〜３５個／ｍｍ^２である請求項１〜３のいずれかに記載の紡糸口金。
【請求項５】請求項１〜４のいずれかに記載の紡糸口金を用いて湿式紡糸することを特徴とするアクリル系繊維の紡糸方法。 [Claims]
1. A spinneret in which a large number of nozzle holes are formed in a plurality of nozzle hole dense regions, the spinneret has a substantially rectangular outer shape, and the nozzle hole dense region is the same. It includes an end region formed at both ends of the spinneret in the long side direction and one or more central regions formed between the end regions, and a nozzle hole in the end region is formed of the spinneret. A spinneret characterized in that the outer edge shapes of the parts corresponding to the corners are arranged so as to form a curve.
2. The spinneret according to claim 1, wherein the curve is an arc having a radius of curvature of 5 to 30 mm.
3. The spinneret according to claim 1, wherein the distance between the nozzle hole dense regions is 1 to 5 mm.
4. A spinneret according to any one of claims 1 to 3 density of nozzle holes is from 3 to 35 pieces / mm ² in the nozzle holes dense region.
5. A method for spinning an acrylic fiber, which comprises wet spinning using the spinneret according to any one of claims 1 to 4.

以下、本発明について実施例及び比較例を挙げて詳細に説明する。
「実施例１」
ジメチルアセトアミドを溶剤として、アクリロニトリル９３質量％と酢酸ビニル７質量％との共重合体を２４質量％含む紡糸原液を調製し、凝固液としては４０℃のジメチルアセトアミド５５質量％水溶液を採用した。更に、紡糸口金としては図１に示すタイプのもので、寸法は、Ｗ_１＝８ｍｍ、Ｗ_２＝１０ｍｍ、Ｌ＝４０ｍｍ、Ｒ＝１０ｍｍ、Ｄ＝２ｍｍで、ノズル孔径は６０μｍ、ノズル孔密集領域の数は９ヶ、ノズル孔数は３５０００個のものを採用した。
前記紡糸原液を前記紡糸口金から前記凝固液中に、ノズル孔１個当たりの吐出量を０．０３ｃｃ／分として吐出し凝固させ、得られた糸条を９ｍ／分の速度で引き取った。次いで、その糸条を５倍に延伸しながら十分に水洗を行った後、１５０℃でロール乾燥させてアクリル系繊維を得た。凝固液中に配された紡糸口金の４隅部分におけるノズル孔近傍の観察を行ったところ、糸切れは観察されなかった。また繊維の断面及び表面を観察したところ、互いに接着している繊維もなく良好な繊維が得られた。 Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.
"Example 1"
A spinning stock solution containing 24% by mass of a copolymer of 93% by mass of acrylonitrile and 7% by mass of vinyl acetate was prepared using dimethylacetamide as a solvent, and a 55% by mass aqueous solution of dimethylacetamide at 40 ° C. was adopted as the coagulation solution. Further, the spinneret is of the type shown in FIG. 1, and the dimensions are W ₁ = 8 mm, W ₂ = 10 mm, L = 40 mm, R = 10 mm, D = 2 mm, the nozzle hole diameter is 60 μm, and the nozzle hole dense area. The number of nozzles was 9, and the number of nozzle holes was 35,000.
The undiluted spinning solution was discharged from the spinneret into the coagulating liquid at a discharge rate of 0.03 cc / min per nozzle hole to coagulate, and the obtained yarn was taken up at a speed of 9 m / min. Next, the yarn was thoroughly washed with water while being stretched 5 times, and then rolled-dried at 150 ° C. to obtain an acrylic fiber. When the vicinity of the nozzle holes was observed at the four corners of the spinneret arranged in the coagulating liquid, no yarn breakage was observed. Moreover, when the cross section and the surface of the fibers were observed, good fibers were obtained without fibers adhering to each other.

「実施例２」
ジメチルアセトアミドを溶剤として、アクリロニトリル９６質量％とアクリルアミド３質量％とメタクリル酸１質量％との共重合体を２１質量％含む紡糸原液を調製し、凝固液としては３５℃のジメチルアセトアミド６９質量％水溶液を採用した。更に、紡糸口金としては図１に示すタイプのもので、寸法は、Ｗ_１＝８ｍｍ、Ｗ_２＝１０ｍｍ、Ｌ＝３０ｍｍ、Ｒ＝１５ｍｍ、Ｄ＝２ｍｍで、ノズル孔径は７５μｍ、ノズル孔密集領域の数は１１ヶ、ノズル孔数は１２０００個のものを採用した。
前記紡糸原液を前記紡糸口金から前記凝固液中に、ノズル孔１個当たりの吐出量を０．０４ｃｃ／分として吐出し凝固させ、得られた糸条を７ｍ／分の速度で引き取った。次いで、その糸条を５倍に延伸しながら十分に水洗を行った後、１５０℃でロール乾燥させてアクリル系繊維を得た。凝固液中に配された紡糸口金の４隅部分におけるのノズル孔近傍の観察を行ったところ、糸切れは観察されなかった。また繊維の断面及び表面を観察したところ、互いに接着している繊維もなく良好な繊維が得られた。 "Example 2"
Using dimethylacetamide as a solvent, a spinning stock solution containing 21% by mass of a copolymer of 96% by mass of acrylonitrile, 3% by mass of acrylamide and 1% by mass of methacrylic acid was prepared, and the coagulating solution was a 69% by mass aqueous solution of dimethylacetamide at 35 ° C. It was adopted. Further, the spinneret is of the type shown in FIG. 1, and the dimensions are W ₁ = 8 mm, W ₂ = 10 mm, L = 30 mm, R = 15 mm, D = 2 mm, the nozzle hole diameter is 75 μm, and the nozzle hole dense area. The number of nozzles was 11, and the number of nozzle holes was 12,000.
The undiluted spinning solution was discharged from the spinneret into the coagulating liquid at a discharge rate of 0.04 cc / min per nozzle hole to coagulate, and the obtained yarn was taken up at a speed of 7 m / min. Next, the yarn was thoroughly washed with water while being stretched 5 times, and then rolled-dried at 150 ° C. to obtain an acrylic fiber. When the vicinity of the nozzle hole was observed at the four corners of the spinneret arranged in the coagulating liquid, no yarn breakage was observed. Moreover, when the cross section and the surface of the fibers were observed, good fibers were obtained without fibers adhering to each other.