JP2004323991A - Conjugate fiber for woven fabric and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polytrimethylene terephthalate-based conjugate fiber which can develop an excellent quality, soft hand and stretch characteristics without causing band-like unevenness and a stripe-like defect, when used as a warp and/or a weft for a thin woven fabric having a small cover factor, and to provide a method for producing the same. <P>SOLUTION: This polytrimethylene terephthalate-based conjugate fiber is characterized by comprising a group of single filaments in whose each filament two polyester components are bonded to each other in a side-by-side type or in an eccentric sheath-core type, using polytrimethylene terephthalate as at least one of the components constituting the single filaments, and satisfying the following requirements (1) to (3). (1) The maximum cross section area/minimum cross section area ratio of the constituting single filament is ≤2.0. (2) A fineness variation U% measured by a normal method is ≤1.2%. (3) In a fineness variation U% chart measured by an inert method, the mountain-valley difference in a wave continued in a fiber length direction is ≤8% based on an average dtex (the fineness variation U% is measured over a fiber length of 2,000 m). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００３６】
・繊度変動値Ｕ％
変動チャート及び表示される変動値を直読した。
・Ｕ％波形高低差
測定法をイナートにし、糸長２０００ｍとする以外は（２）と同条件で測定し、チャートを取る。その後、糸長方向に連続した山と谷の高低差で最大のものを読み取る。
・繊度変動周波数解析
イヴネステスターに付属の繊度変動周波数解析ソフトを用い上記条件で２０００ｍ測定し、周期とＣＶ値を読む。
【００３７】
（３）冷風速度時間変動
冷風吹き出し板の中央部を風速計クリモマスター６５４３（日本カノマックス製）で５分間測定し、チャートを書かせる。この間の風速最大値と最小値を読み、その差を冷風速度時間変動とする。
（４）乾熱収縮応力値
熱応力測定装置（カネボウエンジニアリング社製、商品名ＫＥ−２）を用いて測定した。
【００３８】
繊維を約２０ｃｍ長の長さに切り取り、これの両端を結んで輪をつくり測定器に装填する。初荷重０．０５ｃＮ／ｄｔｅｘ、昇温速度１００℃／分の条件で測定し、熱応力の温度変化をチャートに書く。熱収縮応力は、高温域で山型の曲線を描く。このピーク値の読み取り値（ｃＮ）から、下記式で求められる値を乾熱収縮応力値とした。
乾熱収縮応力値（ｃＮ／ｄｔｅｘ）＝（ピーク値の読み取り値 ｃＮ）／（ｄｔｅｘ×２）−初荷重（ｃＮ／ｄｔｅｘ）
【００３９】
（５）負荷時の伸縮伸長率（ＣＥ_３．５ ）
糸を周長１．１２５ｍの検尺機で１０回かせ取りし、３．５×１０^−３ｃＮ／ｄｔｅｘの荷重を掛けた状態で、沸騰水中で３０分間熱処理する。ついで、同荷重を掛けたまま乾熱１８０℃で１５分間乾熱処理する。処理後、ＪＩＳ−Ｌ−１０１３に定められた恒温恒湿室に一昼夜静置した。次いで、かせに以下に示す荷重を掛けてかせ長を測定し、以下の式から伸縮伸長率を測定する。
負荷時の伸縮伸長率（ＣＥ_３．５ ）％＝（Ｌ２−Ｌ１）／Ｌ１×１００
但し、Ｌ１＝１×１０^−３ｃＮ／ｄｔｅｘ荷重付加時のかせ長
Ｌ２＝０．１８ｃＮ／ｄｔｅｘ荷重付加時のかせ長
【００４０】
（６）捲縮の形態
糸を周長１．１２５ｍの検尺機で１０回かせ取りし、無荷重で沸騰水中で３０分間熱処理する。ついで風乾した後、マイクロスコープを用い倍率１５０倍で捲縮の形態を観察する。
（７）紡糸安定性
１錘当たり８エンドの紡口を装着した溶融紡糸―連続延伸機を用いて、各実施例ごとに２日間の溶融紡糸―連続延伸を行った。この期間中の糸切れの発生回数と、得られた複合繊維パッケージに存在する毛羽の発生頻度（毛羽発生パッケージの数の比率）から、以下のように判定した。
◎ ； 糸切れ０回、毛羽発生パッケージ比率 ５％以下
○ ； 糸切れ２回以内、毛羽発生パッケージ比率 １０％未満
× ； 糸切れ３回以上、毛羽発生パッケージ比率 １０％以上
【００４１】
（８）織物の緯斑評価
織物の作成は以下のように行った。
経糸に５６ｄｔｅｘ／２４ｆのＰＴＴ単一の繊維（旭化成「ソロ」）の無撚糊付け糸を用い、緯糸に本発明の各実施例および比較例の５６ｄｔｅｘ／２４ｆ複合繊維を用いて平織物を作成した。

得られた生機を、オープンソーパーにて９５℃で連続精練後、１２０℃でシリンダー乾燥した後、液流染色機にて１２０℃で染色を行った。次いで、１７５℃で仕上、幅だし熱セットの一連の処理を行った。得られた織物を、熟練した検査技術者が検査し、緯の染め品位を以下のように判定した。
◎ ；楊柳調シワやヒケ、斑などの欠点なく、極めて良好
○ ；楊柳調シワやヒケ、斑などの欠点なく、良好
× ；楊柳調シワやヒケ、斑のいずれかの欠点があり、不良
【００４２】
【実施例１〜４、比較例１〜３】
本実施例では、紡口面から冷却開始までの保温領域の長さ及び冷風速度の時間変動の効果について説明する。
一方の成分として、酸化チタンを０．４重量％含む極限粘度１．３のＰＴＴと、他方の成分として酸化チタンを０．４重量％含む極限粘度０．９のＰＴＴペレットを図１のような紡糸機及び３対のゴデットロールを有する巻取機を用いて、５６ｄｔｅｘ／２４フィラメントＰＴＴ複合繊維パッケージを製造した。
【００４３】
本実施例における紡糸条件は、以下の如くである。

【００４４】

紡糸時の非送風領域長、冷風経時変動、得られた繊維の物性、評価などを表１に示す。表１から明らかなように、保温領域の長さ、冷風速の時間変動が本発明の範囲であれば、得られる繊維は本発明の要件を満たし、それを緯糸に用いた織物は良好な品位を有す。
【００４５】
【表１】

【００４６】
【実施例５〜６、比較例４〜５】
本実施例では、ＰＴＴ系複合繊維の吐出線速度と繊維のＵ％の効果について説明する。
紡口孔径を変えた以外は実施例１と同じ条件で複合繊維を巻取った。
得られた複合繊維及び織物の物性を、表２に示す。
表２から明らかなように、吐出線速度が本発明の範囲であれば、良好なＵ％及び織物品位を示す。
【００４７】
【表２】

【００４８】
【実施例７〜９、比較例６〜７】
本実施例においては、ポリマー固有粘度差の効果について説明する。
ポリマーの種類及び極限粘度を変更しした以外は実施例１と同じ条件で複合繊維を巻き取った。
得られた複合繊維及び織物の物性を、表３に示す。
表３から明らかなように、ポリマー固有粘度差が本発明の範囲であれば、良好な紡糸性と織物ストレッチ性能を有する。
【００４９】
【表３】

【００５０】
【実施例１０〜１１、比較例８〜９】
本実施例においては、単糸断面形状の効果について説明する。
紡口形状を変更した以外は実施例１と同じれ条件で複合繊維を巻き取った。
得られた複合繊維及び織物の物性を、表４に示す。
表４から明らかなように、単糸断面形状が本発明の範囲である実施例１０〜１１は良好な織物品位を示すが、２種の孔径を混在させた紡口で紡糸した断面積比が２より大きい比較例８と２つの円を接合した紡口孔形状で紡糸した偏平度が１．２より大きい比較例９は織物品位が悪いものとなった。
【００５１】
【表４】

【００５２】
【実施例１２、比較例１０〜１１】
本実施例においては、紡糸口金から集束位置までの距離の効果について説明する。
集束位置までの距離を変更した以外は実施例１と同じ条件で複合繊維を巻き取った。
得られた複合繊維及び織物の物性を表５に示す。
表５から明らかなように、集束位置の距離が本発明の範囲である実施例１２は良好な紡糸性を示すが、本発明の範囲外である比較例１０〜１１は糸切れが多く、またＵ％も悪い値を示した。
【００５３】
【表５】

【００５４】
【発明の効果】
本発明によれば、良好な表面品位と適度なストレッチ性を有する裏地織物に最適なＰＴＴ系複合繊維及びその製造方法を提供することができる。
【図面の簡単な説明】
【図１】イナート法で測定したＵ％チャートの一例を示す。（本発明範囲外の悪い例）
【図２】イナート法で測定したＵ％チャートの一例を示す。（本発明の例）
【図３】イヴネステスターで周波数解析を行なったチャートの一例を示す。
【図４】本発明の複合繊維を紡糸する際に使用する吐出孔の一例を示す概略図である。
【図５】本発明の複合繊維を製造する紡糸―延伸設備の一例を示す概略図である。
【符号の説明】
１：ポリマーチップ乾燥機
２：押出機
３：ポリマーチップ乾燥機
４：押出機
５：ベンド
６：ベンド
７：スピンヘッド
８：スピンパック
９：紡糸口金
１０：マルチフィラメント
１１：保温領域
１２：冷却風
１３：仕上げ剤付与装置
１４：第１ゴデットロール
１５：第２ゴデットロール
１６：第３ゴデットロール
１７：複合繊維パッケージ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a polytrimethylene terephthalate-based composite fiber suitable for textile use and a method for producing the same. More specifically, when used for warp and / or weft of thin woven fabrics having a small cover factor, polytriles exhibiting excellent quality and soft texture and stretch characteristics without causing band-like spots and streak-like defects. The present invention relates to a methylene terephthalate-based composite fiber and a method for industrially stably producing the same.
[0002]
[Prior art]
In recent years, among knitted fabrics, stretch knitted fabrics having a stretch property have been strongly demanded from the viewpoint of wearing.
In order to satisfy such a demand, for example, a large number of knitted fabrics provided with stretchability by mixing polyurethane fibers are used.
However, polyurethane fibers have problems such that the dyeing process is complicated because they are not easily dyed by polyester dyes, and the fibers are embrittled when used for a long period of time, resulting in reduced performance.
For the purpose of avoiding such drawbacks, application of crimped yarn of polyester fiber instead of polyurethane fiber has been studied.
In recent years, PTT-based crimped yarns have been proposed, focusing on the elongation and recovery of polytrimethylene terephthalate (hereinafter, referred to as PTT).
In particular, many latently crimped fibers have been proposed in which two types of polymers are bonded side-by-side or eccentrically to develop crimp after heat treatment.
[0003]
Patent Documents 1 and 2 disclose side-by-side type bicomponent composite fibers using PTT for at least one component or PTT having different intrinsic viscosities for both components, and eccentric sheath-core composite fiber (Hereinafter, both are referred to as PTT-based composite fibers). This PTT-based conjugate fiber is characterized by having a soft feel and good crimp development characteristics. These prior arts describe that they have stretchability and elongation recovery properties, and can be applied to various stretch knitted fabrics or bulky knitted fabrics by utilizing these characteristics.
In particular, Patent Document 2 discloses a PTT-based conjugate fiber that has a high crimp even before the boiling water treatment and is excellent in bulkiness. However, the conjugate fiber disclosed in the publication is a thin fabric such as taffeta. When used for fabrics, the bulkiness is excessive and the woven fabric exhibits a feeling of ground thickness, which limits the development to fields where flatness and lightness are required, such as women's clothing lining with a cover factor of about 2000 or less. there were.
[0004]
On the other hand, Patent Literature 3 discloses that a beautiful cloth surface is obtained by setting the Wester spots of the PTT-based composite fiber to 2.0% or less. However, even if the worcester spot is simply 2.0% or less, a band-like dye spot may occur on the thin fabric. It is clear from the study of the present inventors that the measurement of worcester spots does not match the dyeing quality of the thin woven fabric simply by measuring the spots for the yarn length of 50 to 100 m in the normal mode as disclosed in the patent document. Became. That is, in the PTT-based conjugate fiber, irregular fineness variation may occur in the yarn length direction in order to join two components having different melt viscosities, and further improvement has been demanded.
It became clear that such irregular fluctuation in fineness in the yarn length direction cannot be found without measuring Wooster spots in the inert mode over at least the yarn length of about 2000 m.
[0005]
Further, Patent Document 4 discloses a PTT-based composite fiber having a flat cross section such as a snowman type or an elliptical type. However, in the cross section of a snowman type or an elliptical type as disclosed in the patent document, the joining surface tends to be non-uniform in the yarn length direction, and as a result, the cross-sectional areas of the single yarns constituting the composite fiber become uneven. It became clear that due to such non-uniformity, the fineness variation value U% exceeded 1.2%, the fineness fluctuated in the yarn length direction, and a band-like defect occurred.
Accordingly, the emergence of PTT-based composite fibers that can be used in thin fabrics without band-like spots or streak-like defects, have good surface flatness and surface quality, and exhibit moderate stretchability. It was strongly sought.
[0006]
[Patent Document 1]
Japanese Patent Publication No. 43-0119108
[Patent Document 2]
JP-A-2002-061031
[Patent Document 3]
JP 2001-055634 A
[Patent Document 4]
JP-A-2002-180332
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a PTT-based conjugate fiber having good stretchability, which has no surface quality defect due to occurrence of band-like spots and streak-like defects when weaving a thin woven fabric having a small cover factor using the same. To provide fibers.
It is still another object of the present invention to provide a PTT-based conjugate fiber which has good surface flatness and surface quality with a thin woven fabric and can exhibit appropriate stretchability, and a method for producing the same.
[0008]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, in the production of PTT-based conjugate fibers, by specifying polymer discharge conditions and cooling conditions, the fineness variation value U% has been dramatically improved. This led to the completion of the present invention.
That is, the present invention is as follows.
1. A single yarn group in which two polyester components are bonded to a side-by-side type or an eccentric sheath-core type, and at least one component constituting the single yarn is polytrimethylene terephthalate; A polytrimethylene terephthalate-based composite fiber, which satisfies the requirements of (3).
(1) The cross-sectional area ratio of the constituent single yarns is 2.0 or less at maximum and minimum
(2) The fineness variation U% measured by the normal method is 1.2% or less
(3) In the fineness variation value U% chart measured by the inert method, the difference between the peak and the valley of the continuous waveform in the yarn length direction is 8% or less with respect to the average decitex.
(However, measurement of fineness variation value U% is measured over a yarn length of 2000 m.)
[0009]
2. A CV value in a cycle of 30 to 80 m by a fineness variation frequency analysis is 0.5% or less. The polytrimethylene terephthalate-based composite fiber according to item 1.
3. The dry heat shrinkage stress value is 0.05 to 0.24 cN / dtex. Or 2. The polytrimethylene terephthalate-based composite fiber according to item 1.
4. The cross-sectional shape of the single yarn is substantially circular with a flatness of less than 1.2. ~ 3. The polytrimethylene terephthalate-based composite fiber according to any one of the above.
5. The composite fiber before the boiling water treatment has a spiral crimp. ~ 4. The polytrimethylene terephthalate-based composite fiber according to any one of the above.
6. Both components constituting the single yarn are polytrimethylene terephthalate. ~ 5. The polytrimethylene terephthalate-based composite fiber according to any one of the above.
[0010]
7. Manufacture a composite fiber comprising a single yarn group in which two polyester components are bonded in a side-by-side type or an eccentric sheath-core type, and at least one component constituting the single yarn is polytrimethylene terephthalate. A method for producing a polytrimethylene terephthalate-based composite fiber, characterized by satisfying the following requirements (A) to (D).
(A) the difference in intrinsic viscosity between the two polyester components is from 0.1 to 0.9,
(B) discharging at a polymer discharge linear velocity per discharge hole of 4 to 9 m / min,
(C) The heat insulation area from the spinning surface to the start of cooling is set to 50 to 150 mm,
(D) The time change of the cooling air is set within 0.05 m / sec,
(E) The distance from the spinneret to the focusing position is 50 to 200 cm.
8. 6. A direct spin drawing method in which the cooled and solidified fiber is continuously drawn without being wound once. 3. The method for producing a polytrimethylene terephthalate-based composite fiber according to item 1.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
In the present invention, two polyester components are side-by-side type, or a composite fiber composed of a single yarn group bonded to an eccentric sheath-core type, at least one component constituting the single yarn is PTT, The target is a PTT-based composite fiber in which the other component is made of another polyester.
That is, a combination of PTT and another polyester or a combination of PTTs is targeted.
At least one of the single yarns constituting the PTT-based composite fiber in the present invention is a PTT homopolymer or a copolymerized polytrimethylene terephthalate containing 10 mol% or less of other ester repeating units.
[0012]
Representative examples of the copolymer component include the following.
Examples of the acidic component include aromatic dicarboxylic acids such as isophthalic acid and 5-sodium sulfoisophthalic acid, and aliphatic dicarboxylic acids such as adipic acid and itaconic acid. Examples of the glycol component include ethylene glycol, butylene glycol, polyethylene glycol and the like. Also, hydroxycarboxylic acids such as hydroxybenzoic acid are included in the examples. A plurality of these may be copolymerized.
Other polyester components of the single yarn constituting the PTT-based composite fiber include, in addition to PTT, polyethylene terephthalate (hereinafter, referred to as PET), polybutylene terephthalate (hereinafter, referred to as PBT), or copolymerized with the third component. Used.
[0013]
Representative examples of the copolymer component include the following.
Examples of the third component include aromatic dicarboxylic acids typified by isophthalic acid and 5-sodium sulfoisophthalic acid, and aliphatic dicarboxylic acids typified by adipic acid and itaconic acid. Examples of the glycol component include ethylene glycol, butylene glycol, polyethylene glycol and the like. Also, hydroxycarboxylic acids such as hydroxybenzoic acid are included in the examples. A plurality of these may be copolymerized.
The method for producing the PTT polymer used in the present invention may be a known method. A one-step method in which the degree of polymerization is equivalent to a predetermined intrinsic viscosity only by melt polymerization, or a degree of polymerization is increased by melt polymerization until a certain intrinsic viscosity is reached, and then to a degree of polymerization equivalent to the predetermined intrinsic viscosity by solid phase polymerization. And a two-step method. The latter two-stage method combining solid-state polymerization is preferable for the purpose of reducing the content of the cyclic dimer.
When the degree of polymerization is adjusted to a predetermined intrinsic viscosity by a one-step method, it is desirable to reduce the amount of cyclic dimer by an extraction treatment or the like before supplying to the spinning.
[0014]
The PTT polymer used in the present invention preferably has a trimethylene terephthalate cyclic dimer content of 2.5% by weight or less. More preferably, the content of trimethylene terephthalate cyclic dimer is less than 1.1% by weight. A more preferred trimethylene terephthalate cyclic dimer content is 1.0% by weight or less.
In the present invention, it is preferable that both components constituting the single yarn are PTT. When both components are PTT, excellent stretch-back properties can be exhibited. When both components are PTT, it is necessary to use those having a trimethylene terephthalate cyclic dimer content of 1.1% by weight or less for the purpose of reducing the cyclic dimer content in the conjugate fiber. desirable.
[0015]
The average intrinsic viscosity of the PTT-based composite fiber in the present invention is preferably in the range of 0.7 to 1.2 dl / g. When the average intrinsic viscosity is less than 0.7 dl / g, the strength of the obtained conjugate fiber is low, and the mechanical strength of the fabric is reduced. If the average intrinsic viscosity exceeds 1.2 dl / g, thread breakage occurs during the production of the conjugate fiber, and stable production becomes difficult. Preferred average intrinsic viscosities are in the range of 0.8 to 1.2 dl / g. It is further preferable that the difference between the intrinsic viscosities of both components at that time is 0.1 to 0.9 dl / g, and the average intrinsic viscosity is in the range of 0.8 to 1.2 dl / g.
[0016]
In the present invention, the mixing ratio of the two polyester components in the cross section of a single yarn is preferably such that the ratio of the high-viscosity component to the low-viscosity component is 40/60 to 70/30. When the ratio of the high viscosity component is less than 40%, the yarn strength becomes less than 2 cN / dtex, and the tear strength of the fabric becomes insufficient. On the other hand, when the ratio of the high-viscosity component is more than 70%, the crimping performance decreases. A more desirable compounding ratio is 45/55 to 65/35.
In the present invention, the cross-sectional area ratio of the single yarn constituting the conjugate fiber needs to be 2.0 or less at the maximum and minimum. When the cross-sectional area ratio is larger than 2.0, the crimp variation in the yarn length direction becomes large, and the surface quality of the fabric decreases. The preferred cross-sectional area ratio is 1.5 or less.
[0017]
In the present invention, the fineness variation value U% measured by the normal method needs to be 1.2% or less. If the fineness variation value U% exceeds 1.2%, when fabric is used, spots on the surface are conspicuous and cause quality defects.
In the present invention, in the fineness variation value U% chart measured by the inert method, it is necessary that the difference between the decitex of the peak and the valley of the continuous waveform in the yarn length direction is 8% or less. If the difference between the decitex of the peak and the valley continuous in the yarn length direction is larger than 8%, when the fabric is made, the portion becomes band-like spots, resulting in a quality defect.
Further, it is preferable that the CV value in the period of 30 to 80 m by the fineness variation frequency analysis is 0.5% or less. If the CV value is larger than 0.5%, band-like spots may be formed when the fabric is used.
[0018]
FIG. 1 shows a chart according to the prior art in which the fineness varies in the yarn length direction measured in the inert mode. FIG. 2 shows a chart of the present invention in which the fineness fluctuation has been eliminated by the same measurement. As shown in FIG. 2, for the first time, a PTT-based composite fiber in which fineness fluctuation measured in an inert mode over a long yarn length is eliminated does not cause band-like spots on a thin woven fabric, and the quality of the woven fabric is reduced. Can be good.
In the present invention, the dry heat shrinkage stress value is preferably 0.05 to 0.24 cN / dtex. When the dry heat shrinkage stress value exceeds 0.24 cN / dtex, the wound PTT-based composite fiber shrinks with time to cause tightness, which causes fluctuations in unwinding tension, and causes crimping and puckering on the woven fabric. May occur and the quality may be degraded. If the dry heat shrinkage stress value is less than 0.05 cN / dtex, stable winding becomes difficult during the production of the PTT-based conjugate fiber. A more preferred dry heat shrinkage stress value is 0.05 to 0.20 cN / dtex.
[0019]
In the present invention, the cross-sectional shape of the single yarn is preferably less than 1.2 in flatness. When the cross-sectional shape of the single yarn is 1.2 or more, when the fabric is made into a woven fabric, the quality such as the surface smoothness and gloss may be reduced.
In the present invention, the conjugate fiber before the boiling water treatment preferably has a spiral crimp. If the conjugate fiber before boiling water treatment is a random crimp without spiral crimp, when it is made into a woven fabric, the surface becomes less smooth and becomes thicker, and when it is made into a thin fabric, It tends to be of poor quality.
The preferred dry heat shrinkage stress value is 0.05 to 0.20 cN / dtex, more preferably 0.05 to 0.15 cN / dtex.
[0020]
The PTT-based composite fiber of the present invention is 3.5 × 10^-3Stretch elongation (CE) measured after applying a load of cN / dtex and performing boiling water treatment_3.5) Is preferably 2 to 15%. Stretch rate (CE_3.5If the content exceeds 15%, wool-like wrinkles are generated on the woven fabric surface, which impairs the commercial value. Stretch rate (CE_3.5) Is less than 5%, the stretch ratio of the lining fabric becomes small. Preferred stretch ratio (CE_3.5) Is 7-13%.
The PTT-based composite fiber of the present invention preferably has an elongation at break of 30 to 45%. If the elongation at break is less than 30%, stretching breakage occurs, and industrially stable production becomes difficult. When the breaking elongation exceeds 45%, the breaking strength becomes about 2 cN / dtex or less, and the tear strength of the lining fabric decreases. Further preferred elongation at break is 36 to 45%.
[0021]
The fineness and single yarn fineness of the PTT-based composite fiber of the present invention are not particularly limited, but the fineness is 20 to 300 dtex and the single yarn fineness is 0.5 to 20 dtex.
Further, the cross-sectional shape of the single yarn is not particularly limited, and may be a round, Y, W-shaped irregular cross-section, a hollow cross-sectional shape, or the like.
The PTT-based composite fiber of the present invention includes a matting agent such as titanium oxide, a heat stabilizer, an antioxidant, an antistatic agent, an ultraviolet absorber, an antibacterial agent, various pigments, and the like as long as the effects of the present invention are not impaired. May be contained or contained as a copolymerization component.
[0022]
Hereinafter, the manufacturing method according to the second invention of the present invention will be described.
In the production method of the present invention, it is necessary that the difference in intrinsic viscosity between the two polyester components is from 0.1 to 0.9 dl / g and the melt spinning is performed.
If the intrinsic viscosity difference is smaller than 0.1, sufficient stretchability and recoverability cannot be obtained in the case of fabric. On the other hand, if the intrinsic viscosity difference exceeds 0.9 dl / g, even if the spinning design and the discharge conditions are changed, yarn bending and hole contamination at the time of discharge will not be sufficiently eliminated, and the fineness fluctuation of the PTT-based composite fiber will be reduced. It is not preferable because it becomes large. A preferred intrinsic viscosity difference is 0.2 to 0.6 dl / g. When both components are PTT, the difference in intrinsic viscosity is preferably 0.1 to 0.4.
[0023]
In the manufacturing method of the present invention, it is necessary that the heat retaining area from the spinning surface to the start of cooling is 50 to 150 mm.
If the heat retaining region is shorter than 50 mm, U% becomes larger than 1.2%, and the breaking strength decreases. When the heat retaining region is longer than 150 mm, the height difference of the U% waveform becomes larger than 8%. The preferred length of the heat retaining area is 70 to 130 mm.
In the production method of the present invention, the spinning discharge linear velocity needs to be 4 to 9 m / min. When the linear velocity is less than 4 m / min, the waveform of U% increases, and the difference between the peaks and valleys of the continuous waveform exceeds 8%. On the other hand, if the linear velocity exceeds 9 m / min, the yarn bending becomes large and the area around the spinning hole becomes dirty, so that stable spinning cannot be performed. A preferable discharge linear velocity range is 4 to 8 m / min.
[0024]
In the manufacturing method of the present invention, it is necessary that the time change of the cooling air velocity is 0.05 m / sec or less. If the time change of the wind speed exceeds 0.05 m / sec, U% becomes worse, and U% becomes larger than 1.2%, or the difference between the peaks and valleys of the continuous waveform becomes larger than 8%.
In the manufacturing method of the present invention, it is necessary to set the convergence position of the yarn discharged from the spinneret to 50 to 200 cm from the spinning surface. If the convergence position is less than 50 cm, the solidification of the yarn is insufficient, so that fusion or yarn breakage occurs. On the other hand, if it exceeds 200 cm, the yarn sway becomes severe, and U% failure and yarn breakage occur. The preferred focusing position is 80 to 160 cm from the spinning surface.
[0025]
The discharge hole of the spinneret used in the production of the present invention preferably has an inclination of 20 to 60 degrees with respect to the vertical direction. The inclination angle of the discharge hole with respect to the vertical direction indicates θ (degree) in FIG. The fact that the holes are inclined with respect to the vertical direction is an important requirement for eliminating yarn bending caused by a difference in melt viscosity when discharging two types of polyesters having different compositions or intrinsic viscosities. When the ejection holes do not have a slope, for example, as the difference in intrinsic viscosity increases with the combination of PTTs, the filament immediately after ejection bends in the direction of higher intrinsic viscosity, so-called bending phenomenon occurs, and stable spinning is performed. Becomes difficult.
[0026]
In FIG. 4, it is preferable that a PTT polymer having a high intrinsic viscosity be supplied to the A side and another polyester or PTT polymer having a low intrinsic viscosity be supplied to the B side and discharged. For example, when the intrinsic viscosity difference between PTT polymers is about 0.2 or more, it is preferable that the ejection holes be inclined at least 20 degrees with respect to the vertical direction in order to eliminate bending and realize stable spinning. . When increasing the intrinsic viscosity difference, it is preferable to further increase the inclination angle. However, if the angle of inclination exceeds 60 degrees, the ejection portion becomes elliptical, and stable spinning becomes difficult. In addition, there is a difficulty in manufacturing the hole itself. A more preferable inclination angle is 30 to 50 degrees.
In the production method of the present invention, spinning, after cooling, the undrawn yarn is once wound, and the two-stage spinning method in which the drawing is performed in a separate step, or the continuous spinning method in which the drawing is continuously performed. In the two-stage method, the continuous spinning and stretching method is preferable because unevenness may occur on the end face of the undrawn yarn package due to a change with time.
[0027]
In the production method of the present invention, when the continuous spinning and drawing method is used, it is preferable to wind at a winding speed of 4000 m / min or less. If the winding speed exceeds 4000 m / min, the package after winding contracts with time, and periodic unevenness due to the end of the package may occur, which may degrade the quality of the fabric. A more preferred winding speed is 2500-3800 m / min.
In the production method of the present invention, it is preferable that spinning is performed at a spinning speed of 1000 to 3000 m / min, and after the drawing, heat treatment is performed. If the spinning speed is less than 1000 m / min, the dye quality of the woven fabric may be reduced. If the spinning speed exceeds 3000 m / min, the breaking strength of the PTT-based conjugate fiber after drawing becomes about 2 cN / dtex or less, which may restrict development in fields where strength is required. A more preferred spinning speed is 1600 to 2500 m / min.
[0028]
FIG. 5 is a schematic diagram of a composite spinning facility used in the production method of the present invention.
First, PTT pellets obtained by drying one of the components in the dryer 1 to a moisture content of 20 ppm or less are supplied to the extruder 2 set to a temperature of 250 to 280 ° C. and melted. The other component is similarly melted by the dryer 3 and the extruder 4.
The molten PTT is then sent to the spin head 7 set at 250 to 285 ° C. via bends 5 and 6 and separately metered by a gear pump. Thereafter, the two types of components are joined by a spinneret 9 having a plurality of holes attached to the spin pack 8 and bonded side-by-side, and then extruded as a multifilament 10 into a spinning chamber.
The optimum temperature of the extruder and the spin head is selected from the above range according to the limiting viscosity and the shape of the PTT pellet.
[0029]
The PTT multifilament 10 extruded into the spinning chamber passes through a heat retaining area 11, is cooled and solidified to room temperature by a cooling air 12, passes through a finishing agent nozzle also serving as a bundle, and then rotates at a predetermined speed. After being taken up by the godet roll 14 and not being wound up once, and then continuously stretched with a second godet roll (in this drawing, a heated godet roll) 15, it is stretched and heat-treated by a third godet roll 16, and then taken up. It is wound up as a composite fiber package 17 having a predetermined fineness by a machine.
Before the solidified multifilament 10 comes into contact with the take-off godet roll 14, a finishing agent is applied by the finishing agent applying device 13. A water-based emulsion type is used as the finishing agent to be applied.
The concentration of the aqueous emulsion of the finishing agent is 10% by weight or more, preferably 15 to 30% by weight.
Two or more godet rolls are used. For example, in FIG. 5, a pair of pretension rolls may be provided before the take-off godet rolls.
[0030]
Between two pairs of godet rolls, stretching is performed 1.2 to 3 times by changing the peripheral speed of the godet rolls.
In stretching, the temperature of the first godet roll is 50 to 90 ° C, preferably 55 to 70 ° C. The drawn yarn is subjected to necessary heat treatment by a second godet roll. The temperature of the heat treatment is 80 to 160 ° C, preferably 100 to 140 ° C. Heat treatment is performed in a tension state between the second godet roll and the third godet roll. The third godet roll may be a heated godet roll or may be non-heated. The third godet roll is preferably a non-heated godet roll in order to maintain the running stability of the PTT conjugate fiber by setting the dry heat shrinkage stress value of the PTT conjugate fiber to 0.05 to 0.24 cN / dtex.
[0031]
In the present invention, the stretching tension is preferably set to 0.3 to 0.5 cN / dtex. The stretching tension is the tension between the take-off godet roll 14 and the stretching godet roll 15 (same as the heated godet roll in FIG. 5). If the stretching tension is less than 0.3 cN / dtex, the strength of the PTT-based composite fiber will be less than about 2 cN / dtex, and the mechanical strength will be insufficient. If the stretching tension exceeds 0.5 cN / dtex, the elongation at break is less than 30%, making stable spinning difficult. Preferred stretching tension is 0.3 to 0.4 cN / dtex. The stretching tension can be determined by selecting the peripheral speed ratio between the take-off godet roll and the stretch godet roll, that is, the stretching ratio and the temperature of the take-off godet roll.
[0032]
The woven fabric using the PTT-based composite fiber of the present invention is suitable for lining applications. For example, when used as a lining for women's clothing or men's clothing, there is no feeling of pressure when flexing, and an excellent feeling of wearing clothes can be obtained. Further, even if an elongation stress is applied to the garment, excellent durability can be obtained without slippage of a seam or the like.
When the PTT-based composite fiber of the present invention is used for a woven fabric, it may be untwisted or may be entangled or twisted for the purpose of enhancing convergence. When twist is applied, twist is applied in the same direction as the false twist direction or in a different direction. In this case, the twist coefficient is preferably set to 5000 or less.
The twist coefficient is represented by the following equation.
Twist coefficient k = number of twists T (times / m) × (fineness of false twisted yarn; dtex)^1/2
[0033]
The PTT-based composite fiber of the present invention may be used alone, or the effects of the present invention can be exhibited even when used in combination with other fibers. The composite may be used as a long fiber or as a short fiber. As other fibers to be composited, for example, synthetic fibers such as other polyester fibers and nylon, acrylic, cupra, rayon, acetate, polyurethane elastic fibers, and natural fibers such as cotton, hemp, silk, and wool are selected. It is not limited to. The composite may be a long fiber or a short fiber.
Alternatively, in order to form a woven fabric in which a composite fiber and another fiber are mixed and mixed, a mixed fiber composite yarn is obtained by interlacing another fiber, or drawing false twist after interlace mixing, and then false twisting only one of the fibers and then interlacing. It can be produced by various blending methods such as blending, interlace blending after false-twisting separately, or interlacing blending after either one of which is Taslan processing, Taslan blending after interlacing blending, or Taslan blending. The mixed fiber composite yarn obtained by such a method is preferably provided with a degree of entanglement of 10 yarns / m or more, preferably 15 to 50 yarns / m.
[0034]
Hereinafter, the present invention will be described in more detail with reference to Examples.
In addition, the measurement method and measurement conditions of the physical properties performed in the examples will be described.
(1) Intrinsic viscosity
The intrinsic viscosity [η] is a value determined based on the definition of the following equation.
[Η] = lim (ηr-1) / C
C → 0
Ηr in the definition formula is a value obtained by dividing the viscosity at 35 ° C. of a diluted solution of a PTT polymer dissolved in an o-chlorophenol solvent having a purity of 98% or more by the viscosity of the solvent measured at the same temperature. It is defined as viscosity. C is the polymer concentration expressed in g / 100 ml.
[0035]
(2) Fineness fluctuation value U% / U% waveform height difference / fineness fluctuation frequency analysis
U% is measured at the same time as obtaining a fineness variation value chart (graph; Diagram Mass) by the following method.

[0036]
・ Fineness fluctuation value U%
The fluctuation chart and the displayed fluctuation values were read directly.
・ U% waveform height difference
The measurement is performed under the same conditions as in (2) except that the measurement method is inert and the yarn length is 2000 m, and a chart is taken. Thereafter, the largest one is read from the height difference between the peaks and valleys that are continuous in the yarn length direction.
・ Fineness fluctuation frequency analysis
Using the fineness fluctuation frequency analysis software attached to Evenness Tester, measure 2000 m under the above conditions, and read the period and CV value.
[0037]
(3) Cold air speed time fluctuation
The center of the cold air blowing plate is measured with an anemometer Crimomaster 6543 (manufactured by Nippon Kanomax) for 5 minutes, and a chart is drawn. The maximum value and the minimum value of the wind speed during this time are read, and the difference between them is defined as the time variation of the cool wind speed.
(4) Dry heat shrinkage stress value
It measured using the thermal-stress measuring device (made by Kanebo Engineering Co., Ltd., brand name KE-2).
[0038]
The fiber is cut to a length of about 20 cm, which is tied at both ends to form a loop and loaded into a measuring instrument. The measurement is performed under the conditions of an initial load of 0.05 cN / dtex and a heating rate of 100 ° C./min, and the temperature change of the thermal stress is written on a chart. The thermal contraction stress draws a mountain-shaped curve in a high temperature range. From the read value (cN) of the peak value, a value obtained by the following equation was defined as a dry heat shrinkage stress value.
Dry heat shrinkage stress value (cN / dtex) = (read value of peak value cN) / (dtex × 2) −initial load (cN / dtex)
[0039]
(5) Expansion and contraction rate under load (CE_3.5  )
The yarn is squeezed 10 times with a 1.125 m circumference measuring machine, and 3.5 × 10^-3Under a load of cN / dtex, heat treatment is performed in boiling water for 30 minutes. Then, a dry heat treatment is performed at 180 ° C. for 15 minutes while applying the same load. After the treatment, the plate was allowed to stand for 24 hours in a constant temperature and humidity room specified in JIS-L-1013. Next, the skein is subjected to the load shown below to measure the skein length, and the expansion and contraction rate is measured from the following equation.
Expansion and contraction rate under load (CE_3.5  )% = (L2−L1) / L1 × 100
However, L1 = 1 × 10^-3Skew length with cN / dtex load applied
L2 = 0.18 cN / dtex Skew length with load applied
[0040]
(6) Form of crimp
The yarn is squeezed 10 times with a measuring machine having a circumference of 1.125 m and heat-treated in boiling water without load for 30 minutes. Then, after air-drying, the form of the crimp is observed using a microscope at a magnification of 150 times.
(7) Spinning stability
Using a melt spinning-continuous drawing machine equipped with a spinning end of 8 ends per spindle, melt spinning-continuous drawing was performed for 2 days for each example. The following judgment was made based on the number of occurrences of yarn breakage during this period and the frequency of occurrence of fluff (the ratio of the number of fluff-generated packages) present in the obtained composite fiber package.
◎; 0 times of thread breakage, fluff generation package ratio 5% or less
○ ： Less than 2 thread breaks, fluff generation package ratio less than 10%
×: 3 times or more yarn breakage, fluff generation package ratio 10% or more
[0041]
(8) Evaluation of weft spots on fabric
Fabrication of the fabric was performed as follows.
A plain woven fabric was prepared by using a 56 dtex / 24f PTT single fiber (Asahi Kasei "Solo") non-twisted and glued yarn as the warp, and using the 56 dtex / 24f composite fiber of each of Examples and Comparative Examples of the present invention as the weft. .

The obtained greige was continuously scoured at 95 ° C. with an open soaper, dried in a cylinder at 120 ° C., and then dyed at 120 ° C. with a jet dyeing machine. Next, a series of finishing and tentering heat setting processes were performed at 175 ° C. The obtained woven fabric was inspected by a skilled inspection technician, and the weft dyeing quality was determined as follows.
◎ ： Excellent, without defects such as wrinkles, sink marks and spots
○ ： Good without defects such as wrinkles, sink marks, spots, etc.
×: Any defects such as wrinkles, sink marks, and spots on Yang willow
[0042]
Examples 1-4, Comparative Examples 1-3
In the present embodiment, the effect of the time variation of the length of the heat retaining region from the spinning surface to the start of cooling and the cooling air velocity will be described.
As one component, a PTT having an intrinsic viscosity of 1.3% containing 0.4% by weight of titanium oxide and a PTT pellet containing 0.4% by weight of titanium oxide having an intrinsic viscosity of 0.9% as shown in FIG. A 56 dtex / 24 filament PTT composite fiber package was produced using a spinning machine and a winder having three pairs of godet rolls.
[0043]
The spinning conditions in this embodiment are as follows.

[0044]

Table 1 shows the non-blast area length during spinning, the variation with time in cold air, the physical properties and evaluation of the obtained fiber. As is evident from Table 1, if the time variation of the length of the heat retaining area and the time of the cold air velocity are within the range of the present invention, the obtained fiber satisfies the requirements of the present invention, and the woven fabric using it as the weft has good quality. Has.
[0045]
[Table 1]

[0046]
Examples 5-6, Comparative Examples 4-5
In the present embodiment, the effects of the ejection linear velocity of the PTT-based composite fiber and the U% of the fiber will be described.
The conjugate fiber was wound under the same conditions as in Example 1 except that the spinning hole diameter was changed.
Table 2 shows the physical properties of the obtained conjugate fiber and woven fabric.
As is clear from Table 2, when the discharge linear velocity is within the range of the present invention, good U% and woven fabric quality are exhibited.
[0047]
[Table 2]

[0048]
Examples 7-9, Comparative Examples 6-7
In this example, the effect of the polymer intrinsic viscosity difference will be described.
The composite fiber was wound under the same conditions as in Example 1 except that the type of the polymer and the intrinsic viscosity were changed.
Table 3 shows the physical properties of the obtained conjugate fiber and woven fabric.
As is clear from Table 3, when the polymer intrinsic viscosity difference is within the range of the present invention, good spinnability and woven fabric stretch performance are obtained.
[0049]
[Table 3]

[0050]
Examples 10 to 11, Comparative Examples 8 to 9
In this embodiment, the effect of the single yarn cross-sectional shape will be described.
The conjugate fiber was wound under the same conditions as in Example 1 except that the spinning shape was changed.
Table 4 shows the physical properties of the obtained conjugate fiber and woven fabric.
As is evident from Table 4, Examples 10 to 11 in which the single yarn cross-sectional shape is within the scope of the present invention show good woven fabric quality, but the cross-sectional area ratio spun by a spinneret in which two types of pore sizes are mixed is shown. Comparative Example 8 larger than 2 and Comparative Example 9 spun in a spout hole shape in which two circles were joined and the flatness was larger than 1.2 resulted in poor woven fabric quality.
[0051]
[Table 4]

[0052]
Example 12, Comparative Examples 10 to 11
In this embodiment, the effect of the distance from the spinneret to the focusing position will be described.
The composite fiber was wound under the same conditions as in Example 1 except that the distance to the convergence position was changed.
Table 5 shows the physical properties of the obtained conjugate fiber and woven fabric.
As is clear from Table 5, Example 12 in which the distance of the convergence position is within the range of the present invention shows good spinnability, but Comparative Examples 10 to 11, which are out of the range of the present invention, have many yarn breaks, and U% also showed a bad value.
[0053]
[Table 5]

[0054]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, it is possible to provide a PTT-based conjugate fiber which is optimal for a lining fabric having good surface quality and moderate stretchability, and a method for producing the same.
[Brief description of the drawings]
FIG. 1 shows an example of a U% chart measured by an inert method. (Bad example outside the scope of the present invention)
FIG. 2 shows an example of a U% chart measured by an inert method. (Example of the present invention)
FIG. 3 shows an example of a chart obtained by performing a frequency analysis with an evenness tester.
FIG. 4 is a schematic view showing an example of a discharge hole used when spinning the conjugate fiber of the present invention.
FIG. 5 is a schematic view showing an example of a spinning-drawing facility for producing the conjugate fiber of the present invention.
[Explanation of symbols]
1: Polymer chip dryer
2: Extruder
3: Polymer chip dryer
4: Extruder
5: Bend
6: Bend
7: Spin head
8: Spin pack
9: Spinneret
10: Multifilament
11: Heat insulation area
12: Cooling air
13: Finishing agent application device
14: 1st godet roll
15: Second godet roll
16: Third godet roll
17: Composite fiber package

Claims (8)

The two polyester components are composed of a single yarn group stuck in a side-by-side type or an eccentric sheath-core type, and at least one component constituting the single yarn is polytrimethylene terephthalate, and the following (1) to (1) A polytrimethylene terephthalate-based composite fiber, which satisfies the requirement of 3).
(1) The cross-sectional area ratio of the constituent single yarns is 2.0 or less at the maximum and minimum. (2) The fineness variation value U% measured by the normal method is 1.2% or less. (3) The fineness variation value is measured by the inert method. In the fineness variation value U% chart, the difference between the peaks and valleys of the continuous waveform in the yarn length direction is 8% or less of the average decitex (however, the fineness variation value U% is measured over a yarn length of 2000 m). 2. The polytrimethylene terephthalate-based composite fiber according to claim 1, wherein a CV value in a cycle of 30 to 80 m by a fineness variation frequency analysis is 0.5% or less. 3. The polytrimethylene terephthalate-based composite fiber according to claim 1 or 2, wherein a dry heat shrinkage stress value is 0.05 to 0.24 cN / dtex. The polytrimethylene terephthalate-based composite fiber according to any one of claims 1 to 3, wherein the cross-sectional shape of the single yarn is substantially circular with a flatness of less than 1.2. The polytrimethylene terephthalate-based composite fiber according to any one of claims 1 to 4, wherein the composite fiber before the boiling water treatment has a spiral crimp. The polytrimethylene terephthalate-based composite fiber according to any one of claims 1 to 5, wherein both components constituting the single yarn are polytrimethylene terephthalate. In producing a composite fiber in which two polyester components consist of a single yarn group bonded to a side-by-side type or an eccentric sheath-core type, and at least one component constituting the single yarn is polytrimethylene terephthalate, A method for producing a polytrimethylene terephthalate-based composite fiber, which satisfies the following requirements (A) to (D).
(A) the difference in intrinsic viscosity between the two polyester components is from 0.1 to 0.9,
(B) discharging at a polymer discharge linear velocity per discharge hole of 4 to 9 m / min,
(C) The heat insulation area from the spinning surface to the start of cooling is set to 50 to 150 mm,
(D) The time change of the cooling air is set within 0.05 m / sec,
(E) The distance from the spinneret to the focusing position is 50 to 200 cm. The method for producing a polytrimethylene terephthalate-based composite fiber according to claim 7, wherein the fiber is a direct spin drawing method in which the cooled and solidified fiber is continuously drawn without being wound once.

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