JP4226137B2 - Method for producing polyamide latent crimped yarn - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、粘度差を有する２種類のポリアミドがサイドバイサイド型に配置された潜在捲縮性能を有するポリアミド潜在捲縮糸の製造方法に関するものである。
【０００２】
【従来の技術】
従来から、ポリアミド繊維は衣料用途に広く用いられている。衣料用ポリアミドの代表であるナイロン６やナイロン６６等で一種類のポリマーからなる単一糸は、繊維自体に伸縮性が殆どないため、仮撚加工等を行って伸縮性を付与し、伸縮性のある織編物用に使用している。しかしながら、このような単一糸に加工を施したものでは、十分に満足できる伸縮性を有する布帛を得ることは困難であった。
【０００３】
そこで、弾性を有する繊維とすることによって伸縮性を有する布帛を得る方法や、あるいは、異なる性質のポリマーを用い、染色等の熱処理で捲縮を発現する潜在捲縮性能を有する複合繊維とすることによって、伸縮性を有する布帛を得る方法が提案されている。
【０００４】
前者の弾性を有する繊維においては、ポリウレタン系弾性糸が多く用いられるが、染色性や耐光性が悪く、ナイロン６やナイロン６６でカバーリング加工をして用いるのが一般的である。また、特開平５７−１９３５２１号公報には、伸縮性を有する繊維として、ナイロン系エラストマーとポリアミドをサイドバイサイド型や偏芯芯鞘型に配した複合繊維が記載されているが、これらの繊維はいずれも、カバーリングの加工費やポリウレタン弾性糸及びナイロン系エラストマーが高価でありコスト面で不利であった。
【０００５】
また、後者の異なる性質のポリマーを用いて複合繊維にする場合には、繊維断面形状をサイドバイサイド型として、２成分のポリマーの粘度差を利用して熱水収縮率差を持たせたり、あるいは、熱水収縮率の異なるポリマーを用いることが一般的である。このような複合繊維は、後加工等が必要ない分製造するにはコスト面で有利であり、布帛にある程度の伸縮を付与することはできたが、十分に満足できる程度の伸縮を付与することはできなかった。
【０００６】
さらには、このようなポリアミド繊維は、ポリウレタン等と比べて初期ヤング率が高く、柔軟性に乏しく、布帛にしたときに風合の硬いものしか得られないという問題があった。
【０００７】
【発明が解決しようとする課題】
本発明は、上記の問題を解決するものであって、コスト面で有利に得ることができ、布帛に十分な伸縮性と柔軟性を付与することが可能なポリアミド潜在捲縮糸の製造方法を提供することを技術的な課題とするものである。
【０００８】
【課題を解決するための手段】
本発明者らは、上記の課題を解決すべく検討した結果、本発明に到達した。すなわち、本発明は、高粘度ポリマーとして相対粘度３．０〜３．５のナイロン６／６６共重合体を用い、低粘度ポリマーとして相対粘度２．０〜２．９のナイロン６を用い、粘度差を有する２種類のポリアミドをサイドバイサイド型の紡糸口金で溶融紡出し、冷却固化し、油剤を付与した後、速度４０００ｍ／分以上で捲き取り、高配向 未延伸糸を得た後、延伸を行う製造方法において、得られた高配向未延伸糸に、延伸倍率１．２〜１．５倍の延伸と１２０〜１６０℃での熱処理を施す、初期ヤング率が１５〜２５ｇ／ｄ、捲縮率が４０％以上であるポリアミド潜在捲縮糸の製造方法を要旨とするものである。
【０００９】
【発明の実施の形態】
以下、本発明について詳細に説明する。本発明の製造方法により得られる潜在捲縮糸は、粘度差を有する２種類のポリアミドをサイドバイサイド型に貼り合わせた繊維であって、高粘度ポリマーとして相対粘度３．０〜３．５のナイロン６／６６共重合体、低粘度ポリマーとして相対粘度２．０〜２．９のナイロン６を用いるものである。
【００１０】
高粘度ポリマーは、熱水収縮率が大きく、さらに、高速紡糸が可能となるように相対粘度が３．０〜３．５である必要がある。したがって、相対粘度がこの範囲を超えると高速紡糸時の製糸性が劣り、低いと捲縮性能が劣る。
【００１１】
そして、このような高粘度ポリマーとして、ナイロン６にナイロン６６を共重合した共重合ポリマーとする。ナイロン６６の共重合割合は、５〜２０モル％とすることが好ましい。
【００１２】
また、低粘度ポリマーは、高い捲縮性能を得るために、熱水収縮率が小さく、安価なポリマーとして、ナイロン６を用い、その相対粘度は２．０〜２．９、さらに好ましくは２．３〜２．７とする。２．０未満であると、高粘度ポリマーとの粘度差が大きくなりすぎ、糸曲がりが大きく製糸性が悪くなる。一方、２．９を超えると高粘度ポリマーとの粘度差が小さくなり、捲縮性能に劣るものとなる。
【００１３】
したがって、高粘度ポリマーと低粘度ポリマーとの相対粘度の差は、好ましくは、０．４〜１．２、さらに好ましくは０．５〜１．０である。
【００１４】
なお、高粘度ポリマー、低粘度ポリマーともに本発明の効果を損なわない範囲であれば、艶消剤、難燃剤、顔料等の種々の添加物を添加してもよい。
【００１５】
また、本発明の製造方法により得られる潜在捲縮糸は、高粘度ポリマーと低粘度ポリマーがサイドバイサイド型に貼り合わされたものであり、両成分の割合、貼り合わせ面の形状は特に限定されるものではないが、重量比で高粘度ポリマー／低粘度ポリマーが２／１〜１／２程度とすることが好ましい。そして、繊維の断面形状も丸断面のみならず、各種の異形断面形状のものでもよい。
【００１６】
そして、本発明の製造方法により得られる潜在捲縮糸は、初期ヤング率が１５〜２５ｇ／ｄ、さらに好ましくは１５〜２０ｇ／ｄである。初期ヤング率をこの範囲内にすることによって、布帛に適度の柔軟性を持たせることができる。したがって、初期ヤング率が１５ｇ／ｄ未満であると布帛が柔軟になりすぎ、２５ｇ／ｄを超えると、柔軟性に乏しく、硬い風合の布帛となる。
【００１７】
さらに、本発明の製造方法により得られる潜在捲縮糸は、伸縮性の良好な布帛を得るために、潜在捲縮が発現したときの捲縮率が４０％以上であることが必要である。これよりも小さいと伸縮性が劣り好ましくない。ここで、捲縮率とは、本発明の製造方法により得られる潜在捲縮糸を繊度測定用検尺器にて５回カセ取りを行い２重のループにし、１／６０００ｇ／ｄの荷重をかけた状態で沸騰水中に３０分間浸漬した後取り出し、その状態で３０分間風乾し、その後、荷重を１／５００ｇ／ｄに変更して長さＡを測定し、次に荷重１／２０ｇ／ｄをかけて長さＢを求め、次の式で算出するものである。
捲縮率（％）＝〔（Ｂ−Ａ）／Ｂ〕×１００
【００１８】
なお、高粘度ポリマーの相対粘度を前記範囲内で変更すればある程度、捲縮率を調整することができる。
【００１９】
また、本発明の製造方法により得られる潜在捲縮糸は、布帛としたときに柔軟性、伸縮性に優れ、特に衣料用途に適したものであり、強度は３．０〜４．０ｇ／ｄ、伸度３５〜４５％、熱水収縮率１０〜２５％、単糸繊度２．０〜６．０ｄ程度のものである。
【００２０】
次に、本発明の潜在捲縮糸の製造方法について説明する。まず、高粘度ポリ マーとして相対粘度３．０〜３．５のナイロン６／６６共重合体を用い、低粘度ポリマーとして相対粘度２．０〜２．９のナイロン６を用い、粘度差を有する２種類のポリアミドをサイドバイサイド型の紡糸口金で溶融紡出するが、このとき、常用の複合紡糸装置を用いて、常用のサイドバイサイド型の紡糸口金で溶融紡糸することができる。そして、紡出された糸条を冷却固化し、油剤を付与した後、速度４０００ｍ／分以上で捲き取り、高配向未延伸糸を得る。
【００２１】
高配向未延伸糸を得る際には、４０００ｍ／分以上の速度で捲き取る必要がある。これよりも低いと延伸倍率が大きくなり、捲縮性能が低下したり、初期ヤング率が高くなり、柔軟性に劣るようになる。
【００２２】
得られた高配向未延伸糸に延伸と熱処理を施すことによって、上記のような潜在捲縮糸を得るが、このとき、延伸は、延伸倍率１．２〜１．５倍とし、熱処理は、１２０〜１６０℃で施す。本発明の製造方法においては、熱処理と延伸の順序は、延伸と熱処理を同時に行うか、もしくは延伸後に熱処理を行うことが好ましい。
【００２３】
延伸については、延伸倍率１．２〜１．５の低倍率で行う。この範囲より小さいと強度が劣り、捲縮率も低くなる。また、この範囲より大きいと初期ヤング率が高くなり、柔軟性に乏しくなる。
【００２４】
熱処理については、高粘度ポリマーは結晶性が低く、適度の熱処理を行わないと熱水収縮率が大きく、捲縮による収縮以外に繊維自体も収縮を起こすことがあるので、これを防ぐために、１２０〜１６０℃で熱処理する。熱処理温度が１２０℃未満であると、繊維自体の収縮を防ぐことができず、一方、１６０℃を超えると、高粘度ポリマーの熱水収縮率が小さくなり、潜在捲縮性能が低下し、好ましくない。
【００２５】
これらの熱処理と延伸は、常用の延伸ピンやローラを用いた延伸装置で行うことができるが、仮撚加工を同時に行う場合は、仮撚加工機で延伸と熱処理を行ってもよい。
【００２６】
【実施例】
次に、本発明を実施例によって具体的に説明する。なお、実施例における各物性値は、次の方法で測定した。
（ａ）相対粘度
９６％硫酸を溶媒とし、濃度１ｇ／ｄｌ、温度２５℃で測定した。
（ｂ）強伸度、初期ヤング率
島津製作所製オートグラフＡＧＳー５Ｇ型を用いて、ＪＩＳ Ｌ １０１３に準じて測定した。
（ｃ）熱水収縮率
糸条を５０ｃｍのループにし、１／３０ｇ／ｄの初荷重をかけて長さＡを求め、次いでフリーにして沸騰水中に１５分間浸漬した後、自然乾燥し、再び１／３０ｇ／ｄの荷重をかけて長さＢを求め、次の式で算出した。
熱水収縮率（％）＝〔（Ａ−Ｂ）／Ａ〕×１００
（ｄ）捲縮率
前記の方法で測定した。
【００２７】
実施例１、比較例１〜２
低粘度ポリマーに相対粘度２．５０のナイロン６を用い、高粘度ポリマーには相対粘度３．１０のナイロン６／６６共重合体（ナイロン６６の共重合量が１５モル％）を用いて常用の複合溶融紡糸装置にサイドバイサイド型複合紡糸口金を装着し、低粘度ポリマーと高粘度ポリマーとの複合比（重量比）を１：１として、ポリマー温度２７０℃で溶融紡出した。この複合繊維を冷却し、油剤を付与した後、速度４３６０ｍ／分の第１ローラに引き取り、引き続いて延伸することなく速度４３７０ｍ／分の第２ローラに引き取り、速度４３００ｍ／分のワインダーに捲き取って６５ｄ／１２ｆの丸断面形状の高配向未延伸糸を得た。次に、得られた高配向未延伸糸を、延伸ゾーンで径が６ｍｍの非加熱延伸ピン（アルミナ製）に１回掛けて表１に示した延伸倍率となるように延伸しながら、長さ３０ｃｍ、温度１６０℃の加熱板に接触させて熱処理し、速度６８０ｍ／分で引き取り、スピンドル回転７６００ｒｐｍのパーンにトラベラ３２番を用いて巻き取り、５０ｄ／１２ｆの潜在捲縮糸を得た。
【００２８】
実施例２
第１ローラの速度を４１４５ｍ／分、第２ローラの速度を４１５５ｍ／分、ワインダーの速度を４１００ｍ／分とした以外は実施例１と同様に行った。
【００２９】
比較例３
高粘度ポリマーを相対粘度２．８０のナイロン６／６６共重合体とした以外は実施例１と同様に行った。
【００３０】
比較例４
高粘度ポリマーを相対粘度３．８０のナイロン６／６６共重合体とした以外は実施例１と同様に行った。
【００３１】
比較例５
低粘度ポリマーを相対粘度３．００のナイロン６とした以外は実施例１と同様に行った。
【００３２】
比較例６
低粘度ポリマーを相対粘度１．８０のナイロン６とした以外は実施例１と同様に行った。
【００３３】
比較例７
第１ローラ速度１５１０ｍ／分、第２ローラ速度１５２０ｍ／分、ワインダー速度１５００ｍ／分で１１５ｄ／１２ｆの低配向の未延伸糸を得た後、延伸倍率２．３０で延伸した以外は実施例１と同様に行った。
【００３４】
実施例１〜２、比較例１〜７で得られた繊維の強度、伸度、熱水収縮率、初期ヤング率、捲縮率を表１に示す。
【００３５】
【表１】
【００３６】
表１から明らかなように、実施例１〜２の繊維は、十分な捲縮性能と低い初期ヤング率を有し、強度、伸度等にも優れ、製糸性も良好であった。一方、比較例１の繊維は、延伸倍率が低すぎたため、初期ヤング率が低すぎ、強度にも劣っていた。比較例２の繊維は、延伸倍率が高すぎたため、初期ヤング率が高すぎ、熱水収縮率も高かった。比較例３の繊維は、高粘度ポリマーの相対粘度が低すぎたため、捲縮率の低い繊維となった。比較例４の繊維は、高粘度ポリマーの相対粘度が高すぎたため、糸切れが多く捲き取ることができなかった。比較例５の繊維は、低粘度ポリマーの相対粘度が高すぎたため、高粘度ポリマーとの差が小さくなり、捲縮率の低い繊維となった。比較例６の繊維は、低粘度ポリマーの相対粘度が低すぎたため、高粘度ポリマーとの粘度差が大きくなりすぎ、糸曲がりが激しく製糸が困難であった。また、比較例７の繊維は、低配向の未延伸糸を延伸したものであるため、高い延伸倍率で延伸することが必要になり、強度は高いが初期ヤング率も高くなり、捲縮性能にも劣るものとなった。
【００３７】
【発明の効果】
本発明のポリアミド潜在捲縮糸の製造方法によれば、高速で紡糸した高配向未延伸糸を用いているので、操業性よく、低コストでポリアミド潜在捲縮糸を得ること ができる。そして、本発明の製造方法により得られるポリアミド潜在捲縮糸は、潜在を発現させたときの捲縮率が高く、初期ヤング率が低いため、製編織した後、熱処理を施すと十分な伸縮性と柔軟性を有する布帛とすることができる。 [0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a polyamide latent crimped yarn having latent crimping performance in which two kinds of polyamides having a viscosity difference are arranged in a side-by-side manner.
[0002]
[Prior art]
Conventionally, polyamide fibers have been widely used in clothing applications. A single yarn made of one kind of polymer such as nylon 6 or nylon 66, which is a representative polyamide for clothing, has almost no elasticity in the fiber itself. It is used for some woven and knitted fabrics. However, with such a single yarn processed, it has been difficult to obtain a fabric having sufficiently satisfactory stretchability.
[0003]
Therefore, a method of obtaining a stretchable fabric by using an elastic fiber, or a composite fiber having latent crimping performance using a polymer having different properties and developing crimps by heat treatment such as dyeing. Has proposed a method of obtaining a stretchable fabric.
[0004]
Polyurethane-based elastic yarns are often used for the former elastic fibers, but they are poor in dyeability and light resistance, and are generally used after being covered with nylon 6 or nylon 66. Japanese Patent Application Laid-Open No. 57-193521 describes a composite fiber in which a nylon elastomer and polyamide are arranged in a side-by-side type or an eccentric core-sheath type as a stretchable fiber. However, the processing cost of the cover ring, the polyurethane elastic yarn and the nylon elastomer are expensive, which is disadvantageous in terms of cost.
[0005]
In addition, in the case of using the latter polymer having different properties to form a composite fiber, the fiber cross-sectional shape is a side-by-side type, and the difference in viscosity of the two-component polymer is used to give a difference in hot water shrinkage, or It is common to use polymers with different hot water shrinkage rates. Such a composite fiber is advantageous in terms of cost to manufacture because it does not require post-processing and the like, and it has been possible to give a certain degree of expansion / contraction to the fabric, but to provide a sufficiently satisfactory expansion / contraction I couldn't.
[0006]
Furthermore, such a polyamide fiber has a problem that it has a high initial Young's modulus compared to polyurethane and the like, is poor in flexibility, and can only be obtained with a hard texture when made into a fabric.
[0007]
[Problems to be solved by the invention]
The present invention solves the above-described problems, and provides a method for producing a polyamide latent crimped yarn that can be advantageously obtained in terms of cost and can impart sufficient stretchability and flexibility to a fabric. It is a technical problem to provide.
[0008]
[Means for Solving the Problems]
The inventors of the present invention have arrived at the present invention as a result of studies to solve the above problems. That is, the present invention uses a nylon 6/66 copolymer having a relative viscosity of 3.0 to 3.5 as a high-viscosity polymer, and uses nylon 6 having a relative viscosity of 2.0 to 2.9 as a low-viscosity polymer. Two types of polyamides with a difference are melt-spun with a side-by-side spinneret, cooled and solidified, applied with an oil agent, scraped at a speed of 4000 m / min or more to obtain a highly oriented undrawn yarn, and then drawn. In the production method, the obtained highly oriented undrawn yarn is subjected to drawing at a draw ratio of 1.2 to 1.5 times and heat treatment at 120 to 160 ° C., an initial Young's modulus of 15 to 25 g / d, and a crimp rate The gist of the present invention is a method for producing a polyamide latently crimped yarn having a yarn content of 40% or more .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail. The latent crimped yarn obtained by the production method of the present invention is a fiber in which two kinds of polyamides having a viscosity difference are bonded to a side-by-side type, and nylon 6 having a relative viscosity of 3.0 to 3.5 as a high-viscosity polymer. / 66 copolymer, nylon 6 having a relative viscosity of 2.0 to 2.9 is used as the low viscosity polymer.
[0010]
The high-viscosity polymer has a high hot water shrinkage and further needs to have a relative viscosity of 3.0 to 3.5 so that high-speed spinning is possible. Therefore, if the relative viscosity exceeds this range, the spinning performance at high speed spinning is poor, and if it is low, the crimping performance is poor.
[0011]
As such a high-viscosity polymer, a copolymer obtained by copolymerizing nylon 66 with nylon 6 is used. The copolymerization ratio of nylon 66 is preferably 5 to 20 mol%.
[0012]
Moreover, in order to obtain a high crimping performance, the low-viscosity polymer has a small hydrothermal shrinkage rate, and nylon 6 is used as an inexpensive polymer, and the relative viscosity thereof is 2.0 to 2.9, more preferably 2. 3 to 2.7. If it is less than 2.0, the difference in viscosity from the high-viscosity polymer becomes too large, resulting in large yarn bending and poor yarn production. On the other hand, if it exceeds 2.9, the difference in viscosity from the high-viscosity polymer will be small, and the crimping performance will be poor.
[0013]
Therefore, the difference in relative viscosity between the high viscosity polymer and the low viscosity polymer is preferably 0.4 to 1.2, and more preferably 0.5 to 1.0.
[0014]
Various additives such as a matting agent, a flame retardant, and a pigment may be added as long as the effects of the present invention are not impaired in both the high viscosity polymer and the low viscosity polymer.
[0015]
Further, the latent crimped yarn obtained by the production method of the present invention is one in which a high-viscosity polymer and a low-viscosity polymer are bonded to a side-by-side type, and the ratio of both components and the shape of the bonded surface are particularly limited. However, it is preferable that the high-viscosity polymer / low-viscosity polymer be about 2/1 to 1/2 by weight ratio. The cross-sectional shape of the fiber may be not only a round cross-section but also various irregular cross-sectional shapes.
[0016]
The latent crimped yarn obtained by the production method of the present invention has an initial Young's modulus of 15 to 25 g / d, more preferably 15 to 20 g / d. By setting the initial Young's modulus within this range, the fabric can be provided with appropriate flexibility. Therefore, if the initial Young's modulus is less than 15 g / d, the fabric becomes too soft, and if it exceeds 25 g / d, the fabric is poor in flexibility and has a hard texture.
[0017]
Furthermore, the latent crimped yarn obtained by the production method of the present invention needs to have a crimp rate of 40% or more when latent crimp is developed in order to obtain a fabric having good stretchability. If it is smaller than this, the stretchability is inferior, which is not preferable. Here, the crimping rate means that the latent crimped yarn obtained by the production method of the present invention is cut five times with a measuring instrument for fineness measurement to form a double loop, and a load of 1/6000 g / d is applied. After being immersed in boiling water for 30 minutes in the applied state, it is taken out and air-dried in that state for 30 minutes. After that, the load A is changed to 1/500 g / d, the length A is measured, and then the load is 1/20 g / d. The length B is obtained by multiplying by the following formula.
Crimp rate (%) = [(B−A) / B] × 100
[0018]
The crimp rate can be adjusted to some extent by changing the relative viscosity of the high viscosity polymer within the above range.
[0019]
Further, the latent crimped yarn obtained by the production method of the present invention is excellent in flexibility and stretchability when made into a fabric, particularly suitable for clothing use, and has a strength of 3.0 to 4.0 g / d. , Elongation 35-45%, hot water shrinkage 10-25%, single yarn fineness 2.0-6.0d.
[0020]
Next, the manufacturing method of the latent crimped yarn of this invention is demonstrated. First, using a nylon 6/66 copolymer having a relative viscosity of 3.0 to 3.5 as a high viscosity poly-mer, using nylon 6 having a relative viscosity of from 2.0 to 2.9 as the low viscosity polymer has a viscosity difference Two kinds of polyamides are melt-spun with a side-by-side type spinneret, and at this time, they can be melt-spun with a usual side-by-side type spinneret using a conventional compound spinning device. Then, the spun yarn is cooled and solidified, and an oil agent is applied, and then it is wound at a speed of 4000 m / min or more to obtain a highly oriented undrawn yarn.
[0021]
When obtaining a highly oriented undrawn yarn, it is necessary to wind off at a speed of 4000 m / min or more. If it is lower than this, the draw ratio becomes large, the crimping performance is lowered, the initial Young's modulus is high, and the flexibility is inferior.
[0022]
By subjecting the resulting heat-treated and drawn to a highly oriented undrawn yarn, but obtain a latent standing crimped yarn as described above, this time, stretching, and stretching ratio 1.2 to 1.5 times, the heat treatment , 120-160 ° C. In the production method of the present invention, the order of the heat treatment and stretching is preferably such that the stretching and the heat treatment are performed simultaneously or the heat treatment is performed after the stretching.
[0023]
Stretching is performed at a low magnification of 1.2 to 1.5. If it is smaller than this range, the strength is inferior and the crimp rate is also lowered. On the other hand, if it is larger than this range, the initial Young's modulus becomes high and the flexibility becomes poor.
[0024]
As for the heat treatment, the high viscosity polymer has low crystallinity, and if the heat treatment is not performed appropriately, the hot water shrinkage rate is large, and the fiber itself may shrink in addition to the shrinkage due to crimping. Heat treatment at ~ 160 ° C. If the heat treatment temperature is less than 120 ° C., the shrinkage of the fiber itself cannot be prevented. On the other hand, if it exceeds 160 ° C., the hot water shrinkage rate of the high-viscosity polymer decreases, and the latent crimping performance decreases. Absent.
[0025]
These heat treatment and stretching can be performed with a stretching apparatus using a conventional stretching pin or roller. However, when false twisting is performed simultaneously, stretching and heat treatment may be performed with a false twisting machine.
[0026]
【Example】
Next, the present invention will be specifically described with reference to examples. In addition, each physical-property value in an Example was measured with the following method.
(A) Measured at a concentration of 1 g / dl and a temperature of 25 ° C. using sulfuric acid as a solvent with a relative viscosity of 96%.
(B) High elongation, initial Young's modulus Measured according to JIS L 1013 using an autograph AGS-5G manufactured by Shimadzu Corporation.
(C) Make a hot water shrinkage yarn into a 50 cm loop, apply an initial load of 1/30 g / d to determine the length A, then set it free and immerse in boiling water for 15 minutes, then air dry, and again The length B was obtained by applying a load of 1/30 g / d, and calculated by the following formula.
Hot water shrinkage (%) = [(A−B) / A] × 100
(D) Crimp rate Measured by the method described above.
[0027]
Example 1, Comparative Examples 1-2
Nylon 6 having a relative viscosity of 2.50 is used for the low-viscosity polymer, and a nylon 6/66 copolymer having a relative viscosity of 3.10 (the copolymerization amount of nylon 66 is 15 mol%) is used for the high-viscosity polymer. A side-by-side type composite spinneret was attached to the composite melt spinning apparatus, and melt spinning was performed at a polymer temperature of 270 ° C. with a composite ratio (weight ratio) of the low-viscosity polymer to the high-viscosity polymer being 1: 1. After cooling this composite fiber and applying an oil agent, it is taken up by a first roller at a speed of 4360 m / min, and subsequently taken up by a second roller at a speed of 4370 m / min without stretching, and wound on a winder at a speed of 4300 m / min. Thus, a highly oriented undrawn yarn having a circular cross section of 65d / 12f was obtained. Next, the obtained highly oriented unstretched yarn was stretched once in a stretching zone so as to have a stretching ratio shown in Table 1 by being stretched once on a non-heated stretching pin (made of alumina) having a diameter of 6 mm. Heat treatment was performed by contacting with a heating plate of 30 cm and a temperature of 160 ° C., and it was taken up at a speed of 680 m / min.
[0028]
Example 2
The same operation as in Example 1 was performed except that the speed of the first roller was 4145 m / min, the speed of the second roller was 4155 m / min, and the speed of the winder was 4100 m / min.
[0029]
Comparative Example 3
The same procedure as in Example 1 was conducted except that the high viscosity polymer was a nylon 6/66 copolymer having a relative viscosity of 2.80.
[0030]
Comparative Example 4
The same procedure as in Example 1 was conducted except that the high viscosity polymer was a nylon 6/66 copolymer having a relative viscosity of 3.80.
[0031]
Comparative Example 5
The same procedure as in Example 1 was performed except that nylon 6 having a relative viscosity of 3.00 was used as the low viscosity polymer.
[0032]
Comparative Example 6
The same procedure as in Example 1 was performed except that the low viscosity polymer was nylon 6 having a relative viscosity of 1.80.
[0033]
Comparative Example 7
Example 1 except that a low orientation unstretched yarn of 115d / 12f was obtained at a first roller speed of 1510 m / min, a second roller speed of 1520 m / min, and a winder speed of 1500 m / min, and then drawn at a draw ratio of 2.30. As well as.
[0034]
Table 1 shows the strength, elongation, hydrothermal shrinkage, initial Young's modulus, and crimp of the fibers obtained in Examples 1 and 2 and Comparative Examples 1 to 7.
[0035]
[Table 1]
[0036]
As is apparent from Table 1, the fibers of Examples 1 and 2 had sufficient crimp performance and a low initial Young's modulus, were excellent in strength, elongation, and the like, and had good yarn forming properties. On the other hand, the fiber of Comparative Example 1 had an initial Young's modulus too low and inferior in strength because the draw ratio was too low. Since the fiber of Comparative Example 2 had a draw ratio that was too high, the initial Young's modulus was too high and the hot water shrinkage rate was also high. The fiber of Comparative Example 3 was a fiber with a low crimp rate because the relative viscosity of the high viscosity polymer was too low. Since the relative viscosity of the high-viscosity polymer was too high, the fiber of Comparative Example 4 had many yarn breaks and could not be scraped off. Since the relative viscosity of the low-viscosity polymer was too high, the difference from the high-viscosity polymer was small, and the fiber of Comparative Example 5 was a fiber having a low crimp rate. In the fiber of Comparative Example 6, the relative viscosity of the low-viscosity polymer was too low, so that the difference in viscosity from the high-viscosity polymer was too large, resulting in severe yarn bending and difficulty in spinning. Further, since the fiber of Comparative Example 7 is obtained by drawing an undrawn yarn with low orientation, it is necessary to draw at a high draw ratio, and the strength is high but the initial Young's modulus is high, so that the crimp performance is high. Was also inferior.
[0037]
【The invention's effect】
According to the method for producing a polyamide latent crimped yarn of the present invention, since a highly oriented undrawn yarn spun at high speed is used, a polyamide latent crimped yarn can be obtained with good operability and low cost . And, the polyamide latent crimped yarn obtained by the production method of the present invention has a high crimp rate when the latent is expressed and a low initial Young's modulus. And a flexible fabric.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09866799A JP4226137B2 (en) | 1999-04-06 | 1999-04-06 | Method for producing polyamide latent crimped yarn |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09866799A JP4226137B2 (en) | 1999-04-06 | 1999-04-06 | Method for producing polyamide latent crimped yarn |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008267482A Division JP4769279B2 (en) | 2008-10-16 | 2008-10-16 | Polyamide latent crimped yarn |
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| JP2000290837A JP2000290837A (en) | 2000-10-17 |
| JP4226137B2 true JP4226137B2 (en) | 2009-02-18 |
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| JP4558970B2 (en) * | 2001-03-27 | 2010-10-06 | ユニチカトレーディング株式会社 | Elastic polyamide fabric |
| KR100493508B1 (en) * | 2001-12-28 | 2005-06-07 | 주식회사 효성 | Method for manufacturing nylon having potential crimping |
| KR20040046695A (en) * | 2002-11-28 | 2004-06-05 | 주식회사 효성 | A Process for preparing Stretchable Woven Fabric having Two-Way and Soft Stretching Characteristics and the Fabric produced by the process |
| CN109355716A (en) * | 2018-12-04 | 2019-02-19 | 吴江精美峰实业有限公司 | A kind of process units and its production method of nylon 6 and nylon66 fiber composite elastic fiber arranged side by side |
| EP4006216A4 (en) * | 2019-07-31 | 2024-03-20 | Toray Industries | Polyamide composite fiber and finished yarn |
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