JP4115029B2 - Polyester composite fiber for stretch woven and knitted fabric - Google Patents

Polyester composite fiber for stretch woven and knitted fabric Download PDF

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Publication number
JP4115029B2
JP4115029B2 JP04153499A JP4153499A JP4115029B2 JP 4115029 B2 JP4115029 B2 JP 4115029B2 JP 04153499 A JP04153499 A JP 04153499A JP 4153499 A JP4153499 A JP 4153499A JP 4115029 B2 JP4115029 B2 JP 4115029B2
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fiber
polyester
intrinsic viscosity
line segment
composite fiber
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JP2000239927A (en
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繁満 村瀬
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ユニチカ株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、嵩高性に富み、従来にないソフトな風合いを有するストレッチ性織編物用のポリエステル複合繊維に関するものである。
【0002】
【従来の技術】
ストレッチ機能を有する織編物を得るために、極限粘度の異なる2種類のポリエステルをサイドバイサイド型に接合した潜在捲縮性の複合繊維を使用することはよく知られている。この潜在捲縮性複合繊維に糸条や織編物の状態で捲縮発現処理を施して捲縮を発現させ、ストレッチ性能を具備する織編物として利用する際には、糸条の3次元クリンプ形態や捲縮性能が布帛にしたときのストレッチ性能に大きく影響する。
【0003】
従来、このような潜在捲縮性ポリエステル複合繊維を得るために、両ポリエステルの極限粘度差を可能な限り大きくし、繊維にしたときの収縮差を大きくしており、さらには、紡糸操業性を向上させるために、繊維横断面の両ポリエステルの接合面を直線的にする努力がなされており、これらの複合繊維について種々の提案がなされている。
【0004】
例えば、2種類のポリエステルの極限粘度差が大きい場合などは、溶融紡糸時に吐出糸条が屈曲を起こす。また、極限粘度差がさらに大きくなると、屈曲が過度に進み、糸条が紡糸口金に付着して切断が生じ、安定して紡糸を行うことができない。そこで、粘度の異なるポリマーを一対の吐出孔から吐出させて、サイドバイサイド型の複合繊維を形成するようにした口金において、1対をなす吐出孔が口金面と直交する方向に対してなす各々の傾斜角度や、1対の吐出孔間の距離等を規制した溶融紡糸用口金(特公昭61−60163号公報)が提案されている。
【0005】
この溶融紡糸用口金を用いて紡糸すると、繊維横断面における2種類のポリエステルの接合面は直線的になる。この場合、2種類のポリエステルの極限粘度差が大きくても紡糸操業性は良好であるが、2種類のポリエステルの接合面が直線的であるため、発現する捲縮の3次元クリンプ形態が小さく、単位長さ当たりに捲縮が非常に多く発現するため、単糸同士にはまり込みが発生し、織編物にしたときに嵩高性に欠けたフラットな風合になるという問題があった。
【0006】
【発明が解決しようとする課題】
本発明は、上記の問題を解消し、製編織すれば、嵩高性に富み、従来にないソフトな風合を有するストレッチ性織編物となるストレッチ性織編物用ポリエステル複合繊維を提供することを技術的な課題とするものである。
【0007】
【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るために鋭意研究した結果、繊維横断面における両ポリエステルの接合面形状を特定の範囲内で湾曲させ、かつ、糸条のヤング率を特定の範囲内にすることにより、製編織して得られる布帛に、嵩高性、従来にないソフトな風合、ストレッチ性を同時に付与することができるポリエステル複合繊維が得られることを知見して本発明に到達した。
【0008】
すなわち、本発明は、極限粘度の異なる2種類のポリエステルとして、トリメチレンテレフタレートの繰り返し単位が85%以上のポリトリメチレンテレフタレートを用い、2種類のポリエステルが互いにサイドバイサイド型に複合され、繊維横断面の両ポリエステルの接合面形状が湾曲している繊維であり、低極限粘度ポリエステルの極限粘度を0.6〜1.10、高極限粘度ポリエステルの極限粘度を0.7〜1.30、両ポリエステル間の極限粘度差を0.1以上とし、接合面と繊維外周との2つの接点a、bを結んだ線分abの中心を通り、線分abと直交した直線Xと高粘度側ポリエステルの繊維外周との交点をc、接合面との交点をd、線分cdと線分abとの交点をeとしたとき、線分deと線分cdとの長さの比de/cdが下記式(1)を満足し、かつ、糸条のヤング率が40g/D以下、捲縮率が30%以上であることを特徴とするストレッチ性織編物用ポリエステル複合繊維を要旨とするものである。
0.05≦de/cd≦0.80 (1)
【0009】
【発明の実施と形態】
以下、本発明について詳細に説明する。
【0010】
本発明の複合繊維は、極限粘度の異なる2種類のポリエステルが、互いにサイドバイサイド型に接合された繊維であり、かつ、繊維横断面における2種類のポリエステルの接合面形状が湾曲している必要がある。繊維横断面における2種類のポリエステルの接合面が直線的であると、収縮処理によって発現する捲縮の3次元クリンプ形態が小さくなり、単位長さ当たりに捲縮が非常に多く発現するため、単糸同士にはまり込みが発生する。このため、織編物の嵩高性が低くなる。
【0011】
図1は、本発明の複合繊維の一実施態様を示す横断面図である。図1において、両ポリエステルの接合面と繊維外周との2つの接点a、bを結んだ線分abの中心を通り、線分abと直交する直線Xと高粘度側ポリエステルの繊維外周との交点をc、接合面との交点をdとし、線分cdと線分abとの交点をeとする。本発明の複合繊維は、線分deと線分cdとの長さの比(以下、de/cd)を前記(1)式のように0.05〜0.80とする必要がある。この比が0.05未満になると、繊維横断面の両ポリエステルの接合面が直線的になり、織編物の嵩高性は低いものとなる。一方、この比が0.80を超えると、収縮処理によって発現する捲縮の3次元クリンプ形態は大きくなるが、この比を0.80を超えるようにするためには、両ポリエステルの極限粘度差を大きくする必要があるので、溶融紡糸時に吐出糸条が屈曲して口金面に付着し、このため、糸条の切断が生じて安定した紡糸ができなくなるという問題が生じる。
【0012】
また、本発明の複合繊維は、糸条のヤング率が40g/D以下である必要がある。糸条のヤング率が40g/Dより大きくなると、織編物にしたときの風合いが硬くなり、ソフト感に欠けたものとなる。ヤング率を40g/D以下とする方法は特に限定されるものではないが、例えば、糸条を比較的柔軟な構造のポリエステルで構成させる方法が好ましい。中でも、伸縮性、寸法安定性、耐光性に優れたポリトリメチレンテレフタレート(以下、PTTと略称する。)が好適である。
【0013】
なお、本発明の効果を損なわない限り、少量の共重合成分が含有されていても特に問題はなく、共重合成分としては、5−ナトリウムスルホイソフタル酸、イソフタル酸、無水フタル酸、ナフタレンジカルボン酸等の芳香族ジカルボン酸成分、アジピン酸、セバシン酸、アゼライン酸等の脂肪族ジカルボン酸成分、4−ヒドロキシ安息香酸、ε−カプロラクトン等のヒドロキシカルボン酸成分、エチレングリコール、1,4ブタンジオール、1,4−シクロヘキサンジメタノール、2,2−ビス{4−(β−ヒドロキシ)フェニル}プロパンのエチレンオキシド付加体等のジオール成分等が挙げられる。
【0014】
さらに、本発明の複合繊維は、沸水で糸条を収縮処理したときの捲縮率が30%以上である必要がある。捲縮率が30%より低いと、この繊維から得られる織編物のストレッチ性が乏しくなり、ストレッチ性織編物用には適さない。捲縮率を30%以上にする方法としては、両ポリエステル間の極限粘度差を調整する方法が好ましい。そして、複合繊維の捲縮率を30%以上にするためには、低極限粘度側に0.6〜1.10の極限粘度を有するポリエステル、高極限粘度側に0.7〜1.30の極限粘度を有するポリエステルを使用し、両ポリエステル間の極限粘度差が0.1以上となるように組み合わせることが好ましい。
【0015】
本発明の複合繊維中には、本発明の効果を損なわない限り、必要に応じて酸化チタンなどの艶消し剤、ヒンダ−トフェノ−ル系化合物等の酸化防止剤、紫外線吸収剤、光安定剤、顔料、難燃剤、抗菌剤、導電性付与剤等を配合してもよい。
【0016】
次に、本発明の複合繊維の製法例について説明する。
まず、複合紡糸装置を用いて、互いに異なる極限粘度の2種類のポリエステルを溶融して別々の計量孔で計量し、口金背面でサイドバイサイド型になるように合流させ、紡糸温度240〜290℃で同一吐出孔から吐出させ、紡出糸条を冷却した後、油剤を付与して1000〜4000m/分の速度で引取り、捲取る。次いで、延撚機を用いて延伸熱処理を行い、本発明の複合繊維を得る。
【0017】
【実施例】
次に、本発明を実施例によって具体的に説明するが、本発明は、これらの実施例に限定されるものではない。
なお、実施例における測定方法および評価方法は次の通りである。
(1) 極限粘度〔η〕
フェノ−ルと四塩化エタンの等量混合物を溶媒とし、温度25℃で測定した。
(2) 捲縮率
得られた複合繊維マルチフィラメントを外周1.125mの検尺機で5回かせ取りして2重にし、1/6000g/Dの荷重をかけて30分間放置する。次いで、荷重をかけたままの状態で30分間沸水処理し、処理後の試料を30分間乾燥する。乾燥した試料に1/500g/Dの荷重をかけ、長さAを測定する。次いで、1/500g/Dの荷重を外し、1/20g/Dの荷重をかけて長さBを測定し,次式で算出する。
捲縮率(%)=〔(B−A)/B〕×100
(3) 紡糸操業性評価
16錘で24時間の紡糸を行った時の切糸回数で評価し、○及び△を合格基準とした。
0回:○ 、 1〜2回:△ 、 3回以上:×
(4) ストレッチ性と風合の評価
経糸に50デニール/24フィラメントのポリエチレンテレフタレート(以下、PETと略称する。)延伸糸を用い、緯糸に得られた複合繊維を用いて平織り組織にて製織し、この生機を精練した後、100℃の沸水中で30分間処理し、次いで風乾して得た布帛について、10人のパネラーによる官能評価を実施した。緯方向に引っ張った時にストレッチ性を有し、かつ、嵩高性があるソフトな風合であると判断した人数で評価を行い、○及び△を合格基準とした。
9人以上:○ 、 7〜8人:△ 、 6人以下:×
(5) 総合評価
上記した各評価項目を考慮して総合的に○、△、×で評価し、○及び△を合格基準とした。
【0018】
実施例1
酸化チタンを0.4重量%含有し、極限粘度が1.01の高粘度側PTT(A)と、酸化チタンを0.4重量%含有し、極限粘度が0.78の低粘度側PTT(B)を夫々溶融し、24孔で孔径0.6mmの丸断面形状孔を有する同一紡糸口金から繊維横断面のPTT(A)と(B)の容積比が1:1になるように吐出比を調整して260℃の紡糸温度で紡出した。
【0019】
次いで、紡出糸条を空気流で冷却固化した後、0.7重量%の油剤を付与し、糸条を2分割して2800m/分の速度で引き取り、82.5デニ−ルのサイドバイサイド型の半未延伸糸を得た。なお、この時の吐出量は、延伸後の繊度が50デニ−ルになるように調整した。
次いで、得られた半未延伸糸を70℃で1.65倍に延伸した後、160℃のホットプレ−ト上で熱処理を行い、50デニ−ル/12フィラメントの複合繊維を得た。
【0020】
実施例2〜3、比較例1〜2
繊維横断面におけるde/cdを変更するために、表1で示したようにPTT(B)の極限粘度を変更した以外は、実施例1と同様にして複合繊維を製造した。
【0021】
比較例3
de/cdを変更するために、PTT(A)に第3成分として2,2−ビス{4−(β−ヒドロキシ)フェニル}プロパンのエチレンオキシド付加体を実施例4は5モル%、比較例3は2モル%共重合し、PTT(B)との間に表1で示したような極限粘度差を付けた以外は、実施例1と同様にして複合繊維マルチフィラメントを製造した。
【0022】
比較例4
酸化チタンを0.4重量%含有し、極限粘度が0.67の高粘度側PET(A)と、酸化チタンを0.4重量%含有し、極限粘度が0.46の低粘度側PTT(B)を夫々溶融し、24孔で孔径0.8mmの丸断面形状孔を有する同一紡糸口金から繊維横断面のPET(A)と(B)の容積比が1:1になるように吐出比を調整して295℃の紡糸温度で紡出した。
【0023】
次いで、紡出糸条を空気流で冷却固化した後、0.7重量%の油剤を付与し、糸条を2分割して3300m/分の速度で引き取り、75デニ−ルのサイドバイサイド型の半未延伸糸を得た。なお、この時の吐出量は、延伸後の繊度が50デニ−ルになるように調整した。さらに、得られた半未延伸糸を70℃で1.5倍に延伸し、次いで150℃のホットプレ−ト上で熱処理を行い、50デニ−ル/12フィラメントの複合繊維を得た。実施例1〜及び比較例1〜4で得られた複合繊維マルチフィラメントの評価結果を併せて表1に示す。
【0024】
【表1】
【0025】
表1から明らかなように、実施例1〜で得られた複合繊維マルチフィラメントは、紡糸時の切糸が少なく、これらの複合繊維マルチフィラメントを緯糸に配した熱処理後の織物は、緯方向にストレッチ性を有した嵩高性のあるソフトな風合であった。また、ストレッチ性の指標とした捲縮率も30%以上であり、さらには、ソフト感の指標としたヤング率も40g/D以下であり、布帛の官能評価との相関性が非常に大きいものであった。
【0026】
一方、比較例1は、両ポリエステルの極限粘度差が大きすぎるため、溶融紡糸時に吐出糸条が屈曲して口金面に付着し、紡糸が不可能であった。また、比較例2は、de/cdが小さすぎるために捲縮の3次元クリンプ形態が小さくなり、織物に嵩高性が欠けており、捲縮率も低い値であった。次に、比較例3は、PTT(A)に第3成分を共重合しているために捲縮率は適当な値であったが、de/cdが小さすぎるために捲縮の形態が小さくなり、織物に嵩高性が欠けていた。さらに、比較例4は、PETを用いているために織物の風合いが硬く、ソフト感のある織物は得られなかった。また、ヤング率も40g/Dよりも高い値であった。
【0027】
【発明の効果】
本発明によれば、製編織すれば、嵩高性に富み、従来にないソフトな風合を有するストレッチ性織編物となるストレッチ性織編物用ポリエステル複合繊維が提供される。
【図面の簡単な説明】
【図1】本発明のストレッチ性織編物用ポリエステル複合繊維の一実施態様を示す横断面図である。
【符号の説明】
a 両ポリエステル接合面と繊維外周との接点。
b 両ポリエステル接合面と繊維外周との接点。
X 線分abの中心を通り、線分abに直交する直線。
c 直線Xと高粘度側ポリエステルの繊維外周との交点。
d 直線Xと両ポリエステル接合面との交点。
e 線分abと直線Xとの交点。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyester composite fiber for stretch woven or knitted fabric that is rich in bulk and has an unprecedented soft texture.
[0002]
[Prior art]
In order to obtain a woven or knitted fabric having a stretch function, it is well known to use a latent crimpable conjugate fiber obtained by joining two kinds of polyesters having different intrinsic viscosities in a side-by-side manner. When this latent crimpable composite fiber is crimped in the state of a yarn or a woven or knitted fabric to develop a crimp and used as a woven or knitted fabric having stretch performance, a three-dimensional crimp form of the yarn The crimp performance greatly affects the stretch performance of the fabric.
[0003]
Conventionally, in order to obtain such a latently crimpable polyester composite fiber, the difference in intrinsic viscosity between the two polyesters has been increased as much as possible, and the difference in shrinkage when made into fibers has been increased. In order to improve, efforts have been made to straighten the joint surfaces of both polyesters in the fiber cross section, and various proposals have been made for these composite fibers.
[0004]
For example, when the difference in intrinsic viscosity between two types of polyester is large, the discharge yarn is bent during melt spinning. Further, when the intrinsic viscosity difference is further increased, the bending proceeds excessively, and the yarn adheres to the spinneret, resulting in cutting, and stable spinning cannot be performed. Accordingly, in a die in which polymers having different viscosities are discharged from a pair of discharge holes to form a side-by-side type composite fiber, each pair of discharge holes is inclined with respect to a direction perpendicular to the die surface. There has been proposed a melt spinning die (Japanese Patent Publication No. 61-60163) in which the angle, the distance between a pair of discharge holes, and the like are regulated.
[0005]
When spinning is performed using this melt spinning die, the joint surfaces of the two types of polyester in the fiber cross section become linear. In this case, even if the intrinsic viscosity difference between the two types of polyester is large, the spinning operability is good, but since the joint surface of the two types of polyester is linear, the three-dimensional crimp form of the crimps that are manifested is small, There was a problem that crimps per unit length were developed so much that jamming occurred between single yarns, resulting in a flat texture lacking in bulkiness when formed into a woven or knitted fabric.
[0006]
[Problems to be solved by the invention]
The present invention provides a polyester composite fiber for stretchable woven and knitted fabrics, which has a high bulkiness and becomes a stretchable woven or knitted fabric having an unprecedented soft texture if the above problems are solved and knitted or woven. This is a typical issue.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have curved the joint surface shape of both polyesters in the fiber cross section within a specific range, and the Young's modulus of the yarn is within a specific range. It has been found that a polyester composite fiber capable of simultaneously imparting bulkiness, unprecedented soft texture, and stretchability to a fabric obtained by weaving and knitting has been achieved. .
[0008]
That is, in the present invention, polytrimethylene terephthalate having a repeating unit of trimethylene terephthalate of 85% or more is used as two types of polyesters having different intrinsic viscosities, and the two types of polyesters are combined in a side-by-side manner, and the cross section of the fiber It is a fiber in which the joint surface shape of both polyesters is curved, the intrinsic viscosity of low intrinsic viscosity polyester is 0.6 to 1.10, the intrinsic viscosity of high intrinsic viscosity polyester is 0.7 to 1.30, and between both polyesters The linear viscosity X of the high-viscosity polyester and the straight line X passing through the center of the line segment ab connecting the two contact points a and b between the joint surface and the fiber outer periphery is set to 0.1 or more. When the intersection point with the outer circumference is c, the intersection point with the joint surface is d, and the intersection point between the line segment cd and the line segment ab is e, the ratio de / cd of the length between the line segment de and the line segment cd A gist is a polyester composite fiber for stretchable woven or knitted fabric, which satisfies the following formula (1), has a Young's modulus of yarn of 40 g / D or less, and a crimp rate of 30% or more. is there.
0.05 ≦ de / cd ≦ 0.80 (1)
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0010]
The composite fiber of the present invention is a fiber in which two types of polyesters having different intrinsic viscosities are bonded to each other in a side-by-side manner, and the bonding surface shape of the two types of polyesters in the fiber cross section needs to be curved. . If the joint surfaces of two types of polyester in the fiber cross-section are linear, the three-dimensional crimp form of crimps generated by the shrinkage treatment becomes small, and very many crimps appear per unit length. A jam occurs between the yarns. For this reason, the bulkiness of the woven or knitted fabric is lowered.
[0011]
FIG. 1 is a cross-sectional view showing one embodiment of the conjugate fiber of the present invention. In FIG. 1, the intersection of the straight line X passing through the center of the line segment ab connecting the two contact points a and b of both polyesters and the fiber outer periphery and orthogonal to the line segment ab and the fiber outer periphery of the high-viscosity polyester. C, the intersection with the joint surface is d, and the intersection between the line segment cd and the line segment ab is e. In the conjugate fiber of the present invention, the ratio of the lengths of the line segment de and the line segment cd (hereinafter referred to as de / cd) needs to be 0.05 to 0.80 as in the formula (1). When this ratio is less than 0.05, the joint surfaces of both polyesters in the fiber cross section become linear, and the bulkiness of the woven or knitted fabric becomes low. On the other hand, if this ratio exceeds 0.80, the three-dimensional crimp form of crimps developed by the shrinkage treatment becomes large. In order to make this ratio exceed 0.80, the intrinsic viscosity difference between the two polyesters. Therefore, there is a problem that the discharged yarn is bent and adheres to the die surface during melt spinning, and thus the yarn is cut and stable spinning cannot be performed.
[0012]
In the conjugate fiber of the present invention, the yarn Young's modulus needs to be 40 g / D or less. When the Young's modulus of the yarn is greater than 40 g / D, the texture of the woven or knitted fabric becomes stiff and lacks a soft feeling. A method for setting the Young's modulus to 40 g / D or less is not particularly limited. For example, a method in which the yarn is composed of a polyester having a relatively flexible structure is preferable. Among these, polytrimethylene terephthalate (hereinafter abbreviated as PTT) excellent in stretchability, dimensional stability, and light resistance is preferable.
[0013]
In addition, as long as the effects of the present invention are not impaired, there is no particular problem even if a small amount of a copolymer component is contained. Examples of the copolymer component include 5-sodium sulfoisophthalic acid, isophthalic acid, phthalic anhydride, and naphthalenedicarboxylic acid. Aromatic dicarboxylic acid components such as adipic acid, sebacic acid and azelaic acid, hydroxycarboxylic acid components such as 4-hydroxybenzoic acid and ε-caprolactone, ethylene glycol, 1,4 butanediol, 1 Diol components such as ethylene oxide adducts of 1,2-cyclohexanedimethanol and 2,2-bis {4- (β-hydroxy) phenyl} propane.
[0014]
Further, the conjugate fiber of the present invention needs to have a crimp rate of 30% or more when the yarn is contracted with boiling water. If the crimping ratio is lower than 30%, the stretchability of the woven or knitted fabric obtained from this fiber becomes poor, and it is not suitable for a stretchable woven or knitted fabric. As a method of setting the crimp rate to 30% or more, a method of adjusting the intrinsic viscosity difference between the two polyesters is preferable. And in order to make the crimp rate of the composite fiber 30% or more, polyester having an intrinsic viscosity of 0.6 to 1.10 on the low intrinsic viscosity side, 0.7 to 1.30 on the high intrinsic viscosity side It is preferable to use polyester having intrinsic viscosity and combine them so that the difference in intrinsic viscosity between the two polyesters is 0.1 or more.
[0015]
In the composite fiber of the present invention, a matting agent such as titanium oxide, an antioxidant such as a hindered phenol compound, an ultraviolet absorber, and a light stabilizer, as necessary, unless the effects of the present invention are impaired. , Pigments, flame retardants, antibacterial agents, conductivity-imparting agents, and the like.
[0016]
Next, the example of the manufacturing method of the composite fiber of this invention is demonstrated.
First, two types of polyesters with different intrinsic viscosities are melted using a composite spinning device, weighed in separate metering holes, merged into a side-by-side type on the back of the die, and the same at a spinning temperature of 240 to 290 ° C. After discharging from the discharge hole and cooling the spun yarn, an oil agent is applied and taken up at a speed of 1000 to 4000 m / min and wound. Next, a drawing heat treatment is performed using a twisting machine to obtain the conjugate fiber of the present invention.
[0017]
【Example】
EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.
In addition, the measuring method and evaluation method in an Example are as follows.
(1) Intrinsic viscosity (η)
The measurement was carried out at a temperature of 25 ° C. using a mixture of equal amounts of phenol and ethane tetrachloride as a solvent.
(2) Crimp rate The obtained composite fiber multifilament is scraped five times with a measuring machine having an outer circumference of 1.125 m, and doubled, and left for 30 minutes under a load of 1/6000 g / D. Next, boiling water treatment is performed for 30 minutes while the load is applied, and the treated sample is dried for 30 minutes. A load of 1/500 g / D is applied to the dried sample, and the length A is measured. Next, the load of 1/500 g / D is removed, the length B is measured with a load of 1/20 g / D, and the following formula is calculated.
Crimp rate (%) = [(B−A) / B] × 100
(3) Evaluation of spinning operability Evaluated by the number of cuts when spinning for 24 hours with 16 spindles, and ○ and Δ were accepted criteria.
0 times: ○, 1-2 times: △, 3 times or more: ×
(4) Evaluation of stretchability and texture Using 50 denier / 24 filament polyethylene terephthalate (hereinafter abbreviated as PET) drawn warp and weaving in a plain weave structure using the composite fiber obtained as weft. The fabric was scoured, treated in boiling water at 100 ° C. for 30 minutes, and then air-dried, and sensory evaluation was conducted by 10 panelists. Evaluation was performed with the number of persons judged to have a soft texture with stretchability when pulled in the weft direction, and ○ and Δ were used as acceptance criteria.
9 or more: ○, 7-8: △, 6 or less: ×
(5) Comprehensive evaluation In consideration of each evaluation item described above, the evaluation was comprehensively made with ◯, △, and ×, and ○ and △ were used as acceptance criteria.
[0018]
Example 1
High viscosity side PTT (A) containing 0.4% by weight of titanium oxide and having an intrinsic viscosity of 1.01, and low viscosity side PTT containing 0.4% by weight of titanium oxide and having an intrinsic viscosity of 0.78 (A) B) is melted and discharged from the same spinneret having a round cross-sectional shape hole with a hole diameter of 0.6 mm so that the volume ratio of PTT (A) and (B) in the cross section of the fiber is 1: 1. Was adjusted and spinning was performed at a spinning temperature of 260 ° C.
[0019]
Next, after the spinning yarn is cooled and solidified with an air flow, 0.7% by weight of an oil agent is applied, the yarn is divided into two and taken up at a speed of 2800 m / min, and a side-by-side type of 82.5 denier. Of semi-undrawn yarn was obtained. The discharge rate at this time was adjusted so that the fineness after stretching would be 50 denier.
Next, the obtained semi-undrawn yarn was drawn 1.65 times at 70 ° C. and then heat-treated on a hot plate at 160 ° C. to obtain a 50 denier / 12 filament composite fiber.
[0020]
Examples 2-3 and Comparative Examples 1-2
A composite fiber was produced in the same manner as in Example 1 except that the intrinsic viscosity of PTT (B) was changed as shown in Table 1 in order to change de / cd in the fiber cross section.
[0021]
Comparative Example 3
In order to change de / cd, ethylene oxide adduct of 2,2-bis {4- (β-hydroxy) phenyl} propane as the third component was added to PTT (A) as the third component. A bicomponent multifilament was produced in the same manner as in Example 1 except that 2 mol% was copolymerized and the intrinsic viscosity difference shown in Table 1 was added to PTT (B).
[0022]
Comparative Example 4
High viscosity side PET (A) containing 0.4% by weight of titanium oxide and having an intrinsic viscosity of 0.67, and low viscosity side PTT containing 0.4% by weight of titanium oxide and having an intrinsic viscosity of 0.46 ( B) is melted, and the discharge ratio is such that the volume ratio of PET (A) and (B) in the cross section of the fiber is 1: 1 from the same spinneret having 24 holes and a round sectional shape hole of 0.8 mm in diameter. Was adjusted and spinning was performed at a spinning temperature of 295 ° C.
[0023]
Next, after spinning and solidifying the spun yarn with an air flow, 0.7% by weight of an oil agent is applied, and the yarn is divided into two parts and taken up at a speed of 3300 m / min. An undrawn yarn was obtained. The discharge rate at this time was adjusted so that the fineness after stretching would be 50 denier. Further, the obtained semi-undrawn yarn was drawn 1.5 times at 70 ° C. and then heat-treated on a hot plate at 150 ° C. to obtain a 50 denier / 12 filament composite fiber. The evaluation results of the composite fiber multifilaments obtained in Examples 1 to 3 and Comparative Examples 1 to 4 are also shown in Table 1.
[0024]
[Table 1]
[0025]
As is apparent from Table 1, the composite fiber multifilaments obtained in Examples 1 to 3 have few cut yarns during spinning, and the fabric after heat treatment in which these composite fiber multifilaments are arranged on the wefts is in the weft direction. It was a soft texture with bulkiness and stretchability. In addition, the crimp rate as an index of stretchability is 30% or more, and the Young's modulus as an index of softness is 40 g / D or less, which has a very large correlation with the sensory evaluation of the fabric. Met.
[0026]
On the other hand, in Comparative Example 1, since the difference in intrinsic viscosity between the two polyesters was too large, the discharged yarn was bent and adhered to the die surface during melt spinning, and spinning was impossible. In Comparative Example 2, since the de / cd was too small, the crimped three-dimensional crimp form was small, the fabric lacked bulkiness, and the crimp rate was also low. Next, in Comparative Example 3, the third component was copolymerized with PTT (A), so the crimp rate was an appropriate value. However, since de / cd was too small, the crimped form was small. As a result, the woven fabric lacked bulkiness. Furthermore, in Comparative Example 4, since the use of PET, the texture of the fabric was hard, and a fabric with a soft feeling could not be obtained. The Young's modulus was also higher than 40 g / D.
[0027]
【The invention's effect】
According to the present invention, there is provided a polyester composite fiber for stretchable woven or knitted fabric that becomes a stretchable woven or knitted fabric that is rich in bulk and has an unprecedented soft texture when knitted or woven.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of a polyester conjugate fiber for stretchable woven or knitted fabric of the present invention.
[Explanation of symbols]
a Contact point between both polyester joint surfaces and fiber outer periphery.
b Contact points between both polyester joint surfaces and the outer periphery of the fiber.
X A straight line passing through the center of the line segment ab and orthogonal to the line segment ab.
c Intersection of the straight line X and the fiber outer periphery of the high viscosity polyester.
d Intersection of straight line X and both polyester joint surfaces.
e Intersection of line segment ab and straight line X.

Claims (1)

  1. 極限粘度の異なる2種類のポリエステルとして、トリメチレンテレフタレートの繰り返し単位が85%以上のポリトリメチレンテレフタレートを用い、2種類のポリエステルが互いにサイドバイサイド型に複合され、繊維横断面の両ポリエステルの接合面形状が湾曲している繊維であり、低極限粘度ポリエステルの極限粘度を0.6〜1.10、高極限粘度ポリエステルの極限粘度を0.7〜1.30、両ポリエステル間の極限粘度差を0.1以上とし、接合面と繊維外周との2つの接点a、bを結んだ線分abの中心を通り、線分abと直交した直線Xと高粘度側ポリエステルの繊維外周との交点をc、接合面との交点をd、線分cdと線分abとの交点をeとしたとき、線分deと線分cdとの長さの比de/cdが下記式(1)を満足し、かつ、糸条のヤング率が40g/D以下、捲縮率が30%以上であることを特徴とするストレッチ性織編物用ポリエステル複合繊維。
    0.05≦de/cd≦0.80 (1)
    Polytrimethylene terephthalate with 85% or more of repeating units of trimethylene terephthalate is used as two types of polyesters with different intrinsic viscosities. Is a curved fiber, the intrinsic viscosity of the low intrinsic viscosity polyester is 0.6 to 1.10, the intrinsic viscosity of the high intrinsic viscosity polyester is 0.7 to 1.30, and the intrinsic viscosity difference between the two polyesters is 0. and .1 least two contact points a of the joining surface and the fiber outer circumference through the center of the connecting b segment ab, the intersection of the fiber outer circumference of the straight line X and the high viscosity side polyester orthogonal to the line segment ab c When the intersection with the joint surface is d and the intersection between the line segment cd and the line segment ab is e, the length ratio de / cd of the line segment de and the line segment cd satisfies the following formula (1). And the Young's modulus of the yarn is 40 g / D or less, stretch woven or knitted fabric for polyester composite fiber characterized by crimp is 30% or more.
    0.05 ≦ de / cd ≦ 0.80 (1)
JP04153499A 1999-02-19 1999-02-19 Polyester composite fiber for stretch woven and knitted fabric Expired - Lifetime JP4115029B2 (en)

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JP2002129433A (en) * 2000-10-17 2002-05-09 Toray Ind Inc Highly strechable polyester-based conjugated fiber
JP3692931B2 (en) * 2000-12-11 2005-09-07 東レ株式会社 POLYESTER SHORT FIBER HAVING LATIN CRIMMING CHARACTERISTICS AND PROCESS FOR PRODUCING THE SAME
JP4710141B2 (en) * 2001-01-24 2011-06-29 東レ株式会社 Polyester composite yarn for high stretch woven and knitted fabric
ES2258614T3 (en) 2001-02-02 2006-09-01 Asahi Kasei Kabushiki Kaisha COMPLEX FIBER WITH EXCELLENT CAPACITY OF BACK PROCESS AND MANUFACTURING METHOD OF THE SAME.
JP2002242037A (en) * 2001-02-19 2002-08-28 Asahi Kasei Corp Composite yarn
EP1394296B1 (en) 2001-04-17 2011-01-12 Teijin Fibers Limited False twist yarn of polyester composite fiber and method for production thereof
KR100552026B1 (en) * 2001-07-04 2006-02-17 아사히 가세이 셍이 가부시키가이샤 Warp Knitted Fabric
JP3827672B2 (en) 2001-09-18 2006-09-27 旭化成せんい株式会社 Polyester-based composite fiber pan
EP1443009B1 (en) * 2001-11-06 2008-12-10 Asahi Kasei Fibers Corporation Polyester composite fiber package
KR100481296B1 (en) * 2002-05-27 2005-04-07 주식회사 휴비스 Polytrimethyleneterephtalate conjugated fiber and preparation thereof
US6846560B2 (en) 2002-05-27 2005-01-25 Asahi Kasei Kabushiki Kaisha Conjugate fiber and method of producing same
US6641916B1 (en) 2002-11-05 2003-11-04 E. I. Du Pont De Nemours And Company Poly(trimethylene terephthalate) bicomponent fibers
EP1576211B1 (en) 2002-12-23 2016-05-25 E. I. du Pont de Nemours and Company Poly(trimethylene terephthalate) bicomponent fiber process
JP2006183163A (en) * 2004-12-27 2006-07-13 Teijin Fibers Ltd Polyester latently crimpable conjugated fiber

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