JP2004052194A - Conjugated fiber and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dissolve defects on surface quality such as willow like wrinkles, bright specs, puckering, etc., caused by heat-treating on using a PTT-based composite fiber as a liner fabric having relatively small texture-restraining force. <P>SOLUTION: This polytrimethylene terephthalate-based conjugated fiber is characterized by comprising a group of single fibers obtained by joining two polyester components side by side or as an eccentric sheath core type and having a polytrimethylene terephthalate as at least one component constituting the single fiber, and satisfying the following (1) to (5) requisites. (1) The elongation rate of apparent crimps before boiling water treatment is ≤20 %. (2) Elongation rate measured after the boiling water treatment by loading 3.5×10<SP>-3</SP>cN/dtex is 2-10 %. (3) Dry heat contraction stress value is 0.05-0.24 cN/dtex. (4) Breaking elongation is 30-45 %. (5) Stress values in 10 % elongation in elongation/stress measurements exhibit ≤0.03 cN/dtex difference between the maximum and minimum values along the longitudinal direction of the fiber. <P>COPYRIGHT: (C)2004,JPO

Description

【００５１】

【００５２】
【表１】

表１からも明らかなように、２つの成分間の極限粘度差が本発明の範囲であれば、織物は良好なストレッチ性とストレッチ回復性を示す。
【００５３】
【実施例５〜７、比較例２〜３】
本実施例では、ＰＴＴ系複合繊維の破断伸度及び顕在している捲縮の伸縮伸長率Ｖ_Ｃ及び、負荷時伸縮伸長率ＣＥ_３．５効果について、説明する。
実施例２に示す固有粘度の組み合わせで、１ゴデットロールと２ゴデットロール間の速度比、即ち延伸倍率を表２に示すように異ならせて複合繊維を得た。
得られた複合繊維及び織物の物性を、表２に示す。
【００５４】
【表２】

表２から明らかなように、複合繊維の破断伸度及び顕在している捲縮の伸縮伸長率及び、負荷時伸縮伸長率が本発明の範囲であれば、良好な紡糸安定性及び織物品位を示す。
比較例３に示すように、破断伸度が本発明外であれば、紡糸時に糸切れが生じ、工業的な生産が困難であった。
【００５５】
【実施例８〜１０、比較例４〜５】
本実施例においては、乾熱収縮応力及び破断伸度の効果について説明する。
実施例２と同様に直接紡糸延伸を行うにおいて、第２ゴデットロールと第３ゴデットロール間の熱処理張力を表３に示すように異ならせた。
得られた複合繊維及び織物の物性を、表３に示す。
【００５６】
【表３】

表３から明らかなように、複合繊維の乾熱収縮応力及び破断伸度が本発明の範囲であれば、良好な紡糸性と織物品位を有していた。
【００５７】
【実施例１１〜１３、比較例６】
本実施例では、紡糸速度及び巻取速度の好ましい態様について説明する。
実施例２に示す固有粘度の組み合わせにおいて、第１ゴデットロールの速度、即ち紡糸速度及び巻取速度を表４に示すように異ならせて、複合繊維を得た。
得られた複合繊維の物性を、表４に示す。
【００５８】
【表４】

表４から明らかなように、紡糸速度が１５００ｍ／分以上であれば、加工糸の染め品位が良好であった。
【００５９】
【実施例１４〜１６、比較例７】
本実施例では、複合繊維の製造に用いるポリマー種類の効果について、説明する。
２つのポリマーの組み合わせを表５に示す以外は、実施例２に示す紡糸，延伸条件で複合繊維を得た。
得られた、複合繊維及び織物の物性を表５に示す。
【００６０】
【表５】

表５から明らかなように、少なくとも一方にＰＴＴを用いた複合繊維は、良好な織物品位とストレッチ性とストレッチ回復性を有していた。
比較例７は、ＰＴＴを含まないために、ストレッチ性に欠けていた。
【００６１】
【実施例１７〜２０、比較例８〜１０】
本実施例では、紡糸に用いる紡口の孔の効果について説明する。
実施例２と同様に直接紡糸延伸を行うにあたり、吐出孔径及び傾斜角度を、表６に異ならせた紡口を用いて紡糸を行った。
紡糸性及び得られた織物の品位を、表６に示す。
【００６２】
【表６】

表６より明らかなように、本発明の製造方法に示す紡口を用いた場合には、良好な紡糸性と、織物品位が得られた。
【００６３】
【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系複合繊維および、それを直接紡糸延伸法で安価に製造する製造法を提供することができる。
【図面の簡単な説明】
【図１】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２】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：非送風領域
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[Claims]
1. The method of claim 1, wherein the two polyester components are of a side-by-side type, orEccentric sheath core typeA polytrimethylene terephthalate composite, wherein at least one component constituting the single yarn is polytrimethylene terephthalate, which satisfies the following requirements (1) to (5): fiber.
(1) The stretching and elongation percentage of the crimps that are apparent before the boiling water treatment is 20% or less.
(2) 3.5 × 10^-3Stretch elongation measured after applying a load of cN / dtex and performing boiling water treatment is 2 to 10%
(3) Dry heat shrinkage stress value is 0.05 to 0.24 cN / dtex
(4) Elongation at break is 30 to 45%
(5) Elongation—The stress value at 10% elongation in the stress measurement is such that the difference between the maximum and minimum along the yarn length direction is 0.30 cN / dtex or less.
2. The polytrimethylene terephthalate-based conjugate fiber according to claim 1, wherein the dry heat shrinkage stress value of the conjugate fiber is 0.05 to 0.15 cN / dtex.
3. The polytrimethylene terephthalate-based composite fiber according to claim 1, wherein both components constituting the single yarn are polytrimethylene terephthalate.
4. The method of claim 1, wherein the two polyester components are of a side-by-side type, orEccentric sheath core typeWhen producing a conjugate fiber comprising a single yarn group bonded to at least one component of which is a polytrimethylene terephthalate, the following requirements (A) to (D) are satisfied. For producing polytrimethylene terephthalate-based composite fibers.
(A) Melting when the intrinsic viscosity difference between the two polyester components is 0.05 to 0.9
And
(B) The ratio of the discharge hole diameter to the hole length after the two polyester components have joined is 2 or more.
Above, a spinning hole in which the discharge hole has an inclination of 10 to 40 degrees with respect to the vertical direction.
After discharging, cooling, after stretching without winding once,
(C) 0.05-0.25 cN / dtex between the second roll and the third roll
Heat treatment with tension,
(D) Winding at a winding speed of 4000 m / min or less.
DETAILED DESCRIPTION OF THE INVENTION
[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a polytrimethylene terephthalate-based composite fiber suitable for lining fabric use and a method for producing the same. More specifically, it is a polytrimethylene terephthalate-based composite fiber obtained by a direct spinning drawing method, and when used for a lining fabric, has a soft texture without generating defects such as wrinkles, sinkers, sinkers, and puckering. The present invention relates to a polytrimethylene terephthalate-based composite fiber exhibiting excellent stretch characteristics and excellent surface quality, and a method for industrially stably producing the same.
[0002]
[Prior art]
In recent years, among knitted fabrics, a stretch knitted fabric having a stretch property has 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-based fibers are difficult to dye with polyester-based dyes, which causes problems such as complicating the dyeing process, embrittlement during long-term use, and deteriorating 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, a large number of 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]
As prior art relating thereto, JP-B-43-19108, JP-A-2000-239927, JP-A-2000-256918, JP-A-2001-55634, JP-A-2001-131287, and European Patent ( EP) 1059372, US Pat. No. 6,306,499, JP-A-2001-40537, JP-A-2002-61031, JP-A-2002-54029, and the like. These include 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 fibers (hereinafter, both types). And 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.
[0004]
JP-A-2001-131387, JP-A-2001-348734, and JP-A-2002-61030 disclose so-called direct spinning and stretching in which spinning and stretching are continuously performed in producing these PTT-based composite fibers. A law has been proposed. In particular, Japanese Patent Application Laid-Open No. 2001-13187 discloses that by setting the heat shrinkage stress value to 0.25 cN / dtex or more, 3.5 × 10 3^-3A PTT-based composite fiber having a crimp elongation of 10% or more even under a load of cN / dtex is disclosed.
It is disclosed that this composite fiber exhibits high crimpability when used in a woven fabric having a strong twist or a large tissue binding force.
[0005]
However, use of a low twist number of no twist to 1000 turns / m or less, or winding of a fabric having a relatively small tissue binding force such as a lining, having a large heat shrinkage stress value as disclosed in the publication, It has been found that the use of the crimped yarn causes wrinkles in the woven fabric to be produced, which impair the commercial value.
According to our study, it was found that the cause of the wrinkles in the lining fabric was the imbalance between the warp binding force and the weft shrinkage force.
That is, a weft having a high contraction force is applied to a structure having a relatively weak warp binding force, such as a lining fabric, in which the number of warp yarns is about 120 / 2.54 cm or less and the cover factor is about 2000 or less. It is presumed that when combined, the arrangement of the warp yarns will be broken, resulting in wrinkles of Yangyang style.
[0006]
Furthermore, the crimp of the highly crimped conjugate fiber disclosed in this publication is apparent even before the heat treatment. It has been clarified that such an apparent crimp receives an elongation stress during weaving, so that the crimp elongates irregularly, causing sink marks and puckering on the surface of the woven product, thereby deteriorating the quality of the woven fabric.
Accordingly, there has been a strong demand for the appearance of PTT-based composite fibers which are used in lining fabrics and have no defects such as wrinkles, shrinkage and puckering, and exhibit good surface quality and excellent stretchability.
[0007]
[Problems to be solved by the invention]
It is an object of the present invention to eliminate wrinkles and surface quality defects caused by heat treatment in a lining fabric having a relatively small tissue binding force.
An object of the present invention is to provide a PTT-based conjugate fiber which is optimal for a lining fabric having a good surface quality and an appropriate stretch property, and a production method for producing the PTT-based conjugate fiber at low cost by a direct spin drawing method.
[0008]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, when manufacturing PTT-based composite fibers by a direct spinning drawing method, by specifying the physical properties and heat shrinkage properties of the PTT-based composite fibers, the above-mentioned problems were solved. The inventors have found that the problem is solved, and have completed the present invention.
That is, the first invention of the present invention comprises 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. A polytrimethylene terephthalate-based composite fiber, which is terephthalate and satisfies the following requirements (1) to (5).
(1) The stretching and elongation percentage of the crimps that are apparent before the boiling water treatment is 20% or less.
(2) 3.5 × 10^-3Stretch elongation measured after applying a load of cN / dtex and performing boiling water treatment is 2 to 10%
(3) Dry heat shrinkage stress value is 0.05 to 0.24 cN / dtex
(4) Elongation at break is 30 to 45%
(5) Elongation—The stress value at 10% elongation in the stress measurement is such that the difference between the maximum and minimum along the yarn length direction is 0.30 cN / dtex or less.
[0009]
The second invention of the present invention is directed to 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. Is a method for producing a polytrimethylene terephthalate-based composite fiber, which satisfies the following requirements (A) to (D) when producing the composite fiber.
(A) two polyester component intrinsic viscosity difference is melted at 0.05 to 0.9,
(B) The ratio of the discharge hole diameter to the hole length after the two polyester components have joined is 2 or more.
In this case, a spinning hole is used in which the discharge hole has an inclination of 10 to 40 degrees with respect to the vertical direction.
After discharging, cooling, and stretching without winding once,
(C) Between the second roll and the third roll, 0.10 to 0.25 cN / dtex
After heat treatment with tension of
(D) Winding at a winding speed of 4000 m / min or less.
[0010]
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.
[0011]
Representative examples of the copolymer component include the following.
Examples of the acidic component include aromatic dicarboxylic acids represented by isophthalic acid and 5-sodium sulfoisophthalic acid, and aliphatic dicarboxylic acids represented by adipic acid and itaconic acid. Examples of the glycol component include ethylene glycol, butylene glycol, polyethylene glycol, and the like. Hydroxycarboxylic acids such as hydroxybenzoic acid are also 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. Is used.
[0012]
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. This is 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.
[0013]
The PTT polymer used in the present invention has a trimethylene terephthalate cyclic dimer content of preferably 2.5% by weight or less, more preferably less than 1.1% by weight, and particularly preferably 1.0% by weight. It is as follows.
In the present invention, it is more 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.
[0014]
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.
Further, it is further preferable that the intrinsic viscosity difference between the two components at that time is 0.05 to 0.9 dl / g, and the average intrinsic viscosity is 0.8 to 1.2 dl / g.
[0015]
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 deteriorates. A more desirable compounding ratio is 45/55 to 65/35.
In the present invention, in the composite fiber composed of a single yarn group in which two polyester components are bonded in a side-by-side type, the curvature r (μm) of the bonding interface of the single yarn cross section is 10 d.^0.5It is preferably less than. Here, d indicates single yarn decitex. In the present invention, the curvature r is 4 to 9d.^0.5It is preferable that
[0016]
In the PTT-based conjugate fiber of the present invention, it is necessary that the expansion / contraction elongation (Vc) of the crimp that has become apparent before the boiling water treatment is 20% or less. If the expansion / contraction elongation of the crimp that has become apparent before the boiling water treatment exceeds 20%, unevenness in the elongation of the crimp occurs due to a slight change in tension during warping or weaving, and the surface quality of the woven fabric deteriorates. The smaller the apparent crimp, the better the fabric surface quality. The stretching and elongation percentage of the crimp that has become apparent before the boiling water treatment is preferably 10% or less, more preferably 5% or less.
The PTT-based composite fiber of the present invention is 3.5 × 10^-3Stretch elongation (CE) measured after boiling water treatment with a load of cN / dtex_3.5) Needs to be 2 to 10%. Stretch rate (CE_3.5When the content exceeds 10%, wool-like wrinkles are generated on the woven fabric surface, which impairs the commercial value. Stretch rate (CE_3.5) Is less than 2%, the stretch ratio of the lining fabric becomes small. Preferred stretch ratio (CE_3.5) Is 3 to 8%.
[0017]
The PTT-based conjugate fiber of the present invention needs to have a dry heat shrinkage stress value of 0.05 to 0.24 cN / dtex. When the dry heat shrinkage stress value exceeds 0.24 cN / dtex, the PTT-based composite fiber wound in the package shrinks with time to cause tightness, causing a change in the de-tacking tension, and causing the fabric to have a grain or Packing occurs and the quality deteriorates. 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. The preferred dry heat shrinkage stress value is 0.05 to 0.20 cN / dtex, more preferably 0.05 to 0.15 cN / dtex.
[0018]
The PTT-based conjugate fiber of the present invention needs to have a breaking elongation of 30 to 45%. If the elongation at break is less than 30%, industrially stable spinning 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. Preferred elongation at break is 35 to 45%.
In the PTT-based conjugate fiber of the present invention, the stress value at 10% elongation in the elongation-stress measurement of the conjugate fiber is the maximum and minimum difference along the yarn length direction (hereinafter referred to as 10% elongation stress value difference). Must be 0.30 cN / dtex or less. The stress value at 10% elongation in the elongation-stress measurement shows different values depending on the microstructure such as the degree of fiber orientation and crystallinity. In the present invention, it has been found that the variation in the stress value at 10% elongation corresponds well to the dyeing quality of the fabric. The smaller the variation in the yarn length direction, the better the uniformity of dyeing. If the difference between the maximum and the minimum in the yarn length direction of the 10% elongation stress exceeds 0.30 cN / dtex, the dyeing quality of the woven fabric becomes poor. The difference between the maximum and the minimum is preferably 0.20 cN / dtex or less. In addition, it is preferably 0 or more.
[0019]
The fineness and single yarn fineness of the PTT-based conjugate fiber of the present invention are not particularly limited, but a fineness of 20 to 300 dtex and a single yarn fineness of 0.5 to 20 dtex are used.
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-section, 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 copolymer.
[0020]
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 0.05 to 0.9 and melt-spun.
If the difference in intrinsic viscosity is less than 0.05, sufficient stretchability and recoverability cannot be obtained when fabric is used. 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 are not sufficiently eliminated, and the fineness variation of the PTT-based composite fiber is reduced. It is not preferable because it becomes large. A preferred intrinsic viscosity difference is 0.1 to 0.60 dl / g. When both components are PTT, the difference in intrinsic viscosity is preferably 0.1 to 0.4.
[0021]
The production method of the present invention can be produced by using a known multi-screw extruder having a twin-screw extruder other than the spinneret shown in FIG.
FIG. 1 is a schematic view of a spinneret suitable for the production of the present invention.
In FIG. 1, (a) is a distribution plate, and (b) is a spinneret. A and B polytrimethylene terephthalates having different intrinsic viscosities are supplied from the distribution plate (a) to the spinneret (b). After the two merge at the spout (b), the mixture is discharged from a discharge hole having an inclination of θ degrees with respect to the vertical direction. The diameter of the discharge hole is represented by D, and the hole length is represented by L. In the present invention, it is preferable that the ratio between the discharge hole diameter D and the hole length L is 2 or more.
[0022]
The ratio between the discharge hole diameter D and the hole length L is preferably 2 or more in order to stabilize the joining state of both components after two types of polyesters having different compositions or intrinsic viscosities have joined. If the ratio of the pore diameter to the pore length is less than 2, the bonding becomes unstable and fluctuations occur due to the difference in the melt viscosity of the polymer when discharged from the pores, so that the 10% elongation stress value difference can be maintained within the range of the present invention. It will be difficult.
The ratio of the discharge hole diameter to the hole length is preferably as large as possible, but is preferably 2 to 8 because the production of the holes becomes difficult. More preferably, it is 2.5-5.
The discharge hole of the spinneret used in the present invention needs to have an inclination of 10 to 40 degrees with respect to the vertical direction.
[0023]
In the present invention, spinning using holes inclined at a specific angle succeeded in maintaining the 10% elongation stress difference within the range of the present invention. Here, 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 an inclination, for example, as the intrinsic viscosity difference increases with the combination of PTTs, the filament immediately after ejection bends in the direction of higher intrinsic viscosity, that is, a so-called bending phenomenon occurs, and the filament elongates by 10%. Not only is it difficult to maintain the stress value difference within the range of the present invention, but also it is difficult to perform stable spinning. In FIG. 1, it is preferable to supply and discharge a PTT polymer having a high intrinsic viscosity to the A side and another polyester or PTT polymer having a low intrinsic viscosity to the B side.
[0024]
For example, when the intrinsic viscosity difference between PTT polymers is about 0.1 or more, in order to eliminate bending and realize stable spinning, the ejection holes must be inclined at least 10 degrees or more with respect to the vertical direction. preferable. When increasing the intrinsic viscosity difference, it is preferable to further increase the inclination angle. However, if the angle of inclination exceeds 40 degrees, the ejection portion becomes elliptical, and stable spinning becomes difficult. In addition, there is a difficulty in manufacturing the hole itself. The preferred inclination angle is 15 to 35 degrees, more preferably 20 to 30 degrees.
In the present invention, this inclination angle is more effective when the ratio of the hole diameter to the hole length is 2 or more. If the ratio between the hole diameter and the hole length is less than 2, it is difficult to obtain a stable ejection effect no matter how the inclination angle is adjusted.
[0025]
In the production method of the present invention, using the spinneret having the above-described discharge hole, the discharge conditions after the two types of polyesters have joined are adjusted to the average intrinsic viscosity [η] (dl / g) and the discharge linear velocity V (m / min). ) Is 3 to 20 (dl / g) · (m / min).
This discharge condition is a necessary condition for eliminating hole contamination due to "medium" adhering to the periphery of the hole by long-time spinning and making the 10% elongation stress value difference within the scope of the present invention. If this product is less than 3 (dl / g) · (m / min), the contamination between the holes decreases, but the ratio between the discharge speed and the winding speed becomes excessive, and the 10% elongation stress difference exceeds 0.30 cN / dtex. It becomes. If it exceeds 20 (dl / g) · (m / min), the rate of contamination of the pores will increase remarkably, making continuous production difficult. A preferred range is 5 to 15 (dl / g) · (m / min).
[0026]
In the production method of the present invention, after the spinning and cooling, the undrawn yarn is stretched without being once wound up, and then heat-treated at a tension of 0.05 to 0.25 cN / dtex between the second roll and the third roll. It is necessary to.
When the heat treatment tension exceeds 0.25 cN / dtex, the heat shrinkage stress value exceeds 0.24 cN / dtex, and wool-like wrinkles are generated in the woven fabric. If the heat treatment tension is less than 0.05 cN / dtex, the stretch ratio becomes less than 2%, and the stretchability is insufficient. Preferred heat treatment tension is 0.10 to 0.20 cN / dtex.
[0027]
In the production method of the present invention, it is necessary to wind at a winding speed of 4000 m / min or less.
If the winding speed exceeds 4000 m / min, the package after winding shrinks with time, and periodic unevenness due to the end of the package occurs, and the quality of the fabric deteriorates. The 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 1500 to 3000 m / min, and after the drawing, heat treatment is performed. If the spinning speed is less than 1500 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 drawn PTT-based conjugate fiber will be about 2 cN / dtex or less, which may restrict development in fields where strength is required. The preferred spinning speed is from 1600 to 2500 m / min.
[0028]
FIG. 2 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. Similarly, the other component is 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.
[0029]
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.
The PTT multifilament 10 extruded into the spinning chamber passes through a non-blowing region 11 having a length of 50 to 300 mm, is cooled and solidified to room temperature by a cooling air 12, applies a finishing agent, and rotates at a predetermined speed. After being taken up by the first godet roll 14, without being wound once, and then continuously stretched with a second godet roll (in this drawing, a heated godet roll) 15, after being stretched and heat-treated by the third godet roll 16, It is wound as a composite fiber package 17 having a predetermined fineness by a winder.
[0030]
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. 2, a pair of pretension rolls may be provided before the take-off godet rolls.
Between two pairs of godet rolls, stretching is performed 1.2 to 3 times by changing the peripheral speed of the godet rolls.
[0031]
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.
[0032]
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. 2).
When the stretching tension is less than 0.3 cN / dtex, the strength of the PTT-based conjugate fiber is less than about 2 cN / dtex, and the mechanical strength is insufficient. When the stretching tension exceeds 0.5 cN / dtex, the elongation at break becomes less than 30%, and stable spinning becomes difficult. The 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.
[0033]
In the production method of the present invention, in order to improve the removability of the PTT-based composite fiber from the package, the winding angle is set to 3 degrees to 3 degrees depending on each winding diameter from the start to the end of the winding of the package. It is preferable that the winding is performed with a difference of 10 degrees. The twill angle can be set by adjusting the winding speed and the traverse speed. If the winding angle is less than 3 degrees, winding collapse will occur and normal winding will be difficult. When the winding angle exceeds 10 degrees, the dry yarn shrinkage stress of the drawn yarn and the cooling at the time of winding are increased, so that the object of the present invention cannot be sufficiently achieved. Preferred twill angles are in the range of 4 to 9 degrees.
[0034]
In the present invention, it is preferable that the twill angle of the intermediate layer be larger than that of the inner layer. Here, the inner layer of the package refers to a laminated portion whose winding thickness from the bobbin is within about 10 mm. The most preferable example in which the twill angle is varied depending on the winding diameter is to lower the twill angle at the start of winding, that is, at the inner layer of the package, to gradually increase the twill angle with the increase of the winding diameter, and to make the highest at the middle layer of the package. Thereafter, at the outer layer, the twill angle is reduced again. In this manner, by changing the winding angle depending on the winding diameter and winding, it is possible to sufficiently reduce both the bulge and the ear height of the package.
[0035]
As the structure of the woven fabric, various woven structures derived from them, including a plain woven structure, a twill woven structure, and a satin woven structure, can be applied. In the woven fabric, the PTT-based composite fiber of the present invention can be used for only the warp, the weft, or both of the warps. These fabrics have a stretch ratio of at least 10%, preferably 15% or more, more preferably 20% or more. When the stretch rate is 10% or more, the object of the present invention is effectively exhibited because the elastic body follows a local and instantaneous movement displacement instantaneously when used in sports clothing or the like. The recovery rate of the woven fabric is preferably 80 to 100%. More preferably, it is 85 to 100%. Another feature of the present invention is that the elongation stress when elongating the woven fabric is small. For example, when the stress at 10% elongation is 150 cN / cm or less, the feeling of pressure upon wearing is small, which is preferable. More preferably, it is 50 to 100 cN / cm. 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.
[0036]
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 = twist number T (times / m) × (fineness of false twisted yarn; dtex)^1/2
[0037]
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.
[0038]
In addition, in order to obtain a woven fabric in which a conjugate fiber and another fiber are mixed and compounded, as the mixed fiber, another fiber is interlaced, interlaced and stretched false twisted, and only one of the fibers is false twisted. Thereafter, interlace blending, both separately false-twisted interlace blending, either one can be manufactured by various blending methods such as interlace blending after Taslan processing, Taslan processing after interlace blending, Taslan blending, and the like. . The mixed fiber composite yarn obtained by such a method is preferably provided with 10 or more entanglements, preferably 15 to 50 entanglements / m.
[0039]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to Examples, but it goes without saying that the present invention is not limited 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, and a relative viscosity It is defined as C is the polymer concentration expressed in g / 100 ml.
[0040]
(2) Stretch elongation rate Vc of overt crimp
The yarn was squeezed 10 times with a measuring machine having a circumference of 1.125 m, and allowed to stand in a constant temperature and humidity room specified by JIS-L-1013 without any load for 24 hours a day.
Next, the skein is subjected to the load shown below to measure the skein length, and the actual expansion / contraction elongation Vc is measured from the following equation.
Stretch elongation% = (L2-L1) / L1 × 100
L1 = 1 × 10^-3Skew length with cN / dtex load applied
L2 = 0.18 cN / dtex Skew length with load applied
[0041]
(3) 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. Next, a dry heat treatment is performed at 180 ° C. for 15 minutes while applying the same load. After the treatment, the sample was left unloaded and 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, ΔL1 = 1 × 10^-3Skew length with cN / dtex load applied
L2 = 0.18 cN / dtex Skew length with load applied
[0042]
(4) Breaking strength, breaking elongation, stress value difference at 10% elongation
The breaking strength and the breaking elongation were measured based on JIS-L-1013.
The stress difference at 10% elongation was measured by elongation-stress measurement 100 times in the yarn length direction, and the stress (cN) at 10% elongation was measured. The maximum value and the minimum value of the measured values were read, and this difference was gradually reduced by fineness (dtex) to obtain a 10% elongation stress value difference (cN / dtex).
[0043]
(5) Dry heat shrinkage stress value
It measured using the thermal-stress measuring device (made by Kanebo Engineering Co., Ltd., brand name KE-2).
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 change in temperature 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)
[0044]
(6) Spinning stability
Using a melt spinning-continuous stretching machine equipped with a spinning end of 8 ends per spindle, melt spinning-continuous stretching 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.
◎; No thread breakage, fluff generation package ratio 5% or less
○; Within 2 thread breaks, fluff generation package ratio less than 10%
×; 3 times or more thread breaks, fluff generation package ratio 10% or more
[0045]
(7) Fabric adjustment
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 Co., Ltd. “Solo”) non-twisted and glued yarn as the warp, and using the 56 dtex / 24f composite fiber of each Example and Comparative Example of the present invention as the weft. .
Coarse density 110 / 2.54cm
Weft density 98 / 2.54cm
Loom made by Tsudakoma Kogyo Co., Ltd. Water jet loom ZW-303
Weaving speed 450 rpm
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 treatments at 175 ° C. for finishing and tentering heat setting were performed.
[0046]
(8) Fabric evaluation
The obtained woven fabric was inspected by a skilled inspection technician, and the weft dyeing quality was determined as follows.
◎: Very good, 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
[0047]
(9) Stretch rate and recovery rate of woven fabric
The stretch ratio and the recovery ratio were evaluated using the obtained woven fabric by the following methods.
Elongation under a stress of 2.94 N / cm when the sample is stretched in the weft direction using a tensile tester manufactured by Shimadzu Corporation with a grip width of 2 cm, a grip interval of 10 cm, and a tensile speed of 10 cm / min. (%) Was taken as the stretch rate. After that, it is grasped again at the same speed and contracted to a spacing of 10 cm, and then a stress-strain curve is drawn again. The recovery rate was determined by the following equation.
Recovery rate = [(10−A) / 10] × 100%
[0048]
(10) Comprehensive evaluation
◎; Both spinning stability and textile quality are extremely good
○: Good spinning stability and good fabric quality
×: Either spinning stability or fabric quality is poor
[0049]
Examples 1-4, Comparative Example 1
In this example, the effect of the intrinsic viscosity difference between the two components will be described.
As shown in Table 1, a high intrinsic viscosity PTT containing 0.4% by weight of titanium oxide as one component and a low intrinsic viscosity PTT pellet containing 0.4% by weight of titanium oxide as the other component are shown in FIG. A 56 dtex / 24 filament PTT composite fiber package was produced using a spinning machine as shown and a winder having three pairs of godet rolls.
[0050]
The spinning conditions in this example are as follows.

[0051]

[0052]
[Table 1]

As is clear from Table 1, when the intrinsic viscosity difference between the two components falls within the range of the present invention, the woven fabric exhibits good stretchability and stretch recovery.
[0053]
Examples 5-7, Comparative Examples 2-3
In this example, the elongation at break of the PTT-based composite fiber and the elongation and_CAnd the stretch ratio under load CE_3.5The effect will be described.
With the combination of the intrinsic viscosities shown in Example 2, conjugate fibers were obtained by changing the speed ratio between 1 godet roll and 2 godet rolls, that is, the draw ratio as shown in Table 2.
Table 2 shows the physical properties of the obtained conjugate fiber and woven fabric.
[0054]
[Table 2]

As is apparent from Table 2, if the elongation at break of the conjugate fiber and the elongation and contraction elongation of the apparent crimp, and the elongation and elongation under load are within the range of the present invention, good spinning stability and good fabric quality can be obtained. Show.
As shown in Comparative Example 3, if the elongation at break was out of the range of the present invention, yarn breakage occurred during spinning, and industrial production was difficult.
[0055]
Examples 8 to 10 and Comparative Examples 4 to 5
In this example, effects of dry heat shrinkage stress and elongation at break will be described.
In performing the direct spinning and drawing in the same manner as in Example 2, the heat treatment tension between the second godet roll and the third godet roll was varied as shown in Table 3.
Table 3 shows the physical properties of the obtained conjugate fiber and woven fabric.
[0056]
[Table 3]

As is clear from Table 3, when the dry heat shrinkage stress and the breaking elongation of the composite fiber were within the ranges of the present invention, the fiber had good spinnability and woven fabric quality.
[0057]
Examples 11 to 13, Comparative Example 6
In this embodiment, preferred modes of the spinning speed and the winding speed will be described.
In the combination of the intrinsic viscosities shown in Example 2, the speed of the first godet roll, that is, the spinning speed and the winding speed were varied as shown in Table 4 to obtain a conjugate fiber.
Table 4 shows the physical properties of the obtained composite fiber.
[0058]
[Table 4]

As is clear from Table 4, when the spinning speed was 1500 m / min or more, the dyed quality of the processed yarn was good.
[0059]
Examples 14 to 16, Comparative Example 7
Example 1 In this example, the effect of the type of polymer used for producing a conjugate fiber will be described.
Except for the combinations of the two polymers shown in Table 5, conjugate fibers were obtained under the spinning and drawing conditions shown in Example 2.
Table 5 shows the physical properties of the obtained conjugate fiber and woven fabric.
[0060]
[Table 5]

As is clear from Table 5, the conjugate fiber using PTT for at least one of them had good woven fabric quality, stretchability and stretch recovery.
Comparative Example 7 lacked stretchability because it did not contain PTT.
[0061]
Examples 17 to 20, Comparative Examples 8 to 10
Example 1 In this example, the effect of a spinning hole used for spinning will be described.
In performing the direct spinning and drawing in the same manner as in Example 2, the spinning was performed using a spout having different discharge hole diameters and inclination angles shown in Table 6.
Table 6 shows the spinnability and the quality of the obtained woven fabric.
[0062]
[Table 6]

As is clear from Table 6, when the spinning nozzle shown in the production method of the present invention was used, good spinnability and woven fabric quality were obtained.
[0063]
【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 production method for producing the PTT-based conjugate fiber at low cost by a direct spin drawing method.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a discharge hole used when spinning the conjugate fiber of the present invention.
FIG. 2 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: Non-blast 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 (4)

The two polyester components consist 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 (5) A polytrimethylene terephthalate-based composite fiber, which satisfies the requirement of (1).
(1) boiling water treatment before stretching elongation of crimp that elicited 20% or less in ^{(2) 3.5 × 10 -3 cN} / dtex stretching elongation of applying a load of being measured after treatment boiling water 2-10%
(3) Dry heat shrinkage stress value of 0.05 to 0.24 cN / dtex
(4) Elongation at break is 30 to 45%
(5) Elongation—The stress value at 10% elongation in the stress measurement is such that the difference between the maximum and minimum along the yarn length direction is 0.30 cN / dtex or less. The polytrimethylene terephthalate-based composite fiber according to claim 1, wherein the composite fiber has a dry heat shrinkage stress value of 0.05 to 0.15 cN / dtex. The polytrimethylene terephthalate-based composite fiber according to claim 1 or 2, wherein both components constituting the single yarn are polytrimethylene terephthalate. In producing a composite fiber in which two polyester components are composed 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 requirements (A) to (D).
(A) the difference in intrinsic viscosity between the two polyester components is 0.05 to 0.9,
(B) After the two polyester components have merged, the ratio of the discharge hole diameter to the hole length is 2 or more, and the discharge hole is discharged using a spinning hole having an inclination of 10 to 40 degrees with respect to the vertical direction, and after cooling. After stretching without winding,
(C) heat-treating between the second roll and the third roll with a tension of 0.05 to 0.25 cN / dtex,
(D) Winding at a winding speed of 4000 m / min or less.

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