JP2005350777A - Polyester fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester fiber achieving waterproof or image-blocking property and lighting property at the same time by only weaving or knitting, and enabling to have also refreshing feeling, stiff body feeling and glossiness. <P>SOLUTION: This polyester fiber is provided by consisting of a single fiber having ≤2.5 dtex single fiber fineness and a flat multilobed shape of 6-10 lobes of the single fiber cross sectional shape, and satisfying the following formulae on taking the longest diameter joining the apices of circumcircle of the flat multilobed shape as A, the maximum short diameter among the short diameters crossing at right angle with the long diameter A and joining the apices of projected parts of the flat multilobed shape as B, the same as the short diameter B or a second long short diameter as C and the minimum short diameter among the short diameters obtained by joining bottom points of the recessed parts of the flat multilobed shape as D, and having 35 to 70 glossiness of the single fiber, and the woven fabric consisting of the same is provided. Flatness (A/B)=1.2 to 2.2, degree of multi-lobe I (C/D)=1.1 to 1.3, degree of multilobe II (B/D)=1.1 to 1.6, and A>B≥C>D. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a polyester fiber, and more particularly to a polyester fiber that can give a woven or knitted fabric a refreshing feeling, a firm feeling, and a glossy feeling.

  Conventionally, particularly in sports clothing, as a method of simultaneously imparting both moisture permeability and waterproofing (water resistance) functions to a fabric, a microporous resin layer is applied to the surface of the fabric that has been water-repellent processed by resin coating or film lamination. Many methods of forming are performed. However, since this method forms a large number of layers on the surface of the woven fabric, many processes are required for production, and it is inevitable that the cost increases.

  As a countermeasure against such a problem, the desired function can be obtained only by making the fiber into a woven fabric, and by making the round cross-sectional ultrafine multifilament having a single fiber fineness of 0.45 dtex or less into a woven fabric, A method for improving water pressure resistance (for example, see Patent Document 1), and a method for improving water pressure resistance by forming a mixed multifilament of 1.8 dtex W-shaped irregular cross-section filament and 0.25 dtex round cross-section ultrafine filament into a woven fabric. (For example, refer patent document 2) etc. are proposed.

  However, although these methods can improve the water pressure resistance, there is a drawback that the fabric is crushed and there is no harshness. There is also a proposal of a method of obtaining water resistance and softness by using a multifilament with a single fiber cross-section having a modified shape to obtain a woven fabric (see, for example, Patent Document 3). However, this method also improves the water resistance, but does not solve the drawbacks of inferior refreshing feeling, glossiness, and harshness.

  Moreover, in the conventional curtain for indoor interiors, the effect which has both image-shielding property and daylighting property which can be obtained with a shoji cannot be achieved. For this reason, lace curtains that produce various patterns with yarn or woven knitting structure are the mainstream for indoor interior thin curtains that have an opening that aims to combine moderate brightness in the daytime and difficult to see from the outside. It has become.

  As a woven or knitted fabric with openings, there is a fabric called a boiled fabric. However, since both the warp and the weft used in this woven fabric have a twist number of 800 times / m or more, the frictional resistance between the yarns is high, and the binding force at the intersection of the woven warp and the weft is high. Since the morphological stability of the fabric is improved by heating, there is a problem that the texture becomes hard. For this reason, when the curtain is hung, there is a drawback that the diameter of the wave bend becomes large, and it is difficult to produce a deep and beautiful wave and a light fluttering in the wind. In order to solve this problem, there is a technology to soften the texture of the curtain fabric by applying alkali weight reduction treatment and making the fibers that make up the fabric thinner. However, it is difficult to obtain satisfactory softness and the number of processes increases, so the manufacturing cost is increased. Becomes higher.

From the background as described above, there has been proposed a method for providing a soft fabric for curtains by using a polyester fiber having a hot water shrinkage rate of 5% or less and optimizing the weaving conditions (for example, (See Patent Document 4). However, with this method, although it is a fabric for curtains that forms deep, clean waves at regular intervals, it has not been possible to achieve image-shielding properties and daylighting properties.
JP-A-9-170175 JP-A-62-238842 Japanese Patent Laid-Open No. 11-286848 JP 2001-224493 A

  The object of the present invention is to solve the above-mentioned problems of the prior art, and to impart excellent water resistance only by weaving at a high density, and also to provide a refreshing feeling, a harsh feeling, and a glossy feeling, It is to provide a polyester fiber fabric.

  Another object of the present invention is that the texture is soft just by weaving and knitting at a low density, forming a good wave, and having both the image-shielding property and the daylighting property. It is an object of the present invention to provide a polyester fiber that can give a glossy feeling, particularly a polyester fiber suitable for woven or knitted fabric for curtains.

The polyester fiber of the present invention that achieves the above object is a flat multilobal shape having a single fiber fineness of 2.5 dtex or less and a single fiber cross-sectional shape of 6 to 10 leaves, and between the vertices of the circumscribed circle of the flat multileaf shape A is the longest major axis connecting A, and B is the largest minor axis among the minor diameters orthogonal to the major axis A and connecting the vertices of the flat multilobed convex portions. When the shortest short diameter out of the short diameters connecting the bottoms of the flat multilobed recesses is D, the long short diameter is made of a single fiber that satisfies the following formula; The single fiber has a glossiness of 35 to 70.
Flatness (A / B) = 1.2 to 2.2
Deformation degree I (C / D) = 1.1 to 1.3
Deformation degree II (B / D) = 1.1 to 1.6
A> B ≧ C> D

  According to the polyester fiber of the present invention, the single fiber fineness is small as described above, the flatness (A / B) and the irregularities I and II are specified, and the glossiness is 35 to 35. By forming the polyester fiber with a single fiber of 70, the polyester fiber has excellent water resistance just by weaving the polyester fiber at a high density, and it is made into a woven fabric having excellent refreshing feeling, harshness feeling, and glossiness. be able to.

  In addition, according to the polyester fiber of the present invention, by having the above-described configuration, the texture is soft just by weaving and knitting the polyester fiber at a low density, and a good wave is formed. In addition to being provided at the same time, it is possible to obtain a woven or knitted fabric having excellent refreshing sensation, harshness and glossiness, and particularly to an excellent woven or knitted fabric suitable for curtains.

  The polyester used for the polyester fiber of the present invention is not particularly limited as long as it is a fiber-forming polyester. For example, polyethylene terephthalate, polybutylene terephthalate, or the like can be used, and a copolymer component may be contained as long as the properties of the fiber are not impaired.

  In the polyester fiber of the present invention, the single fiber cross-sectional shape in a cross section orthogonal to the fiber axis direction is a flat multilobal shape of 6 to 10 leaves as exemplified in FIG. 1, and preferably 6 to 8 leaves. It has a flat multilobal cross-sectional shape. By having such a flat multilobal cross-sectional shape, convex portions and concave portions are alternately formed on the outer periphery of the filament, and good gloss can be exhibited. In particular, those having a flat cross section of 6 to 8 leaves can express a silver-like luster. In particular, in the case of a flat eight-leaf cross section, a gloss with a high-class feeling can be expressed.

  Further, the polyester fiber of the present invention can exhibit a higher gloss feeling in synergy with the glossy action by the concavo-convex part by not adding a matting agent to the polyester which is a constituent material. It can be as high as 70, more preferably 45-65. When the glossiness is less than 35, a mild glossy feeling cannot be obtained. When the glossiness is more than 70, the yarn becomes more irritated and the mildness is reduced when a high-density fabric is used.

  The polyester fiber of the present invention further exhibits appropriate rigidity by being formed in a flat multilobal cross section of 6 to 10 leaves, and when it is made into a woven fabric or a knitted fabric, it is difficult to stick and has an excellent feeling of elasticity. Furthermore, a large number of recesses formed on the filament surface give a smooth texture when made into a woven or knitted fabric, and give a “smooth” feel when the surface of the woven or knitted fabric is lightly touched. When touched more strongly, it feels moderate “squeak”. The texture of these “smooth” feeling and “squeaky” feeling is referred to as “cool feeling”.

  The polyester fiber of the present invention has a long diameter and a short diameter when the flat multi-leaf cross-sectional shape in a single fiber cross-section is surrounded by a circumscribed circle in order to satisfy the above-described glossiness of 35 to 70, crispness, and refreshing feeling. The relationship must be as described below.

1 (A), (B), and (C) show typical examples of a single fiber cross section. This single fiber cross section is a flat multilobal shape of six to ten lobes, and a single fiber satisfying the following formula: Made of fiber.
Flatness (A / B) = 1.2 to 2.2
Deformation degree I (C / D) = 1.1 to 1.3
Deformation degree II (B / D) = 1.1 to 1.6
A> B ≧ C> D

  Here, A is the longest major axis connecting the vertices of the circumscribed circle of the flat multilobal shape. Further, B is the largest minor axis among the minor axes that are orthogonal to the direction of the major axis A and connect the apexes of the flat multilobed convex portions. C is the same length as the minor axis B or the second minor axis. Further, D is the shortest short diameter among the short diameters connecting the bottom points of the flat multilobed concave portions.

  When the flatness (A / B) is less than 1.2, the effect of improving the glossiness is not recognized. When the flatness (A / B) exceeds 2.2, the harshness of the woven fabric or knitted fabric is small, and it becomes easy to wear. In addition, the yarn-making property is deteriorated and the unwinding property of the yarn is deteriorated. The flatness (A / B) is more preferably 1.3 to 2.1, and still more preferably 1.4 to 2.0. Further, when the irregularity degree I (C / D) is larger than 1.3 or the irregularity degree II (B / D) is larger than 1.6, the glossiness is lowered. In addition, the convex portions are worn away by rubbing in higher-order processes, wearing or washing clothes, and the fiber cross section is changed, and fibrillation tends to occur.

In the polyester fiber of the present invention, specific internal particles composed of 2 to 20% by weight of calcium element and 2 to 20% by weight of phosphorus element when measured by the measurement method described later are 0.03 to 0 in the fiber. It is preferable to contain 5% by weight. More preferably, it is 0.05 to 0.3% by weight. When the content of the internal particles is less than 0.03% by weight, the flow stability during melt spinning is sufficient when spinning is performed to produce oriented yarns having birefringence of 13 × 10 ⁻³ to 80 × 10 ^−3. In addition, the thermal deformation at the glass transition point or higher and below the melting point is not sufficient and not preferable.

  When the amount of phosphorus element in the internal particles is less than 2% by weight, the generated particles are easily coarsened. For this reason, it becomes easy to lack the flow stability at the time of melt spinning, and the heat deformability at the glass transition point or higher and below the melting point. The reason for this is considered to be that the presence of phosphorus in the calcium-based inner particles further increases the affinity of the particles for the polymer substrate, and therefore, aggregation and coarsening of the particles are less likely to occur. It is not limited to the reason.

  On the other hand, when the amount of calcium element in the internal particles is less than 2% by weight or the amount of phosphorus element exceeds 20% by weight, the properties of the generated particles are too close to the base polyester and dissolve in the polyester component. Therefore, the necessary and sufficient amount of particles cannot be ensured, so that the flow stability at the time of melt spinning and the heat deformability from the glass transition point to the melting point or less tend to be lacking.

Further, the internal particles may have substantially no absorption at 1600 cm ⁻¹ that occurs when the stretching vibration of the double bond of the carbonyl group in the infrared absorption spectrum measured for the separated internal particles is adjacent to the metal element. preferable.

[Method for measuring the amount of internal particles]
An oriented yarn having a birefringence of 13 × 10 ⁻³ to 80 × 10 ⁻³ obtained by melt spinning is sufficiently washed with methanol, the oil agent is removed, washed with water, and dried. 300 g of this polyester fiber is sampled, 2.7 kg of o-chlorophenol is added thereto, and the temperature is raised to 100 ° C. while stirring. After the temperature rise, the polymer portion is allowed to stand for 1 hour.

  However, under these conditions, the polymer portion can be melted and then rapidly cooled after being sufficiently crystallized, and the sample can be obtained under the above-mentioned dissolution conditions. Next, the solution is filtered with a G-3 glass filter to remove insoluble matters other than internal particles such as dust contained in the polymer or added reinforcing agent, and this weight is subtracted from the sample amount.

  The rotor RP30 is installed in the separation ultracentrifuge 40P type manufactured by Hitachi, Ltd. After injecting 3.0 cc of the above solution per cell, the rotor is rotated to 4500 rpm, and after confirming that there is no abnormal rotation, Vacuum is applied, the rotational speed is increased to 30000 rpm, and the particles are centrifuged at this rotational speed. Separation is completed after about 40 minutes, but this confirmation is made if necessary, by confirming that the light transmittance at 375 mμ of the liquid after separation becomes a constant value higher than that before separation.

  After separation, the supernatant is removed by a gradient method to obtain separated particles.

  Since the separated particles may be mixed with a polymer due to insufficient separation, normal temperature o-chlorophenol is added to the collected particles, and the suspension is subjected to ultracentrifugation again after almost uniform suspension.

  This operation needs to be repeated after the particles have been dried until the melting point corresponding to the polymer can no longer be detected by scanning differential calorimetry.

  Finally, the separated particles thus obtained are vacuum-dried at 120 ° C. for 16 hours and weighed.

[Measurement method of infrared absorption spectrum]
0.8 mg of a sample is pressed together with 300 mg of KBr by a conventional method, a KBr tablet is prepared, and measured in a wavelength region of 650 to 4000 cm ⁻¹ using a rock salt prism with a Hitachi infrared spectrophotometer EP1-2 type.

  In producing the polyester fiber of the present invention, it is preferable to take the following conditions.

That is, when a polyester is produced from a lower alkyl ester of terephthalic acid and ethylene glycol, phosphoric acid and phosphoric acid methyl ester are converted into the following (1), (2), (3) in the presence of a calcium compound after transesterification. ) In the presence of a polymerization catalyst by adding an amount satisfying the formula.
(1) 6 × 10 ⁻⁶ ≦ 3X + 2Y ≦ 30 × 10 ⁻⁶
(2) 0.25 × 10 ⁻⁶ ≦ X ≦ 5 × 10 ⁻⁶
(3) 0.5 × 10 ⁻⁶ ≦ Y ≦ 10 × 10 ⁻⁶
(However, X represents the number of moles of phosphorous acid relative to 1 g of the lower alkyl ester of terephthalic acid, and Y represents the number of moles of phosphoric acid methyl ester.)

  The calcium compound may be used as a transesterification catalyst, or another metal compound may be used as a transesterification catalyst and added after completion of transesterification. Any calcium compound may be used as long as it is soluble in the reaction system. In particular, calcium acetate, calcium chloride, and calcium hydride are preferable.

  The addition of phosphorous acid and methyl ester of phosphoric acid is carried out after the transesterification reaction, but it is preferably completed before the polycondensation reaction proceeds so much. The phosphorous acid and phosphoric acid methyl ester may be added simultaneously or separately, or may be added separately. Trimethyl phosphate is preferably used as the methyl ester of phosphoric acid.

If the amount of phosphorous acid added is less than 0.25 × 10 ⁻⁶ , the amount of calcium element in the internal particles exceeds 20% and the amount of phosphorus element is less than 2%, and if it exceeds 5 × 10 ⁻⁶ , Becomes darker. When the amount of phosphoric acid methyl ester added is less than 0.5 × 10 ⁻⁶ , the amount of internal particles exceeds 0.5%, and when it exceeds 10 × 10 ⁻⁶ , the amount of calcium element is 2 % And the amount of phosphorus element exceeds 20%, the glossiness tends to be impaired.

And when the addition ratio of both phosphorous acid and phosphoric acid methyl ester deviates from the lower limit of the formula (1), absorption of 1600 cm ⁻¹ appears in the infrared absorption spectrum of the internal particles, and deviates from the upper limit of the formula (1). When the amount of internal particles is 0.03% or less, the polymerization productivity of the polymer tends to decrease.

  In other words, the added particles do not become particles as they are, but precipitate due to reaction modification in the polyester synthesis reaction system, so the amount of particles and the generation of particles are likely to change greatly depending on the composition of the added materials. As a result, the glossiness and water resistance which are the characteristics of the polyester fiber of the present invention tend to be impaired.

Regarding the process passability of the polyester fiber of the present invention and the effect of improving the product quality obtained therefrom, when the birefringence is less than 13 × 10 ^−3, fluff is likely to occur during stretching and stretching false twisting. Become. On the other hand, when the birefringence exceeds 80 × 10 ⁻³ , high orientation is obtained, and fluff and yarn breakage are generated by stretching or stretching false twisting, and uniformity is easily impaired.

  The polyester fiber of the present invention needs to have a fineness of single fiber fineness of 2.5 dtex or less. When the single fiber fineness is larger than 2.5 dtex, a feeling of coarseness is generated, and when it comes into contact with the skin, it becomes uncomfortable and a refreshing feeling cannot be obtained. Moreover, since it becomes easy to produce a space | gap between single yarn when it is set as a textile fabric, water resistance will fall. However, even if the single fiber fineness is too small, the friction resistance and the like are lowered. Therefore, the lower limit of the single fiber fineness is preferably 0.5 dtex.

  The total fineness of the polyester fiber is not particularly limited, but is preferably in the range of 56 to 167 dtex. In particular, when the total fineness is set to about 84 dtex, the water resistance can be made most favorable when a high-density fabric is used. In addition, in the case of about 110 tex, the light shielding property and the daylighting property can be made most favorable when a low-density woven or knitted fabric is used particularly for curtains.

  The strength and elongation of the polyester fiber are not particularly limited, but preferably the strength is 3 to 7 cN / dtex. In particular, in the case of a high-density woven fabric, about 4.5 cN / dtex is preferable from the viewpoint of fastness. Further, the elongation is preferably in the range of 18 to 40%. In particular, in order to improve the texture of the high-density woven fabric and the woven or knitted fabric for curtains, the content is preferably about 22 to 30%.

  Further, the polyester fiber of the present invention preferably has a boiling water shrinkage of 5% or less. When the boiling water shrinkage ratio is larger than 5%, the fabric becomes hard due to the shrinkage of the fiber when the fabric is refined and dyed, or when the knitted fabric is dyed, and the texture tends to be impaired. In addition, since the woven or knitted fabric loses its shape due to the shrinkage of the fiber, and a uniform woven or knitted density cannot be obtained, the water resistance decreases in the case of a high-density woven fabric, and in the case of a woven or knitted fabric for curtains, There is a tendency for daylighting to decrease.

  Although the manufacturing method of the polyester fiber mentioned above is not specifically limited, Preferably it can manufacture by a melt spinning method. As the discharge hole of the melt spinneret, those having a shape as shown in FIGS. 2A and 2B are preferably used. For example, in the case of the discharge hole in FIG. 2A, a filament having a single fiber cross section as shown in FIG. 1A is obtained, and in the case of the discharge hole in FIG. A filament having a single fiber cross section as shown in FIG.

  In the melt spinning step, yarn can be produced as shown in FIG. 3 or FIG. In the melt spinning step of FIG. 3, the melted polyester is discharged from the spinneret 2 of the spin pack 1 as two yarns, and the two yarns are cooled and solidified by cooling air with a cooling chimney 3, respectively. A spinning oil is applied by the oil supply guides 4 and 4, and the yarns are taken up by the take-up roller 6 while being entangled by the interlace nozzles 5 and 5, and finally wound on the packages 7 and 7 for each yarn. As the take-up speed in the take-up roller 6, 2500 to 3500 m / min is applied. The yarn wound around the package 7 is then stretched several times in the stretching step to obtain the polyester fiber of the present invention.

  The melt spinning process of FIG. 4 is different from the process of FIG. 3 in that the two yarns discharged from the spinneret 2 are converged as one yarn and wound into one package 7. ing.

  When the polyester fiber of the present invention is used for warp and / or weft to be woven into a high-density fabric, the fabric provides high water resistance just by weaving and is excellent in coolness, harshness and gloss. Can be obtained.

The cover factor WCF of the warp in the high-density fabric is in the range of 1450-1700, and the cover factor FCF of the weft is in the range of 870-1150. Further, the ratio FCF / WCF of both cover factors shall be in the range of 0.60 to 0.68. Here, the warp cover factor (WCF) and the warp cover factor (FCF) are defined as follows.
WCF = WN × √ (WD)
FCF = FN × √ (FD)

  However, in the above formula, WN is the product weave density of the warp (number of warps per 25 mm), WD is the total fineness before weaving the warp, FN is the product weave density of the weft (number of wefts per 25 mm), and FD is the weft of the weft Indicates the total fineness before weaving.

  The weaving method when making the polyester fiber of the present invention a high-density fabric is not particularly limited. Any known loom such as an air jet loom (AJL) or a water jet loom (WJL) can be used.

  The high-density fabric woven using the polyester fiber of the present invention has excellent water-cooling pressure based on JIS-L-1092A of 5.0 kPa or more, and also has excellent refreshing feeling, harshness, and glossiness. be able to. More preferably, the water pressure resistance can be set to 6.0 kPa or more, and it can be effectively developed as a fabric for sports clothing.

  On the other hand, when the polyester fiber of the present invention is used as a woven or knitted fabric for curtains, the polyester fiber has a low density, the Lb value indicating the image shielding effect is 10 to 25%, and the lighting rate is 30% to 45%. Thus, a woven or knitted fabric having both desired image-shielding properties and daylighting properties can be obtained simply by weaving or knitting. The density of the woven or knitted fabric is preferably 60 to 100 yarns / 25 mm in the case of a woven fabric, and 30 to 60 courses / 25 mm in the case of a knitted fabric.

  When the Lb value is less than 10%, the image-shielding effect is remarkably improved, but the daylighting property tends to be lowered, and it becomes difficult to obtain a woven or knitted fabric having both desired image-shielding property and daylighting property. On the other hand, if the Lb value exceeds 25%, the image shielding effect tends to be lowered. Moreover, when the lighting ratio is less than 30%, the room brightness tends to be insufficient when the curtain is used. On the other hand, if the lighting ratio exceeds 45%, the indoor brightness is sufficient, but the image-shielding effect tends to be reduced. The Lb value and the daylighting rate are measured by the measurement method described later.

  The woven or knitted fabric structure of the curtain woven or knitted fabric using the polyester fiber of the present invention is not particularly limited. Examples of the woven structure include plain weave, oblique weave (twill, twill), satin weave (satin), and the like. Any of these can be used. As the knitted fabric structure, any of a warp knitted tricot fabric, a russell fabric, a circular knitted fabric, a single circular knitted fabric, and a double circular knitted fabric can be used. The warp knitted fabric excellent in the thickness is preferable, and the tricot fabric is particularly preferable.

  Further, the polyester fiber of the present invention can be used not only as a woven or knitted fabric but also as an embroidery thread by making use of the characteristics of its refreshing feeling, firmness and glossiness. Thus, when using it as an embroidery thread, it is preferable to use the thing whose boiling water shrinkage rate is 5% or less from a viewpoint of form stability.

  Furthermore, the polyester fiber of the present invention can also be used as a woven or knitted fabric for inner use by taking advantage of its coolness, elasticity, and glossiness. In this inner use, it is possible to make full use of a refreshing feeling, a firm feeling, and a glossy feeling.

  Hereinafter, the present invention will be described in detail by way of examples. Each characteristic value used in the examples was determined by the following measurement method.

[Boiling water shrinkage]
The polyester fiber is wound 10 times with a casserole machine, the test length a is measured by applying a load of 0.09 g / dtex, heat-treated in boiling water at 100 ° C. for 15 minutes, and naturally dried for 8 hours or more and then 0.09 g A load of / dtex is applied, the test length b is measured, and the boiling water shrinkage is calculated from the following equation.
Boiling water shrinkage rate (%) = [(ab) / a] × 100

[Glossiness, texture characteristics (glossiness)]
A 1/3 twill woven fabric in which the test yarn was wefted was created, and the condition “incident angle 45 °, reflection angle 45 °” was measured using an automatic variable gloss meter (GP-200) manufactured by Murakami Color Research Laboratory Co., Ltd. In addition, the maximum value-minimum value was evaluated as the glossiness at an incident angle of 45 ° and a reflection angle of 90 °. At that time, the gloss of magnesium oxide white plate was set to 50.

  Also, in this test, the quality of glossiness was evaluated by an inspector with 10 years of experience or more. “Excellent” is ◯, “Excellent” is ◯, “Normal” is △, “Inferior” "" Was evaluated in 4 grades. A woven fabric woven in the same manner as described above with a polyethylene terephthalate round section drawn yarn 84dtex-48fil was used as a reference sample, and this was evaluated as "Inferior: x".

[Texture characteristics (coolness, harshness)]
For each item, the sample is subjected to a sensory test based on a paired comparison with the reference sample. “Excellent” is ○○, “Excellent” is ○, “Normal” is △, “Inferior” is × The four grades were evaluated. In addition, as a reference sample, what was woven in the same manner as the above sample using a polyethylene terephthalate round section drawn yarn 84dtex-48fil was used, and this was defined as "Inferior: x".

(Water pressure resistance)
It measured by the water resistance test method (hydrostatic pressure method) based on JIS-L-1092A. In addition, the reference value of the water pressure resistance of the present invention is 5.0 kPa or more.

[Lb value]
A woven fabric was prepared by the method described below, and dyeing, washing with water and drying were carried out by conventional methods. Using the fabric obtained by the above method, the Lb value was measured by the following method.

(1) Weaving method Stretched yarns of 84 dtex and 36 filaments were used for the warp, and the stretched yarns obtained in the examples and comparative examples were weaved at a width of 1.7 m, a weaving density of 90 yarns / 25 mm, and a loom rotation speed of 800 cpm. And weaving.
(2) Lb value measurement method.

    Using a colorimeter SM-3 manufactured by Suga Test Instruments Co., Ltd., check the blackness and whiteness of the measurement sample installation area. To check the blackness, attach a felt cloth dyed in black to the measuring part and confirm that the L value (lightness) of the felt cloth is 14 ± 0.5%. To check the whiteness, attach a standard white plate to the measuring unit and check that the L value (brightness) of the standard white plate is 91 ± 0.5%. These confirmation procedures are the usual methods for measuring the L value (brightness) of fabrics and are generalized methods. The L value of a fabric with high whiteness is close to 91%, and conversely, the L value of a black fabric is close to 14%.

The Lb value is calculated by the following formula. Here, LB is an L value measured by attaching a black felt cloth and one evaluation sample to the measurement part, and LW is an L value measured by attaching a standard white board and one evaluation sample to the measurement part. Note that the same evaluation sample is repeatedly measured 5 times, and the average value is taken as the Lb value.
Lb = (LW−LB)

[Lighting rate (%)]
A woven fabric was prepared by the following method, and dyed, washed with water and dried by a conventional method. Using the woven fabric obtained by the above method, the lighting rate was measured by the following method.

(1) Weaving method Using 84 dtex-36 fil drawn yarn as the warp, the drawn yarn obtained in the examples and comparative examples as wefts, driven at a width of 1.7 m, a weaving density of 90 pieces / 25 mm, and a loom rotation speed of 800 cpm. Suppose weaving.
(2) Daylighting rate measuring method The ratio of the fabric transmission illuminance when irradiated with a reflex lamp (10,000 lux) is taken as the daylighting rate (%).

Examples 1-3 and Comparative Examples 1-6
A transesterification reaction is carried out for 4.5 hr while continuously removing methanol produced by heating 100 parts of dimethyl terephthalate, 71 parts of ethylene glycol and 0.09 part of calcium acetate to 150 to 230 ° C. Next, phosphorous acid and trimethyl phosphate are added, 0.03 part of antimony oxide is added, and the temperature is gradually raised to 1 hour at 280 ° C. and the pressure is reduced to 133 Pa or less. Polymerization is performed at 280 ° C. and a vacuum of 133 Pa or less until the intrinsic viscosity becomes 0.66. The intrinsic viscosity was adjusted by measuring the torque of the agitator. The intrinsic viscosity of the polymer was measured in o-chlorophenol at 25 ° C.

  After the obtained polymer was cut into chips and polyethylene terephthalate dried at 180 ° C. for 5 hours was used, and after drawing at a spinning speed of 3000 m / min so as to have different flatness, irregularity I, and irregularity II, respectively. The film was stretched at a stretching ratio of 1.72. The obtained drawn yarn characteristics are shown in Table 1.

  Next, the obtained drawn yarn was used for warp and weft to make a high-density fabric with a cover factor of WCF = 1500 and FCF = 990, and the obtained properties are shown in Table 1.

  From the result of Table 1, Examples 1-3 have water resistance by having sufficient cross-sectional shape, flatness, irregularity degree I, irregularity degree II, and single yarn fineness, and are very excellent refreshing feeling and harshness feeling. And a high-density fabric having a glossy feeling was obtained. On the other hand, Comparative Examples 1 to 6 had insufficient harshness and no glossiness.

Examples 4 and 5 and Comparative Examples 7 and 8
A 4.5 hr transesterification reaction is carried out while continuously removing 100 parts of dimethyl terephthalate, 71 parts of ethylene glycol, and 0.09 part of calcium acetate to 150 to 230 ° C. and continuously removing methanol generated from the system. Next, phosphorous acid and trimethyl phosphate are added, 0.03 part of antimony oxide is added, and the temperature is gradually raised to 1 hour at 280 ° C. and the pressure is reduced to 133 Pa or less. However, only in Comparative Example 7, titanium oxide is further added as a matting agent simultaneously with other additives. Polymerization is performed at 280 ° C. and a vacuum of 133 Pa or less until the intrinsic viscosity becomes 0.66. The intrinsic viscosity was adjusted by measuring the torque of the agitator. The intrinsic viscosity of the polymer was measured in o-chlorophenol at 25 ° C.

  The obtained polymer was cut into chips and the polyethylene terephthalate dried at 180 ° C. for 5 hours was taken up at a spinning speed of 2800 m / min and then drawn at a draw ratio of 1.82. The obtained drawn yarn is used for warp and weft to form a high-density fabric with a cover factor of WCF = 1650 and FCF = 1050, and the properties obtained are shown in Table 2.

  Examples 4 and 5 have a cross-sectional shape, flatness, irregularity degree I, irregularity degree II suitable for the present invention, and single yarn fineness is also suitable, so that it has water resistance, extremely excellent feeling of firmness and glossiness. Thus, a high-density fabric having an excellent refreshing feeling was obtained. On the other hand, Comparative Examples 7 and 8 were high-density fabrics having no water resistance and a feeling of coarseness.

Examples 6 and 7 and Comparative Example 9
A 4.5 hr transesterification reaction is carried out while continuously removing 100 parts of dimethyl terephthalate, 71 parts of ethylene glycol, and 0.09 part of calcium acetate to 150 to 230 ° C. and continuously removing methanol generated from the system. Next, phosphorous acid and trimethyl phosphate are added, 0.03 part of antimony oxide is added, and the temperature is gradually raised to 1 hour at 280 ° C. and the pressure is reduced to 133 Pa or less. Polymerization is performed at 280 ° C. and a vacuum of 133 Pa or less until the intrinsic viscosity becomes 0.66. The intrinsic viscosity was adjusted by measuring the torque of the agitator. The intrinsic viscosity of the polymer was measured in o-chlorophenol at 25 ° C.

  The obtained polymer was cut into chips and the polyethylene terephthalate dried at 180 ° C. for 5 hours was used, and each single yarn fineness was varied and taken at a spinning speed of 3200 m / min. Stretched. The obtained drawn yarn is used for warp and weft to form a high-density fabric with a cover factor of WCF = 1450 and FCF = 870, and the properties obtained are shown in Table 3.

  Examples 6 and 7 have a cross-sectional shape, flatness, irregularity degree I, irregularity degree II suitable for the present invention, and single yarn fineness is also suitable, so that they have water resistance, and extremely excellent harshness and glossiness. Thus, a high-density fabric having an excellent refreshing feeling was obtained. However, Comparative Example 9 was a high-density fabric having no water resistance and a feeling of coarseness.

Examples 8 and 9
A 4.5 hr transesterification reaction is carried out while continuously removing 100 parts of dimethyl terephthalate, 71 parts of ethylene glycol, and 0.09 part of calcium acetate to 150 to 230 ° C. and continuously removing methanol generated from the system. Next, phosphorous acid and trimethyl phosphate are added, 0.03 part of antimony oxide is added, and the temperature is gradually raised to 1 hour at 280 ° C. and the pressure is reduced to 133 Pa or less. Polymerization is performed at 280 ° C. and a vacuum of 133 Pa or less until the intrinsic viscosity becomes 0.66. The intrinsic viscosity was adjusted by measuring the torque of the agitator. The intrinsic viscosity of the polymer was measured in o-chlorophenol at 25 ° C.

  The obtained polymer was cut into chips and the polyethylene terephthalate dried at 180 ° C. for 5 hours was used and taken up at a spinning speed of 2800 m / min. Then, the polymer was wound up under stretching conditions that changed the boiling water shrinkage rate. . The obtained drawn yarn is used for warp and weft to make a high-density fabric with a cover factor of WCF = 1700 and FCF = 1150, and the properties of the obtained fabric are shown in Table 4.

  Example 8 has a cross-sectional shape suitable for the present invention, flatness, irregularity degree I, irregularity degree II, single yarn fineness, and does not contain a matting agent, so it has an excellent refreshing feeling, harshness feeling, glossiness, and resistance to resistance. A high density fabric with water pressure was obtained.

  Example 9 has a cross-sectional shape suitable for the present invention, flatness, irregularity degree I, irregularity degree II, single yarn fineness, and does not contain a matting agent, so it has excellent refreshing feeling, harshness feeling, and glossiness. Although it has a boiling water shrinkage rate, it was a high-density fabric with a slightly low water pressure resistance.

Examples 10-12 and Comparative Examples 10-15
A curtain fabric was woven by the weaving method described above using the polyester fiber manufactured in Examples 1 to 3 and the polyester fiber manufactured so that only the fineness configuration was different as shown in Table 5. The properties of the resulting fabric are shown in Table 5.

  From the results of Table 5, Examples 10 to 12 have sufficient cross-sectional shape, flatness, irregularity degree I, irregularity degree II, and single yarn fineness, so that they have image-shielding properties and daylighting properties, and are extremely excellent in cooling. A curtain fabric having a feeling, a firm feeling and a glossy feeling was obtained. On the other hand, Comparative Examples 10 to 15 had insufficient elasticity and no glossiness.

Examples 13 and 14 and Comparative Examples 16 and 17
The curtain fabric was woven by the weaving method described above using the polyester fibers manufactured in Examples 4 and 5 and the polyester fibers manufactured so that only the fineness configuration was different as shown in Table 6. The properties of the resulting fabric are shown in Table 6.

  Examples 13 and 14 have a cross-sectional shape, flatness, irregularity degree I, irregularity degree II suitable for the present invention, and single yarn fineness is also suitable, so that they have image-shielding properties and daylighting properties, and are extremely excellent in elasticity. A curtain fabric having a feeling of sensation and gloss and an excellent refreshing feeling was obtained. On the other hand, Comparative Examples 16 and 17 were curtain fabrics that had no image-shielding properties and no daylighting properties and had a rough feeling.

Examples 15 and 16 and Comparative Example 18
A curtain fabric was woven by the weaving method described above using the polyester fibers manufactured in Examples 6 and 7 and the polyester fibers manufactured so that only the fineness configuration was different as shown in Table 7. The properties of the resulting fabric are shown in Table 7.
The obtained drawn yarn was made into a curtain fabric by the above weaving method, and the obtained properties are shown in Table 3.

  Examples 15 and 16 have a cross-sectional shape, flatness, irregularity degree I, irregularity degree II suitable for the present invention, and single yarn fineness is also suitable, so that there are image-shielding properties and daylighting properties, and extremely excellent elasticity. A curtain fabric having a feeling of sensation and gloss and an excellent refreshing feeling was obtained. However, Comparative Example 18 was a curtain fabric having no image-blocking property and daylighting property and having a rough and hard feeling.

Examples 17 and 18
The curtain fabric was woven by the weaving method described above using the polyester fibers manufactured in Examples 8 and 9 described above and the polyester fibers manufactured so that only the fineness configuration was different as shown in Table 8. The properties of the resulting fabric are shown in Table 8.

  Example 17 has a cross-sectional shape suitable for the present invention, flatness, irregularity degree I, irregularity degree II, single yarn fineness, and does not contain a matting agent, so that it has an excellent refreshing feeling, sharp feeling, glossiness and shading. A curtain fabric having image properties and daylighting properties was obtained.

  Example 18 has a cross-sectional shape suitable for the present invention, flatness, irregularity degree I, irregularity degree II, single yarn fineness, and does not contain a matting agent, so it has an excellent refreshing feeling, harshness feeling and glossiness. Although it has a boiling water shrinkage rate, it is a fabric for curtains having a slightly low image-shielding property and daylighting property.

(A), (B), (C) is sectional drawing which illustrates the single fiber cross section of the polyester fiber of this invention, respectively. (A), (B) is a top view which illustrates the discharge hole of the spinneret which respectively obtains the polyester fiber of this invention. It is the schematic which illustrates the melt spinning process of obtaining the polyester fiber of this invention. It is the schematic which illustrates the other example of the melt spinning process of obtaining the polyester fiber of this invention.

Explanation of symbols

1 Spin Pack 2 Spinneret 3 Cooling Chimney 4 Lubrication Guide 5 Interlace Nozzle 6 Take-off Roller 7 Package

Claims (11)

The single fiber fineness is 2.5 dtex or less, and the single fiber cross-sectional shape is a flat multilobal shape having six to ten leaves, and the longest major axis connecting the vertices of the circumscribed circle of the flat multilobal shape is A and the major axis A Among the short diameters that are perpendicular to each other and connect the apexes of the convex portions of the flat multilobal shape, B is the largest short diameter, C is the shortest diameter that is the same or the second longest short diameter B, and the flat multileaf shape. Polyester consisting of a single fiber satisfying the following formula, where D is the shortest short diameter of the short diameters connecting the bottoms of the recesses, and the glossiness of the single fiber is 35 to 70 fiber.
Flatness (A / B) = 1.2 to 2.2
Deformation degree I (C / D) = 1.1 to 1.3
Deformation degree II (B / D) = 1.1 to 1.6
A> B ≧ C> D The polyester fiber contains 2 to 20% by weight of calcium element and 2 to 20% by weight of phosphorus element, and 1600 cm ⁻ when the stretching vibration of the double bond of the carbonyl group is adjacent to the metal in the infrared absorption spectrum. ^The content of the internal particles having substantially no absorption of ¹ is 0.03 to 0.5% by weight, and the birefringence of the polyester fiber is 13 × 10 ⁻³ to 80 × 10 ^−3. The polyester fiber according to 1.   The polyester fiber according to claim 1 or 2, which has a boiling water shrinkage of 5% or less.   The polyester fiber according to claim 1, 2 or 3, wherein the total fineness is 56 to 167 dtex.   The polyester fiber according to any one of claims 1 to 4, wherein the cross-sectional shape of the single fiber is a flat eight-leaf shape.   The polyester fiber according to any one of claims 1 to 5, which is used for an embroidery thread.   The polyester fiber according to any one of claims 1 to 5, which is used for an inner.   It is woven using the polyester fiber according to any one of claims 1 to 5, the cover factor WCF of warp is 1450 to 1700, the cover factor FCF of weft is 870 to 1150, and both cover factors are A high density polyester fiber woven fabric having a ratio FCF / WCF of 0.60 to 0.68.   The high-density polyester fiber fabric according to claim 8, wherein the water resistance based on JIS-L-1092A is 5.0 kPa or more. A woven or knitted fabric using the polyester fiber according to any one of claims 1 to 5, wherein the woven or knitted fabric has an Lb value of 10 to 25% and a lighting rate of 30 to 45%. . 11. The polyester fiber woven or knitted fabric for curtain according to claim 10, wherein the density of the woven or knitted fabric is 60 to 100 pieces / 25 mm in the case of a woven fabric, and 30 to 60 courses / 25 mm in the case of a knitted fabric.

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