JP2005179810A - Water-absorbing, quick-drying and see-through-proof polyester-blended product and fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a textile blend product good in see-through proofness, water-absorbing tendency and quick dryability, soft in touch feeling and satisfying stretch feeling as well. <P>SOLUTION: The textile blend product comprises polyethylene terephthalate-based fibers and polytrimethylene terephthalate-based fibers. In this product, at least the polyethylene terephthalate-based fiber contains 1-3 wt.% of a titanium oxide, has a modified cross-section degree of 2.0-5.0, has three or more recesses in the circumferential direction of the fiber, has equal or more recesses on the side opposite to the side with one or more recesses among them, has a ratio of the recess depth to fiber thickness of 0.1-1.0, and has a recess angle of 100-160°. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mixed article made of polyethylene terephthalate fiber and polytrimethylene terephthalate fiber. More specifically, the present invention relates to a blended product that takes advantage of the stretch properties of polytrimethylene terephthalate fibers, the water-absorbing quick-drying properties and the spinnability of polyethylene terephthalate fibers.

  In Japanese Patent Application No. 2002-175753, the present applicant has proposed a polyester fiber that has a soft texture, excellent water-absorbing quick-drying property and anti-slipping property. However, it has been required to further improve the comfort by taking advantage of this property and satisfying the stretchability.

  An object of the present invention is to provide a polyester fiber blended article excellent in prevention of see-through, water absorption and quick drying, a soft texture and satisfying a stretch feeling, and a fabric thereof.

  That is, the present invention is as follows.

  (1) A mixed article composed of polyethylene terephthalate fiber and polytrimethylene terephthalate fiber, wherein at least the polyethylene terephthalate fiber contains 1 to 3% by weight of titanium oxide, and the fiber section has a profile degree of 2.0 to 5. 0, having three or more valleys in the peripheral direction of the fiber, and having one or more valleys on the opposite side of the side having one or more valleys, the ratio of the valley depth to the fiber thickness being A polyester mixed article characterized by 0.1 to 1.0 and a valley angle of 100 to 160 °.

  (2) The polyester mixed article according to (1) above, wherein a fiber obtained by mixing polyethylene terephthalate fiber and polytrimethylene terephthalate fiber is used.

  (3) The polyester mixed article according to (1) above, wherein the polyethylene terephthalate fiber has a W cross-sectional structure.

  (4) A fabric comprising a mixture of the polyethylene terephthalate fiber and the polytrimethylene terephthalate fiber described in (1) above.

  The polyester mixed article of the present invention is made of polyethylene terephthalate fiber and polytrimethylene terephthalate fiber. For example, fibers made by mixing polyethylene terephthalate fibers and polytrimethylene terephthalate fibers, fabrics using mixed fibers, polyethylene terephthalate fibers and polytrimethylene terephthalate fibers are made separately, and both fibers are made at the fabric production stage. This refers to all fabrics composed of polyester fibers and polytrimethylene terephthalate fibers at least when the fabric is produced, such as fabrics. Among these, considering ease of handling, it is preferable to use a fiber in which polyethylene terephthalate fiber and polytrimethylene terephthalate fiber are mixed.

  In the present invention, the polyethylene terephthalate fiber means an ethylene terephthalate unit having about 50 mol% or more, preferably 70 mol% or more, more preferably 80 mol% or more, particularly preferably 90 mol% or more. Accordingly, the total amount of the other acid component and / or glycol component as the third component is less than about 50 mol%, preferably less than 30 mol%, more preferably less than 20 mol%, particularly preferably less than 10 mol%. Means polyethylene terephthalate contained in

  In the present invention, the polyethylene terephthalate fiber needs to have a titanium oxide concentration of 1.0 to 3.0% by weight. If it is less than 1.5%, the effect of preventing see-through is insufficient, which is not preferable. On the other hand, if it exceeds 3.0% by weight, yarn breakage or dyeing quality tends to decrease. More preferably, the titanium oxide concentration ranges from 1.5 to 2.5% by weight, and even more preferably from 1.7 to 2.3%.

  In the present invention, the polyethylene terephthalate fiber preferably has a Bingham fluid property value at 280 ° C. of 50 Pa or less. As shown in FIG. 2, the Bingham fluid characteristic value is a value when measured by the method described later, and is a value that tends to increase when fine particles such as titanium oxide are added at a high concentration. In the conventional technique for preventing see-through, a sheath core fiber is used, and a high concentration of titanium oxide is added to the core, so that the Bingham fluid characteristic value of polyethylene terephthalate as a core component tends to exceed 50 Pa. When this characteristic value is large, it means that even if a deformation stress such as a shear stress is applied to deform the polymer, the polymer does not deform until the section in FIG. 2 is crossed. This is a production method that requires elongation and deformation, which can easily cause yarn breakage and fluff.

  Further, when spinning for a long time, it becomes a cause of the occurrence of yarn breakage fluff over time. In the case of a round section as shown in the prior art or a relatively low degree of irregularity such as the degree of irregularity of this application being less than 2.0, thread breakage increases significantly even if the Bingham fluid characteristic value exceeds 50 Pa. Although there may be no case, when the cross-sectional structure as in the present application has a degree of profile of 2.0 or more, the allowable range becomes smaller, so 50 Pa or less is preferable.

  In order to achieve such a value, it is necessary that the titanium oxide content of the polyethylene terephthalate fiber be 3.0% by weight or less. The Bingham fluid characteristic value is more preferably 40 Pa or less, and further preferably 30 Pa or less.

  In the present invention, the polyethylene terephthalate fiber preferably has a melt viscosity at 280 ° C. of 1500 poise or more. When the melt viscosity is 1500 poise or less, not only is the cross-sectional shape of the present invention difficult to obtain, but yarn breakage in spinning tends to increase. More preferably, it is the range of 1500-4500poise.

  In the present invention, the degree of atypical polyethylene terephthalate fiber is a value determined according to the formula (1) from the cross section of the fiber as shown in FIG. The fiber of the present invention needs to have a profile degree of 2.0 to 5.0. If it is less than 2.0, the touch of the obtained fiber becomes hard and the effect of preventing see-through and water absorption may be insufficient, which is not preferable. On the other hand, if it exceeds 5.0, yarn breakage and fluff are likely to occur, which is not preferable. More preferably, it is 2.5-4.5, More preferably, it is 3.0-4.5.

  Among the present invention, the polyethylene terephthalate fiber has three or more valleys in the peripheral direction of the fiber cross section, and it is necessary to have the same number or one more valleys on the opposite side of the side having one or more valleys. It is. If there are only two or less valleys in the peripheral direction, water absorption and anti-through properties are insufficient. Further, by providing the same number of valleys as the one or more valleys on the side opposite to the side having one or more valleys, the gap between the filaments is reduced, and a sufficient see-through preventing effect can be exhibited even with the titanium oxide concentration of the present invention.

  In the present invention, the polyethylene terephthalate fiber needs to have a ratio of valley depth to fiber thickness of 0.1 to 1.0. The valley depth ratio is a value obtained from the equation (2) as shown in FIG. When the ratio of the valley depth is less than 0.1, the water absorption is insufficient, and the gap between the filaments is likely to be widened, and the effect of preventing see-through is insufficient. On the other hand, if it exceeds 1.0, yarn breakage and fluff are likely to occur, which is not preferable. More preferably, it is in the range of 0.2 to 0.7.

  In the present invention, the polyethylene terephthalate fiber preferably has a valley angle of 100 to 160 °. The valley angle is a value indicated by θ in FIG. Even if the valley angle is less than 100 or exceeds 160 °, the see-through preventing effect is insufficient. More preferably, the valley angle is in the range of 110 to 150 °.

  In the present invention, the polyethylene terephthalate fiber needs to have the cross-sectional characteristics as described above. In particular, a W cross-sectional structure is preferable from the viewpoint of the balance between ease of production and performance.

  In the present invention, the polyethylene terephthalate fiber can be produced by spinning at a speed of 1500 m / min and stretching by a separate process or by a direct spinning / stretching process without stretching in one process.

  When producing by the direct spinning drawing method, it is preferable to use the oiling nozzle defined in the present application. In the direct spinning method, a finish coating method such as an oiling roll is widely used. However, in order to obtain a polyethylene terephthalate fiber fiber in the present invention, the tension in the spinning process increases, and as a result, the yarn This is not preferable because the cut frequently occurs.

  The position of the oiling nozzle is preferably 2.5 m or less, more preferably 2 m or less under the spinneret in order to perform spinning with low tension and reduce yarn breakage. At this time, the yarn speed on the oiling nozzle is preferably 2000 m / min or less. If it exceeds 2000 m / min, the shavings will immediately adhere to the oiling nozzle during spinning, and the adhesion of the finish will occur. As a result, the dyeing quality tends to deteriorate, which is not preferable. The lower limit is not particularly specified, but when producing in one step, it is preferable that the lower limit is at least 1000 m / min in order not to lose efficiency.

  The oiling nozzle has a slit shape, a slit width of 1 to 5 mm, a slit height of 0.15 to 0.5 mm, and a thread contact length of 0.5 to 2 mm on the slit. This is preferable for stable spinning without reducing the dyeing quality for a long time. The slit shape means a horizontally long hole shape as shown in FIG. In this shape, if the slit width is 1 mm or less, the filament is not sufficiently spread on the nozzle, and if it exceeds 5 mm, the gap between the filaments is too wide to uniformly adhere the finishing agent. If the slit height is less than 0.15 mm, it is difficult to process a uniform slit, and clogging is likely to occur. If the slit height is 0.5 mm or more, the finish discharge speed is insufficient and uniform finish adhesion cannot be performed. If the thread contact length on the slit is less than 0.5 mm, the filament will not easily spread on the nozzle, and the roll will be large and stable and the finish will not adhere. On the other hand, if it is 2 mm or more, the oiling nozzle will be used for spinning. The shavings adhere immediately to the top, and the adhesion of the finish tends to occur.

  In the present invention, the polytrimethylene terephthalate fiber refers to a polyester fiber having a trimethylene terephthalate unit as a main repeating unit. The trimethylene terephthalate unit is about 50 mol% or more, preferably 70 mol% or more, more preferably 80 mol. % Or more, particularly preferably 90 mol% or more. Accordingly, the total amount of the other acid component and / or glycol component as the third component is less than about 50 mol%, preferably less than 30 mol%, more preferably less than 20 mol%, particularly preferably less than 10 mol%. Means polytrimethylene terephthalate contained in

  As a preferable characteristic of the polytrimethylene terephthalate fiber, the strength is 2 to 5 cN / dtex, preferably 2.5 to 4.5 cN / dtex, and more preferably 3 to 4.5 cN / dtex.

  The elongation is 30 to 60%, preferably 35 to 55%, more preferably 40 to 55%.

  The elastic modulus is 30 cN / dtex or less, preferably 10 to 30 cN / dtex, more preferably 12 to 28 cN / dtex, and particularly preferably 15 to 25 cN / dtex.

  The elastic recovery at 10% elongation is 70% or more, preferably 80% or more, more preferably 90% or more, and most preferably 95% or more.

  Polytrimethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this synthesis process, an appropriate one or two or more third components may be added to form a copolymer polyester, or a polyester other than polytrimethylene terephthalate such as polyethylene terephthalate or polybutylene terephthalate, nylon and polytrimethylene. After synthesizing methylene terephthalate separately, blending (the content of polytrimethylene terephthalate during blending is 50% or more by mass) or at least one by composite spinning (eccentric sheath core, side-by-side, etc.). It is good also as a latent crimp expression polyester fiber in which a component consists of polytrimethylene terephthalate.

  With respect to composite spinning, the first component is a polytrimer as exemplified in Japanese Patent Publication No. 43-19108, Japanese Patent Application Laid-Open No. 11-189923, Japanese Patent Application Laid-Open No. 2000-239927, Japanese Patent Application Laid-Open No. 2000-256918, and the like. There are methylene terephthalates, and the second component is a composite spinning of side-by-side type or eccentric seascore type in which polyester, nylon such as polytrimethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, etc. are arranged in parallel or eccentrically. In particular, a combination of polytrimethylene terephthalate and copolymerized polytrimethylene terephthalate or a combination of two types of polytrimethylene terephthalate having different intrinsic viscosities is preferable. In particular, the intrinsic viscosity as exemplified in JP-A-2000-239927 Using two different types of polytrimethylene terephthalate, a composite spun into a side-by-side type with a curved joint surface so that the low-viscosity side wraps around the high-viscosity side combines high stretchability and bulkiness. Especially preferred.

  The difference in intrinsic viscosity between the two types of polytrimethylene terephthalate is preferably 0.05 to 0.4 (dl / g), particularly 0.1 to 0.35 (dl / g), and further 0.15 to 0. .35 (dl / g) is preferable. For example, when the intrinsic viscosity on the high viscosity side is selected from 0.7 to 1.3 (dl / g), the intrinsic viscosity on the low viscosity side is selected from 0.5 to 1.1 (dl / g). Is preferred. In addition, the intrinsic viscosity on the low viscosity side is preferably 0.8 (dl / g) or more, particularly 0.85 to 1.0 (dl / g), more preferably 0.9 to 1.0 (dl / g). .

  In addition, the intrinsic viscosity of the composite fiber itself, that is, the average intrinsic viscosity is preferably 0.7 to 1.2 (dl / g), and more preferably 0.8 to 1.2 (dl / g). In particular, 0.85 to 1.15 (dl / g) is preferable, and 0.9 to 1.1 (dl / g) is more preferable.

  In addition, the value of the intrinsic viscosity as used in the present invention refers to the viscosity of the yarn being spun, not the polymer used. The reason for this is that polytrimethylene terephthalate has a disadvantage inherent to thermal decomposition as compared with polyethylene terephthalate and the like, and even if a polymer with a high intrinsic viscosity is used, the intrinsic viscosity is significantly reduced by thermal decomposition. This is because it is difficult to maintain a large difference in intrinsic viscosity between the two.

  There are no particular limitations on the composite ratio of the two polyester components (generally many are in the range of 70/30 to 30/70 by mass%) and the joining surface shape (there is a straight or curved shape). The total fineness is preferably 20 to 300 dtex, and the single yarn fineness is preferably 0.5 to 20 dtex.

  Third components to be added include aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexanedicarboxylic acid, etc.), aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.), fat Aliphatic glycols (ethylene glycol, 1,2-propylene glycol, 1,4-butanediol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanedimethanol, etc.), aliphatic glycols containing aromatics (1,4-bis (Β-hydroxyethoxy) benzene, etc.), polyether glycol (polyethylene glycol, polypropylene glycol, etc.), aliphatic oxycarboxylic acid (ω-oxycaproic acid, etc.), aromatic oxycarboxylic acid (P-oxybenzoic acid, etc.), etc. There is. A compound having one or three or more ester-forming functional groups (such as benzoic acid or glycerin) can also be used within the range where the polymer is substantially linear.

  In addition, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, easy lubricants such as aerosil, antioxidants such as hindered phenol derivatives, difficulty A flame retardant, antistatic agent, pigment, fluorescent whitening agent, infrared absorber, antifoaming agent, and the like may be contained.

  In the present invention, for the spinning of polytrimethylene terephthalate fiber, after obtaining an undrawn yarn at a winding speed of about 1500 m / min, a method of spinning about 2 to 3.5 times, a spinning-twisting step Either a direct-coupled straight-rolling method (spin draw method) or a high-speed spinning method (spin take-up method) with a winding speed of 5000 m / min or more may be employed.

  Further, the form of the fiber may be long fiber or short fiber, and may be uniform or thick in the length direction, and round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped in cross section , Yaba type, flatness (with flatness of about 1.3-4, W type, I type, Boomerang type, wave type, skewer type, eyebrows type, rectangular parallelepiped type, etc.), dog bone type A polygonal shape such as a multi-leaf shape, a hollow shape, or an indeterminate shape may be used.

  Furthermore, the yarn forms include ring spun yarn, open-end spun yarn, air jet fine spun yarn, multifilament yarn (including ultrafine yarn) with a single yarn denier of about 0.1 to 5 denier, sweet There are twisted yarns to strong twisted yarns, false twisted yarns (including POY drawn false twisted yarns), air jet yarns, indented yarns, knitted knitted yarns, and the like.

  In the present invention, the polytrimethylene terephthalate fiber (A) and the polyethylene terephthalate fiber (B) are combined, and the preferable composite ratio (A / B; mass%) of both is 10 to 90/90 to More preferably, 20 to 80/80 to 20, more preferably 30 to 70/70 to 30, particularly 40 to 60/60 to 40 is optimal.

  As a composite means, it is possible to combine at the yarn stage as a blend (mixed cotton, fleece blend, sliver blend, core yarn, silospan, silofill, hollow spindle, etc.), entangled blend (high shrinkage yarn or different shrinkage blend yarn) Mixed yarn, etc.), cross twist, design twist yarn, covering (single, double), composite false twist (simultaneous false twist, pre-twist false false twist (first twist same direction false twist or different twist false twist), difference in elongation There are means such as false twisting, phase difference false twisting, fusion false twisting), post-mixing after false twisting, and 2-feed (simultaneous feed or feed difference) air injection processing.

  As a means of compounding on the machine, there is a general knitting and weaving. For example, in knitting, the yarns are aligned and fed, or double knitted fabric (for example, double circular knitting machine, double flat knitting machine, double raschel) In a warp knitting machine, there is a method of feeding yarns on the front surface and / or the back surface, respectively, or feeding them together. In union weaving, one is used for warp and the other is used for weft. In warp and / or weft, one to three are alternately arranged by warping or weft insertion. The other constitutes a raised portion and a pile portion, or is mixed to constitute a ground tissue, raised portion, etc., and the front and / or back surfaces of the double woven fabric are configured or mixed. Further, a combination of these various yarn stages and a combination on the machine may be combined.

  The knitted fabric using the mixed article of the present invention has a soft texture, excellent water-absorbing quick-drying property, anti-permeability, and excellent stretch properties, and therefore has excellent overall comfort.

  Hereinafter, the present invention will be described more specifically with reference to examples.

The measurement method in the examples was measured by the following method.
(Atypical degree, ratio of valley depth and valley angle)
The filament was embedded in paraffin, a cross section of the filament was cut out with a microtome, the section was observed with an optical microscope at a magnification of 200 times, a cross section of the filament was taken, and the cross section was stretched 3 times. The lengths of a and b were measured according to FIG. 1 from the obtained photographs, and the degree X of variant was calculated according to the formula (1). The valley depth ratio Y was calculated according to equation (2) by measuring the length c according to FIG. The trough angle was measured from the tangent obtained according to FIG.

X = b / a (1)
Y = c / a (2)
(Melt viscosity and Bingham fluid characteristic values)
Using a Toyo Seiki Capillograph, the barrel temperature was set to 280 ° C., and a round hole capillary with a hole diameter of 1.0 mm and a length of 100 mm was used to measure the melt viscosity and Bingham fluid property values of the polyester. At this time, 10 minutes after the capillary was inserted and 10 minutes after the polymer was inserted into the barrel, the shear rate was changed in five steps of 6.08, 12.2, 24.2, 36.5, 60.8 sec ⁻¹ and the shear stress was measured. The obtained measured values were plotted as shown in FIG. 2, and a straight line was obtained according to the least square method. From the obtained straight line, the shear stress at a shear rate of 0 was defined as a Bingham fluid characteristic value. The melt viscosity was determined by using the slope of the obtained straight line as the melt viscosity.
(Strength and elongation)
Strength and elongation were obtained with USTER-TENSORAPID-3 manufactured by Zerbegger Worcester at a yarn length of 500 mm and a pulling speed of 500 mm / min. The elongation was determined as the elongation, which is the ratio of the length until the break to the 500 mm yarn length.
(Water absorption)
The obtained woven fabric was washed in an aqueous solution of score roll 400 2 g / l manufactured by Kao Corporation for 15 minutes, washed with water for 30 minutes, dehydrated, and dried at 70 ° C. for 15 minutes. After drying, 0.5% by weight of Dianix Red AC-E manufactured by Dystar Japan as a dye, Nikkasan Salt 7000 0.5g / l manufactured by Nikka Chemical Co., Ltd. 5% by weight SR1000 manufactured by Takamatsu Yushi Co., Ltd. as a water absorbing agent, An aqueous solution adjusted to pH 4.5 with acetic acid or sodium acetate was prepared. It is immersed in the ratio of the weight ratio of the tubular knitted fabric 1 in this solution 30, heated up to 130 ° C at 2 ° C / min, treated at 130 ° C for 30 minutes, cooled, and the taken-out tubular knitted fabric washed with water And dried at 70 ° C. for 15 minutes. Thereafter, the strips were cut into 2.5 cm width and 20 cm length in the warp direction, and the water absorption height after 10 minutes was measured by the Bayrec method to evaluate the water absorption. When the water absorption height was 7 cm or more, it was judged that there was good water absorption.
(soft)
The softness of the obtained woven fabric was evaluated according to the following criteria.

Evaluation criteria for softness ◎: Very soft 〇: Soft △: Slightly hard ×: Hard
(Prevention of see-through △ L)
Eight obtained raw machines were stacked, and the lightness of the fibers was measured with a color difference meter CR-210 manufactured by Minolta Camera. Next, the raw machine was placed on a blackboard and the brightness was measured.

  Thereafter, ΔL was calculated according to the following equation (3). The smaller this value, the better the anti-slipping property.

△ L = L * _w− L * _b (3)
L * _w : Brightness of raw machine
L * _b : Brightness of the living machine on the blackboard (elastic recovery rate at 10% elongation)
The fiber was attached to a tensile tester with a distance between chucks of 10 cm, stretched to a stretch rate of 10% at a pulling speed of 20 cm / min, and left for 1 minute. Then, it shrinks again at the same speed, and draws a stress-strain curve. The elongation when the stress becomes zero during shrinkage is defined as the residual elongation (A). The elastic recovery rate was determined according to the following formula.

Elastic recovery rate at 10% elongation = (10−A) / 10 × 100 (%)
(Intrinsic viscosity) Intrinsic viscosity [η] (dl / g) is a value determined based on the definition of the following equation.

Ηr in the definition is a value obtained by dividing the viscosity at 35 ° C. of a diluted polymer solution dissolved in a 0-chlorophenol solvent with a purity of 98% or more by the viscosity of the solvent measured at the same temperature, and is defined as a relative viscosity. It is what has been. C is the polymer concentration expressed in g / 100 ml.
(Textile elongation)
It was measured by the elongation rate A method (constant speed elongation method) of JIS L-1096.
(Production Example 1)
Two types of polytrimethylene terephthalate having different intrinsic viscosities were extruded into a side-by-side mold at a ratio of 1: 1 to obtain an undrawn yarn at a spinning temperature of 265 ° C. and a spinning speed of 1500 m / min, and then a hot roll temperature of 55 ° C. and a hot plate temperature of 140 A side-by-side type composite multifilament of 56 dtex / 24f was obtained by setting the drawing temperature to 400 ° C./min and the draw ratio to 56 dtex so that the fineness after drawing was 56 dtex. The intrinsic viscosity of the obtained composite multifilament was [η] = 1.30 on the high viscosity side and [η] = 0.90 on the low viscosity side.

  In addition, since it is difficult to measure the intrinsic viscosity of each composite multifilament using polymers having different intrinsic viscosities, two types of polymers are used under the same spinning conditions as the composite multifilament. The intrinsic viscosity measured using the yarn obtained by spinning alone was used as the intrinsic viscosity constituting the composite multifilament.

The tensile strength, elastic modulus, and elastic recovery rate at 10% elongation of the drawn yarn were 2.6 cN / dtex, 40%, 20 cN / dtex, and 99%, respectively.
(Production Example 2)
Similar fibers were obtained in Production Example 1 except that [η] = 0.90 on the high viscosity side and [η] = 0.70 on the low viscosity side. The tensile strength, elastic modulus, and elastic recovery rate at 10% elongation of the drawn yarn were 2.4 cN / dtex, 40%, 20 cN / dtex, and 98%, respectively.
(Production Example 3)
Two types of polyethylene terephthalate having different intrinsic viscosities are extruded into a side-by-side mold at a ratio of 1: 1 to obtain an undrawn yarn at a spinning temperature of 295 ° C. and a spinning speed of 1500 m / min, then a hot roll temperature of 85 ° C. and a hot plate temperature of 140 ° C. The drawing speed was set to 800 m / min, and the draw ratio was set so that the fineness after drawing was 56 dtex, and then twisted to obtain a 56 dtex / 24 f side-by-side composite multifilament. The intrinsic viscosity of the obtained composite multifilament was [η] = 0.63 on the high viscosity side and [η] = 0.50 on the low viscosity side.

The tensile strength, elastic modulus, and elastic recovery at 10% elongation of the drawn yarn were 2.8 cN / dtex, 30%, 88 cN / dtex, and 72%, respectively.
(Production Example 4)
The spinning temperature was set to 295 ° C, and the 1GD temperature was set to 95 ° C and the 2GD temperature was set to 130 ° C while applying cold air by side blowing. The taper GD with a taper ratio of 3% was used for 1GD, and the titanium oxide concentration was 2% by weight. Polyethylene terephthalate having a viscosity of 1900 poise and a Bingham fluid property value of 25 Pa was wound while spinning and drawing in one step at a 2GD speed of 4305 m / min and a winding speed of 4258 m / min to obtain a fiber having a cross-sectional shape of 56 dtex / 24 f in FIG. The obtained fiber had a profile X of 3.4, a valley depth ratio Y of 0.3, a valley angle θ of 138 °, a strength of 3.5 cN / dtex, and an elongation of 32%.
(Production Example 5)
Polyethylene terephthalate fibers were obtained by spinning in the same manner as in Production Example 3 except that the titanium oxide concentration was 0.4% and polyethylene terephthalate having a Bingham fluid characteristic value of 8 Pa was used. The obtained fiber had a profile X of 3.4, a valley depth ratio Y of 0.3, a valley angle θ of 138 °, a strength of 3.6 cN / dtex, and an elongation of 33%.
(Production Example 6)
Spinning was performed in the same manner as in Production Example 3 except that the titanium oxide concentration was 0.4%, polyethylene terephthalate having a Bingham fluid characteristic value of 8 Pa, a melt viscosity of 1900 poise, and a round cross section at a 2GD speed of 4920 m / min and a winding speed of 4820 m / min. Thus, polyethylene terephthalate fiber was obtained. The strength was 4.2 cN / dtex, and the elongation was 32%.
[Examples and Comparative Examples]
As shown in Table 1, the A fiber and the B fiber were interlaced (air pressure 0.3 MPa) to give entanglement of 70 pieces / m. Next, a twisted yarn (A) is formed by twisting with a twist of 1200 T / m (twisting coefficient 14199) in the S direction with a double twister to produce a twisted yarn (B) in the Z direction. X A twist set for 40 minutes was performed.

  Weft yarn (A) and twisted yarn (B) are alternately used as weft yarns, 56 dtex / 24f polyethylene terephthalate raw yarn is used as warp yarns, and 2/2 twill fabric is woven in an air jet loom (warp yarn CF = 1300, weft CF = 940). This raw machine was scoured with an open soaper, dyed and finished (warp CF = 1890, weft CF = 1060). Table 1 shows the evaluation results of the obtained woven fabric.

  The examples showing the mixed fibers of the present invention have good water absorption, anti-slipping properties, extensibility, and softness, while the comparative examples of the prior art are inferior in any characteristics.

It is a figure which shows one example of the yarn cross-section of this invention. It is a figure which shows the calculation method of a Bingham fluid characteristic value and melt viscosity. It is a figure which shows one example of the oiling nozzle structure of this invention.

Claims (4)

  A mixed article composed of a polyethylene terephthalate fiber and a polytrimethylene terephthalate fiber, wherein at least the polyethylene terephthalate fiber contains 1 to 3% by weight of titanium oxide, and has a fiber cross-section of 2.0 to 5.0. Yes, with 3 or more valleys in the peripheral direction of the fiber, with the same or more valleys on the opposite side of the side having 1 or more valleys, and the ratio of the valley depth to the fiber thickness is 0.1 to Polyester mixed article characterized by 1.0 and valley angle of 100-160 °.   The polyester blend according to claim 1, wherein a fiber obtained by mixing polyethylene terephthalate fiber and polytrimethylene terephthalate fiber is used.   2. The polyester blend according to claim 1, wherein the polyethylene terephthalate fiber has a W cross-sectional structure.   A fabric comprising a mixture of the polyethylene terephthalate fiber and the polytrimethylene terephthalate fiber according to claim 1.

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