WO2001000912A1

WO2001000912A1 - Preliminarily twisted and false twisted yarn

Info

Publication number: WO2001000912A1
Application number: PCT/JP2000/004158
Authority: WO
Inventors: Mitsuyuki Yamamoto; Tokio Okuno
Original assignee: Asahi Kasei Kabushiki Kaisha
Priority date: 1999-06-25
Filing date: 2000-06-23
Publication date: 2001-01-04
Also published as: AU5569000A; JP3444871B2; TW495570B

Abstract

A preliminarily twisted and false twisted yarn, characterized in that the yarn comprises multifilaments of polytrimethylene terephthalate fibers and the multifilaments are preliminary twisted in a different direction from that of a false twisting. The preliminarily twisted and false twisted yarn can be used for manufacturing a fabric which is excellent in stretching property and the recovery from an extended state and has a soft feeling.

Description

Description Yarn false twisted yarn Technical field

The present invention relates to a polyester twisted false twisted yarn, a composite twisted false twisted yarn, a composite twisted yarn, and a fabric. More specifically, the present invention provides a twisted false twisted yarn, a composite twisted false twisted yarn, and a composite textured yarn that are excellent in soft texture and elongation recovery and are suitable as materials for stretching. Is the thing. Furthermore, the present invention relates to a fabric using these processed yarns, the fabric having excellent stretchability and excellent elongation recovery. Background art

Hitherto, as a polyester fiber having excellent elongation recovery properties and suitable for stretch materials, for example, Japanese Patent Application Laid-Open No. 9-83873 discloses a main component comprising polypropylene terephthalate. A polyester false twisted yarn is proposed. This processed yarn has the characteristic of being excellent in elongation / recovery and having a low Young's modulus as compared with regular polyester, and is therefore soft.

However, when viewed as a stretch material, the stretch recovery is not at a sufficient level, and when used as a warp and a warp or a weft, the fabric has poor stretch recovery. . Therefore, there is a demand for a material having further excellent elongation recovery. Disclosure of the invention

The present invention provides a twisted false-twisted yarn and a composite twisted false-twisted yarn which are excellent in soft texture, stretchability and elongation recovery, and are suitable as a material for stretch. The purpose of the present invention is to provide a fabric having excellent stretchability and elongation recovery by using these yarns for fabric. I do.

The present inventors have conducted intensive studies on various polyester-based false twisting processes.As a result, the use of a specific fiber and a specific twisted false-twisted processed yarn has made it possible to improve the conventional technology. However, they have found that a fabric having extremely excellent stretchability and elongation recovery properties can be obtained, and have completed the present invention.

That is, the present invention is as follows.

1. Pre-twisted false twisted yarn composed of multifilament multi-filament multifilaments, the twist direction of the pre-twist and the twist direction of the false twist are different. A pre-twisted false twisted yarn, characterized in that:

2. A composite twisted false twisted yarn composed of multifilament and multifilament fibers and other fibers, the twist direction of false twist and the twist direction of false twist. Are in different directions, and the content of the other fibers in the composite twisted false twisted yarn is less than 8 O wt%.

3. A composite yarn comprising the twisted false twisted yarn described in 1 above and another fiber, wherein the content of the other fiber in the composite yarn is less than 50 wt%. And composite processing yarn.

4. At least one of the pre-twisted false twisted yarn described in 1 above, the composite pre-twisted false twisted yarn described in 2 above, and the composite processed yarn described in 3 above, as warp and Z or weft. A cloth characterized by being used.

5. The twisted false twisted yarn according to 1 above, wherein the coefficient K 1 of the number of twists calculated by the following formula (I) is not less than 2700 and not more than 1400.

K 1 = T 1 X [Yarn fineness (dt ex)] ^1/2 … (I)

(However, in the above formula (I), T 1 is the number of twists per unit length (T / m). )

6. The coefficient K1 of the number of twists calculated by the following equation (I) is 2700 or more and 1400 or less, and the coefficient of the number of false twists calculated by the following equation (II) is 2 0

The false twisted yarn of the preceding machine according to 1 above, which is not less than 0000 and not more than 350 000

Κ 1 = Τ 1 X [fineness of yarn (dtex)] ^1/2 … (I)

(However, in the above formula (I), T 1 represents the number of twists per unit length (T / m).)

K 2 = (T 2 — T 1) X [Fiber fineness (dtex)] ^1/2 … (II) (In the above formula (II), T 1 is the number of twists per unit length (T / m). T 2 indicates the number of false twists per unit length (T / m).

7. Manufacture of a pretwisted false twisted yarn including a process of twisting a multifilament polyethylene terephthalate fiber multifilament yarn and then false twisting in a direction different from the twist direction of the twist. Method.

8. The coefficient 先 1 of the number of twists calculated by the following formula (I) is 2700 or more,

8. The method for producing a twisted false-twisted yarn according to 7 above, wherein the yarn is 140,000 or less.

Κ 1 = Τ 1 X [fineness of yarn (dtex)] ^1/2 … (I)

9. The coefficient K 1 of the number of twists calculated by the following equation (I) is 2700 or more and 1400 or less, and the coefficient K 2 of the number of false twists calculated by the following equation (Π) is 2 8. The method for producing a twisted false twisted yarn according to the above item 7, wherein the yarn has a value of not less than 000 and not more than 350,000.

K 1 = T 1 X [fineness of thread (dtex)] ^1/2 … (I)

K 2 = (T 2-T 1) X [Thread fineness (dtex)] ^1/2 … (II) (However, in the above formula (II), T 1 indicates the number of twists per unit length (T / m), and T 2 indicates the number of false twists per unit length (T / m).)

Hereinafter, the present invention will be described in detail.

In the present invention, the polymethylene terephthalate fiber refers to a fiber composed of a polyester having a trimethylene terephthalate unit as a main repeating unit, and the polyester is a trimethylene terephthalate fiber. It has a unit of about 50 mol% or more, preferably 70 mol% or more, more preferably 80 mol% or more, and still more preferably 90 mol% or more. . Therefore, the total amount of the other acid component and the Z or glycol component as the third component is about 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less. And more preferably polytrimethylene terephthalate contained in a range of 10 mol% or less.

Polymethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof under appropriate reaction conditions in the presence of a catalyst. You. In this synthesis process, an appropriate one or more third components may be added to obtain a copolymerized polyester. In addition, a blend of polymethylene terephthalate and a polyester other than polymethylene terephthalate such as polyethylene terephthalate, or a polyamide, or a composite spinning thereof (Sheathed core, side by side, etc.).

The third components to be added include aliphatic dicarboxylic acids (eg, oxalic acid, adipic acid), alicyclic dicarboxylic acids (eg, cyclohexanedicarboxylic acid), and aromatic dicarboxylic acids (eg, isophthalic acid, sodium sulfoisovium). Talic acid, etc.), aliphatic glycols (ethylene glycol, 1,2—propylene glycol, tetramethylen glycol, etc.), alicyclic glycols Coal (cyclohexane dimethanol), aliphatic glycols containing aromatics (1,4—bis (5—hydroxyethoxy) benzene, etc.), polyether glycol (polyethylene glycol) Chole, polypropylene glycol, etc.), aliphatic oxycarboxylic acids (ω-oxycarboxylic acid, etc.), and aromatic oxycarboxylic acids (Ρ-oxybenzoic acid, etc.).

Compounds having one or more ester-forming functional groups (such as benzoic acid or glycerin) can also be used in a range where the polymer is substantially linear.

In addition, an anti-glazing agent such as titanium dioxide, a stabilizer such as phosphoric acid, an ultraviolet absorber such as a hydroxybenzophenone derivative, a crystallization nucleating agent such as talc, a lubricating agent such as aerosil, and a hinder It may contain an antioxidant such as a dophenol derivative, a flame retardant, an antistatic agent, a pigment, a fluorescent brightener, an infrared absorber, an antifoaming agent, and the like.

In the present invention, in the case of spinning polymethylene terephthalate fiber, after obtaining an undrawn yarn at a winding speed of about 1500 mZ, it is twisted at a rate of about 2 to 3.5 times. No matter which method is used, the direct drawing method (spin draw method) directly connecting the spinning and drawing process and the high-speed spinning method (spin take-up method) with a winding speed of 500 m / min or more are adopted. good.

The fiber is in the form of a multifilament yarn, which may be uniform or thick in the length direction. The cross section may be round, triangular, L-shaped, or T-shaped. , Y-shape, W-shape, Yatsuha-shape, flat, dog-bone-shape and other polygonal shapes, multi-leaf shapes, hollow shapes and irregular shapes may be used.

It is preferable that the polymethylene terephthalate fiber used in the present invention has a single yarn fineness (dtex) of about 0.1 to 5 dtex. If the single yarn fineness is less than 0.1 dte X, the yarn breaks during false twisting and the workability decreases, and if it is larger than 5 dte X Tends to have a hard texture.

The preferred fiber physical properties of the polytrimethyl terephthalate fiber used in the present invention have a strength of preferably 2.6 c NZ dtex or more, more preferably 2.6 to 50,000 dtex. c NZ dtex. If it is less than 2.6 cN / dtex, the strength after processing tends to be low. The elongation is preferably 35% or more, and more preferably 35 to 60%. If it is less than 35%, the frequency of yarn breakage during false twisting tends to increase. The elastic modulus is preferably 27 cNZ dtex or less, more preferably 17 to 27 cN / dtex. If it exceeds 27 c / dtex, the fabric tends to have poor softness. The elongation recovery rate at 10% elongation is preferably 90% or more, and more preferably 90 to 100%. If it is less than 90%, the rate of recovery from elongation when used for fabric tends to be poor.

In the present invention, false twisting is performed using the above-described yarn. It is necessary to make the twist directions of the first twist and the false twist different from each other. If the twist directions are the same, a spiral core structure of the processed yarn described later is not formed, and when the fabric is formed, the stretchability is low. Is not appropriate.

In the production of false twisted twisted yarn, surprisingly, it is not possible to improve stretchability and elongation recovery for the first time by changing the twist direction of the false twist and false twist. A spiral core structure, which is an extremely effective form, can be formed, and a decrease in the strength of the processed yarn can be suppressed to a small extent.

It is not clear why the obtained processed yarn has excellent stretchability and elongation recovery properties, and the strength reduction can be suppressed to a small extent, but it is necessary to adopt a spiral core structure with a uniform fiber morphology. As a result, a spring effect is produced, so high stretchability and stretch recovery can be obtained. It is also presumed that stress concentration at the time of fiber breakage can be prevented.

In addition, since the twisted false twisted yarn also has the effect of improving the snagging resistance since it has a real twist, its suitability as a fabric is 问 ■ o

In order to improve the stretchability and elongation recovery properties, the inventors of the present invention have performed additional combustion processing on the false twisted yarn of polymethylene terephthalate filament. The method of steam setting was studied, but the stretch recovery was improved, but the stretchability was slightly insufficient, and the strength of the obtained processed yarn was greatly reduced. When used for weft yarns, the problem of insufficient tear strength became apparent.

As a method of the false twisting process, it is generally preferable to use a twisting false twisting machine that continuously performs the twisting process and the false twisting process. A separate two-step method may be used. In this case, after the first twisting, it is preferable to perform a twisting set at a temperature of 60 to 90 ° C. for 30 to 60 minutes by a method such as steam setting.

As the false twisting method, any method such as a pin type, a friction type, a double belt type, and an air twisting type may be used, but a more uniform crimped state can be obtained. The pin type is preferred because it is easy.

To obtain a pretwisted false twisted yarn with an elongation recovery rate of 90% or more at 10% elongation described later, the heat setting temperature during false twisting is 150 ° C or more and 190 ° C The following range is preferable. If the heat setting temperature exceeds 190 ° C, thread breakage tends to occur, and if the heat setting temperature is lower than 150 ° C, the elongation recovery rate decreases, and the stretch as stretch material Recoverability may be insufficient.

The number of twists (T 1) is determined by the coefficient K 1 of the number of twists calculated by the following equation (I). It is preferably in the range of 2700 to 1400, more preferably in the range of 4500 to 1200. If the coefficient K 1 of the number of twists is less than 270, the stretchability and elongation recovery of the resulting fabric tend to be low. If the coefficient of the number of twists exceeds 1400, which is too strong, the obtained fabric has a strong twist yarn tone and a hard texture, and the stretchability tends to decrease.o

K 1 = T 1 X [Yarn fineness (dtex)] ^1/2 … (I)

In addition, the number of false twists (T 2) is preferably such that the value of the coefficient K 2 of the number of false twists calculated by the following equation (II) is 20000 to 350.000. Preferably it is in the range of 2500 to 32000. If the coefficient K2 of the number of false twists is less than 20000, the crimpability of the obtained processed yarn tends to be insufficient, and the stretchability tends to decrease. Thread breakage in the twisting process tends to increase.

K 2 = (T 2-T 1) X [fineness of thread (dtex)] ^1/2 (II) (where, in the above formula (II), T 1 is the number of twists per unit length (T / m). T 2 indicates the number of false twists per unit length (T / m).

Next, the composite twisted false twisted yarn composed of multifilament of polymethylene terephthalate fiber and multifilament of other fibers in the present invention will be described.

As for the composite twisted false twisted yarn, the twist direction of the false twist and the twist direction of the false twist need to be different from each other, similarly to the above described twisted false twisted yarn. If the direction is the same, a spiral core structure is not formed, and when the fabric is used, sufficient stretchability cannot be obtained, which is not appropriate.

The composite twisted false twisted yarn of the present invention is obtained by twisting a polytrimethylene terephthalate fiber multifilament and other fibers and then twisting. It is false twisted, and aims to combine the stretchability with the texture and function of other fibers. The other fibers referred to here are polyester fibers other than polymethylene terephthalate, polyamide fibers, cellulose fibers, acetate fibers, acryl fibers, etc. Particularly preferred is cellulosic fiber because it can impart insufficient moisture absorption.

The ratio of the multifilament of the other fibers to the composite twisted false twisted yarn of the present invention is required to contain less than 80 wt% of the other fibers with respect to the total mass of the fibers. Is 30 to 7 O wt%. If the ratio of other fibers is 80 wt% or more, the elongation-recovery tends to deteriorate, which is not preferable.

In order to stably produce the composite twisted false twisted yarn of the present invention, the multifilament of poly (methylene terephthalate) fiber and the multifilament of other fibers are required in the step before the twisting. After aligning the nets, it is preferable to apply air blending such as interlace, so that trouble such as yarn breakage in the false twisting step can be reduced.

In the composite twisted false twisted yarn of the present invention, the false twist conditions such as the heat setting temperature, the number of twists, and the coefficient of the false twist during the twist twisting are as follows. For the same reason as in the case of pre-twisting false twisting of left-lay fiber multifilament, the heat setting temperature is preferably 150 to 190 ° C, more preferably 1 to 90 ° C, respectively. 60 to 180 ° C, the coefficient of the number of twists is preferably 2700 to 1400, more preferably 450 to 1200, and the number of false twists The coefficient is preferably from 20000 to 350.000, and more preferably from 2500 to 32000.

Next, a description will be given of a composite processed yarn characterized by combining other fibers with the pretwisted false twisted yarn of the polytrimethyl terephthalate fiber multifilament of the present invention. The purpose of the composite textured yarn of the present invention is to achieve excellent stretchability of the twisted false twisted textured yarn of the polymethylene terephthalate fiber multifilament and the texture and texture of other fibers. It is compounding with functions. Other fibers that can be combined include polyester fibers other than polymethylene terephthalate fibers, polyamide fibers, cellulose fibers, acetate fibers, acryl fibers, and the like. Cotton, wool, and the like can be mentioned, and cellulose fibers, cotton, and wool are particularly preferable in that they can impart insufficient hygroscopicity to synthetic fibers.

The proportion of other fibers in the composite processed yarn of the present invention needs to be less than 50 wt% per total fiber mass. If the content is 5 O wt% or more, it tends to be difficult to make the yarn uniform by compounding. More preferably, it is 20 to 3% by weight.

In producing the composite textured yarn of the present invention, a method of compounding a multifilament of another fiber with a pretwisted false twisted textured yarn of the polytrimethylethylene refractory fiber multifilament is used. For example, simply twisting the pre-twisted twisted yarn and other fibers, then blending and combining them by air entanglement such as interlacing, or loosening the pre-twisted false twisted yarn by slightly over-feeding it. It is possible to adopt a method in which the fibers are aligned with other fibers in a loose state, and then mixed by interlace or the like. However, the latter method is more preferable in that yarn uniformity can be obtained.

Pre-twisted false twisted yarn, polytrimethylene terephthalate fiber multifilament, and other fiber multifilament of the polymethylentelephthalate fiber multifilament of the present invention. Composite twisted yarn composed of the above-mentioned composite yarn and composite yarn obtained by compounding the above-described false-twisted false twisted yarn with other fibers (hereinafter, these may be collectively referred to simply as the processed yarn of the present invention). The preferred fiber physical properties of the above are those having a strength of preferably 2.5 cN / dtex or more, more preferably 2.5 to 5. OcN / dtex. If it is less than 2.5 cN / dtex, there is a tendency that the strength of the fabric is insufficient.

The elongation is preferably 20% or more, and more preferably 20 to 60%. If it is less than 20%, the stretchability tends to be insufficient when formed into a fabric. The elastic modulus is preferably 27 c NX d tex or less, more preferably 13 to 25 c NZ d tex. If it exceeds 27 c NZ dtex, the fabric tends to have poor softness. The stretch ratio is preferably 80% or more, and more preferably 90% or more. If it is less than 80%, the stretchability of the fabric tends to be insufficient. The elongation recovery rate at 10% elongation is preferably 85% or more, and more preferably 90 to 100%. If it is less than 85%, the rate of recovery from elongation when used for fabrics tends to be poor.

The fabric of the present invention is obtained by using at least one selected from the above-mentioned processed yarn of the present invention for the warp and Z or weft, and the form of the fabric includes a woven fabric and a knitted fabric.

In the fabric of the present invention, at least one selected from the above-mentioned false twisted twisted yarn, composite twisted false twisted yarn, and composite textured yarn is stretched only in the warp direction of the fabric. In this case, if the stretch is applied only to the weft direction, the warp is applied to the weft, and the stretch is applied to the warp and weft directions. It can be arbitrarily selected according to the purpose.

In the fabric of the present invention, the mixing ratio of each of the processed yarns to the total mass of the fabric is preferably 20 to 100 wt%, and more preferably 30 to 100 wt%. . If it is less than 20 wt%, the characteristics of stretchiness and soft texture may not be exhibited.

In the fabric, the fiber to be mixed with the processed yarn of the present invention is not particularly limited, and may be a long fiber or a short fiber, or may be a polytrimethylene. Polyester fiber such as polyethylene terephthalate fiber, polyethylene terephthalate fiber, polyamide fiber such as nylon 6, nylon 66, synthetic fiber such as acetate fiber, Cubra, Rayo Natural fibers such as cotton, hemp, wool and the like can be used. Further, the form may be a raw yarn or a bulky processed yarn represented by false twisted yarn, and conventionally known yarns in various forms can be used.

As for the mixed form, in warp and Z or weft use, for example, one or two alternates, or three or more irregular arrangements may be used. It is more preferable to use one of them or alternate one.

As the woven structure of the fabric of the present invention, a variety of changed structures derived therefrom, including a plain woven structure, a twill woven structure, and a satin woven structure, can be applied.

Examples of looms for weaving the fabric of the present invention include fluid jet looms typified by air jet-to-water jet rooms, etc., as well as revival rooms / gripper rooms and fly shears. For example, a floor room can be used. In order to maximize the stretchability in the weft direction and to reduce the variation in the stretch rate in the width direction of the fabric, weft insertion is possible with a low tension and a weft-friendly air jet. Fluid jet looms such as a hot room and a water jet room are preferred, and the suitability of an air jet room is particularly high.

Regarding the knitted fabric in the present invention, a warp knitting machine, a circular knitting machine, and a flat knitting machine are used as types of the knitting machine. Although the structure of the knitted fabric is not limited, it is particularly effective for a knitted fabric having a high stretch ratio.

In the knitted fabric of the present invention, as a method for obtaining stretchability, a knitted fabric composed of polymethylene terephthalate fiber is subjected to a relaxation heat treatment such as hot water, wet heat, or dry heat. In knitting, the course and Change the row and density balance. As a result, the stretchability is exhibited by changing the length of the tissue point, imparting a bent crimp at the intersection, and imparting a morphological change due to crimping to the floating portion of the thread. Therefore, a higher stretching ratio can be obtained by increasing the density difference between the density of the green fabric of the knitted fabric and the density of the finished knitted fabric of the final product. By knitting a knitted fabric whose coarseness has been designed in advance in advance by relaxing heat treatment to increase the shrinkage, the knitted fabric is densified, and contraction of the structure occurs in addition to shrinkage of the yarn itself. Fine bending crimps and crimps are provided in the weft direction, and desired stretchability is imparted.

As a specific method, for example, when obtaining a knitted fabric having stretchability in the weft direction, the gauge or stitch is designed to be coarse, and the greige fabric is subjected to a desired stretch before or after scouring. The width of the weft direction is set so that the width can be obtained, and the heat treatment is performed for 30 seconds to 2 minutes with dry heat of 150 to 200 ° C. Finishing in the direction gives a stretch in the weft direction. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto.

The measurement method, evaluation method, etc. are as follows.

(1) Viscosity (77 s PZC)

Dissolve the polymer in 0-cloth phenol at 90 ° C at a concentration of 1 g Z deciliter and transfer the resulting solution to an Ostwald viscometer tube at 35 ° C. C was measured and calculated by the following formula.

77 sp / C = [(Τ / Τ 0) — 1] / C

(However, T represents the falling time of the sample solution (seconds), TO represents the falling time of the solvent (seconds), and C represents the solution concentration (g Z deciliters).) (2) Strength, elongation, elastic modulus

Based on JIS-L-1013, measured with a gripping distance of 20 cm and a pulling speed of 20 cm using a tensile tester RTM-100 manufactured by Toyo Ball Window Co., Ltd. did.

(3) Stretch property of processed yarn

The stretchability of the processed yarn was evaluated by the stretch ratio obtained according to the JIS-L-109 stretch test method (Method C).

As pretreatment of the sample, the sample was subjected to wet heat at 90 ° C for 15 minutes, and left overnight. The larger the value, the higher the stretchability of the processed yarn.

(4) Elongation recovery of processed yarn

The elongation recovery of the processed yarn was evaluated by measuring the elongation recovery at 10% elongation.

The fiber was attached to the tensile tester at a chuck distance of 10 cm, stretched to an elongation of 10% at a speed of 20 c / min, and when the elongation reached 10%, the reverse was applied. Shrink at the same speed to draw a stress-strain curve. During shrinkage, the residual elongation when the stress was reduced to 0.009 cN / dtex, which is equal to the initial load, was calculated by the following equation.

Elongation recovery rate at 10% elongation (%) = [(10-L) / 10] X I 00

The larger this value, the higher the elongation and recovery of the processed yarn.

(5) Stretch rate and elongation recovery rate of fabric

4.9 N / cm stress when the sample is stretched in the longitudinal or weft direction at a grip width of 2 cm, a grip distance of 10 cm, and a tensile speed of 10 cmZ using the tensile tester described above. The stretch (%) below was taken as the stretch rate. Further, when the stress reaches 4.9 NZ cm, it is contracted again at the same speed, and a stress-strain curve is drawn.The residual elongation when the stress decreases to O NZ cm is defined as L 1. Calculated by the following equation. Elongation recovery rate of fabric (%) = [(10-L1) / 10] XI 00

[Production example of polytrimethylene terephthalate fiber yarn]

Polytrimethyl terephthalate of 77 sp / c = 0.8 is spun at a spinning temperature of 26.5 ° C and a spinning speed of 1200 m to obtain an undrawn yarn, and then hot. Rolled at a temperature of 60 ° C, hot plate temperature of 140 ° C, stretch ratio of 3 times, and stretched at a stretching speed of 80 Om to obtain a drawn yarn of 56 dtex / 24 f. . The strong elongation, the elastic modulus, and the elongation recovery rate at the time of 10% elongation of this drawn yarn were 3.1 NZ dtex, 46%, 26.4 c NZ dtex and 98%, respectively.

In addition, a drawn yarn of 84 dtex Z 24 f was obtained in the same manner as above except that the discharge amount was changed. The strong elongation, the elastic modulus, and the elongation recovery rate at 10% elongation of the drawn yarn were 3.0 Oc NZ dtex, 44%, 25.3 c NZ dtex, and 98%, respectively. .

(Example 1)

Polytrimethylene terephthalate fiber obtained in the above production example 5

6 dtex x 24 f drawn yarn was turned using a 3H A pre-twisting false twisting machine manufactured by Murata Machinery, with a spindle rotation speed of 1200 rpm and a pre-twisting speed (S direction) of 8

0 0 TZm, number of false twists (Z direction) 500 0 TZm, overfeed rate 5%, false twisting at 170 ° C , K 2 = 3 1 4 3 0).

The strength, elongation, elastic modulus, stretch and elongation of the obtained pre-fired false twisted yarn, 1 The elongation recovery rates at 0% elongation are 2.8c NZ dtex, 46%, 15cN / dte X. 110%, 96%, respectively, and the strength, elongation, and elasticity are In addition, both stretchability and stretch recovery were excellent.

(Example 2)

The drawn yarn of the poly (methylene terephthalate) fiber 56 d / 24 f obtained in the above production example was subjected to a spindle rotation speed of 1 using a 3 HA pretwisting false twisting machine manufactured by Murata Machinery. 200 rpm, number of twists (Z direction) 100 TZm, number of false twists (S direction) 500 TZm, overfeed rate 5%, temperature of false twist heater 170 ° C First-twisted false twisting was performed (Kl = 7 483, Κ2 = 2993 3).

The strength, elongation, elastic modulus, stretching elongation, and elongation recovery at 10% elongation of the obtained pretwisted false twisted yarn were 2.9 cN / dtex, 48%, and 14. lc NZ dtex, 130%, 97%, excellent in strength, elongation, elastic modulus, stretchability, and elongation recovery.

(Example 3)

The polyethylene methylene terephthalate fiber 84 dtex / 24 f obtained in the above-mentioned production example was subjected to a spindle rotation speed of 1200 d using a 3 HA twisting false twisting machine manufactured by Murata Machinery. 0 rpm, number of twists (S direction) 900 mm / m, number of false twists (Z direction) 4100 TZm, overfeed rate 5%, temperature of false twist heater 170 ° C Pre-twisting false twisting was performed (K 1 = 8 249, K 2 = 293 288).

The strength, elongation, elastic modulus, elastic elongation, and elongation recovery at 10% elongation of the obtained pretwisted false twisted yarn were 3.0 lc NZ dtex, 45%, and 14.0 c, respectively. The N / dtex was 120% and 97%, which were excellent in strength, elongation, elastic modulus, stretchability, and elongation recovery.

(Example 4)

Polymethylene methylene terephthalate fiber obtained in the above production example 8 4 dtex Z 24 f was twisted at 90 OT / m in the S direction using Murata Machinery's DT-310, and 80 was set on a vacuum setter. C, set for 40 minutes. Using a Mitsubishi LS-2 calcining machine made by Mitsubishi Heavy Industries, this yarn was used at a spindle speed of 3800 rpm, a false twist number (Z direction) of 4200 TZm, and an underfeed rate of 5.5 %, And a false twisting process was performed at a false twist temperature of 170 ° C (K1 = 8249, K2 = 304245). The strength, elongation, elastic modulus, elongation and elongation, and elongation recovery of the obtained false twisted yarn at 10% elongation were 3.O c NZ dtex, 50%, and 13.9 c NZ, respectively. The dtex was 115% and 96%, which were excellent in strength, elastic modulus, stretchability, and elongation recovery.

[Comparative Example 1]

The drawn yarn of the polymethylene terephthalate fiber 56 dtex X 24 f obtained in the above production example was spinned at a spindle speed of 2 75 using a Mitsubishi Heavy Industries LS-2 false twisting machine. The false twisting was performed under the conditions of 0,000 rpm, the number of false twists (Z direction), 420 T / m, the overfeed rate of 5%, and the false twist temperature of 170 ° C.

The strength, elongation, elastic modulus, elastic elongation, and elongation recovery of the obtained false twisted yarn at 10% elongation were 3.0 cN / dte X 57% and 15.99 c, respectively. The NZ dtex was 120% and 80%, respectively, and although the strength, elastic modulus, and elongation / shrinkage were obtained as stretch materials, the elongation recovery was poor.

(Comparative Example 2)

The false-twisted yarn obtained in Comparative Example 1 was subjected to reverse combustion of 80 O TZm in the S direction using DT-3130 manufactured by Murata Machinery Co., Ltd. A 0 minute set was performed.

The strength, elongation, elastic modulus, elastic elongation, and elongation recovery at 10% elongation of the obtained yarn are 2.3 c NZ dtex, 38%, 15.9 c NZ d The tex was 80% and 97%, and the stretchability and elongation recovery were good, but the strength level was insufficient.

(Comparative Example 3)

Same as Example 1 except that the polymethylene terephthalate fiber 56 で / I4f obtained in the above production example was drawn at a false twist number (S direction) of 3400 O TZm. Under the following conditions, false-twist false twisting (same direction) was performed (Kl = 59987, Κ2 = 314430).

The strength, elongation, elastic modulus, stretch elongation, and elongation recovery at 10% elongation of the obtained pretwisted false twisted yarn were 2.9 cN / dtex, 43%, and 15 .5, respectively. 9 c NZ dtex, 25% and 96%, indicating that the yarn had excellent stretch recovery properties, but lacked stretchability.

(Comparative Example 4)

In Example 1, 56 dtex / 24 f polyethylene terephthalate fiber (strength, elongation, elastic modulus and 1 d) was used in place of the polymethylene terephthalate fiber. The elastic recovery rates at 0% elongation are 4.85 c NZ dtex, 32%, 66 c NZ dtex, and 49%, respectively.) Except that the temperature was changed to ° C, pre-twisting false twisting was performed under the same conditions as in Example 1 (K1 = 59987, K2 = 31430).

The strength, elongation, elastic modulus, elastic elongation, and elongation recovery at 10% elongation of the obtained twisted false twisted yarn are 3.9 c NZ dtex, 33%, 30.0 cN / dtex, 50% and 66%, the stretchability and elongation / recovery were low, and were not suitable as stretch materials. Examples and Comparative Examples of Composite Yarn False Twisted Yarn of the Present Invention>

(Example 5)

Polytrimethylene terephthalate fiber obtained in the above production example 8 4 dtex / 24 f and copper ammonia rayon yarn 84 dtex / 45 f (Asahi Kasei Kogyo) were converted to 0.07 c using a burn winder (Murata Kikai Co., Ltd., type 303— —). The yarns were aligned with the tension of NZ dtex, and entangled with an interlace at a speed of 400 m while applying confounding at a pressure of 15 OkPa. Next, using a Murata Machinery 3 HA twisting false twisting machine, the spindle rotation speed was 1200 rpm, the twisting number (S direction) was 500 TZm, and the false twist number (Z direction) was 2800. Pre-twisted false twisting was performed at TZm, overfeed rate of 5%, and false twisting heater temperature of 170 ° C (K1 = 6481, K2 = 299811) ).

The obtained composite twisted false twisted yarn has a copper ammonia rayon yarn content of 50 wt%, strength, elongation, elastic modulus, elastic elongation, and elongation recovery at 10% elongation. They were 2.5 c NZ dtex, 26%, and 25 cN dtex, 80% and 85%, respectively, and were excellent in strength, stretchability, and elongation recovery.

(Example 6)

56 dtex / 24 f of the polymethylene terephthalate fiber obtained in the above production example and 84 dtex Z 30 f of a polyethylene terephthalate fiber W-shaped cross section yarn (manufactured by Asahi Kasei Corporation) Strength, elongation, elastic modulus, and elongation recovery at 10% elongation are 4.5 cN / dtex, 35%, 60 cN / dtex, and 45%, respectively.) Except for the above, pre-twisting false twisting was carried out in the same manner as in Example 5 (K 1 = 59,16, K 2 = 27,214).

The obtained composite twisted false twisted yarn has a content of polyethylene terephthalate fiber of 40 wt%, strength, elongation, elastic modulus, elongation / shrinkage elongation, and recovery at elongation of 10%. Were 3.4 c NZ dtex, 40%, 21 c NZ dtex, 90% and 88%, respectively, and both the stretchability and elongation and recovery of the yarn were good. (Comparative Example 5)

A composite was prepared in the same manner as in Example 5 except that polymethylene terephthalate fiber 22 dtex / 12 f and copper ammonia rayon yarn 110 Odtex / 60 f were used. A twisted false twisted yarn was obtained (K1 = 57445, K2 = 264424).

The obtained composite twisted false twisted yarn has a copper ammonia rayon yarn content of 83.3 wt%, strength, elongation, elastic modulus, stretch elongation, and elongation recovery at 10% elongation. Are 2.Oc NZ dtex, 20%, 31 and 2c NZ dtex, 50%, 70%, respectively, which are inferior in strength, stretchability and elongation recovery. Was.

(Example 7)

Using the polytrimethylene terephthalate fiber 84 dtex / 24 f obtained in the above production example, using the pre-burnt false twisting machine used in Example 1, the spindle speed was 1 2 0 0 0 rpm, number of twists (S direction) 500 T nom, number of false twists (Z direction) 3700 T / m, overfeed rate 5%, temperature of false twist heater 1 Pre-twisting false twisting was performed at 70 ° C. (K 1 = 4583, K2 = 29332).

Next, using a composite winder (manufactured by Chuetsu Machinery Co., Ltd., type MT-CW), the obtained pretwisted false twisted yarn was over-fed by 5%, and the copper ammonia rayon yarn 56 dtex was added thereto. / 30f (made by Asahi Kasei Kogyo Co., Ltd.) and twisted at a speed of 300 mZ while applying confounding with an interlacer at a pressure of 15 OkPa.

The resulting composite yarn has a copper ammonia rayon yarn content of 38

.8%, strength, elongation, elastic modulus, elongation at stretch, and elongation recovery at 10% elongation are 2.6 c NZ d tex, 20%, 26.2 c N / d, respectively.

2 o The tex was 80% and 85%, and both strength, stretchability, and elongation recovery were good. Examples of the woven and knitted fabrics of the present invention>

(Example 8)

The pretwisted false twisted yarn of 84 dtex / 24 f polytrimethyl terephthalate fiber obtained in Example 3 was used as a warp and a weft, and had a width of 150 cm. Using an air jet room (type ZA-209i, manufactured by Tsudakoma Kogyo Co., Ltd.), a green fabric having a density of 87 pieces Z2.54 cm and a density of 90 pieces / 2.54 cm was obtained. . This greige was scoured and relaxed at 95 ° C with a liquid jet dyeing machine, then intermediate set at 170 ° C using a tenter, and then set at 120 ° C with a liquid jet dyeing machine. Dyed with a disperse dye, and final set at 170 ° C to obtain a cloth with a density of 117 pieces 2.54 cm and a density of 120 pieces / 2.54 cm. Was.

The obtained fabric had a stretch ratio in the warp direction of 24% and 88%, respectively, and a stretch ratio in the weft direction of 27% and 88%, respectively. % And 87%, and the fabric has excellent stretchability and elongation recovery in both cases.

(Example 9)

The composite pretwisted false twisted yarn composed of 84 dtex / 24 f of the polytrimethylene terephthalate fiber obtained in Example 5 and 84 dtex / 45 f of copper ammonia rayon was used as the warp yarn. In the air jet room, with a warp of 78 // 2.54 cm and a weft of 65 / ^ 2.

A green body of 2 Z 2 twill tissue of 54 cm density was obtained. This greige was dyed in the same manner as in Example 8, except that the dye used in Example 8 was changed to a disperse dye and a direct dye combined type.

8 5 pieces of 2.54 cm density cloth were obtained. The resulting fabric has a cool feel unique to copper ammonia, a stretch ratio of 22% in the warp direction, a stretch recovery ratio of 83%, and a stretch in the weft direction. As a result, the stretch ratio was 20% and the elongation recovery rate was 85%, indicating that it had excellent stretchability and elongation recovery.

(Example 10)

A composite twisted false twist consisting of the polymethylene terephthalate fiber 56 dtex / 24 f obtained in Example 6 and the polyethylene terephthalate fiber W-shaped cross-section yarn 84 dte X 30 f The processed yarn was used as a warp and a weft, and a green fabric having a density of 2Z2 twill with a density of 8 warps Z2.54 cm and a density of 72 wps 2.54 cm was obtained in the air jet room. Was. The greige fabric was subjected to the same dyeing processing as in Example 9 to obtain a cloth having a density of 115 pieces and a thickness of 2.54 cm and a density of 97 pieces and a density of 2.54 cm.

The resulting fabric is soft in texture, excellent in water absorbency and quick drying, with a stretch ratio of 23% in the longitudinal direction, a stretch recovery ratio of 85%, and a stretch ratio in the weft direction of 2%. The elongation / recovery rate was 2% and the elongation / recovery rate was 8%.

(Example 11)

The composite yarn composed of the polytrimethylene terephthalate fiber 84 dtex / 24 f of the pretwisted false twisted yarn and the copper ammonia rayon yarn 56 dtex / 30 f obtained in Example 7 was used. The woven fabric having a density of 86 / 2.54 cm and a density of 72 / 2.54 cm 2Z2 twill is used as the warp and weft in the air jetting machine. Obtained. The greige fabric was subjected to the same dyeing processing as in Example 9 to obtain a cloth having a density of warp 112 pieces Z2.54 cm and a degree of weft 94 pieces Z2.54 cm.

The texture of the obtained fabric has a refreshing feeling unique to copper ammonia, a stretch ratio of 20% in the warp direction, a recovery ratio of 83% in elongation, and a stretch ratio of 1 in the weft direction. Excellent stretch with 9% growth recovery rate of 84% It had properties and elongation recovery.

(Example 12)

The pretwisted false twisted yarn of 84 dtex / 24 f polymethylene terephthalate fiber obtained in Example 3 was subjected to 45 courses using a 32 gage circular knitting machine, A smooth knitted fabric was produced at a density of 44 mm. After scouring the smooth knitted fabric, it was dyed at 120 ° C. for 30 minutes using a Circular dyeing machine, and then dried. After drying, a final set was performed at 170 ° C. for 1 minute with a width to obtain a 49-course, 54-well cloth.

This fabric had a stretch ratio in the weft direction and an elongation recovery ratio of 200% and 98%, respectively, indicating good performance in both stretchability and elongation recovery. . Industrial applicability

The twisted false twisted yarn, the composite twisted false twisted yarn, and the composite yarn of the present invention have a soft texture, and have excellent stretchability and elongation recovery properties. It is suitable.

By using the processed yarn of the present invention, a fabric excellent in stretchability and stretch recovery can be obtained.

Claims

The scope of the claims

1. Pre-twisted false twisted yarn composed of multi-filament multi-filament fibers and the twist direction of the false twist is different from the twist direction of the false twist. A twisted false twisted yarn characterized by being in the direction.

2. A composite twisted false twisted yarn composed of multifilament multifilament fibers and other fibers, the twist direction of the twist and the twist direction of the false twist Are in different directions, and the content of other fibers in the composite twisted false twisted yarn is less than 80 wt%.

3. A composite yarn comprising the twisted false twisted yarn according to claim 1 and another fiber, wherein the content of the other fiber in the composite yarn is less than 50 wt%. And composite processing yarn.

4. At least one selected from the twisted false twisted yarn according to claim 1, the composite twisted false twisted yarn according to claim 2, and the composite twisted yarn according to claim 3, Or a cloth ri characterized by being used for wefts

5. The twisted false twisted yarn according to claim 1, wherein the coefficient K1 of the number of twists calculated by the following formula (I) is not less than 2700 and not more than 1400.

K 1 = T 1 X [fineness of thread (dtex)] ^1/2 … (I)

6. The coefficient K1 of the number of twists calculated by the following equation (I) is 2700 or more and 1400 or less, and the coefficient K2 of the number of false twists calculated by the following equation (II) is 2 The false twisted twisted yarn according to claim 1, wherein the yarn is not less than 0000 and not more than 350 000.

K 1 = T 1 [Yarn fineness (dtex)] ^1/2 … (I) (However, in the above formula (I), T 1 indicates the number of twists per unit length (T / m).)

K 2 = (T 2-T 1) X [Fiber fineness (dtex)] ^1/2 … (II) (In the above formula (II), T 1 is the number of twists per unit length (T / m) and T 2 indicate the number of false twists per unit length (T / m).)

7. Manufacture of a pre-twisted false twisted yarn including a process of pre-twisting a multifilament multi-filament multi-filament yarn and calcining in a direction different from the twist direction of the pre-twist. Method.

8. The coefficient K1 of the number of twists calculated by the following formula (I) is 2700 or more,

The method for producing a false twisted twisted yarn according to claim 7, which is not more than 1400.

K 1 = T 1 X [fineness of thread (dtex)] ^1/2 … (I)

9. The coefficient K1 of the number of twists calculated by the following equation (I) is 2700 or more, 140 or less 0, and the coefficient K2 of the number of false twists calculated by the following equation (II) is 2 The method for producing a false-twisted false twisted yarn according to claim 7, wherein the yarn is no less than 0000 and no more than 350,000.

K 1 = T 1 X [fineness of thread (dtex)] ^1/2 … (I)

K 2 = (T 2-T 1) X [Fiber fineness (dtex)] ^1/2 … (II) (In the above formula (II), T 1 is the number of twists per unit length (T / m). T 2 indicates the number of false twists per unit length (T / m).