JP2005264348A - Fluid-jet-processed yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid-jet-processed yarn from which knit or woven fabrics having beautiful surface appearance are produced. <P>SOLUTION: The fluid-jet-processed yarn comprises a core yarn and a sheath yarn and is heat set. The core yarn comprises ≥2 species of polyester components. One of the components is a latent crimp-expressing polyester-based fiber multifilament yarn composed a polytrimethylene terephthalate. The sheath yarn is a non-thermoplastic fiber multifilament yarn. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluid jetting yarn composed of a core yarn and a sheath yarn and heat-set.

  Patent Document 1 discloses a fluid-jet-processed yarn having a sheath-core structure using a polyester fiber multifilament yarn having latent crimps, one component of which is made of polytrimethylene terephthalate, and has a spun-like shape and swelling. There has been proposed a fluid jet yarn that has a feeling and has a large stretch property, a stretch back feeling and softness, and has a residual torque and does not generate skew.

However, in particular, the fluid injection processed yarn having a sheath core structure using a non-thermoplastic fiber multifilament yarn such as cellulosic fiber as a sheath yarn has a drawback that it is difficult to obtain a knitted fabric having a beautiful face when it is knitted. was there.
JP 2003-213533 A

  The present invention provides a fluid jet yarn that provides a knitted fabric with a beautiful eye surface.

The inventor of the present invention has arrived at the present invention as a result of intensive studies to solve the above problems.
That is, the present invention is as follows.

  1. A fluid-jet processed yarn composed of a core yarn and a sheath yarn and heat-set, wherein the core yarn is composed of two or more polyester components, one component of which is a polytrimethylene terephthalate latently crimpable polyester A fluid-jet processed yarn, which is a multi-filament yarn and a sheath yarn is a non-thermoplastic fiber multifilament yarn.

2. 2. The fluid jetting yarn according to 1 above, wherein the latently crimped polyester fiber multifilament yarn satisfies the following (a) and (b):
(A) Initial tensile resistance is 10 to 30 cN / dtex
(B) Thermal shrinkage stress at 100 ° C. is 0.1 to 0.5 cN / dtex

3. 3. The fluid jet yarn according to 1 or 2 above, wherein the non-thermoplastic fiber multifilament yarn is a cellulosic fiber multifilament yarn.
4). The knitted fabric comprised with the fluid jetting yarn in any one of said 1-3.
5). The textile fabric comprised with the fluid jetting yarn in any one of said 1-3.

Hereinafter, the present invention will be described in detail.
In the present invention, the latent crimp-expressing polyester fiber used for the core yarn is composed of at least two types of polyester components (specifically, many are joined to the side-by-side type or the eccentric core-sheath type), At least one component thereof is polytrimethylene terephthalate, which develops crimps by heat treatment. The composite ratio of the two types of polyester components (generally many are in the range of 70/30 to 30/70 in terms of wt%) and the joining surface shape (there is a straight or curved shape) are not limited.

  Specific examples of such latent crimp-expressing polyester fibers include polytrimethylene terephthalate as one component as disclosed in JP-A-2001-40537.

  The latent crimp-expressing polyester fiber is a composite fiber in which at least two types of polyester polymers are joined in a side-by-side type or an eccentric core-sheath type, and in the case of a side-by-side type composed of two types of polyester polymers, The melt viscosity ratio of the polyester polymer is preferably 1.00 to 2.00, and in the case of the eccentric core-sheath type, the sheath polymer and the core polymer have an alkali weight loss rate ratio that is 3 times or more that the sheath polymer is fast. preferable.

  Specific polymer combinations include polytrimethylene terephthalate (polyester having terephthalic acid as the main dicarboxylic acid and 1,3-propanediol as the main glycol component, glycols such as ethylene glycol and butanediol, and isophthalic acid. Further, dicarboxylic acids such as 2,6-naphthalenedicarboxylic acid, etc. may be copolymerized, and other polymers and additives such as matting agents, flame retardants, antistatic agents and pigments may also be contained. ) And polyethylene terephthalate (polyester containing terephthalic acid as the main dicarboxylic acid and ethylene glycol as the main glycol component, and copolymerizing glycols such as butanediol, isophthalic acid, and dicarboxylic acids such as 2,6-naphthalenedicarboxylic acid) Other polymers, matting agents Combinations of flame retardants, antistatic agents, pigments, etc.), as well as polytrimethylene terephthalate and polybutylene terephthalate (terephthalic acid is the main dicarboxylic acid, and 1,4-butanediol is the main. Polyester used as a glycol component, which may be copolymerized with glycols such as ethylene glycol, diphthalic acid such as isophthalic acid, 2,6-naphthalenedicarboxylic acid, etc. Further polymers, matting agents, flame retardants In addition, an additive such as an antistatic agent and a pigment may be contained, and a combination of polytrimethylene terephthalate disposed inside the crimp is particularly preferable.

  In addition to the above Japanese Patent Laid-Open No. 2001-40537, Japanese Patent Publication No. 43-19108, Japanese Patent Laid-Open No. 11-189923, Japanese Patent Laid-Open No. 2000-239927, Japanese Patent Laid-Open No. 2000-256918, Japanese Patent Laid-Open No. 2000-328382. In Japanese Patent Application Laid-Open No. 2001-81640, etc., the first component is polytrimethylene terephthalate, and the second component is a polyester such as polytrimethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate in parallel or eccentric. A composite fiber that is composite-spun into a side-by-side type or an eccentric sheath-core type arranged in the above is disclosed. 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 order to achieve the object of the present invention, a suitable latently crimpable polyester fiber preferably has an initial tensile resistance of preferably 10 to 30 cN / dtex, more preferably 20 to 30 cN / dtex, and most preferably 20 to 27 cN / dtex. When the initial tensile resistance is in the above range, a soft texture can be obtained and the production is easy. Further, the heat shrinkage stress at 100 ° C. is preferably 0.1 to 0.5 cN / dtex, more preferably 0.1 to 0.4 cN / dtex, most preferably 0.1 to 0.3 cN / dtex. is there. When the heat shrinkage stress at 100 ° C. is in the above range, the production is easy and the object of the present invention is sufficiently achieved.

  As a more preferable characteristic, the stretch elongation rate of the actual crimp is preferably 10 to 100%, more preferably 10 to 80%, and most preferably 10 to 60%. When the expansion / contraction elongation ratio of the actual crimp is in the above range, the production is easy and the object of the present invention is sufficiently achieved. The stretch elastic modulus of the actual crimp is preferably 80 to 100%, more preferably 85 to 100%, and most preferably 85 to 97%. When the stretch elastic modulus of the actual crimp is in the above range, the production is easy and the object of the present invention is sufficiently achieved.

  The expansion / contraction elongation after the hot water treatment is preferably 100 to 250%, more preferably 150 to 250%, and most preferably 180 to 250%. Manufacture is easy and the objective of this invention is fully achieved as the expansion-contraction elongation rate after a hot-water process is said range. The stretch elastic modulus after the hot water treatment is preferably 90 to 100%, more preferably 95 to 100%. The objective of this invention is fully achieved as the expansion-contraction elastic modulus after a hot-water process is said range.

  Examples of the latent crimp-expressing polyester fiber having such characteristics include composite fibers composed of single yarns in which two types of polytrimethylene terephthalates having different intrinsic viscosities are combined in a side-by-side manner.

  The difference in intrinsic viscosity between the two types of polytrimethylene terephthalate is preferably 0.05 to 0.50 (dl / g), more preferably 0.10 to 0.45 (dl / g), and most preferably 0. .15 to 0.45 (dl / g). For example, when the intrinsic viscosity on the high viscosity side is selected from 0.70 to 1.30 (dl / g), the intrinsic viscosity on the low viscosity side is selected from 0.50 to 1.10 (dl / g). Is preferred.

The intrinsic viscosity on the low viscosity side is preferably 0.80 (dl / g) or more, more preferably 0.85 to 1.00 (dl / g), and most preferably 0.90 to 1.00 (dl / g). It is.
The intrinsic viscosity of the composite fiber itself, that is, the average intrinsic viscosity is preferably 0.70 to 1.20 (dl / g), more preferably 0.80 to 1.20 (dl / g), and 0.85 to 1. 15 (dl / g) is more preferable, and 0.90 to 1.10 (dl / g) is most preferable.

  The value of intrinsic viscosity in the present invention refers to the viscosity of the spun yarn, not the polymer used. This is because polytrimethylene terephthalate is more susceptible to thermal degradation than polyethylene terephthalate and the like, and even if a polymer with a high intrinsic viscosity is used, the intrinsic viscosity decreases due to thermal degradation, and the composite fiber obtained by spinning. This is because it is difficult to maintain the difference in intrinsic viscosity between the two.

  The polytrimethylene terephthalate is a polyester having a trimethylene terephthalate unit as a main repeating unit, and the trimethylene terephthalate unit is 50 mol% or more, preferably 70 mol% or more, more preferably 80 mol% or more, most preferably 90 mol. The thing which contains more than%. Accordingly, as the third component, the total amount of other acid components and / or glycol components is 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, and most preferably 10 mol% or less. Includes included polytrimethylene terephthalate.

  Polytrimethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof with 1,3-propanediol or a functional derivative thereof in the presence of a catalyst under suitable reaction conditions. In this synthesis process, a suitable one or two or more third components may be added to form a copolyester. Polytrimethylene terephthalate such as polyethylene terephthalate or polybutylene terephthalate may be blended with polyester or nylon other than polytrimethylene terephthalate. The content of polytrimethylene terephthalate during blending is preferably 50% or more by weight.

  The third component to be added includes 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, 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.) and the like. In addition, a compound having one or three or more ester-forming functional groups (such as benzoic acid or glycerin) can be used within a 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, Flame retardants, antistatic agents, pigments, fluorescent brighteners, infrared absorbers, antifoaming agents and the like may be contained.

  Examples of a method for producing a latently crimpable polyester fiber are disclosed in each of the above patent publications. For example, after obtaining an undrawn yarn at a winding speed of 3000 m / min or less, 2-3. A method of twisting at about 5 times is preferable, and a straight-rolling method (spin draw method) in which the spinning and drawing processes are directly connected, and a high-speed spinning method (spin take-up method) with a winding speed of 5000 m / min or more are adopted. Also good.

In the present invention, the total fineness of the latent crimp-expressing polyester fiber is preferably 20 to 300 dtex, and the single yarn fineness is preferably 0.5 to 20 dtex, but is not particularly limited thereto.
The shape of the fiber may be uniform or thick in the length direction. The cross-sectional shape of the fiber is round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, Yaba-shaped, flat (flatness of about 1.3-4, W-shaped, I-shaped, Boomerang A polygonal type such as a dogbone type, a multi-leaf type, a hollow type, and an indeterminate type.

Next, examples of the non-thermoplastic fiber multifilament yarn used for the sheath yarn include silk, cellulosic fiber multifilament yarn, such as cupra, viscose rayon, purified cellulose fiber, and acetate fiber (diacetate, triacetate). Of these, cellulosic fiber multifilament yarn is preferred. The total fineness is preferably 20 to 300 dtex, and the single yarn fineness is preferably 0.5 to 20 dtex, but is not particularly limited thereto.
The ratio of the core yarn to the sheath yarn (core yarn / sheath yarn) is wt%, preferably 30 to 70/70 to 30, more preferably 30 to 60/70 to 40, and particularly preferably 35 to 50/65. 50.

  In the present invention, an example of a method for producing a fluid-jet processed yarn is a two-feed method with a so-called feed difference. Then, it can be manufactured by a method in which filaments are entangled while forming a loop-like fluff by jetting a fluid such as air at a high speed to jet the multifilament yarn out of the nozzle and at the same time rapidly decelerate. The feed rate of the core yarn is preferably + 5% to + 20%, more preferably +5 to + 15%, and the sheath yarn is preferably +8 to + 40%, more preferably +8 to + 30%. The feed rate difference is preferably +3 to + 30%, more preferably +3 to + 20%.

  Although the processing speed at the time of fluid injection processing may be set arbitrarily, the range of 50 to 500 m / min is preferable, and the range of 100 to 400 m / min is more preferable. The fluid injection pressure may be arbitrarily determined depending on the desired yarn structure, but the gauge pressure is preferably 250 kPa to 1 MPa, and particularly preferably 400 kPa to 1 MPa. Furthermore, the entanglement between the multifilaments can be made stronger and more uniform by applying an appropriate amount of water to the supply yarn at the time of fluid ejection processing.

  In the present invention, it is necessary to perform heat setting after fluid injection processing, and a beautiful knitted fabric or woven fabric can be obtained by heat setting. The heat setting temperature is preferably 130 to 210 ° C., more preferably 150 to 190 ° C. as the tube heater temperature, and the heat setting time is preferably 0.1 to 0.5 seconds, more preferably 0.1 to 0. 3 seconds.

The fluid-jet processed yarn of the present invention may be used by revealing latent crimps by means such as thermal relaxation. There are methods to be used, and it is particularly suitable for flat knitted fabrics.
In addition, within the range which does not impair the objective of this invention, you may mix other fibers, such as a natural fiber and a synthetic fiber, in the range of 50 wt% or less normally in the fluid injection processing thread | yarn of this invention.

  Examples of other fibers to be mixed include natural fibers such as cotton, wool, hemp and silk, and polyester fibers such as cupra, viscose, polynosic, purified cellulose, acetate, polyethylene terephthalate, polybutylene terephthalate and polytrimethylene terephthalate. And various artificial fibers such as nylon and acrylic, copolymerized types thereof, and composite fibers using the same or different polymers (side-by-side type, eccentric sheath-core type, etc.).

  As a method of mixing, means such as blending (core yarn, silofill, hollow spindle, etc.), covering (single, double), etc., low shrinkage yarn having a boiling water shrinkage of about 3 to 10%, or boiling water shrinkage, for example Examples thereof include blending, cross-twisting and false twisting (high elongation difference false twisting, composite in POY stretching false twisting, etc.), two-feed fluid jet processing, and the like.

  By using the fluid jet yarn of the present invention, a knitted fabric or woven fabric having a particularly beautiful eye surface can be obtained.

Hereinafter, the present invention will be further described with reference to examples.
The measurement method and evaluation method used in the present invention are as follows.

(1) Intrinsic viscosity Intrinsic viscosity [η] (dl / g) is a value determined based on the definition of the following equation.

  In the formula, ηr is the viscosity of a diluted solution of polytrimethylene terephthalate yarn or polyethylene terephthalate yarn dissolved in an o-chlorophenol solvent having a purity of 98% or more, divided by the viscosity of the solvent measured at the same temperature. Which is defined as relative viscosity. C is the polymer concentration expressed in g / 100 ml.

  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 defined as the intrinsic viscosity of the polymer constituting the composite multifilament.

(2) Initial tensile resistance According to the initial tensile resistance test method of JIS L 1013 (chemical fiber filament yarn test method), an initial load of 0.0882 cN / dtex is applied per unit fineness of the sample, and a tensile test is performed. The initial tensile resistance (cN / dtex) is calculated from the obtained load-elongation curve. Ten samples are collected and measured, and the average value is obtained.

(3) Stretch elongation rate and stretch elastic modulus Measured according to the stretchability test method A of JIS L 1090 (synthetic fiber filament bulky processed yarn test method), stretch elongation rate (%) and stretch modulus (% ) Is calculated. Ten samples are collected and measured, and the average value is obtained.
The expansion / contraction elongation ratio and the expansion / contraction elastic modulus of the actual crimp are measured after leaving the sample unwound from the winding package in an environment of a temperature of 20 ± 2 ° C. and a relative humidity of 65 ± 2% for 24 hours.
The stretch elongation rate and the stretch elastic modulus after the hot water treatment are obtained by immersing in 98 ° C. hot water for 30 minutes with no load and then naturally drying for 24 hours without load.

(4) Thermal shrinkage stress Using a thermal stress measuring device (trade name KE-2, manufactured by Kanebo Engineering Co., Ltd.), the sample is cut into a length of 20 cm, ends are tied, a ring is formed, and the initial load is 0. The shrinkage stress is measured under the condition of 0.04 cN / dtex and the heating rate is 100 ° C./min, and the heat shrinkage stress at 100 ° C. is read from the change curve of the heat shrinkage stress with respect to the obtained temperature.

[Reference Example] (Manufacture of latent crimped polyester fiber)
Side-by-side composite multifilaments having different intrinsic viscosities were produced according to Production Examples 1 to 3 below.

(Production Example 1)
Two types of polytrimethylene terephthalate with different intrinsic viscosities are extruded into a side-by-side mold at a mass ratio of 1: 1 using a side-by-side compound spinning spinner, and undrawn yarn is spun at a spinning temperature of 265 ° C. and a spinning speed of 1500 m / min. Obtained. Next, the hot roll temperature is 55 ° C., the hot plate temperature is 140 ° C., the stretching speed is 400 m / min, the stretching ratio is set so that the fineness after stretching becomes 56 dtex, and the side-by-side type composite multifilament of 56 dtex / 24f is formed. Obtained.

  The resulting composite multifilament had an intrinsic viscosity of 0.90 on the high viscosity side and 0.70 on the low viscosity side. Table 1 shows the initial tensile resistance, the stretch elongation / stretch elastic modulus of the actual crimp, the stretch elongation / stretch elastic modulus after the hot water treatment, and the heat shrinkage stress at 100 ° C.

(Production Example 2)
A 56 dtex / 24 f side-by-side composite multifilament was obtained in the same manner as in Production Example 1. The resulting composite multifilament had an intrinsic viscosity of 0.88 on the high viscosity side and 0.70 on the low viscosity side. Table 1 shows the initial tensile resistance, the stretch elongation / stretch elastic modulus of the actual crimp, the stretch elongation / stretch elastic modulus after the hot water treatment, and the heat shrinkage stress at 100 ° C.

(Production Example 3)
A side-by-side composite multifilament of 56 dtex / 24f was obtained in the same manner as in Production Example 1 except that polytrimethylene terephthalate and polyethylene terephthalate having different intrinsic viscosities were used in Production Example 1. The resulting composite multifilament had an intrinsic viscosity of 0.98 on the polytrimethylene terephthalate side and 0.60 on the polyethylene terephthalate side. Table 1 shows the initial tensile resistance, the stretch elongation / stretch elastic modulus of the actual crimp, the stretch elongation / stretch elastic modulus after the hot water treatment, and the heat shrinkage stress at 100 ° C.

[Examples 1 to 3]
Three types of fluid injection-processed yarns using the latently crimped composite multifilament yarns obtained in Production Examples 1 to 3 and 84 dtex / 54f cupra multifilament yarns (manufactured by Asahi Kasei Corporation, Bemberg (registered trademark)). Manufactured. Specific manufacturing conditions are as follows.

Nozzle: Hema jet TE-312K
Processing speed: 350 m / min Air pressure: 588 kPa (6.0 kg / cm ² )
Feed rate: Latent crimped composite multifilament yarn ... + 8%
Cupra multifilament yarn ... + 12%
Water application: Yes Heat setting temperature: 170 ° C
Heat setting time: 0.24 seconds (heater length: 1.4 m)

All of the obtained fluid-jet processed yarns were sheath-core structure yarns in which the latent crimp-forming composite multifilament yarn was relatively located at the core and the cupra multifilament yarn was relatively located at the sheath.
A sock knitted fabric was produced using the obtained fluid jetting yarn and subjected to a hot water treatment for 30 minutes.
The surface of the obtained sock knitted fabric was beautiful and had a flat feeling with little unevenness.

[Comparative Example 1]
In Example 1, a fluid jetting yarn was produced in the same manner as in Example 1 except that heat setting was not performed. A sock knitted fabric was produced using this, and a hot water treatment was performed for 30 minutes.
The surface of the obtained sock knitted fabric had an uneven feeling as compared with Example 1, and had a non-uniform uneven feeling.

[Example 4]
In Example 1, fluid jet machining is performed in the same manner as in Example 1 except that 133 dtex / 48f viscose rayon multifilament yarn is used instead of cupra multifilament yarn, the processing speed is 250 m / min, and the feed rate is + 18%. A yarn was made. A sock knitted fabric was produced using the obtained fluid jetting yarn and subjected to a hot water treatment for 30 minutes.
As with Example 1, the obtained sock knitted fabric had a beautiful face and a flat feeling with little unevenness.

  The fluid-jet processed yarn of the present invention can be used for woven fabrics, and in particular when using warp yarns, may be used with a sweet twist of about 700 T / m or less, preferably about 500 T / m or less from the viewpoint of weaving properties. In addition, the fluid jetting yarn of the present invention is preferably used as a knitted fabric, and can be used as a pre-dyed yarn for flat knitting and outer jerseys for sports.

Claims (5)

  A fluid-jet processed yarn composed of a core yarn and a sheath yarn and heat-set, wherein the core yarn is composed of two or more polyester components, one component of which is a polytrimethylene terephthalate latently crimpable polyester A fluid-jet processed yarn, which is a multi-filament yarn and a sheath yarn is a non-thermoplastic fiber multifilament yarn. The fluid-jet processed yarn according to claim 1, wherein the latently crimped polyester fiber multifilament yarn satisfies the following (a) and (b).
(A) Initial tensile resistance is 10 to 30 cN / dtex
(B) Thermal shrinkage stress at 100 ° C. is 0.1 to 0.5 cN / dtex   3. The fluid jet yarn according to claim 1, wherein the non-thermoplastic fiber multifilament yarn is a cellulosic fiber multifilament yarn.   The knitted fabric comprised with the fluid jetting yarn in any one of Claims 1-3.   The textile fabric comprised with the fluid jetting yarn in any one of Claims 1-3.