JP3023017B2 - False twisted composite yarn and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-crystallinity false twist composite yarn comprising two or more filament yarns having different elongations and a method for producing the same. The false twisted composite yarn of the present invention is a false twisted composite yarn having improved heat shrinkage properties, post-process handling properties, and alkali treatment properties.

[0002]

2. Description of the Related Art When performing composite false twisting using two or more types of polyester filament yarns having different elongations, a temporary crimping and high boiling water shrinkage characteristic obtained by lowering the false twisting temperature. In a twisted two-layer structure yarn (for example, described in JP-A-63-145445), the sheath yarn has a higher boiling water shrinkage ratio than the core yarn. Causes a reversal phenomenon, and as a result, the sheath yarn with high elongation becomes the core of the yarn in the woven or knitted fabric, so that the sheath yarn becomes stiff and hard due to the large shrinkage of the sheath yarn, or the knees There has been a problem that wear fatigue such as slippage or elbow slippage is likely to occur.

[0003] To address the above problems, the present inventors have:
Previously, Japanese Patent Application No. 1-306549 proposed a false twisted composite yarn in which the boiling water shrinkage of the sheath yarn was lower than that of the core yarn, and a method for producing the same.

That is, “a false twisted composite yarn comprising two or more filament yarns having different elongations, wherein the average density of all the filaments constituting the composite yarn is 1.36 g / cm ³ or less, The filament yarn on the elongation side is made of polyester fiber, and the filament yarn on the high elongation side is made of a polyester fiber in which the crystallization rate at 120 ° C. or less is a polymer compound that is faster than that of polyester. False twisted composite yarn, wherein the boiling water shrinkage is lower than the boiling water shrinkage of the low elongation side filament yarn, and

[0005] When two or more filament yarns having different elongations are aligned and subjected to false twisting at a temperature of less than 120 ° C, a polyester fiber is used for the filament yarn on the low elongation side and the filament yarn on the high elongation side is used. A method of producing a false-twisted composite yarn, wherein a polyester fiber obtained by compounding a polymer having a crystallization rate at 120 ° C. or lower which is faster than that of polyester is used as the filament yarn.

After the development of various woven fabrics using the above false twisted composite yarn, the use of a composite fiber in which polyester and polyamide are bonded and combined to the filament yarn on the high elongation side, In the post-process such as weaving, a part of the conjugate fiber peels off and becomes fibrillated, which is likely to cause trouble. There has occurred. Also, when making a fabric using the false twisted composite yarn, if polyester is dissolved in an alkali solution and divided into ultra-fine fibers, all the composite fibers are divided almost uniformly, so that the damp and damp feeling is obtained. There was a problem that would be.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the heat shrinkage characteristics of the core-sheath yarn of the above-described low-temperature false-twisted composite false-twist yarn, and to reduce the boiling water shrinkage of the sheath yarn by the boiling water shrinkage of the core yarn. By lowering the ratio, the texture of the fabric does not become stiff in the finishing process, and it is easy to handle in the post-process, and has a feeling of ground tightness while being an ultra-fine touch. It is an object of the present invention to provide a false twist composite yarn having excellent practical performance.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, a composite fiber obtained by laminating a polyester and a polyamide, which are filament yarns on the high elongation side, to When the fiber surface is coated with polyester, fibrillation caused by friction in the subsequent process is suppressed, and the degree of division between constituent fibers is adjusted to suit the taste by fabric handling in the alkali treatment finishing process of the fabric. Finding that you can control various things,
The present invention has been reached.

Thus, according to the present invention, a false twist composite yarn comprising two or more filament yarns having different elongations, wherein the average density of all the filament yarns constituting the composite yarn is 1.36 g / cm ^3. In the following, the filament yarn on the low elongation side is made of polyester fiber, and the filament yarn on the high elongation side is a composite in which polyester and polyamide are laminated and compounded, and the fiber surface is coated with polyester. Provided is a false twisted composite yarn comprising a fiber, wherein a boiling water shrinkage of a high elongation side filament yarn is lower than a boiling water shrinkage ratio of a low elongation side filament yarn.

Further, according to the present invention, two elongations different from each other
When the filament yarns of more than one kind are aligned and false twisted at a temperature lower than 120 ° C., polyester fibers are used for the filament yarns on the low elongation side, and polyester and polyamide are used for the filament yarns on the high elongation side. Are laminated and compounded,
The present invention also provides a method for producing a false twist composite yarn, characterized by using a composite fiber having a form in which the fiber surface is coated with polyester.

As the polyester used in the present invention, polyethylene terephthalate is most suitable, but a copolymerized polyester containing isophthalic acid, sulfonic acid metal base or the like as a third component may be used. The polyester may contain a matting agent such as titanium oxide or barium sulfate, or may contain an inorganic substance such as silica.

On the other hand, nylon 6 and nylon 66 are typical examples of polyamide. These polyamides may also contain an inorganic substance such as a matting agent such as titanium oxide.

The false twist composite yarn of the present invention will be described in more detail. When two types of general polyester filament yarns having different elongations are aligned and false-twisted at a temperature lower than the crystallization temperature, a higher elongation side filament yarn than a core yarn composed of a lower elongation side filament yarn is used. The shrinkage rate of boiling water is higher in the sheath yarn composed of The reason is presumed as follows. In other words, the filament yarn on the low elongation side, that is, the higher orientation degree, tends to crystallize and be reduced in boiling water shrinkage when drawn by the draw false twisting / heat setting action, whereas the high elongation side In other words, even though the filament yarn with a lower degree of orientation is subjected to draw false twisting and heat setting, it remains as a filament with a higher elongation than the yarn with a higher degree of orientation, so the crystallinity is relatively low. , Therefore, when thrown into boiling water,
It is thought to indicate greater shrinkage.

On the other hand, in the case of the present invention, the polyamide compounded with the polyester filament yarn having a high elongation has a high crystallization rate even at a low temperature, and when subjected to the draw false twisting and heat fixing actions, , And the shrinkage rate of the polyamide component in boiling water is reduced. As a result, the polyamide acts to prevent the polyester component having a high boiling water shrinkage ratio from shrinking, and the shrinkage ratio of the sheath yarn is considered to be lower than that of the core yarn.

Here, "composite" refers to so-called composite by conjugate spinning. FIG. 1 is a schematic diagram illustrating an example of a cross-sectional shape showing a composite state of a composite fiber that can be used in the present invention.

FIGS. 1A and 1B show a cross section of the high elongation side filament yarn used in the present invention.
(A) is a composite fiber having a form in which polyester 1 and polyamide 2 are alternately laminated and laminated, but the outer peripheral surface is coated with polyester 3; and FIG. Is a composite fiber having a form in which the outer peripheral surface is coated with polyester 3 while being bonded so as to extend in the radial direction from the hollow shaft portion of the fiber in the fiber cross section. In addition, polyester 1 and polyester 3
May have the same composition or may be slightly different.

Further, since the fiber surface of the high elongation side conjugate fiber is coated with polyester, it is difficult to fibrillate even if it is rubbed or squeezed in a later step, and the handling property is remarkably improved. I do. Further, since the fiber surface is covered, the texture of the fabric can be variously controlled according to preference, and the added value of the product can be significantly increased. That is, when dissolving and dividing the conjugate fiber with the alkali liquid in the fabric finishing step, if the alkali concentration is reduced or the weight reduction treatment time is shortened, part or all of the conjugate fiber in the surface layer of the fabric is split, The conjugate fiber located in the inner layer of the fabric is only partially divided. As a result, it is possible to obtain a so-called suede-like fabric that has resilience and a feeling of ground tightness and has an extra-fine touch. Conversely, if the alkali concentration is increased to increase the weight loss, a woven fabric with a good peach texture can be obtained. As described above, it is possible to provide a variety in the finishing process of the fabric.

In particular, if a hollow portion is formed inside the conjugate fiber, alkali weight reduction and ultra-fine division proceed from the inside of the fiber, and a fabric having a complicated structure in a more divided state can be obtained. With a simple fabric configuration, a high-quality fabric that has been shed from artificial feeling can be obtained.

FIG. 2 illustrates an embodiment of the apparatus for producing the false twisted composite yarn of the present invention. The raw yarn 4 on the low elongation side uses ordinary polyester fiber and the high elongation side yarn. As the raw yarn 5, a composite fiber of polyester and polyamide having a cross section as shown in FIG. 1 is used. The raw yarns 4 and 5 are aligned and supplied to the false twisting area by the feed roller 6 and twisted by the false twisting tool 10, and the high elongation side yarn 5 is wound around the low elongation side yarn 4. And the heater 9 sets the form. However, this heat setting is performed at a temperature lower than the crystallization start temperature (120 ° C.) of the polyester, and as a result, the low density filament having an average density (hereinafter referred to as “fiber density”) of all constituent filaments of 1.36 g / cm ³ or less Is obtained.

In this step, in order to impart conjugation properties to the false-twisted composite yarn to improve handleability and fiber-mixing properties, the interlace nozzle 7 draws the yarn between the supply rollers 6 and 8 before false-twisting. The entanglement may be imparted to the obtained yarns 4 and 5, or the entanglement may be imparted after false twisting and before winding.

In order to reduce the heat shrinkage of the obtained false-twisted composite yarn and adapt it to the intended use, the false-twisted composite yarn is supplied to a second heater disposed between the take-off rollers 11 and 13. The heat setting may be performed by the use of the winding device 12, and then the film may be wound around the winding device 14. However, also in this case, it is important that the fiber density of the false twist composite yarn be kept at 1.36 g / cm ³ or less.

In the present invention, when false twisting is performed,
In order for the raw yarn 4 to be the core and the raw yarn 5 to be twisted and stretched so as to be wound around the raw yarn 4 as an outer layer portion, the difference in elongation between the raw yarns 4 and 5 must be at least 40%. .

Further, in order to obtain a composite yarn having a fiber density of 1.36 g / cm ³ or less, the polyester yarn 4 must have a spinning speed of 3
The so-called partially oriented yarn (POY) spun at 700 m / min or less is suitable, and the raw yarn 5 is preferably an undrawn yarn spun at a lower spinning speed.

The draw ratio at the time of false twisting is set in accordance with the elongation of the core yarn, and is preferably about (elongation) (times) × 0.65. In order to keep the density of the processed yarn at 1.36 g / cm ³ or less, the heater 9 is set at a temperature lower than the crystallization start temperature (120 ° C.) of the polyester, preferably lower than the glass transition temperature (85 ° C.). Especially at room temperature (2
0-30 ° C) is most preferred.

As the false twisting device 10 to be used, a disk-type or belt-type friction false-twisting device is suitable for easy threading and less thread breakage because of low-temperature processing. It may be a tool. The number of false twists is preferably as large as possible in order to sufficiently twist and stretch the outer layer yarn (sheath yarn or side yarn) 5 around the core yarn 4 and to perform torsion stretching and to generate a yarn length difference. , False twist number (T / m) =
In the formula of (32500 / √De) × α, α = 0.5 to
1.5 is preferable, and it is usually good to set α = 0.9 to 1.1.

In the case of performing false twisting using a friction false twisting tool, if the ratio of untwisting tension / twisting tension is 0.5 to 1.2 as a guide, the required number of false twists can be obtained. 0.7 to 1.0 may be employed.

In the present invention, when confounding is applied before or after false twisting, it is preferable to provide 10 to 170 confounding points / m. When confounding is applied before false twisting, false twisting or false twisting is performed. Since entanglement is easily lost by stretch false twist,
It is necessary to provide 30 or more confounding points. Usually, 40 to 120 pieces / m is appropriate. Further, it is preferable that the confounding is given by a normal pneumatic interlace nozzle.

[0029]

The composite false twisted yarn obtained as described above is subjected to false twisting at a temperature lower than the crystallization start temperature of the polyester. 1.36 g /
cm ³ or less and becomes, especially if subjected to false twisting under the following glass transition point, the fiber density is 1.35 g / cm ³ or less.

The boiling water shrinkage of the false twist composite yarn is lower in the high elongation side filament yarn made of the polyester fiber composited with the polyamide than in the low elongation side filament yarn made of the polyester fiber.

The aggregate structure of the low elongation side filament yarn and the high elongation side filament yarn as a false twist composite yarn is basically caused by deformation at the time of false twist twisting. A filament yarn is used as a core yarn, and a structure is adopted in which a filament yarn on the high elongation side where the yarn length difference is increased by the amount of twisting more than the core yarn around the core yarn. The yarn length difference generated at this time is at most 10%, but the ratio of the polyamide composite is 2%.
When it is 5% or more, the yarn is elastically recovered when false-twisted and untwisted, the yarn length difference becomes 2% or less, and a composite yarn having substantially no yarn length difference may be obtained. In addition, even when heat setting is performed after false twist untwisting, a composite yarn having substantially no yarn length difference may be obtained. In this sense, in the present invention, the filament yarn on the low elongation side is called a core yarn, and the filament yarn on the high elongation side is called a sheath yarn for convenience.

Further, since the raw yarn is subjected to only a temperature lower than the crystallization start temperature (120 ° C.) at the time of false twisting, the twist form is not substantially fixed, and the crimp ratio (TC) is at most 3 %, And usually takes a value of 1.5% or less.

Further, when entanglement is applied before or after false twisting, entanglement is applied between the low elongation side filament yarn and the high elongation side filament yarn, and the entanglement point is 5 to 150.
When the number of pieces / m is provided, the handleability and the fiber mixing property of the false twist composite yarn are improved.

Further, since the fiber surface of the high elongation side conjugate fiber is coated with polyester, it is resistant to friction and ironing, is difficult to fibrillate, and is divided between the surface of the fabric and the inner layer during ultrafine division by alkali treatment. Since the speed changes greatly, various fabric structures can be formed.

[0035]

According to the present invention, the heat resistance of a low-crystal false twisted composite yarn comprising two or more filament yarns having different elongations and subjected to composite false twisting at a temperature lower than the crystallization start temperature of the polyester fiber. Shrinkage characteristics can be improved. That is, since the high elongation side filament yarn is a composite yarn of polyester and polyamide, the boiling water shrinkage after false twisting can be made lower than that of the low elongation side polyester yarn, and as a result, the cloth is hard and stiff. It is possible to prevent the feeling of feeling and to eliminate concerns about wearing fatigue such as elbows and knees when wearing.

Further, the handleability in the post-process can be remarkably improved, and the texture of the fabric can be obtained with an ultra-fine touch, and a high-class feeling with repulsion and ground-tightness can be obtained.

[0037]

Hereinafter, the present invention will be described in detail with reference to examples. In the examples, the measurement of the yarn characteristics was performed by the following method. Using a density (δ) density gradient tube of the yarn , 2 in n-heptane / carbon tetrachloride.
It was measured at 5 ° C.

A skein of about 3000 denier was prepared by applying a light load of 2 mg / de and a heavy load of 0.1 g / de to the length L after 1 minute.
After reading _O , immediately remove the heavy load and put it in boiling water with the light load applied, remove it after 20 minutes, remove the light load, and air dry for 24 hours. A light load and a heavy load are again applied to this, and the length L ₂ after one minute has elapsed is read.
Length L after 1 minute immediately after removing heavy load
Read ₃ . The crimp rate and boiling water shrinkage rate are calculated by the following equations.

Example 1 Elongation 125 obtained by melt-spinning polyethylene terephthalate (intrinsic viscosity in ortho-chlorophenol measured at 25 ° C. is 0.64) at a speed of 3300 m / min.
%, A multifilament yarn of 50 denier 12 filaments having a density of 1.344 g / cm ³ and the above-mentioned polyethylene terephthalate and nylon 6 (intrinsic viscosity in meta-cresol measured at 35 ° C. of 1.28) was 50: 50
235% elongation, density 1.206 g / cm obtained by conjugate spinning at a spinning speed of 1500 m / min.
^3. A multi-filament yarn of 66 denier 20 filaments of 48 layers per filament (shape of FIG. 1 (b)) was aligned and interlaced under the conditions of an overfeed rate of 1% and a pneumatic pressure of 3 kg / cm ^2. Leading to the nozzle,
After confounding 60 pieces / m, at room temperature (25 ° C.), the draw ratio was 1.45 times, and the disk surface speed of the friction false twist device was 2.1 times the yarn speed, and the processing speed was 250 m / min. It was stretched and false-twisted and wound up.

The physical properties of the obtained false-twisted composite yarn are as shown in Table 1. With regard to the boiling water shrinkage, the sheath yarn or side yarn (filament yarn having higher elongation) is lower than the core yarn. Was.

[Table 1]

Using the obtained false-twisted composite yarn, a twist number of 600 turns / m is applied as a warp in the right-handed direction, and then at 65 ° C.
And glued. Also, as the weft, 600 turns in the right twist direction /
m of twist. Next, the density was 63 birds / 3.79 cm
5 reeds, the weft density was 133 over / 3.79 cm, and the weaving machine was woven with five satins.

The heavy machine obtained as described above is put into a high-pressure rotary washer at room temperature, and relaxed at 130 ° C.
And relaxed for 20 minutes. In this relaxing step, the fabric shrank by 44% in surface area with respect to the heavy equipment. After the relaxing step, the substrate was pre-set at 190 ° C. for 45 seconds, and then buffed with # 400 sandpaper. Then the concentration 18
After performing a 15% weight reduction process in a g / liter alkaline solution to split the composite fiber on the surface of the woven fabric, a finishing process was performed through a dyeing process.

In the weaving process, the composite fiber obtained by laminating the polyester and the polyamide did not fibrillate, and the yarn breakage was as good as ordinary filaments.

When the state of division of the bonded conjugate fiber by the alkali treatment was examined, it was found that the woven fabric surface had a thickness of about 100%.
It was divided into about 70% in the inner layer part of the fabric, and there were some parts where alkali dissolution had progressed from the surface and some parts where dissolution had progressed from the hollow part of the vacuum. .

The obtained woven fabric was a suede-like woven fabric having a suede-like surface touch, a repellency and a feeling of ground tightness, and a sense of quality.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a composite form of a fiber in which polyester and polyamide used in the present invention are composited.

FIG. 2 is a schematic view illustrating an apparatus for implementing the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polyester 2 Polyamide 3 Polyester 4 Low elongation side filament yarn 5 High elongation side filament yarn 6 Feed roller 7 Interlace nozzle 8 Feed roller 9 False twist set heater 10 False twist tool 11 Pull-off roller 12 Heat treatment heater 13 Take-off Roller 14 Winding device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-167333 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02G 1/02 D02G 3/04 D02J 1 / 00 F-term theme code 4L036

Claims (4)

(57) [Claims] 1. A false twist composite yarn comprising two or more filament yarns having different elongations, wherein the average density of all the filament yarns constituting the composite yarn is 1.36 g / cm ³ or less. The filament yarn on the elongation side is made of polyester fiber, and the filament yarn on the high elongation side is made of a composite fiber in which polyester and polyamide are laminated and compounded, and the fiber surface of the composite is coated with polyester. A false twist composite yarn, wherein the high elongation side filament yarn has a lower boiling water shrinkage ratio than the lower elongation side filament yarn. 2. The false twist composite yarn has 5 to 150 entanglement points / m.
A false twisted composite yarn according to claim 1 which is present. 3. When two or more filament yarns having different elongations are aligned and false twisted at a temperature of less than 120 ° C., polyester fibers are used as the low elongation side filament yarns, and the high elongation side is used. A method for producing a false twisted composite yarn, characterized in that a polyester fiber and a polyamide are laminated and composited on the filament yarn, and a composite fiber having a form in which the fiber surface of the composite is coated with polyester is used. 4. The method according to claim 1, wherein the yarn before or after false twisting is 10-170.
The method for producing a false-twisted composite yarn according to claim 3, wherein the number of entanglement points is given.