JPH10183438A - Splittable conjugate false-twisted yarn and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an improved splittable conjugate yarn not generating a snag and a pill on the split lobe filaments of the conjugate filament, even when the splittable conjugate yarn is used for a fabric weak in a tissue-binding power, and to provide a method for producing the conjugate yarn. SOLUTION: This conjugate false-twisted yarn comprises a core filament and side filaments entangled around the core filament. Therein, the side filaments are formed from a polyester composition comprising a polyester and an organic compound incompatible with the polyester, and comprises a filament yarn thick and thin in the longitudinal direction and having a multi-lobal cross section. The joined parts of the lobes in a fine part can selectively be split with a false-twisting strain.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite false-twisted yarn having splitting properties and capable of expressing a strong squeaky feeling and a dry touch feeling, and a method for producing the same.

[0002]

2. Description of the Related Art The present inventors have previously described Japanese Patent Application No. 8-180.
No. 634 proposes a composite false-twisted yarn capable of expressing a novel dry and squeaky feeling, such as wild silk, or a unique synthetic fiber by modifying the side cross-sectional shape of the polyester fiber, and a method for producing the same.

[0003] It is not microscopic enough to generate fine streaky voids on the surface of the fiber, but rather like a ria coast, where the cross section of the fiber is more severely eroded. A fiber surface morphology that appears as a sharp ridge when looking at the jagged in and out in the fiber axis direction, and furthermore, the irregular type in which the ingress and egress of the ria coast changes intricately between the fibers and within the fiber By doing so, it is based on the inventive idea of expressing a strong squeaky feeling in addition to a dry feeling.

[0004] The above invention is directed to a composite false twist yarn comprising a core yarn and a side yarn entangled around the core yarn, wherein the side yarn is formed of a polyester and an organic compound incompatible with the polyester. A splittable composite false-twisted yarn, comprising a multilobed cross-section filament yarn which is made of a polyester composition, and is provided with splitting properties at the joint base of each lobe by false twisting strain. In a method for producing a composite false twisted yarn in which polyester multifilament yarns having a difference in elongation of at least one kind are combined and false-twisted or drawn false-twisted, the polyester and the polyester are non-woven yarns on the high elongation side. A polyester composition comprising a compatible organic compound and a polyester multifilament yarn having a multilobe fiber cross section. It was a method of manufacturing a Splitting composite false twisted yarn to be.

[0005] Thereafter, in the process of developing various garments using the woven or knitted fabric composed of the splittable composite yarn, in the case of a fabric having a weak tissue binding force, that is, the composite yarn is untwisted or sweet-twisted, Moreover, in the case of a knitted fabric having a twill structure or a satin structure or a knitted fabric having a rough structure, if the split lobe portion of the splittable composite yarn is caught while wearing clothes, it appears on the surface of the fabric without slipping, resulting in a snag or the like. It has been found that pilling may occur, and it is necessary to solve this problem in order to use the composite yarn as a versatile material.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to prevent a split lobe filament of the composite yarn from snagging or pilling even when the splittable composite yarn is a fabric having a weak tissue binding force. It is an object of the present invention to provide an improved split composite yarn and a method for producing the same.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a splittable multi-lobed filament component along the length direction of a splittable composite false-twisted yarn. The invention is based on the idea of preventing the propagation of snags and pillings by imparting selective splitting properties to form a portion provided with a portion and a portion not provided with the portion.

Further, in the method for producing splittable composite false twisted yarn, a multilobed filament yarn having a thickness along the length direction is used as the yarn on the high elongation side, so that the splittable yarn is finely divided. The invention is based on the idea of imparting selective splitting properties in such a manner that the false twist strain is concentrated and not concentrated on the thick part.

Means for solving the problems of the present invention, which embody such an inventive idea, are as follows.

(1) A composite false twist yarn comprising a core yarn and a side yarn entangled around the core yarn, wherein the side yarn is a polyester comprising a polyester and an organic compound incompatible with the polyester. A filament yarn composed of the composition, which is thick in the length direction and has a multi-lobed cross section, characterized in that the joint base of each lobe in the details is imparted with selective splitting property by false twist strain. And (2) a method for producing a composite false-twist yarn in which two or more polyester multifilament yarns having a difference in elongation are combined and false-twisted or drawn false-twisted.
As the yarn on the high elongation side, the polyester is composed of a polyester composition comprising a polyester and an incompatible organic compound, and has a multilobe fiber cross section in a cross section direction, and has a length direction. The method for producing splittable composite false twist yarn, comprising using a polyester multifilament yarn having a large thickness.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The composite false twist yarn of the present invention comprises a composite yarn comprising a core yarn and side yarns (so-called thick and thin yarns) which are wrapped around the core yarn and which are thick and thin in the length direction. A false twist yarn, wherein the side yarn is formed of a polyester composition comprising polyester and an organic compound incompatible with the polyester. At that time, the incompatible organic compound is used in view of the splitting property and strength of the fiber, dyeing property, etc.
It is preferable that it is composed of at least one compound selected from the group consisting of the following general formulas (I), (II) and (III).

[0012]

Embedded image

Wherein Z is an organic compound residue having 1 to 6 active hydrogens, R ¹ is an alkylene group having 6 or more carbon atoms,
R ² is a hydrogen atom, a monovalent hydroxy hydrocarbon group having 1 to 40 carbon atoms, or a monovalent acyl group having 2 to 40 carbon atoms, and k is 1
An integer from 1 to 6, l is an integer such that k × l is 70 or more, and m is 1
Represents the above integer. )

[0014]

Embedded image RSO ₃ M (II)

(In the formula, R represents an alkyl group having 3 to 30 carbon atoms or an aryl group having 7 to 40 carbon atoms, and M represents an alkali metal or an alkaline earth metal.)

[0016]

Embedded image RSO ₃ PR ₁ R ₂ R ₃ R ₄ ... (III)

(In the formula, R is the same as the definition of R in the formula (II), and R ₁ R ₂ R ₃ R ₄ is an alkyl group or an aryl group.)

The content of the organic compound in the polyester matrix is preferably 0.1 to 10% by weight. If it is less than 0.1% by weight, the splitting properties of the side yarn fibers cannot be obtained, and if it exceeds 10% by weight, the strength of the side yarn fibers decreases,
A problem is the decrease in color fastness.

Each filament constituting the side yarn of the composite false twisted yarn has a multilobe cross section deformed by false twisting, and in the detail thereof, selectively splits at the joint base of each lobe due to false twisting. It has nature.

Here, the splitting property means that when the composite false twisted yarn is treated with an alkaline solution, due to the strain inherent in the constituent fibers, the fibers have a plurality of irregular shapes and the splitting surface has an uneven cross-section like a ria coast. The property of splitting to have The splitting of the composite fiber obtained by bonding different kinds of polymers at the bonding surface is different from the splitting property, and is not included in the present invention.

The number of lobes in the multi-lobe section is preferably 2 to 8, more preferably 3 to 5. If it is less than 2, the splitting properties of the side yarn fibers are insufficient, and if it exceeds 8, the splitting of the side yarn fibers becomes too fine, and the feeling of creaking is insufficient.

Here, the multi-lobe section is shown in FIG.
(A) As shown in (b), a form having a concave portion on the outer periphery of the fiber cross section toward the cross section, that is, the intersection angle θ of the tangent drawn along the outer circumference becomes 180 degrees or more as measured from the inside of the cross section. A fiber cross section having such a concave shape.

The single fiber fineness of the multilobe cross section fiber is
Preferably 0.8-5 denier, more preferably 1-3
Denier. If it is less than 0.8 denier, the splittable single-fiber fineness will be thin, and the texture will be insufficient. If it exceeds 5 denier, the texture will be coarse and hard.

The distribution of the thick portion and the fine portion may be unevenly distributed in the thick portion or the fine portion between the multifilaments, or may be mixed, as viewed in the cross-sectional direction of the multifilament of the side yarn. . When viewed in the length direction of each constituent filament of the side yarn, the length of the details is preferably in the range of 0.5 cm to 5 cm, and particularly preferably in the range of 1 cm to 2.5 cm.
If it is less than 0.5 cm, the split length is short and the feeling of squeaking is insufficient, and if it exceeds 5 cm, the effect of preventing snagging and pilling becomes insufficient. The length of the thick part is preferably in the range of 0.3 cm to 5 cm, and particularly preferably in the range of 1 cm to 2.5 cm. If it is less than 0.3 cm, the effect of stopping the propagation of snags and pilling is insufficient, and if it exceeds 5 cm, the feeling of squeaky feeling is insufficient.

[0025] The multifilament yarn having such a thickness is formed by subjecting the undrawn yarn obtained by melt spinning to a temperature lower than the glass transition point of the undrawn yarn, more preferably at room temperature.
It is obtained by stretching the undrawn yarn at a draw ratio less than the natural draw ratio.

The yarn structure of the composite false twist yarn of the present invention is shown in FIG.
As shown in (a), (b), and (c), the side yarn S
Is wound around the core yarn C by alternate twisting and entangled, the side yarn S is tangled along the side surface of the core yarn C, or those structures are arranged in the length direction of the composite false twisted yarn. It is preferable to use a yarn structure that has a structure in which the fibers are mixed and entangled, and prevents the occurrence of neps due to ironing during false twisting or during handling in a subsequent process. Further, in a composite false twisted yarn having a structure in which the side yarn S is not wound around the core yarn C in an alternately twisted shape and is tangled along the side surface of the core yarn C, the side yarn S is applied around the core yarn C so that the side yarn S is wound around the core yarn C. When used as a wound structure, the weaving and weaving properties are improved.

As the core yarn of the composite false twist yarn of the present invention, a polyester multifilament yarn is preferable. In addition to polyethylene terephthalate fiber, a copolymer component based on the main acid component and / or glycol component constituting the polyester is 5 to 5%. Polyester fibers copolymerized at 18 mol% are preferred. As the copolymerization component, isophthalic acid, bisphenol A or an ethylene oxide adduct thereof is preferable. The heat shrinkage required for the core yarn may be determined from the relationship with the bulkiness required for the woven or knitted fabric, and the type of polyester fiber may be appropriately selected.

When the composite false twisted yarn of the present invention is treated with an alkali solution, a part of a detailed joint root portion is split when viewed in the cross-sectional direction of the multi-lobe cross-sectional fiber constituting the side yarn. In the details of the split, as shown in the schematic diagram of FIG. 3, the split is split at the joint base of each lobe, and the split surface R has irregularities like a rias coast, and the shape becomes an irregular shape according to the split site. .
The split surface R appears on the inside or the surface of the woven or knitted fabric due to the false twist crimping of the side yarn and the heat shrinkage of the core yarn, and a strong squeaky feeling, which is difficult with conventional fibers, is obtained.

On the other hand, at this time, when viewed along the length direction of the multilobe cross-section fiber constituting the side yarn, the thick part and the details are split as described above, and the thick part is almost split. do not do. This is attributable to the difference in the internal microstructure of the fiber between the thick part and the detail. That is, since the details have a high orientation in the fiber axis direction, false twist strain is concentrated at the base of each lobe joint of the multilobe section to impart splitting properties, and the thick part has a low orientation in the fiber axis direction, Even if the false twist deformation is large, the concentration of false twist strain at the base of each lobe joint is small, and almost no splitting property is imparted.

In addition, the above-mentioned alkali solution treatment simultaneously removes incompatible organic substances on the surface of the side yarn fibers, generates streaky grooves along the fiber axis direction, and gives a dry feeling. Further, fibrils can also be generated on the side yarn fiber surface by rubbing the surface of the composite false twisted yarn during or before or after the alkali solution treatment. The alkali solution treatment may be performed after forming the composite false twist yarn or woven or knitted fabric, but the woven or knitted fabric has better processability.

Next, the method for producing the splittable false false twist yarn of the present invention will be described in detail. In a method for producing a composite false twisted yarn in which two or more kinds of polyester multifilament yarns having a difference in elongation are combined and false-twisted or drawn false-twisted, polyester and the polyester are used as yarns on the high elongation side. A polyester multifilament yarn comprising a polyester composition comprising an incompatible organic substance is used.

Here, as the incompatible organic substance, the organic substance described above in the embodiment of the composite false twist yarn of the present invention is used. Further, it is necessary that the high elongation side yarn has a multi-lobed fiber cross section. Further, the degree of irregularity of the multilobe section is preferably in the range of 2 to 4, and more preferably in the range of 2.4 to 3.5.

In the manufacturing method of the present invention, the degree of irregularity of the cross-sectional shape is defined as the radius of a circle circumscribing the cross-sectional shape of the filament as r1, the radius of the inscribed circle as shown in FIGS. Is defined as r1 / r2, that is, the ratio of the radius of the circumscribed circle to the radius of the inscribed circle when r is r2. The closer this value is to 1.0, the closer the cross-sectional shape is to a circle, and the greater the value, the sharper the cross-sectional shape.

However, when the cross section has a circular hollow portion in the cross section, the degree of irregularity is determined by the difference between the radius of the inscribed circle and the radius of the hollow portion when the radius of the hollow portion is r3. It is defined by the ratio of the radii, ie, r1 / (r2-r3). When the hollow portion is not circular, and when there are two or more hollow portions, the radius of the hollow portion when the circular hollow portion having the same area as the entire area of the hollow portion is assumed to be at the center of the cross section is r3.

If the degree of irregularity is less than 2.0, the concentration of the filaments constituting the side yarn is less likely to be concentrated when pressure is applied, and the object of the present invention is not achieved because of insufficient splitting. When the degree of irregularity exceeds 4.0, the spinning process becomes poor, which is not preferable.

In this case, when the number of protrusions is less than two, the stress is less likely to concentrate on the joint root of the curve when pressure is applied even if the degree of irregularity is 2.0 or more.
Since the splitting property is insufficient, the texture desired by the present invention cannot be obtained. On the other hand, if the number of protrusions increases, it becomes difficult to obtain a squeaky texture, so the number of protrusions is particularly 3 to
Five ranges are preferred.

A method for imparting splitting property to a composite false twist yarn will be described with reference to FIG. 5 showing one embodiment of the above method. The yarn (A) on the high elongation side having a large thickness is
The yarn is combined with the low elongation side yarn (B), mixed and entangled by the entanglement nozzle (2), and supplied to the false twisting area via the supply roller (3). Here, in the composite yarn mixed and entangled, the high elongation side yarn is relatively shifted to the outer layer portion, the low elongation side yarn is relatively shifted to the inner layer portion by false twisting, and both yarns It becomes a composite yarn having entanglement at the interface of the strip.

At this time, since the yarn on the high elongation side has a multilobe-shaped cross section (for example, FIG. 6 (a)), in detail, twisting, compression, shearing, etc. of twist deformation at the joint base of each lobe. The force acts intensively, causing internal strain or rupturability at the interface between the polyester matrix at the joint root of the multilobe cross section and the fine particles of the incompatible material, which can be preferentially split by alkali solution treatment (for example, FIG. 6 (b)). And
The state after the alkali solution treatment is as shown in FIG.

Here, as the yarn on the high elongation side, a low-oriented undrawn yarn or a highly-oriented undrawn yarn having a large thickness is used. On the other hand, as the yarn on the low elongation side, a highly oriented undrawn yarn or a drawn yarn is used.
False twisting is preferable because stretch false twisting can be performed and high-speed false twisting can be performed using a friction false twisting tool. The stretchable yarn is a speed of 2500 to 3500 m / min. So-called P spun with
OY, 4500 m / min. So-called U spun before and after
SY, a spun drawn yarn having an elongation of 50% or more.

On the other hand, as the low elongation side yarn, a polyester multifilament yarn is preferable. In addition to polyethylene terephthalate fiber, a copolymer component based on the main acid component and / or glycol component constituting the polyester is 5 to 5. Polyester fibers copolymerized at 18 mol% are preferred. As the copolymerization component, isophthalic acid, bisphenol A and its ethylene oxide adduct are preferable.

Since the polyester obtained by copolymerizing the copolymer component generally has a high heat shrinkage, the heat shrinkage of the composite false twist yarn can be increased, and a woven or knitted material having a high bulk can be obtained.

The false twist condition of the composite false twist is determined from the viewpoint of imparting splitting properties to the high elongation side yarn. The higher the number of false twists, the better. In the following formula (1),

[0043]

(Equation 1)

(Where α is the twist coefficient, T is the number of false twists (T /
m), De is the fineness (denier) of the composite false twisted yarn

The twist coefficient α is set to 0.85 to 1.3, or the friction false twist D / Y (the ratio of the surface speed of the false twist disk to the yarn speed) is set to 1.8 to 2.2. Is preferred.

The heater temperature is preferably from 100 to 190 ° C., and more preferably from 120 to 160 ° C. from the viewpoint of imparting splitting properties. The draw ratio is 65% to 8% of the cut elongation of the low elongation side yarn.
The draw ratio is preferably 0%, but a higher draw ratio is preferable from the viewpoint of imparting splitting properties.

It is preferable that the confounding is applied to the composite false twisted yarn from the viewpoint of improving the yarn workability and the handleability in the post-process. For this purpose, it is preferable to impart the confounding before and / or after the false twisting. Interlaced nozzles and Taslan nozzles are suitable as interlacing tools. The number of interlaces is 40-120
Pcs / m is preferred.

[0048]

【Example】

Example 1 A polyethylene terephthalate polymer to which 1.5 parts by weight of a polyoxyethylene-based polyether was added as a high elongation side yarn was spun at a speed of 1100 m / min using a spinneret for a triangular cross-section yarn. 2.9 degree trilobal cross section, elongation 310%, 170 denier, 3
Undrawn 6 filaments were obtained. This undrawn yarn is drawn at room temperature at a draw ratio of 1.2 times to give an elongation of 240%
A 0-denier, 36-filament thick and thin semi-drawn yarn was obtained.

On the other hand, a polyethylene terephthalate polymer obtained by copolymerizing 12% by mole of isophthalic acid was spun at a speed of 3300 m / min as a low elongation side yarn, and the elongation was 11 mm.
A 5%, 125 denier, 12 filament, highly oriented undrawn yarn was obtained.

These two yarns were aligned and processed in the process shown in FIG. Entangling was performed using an interlace nozzle under the conditions of compressed air pressure of 2 kg / cm ² and overfeed rate of 2%. Subsequently, a heater temperature of 130 ° C. and a stretching ratio of 1.
6 times, surface speed of circumscribed friction false twist disk 600
m / min. At a processing speed of 300 m / min. The composite false twist was performed.

In the obtained composite false twisted yarn, the yarn of the low elongation side becomes the core, the yarn of the high elongation side becomes the side yarn, and the yarn is entangled, and the interface between the core yarn and the side yarn is entangled. It was a structure having. The characteristics of the yarn include a yarn length difference of 16% between the core yarn and the side yarn, and a crimp ratio of 5.5.
%, Boiling water shrinkage 9%, strength 2.8 g / de, elongation 20
%, The number of entanglements was 50 / m, and the trilobal cross section of the side yarn was subjected to false twist deformation.

Next, 1300 T was applied to the obtained composite false twisted yarn.
/ M twisted, woven in a 2/2 twill texture, relaxed (100 ° C, 25 minutes treatment), preset (180 ° C,
45 seconds treatment), alkali weight loss (NaOH 35 g / l solution, 97 ° C treatment, weight loss rate 23%), dyeing (130 ° C, 4%
The fabric was finished by performing a final set (treatment at 160 ° C. for 45 seconds) for 5 minutes.

On the surface of the finished woven fabric, splits and streak-like micropores were observed at the base of the lobe joint in the details of the side yarns of the composite false twisted yarn, and there were also fibrillated portions, which gave a strong squeaky feeling. A soft touch of fibrils was added to the texture, resulting in a spun rayon-like fabric with a strong squeaky texture. In addition, almost no splitting was observed in the thick part of the side yarn. Despite the sweet twisted twill fabric, both snags and pillings were 4.5 grades (5 grades were the best and 3.5 grades or more passed. ), And a woven fabric with improved snug and pilling that can withstand practical use was obtained.

[0054]

According to the composite false twisted yarn of the present invention, the side yarn filament has a multi-lobe cross section and is thick and thin in the length direction. , At least a part of the lobes of the multilobe is split at the base of the joint by the alkali solution treatment to form an irregular shaped uneven split surface, and a woven or knitted fabric having a strong squeaky feeling is obtained.

Since the incompatible organic compound is dispersed in the form of particles in the polyester matrix, the alkali solution treatment produces elongated grooves along the filament axis direction on the filament surface, and a dry feeling is added. You. Furthermore, during or before or after the alkali solution treatment, the surface of the side yarn filaments can be fibrillated by rubbing the surface of the composite false twisted yarn to add a fibril feeling.

According to the method for producing a composite false twist yarn of the present invention,
Splitting property due to false twisting can be imparted to the base of each lobe joint of the multifilament of the composite false twist side yarn. On the other hand, along the length direction of the side yarn filament, the false twist is not concentrated at the joint base of each lobe at the thick part and has almost no splitting property. Without this, the propagation of snags and pilling can be prevented and improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a multi-lobe cross section according to the present invention.

FIG. 2 is a side view showing a state in which side yarns are tangled around a core yarn in the composite false twist yarn of the present invention.

FIG. 3 is a perspective view exemplifying a split state that appears at the base of a lobe joint of side yarn fibers when the composite false twist yarn of the present invention is treated with an alkaline solution.

FIG. 4 is a cross-sectional view illustrating the degree of irregularity referred to in the present invention.

FIG. 5 is a diagram showing a production process of the composite false twist yarn of the present invention.

FIG. 6 is a perspective view exemplifying a state in which the cross section of the side yarn multilobe fiber of the composite false twisted yarn of the present invention changes from the original yarn (A) to after the composite false twisting (B).

[Explanation of symbols]

 A: High elongation side yarn B: Low elongation side yarn 1 ... Supply roller 2 ... Entanglement processing nozzle 3 ... Supply roller 4 ... Heater 5 ... Friction false twist device 6 ... Take-up roller 7: Winding device S: Side yarn of composite false twist yarn C: Core yarn of composite false twist yarn R: Splitting surface of multilobe filament

Claims (2)

[Claims] 1. A composite false twist yarn comprising a core yarn and a side yarn entangled around the core yarn, wherein the side yarn is a polyester composition comprising a polyester and an organic compound incompatible with the polyester. A filament yarn having a multi-lobed cross-section in the length direction, wherein the bonding base of each lobe in the details is imparted with a selective splitting property by false twist strain. Splittable composite false twist yarn. 2. A method for producing a composite false twisted yarn in which two or more kinds of polyester multifilament yarns having a difference in elongation are combined and false-twisted or drawn false-twisted. And a polyester composition comprising the polyester and an incompatible organic compound, and a polyester multifilament yarn having a multilobe-shaped fiber cross section in a cross-sectional direction and having a fineness in a length direction. A method for producing splittable composite false twist yarn, comprising using