JP3502518B2 - Splittable false false twist 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 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 filed Japanese Patent Application No. 8-180.
In the specification of No. 634, a composite false twisted yarn capable of expressing a new dry and squeaky feeling like wild silkworm or a unique synthetic fiber by modifying the side cross-sectional morphology of polyester fiber and a method for producing the same have been proposed.

It is not as microscopic as the generation of minute streak-like voids on the surface of the fiber, but as if the cross section of the fiber was eroded more roughly, as if it were a rias type coast. When the indented entrance and exit is seen in the fiber axis direction, it forms a fiber surface morphology that appears as an acute ridge line, and furthermore, the ingress and egress of the rias type coast is an irregular shape that changes intricately between fibers and within fibers. This was based on the inventive idea of expressing a strong squeaky feeling in addition to a dry feeling.

The above invention is a composite false twisted yarn comprising a core yarn and a side yarn entwined around the core yarn, wherein the side yarn comprises polyester and an organic compound incompatible with the polyester. Which is a filament yarn having a multilobe cross-section, which is composed of the polyester composition described above, and which is provided with splitting property at the joint root portion of each lobe by false twisting strain. In a method for producing a composite false-twisted yarn in which false-twisted or drawn false-twisted yarns are obtained by combining polyester multi-filament yarns having a difference in elongation of at least one kind, polyester and the polyester are not A polyester multifilament yarn composed of a polyester composition comprising a compatible organic compound and having a multilobed fiber cross section is used. It was a method of manufacturing a Splitting composite false twisted yarn to be.

After that, in the process of developing various garments using the woven and knitted fabric made of the splittable composite yarn, in the case of a cloth having a weak tissue restraining force, that is, the composite yarn is untwisted or sweet twisted. Moreover, when a twill or satin woven fabric or a coarse knitted fabric is used, the cleaved lobe portion of the splittable composite yarn appears slippery on the surface of the fabric when it is caught on clothes, and snags and It was found that pilling might occur, and it was necessary to solve this problem in order to use the composite yarn as a versatile material.

[0006]

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

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, along the length direction of a splittable false-twisted yarn, a filament component having a multilobe cross section of a side yarn is splittable at a joint root portion of each lobe due to false-twisting strain. It is based on the inventive idea of preventing the propagation of snags or pillings by imparting selective cleaving properties so as to form a portion provided with and a portion not provided.

Further, in the method for producing a splittable false false-twisted yarn, by using a multi-lobe type filament yarn having a thickness along the length direction as a yarn on the high elongation side, the fine splitting property can be obtained. It is based on the inventive idea of imparting selective cleaving properties in such a manner that the false twist strain is concentrated and not concentrated in the thick portion.

The means for solving the problems of the present invention, which embodies such an inventive idea, is as follows.

(1) In a composite false twisted yarn comprising a core yarn and side yarns wrapped around the core yarn, the side yarns are polyesters and polyesters made of an organic compound incompatible with the polyesters. A filament yarn composed of a composition, which is thin in the length direction and has a multi-lobe cross section, wherein the joint root portion of each lobe in detail has a selective splitting property due to false twist strain. In the method for producing a composite false-twisted yarn, which comprises splitting the false-twisting composite yarn, and (2) two or more kinds of polyester multifilament yarns having different elongations, and false-twisting or drawn false-twisting,
The yarn on the high elongation side is composed of polyester and a polyester composition composed of an organic compound incompatible with the polyester, and has a multi-lobe fiber cross section in the cross direction, A method for producing a splittable false false-twisted yarn, characterized in that a thick and thin polyester multifilament yarn is used for.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The composite false-twisted yarn of the present invention comprises a core yarn and a side yarn (a so-called thick and thin yarn) which is entangled around the core yarn and has a thickness in the length direction (so-called thick and thin yarn). The false twisted yarn, wherein the side yarn is composed of a polyester composition including polyester and an organic compound incompatible with the polyester. At that time, the incompatible organic compound, fiber splitting and strength, from the point of dyeability,
It is preferably composed of at least one compound selected from the group consisting of the following general formulas (I), (II) and (III).

[0012]

[Chemical 1]

(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 hydroxyhydrocarbon group having 1 to 40 carbon atoms, or a monovalent acyl group having 2 to 40 carbon atoms, and k is 1
~ 6 integer, l is an integer such that k × l is 70 or more, m is 1
Represents the above integers. )

[0014]

[Chemical formula 2] 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]

[Image Omitted] 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 above 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 property of the side yarn fiber cannot be obtained, and if it exceeds 10% by weight, the strength of the side yarn fiber is decreased.
A problem is that the dyeing fastness is lowered.

Further, each filament constituting the side yarn of the composite false-twisted yarn has a multilobe cross section deformed by false-twisting, and due to false-twisting distortion, the details thereof are selectively cleaved at the joint root of each lobe. Have sex.

The term "splitability" as used herein means that, when the composite false twisted yarn is treated with an alkaline solution, the fibers have a plurality of irregular shapes due to the internal strain of the constituent fibers, and the split surface has an uneven cross-sectional shape as if it were a rias coast. Says the property of splitting to have. It should be noted that what the composite fiber obtained by bonding different kinds of polymers divides at the bonding surface is different from the splitting property here and is not included in the present invention.

The number of lobes in the multi-lobe section is preferably 2-8, more preferably 3-5. If it is less than 2, the fine splitting property of the side yarn fibers is insufficient, and if it is more than 8, the split yarns of the side yarn fibers are too fine and the squeaky feel is insufficient.

Here, the multi-lobe section is shown in FIG.
As shown in (a) and (b), the fiber has a concave portion on the outer circumference of the cross section of the fiber, and the crossing angle θ of the tangent line drawn along the outer circumference is 180 degrees or more when measured from the inside of the cross section. A fiber cross section having such a concave form.

The single fiber fineness of the multi-lobe cross-section fiber is
Preferably 0.8-5 denier, more preferably 1-3
It is denier. When it is less than 0.8 denier, the splitting single fiber fineness becomes thin and the squeaky feeling is insufficient, and when it exceeds 5 denier, the texture becomes coarse and hard.

The distribution of the thick part and the detail may be unevenly distributed in the thick part or the detail among the multifilaments as viewed in the cross-sectional direction of the multifilament of the side yarn, or may be mixed. . When viewed in the length direction of each constituent filament of the side yarn, the length of the detail 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 squeaky feeling is insufficient, and if it exceeds 5 cm, the effect of preventing snag and pilling becomes insufficient. The length of the thick part is preferably 0.3 cm to 5 cm, and particularly preferably 1 cm to 2.5 cm. If it is less than 0.3 cm, the effect of stopping the propagation of snag and pilling is insufficient, and if it exceeds 5 cm, the squeaky feeling is insufficient.

The multifilament yarn having such a large and thin thickness is obtained by melt-spinning an unstretched yarn at a temperature lower than the glass transition point of the unstretched yarn, more preferably at room temperature.
It is obtained by drawing at a draw ratio less than the natural draw ratio of the undrawn yarn.

The yarn structure of the composite false twisted yarn of the present invention is shown in FIG.
As shown in (a), (b), and (c), the side thread S
Is a structure in which the core yarn C is wound around by alternate twisting and bundled, the side yarn S is bundled along the side surface of the core yarn C, or those structures are arranged in the length direction of the composite false twisted yarn. A yarn structure having a mixed and entangled structure, which prevents the occurrence of nep due to ironing during false twisting or during handling in a subsequent step is preferable. Further, in the case of the composite false twisted yarn having a structure in which the side yarn S is not wound around the core yarn C in an alternate twisted yarn shape but is wrapped around along the side surface of the core yarn C, the side yarn S is wound around the core yarn C by additional twisting. When used as a structure wound around, the weaving and weaving properties are improved.

As the core yarn of the false-twisted composite yarn of the present invention, polyester multifilament yarn is preferable, and in addition to polyethylene terephthalate fiber, 5 to 5 copolymer components based on the main acid component and / or glycol component constituting the polyester are used. 18 mol% copolymerized polyester fibers 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 material, and the type of polyester fiber may be appropriately selected.

When the composite false-twisted yarn of the present invention is treated with an alkaline solution, a part of the splicing root portion of the details is split when viewed in the cross-sectional direction of the multi-lobe cross-section fiber constituting the side yarn. As shown in the schematic diagram of FIG. 3, in the split details, splits are made at the joint roots of the lobes, and the split surface R has irregularities such as a rias coast, and the shape also becomes an irregular shape depending on the split site. .
The split surface R is developed inside or on the surface of the woven or knitted fabric due to the false twist crimping of the side yarns or the heat shrinkage of the core yarns, and a strong squeaky feeling, which is difficult with conventional fibers, is obtained.

On the other hand, at that time, when viewed along the length direction of the multi-lobe cross-section fibers constituting the side yarns, among the thick portions and the details, the details are split as described above, and the thick portions are almost split. do not do. This is due to the difference in the fiber internal microstructure between the thick and fine parts. That is, since the details have high orientation in the fiber axis direction, false twist strain is concentrated on each lobe joint root of the multi-lobe cross section to impart splitting properties, and the thick portion has low orientation in the fiber axis direction. Even if the false twist deformation is large, the false twist strain is not concentrated at the root of each lobe joint, and the splitting property is hardly given.

In addition, the alkaline solution treatment simultaneously removes the incompatible organic substance on the surface of the side yarn fibers, and produces streak-like grooves along the fiber axis direction, so that a dry feeling is obtained. Further, fibrils can be generated on the surface of the side yarn fibers by rubbing the surface of the composite false twisted yarn during the treatment with the alkaline solution or before or after the treatment. The alkaline solution treatment may be performed on the composite false-twisted yarn or after it is woven or knitted, but the processability is better after it is woven or knitted.

Next, the method for producing the splittable false false twisted 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 different elongations are combined and false-twisted or drawn false-twisted, polyester and the polyester are used as the yarns on the high elongation side. A polyester multifilament yarn composed of a polyester composition composed of an incompatible organic substance is used.

As the incompatible organic substance, the organic substance described in the embodiment of the composite false twisted yarn of the present invention is used. Further, it is necessary that the yarn on the high elongation side has a multilobe fiber cross section. The degree of irregularity of the multilobe cross section is preferably in the range of 2 to 4, and particularly 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, as shown in FIGS. 4A and 4B, the radius of the circle circumscribing the cross-sectional shape of the filament is r1, and the radius of the inscribed circle. Is defined as r1 / r2, which is the ratio of the radius of the circumscribed circle to the radius of the inscribed circle. The closer this value is to 1.0, the closer the cross-sectional shape is to a circle, and the larger this value, the sharper.

However, in the case where the cross-section has a circular hollow portion, the degree of irregularity is the circumscribed circle with respect to 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). Also, if the hollow part is not circular, and if there are two or more hollow parts, the radius of the hollow part with the circular hollow part having the same area as the total area of the hollow part at the center of the cross section is r3.

If the degree of irregularity is less than 2.0, the concentration of stress in the details of the filaments forming the side yarns is less likely to occur and the splitting property is insufficient, so that the object of the present invention cannot be achieved. If the degree of irregularity exceeds 4.0, the spinning process is unfavorably deteriorated.

When the number of protrusions is less than 2, the cross-sectional shape at this time is less likely to cause stress concentration on the joint root portion of the curve when pressure is applied even if the degree of deformation is 2.0 or more.
Since the splitting property is insufficient, the desired texture of the present invention cannot be obtained. On the other hand, when the number of protrusions is large, it is difficult to obtain a squeaky feeling, and therefore the number of protrusions in the multi-lobed shape is particularly 3 to
A range of 5 is preferred.

A method of imparting splitting properties to the composite false twisted yarn will be described with reference to FIG. 5 showing one embodiment of the above method. The thread (A) on the high elongation side, which is thick and thin,
The yarn (B) on the low elongation side is combined, mixed and entangled by the entanglement nozzle (2), and supplied to the false twist region via the supply roller (3). Here, in the composite yarn that is entangled with the mixed yarn, the high elongation side yarn is relatively moved to the outer layer part and the low elongation side yarn is relatively moved to the inner layer part by false twisting, and both yarns are It becomes a composite yarn having entanglement at the interface of the threads.

At this time, since the yarn on the high elongation side has a multi-lobe section (for example, FIG. 6A), in detail, twisting, compression, shearing, etc. of twist deformation at the joint root of each lobe Forces act intensively to cause internal strain or cracking that can be preferentially cleaved by alkaline solution treatment at the interface between the polyester matrix at the joint root of the multi-lobed section and the fine particles of the incompatible substance (for example, FIG. 6B). And
The state after the alkaline solution treatment is as shown in FIG.

Here, as the high elongation side yarn, a low-oriented undrawn yarn having a large thickness and a high-oriented undrawn yarn are used. On the other hand, as the yarns on the low elongation side, highly oriented undrawn yarns or drawn yarns are used.
The false twist is preferred because it can be drawn and twisted at a high speed using a friction false twist tool. The stretchable yarn has a speed of 2500 to 3500 m / min. So-called P spun in
OY, 4500 m / min. So-called U spun in the front and back
SY, spun and drawn yarns having an elongation of 50% or more.

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

Since the polyester obtained by copolymerizing the copolymerization component generally has a high heat shrinkage ratio, the heat shrinkage ratio of the composite false twisted yarn can be increased and a bulky woven or knitted product can be obtained.

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

[0043]

[Equation 1]

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

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

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

It is preferable to give entanglement to the composite false-twisted yarn from the viewpoints of improving the yarn processability and the handling property in the subsequent step, and for that purpose, it is preferable to give entanglement before and / or after false-twisting. Interlace nozzles and Taslan nozzles are suitable as interlacing tools. Interlace number is 40 to 120
The number / m is preferable.

[0048]

【Example】

[Example 1] A polyethylene terephthalate polymer to which 1.5 parts by weight of polyoxyethylene-based polyether was added was spun at a speed of 1100 m / min using a spinneret for a triangular cross-section as a high elongation side yarn, and a modified shape was obtained. Tri-lobal cross section of 2.9 degree, elongation of 310%, 170 denier, 3
Unstretched 6 filaments were obtained. This undrawn yarn was drawn at a draw ratio of 1.2 times at room temperature to give an elongation of 240%, 14
Thick semi-drawn yarn of 0 denier and 36 filaments was obtained.

On the other hand, a polyethylene terephthalate polymer in which 12 mol% of isophthalic acid was copolymerized was spun at a speed of 3300 m / min as the low elongation side raw yarn to obtain an elongation of 11
A highly oriented undrawn yarn of 5%, 125 denier, 12 filaments was obtained.

These two yarns were aligned and processed in the process shown in FIG. Entangling was performed using an interlaced nozzle under the conditions of a pneumatic pressure of 2 kg / cm ² and an overfeed rate of 2%, followed by a heater temperature of 130 ° C. and a stretching ratio of 1.
6 times, surface speed of circumscribed friction false twist disc 600
m / min. , Processing speed 300 m / min. Composite false twisting was performed in.

In the obtained false-twisted composite yarn, the yarn on the low elongation side serves as the core, the yarn on the high elongation side serves as the side yarns, and is entangled at the interface between the core yarn and the side yarns. It was a structure having. The characteristics of the yarn are that the yarn length difference between the core yarn and the side yarn is 16%, and the crimp ratio is 5.5.
%, Boiling water shrinkage 9%, strength 2.8 g / de, elongation 20
%, The number of entanglements was 50 / m, and the tri-lobal cross section of the side yarn had undergone false twist deformation.

Next, 1300 T was added to the obtained composite false twisted yarn.
/ M additional twisting and weaving with a 2/2 twill design, relaxing (100 ° C, 25 minutes treatment), preset (180 ° C,
45 seconds treatment), alkali weight loss (NaOH 35g / l solution, 97 ° C treatment, weight loss 23%), dyeing (130 ° C, 4
5 minutes) and a final set (160 ° C., 45 seconds treatment) were performed to finish the woven fabric.

On the surface of the finished woven fabric, details of the side yarns of the composite false-twisted yarn were found at the root portion of the lobe joint, where splits and streaky micropores were observed, and there were also fibrillated portions, giving a strong squeaky feeling. The soft touch of fibrils was also added to a certain texture, and as a result, it was a spun rayon fabric with a strong squeaky texture. In addition, almost no splitting was observed in the thick part of the side thread, and although it was a twill weave of sweet twist, both snag and pilling were grade 4.5 (grade 5 was the best grade and grade 3.5 or higher was acceptable). ) Was obtained, and a woven fabric having improved snugging and pilling, which was sufficiently durable for practical use, was obtained.

[0054]

In the composite false-twisted yarn of the present invention, the side yarn filament has a multi-lobe cross section and has a large and thin in the lengthwise direction, and due to the false-twist distortion in the details, the splitting property at the joint root of each lobe By the treatment with an alkaline solution, at least a part of the lobes of the multi-lobe is split at the joint root portion to form an irregularly 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 polyester matrix in the form of particles, the alkaline solution treatment forms elongated grooves along the filament axial direction on the filament surface, and a dry feeling is also added. It Furthermore, during the treatment with an alkaline solution or before or after the treatment, the surface of the composite false-twisted yarn may be rubbed to generate fibrils on the surface of the side yarn filaments to add a fibril feel.

According to the method for producing a composite false twisted yarn of the present invention,
The splitting property due to false twist strain can be imparted to each lobe joint root portion 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 strain does not concentrate at the joint root of each lobe in the thick part and has almost no splitting property, so even if it is treated with an alkaline solution, splitting occurs. Instead, it can prevent and improve the propagation of snags and pillings.

[Brief description of drawings]

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

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

FIG. 3 is a perspective view exemplifying a splitting state that develops at a lobe-bonded root of a side yarn fiber when the composite false-twisted yarn of the present invention is treated with an alkaline solution.

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

FIG. 5 is a diagram showing a manufacturing process of the composite false twisted yarn of the present invention.

FIG. 6 is a perspective view exemplifying how the side yarn multi-lobe fiber cross section of the composite false-twisted yarn of the present invention changes from the original yarn (a) to after the composite false-twisted (b).

[Explanation of symbols]

A: High elongation yarn B: Raw yarn on the low elongation side 1 ... Supply roller 2 ... Entanglement nozzle 3 ... Supply roller 4 ... heater 5 ... Friction false twisting device 6 ... take-off roller 7 ... Winding device S: Side yarn of composite false twisted yarn C: Composite false twist core yarn R: Split surface of multi-lobe filament

Continuation of the front page (56) Reference JP-A-7-157930 (JP, A) JP-A-6-73629 (JP, A) JP-A-54-77746 (JP, A) JP-A-4-361609 (JP , A) Patent 3236221 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) D02G 1/00-3/48 D02J 1/00-13/00

Claims (2)

(57) [Claims] 1. A composite false twisted yarn comprising a core yarn and a side yarn entwined around the core yarn, wherein the side yarn is a polyester composition comprising polyester and an organic compound incompatible with the polyester. It is a filament yarn that is composed of a material and is thin in the length direction and has a multi-lobe cross section, and the joint root part of each lobe in detail is given selective splitting property by false twist strain. Splittable composite false twisted yarn. 2. In a method for producing a composite false-twist 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 is used as a yarn on the high elongation side. And a polyester composition comprising the polyester and an incompatible organic compound, the polyester multifilament yarn having a multi-lobed fiber cross section in the cross-sectional direction and a large and thin cross section in the length direction. A method for producing a splittable false false-twisted yarn, which comprises: