JP2000234226A - Composite false-twist yarn and its production and woven/ knit fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composite false-twist yarn so designed that, among a plurality of filaments differing in dye selectivity from one another, the phases of the thick portions thereof are in dislocation from one another, thereby capable of giving woven/knit fabrics having unconventional multicolor effect, wild flow grain feeling, and soft and adequate puffy feeling. SOLUTION: This composite false-twist yarn comprises at least two kinds of thermoplastic synthetic fiber multifilaments 1, 2 differing in dye selectivity from each other; wherein each of the multifilaments 1, 2 is provided with 50-250/m interlaces, being a crimped one with axially uneven fineness, and the phases of the thick portions of the multifilaments 1, 2 are in dislocation from one another. It is preferable that the multifilaments 1, 2 are axially uneven in fineness with thick portions 3, 5-and-thin portions 4, 6, with a majority of the phases of such thick portions conformed with one another, and the multifilament structure has partially reversible fiber length difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heather-like composite false twist yarn suitable for use in clothing and industrial materials, and more particularly, the present invention has an unprecedented multicolor property and wild flow heather. The present invention relates to a composite false twist yarn, a method for producing the same, and a woven / knitted fabric using the composite false twist yarn.

[0002]

2. Description of the Related Art In a false twisted yarn obtained by performing a false twist processing on a cationic dye dyeable polyester yarn and a cationic dye non-dyeable polyester yarn and performing fluid treatment, the composition ratio of the false twist yarn, the number of filaments, or The entanglement form changes depending on the entanglement condition and the like, and accordingly, the sense of heat becomes different. However, in this case, in each case, only dichroism can be expressed, and when twisting is further performed, the heather becomes almost inconspicuous and the effect of the heather cannot be obtained. In addition, the heather formed by twisting is not only monotonous due to its structure, but it is also costly in view of productivity.

Therefore, a yarn incorporating polychromaticity has been proposed in, for example, JP-A-7-324237. According to this, the multicolor effect is a yarn obtained by false-twisting and entanglement processing a thick and thin yarn mixed with different fineness of a cationic dye-dyeable polyester and a non-stainable polyester to a cationic dye. And the different color effect is expressed by dyeing with a cationic dye. However, this method can only express up to three colors at best, including subtle hues.
Since the heather is a good heather like top dyed wool, it cannot express the wild multicolor flowing heather which is the aim of the present invention.

Further, a yarn in which the contrast is emphasized has been proposed in Japanese Patent Application Laid-Open No. 8-35137. According to this, the cationic dye-dyeable polyester yarn and the cationic dye-immiscible polyester yarn have thick details in the fiber axis direction, and the phase of the thick fineness portion of all yarns is uniform. In this way, the contrast of light and shade can be enhanced. However, in this method, when the cationic dye-dyeable polyester yarn and the cationic dye-immiscible polyester yarn are mixed at the time of spinning, the filaments of all yarns are easily mixed, so that the phase of the thick line portion is , It is not possible to express polychromaticity. Also, since the phase of the thick fineness part is uniform, the fineness difference is large in the part, so when performing false twisting, the fineness difference directly changes in tension, and as the yarn speed increases, the processability deteriorates and yarn breakage occurs. It is easy to occur frequently. For this reason, there is a problem that processing must be performed at a low speed.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a thermoplastic synthetic fiber multi-layer having different dyeing differences by giving all yarns a thickness unevenness in the fiber axis direction, and a different dye selectivity. The use of filament yarns allows for the introduction of unprecedented polychromaticity, and the production of multi-color, flowable, heat-resistant composite false twist yarns with soft and moderate swelling, and false twist processing. By doing in a series,
It is intended to provide a manufacturing method which is advantageous in cost.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and the composite false twist yarn of the present invention comprises at least two or more kinds of thermoplastic synthetic fiber multifilament yarns having different dye selectivities. The thermoplastic synthetic fiber multifilament yarn is entangled with a number of entanglements of 50 to 250 / m, and all yarns are crimped yarns having unevenness in the fiber axis direction. A composite false twist yarn characterized in that the phase of the thick portion is shifted between the respective yarns.

In the composite false twist yarn of the present invention, the thermoplastic synthetic fiber multifilament yarn has a thickness irregularity due to thick and thin in the fiber axis direction, and a thick portion between the filaments of each yarn. And the structure of the yarn has a partially reversible yarn length difference, contains 10 to 90% by weight of cationic dyeable yarn, and has a crimp rate of 10%. And the actual yarn length difference between the yarns is 3
% Or less, and twisting in the range of the following formula is applied to the composite false twist yarn described in any of the above.

K ≦ 22000 / D ^1/2 (where K represents the number of twisted yarns (t / m) and D represents the fineness (denier) of the composite false twisted yarn.) The method for producing a composite false twisted yarn of the present invention. Is stretched separately at least two or more thermoplastic synthetic fiber multi-filament highly oriented undrawn yarns having different dye selectivity at a temperature not higher than the glass transition point + 50 ° C. by a heating device, and then a draw ratio. It is characterized in that false twisting and interlacing blending are performed in a series of false twisting at 1.1 times or more.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The composite false twist yarn of the present invention comprises at least two or more kinds of thermoplastic synthetic fiber multifilament yarns having different dye selectivities. Along with the confounding of ~ 250 yarns / m, all yarns are crimped yarns having uneven thickness in the fiber axis direction, and the phase of the thick portion is shifted between the yarns. Composite false twisted yarn.

That is, first, at least two types of yarns having different dye selectivities may be used as a means for expressing the heather. For this purpose, in the present invention, a thermoplastic synthetic fiber multifilament yarn is used. For example, a nylon fiber yarn dyeable to an acid dye, a polyester fiber yarn dyeable to a disperse dye, or the like is used. The polyester includes a polyester dyeable with a cationic dye having a sulfonate isophthalic acid unit as a copolymer component. In the present invention, hereinafter, as the thermoplastic synthetic fiber multifilament yarn, a polyester fiber yarn that is dyeable with a cationic dye and a polyester fiber yarn that is unstainable with a cationic dye and dyeable with a disperse dye will be mainly described. Of course, the present invention is not limited to this.

[0011] These yarns are crimped yarns having uneven thickness in the fiber axis direction. There are several methods for imparting unevenness in thickness, but in consideration of imparting crimps by false twist, it is excellent to use thick and thin processing. The thick part of the thick-and-thin yarn has a low orientation, so that it is easy to adsorb the dye and is dyed dark. Conversely, since the thin portion has a high orientation, it is difficult to adsorb the dye, so that the thin portion becomes pale. In other words, a multicolored feeling of heat can be expressed by imparting thickness unevenness to all of the cationic dye-dyeable polyester fiber yarn and the cationic dye-immiscible polyester fiber yarn.

Thick and thin heathers are convenient for the present invention because they have relatively long shades and easy to express flowing heathers, depending on the processing conditions. Further, it is necessary that the phase of the thick portion is shifted between the respective yarns. The fact that the phase of the thick part is shifted means that the phase of the thick part is irregularly present between the respective yarns, and there is a part that rarely matches, but most of the thick part This means that the phases are different. As will be described later, by adopting such a structure, a feeling of swelling and an effect on the heather by the twisted yarn can be expected. Conversely, if the phases match, not only these effects cannot be obtained, but also the unevenness of the yarn is too large, which is not preferable because it lacks a soft feeling.

The ratio of the cationic dye dyeable (polyester) fiber yarn is 10 to 90%, more preferably 20 to 80%.
%. If the ratio of the cationic dye-dyeable fiber yarn is smaller than this, the cationic dye-dyeable yarn is hidden by the entangled blending, and it is difficult to obtain a polychromatic effect. vice versa,
If the ratio of the cationic dye-dyable fiber yarn is larger than this, the cationic dye-immiscible yarn is similarly hidden by the entangled fiber, so that it is difficult to obtain polychromaticity. In terms of processability, a large ratio of the cationic dye-dyeable fiber yarn is not preferable because fluff is likely to occur and the strength is greatly reduced as the ratio increases.

Next, the composite false twisted yarn of the present invention is crimped by false twisting to give a soft feeling and a swelling feeling. The crimp rate is desirably 10% or more, and more preferably 18% or more. If the crimping ratio is lower than this, the feeling of softness and swelling is poor, which is not preferable.

In the composite false twisted yarn of the present invention, a substantial yarn length difference between the yarns is preferably 3% or less. The substantial yarn length difference is a difference in the total length in the fiber axis direction between the cationic dye dyeable fiber yarn and the cationic dye non-dyeable fiber yarn. In the case of a core-sheath structure, a larger difference in yarn length is advantageous for giving a swelling feeling. However, the composite false twist yarn of the present invention has a sufficient swelling feeling despite the yarn length difference being substantially 3% or less. This is because all yarns have uneven thickness in the fiber axis direction, which causes voids and the phase of the thick portion of each yarn is out of phase. It is important that the phases be largely coincident.

The thick portion (thick portion) of each yarn is an incompletely stretched portion, has a lower orientation than the stretched portion, has a higher elongation, and conversely,
The details (thin portions) are completely stretched portions and highly oriented, and the portions have relatively low elongation. Therefore, the highly oriented thin portion is formed like a core yarn, and the low oriented thick portion is formed like a sheath yarn. Since it occurs in both the cationic dye-dyable fiber yarn and the cationic dye-immiscible fiber yarn, a partial core-sheath structure occurs between the yarns, and the portion where it is reversed in each part Since a random structure having a reversible yarn length difference is formed, a swelling feeling can be obtained.

The term "partially reversible yarn length difference" as used herein means that in the part where the thick part and the thin part are aligned in each yarn, the yarn on the thick part side is longer, and there is a yarn length difference in this part. ing.

Conversely, when the thick portion and the thin portion have opposite yarns, the opposite yarn becomes longer. In other words, this means that each portion has a yarn length difference, and the portion has a reversible yarn length difference such that the portion becomes a core yarn or a sheath yarn.

Next, the composite false twist yarn of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a model diagram for explaining thick and thin in the composite false twisted yarn of the present invention.
Is a model diagram of a yarn in which the phases of thick and thin are aligned between the yarns.

In FIG. 1, a cationic dye dyeable fiber yarn 1 is shown.
Is composed of a thick portion 3 and a thin portion 4, and the cationic dye-immiscible fiber yarn 2 is composed of a thick portion 5 and a thin portion 6. Between the filaments of the cationic dye-dyable fiber yarn 1 and the cationic dye-immiscible fiber yarn 2, the phases of the thick portions 3 or 5 are aligned, respectively. Since the phases of the thick part 3 and the thick part 5 are shifted between the two yarns of the cationic dye-immiscible fiber yarn 2, the cationic dye dyeable fiber yarn is viewed in the cross-sectional direction of the composite false twist yarn. A section in which the thick portion 3 of the yarn 1 and the thin portion 6 of the cationic dye-immiscible fiber yarn 2 are present; the thin portion 4 of the cationic dye-immiscible fiber yarn 1 and the cationic dye-immiscible fiber yarn 2 B section where the thick section 5 exists.

In FIG. 2, similarly to the case of FIG. 1, between the filaments of the cationic dye dyeable fiber yarn 1 and the cationic dye non-dyeable fiber yarn 2, the thick portion 3 or 5 is formed.
However, the phases of the thick part 3 and the thick part 5 are also uniform between the two yarns of the cationic dye-dyeable fiber yarn 1 and the cationic dye-immiscible fiber yarn 2, When viewed in the cross-sectional direction of the composite false twist yarn, the thick portion 3 of the cationic dye-dyeable fiber yarn 1 and the C portion where the thick portion 5 of the cationic dye-immiscible fiber yarn 2 exists, and the cationic dye dyeability It is composed of a portion D where the thin portion 4 of the fiber yarn 1 and the thin portion 6 of the cationic dye-immiscible fiber yarn 2 exist.

The composite false-twisted yarn of the present invention comprises most of the parts A and B
The polychromaticity can be expressed by the mixture of the part and the part C and part D. As shown in FIG. 2, it is obvious that the effect of the present invention cannot be obtained if a structure in which the phases of the thick portions match is adopted.

FIG. 3 is a model diagram for explaining the partially reversible yarn length difference of the composite false twist yarn of the present invention.

Since the thick portion having a high elongation is stretched by false twisting, the length of the thick portion is longer than that of the thin portion of the yarn having different dye selectivity. That is, a partial yarn length difference occurs between the thick portion 3 and the thin portion 6 and between the thin portion 4 and the thick portion 5. Referring to FIG. 1, in section A, the cationic dye-dyeable fiber yarn 1 becomes a sheath yarn and the cationic dye-immiscible fiber yarn 2 becomes a core yarn. Conversely, in section B, the cationic dye-immiscible fiber yarn 2 becomes a sheath yarn, and the cationic dye-dyeable fiber yarn 1 becomes a core yarn. The partial reversible yarn length difference is generated by the presence of the core yarn or the sheath yarn in the partial portion.

The yarn of the present invention does not require an extremely large difference in yarn length. Rather, there is a risk that the difference in yarn length may cause a nep due to a feeling of tingling or squeezing, or a heat sink abnormality due to yarn displacement. .

Next, the composite false twist yarn of the present invention has
It is necessary that confounding of ~ 250 pieces / m be given.
When the confounding is less than this, sizing is required during aging, which is not only costly, but also tends to cause poor shedding on the loom, resulting in a very poor high-order yarn. Conversely, if the confounding is more than this, the texture becomes hard, which is not preferable.

The number of confounds is derived from a value measured using an entanglement tester NPT-R2040 manufactured by ROTHSCHILD. The measurement method is as follows. The yarn is run at a running tension of denier of the yarn to be measured × 0.1 g / d, and a needle is stabbed from below to read the distance to the confounding point. At that time, set the trip level (confound point confirmation value) as shown in the following equation.

Denier of measuring yarn × 0.1 + (denier of measuring yarn)
This is measured 30 times, and an average value of half of the confounding distance is obtained. Double this distance to get the average number of confounding distances per meter, but here the length of the confounding points is very small and removed
The number of confounds is defined as the number of confounds. As described above, the composite false twisted yarn of the present invention is a multicolor flowing heat-treated composite false twisted yarn having a soft and swelling feeling, and is also a yarn excellent in cost and high passability.

The composite false-twisted yarn of the present invention can sufficiently express a multicolored heather even when used as it is for a woven or knitted fabric. However, by further twisting, the flowing heather can be further emphasized. Normal,
When twisting the heather yarn, the yarn becomes finer as the number of twisted yarns increases, and the effect of the heather becomes very weak. However, in the case of the composite false twisted yarn of the present invention, all yarns have thickness irregularities due to thick and thin, and the thick portions are out of phase. The thick part (dark colored part) hidden behind is exposed.

FIG. 4 is a model diagram when twisting is performed on the composite false twisted yarn of the present invention, (a) is a non-twisted model diagram obtained by further simplifying FIG. 1, and (b) is a model diagram. Is a model diagram when twisted at 400 T / M, and (c) is a model diagram when twisted at 800 T / M.
The outer side is covered by winding the thick part of each yarn around the thin part of the other yarn. In non-twist, the thick part is on the back side of the yarn or on the front side, so it is difficult to have a flowable mosaic, but the thick part hidden behind the yarn by twisting becomes a sheath yarn Because it comes out and wraps around it, a wild heather tone is obtained.

In the present invention, when the number of twisted yarns is further increased, the thick portion surrounds the outside of the yarn like a sheath yarn as shown in FIG. When dyed with, the part becomes a long deeply dyed part, so that the flowing heat can be further emphasized. The number of twisted yarns is preferably used in the range of the following formula.

K ≦ 22000 / D ^1/2 (where K represents the number of twisted yarns (t / m) and D represents the fineness (denier) of the composite false twisted yarn).

For example, about 1800 t for a 150 denier yarn
In the range of / m or less, a sufficient multicolor flow heat effect can be obtained.

However, if the phases are uniform, the number of twisted yarns increases, and the effect of the heat sink is reduced.

Next, a method for producing the composite false twisted yarn of the present invention will be described.

According to the present invention, two or more thermoplastic synthetic fiber multifilament highly oriented undrawn yarns having different dye selectivities are separately drawn by a heating device at a temperature of glass transition point + 50 ° C. or less, respectively. Next, a false twisting and entanglement blending process is performed in a series of false twisting at a draw ratio of 1.1 or more, which is a method for producing a composite false twisted yarn.

As described above, a polyester fiber yarn dyeable with a cationic dye and a polyester fiber yarn immiscible with a cationic dye and dyeable with a disperse dye will be described. The unstretched yarn of highly oriented polyethylene terephthalate dyeable to cationic dyes and the unstretched yarn of polyethylene terephthalate highly oriented to unstainable cationic dyes are separately drawn at a temperature of + 50 ° C or lower by glass heating point. It is to do.

The highly oriented unstretched polyethylene terephthalate yarn has a spinning speed of 2,000 to 4,500 m / min and a birefringence Δn of 0.015 to 0.080. In the present invention, since these are separately stretched, a stretching ratio suitable for each yarn quality can be selected, so that a wide variety of combinations are possible. However, if they are drawn in parallel, the processing conditions must be adjusted to the high spinning speed yarn, and if there is a spinning speed difference, the yarn length difference will occur, and the occurrence of nep due to flapping and ironing will occur. It is not preferable because of concern.

The stretching must be carried out at a temperature not higher than the glass transition point + 50 ° C. If the stretching temperature is higher than this, the heather is weakened, which is not preferable. Further, the drawing temperature may be different depending on each yarn.

Each of the drawn yarns is twisted at the false twist portion, but the twisting may be performed after the yarns are aligned using a roller before the false twist portion. The draw ratio of the stretch false twist processing is
1.1 times or more is preferable, more preferably 1.1 times or more, and 1.
3 times or less. If the draw ratio is lower than this, processing becomes unstable depending on the yarn speed, and undesirably, yarn breakage occurs frequently. If it exceeds 1.3 times, the thick part is elongated by stretching and the heather is weakened, which is not preferable.

The false twist device may be any of a pin type, a triaxial circumscribed friction type and a belt nip type, but a triaxial circumscribed friction type and a belt nip type capable of high-speed machining are preferable. In addition, it is necessary to impart confounding in order to converge the two yarns. Either before or after false twisting may be used for interlacing and blending. However, if interlacing and blending is performed before false twisting, the interlaced portion tends to come off due to subsequent stretch false twisting. It is preferable that the stretching ratio is set to a lower condition. Further, the nozzle used for the entanglement blending may be either of an air turbulence type such as an interlace nozzle or a Taslan nozzle. Further, a heat treatment heater may be used depending on the purpose of use.

Here, a method for producing a composite false twist yarn of the present invention will be described with reference to the drawings. FIGS. 5A to 5C are process diagrams each showing an example of the method for producing a composite false twist yarn of the present invention.

In FIG. 5 (a), the cationic dye-dyeable highly oriented undrawn yarn 7 is thickened and thinned between the feed rollers 9 and 10 using the hot pin 18. Similarly, the cationic dye-immiscible highly oriented undrawn yarn 8 is fed to the feed roller 1.
Thick and thin between 1 and 12 using the thermal pin 18. After the respective yarns are combined through the feed roller 13, the false twist heater 19, the false twist twister 21,
Between the delivery rollers 14, simultaneous stretching and false twisting is performed. Then, the entangled blending process is performed between the delivery roller 14 and the feed roller 15 using the entangled blending nozzle 22, and is wound by the winding roller 17 to obtain the processed yarn cheese 23.

FIGS. 5 (b) and 5 (c) show another example of the production method of the present invention. FIG. 5 (b) shows an example in which entanglement blending is performed before false twisting. (c) shows the case where a heat treatment heater was used after the false twisting process and the entanglement blending process. (b) and (c)
Is appropriately adopted in the present invention, and any method can achieve the object of the present invention.

[0046]

EXAMPLES Next, examples of the multicolor flowable yarn-like composite false twist yarn of the present invention will be described, but the present invention is not limited to these examples.

[Example 1] Polyethylene terephthalate highly oriented undrawn yarn 130 denier 24 dyeable to a cationic dye
Filament and polyethylene terephthalate highly oriented undrawn yarn 175 denier 48 filament, which is insoluble in cationic dye, are 1.55 times and 1.45 times respectively with a hot pin at a temperature of 90 ° C.
After being stretched twice, simultaneous triaxial stretching was performed to 1.20 times with a triaxial circumscribed friction false twist device, and then interlacing was applied at a processing pressure of 3.0 kg / cm2 using an interlace nozzle to obtain a composite temporary filament of 170 denier 72 filaments. A twisted yarn was obtained. This composite false twist yarn is 2
The phase of the thick part is shifted between the yarns of the species, resulting in a 15.2% partially reversible yarn length difference, 41% cationic dyeable yarn ratio, 2.5% yarn length difference, and crimp rate 20%, 120 confounds
Pcs / m. This composite false twist yarn is twisted at 400 T / M,
Weaving was performed at a weaving density of 120 × 85 with a weaving structure of 2/2 twill weave. Subsequently, a weight reduction process and a dyeing process with a cationic dye and a disperse dye were performed. The obtained woven fabric was a woven fabric having a multicolored wild flowing heather feeling and a soft and bulging feeling.

[Comparative Example 1] In the combination of the original yarns of Example 1, two kinds of yarns were first aligned and entangled at a working pressure of 3.0 kg / cm2 using an interlace nozzle.
The film was stretched 1.45 times with a hot pin at ℃. Thereafter, simultaneous false-twisting was performed at a draw ratio of 1.20 times using a triaxial circumscribed friction false-twisting apparatus to obtain a composite false-twisted yarn of 175 denier and 60 filaments. This composite false twisted yarn did not have a partially reversible yarn length difference because the phase of the thick portion was uniform between the two yarns. The ratio of cationic dyeable polyester fiber yarn is 43%, yarn length difference is 10.5%,
The crimp rate was 18% and the number of confounds was 90 pieces / m. This composite false twisted yarn was subjected to twisting, weaving, and dyeing and finishing in the same manner as in Example 1. The obtained woven fabric had a fine heather feeling of at most two or three colors, and had a lower contrast than that of Example 1. The texture was somewhat soft, though soft, with some nep-like yarns remaining.

[Example 2] In addition to the combination of the original yarns of Example 1, a polyethylene terephthalate high-flavoured drawn yarn 125 denier 18 filament, which is insoluble in cationic dyes, was drawn 1.50 times with a hot pin at a temperature of 90 ° C. After that, the yarn and the three yarns of Example 1 were simultaneously stretched and stretched to 1.20 times by a triaxial circumscribed friction false twist device, and then interlaced at a processing pressure of 4.0 kg / cm2 using an interlace nozzle, A composite false twist yarn of 240 denier 90 filaments was obtained. In this composite false twist yarn, the phase of the thick portion is shifted between the three yarn types, resulting in a partially reversible yarn length difference of 13.8%, a cationic dye dyeable yarn ratio of 29%, and a yarn length of 29%. 2.5% difference, 21% crimp rate, 120 confounds
Pcs / m. This composite false twist yarn is twisted at 400 T / M,
Weaving was performed at a weaving density of 105 × 78 with a weaving structure of 2/2 twill. Subsequently, a weight reduction process and a dyeing process with a cationic dye and a disperse dye were performed. The obtained woven fabric was a woven fabric having multicolored natural hues, a sense of flowing heat, moderate stiffness, softness and swelling.

Example 3 Polyethylene terephthalate highly oriented undrawn yarn 250 denier 30 dyeable to a cationic dye
After drawing the filament and the polyethylene terephthalate high-orientation undrawn yarn 60 denier 72 filament, which is immiscible with the cationic dye, with a hot pin at a temperature of 90 ° C., respectively, at a draw ratio of 1.50 times and 1.45 times, they are aligned and then using an interlace nozzle. At a processing pressure of 3.5 kg / cm2, confounding was applied.
A composite false twist yarn of 102 denier filaments was obtained. In this composite false twist yarn, the phase of the thick part is shifted between the two types of yarn,
As a result, the partially reversible yarn length difference was 12.9%, the ratio of cationic dyeable yarn was 80%, the yarn length difference was 1.0%, the crimping ratio was 18%, and the number of entanglements was 100 yarns / m. The composite false twisted yarn was knitted in a sheet-laying structure without twisting. Then weight loss processing, cationic dye,
Dyeing with a disperse dye was performed. The resulting knit is
Since the ratio of the cationic dyeable dye yarn was high, an elegant flow-like heather and an unprecedented multicolor effect in which cationic dye-undyed yarn was present were obtained. In addition, the texture was soft, a moderate swelling feeling and a dry feeling due to the cationic effect were obtained, and the knitted fabric was luxurious.

[0051]

According to the present invention, the dye selection system is different.
A composite false twist yarn having a partially reversible yarn length difference caused by a phase shift of a thick portion between two or more types of yarns. In addition, this composite false twisted yarn is untwisted or twisted to K ≤ 22000 / D1 / ² , and then used for warp or weft or both warp and weft to provide unprecedented polychromaticity. Thus, a woven or knitted fabric having a wild flowing heat feeling, a soft and sufficient swelling feeling can be obtained.

Further, by using the production method of the present invention, for example, at the time of uneven thickness provision processing, the yarns are separately drawn in accordance with the physical properties of the respective yarns, so that various combinations are possible. Further, it is very economical to perform the thickness unevenness imparting process, the entanglement blending process and the stretch false twisting process in a series of false twisting processes.

[Brief description of the drawings]

FIG. 1 is a model diagram for explaining thick and thin in a composite false twist yarn of the present invention.

FIG. 2 is a model diagram of a yarn in which the phases of thick and thin are aligned between the yarns.

FIG. 3 is a model diagram for explaining a partially reversible yarn length difference of the composite false twist yarn of the present invention.

FIG. 4 is a model diagram when twisting is performed on the composite false twisted yarn of the present invention.

FIGS. 5A to 5C are process diagrams each showing an example of a method for producing a composite false twisted yarn of the present invention.

[Explanation of symbols]

 1: Cationic dye dyeable fiber yarn 2: Cationic dye non-dyeable fiber yarn 3: Thick part 4: Thin part 5: Thick part 6: Thin part 7: Cationic dye dyeable highly oriented undrawn yarn 8: Cationic dye-immiscible highly oriented undrawn yarn 9: feed roller 10: feed roller 11: feed roller 12: feed roller 13: feed roller 14: delivery roller 15: feed roller 16: feed roller 17: winding roller 18: hot pin 19: False twist heater 20: Heat treatment heater 21: False twist twister 22: Entangled blended fiber nozzle 23: Processed yarn cheese

Claims (6)

[Claims] 1. A multifilament thermoplastic synthetic fiber yarn having at least two different dye selectivities,
The thermoplastic synthetic fiber multifilament yarn is provided with a confounding number of 50 to 250 / m, and all the yarns are crimped yarns having unevenness in the fiber axis direction,
A composite false twist yarn characterized in that the phase of the thick portion is shifted between the respective yarns. 2. The multifilament thermoplastic synthetic fiber yarn has a thickness unevenness due to thick and thin in the fiber axis direction, and most of the phases of the thick portion between the filaments of each yarn match. And a yarn structure having a partially reversible yarn length difference.
The composite false twist yarn according to the above. 3. A dye containing cationic dyeable yarn of 10 to 90% by weight, a crimp ratio of 10% or more, and a substantial difference in yarn length between yarns of 3% or less. The composite false twist yarn according to claim 2, wherein 4. A composite false twisted yarn obtained by twisting the composite false twist yarn according to claim 1 in the following formula. K ≦ 22000 / D ^1/2 (where K represents the number of twisted yarns (t / m) and D represents the fineness (denier) of the composite false twisted yarn) 5. At least two types of thermoplastic synthetic fiber multifilament highly oriented undrawn yarns having different dye selectivities are separately drawn by a heating device at a temperature not higher than the glass transition point + 50 ° C., A method for producing a composite false-twisted yarn, wherein false-twisting and interlacing blending are performed in a series of false-twisting at a draw ratio of 1.1 or more. 6. A woven or knitted fabric using the composite false twisted yarn or the composite false twisted yarn according to any one of claims 1 to 4 as a warp or a weft, or both a warp and a weft.