JPH07324243A - Combined falsely twisted fused yarn and its production - Google Patents

Abstract

PURPOSE:To obtain combined falsely twisted fused yarn having no characteristic tough feeding of fused yarn and no visual unevenness, showing tension, stiffness and a feeding of thghtness due to collecting properties as the whole yarn, having torque and crimp due to false twist processing, capable of providing woven fabric with expression such as crepe, etc. CONSTITUTION:In combined falsely twisted fused yarn comprising combined multifilament yarn in which plural kinds of filament yarns having different melting points are mutually fused in the longer direction, the characteristic of this combined falsely twisted fused yarn is that filament yarn 2 having the lowest melting point in the combined multifilament yarn is at least fused to form a fused part, the fused part amounts to 5-30% of the cross section of the combined multifilament yarn and covers >=90% of the surface area of the side of the combined multifilament yarn and the filament yarn having the lowest melting point has higher solubility than the other filament yarns. A method for producing the combined falsely twisted fused yarn is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a false twist composite fused yarn and a method for producing the same. More specifically, when it is made into a woven fabric, there is no coarse and hard feeling peculiar to the fusion splicing yarn, and a unique tightness feeling,
The present invention relates to a false twist composite fusing yarn capable of imparting a rich expression to a texture and an excellent texture such as softness and elasticity, and a manufacturing method thereof.

[0002]

BACKGROUND OF THE INVENTION Synthetic fiber filament woven and knitted fabrics
Various studies have been conducted to add texture, facial expression such as softness, firmness and elasticity. Among them, the alternating twist fusion-bonded yarn is well known as one utilizing fusion. Further, in recent years, in order to reduce the feeling of coarseness and hardness peculiar to the fused yarn, the fused portion is partially untwisted by squeezing it or crushing it with a pressure roller (JP-A-54-38957).
Alternatively, the fused portion of the alternating twist fusion yarn composed of the composite fiber is eluted after forming the fabric (Japanese Patent Publication No. 63-75128).
and so on.

However, the yarns obtained by these conventional methods have a twist structure in which the untwisted portions and the untwisted portions are alternately arranged in any of the methods, so that the visual unevenness in the yarn length direction is caused. Was inevitable. Further, the torque that contributes to the wrinkle rise is also the reversal torque of the untwisted portion or the untwisted torque of the untwisted portion, and the parts and strength at which it occurs are also nonuniform.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of such alternating twist fusion-bonded yarns, and to have no fusion-bonded portion after weaving and post-processing, and thus to provide a coarse texture peculiar to the fusion-bonded yarns. There is no hardness, there is no unevenness visually, and because the yarn as a whole maintains the convergence, it has a firmness, elasticity, tightness, and since it is false twisted, it has a torque. Another object of the present invention is to provide a false twist composite fusible yarn having crimp and capable of giving a texture such as a texture to a woven fabric, and a method for producing the same.

[0005]

Means for Solving the Problems The false twist composite fused yarn of the present invention for this purpose is a provisional multifilament yarn in which plural kinds of filament yarns having different melting points are fused to each other in the longitudinal direction of the yarn. In the twisted composite fused yarn, at least the filament yarn having the lowest melting point among the composite multifilament yarns is fused to form a fused portion, and the fused portion is 5 times the cross-sectional area of the composite multifilament yarn. Occupying up to 30%, covering 90% or more of the side surface area of the composite multifilament yarn, and the filament yarn having the minimum melting point is more soluble than other filament yarns. It consists of things.

The method for producing false twist composite fused yarn according to the present invention comprises a sea component which is insoluble in cold water and soluble in hot water, and an island component which has a melting point higher than that of the sea component and is insoluble in hot water. The sea-island composite fiber is subjected to fusion false twisting, and then the sea component is dissolved and removed with hot water.

Here, 5% of 8 to 15 mol% as a sea component
-Sodium sulfoisophthalic acid and 5-40 mol%
It is preferable that the remaining acid component is mainly composed of terephthalic acid and is composed of a copolyester. As the island component, polyethylene terephthalate is particularly preferable. It is preferable that such a sea-island type multi-component composite fiber is subjected to fusion false twisting with a monofilament.

What is most important in the false twist composite fused yarn of the present invention is that the lowest melting point component is fused and the yarn cross section is kept circular without forming alternate twists. Generally, the elasticity and elasticity of filament woven and knitted fabrics are said to be mainly due to the bending rigidity of a single yarn alone, the bending rigidity of the entire yarn, the friction between the yarns of the woven and knitted fabric, and the binding force.
Specifically, things that are said to have elasticity and elasticity,
"The cross section of the single yarn is large", "Young's modulus of the single yarn is high",
It has yarn or fabric characteristics such as "the yarns converge and the friction between the single yarns and between the yarns is large", and "the weaving density is high".

For this reason, in the processing of composite yarns, thick denier yarns are used as core yarns, twisted yarns are applied to the entire yarn to impart roundness and convergence, and the mirror surface and unevenness are large in order to increase the friction of the yarn surface. Various ideas and studies have been made such as using threads.

However, in these methods, for example, in the case of composite yarn processing, it is necessary to supply a plurality of yarns, which leads to an increase in cost and the apparatus becomes complicated. Also,
Applying the twisted yarn significantly impairs the productivity, and this also has a drawback that the cost is increased.

One of the objects of the present invention is to improve the roundness and convergence of the yarn that contributes to firmness and elasticity. When the composite fiber containing the low-melting point component used in the present invention is temporarily twisted, if the temporary twisting temperature is equal to or higher than the softening point of the low-melting point component, preferably higher than the melting point, it is twisted in the twisting portion and accompanied by softening and melting of the low-melting point component. Flow occurs, and as a result, twist stress concentrates on the other component having rigidity, and the low-melting point component is squeezed out to be located in the outer layer of the fusion-bonded yarn.

Therefore, in the obtained yarn, as shown in FIG. 1 to be described later, the other component 1 (high melting point component) converges on the center of the yarn, and the low melting point component 2 fused around it is covered, and The entire yarn will be rounded as if it were a twisted yarn.

After the yarn thus obtained is knitted or woven, if the fused low melting point component of the outer yarn layer is removed, voids are formed around the yarn and the outer single yarn will swell to fill the voids. Therefore, the inner layer can have a relatively dense structure and the outer layer can be sparse. Therefore, while having elasticity and elasticity, the bending stress at the beginning of the fabric bending is small, that is, it can be made to have no hardness. it can.

However, in the case of a normal composite fiber yarn having no structure as in the present invention, that is, a composite fiber yarn in which a removing component is relatively uniformly interposed between single yarns composed of insoluble components, By removing the component interposed between the single yarn and the single yarn, the degree of freedom of the single yarn increases, and as a result, the convergence cannot be maintained, the yarn becomes flat, and the texture of the fabric becomes soft. It's just a crappy thing.

Further, as for the torque, since the phases of the individual yarns are relatively aligned, it is apparently expressed as the entire yarn, and the effect of the torque can be utilized more effectively.

Still another object of the present invention is that, as described above, since the fused portion substantially covers the entire surface of the yarn, partial torque concentration and crimping are exhibited before forming the fabric. Therefore, it is excellent in untwisting property, fluff-free property, unwinding property, and knitting and weaving property. In order to achieve the above object, it is important that the fusion-bonded portion of the conjugate fiber covers almost the entire surface of the yarn with the fusion-bonded yarn of the composite fiber composed of components having different melting points as in the present invention. Furthermore, it is important that the low melting point component forming the fused part dissolves or decomposes at a lower temperature and higher speed than other components in order to maintain torque and crimp, and also to maintain convergence. Is. That is, it is important that the low melting point component has a higher solubility than the high melting point component.

The spinning method and the cross-sectional shape of the conjugate fiber used in the present invention are not particularly limited,
In terms of having a variety of torques and crimps by regulating the position of single yarn during false twisting (migration regulation), a 1-filament multi-filament type, in which a single-filament composite fiber is divided into multiple single yarns by post-processing A yarn type composite fiber, more specifically, a sea-island type composite fiber (A) as shown in FIG.
Mixed spinning type composite fiber (B), separation split type composite fiber (C)
Is preferred. Among them, the sea-island type composite fiber is more preferable.

The function of the low-melting point component in the present invention is made latent by including the torque and crimp obtained by false twisting, and also has the property of being soluble and / or easily decomposable or both, and is easily removed. Of nature.

A more important function is to regulate the exchange (migration) of the single yarns during false twisting, thereby imparting a torque / crimp difference between the single yarns.
Conventionally, proposals have been made for fusion-bonding alternate twisted yarns of multicomponent conjugate fibers, but since migration of single yarns occurs before the heater, that is, before fusion, the obtained crimps are uniform between single yarns. Has become.

However, if the 1-filament multi-single-thread sea-island composite fiber recommended in the present invention is used, at least 1
Migration between single yarns in the filament cannot occur, so crimping morphology and difference in inner and outer layers of torque can be given between the single yarns, which gives the fabric a subtle swelling and rich expression. You can In particular, what is obtained by subjecting the monofilament of the sea-island type composite fiber to the fusion false-twisting process is preferable from the viewpoint that migration between single yarns does not occur.

The cross section of the yarn which is false-twisted and fused by using such a composite fiber is shown in FIG. Reference numeral 1 is a high melting point component such as polyester, and 2 is a fused minimum melting point component. When the minimum melting point component in the present invention is removed, it may be one which is dissolved independently of other components, or one which is decomposed, or when the rate thereof is extremely high. Furthermore, the melting point is preferably 200 ° C. or lower because it is mainly used together with polyester and polyamide. The composition of the copolymerized polyester containing 8 to 15 mol% of 5-sodium sulfoisophthalic acid and 5 to 40 mol% of isophthalic acid, the main acid component of which is terephthalic acid, is insoluble in cold water and is hot water. Are more soluble and have a lower melting point than fibers usually used for clothing, and are therefore more preferable. It is preferable that the melting point of the filament yarn having the lowest melting point is lower than the melting points of other filament yarns by 10 ° C. or more.

The ratio of the lowest melting point component to the yarn cross-sectional area is in the range of 5 to 30%. If it is less than 5%, the single yarns cannot be sufficiently fused with each other, and if it is more than 30%, not only the desired texture cannot be obtained because the weight reduction effect when the fabric is made is too large, Increasing the ratio of the low-melting-point component, which is a high-cost polymer, causes an increase in cost, which is not preferable. It is especially important that the lowest melting point component, which is a fusion component, covers 90% or more of the surface area of the yarn and is fused over the entire yarn length. The rigidity of the fused portion causes the torque of the entire yarn to be increased. It dynamically suppresses the occurrence of crimps. If there is a part that is not covered, the morphological unevenness of the yarn will occur there and it will become a dirty streak on the woven or knitted fabric, or it will cause chattering due to the concentration of torque.
It is not preferable because it causes a problem in the passability in the weaving process.

Further, in the present invention, by selecting a polymer which is insoluble in cold water and soluble in hot water as the low-melting point component, the low-melting point component can be removed at a relatively low temperature at which torque and crimping are less likely to occur. Not only can the effects of the above be more prominently obtained, but so-called weight loss effects can be obtained without using chemical products as in the past, and special safety protection equipment etc. are not required, and the working environment is significantly improved. It also has the advantage of

Further, since the low melting point component substantially covers the entire yarn, even a torque yarn or an ultrafine yarn can be woven without problems such as fluffing and fuzzing even if the sizing process and the setting process are omitted. be able to.

Further, in the false twist composite fused yarn according to the present invention, the expansion recovery rate after removing the fused components is 5% or more, the torque twist number is 20 T / m or more, and the single yarn length difference is 5 %
The above is preferable.

[0026]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. The yarn characteristics in this example are obtained by the following method.

(1) Expansion / contraction recovery ratio The expansion / contraction recovery ratio of the processed yarn was determined according to JIS-L1090.

(2) Torque twist number After removing soluble components of the processed yarn, both ends of the sample yarn sampled to a length of 1 m are fixed in the lateral direction and a load of 0.5 mg / d is hung at the center of the processed yarn. With both ends gradually approaching each other, when the both ends completely match, the number of twists is 50 cm
It was measured as the number of torque twists per unit, and was calculated by converting this per 1 m.

(3) Single yarn length difference After removing the soluble components of the processed yarn, the sample yarn sampled to a length of 20 cm was carefully disassembled into individual single yarns so as not to be stretched. The length of each single yarn was measured, and the difference in single yarn length was calculated by the following formula. Single yarn length difference (%) = (longest single yarn length-shortest single yarn length) / shortest single yarn length

Next, examples and comparative examples will be described. Tables 1 and 2 summarize these. The yarn was manufactured by the friction type temporary twisting device shown in FIG. [Example 1, Comparative Example 1] Low melting point component: terephthalic acid: 70 mol% isophthalic acid: 18 mol% 5-sodium sulfoisophthalic acid: 12 mol% Melting point: 210 ° C High melting point component: Polyethylene terephthalate melting point: 260 C. Composite ratio: (low melting point component / all components) = 0.2 Using the friction type temporary twisting device shown in FIG. 3, a processing speed of the drawn stretched yarn (150 denier, 27 filaments) of the sea-island type composite fiber having the above-mentioned configuration is 300 m / Min, temporary twist temperature 180
It was processed at ℃ to obtain false twist fused yarn. That is, the composite fiber yarn 3
Was pulled out by a supply roller (nip roller) R1, the low melting point component was fused by a heater H1, temporarily twisted by a false twisting unit T, and taken by a delivery roller R2 (nip roller). The yarn thus obtained had a low melting point component fused to cover the entire yarn and had a mild torque and no crimp. This yarn was used as a weft yarn and a polyester filament (150 denier, 54 filament) as a warp yarn, and was woven and then left in boiling water for 10 minutes to dissolve and remove the low melting point component. The resulting woven fabric has a soft and moderate bulge due to the slight crimping and torque developed after or at the same time as the removal of the low melting point component,
It had a tight feeling and had a rich and rich expression.

Comparative Example 1 is a yarn (30 denier, 12 filaments) obtained by spinning the low melting point component of Example 1 alone.
Similarly, a polyester filament (100 denier, 96 filament) spun alone is aligned and used as a supply yarn, which is a fusion yarn processed at a processing speed of 300 m / min and a temporary twist temperature of 180 ° C. It occupies 75% of the surface and the rest is not fused. Therefore, the fused portion and the non-fused portion have an alternating twist as seen in a normal fused alternate twist yarn, and in the woven fabric using the yarn, the low melting point component removed, the woven structure It was an uneven product, which was completely different from the famous product in which the alternating twists that were restrained by.

[Example 2, Comparative Examples 2 and 3] In Example 2, the low melting point component was the same as in Example 1, and the composite ratio was (low melting point component /
Processing speed of drawn yarn (150 denier, 27 filaments) of sea-island type composite fiber with all components = 0.07.
A false twist fusion-bonded yarn was obtained by processing at 0 m / min at a temporary twist temperature of 180 ° C. The yarn thus obtained was a non-crimped product having a low torque because the low melting point component was fused to cover the entire yarn and had a slight torque. This yarn was woven under the same conditions as in Example 1 and the low melting point component was removed. The obtained woven fabric had a swelling and tightness due to crimping and torque, and had a grainy and rich expression.

In Comparative Example 2, polyvinyl alcohol fibers (40 denier, 12 filaments) and ordinary polyester filaments (75 denier, 36) were used as low melting point components.
Filament) feed roller (feed roller)
The yarns aligned before (R1) were used as supply yarns and processed at a processing speed of 300 m / min and a temporary twist temperature of 230 ° C. to obtain false twist fused yarns. Since the obtained yarn had a small melting point difference between the low melting point component and the high melting point component polyethylene terephthalate, sufficient fusion could not be obtained, and the yarn had an alternating twist which causes unevenness.

In Comparative Example 3, a polyethylene terephthalate drawn yarn (150 denier, 72 filaments) was used to carry out fusion false twisting at a processing speed of 300 m / min and a temporary twist temperature of 230 ° C. The woven fabric obtained by the same method as in Example 1 had rough texture and unevenness due to alternate twisting. Furthermore, the fused portion had a hard and hard texture.

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

EFFECTS OF THE INVENTION According to the false twist composite fused yarn and the method for producing the same according to the present invention, a yarn having a slight crimp and having a yarn converging property is obtained by removing a low melting point component after forming a woven or knitted fabric. The shape of the fabric gives it a uniform, rich expression, and a moderate bulge, tightness, and firmness.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a false twist composite fused yarn of the present invention.

FIG. 2 is a cross-sectional view showing various aspects of the conjugate fiber used in the present invention.

FIG. 3 is a schematic configuration diagram of a false twisting device for obtaining a yarn according to the present invention.

[Explanation of symbols]

 1 High melting point component 2 Low melting point component 3 Composite fiber yarn R1 Supply roller H1 Heater T False twist unit R2 Delivery roller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location D06M 11/05

Claims (9)

[Claims] 1. A false twist composite fusion yarn comprising a plurality of types of filament yarns having different melting points fused to each other in the longitudinal direction of the yarn. The false twist composite fusion yarn has the lowest melting point among the composite multifilament yarns. The filament yarns are fused at least to form a fused portion, and the fused portion occupies 5 to 30% of the cross-sectional area of the composite multifilament yarn, and 90% of the side surface area of the composite multifilament yarn. A false twist composite fusible yarn, characterized in that it covers the above, and further that the filament yarn having the lowest melting point is more soluble than other filament yarns. 2. The false twist composite fusible yarn according to claim 1, wherein the melting point of the filament yarn having the lowest melting point is lower than the melting points of other filament yarns by 10 ° C. or more. 3. The filament yarn having the lowest melting point is hot-water soluble.
False-twisted composite fusion spliced yarn described in. 4. A copolymerization wherein the filament yarn having the lowest melting point contains at least 8 to 15 mol% 5-sodium sulfoisophthalic acid and 5 to 40 mol% isophthalic acid, and the remaining acid component is mainly terephthalic acid. The false twist composite fused yarn according to any one of claims 1 to 3, which is made of polyester. 5. The method according to claim 1, wherein after the fusion component is removed, the expansion and contraction recovery rate is 5% or more, the torque twist number is 20 T / m or more, and the single yarn length difference is 5% or more. Through 4
6. A false twist composite fused yarn according to any one of 1. 6. A sea-island type composite fiber composed of a sea component that is insoluble in cold water and soluble in hot water and an island component that has a melting point higher than that of the sea component and is insoluble in hot water, and is subjected to fusion false twisting, A method for producing a false twist composite fused yarn, which comprises dissolving and removing sea components with hot water. 7. A copolymerized polyester containing 8 to 15 mol% of 5-sodium sulfoisophthalic acid and 5 to 40 mol% of isophthalic acid as a sea component, and the remaining acid component is mainly terephthalic acid. 7. The method for producing a false twist composite fused yarn according to claim 6. 8. The method for producing a false twist composite fused yarn according to claim 6 or 7, wherein the island component is polyethylene terephthalate. 9. The method for producing a false twist composite fused yarn according to claim 6, wherein the sea-island type multi-component composite fiber is fused and false twisted with a monofilament.