JPH06346336A - Conjugate fluffed yarn and its production - Google Patents

Abstract

PURPOSE:To obtain a conjugate fluffed yarn having uniform string line in longitudinal direction, much fluffs and sags and high retention of the yarn strength, elongation or the initial tensile modulus and exhibiting spun-like feeling with excellent crispness and stiffness and provide its production process. CONSTITUTION:This conjugate fluffed yarn is a multifilament yarn composed of a core yarn and a sheath yarn. The surface of the multifilament yarn gas protrusions such as fluffs and sags and the protrusions are confines to the yarn surface owing to the participation of the protrusion in the mutual entanglement of the filaments constituting the core yarn and the sheath yarn. All of the fluffs and sags of the protrusions are composed of the sheath yarn. This invention also relates to a process for the production of the yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite fluff yarn having a texture of spun-like filament having a uniform yarn reinforce and a large retention ratio of yarn tenacity / elongation and initial tensile resistance value. A composite fluff yarn suitable for applications such as lady's and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, spun yarn has the bulkiness, warmth,
Many attempts have been proposed to achieve softness and the like by using a fluff yarn in which fluff is added to a multifilament yarn.

For example, there is a method of temporarily twisting a multifilament yarn while rubbing it with a blade. In this method, the abrasion material causes abrasion over time, and thus the quality of the fluff yarn gradually changes. In other words, the number of fluffs changes in the longitudinal direction of the yarn to cause unevenness of the fluff, which causes a drawback that tensile properties such as tenacity, elongation or Young's modulus of the yarn vary. As another method, there is a method in which a multifilament yarn, which is heat-treated and intermittently weakened or partially cut along the longitudinal direction of the yarn, is temporarily twisted and then entangled.
This method has a drawback in that the fluff of the obtained fluff yarn is imparted with a twist, and a long fluffy leg has the drawback that the fluff entangles with each other or causes pilling.

Further, as described in Japanese Patent Laid-Open No. 1-272840, there is a method in which multifilament yarns are rubbed with each other to cut a single fiber filament yarn into a fluff yarn. This is because when the number of fluffs is increased, the tenacity / elongation of the fluff yarn and the tensile properties such as the initial tensile resistance value are adversely decreased, so the texture such as "tension" and "waist" is greatly reduced.
The drawback was that it became a "wobbled" product.

Further, in order to improve the tenacity / elongation of the yarn and the initial tensile resistance value, a monofilament filament yarn having a large fineness is mixed in the multifilament yarn as described in JP-A-2-91236. Delicate fluff yarn has been proposed. However, the filament yarn having a large fineness is partially cut, so that the strength / elongation of the yarn and the initial tensile resistance value cannot be significantly improved.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide uniform yarn streaks in the longitudinal direction of the yarn.
It is an object of the present invention to provide a composite fluff yarn having a high tenacity / elongation of the fluff yarn, a high retention rate of the initial tensile resistance value, and a spanlike feeling which is excellent in "tension" and "waist" of the product, and a method for producing the same. .

[0007]

The present invention for achieving the above object has the following constitution.

That is, in a multi-filament yarn consisting of a core yarn and a sheath yarn, fluff and slack protruding yarn portions are provided on the surface of the multi-filament yarn yarn, and the protruding yarn portions are the core yarn and the sheath yarn. The composite fluff yarn is characterized in that the filament yarn is constrained on the yarn surface by being entangled with each other, and that the fluff and slack of the protruding yarn portion are all made of sheath yarn.

Further, the multifilament yarn to be the sheath yarn is previously subjected to the fluid entanglement treatment, and then the yarn is wound around the guide, and both the yarn on the outward path toward the guide and the yarn on the return path toward the guide are tensioned. Twisting and handling are given to both reciprocating yarns by intersecting each other, and then the multifilament yarns that become the sheath yarns and the multifilament yarns that become the core yarns are aligned and subjected to fluid entanglement treatment. And a method for producing a composite fluff yarn.

The requirements for forming the composite fluff yarn of the present invention will be described in detail below. First, there is no particular limitation on the material and variety of the sheath yarn that forms protruding yarn portions such as fluff and slack on the surface of the multifilament yarn. A synthetic fiber filament yarn such as polyester filament or nylon or a semi-synthetic fiber such as acetate or rayon can be used, but a material having a high elastic modulus is preferable. Further, the filament yarn serving as the sheath yarn may be a raw yarn, a temporary twist yarn, or a bulk high yarn such as an air-processed yarn. With raw silk, filament-like yarn can be obtained, and with high-powder yarn, composite fluff yarn with span-like texture can be obtained.

As the yarn type, when the number of single fiber filaments becomes large or becomes thin, a material having a softer spun-like texture or peach-touch texture can be obtained. When a yarn having a modified cross-section is used, particularly when the yarn has a triangular cross-section, a dry, spun-like touch is obtained. Further, not only fully drawn yarns but also incompletely drawn yarns, thick and thin yarns, etc. can be drawn or used as they are.

On the other hand, with respect to the core yarn, in the fluff processing (interlacing treatment) of the composite fluff yarn of the present invention, since it is not substantially subjected to interlacing, twisting or handling, there is substantially no fluff or sagging. There is no particular limitation on the material of the yarn to be used and the yarn type, and the yarn characteristics of the raw yarn can be utilized as they are in the composite fluff yarn of the present invention.

That is, since the conventional composite processed yarn having fluff was obtained by performing fluffing after composite mixing, in order to prevent the core yarn from being easily cut during the fluffing, the core is inevitably cut. The yarn was subject to the constraint that a yarn with a fineness considerably larger than that of the sheath yarn had to be used (however, a part of the core yarn was also cut by fluffing). On the other hand, in the composite fluff yarn of the present invention, since the fluffed yarn is used only for the sheath yarn, since the core yarn is not cut, the strength of the composite fluff yarn does not decrease.

Therefore, in the composite fluff yarn of the present invention, the single yarn fineness of the core yarn is not restricted, and in particular, the composite fluff yarn composed of a yarn having a relatively small single yarn fineness of 0.1 denier or more and 2 denier or less. If so, there is no problem of strength reduction and the effect of the present invention is great. However, if the fineness of the core yarn becomes too small, the composite processed yarn loses its elasticity, so
The fineness of the core yarn is preferably 1 denier or more and 5 denier or less. Further, it is preferable to use a sheath yarn having a single yarn fineness of 0.01 denier or more and 2 denier or less in order to impart a span-like feeling.

In the composite fluff yarn of the present invention, for example, the core yarn has a smaller number of monofilament filaments and a larger fineness than the sheath yarn, the fineness is large, the yarn cross-sectional shape is triangular, square, pentagonal, When the shape is octagonal, flattened, hollow, or the like, or when a combination of solvent-treated split fiber or denier mixed yarn is used, the "tension" and "waist" are increased and the drapeability is increased. This is a high and preferable usage. Bulky yarns such as raw yarns, temporary warp yarns, or not only fully drawn yarns but also incompletely drawn yarns and sick and thin yarns while being drawn or used as they are as core yarns Can be reasonably obtained. In addition, a combination of high-gloss yarns, high-transparency yarns, high-coloring yarns, latently crimped yarns, semi-synthetic fibers, etc., makes it possible to obtain a variety of composite fluff yarns.

The entanglement of the core yarn and the sheath yarn is entangled with each other by the entanglement process. Further, the filament of the protruding yarn portion such as the fluff or the slack of the sheath yarn is entangled with the filament of the core yarn, and the fluff and the slack are the yarns. It has a confounding structure constrained to the surface. It should be noted that some of the fluff and slack may be entangled between the monofilament filaments of the core yarn.

Next, the ratio of the core yarn and the sheath yarn in the unit yarn length of the composite fluff yarn is preferably such that the sheath yarn is longer than the core yarn. In other words, in other words, the larger the ratio of the real yarn length in the state where the sheath yarn is entangled with the core yarn, the more the yarn structure is wound, so the number of fluffs and slack in the unit yarn length of the composite fluff yarn increases. Brings excellent effect to spun-like texture. For that purpose, a highly shrinkable raw yarn is used as a core yarn. For example, in the case of polyester yarn, it is obtained by drawing at a glass transition temperature (Tg) or less of a copolymerized yarn with isophthalic acid or an incompletely drawn yarn. It is advisable to use a highly oriented low crystal yarn that can be used. However, a region where this ratio exceeds 20% is not preferable because the entanglement between the core yarn and the sheath yarn becomes weak.

Next, since the filament yarn of the core yarn is not subjected to the interlacing treatment of fluffing, the strength of the original yarn is particularly strong.
Since the elongation and initial tensile resistance do not decrease at all, it can be used while maintaining 100% as it is without impairing the characteristics of raw silk. Can be greatly improved.

FIG. 1 is a model diagram showing an example of the composite fluff yarn according to the present invention.

In the figure, 1 is a core yarn, 2 is a sheath yarn, and 3 is a fluff portion and a slack portion.

Next, an example for producing the composite fluff yarn of the present invention will be described.

FIG. 2 is a process schematic diagram showing an example of a method for producing a composite fluff yarn according to the present invention. The multifilament yarn 1 serving as the sheath yarn and the multifilament yarn 2 serving as the core yarn are supplied from the rollers 6 and 7, respectively, and the multifilament yarn 1 is pre-entangled by the air entanglement nozzle 8, and then the tension roller 9 and the delivery roller. The yarn-thread abrasion under high tension between 10 is fluffed by the fluff generation roller 11,
Then, the multifilament yarns 2 are aligned between the delivery roller 10 and the relaxing roller 12, post-entangled by the air entanglement nozzle 13, and wound up on the cheese 14.

That is, in the composite fluff yarn of the present invention, as described above, the multifilament yarn is preliminarily subjected to the air entanglement treatment,
The entangled yarn is wrapped around the guide, and the yarn on the outward path toward the guide and the yarn on the return path on the return side are twisted and interlaced with each other to give twists and pulls to both the reciprocating yarns. The fluff yarn that has been subjected to the interlacing treatment and the multifilament yarn that does not have the fluff can be manufactured by performing the air entanglement treatment again to form a composite.

In the production method of the present invention, prior to the interlacing treatment of the multifilament yarn to be the sheath yarn, the air entanglement treatment given in advance is very important for forming fluff and slack. By performing such a pre-entanglement treatment, the generation of neps and the length of the fluff foot due to the removal of the next interlacing treatment is adjusted, and the variation in the tenacity of the yarn is averaged and the tenacity and elongation are prevented and the fluff quality is reduced. It becomes possible to suppress the deterioration of.

Such a suppressing effect can be further improved by performing the air entanglement treatment again after the interlacing treatment.

Further, instead of the interlacing treatment, when the real twist is inserted as the first twist into the multi-filament yarn, the number of fluffs with extremely short fluffs is increased, and the composite fluff yarn with higher quality can be obtained. For example, for a 75 denier polyester filament yarn, 150 T / M or more is a preferable actual twist number.

In the present invention, the interlacing process is carried out by the yarns and the yarns while the multifilament yarns are running.
Make mutual threads constantly change over time. Therefore, the yarn quality does not change due to abrasion over time.

FIG. 3 shows an enlarged view of the fluff generating roller according to the present invention.

It is important that the thread-thread interlacing process is performed under tension. By twisting and pulling out the multifilament yarn by the crossing treatment under the tension, fluff and slack can be formed in a part of the filament filament yarn. The tension for applying this tension is preferably 0.5 g / d or more on the return path side.

In the present invention, the twist imparted by the crossing treatment is preferably at least 180 ° or more, more preferably 360 ° or more. The twist angle here will be described with reference to FIGS. If the position as shown in FIG. 4 is 0 °,
FIG. 5 is a view obtained by turning the surface shown by the diagonal line of FIG. 1 (which is one surface of the cylinder and is above the paper surface) 90 ° to the right, and the position as shown in FIG. is there. Turned 90 ° further from FIG. 5 and moved to 180 ° as shown in FIG.
And the position as shown in FIG.
It is 0 °, and the position as shown in FIG. 8 is 360 °.

In this way, by imparting a twist of 180 ° or more in the crossing treatment, it is possible to frictionally contact half or more of the outer circumference of the yarn with the other yarn, thereby cutting the filament single yarn in the longitudinal direction of the yarn. It can be randomized between single yarns. Therefore, the randomization of the cutting enables the thread streaks to be made more uniform.

The twist angle is preferably 360 ° to 720 °, and yarn breakage occurs in a range exceeding 720 °, which is not preferable.

Further, as described above, when the pretwist is inserted in the multifilament yarn before the crossing treatment, it is preferable that the twisting direction and the twisting direction of the crossing are the same. By making the twisting direction and the twisting direction the same, the number of generated fluffs can be increased and the fluff foot can be shortened. In the opposite direction, the number of fluffs is small and the thread line is not good.

Next, it is important to perform air entanglement again in order to make the multifilament yarn, which is a sheath yarn that is interlaced and fluffed, and the multifilament yarn, which is a core yarn having no fluff, into a composite. The entanglement process is performed while the multifilament yarn, which becomes the fluffed sheath yarn, is arranged so as to wrap around the multifilament yarn, which becomes the core yarn. In order to make the arrangement of the core yarn / sheath yarn larger, it is possible to make a difference in the supply amount of each multifilament yarn. That is, as shown in FIG. 2, the multi-filament yarn 2 is supplied from another roller so that the supply amount is equal to or smaller than that of the multi-filament yarn 1, and both yarns are post-entangled by the air-entanglement nozzle 13. .

For example, the supply amount of the sheath yarn is 100 m / min
In this case, it is preferable to set the core yarn supply amount to be equal to or less than 97 m / min.

Before and after the post-entanglement of both yarns by the air entanglement nozzle 13, heat treatment for tension or relaxation is performed to adjust the shrinkage ratio, impart a core / sheath yarn length difference, or shorten the fluff length. You can also do as.

[0037]

【Example】

Example 1 A yarn of polyester 50 denier 24 filament having a shrinkage rate of 19.3% which becomes a core thread, and a shrinkage rate which becomes a sheath thread.
2% polyester 60 denier 144 filament (single fiber filament denier 0.4d) was used to fabricate 120 denier 288 filament, and the sheath yarn was 4 kg / cm ² air pressure at + 2% overfeed rate.
Is carried out, and then the traveling speed is 400 m / mi
n, the forward side 53g, and the return side 145g are wound around the guide roller under high tension, and the forward side yarn and the backward side yarn are crossed with each other, thereby twisting and pulling out about 360 °. The fluffed sheath yarn and the core yarn were aligned at the same supply amount and reentangled by an entanglement nozzle at an overfeed rate of + 2% to obtain a composite fluff yarn.

The obtained composite fluff yarn had a sheath yarn having protruding yarn portions such as fluff, slack and loop on the surface, and a core yarn having no fluff at all was obtained.

The properties of the composite fluff yarn were as follows:

The boiling water shrinkage ratio, the initial tensile resistance value,
The fluctuation rate of strength, strength, and elongation were measured according to JIS method L-1073. The yarn length difference is expressed by the length ratio of the sheath yarn to the core yarn, which is obtained by performing a relaxing heat treatment in boiling water, separating the yarn into a core yarn and a sheath yarn, and measuring the respective lengths. For U spots, using a yarn unevenness tester manufactured by Zellbeger, a yarn speed of 25
It is the value measured by m / min and Normal Test. The fluff and slack were measured by using FRAY COUNTER MODEL-104 manufactured by Toray Industries, Inc. at a yarn speed of 60 m / min and a tension of 0.1 g / d.

Boiling water shrinkage rate (%) 15.6 Initial tensile resistance value (g / d) 75.4 Strength fluctuation rate (%) 6.4 Strength (g / d) 3.7 Elongation rate (%) 12 2.2 Yarn length difference (%) 6.8 U spots (%) 2.0 Fluffs and sagging (co / m) 0.35 mm or more from the front of the thread 234 0.88 mm or more from the front of the thread 91 Comparative Example 1 The same polyester filament yarns as in Example 1 were used, and the three yarns were aligned and simultaneously overfed ratio +
Entanglement treatment with air pressure 4kg / cm ² was performed at 2%, then traveling speed 400m / min, forward path 115g, return path 2
The yarn is wound around the guide roller under a high tension of 81 g, and the yarn on the outward path and the yarn on the return path are crossed with each other to give a twist and pullout of about 360 °, and then 4 kg again.
The composite fluff yarn was obtained by performing the entanglement treatment with the overfeed rate of + 2% by the entanglement nozzle of / cm ² .

Although the obtained fluff yarn had protruding yarn portions such as fluff, slack and loops on the surface, it was not a composite fluff yarn having a core-sheath yarn structure.

Shrinkage rate of boiling water (%) 13.8 Initial tensile resistance value (g / d) 68.3 Variation rate of strength (%) 9.3 Strength (g / d) 3.1 Elongation rate (%) 8 .5 yarn length difference (%) 4.8 U spots (%) 1.9 fluff, sag (ko / m) 0.35 mm or more from the front of the yarn 198 0.88 mm or more from the front of the yarn 69 Shrinkage with boiling water In the comparison by the rate, the present invention is higher by 1.8%, in the comparison by the initial tensile resistance value, the present invention is larger by 7.1 g / d, and the variation rate of the strength is smaller by 2.9%.

In comparison with the number of fluffs and the slack, when the present invention is 0.35 mm or more from the front of the yarn, it is 36 k / m, and when it is 0.85 mm or more from the front of the yarn, it is 22 k / m.

In the comparison of U spots by the yarn spot tester, the present invention has yarn characteristics such as 0.9 larger.

Example 2 A temporary twisted yarn of 24 filament 75 denier polyester having a stretch recovery rate of 35.2% to be the core yarn, and a 72 denier filament of 75 denier polyester to be the sheath yarn (single fiber filament denier 1.0 d) A fluff yarn was produced under the same conditions as in the production method of Example 1 using a bright gloss raw silk having a triangular cross section, and the sheath yarn of Example 1 was used while increasing the yarn supply amount by 2% from the core yarn. A composite fluff yarn was manufactured by treating under the same conditions as in the manufacturing method.

The obtained composite fluff yarn has sheath yarns having protruding yarns such as fluffs, slacks and loops on the surface, and the core yarns have no fluffs at all, and the fluffs are glossy composite fluff yarns. It was

Further, the sheath yarn of the composite fluff yarn has a protruding yarn portion having a gloss on the entire surface, and the core yarn has no fluff and a bulky stretchable composite fluff yarn is obtained. .

Expansion and contraction recovery rate (%) 8.8 Initial tensile resistance value (g / d) 62 Thread length difference (%) 2.1 U spots (%) 1.8 Fluffs, sagging (co / m) From the front of the thread 0.35 mm or more 138 0.85 mm or more from the front of the yarn 49 It is characteristic of the yarn that it is bulky while having elasticity and that the yarn having a triangular cross section of the sheath yarn has gloss.

[0050]

With regard to the texture, the composite fluff yarn of the present invention example has a larger number of fluffs, sagging, loops, etc. than the comparative example (conventional fluffed yarn), resulting in a span-like touch. It is characterized by a so-called filament-spun texture. This is because, when passing through the interlacing treatment, fluff, slack, loops and the like are formed only in the yarns of the sheath yarn, whereas in the comparative example, fluff, slackness also occurs in the sheath yarn and the core yarn,
The number of fluffs, slacks, and loops formed in the core yarn is reduced by the formation of loops and the like, and the number of fluffs, slacks, and loops formed in the sheath yarn is reduced, so that the total number is reduced. Therefore, the composite fluff yarn of the example of the present invention has a soft touch on the surface and a span-like feel. If the difference in yarn length between the core and the sheath becomes large, it becomes "bulge" or bulky and "warm"
And so on. In the composite fluff yarn of the example of the present invention, the core yarn is not subjected to any interlacing treatment, so that the shrinkage rate of the core yarn is 100.
%, It is possible to maximize the difference in yarn length. In the comparative example, a part of the core yarn is cut or a slack or a loop is formed, so that it is not possible to use a shrinkage ratio of 100%, so that the difference in yarn length is small.

The strength / elongation and initial tensile resistance of the inventive examples are higher than those of the comparative examples. As described above, since the core yarn is not affected by the decrease in the strength and elongation, the maintenance rate is high, and therefore, the "tension" and the "waist" are strong, and the texture is "clunky" like the comparative example. Not only that, it is possible to obtain a composite fluff yarn with a spun-like touch and excellent "tension" and "waist".

The variation rate of the initial tensile resistance value of the present invention is smaller than that of the comparative example by 2.9%, and the thread lines are uniform. This is also because the core yarn does not undergo any interlacing treatment, so that variations in yarn characteristics can be suppressed.

[Brief description of drawings]

FIG. 1 is a model diagram showing an example of a composite fluff yarn according to the present invention.

FIG. 2 is a process schematic diagram showing an example of a method for producing a composite fluff yarn according to the present invention.

FIG. 3 is an enlarged view of a fluff generation roller according to the present invention.

FIG. 4 is an explanatory view (showing 0 °) for explaining a twist angle in the present invention.

FIG. 5 illustrates a twist angle in the present invention (90 °
FIG.

FIG. 6 illustrates a twist angle in the present invention (180
FIG.

FIG. 7 illustrates a twist angle according to the present invention (270).
FIG.

FIG. 8 illustrates a twist angle according to the present invention (360).
FIG.

[Explanation of symbols]

 A: core yarn b: sheath yarn c: fluff part d: sag e: interlacing part 1: sheath filament multifilament yarn 2: core yarn multifilament yarn 6: supply roller 7: supply roller 8: air-entanglement nozzle 9: Tension roller 10: Delivery roller 11: Fuzz generating roller 12: Relaxing roller 13: Air entanglement nozzle 14: Cheese

Claims (3)

[Claims] 1. A multifilament yarn comprising a core yarn and a sheath yarn, wherein fluff is formed on the surface of the multifilament yarn.
The slack has a protruding thread portion, and the protruding thread portion is entangled in the entanglement of filaments forming the core thread and the sheath thread and is restrained on the yarn surface, and the fluff and slack of the protruding thread portion The composite fluff yarn is characterized in that all are composed of sheath yarns. 2. A multifilament yarn, which is a sheath yarn, is subjected to a fluid entanglement treatment in advance, and then the yarn is wound around a guide, and both the yarn on the forward path toward the guide and the yarn on the return path are tensioned. Twisting and handling are given to both reciprocating yarns by intersecting each other, and then the multifilament yarns that become the sheath yarns and the multifilament yarns that become the core yarns are aligned and subjected to fluid entanglement treatment. And a method for producing a composite fluff yarn. 3. The method for producing a composite fluff yarn according to claim 2, wherein the amount of core yarn supplied is aligned so as to be smaller than the amount of sheath yarn supplied, and the fluid entanglement treatment is performed.