JP2621951B2 - Fluff thread - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a fluff yarn composed of a core / shear type multifilament yarn having a uniform yarn streak and a small fluctuation rate of strength, and more particularly to sports. The present invention relates to a fluff yarn preferably used for high-density woven fabrics having a soft spun-like feel, such as for fabrics or blousons.

[Prior Art] Conventionally, many attempts have been made to achieve the bulkiness of a spun yarn with a fluff yarn of a multifilament yarn.

As one of the methods, there is a method in which the multifilament yarn is false-twisted while being rubbed with a blade, or a method in which the multifilament yarn is false-twisted with a rough disk. But,
In this method, since the blade or the roughened surface disk wears over time, the yarn quality of the fluff gradually changes, and fuzz or uneven thickness is provided in the yarn longitudinal direction, so that the yarn streaks are not uniform, and the strength is high. However, there is a drawback that the variation rate is not constant in the yarn longitudinal direction and the variation rate is large.

As another method, there is a method in which a multifilament yarn in which a weak point or a portion is intermittently cut along a longitudinal direction of the yarn is false-twisted and then subjected to entanglement treatment. However, the fluff yarn obtained by this method has a drawback in that crimps are imparted to the fluff, and among them, those having a long fluff have poor fluff and tend to cause pilling.

As another known example, there is a method for producing a yarn from a film-like substance, as described in JP-B-43-14196. This is to make a fibrous body with narrow slits run frictionally under heating tension and fibrillate, but there is almost no entanglement of the fibrillated part, low strength, and a large fluctuation rate of strength. There were drawbacks.

[Problems to be Solved by the Invention] An object of the present invention is to solve the above-mentioned conventional drawbacks, to provide a uniform yarn streak in the yarn longitudinal direction, a small fluctuation rate of the strength, and a short fluffing foot. An object of the present invention is to provide a core / shear-type fluff that is less likely to cause pilling.

[Means for Solving the Problems] A fluff yarn of the present invention that achieves the above object has the following configuration.

That is, the single-filament filament denier of the sheath yarn is smaller than the core yarn and is 2.5 d or less, and the sheath / shear-type multifilament non-wound having a yarn length difference of 5% or more and 50% or less with respect to the core yarn. Fluff, slack,
It has a protruding yarn portion consisting of a loop, and the protruding yarn portion is entangled with the filaments of the core yarn and the sheath yarn and is constrained to the yarn surface, and 50% or more of the protruding yarn portion is a sheath yarn. A fluff yarn characterized by the following. Further, it is preferable that at least the sheath yarn is composed of a modified cross-section yarn.

If the requirements for forming the fluff yarn are described in detail, the multifilament yarn is not particularly limited, but at least a thermoplastic synthetic fiber multifilament yarn such as polyester or nylon is used. Further, the multifilament yarn may be either a raw yarn or a bulky yarn such as a false twist yarn. As the yarn quality, a filament having a large number of single fiber filaments, a thin shape and an irregular cross-sectional shape is suitable. Further, incompletely drawn yarn, thick and thin yarn, and the like can be used while being drawn.

In particular, the core yarn preferably has a higher contraction rate than the sheath yarn, and more preferably has a contraction difference of 10% or more between the core and the sheath. For that purpose, a high-shrink type raw yarn is used for the core yarn.For example, in the case of a polyester yarn, a highly oriented yarn obtained by drawing the copolymer yarn with isophthalic acid or the incompletely drawn yarn at a Tg temperature or lower. It is preferable to use a low-crystalline type thread or the like.

On the other hand, as for the Saya yarn, more than half the fluff and slack of the fluff yarn are composed of the Saya yarn, and the single fiber filament denier is thinner than the single fiber filament denier of the core yarn and less than 2.5 d. It is important that the distance is 1d or less. In addition, in order to take advantage of the characteristics of a higher glossiness and a soft spun-like feel, it is preferable that the yarn is a deformed cross-section yarn, particularly a triangle, a flat shape,
Pentagons, Y shapes, etc. are good.

Next, the difference in length between the core yarn and the sheath yarn is the ratio of the actual yarn length of the core yarn and the sheath yarn included per apparent single length of the fluff yarn, and It represents the ratio of the length of the sheath yarn to the length, which means that the sheath yarn is longer than 5%. When the yarn length difference becomes large, the surface of the fluff yarn is covered with a lot of fluff and slack of the sheath yarn, and the effect of the fluff yarn of the present invention can be remarkably expressed. On the other hand, a large difference in yarn length also means that the shrinkage of the core yarn is large, and the shrinkage of the fluff yarn itself is large, so that a high-density woven fabric can be obtained when used for a fabric.

However, when the yarn length difference exceeds 50% or more, the entanglement of the sheath yarn decreases in the yarn longitudinal direction, and "irritation" occurs in the woven fabric, or the woven fabric surface is disturbed, so that it is difficult to obtain a spun-like feeling.

Next, the entanglement of the core yarn and the sheath yarn is entangled with each other, the entire sheath yarn is entangled with the core yarn, and the fluff, slack, and loop protruding from the surface of the sheath yarn are formed on the surface of the fluff yarn. Is formed. More than 50% of the number of fluffs, slacks and loops protrude from the sheath yarn, and the spun like effect of the present invention increases as the ratio increases. Conversely, when the number of fluffs of the core yarn increases, the yarn strength decreases and the yarn unevenness increases, and it is difficult to handle as a fluff yarn.
By reducing the number of fluff of the core yarn and maintaining the yarn strength and increasing the number of fluff of the sheath yarn, the effect of the fluff yarn is remarkably exhibited, and that the core yarn and the sheath yarn are entangled with each other. This is a configuration point of the present invention.

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

In the figure, 1 is a core yarn, 2 is a sheath yarn, 3 is a fluff portion, 4
A slack portion and 5 indicate a loop portion, respectively.

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

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

The multifilament yarn Y ₁ and the multifilament yarn Y ₂ supplied from the respective rollers 6 and 7, a yarn under high tension between and above interlacing process by air entangling nozzle 8, and then tensioning roller 9 and the delivery roller 10 - yarn abrasion The fluff generating roller 11
In this process, the air is entangled again by the air entanglement nozzle 13 between the delivery roller 10 and the relaxation roller 12, and the cheese 14 is wound.

That is, as described above, the fluff yarn of the present invention uses two or more multifilament yarns, and performs a fluid entanglement treatment in advance by providing alignment or a yarn supply difference, and using the entangled yarn as a guide. The yarn on the forward path toward the guide and the yarn on the return path toward the guide are interlaced with each other under tension, so that the two yarns are twisted and handled, and then the interlaced yarn is again processed. It can be manufactured by performing a fluid entanglement process.

And since the sheath yarn uses denier yarn thinner than the core yarn, if yarn-yarn scraping is performed, the fine denier sheath yarn is easily fuzzed, and more than half of the protruding yarn portion is occupied by sheath yarn. Become.

In this manufacturing method, prior to the interlacing of the multifilament yarns, pre-applied fluid entanglement is very important in forming the core / sheath structure. By performing such a pre-entanglement process, it is possible to prevent the occurrence of a nep and an increase in fluff length due to handling during the next interlacing process, to average the variation in yarn strength and to prevent a decrease in strength, and to reduce the fluff. Deterioration can be suppressed. Such a suppression effect can be further improved by performing the fluid entanglement process again after the interlacing process.

Further, when the real twist is further inserted into the multifilament yarn as a first twist prior to the interlacing treatment, the fluff having a short fluff is increased, and a fluff yarn having higher quality can be obtained. For example, in the case of a 75-denier polyester filament yarn, a preferable actual twist number is 150 T / m or more.

In the present invention, the crossing process is performed between the yarns while the multifilament yarns are running, so that the mutual yarns change constantly with time. Therefore, the yarn quality does not change due to the wear over time unlike the conventional blade.

It is necessary to perform this yarn-to-yarn interlacing process under tension. By imparting torsion and handling to the multifilament yarn by the interlacing treatment under this tension, fluff, slack, loop, etc. can be formed in a part of the filament single yarn. The tension at the time of applying the tension is preferably at least 0.5 g / d on the return path side and 0.2 g / d or more on the outward path side.

In the present invention, the twist given by the crossing treatment is preferably at least 180 ° or more, more preferably 360 ° or more. In the interlacing process, by giving a twist of 180 ° or more, more than half of the outer circumference of the yarn can be brought into frictional contact with the other yarn, thereby cutting the filament single yarn in the yarn longitudinal direction and the single yarn. Can be randomized between. Therefore, the randomization of the cutting makes it possible to further uniform the thread streaks.

Further, as described above, in the case where the pretwist is inserted into the multifilament yarn before the interlacing treatment, it is preferable that the twist direction and the intertwisting direction be the same.
By making the twisting direction and the twisting direction the same, the number of fluffs generated can be increased and the fluff feet can be shortened. In the reverse direction, the number of fluff is small, and the thread streak is not good.

Example 1 Polyester 30 denier 12 with shrinkage of 19.5% serving as core yarn
The filament yarn, the polyester 30 denier 6 filament yarn having a shrinkage ratio of 10.5% and the 3 yarns of polyester 30 denier 72 filament yarn having a shrinkage ratio of 9.5%, which are shrunk yarns, are aligned, and the overfeed ratio is + 2%. At a fluid pressure of 3 kg / cm ² at a running speed of 300 m /
Minutes, wrap around the guide roller under high tension of 31g on the outbound side and 88g on the inbound side, and twist and handle about 360 ° by interlacing the yarn on the outward side and the yarn on the backward side. And then entangled again with a 3 Kg / cm ² entanglement nozzle to obtain a fluff.

The obtained fluff yarn had a large number of protruding yarn portions such as fluff, slack, and loops on the surface, and the ratio of the fluff of the sheath yarn was 85% of the whole.

Further, this fluff yarn had a short fluff foot, and had a small amount of yarn unevenness in the yarn longitudinal direction and a uniform line of yarn. In addition, the fluctuation rate of the strength was 8.1%, which was very small. The properties of the yarn (JIS method L-1073) were as follows.

Strength (g) 294 Elongation (%) 11.4 Boiling (%) 17.2 U% 2.3 (Yarn speed 25 m / min, Normal Test, using a Twelveger yarn unevenness testing machine) Number of fluff and slack (co / m) Yarn surface From 0.35mm or more 210 〃 0.85mm 〃 105 (using FRAY COUNTER MODEL-104 manufactured by Toray Industries, Inc., yarn speed 50m
/ Min, tension 0.1 g / L) After the above-mentioned fluff yarn was treated in boiling water (98 ° C) in a relaxed state for 20 minutes, the yarn length difference between the core yarn and the sheath yarn was 10.4%. .

Comparative Example Polyester multifilament yarn 100 denier 48
False twisting while rubbing the filament with a blade,
The fluff yarn was manufactured and the yarn characteristics were measured.

Manufacturing conditions of fluff yarn Number of temporary twists 2800T / M Set temperature 210 ° C Overfeed rate + 2% Blade Round bar with diamond powder fixed to surface of diameter 5mm Rubbing place False twisting and twisting area Characteristics of fluff Rate 12.5% Fluff, sag number (co / m) 0.35 mm or more 151 0.85 mm or more 138 Strength (g) 208 Elongation (%) 8.4 U% 5.3 Comparison of U% by yarn unevenness tester indicates that the present invention Is 30% smaller, the fluctuation rate of strength is 4.4% lower, the yarn streak is good, and the fluctuation of strength is small. As for the fluff foot, the fluff of 0.85 mm or more from the yarn surface, the number of slacks is small, the number of fluffs is 0.35 mm or more, many short fluff feet, and few long fluff feet.

[Effects of the present invention] The present invention has a soft spun-like feel and a short length by adopting the above structure, while being intended for a fluff composed of raw silk having no temporary twist crimp. It is possible to provide a fluff yarn having a large number of fluffs, excellent strength properties, uniform yarn streaks in the yarn longitudinal direction, and a small variation rate in strength.

With respect to gloss, use of a triangular cross-section yarn or a glossy yarn for the sheath yarn gives a silky spun-like appearance and feeling.

Next, since the shrinkage ratio of the fluff yarn is high, a high-density woven fabric having fluff can be obtained, and the feeling of cotton-like is excellent.

In the yarn processability, since the yarn strength of the fluff yarn can be maintained by the strength of the core yarn, the operation can be performed relatively stably without a significant decrease in the strength as in the prior art.

[Brief description of the drawings]

FIG. 1 is a model diagram showing an example of a fluff yarn according to the present invention. FIG. 2 is a process schematic diagram showing one example of a method for producing a fluff yarn according to the present invention. 1: core yarn, 2: sheath yarn, 3: fluff portion, 4: slack portion, 5: loop, Y _1, Y _2: multifilament yarns, 6,7: feed roller, 8:
Air entangled nozzle, 9: tension roller, 10: delivery roller, 11: fluff generation roller, 12: relaxation roller, 13: air entangled nozzle, 14: cheese

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-46142 (JP, A) JP-A-52-155245 (JP, A) JP-A-61-124639 (JP, A) JP-A 63-146 112742 (JP, A) JP-A-61-632 (JP, A) JP-A-57-193547 (JP, A) JP-B-48-7891 (JP, B1)

Claims (2)

(57) [Claims] 1. A core / sheath type multifilament in which the single fiber filament denier of the sheath yarn is smaller than the core yarn and not more than 2.5 d, and the sheath yarn has a yarn length difference of 5% to 50% with respect to the core yarn. Fluff, sagging on the surface of non-crimped filament
It has a protruding yarn portion consisting of a loop, and the protruding yarn portion is entangled with the filaments of the core yarn and the sheath yarn and is constrained to the yarn surface, and 50% or more of the protruding yarn portion is a sheath yarn. A fluff yarn characterized by the following. 2. The fluff yarn according to claim 1, wherein at least the sheath yarn is a modified cross-section yarn.