JPH0291236A - Fluff yarn - Google Patents

Abstract

PURPOSE:To obtain fluff yarn comprising core/sheath type multifilament yarn having protruded part such as fluff on the surface, having the protruded yarn part almost made of the sheath yarn and suppressed to the surface of the yarn by entanglement resulting from interlacement of the core yarn and the sheath yarn, uniform yarn stripe and small degree of variability of strength. CONSTITUTION:For example, two multifilament yarns Y1 and Y2 are primarily interlaced by an air interlacing nozzle 8, fluffed by a fluff forming roller 11 and secondarily interlaced by an air interlacing nozzle 13 to give core/sheath multifilament yarn which has protruded yarn parts such as fluffs 3, looseness 4 and loops 5, wherein >=50% of the protruded part comprises the sheath yarn, and is suitable for high-density fabric for sports. The sheath yarn has ultrafine denier of <=1d single yarn filament denier and is preferably modified cross-section yarn of triangle and flat shape. The difference of yarn length between the core yarn and the sheath yarn is >=5% and the core yarn has higher crimp than the sheath yarn has.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluffy yarn consisting of a core/sheath type multifilament yarn with uniform yarn streaks and a small tenacity variation rate. The present invention relates to a fluffy yarn that is preferably used for high-density fabrics with a soft spun-like texture for sports or blousons.

[Prior Art] Conventionally, many attempts have been proposed to achieve the bulkiness of spun yarn by using fluffy yarns of multifilament yarns.

One method is to false-twist the multifilament yarn while rubbing it with a blade, or to false-twist it with a rough-surfaced disk. But 1,
In this method, as the blades and the tracheal disks wear out over time, the quality of the fluffy yarn gradually changes, causing fluff and thick unevenness in the direction of the yarn length, resulting in uneven yarn streaks and poor strength. The disadvantage is that the thread is not constant in the direction of the thread, and the rate of fluctuation is large.

Another method is to false-twist a multifilament yarn in which weak points or partial cuts are intermittently given along the longitudinal direction of the yarn, and then perform an interlacing treatment. However, the fluff yarn obtained by this method has a drawback in that the fluff is crimped, and those with long fluff legs have poor fluff quality and are prone to pilling.

Further, as a publicly known example, there is a method for producing yarn from a film-like material, as described in Japanese Patent Publication No. 43-14196@. In this method, thin film-like filaments made of narrow slits are run through friction under heat and tension to form fibrils, but there is almost no entanglement in the fibrillated parts.
It had the disadvantage of low strength and high fluctuation rate of strength.

[Problems to be Solved by the Invention] An object of the present invention is to solve the above-mentioned conventional drawbacks, and to create a yarn that has uniform yarn streaks in the longitudinal direction, a small rate of change in strength, and short fluff. Core that prevents pilling/
The purpose of the present invention is to provide a pod type fluffy yarn.

[Means for Solving the Problems] The fluffy yarn according to the present invention that achieves the above object has a protruding excess portion such as fluff or slack on the surface of the core/#j type multifilament yarn, and these protruding excess portions form the core. The yarn and sheath filaments are intertwined with each other and restrained on the yarn surface, and 50% or more of the extra protruding portion is made up of sheath yarns.

Incidentally, it is preferable that the difference in length between the two yarns, core/sheath, is 5% or more.

Further, it is preferable that at least the sheath yarn has a single fiber filament denier of 2.5 d or less, and that at least the sheath yarn is composed of a deformed cross-section yarn.

To explain in detail the requirements for forming the fluffy yarn, first, the multifilament yarn is not particularly limited, but at least a thermoplastic synthetic fiber multifilament yarn such as polyester or nylon is used. Also,
The multifilament yarn may be either raw silk or bulk yarn such as false twisted yarn. Suitable yarn types include those that have a large number of single fiber filaments, are thin, and have irregular cross-sectional shapes. In addition, incompletely drawn yarns, thick and thin yarns, etc. can also be used while being stretched.

In particular, for the core yarn, it is preferable that the shrinkage rate is higher than that of the sheath yarn, and it is more preferable that the core yarn and the sheath have a shrinkage difference of 10% or more. To achieve this, it is necessary to use a highly shrinkable raw yarn as the core yarn, for example, in the case of polyester yarn, a copolymerized yarn with isophthalic acid, or a highly oriented yarn obtained by drawing at a temperature below the Tg temperature of the incompletely drawn yarn. It is preferable to use low-crystalline thread.

On the other hand, with regard to sheath yarn, more than half of the fluff and slack of the fluffed yarn is made up of single yarn, and its fineness is preferably at least a fine denier of 2.5 d or less, and an ultra-fine denier of 1 d or less. It is generally preferable that Further, in order to take advantage of the characteristics of higher gloss and soft spun-like texture, it is preferable to use a yarn with a modified cross section, particularly triangular, flat, pentagonal, Y-shaped, etc.

Next, there is the yarn length difference between the core yarn and the sheath yarn, which is the ratio of the actual yarn length of the core yarn and the sheath yarn included in the length of the fluffy yarn. It expresses the ratio of the length of the sheath yarn to the length of , and preferably the yarn length is 5% or more. When the yarn length difference increases, the surface of the fluffed yarn is covered with more fluff and slack of the sheath yarn, and the effect of the fluffed yarn of the present invention can be clearly expressed. On the other hand, a large difference in yarn length also means that the shrinkage rate of the core yarn is large, and since the shrinkage of the fluffy yarn itself is large, a high-density woven fabric can be obtained when used for fabric.

However, if the yarn length difference exceeds 50% or more, the sheath type entanglement will decrease in the yarn longitudinal direction, causing "irritability" in the fabric, disturbing the fabric surface, and making it difficult to create a spun-like texture. Undesirable.

Next, intertwining is given to the mutual entanglement of the core yarn and the sheath yarn, and the entire sheath yarn is entwined with the core yarn, and the fluff, slack, and loops protruding on the surface of the sheath yarn are is formed. 50% or more of the fluff, slack, and loops protrude from the sheath yarn, and the greater this ratio, the greater the spun-like effect of the present invention. On the other hand, if the number of fluffs in the core yarn increases, yarn strength decreases and yarn unevenness increases, making it difficult to handle as a fluffy yarn, which is not preferable.

By reducing the number of fluffs in the core yarn, maintaining yarn strength, and increasing the number of fluffs in the sheath yarn, the effect of the fluffy yarn is clearly expressed, and the core yarn and sheath yarn are intertwined with each other. This is the key point of the present invention.

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

In the figure, 1 is a core yarn, 2 is a sheath yarn, 3 is a fluffy portion, 4 is a slack portion, and 5 is a loop portion.

Next, an example for manufacturing the fluffy yarn of the present invention will be described.

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

Multifilament yarn Y1 and multifilament yarn Y2
are respectively supplied from rollers 6.7 and air entangling nozzles 8.
Then, between the tension roller 9 and the delivery roller 10, the yarn-based friction under high tension is fluffed by the fluff generation roller 11, and then between the delivery roller 10 and the relaxation roller 12. This is the process of post-entangling again using the air entangling nozzle 13 and rolling it up into cheese 14.

In other words, as mentioned above, the unexploited and light fluffy yarns are produced by using two or more multifilament yarns, applying a fluid entanglement treatment in advance by providing alignment or yarn feeding differences, and guiding the entangled yarns. The yarn on the outbound side heading toward the guide and the yarn on the homeward side returning to the guide are interlaced with each other under tension to give twist and handling to both yarns, and then the yarn after the interlacing process is It can be manufactured by subjecting it to fluid entanglement treatment again.

Furthermore, since the sheath yarn uses yarn with a finer denier than the core yarn, when thread-based abrasion is performed, the fine denier sheath yarn is likely to become fluffed, and more than half of the protruding threads are occupied by the sheath yarn. Become.

In this manufacturing method, fluid entanglement provided in advance prior to the interlacing treatment of the multifilament yarns is very important in forming the core/sheath structure.

By performing this kind of pre-interlacing treatment, it is possible to prevent the occurrence of neps and the lengthening of the fluff caused by handling during the next interlacing treatment, to even out the variation in yarn strength, to prevent a decrease in strength, and to prevent the yarn strength from decreasing. It becomes possible to suppress deterioration.

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

Moreover, if a real twist is further inserted into the multifilament yarn as a pre-twist prior to the interlacing treatment, it is possible to increase the number of short fluffs and obtain a fluffy yarn with excellent layer quality. For example, in the case of a 75 denyl polyester filament yarn, the preferred actual twist number is 15 Q twists/m or more.

In the present invention, the interlacing process is performed between yarn systems while the multifilament yarns are running, so that the mutual yarns are constantly changed over time.

Therefore, there is no change in yarn quality due to wear over time unlike in conventional blades.

This process of interlacing yarn systems must be performed under tension.

By twisting and handling the multifilament yarn through this interlacing treatment under tension, fuzz, slack, loops, etc. can be formed in a portion of the single filament yarn. The tension when applying this tension is:
It is preferable that it is at least 0.59 g/d or more on the return trip side and 0.2 g/d or more on the outbound trip side.

Further, in the present invention, the twist imparted by the crossing treatment is preferably at least 180° or more, and more preferably 360° or more. In this way, by giving a twist of 180° or more in the interlacing process, more than half of the outer circumference of the yarn can be brought into frictional contact with the other yarn, thereby making it possible to cut the single filament yarn in the yarn direction and direction. Can be randomized between threads. Therefore, by randomizing the cutting, it becomes possible to make the yarn streaks more uniform.

Further, as described above, when the multifilament yarn is pre-twisted before the interlacing treatment, it is preferable that the direction of twisting and the twisting direction of interlacing be the same direction. By making the twisting direction and the twisting direction the same in this way, the number of fuzz generation can be increased and the length of the fuzz can be shortened.

In the opposite direction, there is less fuzz and the threads are not good.

Example A polyester 30 denier 12 filament yarn with a shrinkage rate of 19.5% that becomes the core yarn, and a shrinkage rate of 10 that becomes the sheath yarn.
．． 5% polyester 30 denier 6 filament yarn and 9.5% shrinkage polyester 30 denier 72
Three filament yarns were aligned and subjected to entanglement treatment at a fluid pressure of 3 Kg/ci at an overfeed rate of +2%.
Next, at a running speed of 300,771 L/min, the yarn is wound around a guide roller under high tension on the forward side 31U1 and the backward side 889, and the yarn on the forward side and the yarn on the backward side are twisted by about 360° by crossing each other. The fibers were then treated again with an interlacing nozzle of 3 threads/ci to obtain a fluffy yarn.

The obtained fluffed yarn had many protruding portions such as fluff, slack, and loops on its surface, and the fluff of the sheath yarn accounted for 85% of the total.

In addition, this fluffy yarn had short fluff legs, and the yarn streaks were uniform with little yarn unevenness in the yarn longitudinal direction. Moreover, the fluctuation rate of strength was 8.1%, which was very small. The properties of the yarn (JIS method L-1073) were as follows.

Strength (y) 294 Elongation (%”) 11.4 Boiling yield (%) 17.2 U% 2.3 (Yarn speed 25 m/min, Normal Te5t
(Using Zellweger yarn unevenness tester) Fuzz, slack number (co/m) 0.35m or more from the yarn surface 210〃 0.8
5Nn! / 105 (FRAY C0 made by Toshi ■
Using UNTERMODEL-104, yarn speed 50TrL/
(measured at a tension of 0.1 g/L) Comparative example 100 denier polyester multifilament yarn 4
8 filaments were subjected to false twisting while being rubbed with a blade to produce a fluffy yarn, and the yarn properties were measured.

Manufacturing conditions for fluffy yarn Tentative number of twists: 28001/)! Set temperature 210'C Overfeed rate +2% Blade False-twisted round bar with diamond powder fixed to the surface of 5 mm diameter Heating area Rubbing area Fluff Characteristics of yarn Strength variation rate 12.5% Fluff, number of slack (Co/ m > 0.35 mm or more 0.85 mm or more Strength (q) 208 Elongation (%) 8.4 U% 5.3 A comparison of U% using a yarn unevenness tester shows that the present invention is 30% smaller and stronger. The fluctuation rate is also 4.4% lower, the yarn has good streaks, and it has the characteristics of less strength fluctuation.As for fluff, there are no fluffs of 0.85 mm or more from the yarn surface and a small number of sag.
It is characterized by having many lengths of 0.35 mm or more, many short fluffs, and few long fluffs.

[Effects of the Invention] First, regarding the texture, fluff and sagging create a spun-like touch, and when the difference in yarn length between the core and sheath increases, the yarn becomes ``bulky'' and bulky, resulting in increased ``warmness.''

Regarding luster, if a triangular cross-section yarn or glossy yarn is used as the sheath yarn, a silky spun-like appearance and texture can be obtained.

Next, since the fluffy yarn has a high shrinkage rate, it is possible to create a high-density fabric with fluff, resulting in an excellent cotton-like texture.

In terms of yarn processability, since the yarn strength of the fluffy yarn can be maintained by the strength of the core yarn, there is no significant decrease in strength unlike in the prior art, and operations can be performed relatively stably.

[Brief explanation of the drawing]

FIG. 1 is a model diagram showing an example of a fluffy yarn according to the present invention. FIG. 2 is a process schematic diagram showing an example of the method for producing fluffy yarn according to the present invention. 1: Core thread, 2: Sheath thread, 3: Fuzzed part, 4: Slack part, 5
: Loop part, Yl, Y2 : Multifilament yarn, 6
, 7: Supply roller, 8: Air entangling nozzle, 9: Tension roller, 10: Delivery roller, 11: Fluff generation roller,
12: Relaxation roller, 13: Air entangling nozzle, 14: Cheese

Claims (4)

[Claims] (1) The surface of the core/sheath type multifilament yarn has protruding yarn parts such as fluff and slack, and these protruding yarn parts are entangled with the mutual entanglement of the filaments of the core yarn and sheath yarn and are restrained by the yarn surface. , and 50% or more of the protruding yarn portions are sheath yarns. (2) The fluffy yarn according to claim 1, characterized in that the yarn length difference between the core and sheath is 5% or more. (3) The fluffy yarn according to claim 1, wherein at least the single fiber filament denier of the sheath yarn is 2.5 d or less. (4) The fluffy yarn according to claim 1, wherein at least the sheath yarn is a yarn with a deformed cross section.