JP2970431B2 - Latent bulky composite yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a potentially bulky composite yarn for a woven or knitted fabric having softness, flexibility, moderate dryness, moderate waist, drapability and surface change.

[0002]

2. Description of the Related Art Until now, polyester multifilaments have been used for various purposes including apparel applications and industrial materials, taking advantage of their excellent properties. For clothing applications, those that impart properties such as softness, swelling and drape beyond silk are well known as new synthetic fibers such as micro powder touch and peach skin touch. For example, composite yarns composed of a plurality of multifilaments having different heat shrinkage characteristics have excellent characteristics such as bulge, bulkiness, and warm feeling, and are widely used.
However, when all the multifilaments constituting the yarn shrink by heat, due to the binding force of the structure of the woven or knitted fabric,
While the difference in shrinkage rate of the yarn cannot be secured enough,
Only after shrinking the yarn in the fabric than the shrinkage of the low shrinkage yarn (shrinkage of the yarn in the fabric after the final finish)-(shrinkage of the low shrinkage yarn), but (shrinkage of the high shrinkage yarn> shrinkage of the yarn in the fabric) At the time of contraction)
The difference in yarn length is only manifested, so the difference in yarn shrinkage cannot be used unless the shrinkage of the fabric is considerably large, and if the fabric is shrunk too much, the woven and knitted fabric becomes hard, especially due to the heat shrinkage of the high shrinkage yarn. For this reason, measures have been taken such as reducing the basis weight to allow for shrinkage allowance, and increasing the alkali weight loss rate in order to secure the feeling. But,
Increasing the cloth shrinkage rate by reducing the basis weight of the cloth caused the cloth surface to become less rough and reduced the product quality, such as uneven shrinkage. Furthermore, as described above, filaments having a large heat shrinkage are generally hardened by heat treatment, and a satisfactory texture cannot be obtained.If the weight loss rate is increased to cover this, the fabric strength decreases. Practically enough swelling could not be obtained.

[0003] On the other hand, mixed yarns of a polyester fiber which expands by heat treatment and a fiber which shrinks are also known, for example, JP-A-60-28515, JP-A-50-148651, and JP-A-56-14851. -1234
No. 19, JP-A-55-62240, JP-A-5-62240
These are disclosed, for example, in JP-A-6-12537 and JP-A-54-93120.

Among these, Japanese Patent Application Laid-Open Nos. 60-28515 and 50-14, which are composite yarns of filaments.
Although the thing described in JP-A-8651 can obtain a much softer and softer feeling than that of the above-mentioned shrinkable yarns, the surface of the woven or knitted fabric has a substantially constant shrinkage and elongation of each filament, As shown in FIG. 2, although it was a multilayer, it had a monotonous crimp form, so that the appearance was too smooth (monotonic) and had no surface change and no depth. In addition, since the shrinkage rate of the filament of the shrinkage component was low, the width and length of the entire fabric were small, the tentering set could not be sufficiently performed, and the quality and feeling of the finished fabric were poor.

Further, JP-A-56-123419,
JP-A-55-62240, JP-A-56-1125
No. 37, JP-A-54-93120 and the like are blended yarns of a heat-extensible fiber and a heat-shrinkable fiber, and are wool-like bulky yarns having a silk-like surface quality. I couldn't.

Further, since these are spun yarns, the resistance between the fibers due to twisting is large, the fibers cannot be freely expanded and contracted, and there is also the above-mentioned binding force with cloth,
It has a completely different appearance and feel from the composite yarn of filaments, and has a soft, flexible, dry touch and moderate beam, waist, drape and surface change, and a deep appearance that is the object of the present invention. No knitting was obtained.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned conventional drawbacks in polyester filaments, and to provide soft, flexible, elegant dry touch and moderate beam, waist, drapability and surface change, and depth. Another object of the present invention is to provide a novel latent bulky composite yarn having a satisfactory appearance and having no problem in the post-process passability.

[0008]

The latent bulky composite yarn of the present invention has the following constitution in order to solve such a problem. That potential bulkiness composite yarn Article of the present invention, the lower
Polyester multifilament A 20-80% (denier ratio) and polyester multifilament B 80-20% (denier ratio) satisfying the above conditions, respectively.
And a composite yarn which is entangled at a entanglement degree of 20 to 120 / m without substantially a difference in yarn length between the multifilament A and the multifilament B. By performing knitting, weaving, dyeing, and setting, a yarn length difference between the multifilament A and the multifilament B is developed, and each single yarn constituting the multifilament A is twisted and irregular on the surface of the woven or knitted fabric. A latent bulky composite yarn characterized by forming a three-dimensional crimp and projecting in various loops at various heights .

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a model diagram (cross-sectional view of a fabric) after heat treatment of a woven fabric using a composite yarn of the present invention as a warp to develop a yarn length difference, and FIG. 2 shows a conventional composite yarn. FIG. 3 is a model diagram (cross-sectional view of the woven fabric) after the woven fabric used for the warp is subjected to a heat treatment to develop a yarn length difference.

In FIG. 1, A is a multifilament mainly constituting a sheath portion, which is substantially elongated by a high-temperature heat treatment (multifilament after spontaneous stretching). (A), (b), and (c) are filaments constituting the multifilament A. B is a multifilament constituting the core, which is a multifilament shrunk by heat treatment (multifilament after heat shrinkage). C is a composite yarn C composed of a multifilament A and a multifilament B, and D is a woven weft.

First, the heat shrinkage characteristic of the constituent multifilament, which is the most important requirement in the present invention, will be described. The multifilament A constituting the polyester composite yarn of the present invention has a small difference in shrinkage from the multifilament B in a process such as ordinary sizing. For this reason, even when the same yarn length difference is expressed in the fabric, even when sizing at the yarn stage, the yarn length difference (bulge, loop, etc.) does not appear so much, and compared to the normal shrinkage mixed fiber yarn, which is all heat shrunk. In weaving, the handling and weaving properties are much better. That is, the multifilament A and the multifilament B
Naturally, when a yarn length difference (loop) appears, the loop rubs during beaming and weaving, causing the loop to catch on guides, combs, and the like, and the opening becomes poor, so that the process passability is significantly reduced. Furthermore, when a normal heat-shrinkable multifilament is subjected to a heat treatment such as sizing, the heat set is almost fixed by the heat treatment, and the heat set is 160 to 18 in the final set or the like.
Even when subjected to a high-temperature heat treatment at about 0 ° C., the yarn length difference does not appear much more than at the time of the first heat setting, but as in the composite yarn of the present invention, it shrinks with hot water but elongates with a high-temperature heat treatment corresponding to the final set. By including the multifilament, the multifilament A protrudes in a loop shape by finishing at a higher temperature than the shrinked cloth surface as a whole, and a soft and flexible touch as if it were a peach surface can be obtained. Therefore, SHW (A) ≧ −1%, SHD
(A) ≦ 0% is essential. Further, SHD (B) -SHD (A) ≧ 10% is required to provide swelling and bulkiness, and if this value is less than 10%, the swelling and bulkiness are inferior and are excluded from the present invention. However, if it is too large, the loop protruding from the surface becomes too large, and problems such as "tekari" at the time of ironing and snagging at the time of wearing are likely to occur. Therefore, this value is preferably 50% or less. For the same reason, SHW (A) is preferably 5% or less, and SHD (A) is preferably -15% or more.

Next, the elongation at break D of the multifilament A
E is at least 50% in order to obtain a soft and flexible hand. In general, in order to obtain a soft feeling with polyester, it is easier to obtain a filament having a smaller SHW and a larger elongation at break. This is because spontaneously elongated multifilaments cover the surface of the fabric in a loop as described in detail above, and the touch of the multifilament determines the touch of the fabric. However, if the elongation at break is too large, the handleability deteriorates.
%, More preferably 80% or less.

Next, what is important in the composite yarn of the present invention is that
As shown modelly in FIG. 1, the composite yarn is knitted and woven,
By performing the dyeing and setting treatment, at least the multifilament A elongated by the heat treatment has a yarn length difference from the multifilament B, and the respective filaments (a) constituting the multifilament A are formed on the surface of the woven or knitted fabric.
(B) and (c) form a three-dimensional crimp of torsion and irregularity to project in a loop. In the conventional composite yarn, as shown in FIG. 2, the multifilament A is composed of a plurality of filaments (d), (e), and (f) having substantially the same yarn length. As a result, a monotonous loop was formed, and the surface of the woven or knitted fabric became smooth and monotonous. That is, the filaments (a), (b), and (c) shown in FIG.
Has a more irregular shape of the crimp than the filaments (d), (e) and (f) of FIG.
(B) (c) are not united to form a monotonous loop, but these (b) (b) (c)
Form the inside, outside, and inside of the loop, and even in the same loop, the height protruding from the fabric surface of (a), (b), and (c) varies. As a result, the woven or knitted fabric obtained by knitting and dyeing the composite yarn of the present invention and performing dyeing and setting treatments has not only an appearance but also a slightly different elasticity and softness depending on the position of the cloth in the tactile sensation. It is a feeling.

In the present invention, the elongation at break of the multifilament B is preferably 40% or less, because yarn unevenness due to elongation of the composite yarn in a post-process such as rewinding or weaving does not occur. Further, it is to prevent a problem such as a knee drop in a product after the fabric is formed. Further, since the breaking strength of the composite yarn is also substantially dependent on the heat-shrinkable multifilament, the heat shrinkage, the breaking strength of the multifilament B is at least 3.5 g / denier, and the multifilament B in the composite yarn is at least 20% in denier ratio. There must be. Of course, if the breaking strength is high, the ratio of the multifilaments B may be slightly lower. However, if it is less than 20%, the shrinkage of the multifilaments B becomes small and the bulge due to the difference in yarn length is not exhibited, so that it is excluded from the present invention.
The breaking strength of the multifilament B is preferably 4.0 g.
/ Denier or more, and the multifilament B in the composite yarn is preferably at least 20 % in denier ratio. The 100 ° C. hot water shrinkage and the 160 ° C. dry heat shrinkage of the multifilament B are 5 to 60%, respectively.
0-80% is required. Preferred 100 ° C. hot water shrinkage and 160 ° C. dry heat shrinkage are 10 to 55%, respectively.
13-70%. Further, in order to further emphasize the natural touch and appearance, a so-called thick and thin yarn having a thickness unevenness in the fiber axis direction of the multifilament B may be used.

In the present invention, the multifilament A
The single-denier must have a denier of 3 denier or less. If it exceeds 3 denier, the elongation at break is large, and even if the Young's modulus is low, the hand becomes coarse and hard, so it is excluded from the present invention. However, if it is too thin, it will be a filament having an irregular cross-section as described later, and it will lose its stiffness. However, a mixture of 3 denier or more may be mixed (denier mix), and it is sufficient if the average is 3 denier or less.

In the present invention, the multifilament A
The cross-sectional shape of each filament is not particularly limited, but a filament having a large elongation at break such as the present composite yarn is soft but easily slimy. This is preferable because the number of parts increases and a dry touch is obtained. Here, the irregular cross-section refers to a cross-sectional shape such as a triangle, a hexagon, a flattened shape, or a hollow shape having at least one concave portion on the outer peripheral surface of the cross-section.

Further, the multifilament A is preferably composed of ten or more filaments of these single yarns in order to provide such feeling and effect.

Next, the composite yarn has a substantially core / sheath structure because the multifilament A is present in a large amount in the surface layer portion of the composite yarn, so that the loop easily projects from the surface of the fabric. The term “substantially having a core / sheath structure” as used herein means only a structure which is divided into a core part and a sheath part, that is, a multifilament B and a multifilament A at a certain interface of the composite yarn. Rather, it also means a structure in which both components are mixed in the entire composite yarn, especially near the boundary surface, and the multifilament B is mainly disposed in the core and the multifilament A is mainly disposed in the sheath. The multifilament B is larger than the multifilament A by a weight ratio within a radius of 1/3 from the center of the composite yarn, and the multifilament A is larger than the multifilament B within a radius of 1/3 from the surface of the composite yarn. It is within the scope of the present invention. The core / sheath structure and the above-described denier ratio were measured by fixing the composite yarn with an epoxy resin and randomly measuring 10%.
The cross section cut zero times is observed with an optical microscope, and the average value and state are determined from this.

Further, in the present composite yarn, there should be substantially no yarn length difference between the multifilament A and the multifilament B before the heat treatment. This is because curling and sagging due to the difference in yarn length occur even when the degree of entanglement described later is added. For this purpose, the number of loops of the confounding degree is 1/10 m
(Measured by a fly counter manufactured by Toray Industries, Inc.) The following is preferred. Although the present composite yarn has substantially no yarn length difference (loop, sag) in this way, it is also essential that the composite yarn is entangled at a entanglement degree of 20 to 120 / m. When the degree of entanglement is less than 20 / m, the multifilaments are squeezed and the yarn is easily separated due to a difference in yarn length, which significantly impairs the processability. Conversely, if the degree of entanglement exceeds 120 / m, interlaced spots are conspicuous in the fabric, and the monofilament of the multifilament A may be cut and become fuzzy, which is not preferable. In the present invention, the composite yarn is preferably entangled at a degree of entanglement of from 30 to 90 strands / m.

Next, the cross section of the multifilament B constituting the inner layer is not particularly limited, but the hollow fiber is used for giving bulkiness, and the cross section is used similarly to the multifilament A for further emphasizing the dry hand. A modified cross-section yarn having at least one concave portion on the outer peripheral surface is also preferable. Further, multifilament A is used in the polyester composite yarn of the present invention.
If necessary, both or one of the component and the multifilament B component may contain a polyester fiber containing a copolymer such as a metal salt of 5-sodium sulfonic acid or isophthalic acid or a fine powder inert substance.

Next, the composite yarn is preferably in a burned state. However, if the twist is too strong, a difference in yarn length is unlikely to occur, and therefore, it is preferably 15000 / √D (T / m) or less. However, when softness and flexibility are not required, the present invention is not necessarily limited to this.

Next, a method for producing the polyester composite yarn of the present invention will be described. FIG. 3 illustrates a schematic diagram of the apparatus configuration of the apparatus for producing a polyester composite yarn of the present invention. In the apparatus for manufacturing a composite yarn shown in FIG. 3, a polyester multifilament (1), a feed roller (2), a hot roller
(3), first delivery roller (4), guide (I), non-contact heater (5), guide (II), second delivery roller
(6), an air jet nozzle (7), a third delivery roller (8), a winding drum (9), and a composite yarn (10) are arranged in this order. A, B and C in the figure are a multifilament A, a multifilament B and a composite yarn, respectively.

Polyester multifilament A having excellent spontaneous elongation and elongating to generate twist and irregular shape
First, spinning speed of 1500 to 4000 m / mi
n, the undrawn yarn spun by ordinary method or uneven cooling, or randomly mixed with a polymer having a different viscosity and spun is obtained from Tg to Tg + 20 ° C.
The elongation at break is 30 to 55%, Δn
No drawn yarn in the range of 0.10 to 0.14
Vibration is applied to the yarn during heat treatment to create a difference in heat setting.
Tighten Rukoto is required. Spinning speed 1500m / min
If it is less than 1, the physical properties after stretching are unstable, and the onset of spontaneous elongation is not good. On the other hand, if it exceeds 4000 m / min, the heat shrinkage after stretching is low, the spontaneous elongation is low, and the feeling as a woven or knitted product does not become a predetermined one. Preferably 2000
４4000 m / min. The stretching temperature needs to be Tg or more for stretching stability. At a temperature of Tg + 20 ° C. or more, crystallization proceeds and spontaneous elongation decreases. The stretching temperature is important for the development of spontaneous elongation, but it is necessary to set the elongation at break to 30% or more in terms of operability such as yarn breakage during stretching. If the elongation at break is 55% or more, spontaneous elongation is difficult to be obtained, which is not preferable. In addition, Δn needs to be in the range of 0.10 to 0.14, and outside of this range, the stability of spontaneous elongation due to the relaxation heat treatment is lacking. Next, it is a preferable method to apply a vibration to the yarn during the relaxation heat treatment using a non-contact type heater that gives spontaneous elongation to give a difference in heat history between the filaments.

This polyester multifilament A
With a multifilament B different from the polyester multifilament A in a denier ratio of 20 to 80% / 80 to
20-120 cores / m according to 20%
To perform confounding processing. Here, the different multifilaments refer to those having different heat shrinkage characteristics, such as SHW and SHD.

After dyeing and setting, the yarn length difference
In order to obtain a woven or knitted fabric having good swelling, tension, waist, and bulkiness, the polyester multifilament B component may have a boiling water shrinkage of 5% or more and a dry shrinkage of 160 ° C of 10% or more. If both are lower than this, a sufficient yarn length difference cannot be obtained, and a woven or knitted fabric having a good feeling cannot be obtained.

It is also important to carry out interweaving so that the denier ratio becomes 20 to 80%. When the spontaneously extensible polyester multifilament A is less than 20%, it swells and the bulky property becomes insufficient. Tension, no waist. The degree of entanglement is 20 to 120 to obtain a handleability in twisting, warping, weaving and a uniform appearance in a woven or knitted fabric.
Co / m. If it is less than 20 cores / m, the polyester multifilament A and the polyester multifilament B are easily separated, and the handleability in the next step is reduced. When it exceeds 120 cores / m, a uniform appearance cannot be obtained with a woven or knitted fabric. With the above configuration, it is possible to obtain a composite yarn of the polyester multifilament A and the polyester multifilament B, which is excellent in handleability, spontaneous elongation, and productivity.

[0027]

EXAMPLES The structure, operation and effect of the present invention will be described with reference to the following examples, but the present invention is not limited to the following examples.

The measuring method used in the present invention is as follows. (1) Elongation at break, strength at break According to JIS-L-1013 (1981), a sample length (gauge length) 2 using Tensilon manufactured by Toyo Baldwin Co., Ltd.
The SS curve was measured at 00 mm and a pulling speed of 200 mm / min, and the breaking elongation and breaking strength were calculated.

(2) Heat shrinkage (SHW), dry heat shrinkage (S
HD) According to JIS-L-1073. That is, a wrapped reel is wound eight times with an initial load of 1/10 g / denier on a wrap reel having an appropriate frame circumference, a load of 1/30 g / denier is applied to the awning, and the length l ₀ (mm) is measured. Then, the load is removed, and the scab is immersed in boiling water for 30 minutes with a load of 1/1000 g / denier applied. Thereafter, the moss is taken out of the boiling water, and after cooling, a load of 1/30 g / denier is again applied to measure the length l ₁ (mm). Then, the litter collected in the same manner is applied with a load of 1/30 g / denier and the length l ₀ (mm) is measured. Then, the load is removed, and heat treatment is performed in an oven at a dry heat of 160 ° C. while applying a load of 1/1000 g / denier. Then, after cooling, a load of 1/30 g / denier is applied again, and the length l ₂ (mm) at that time is measured. Hot water shrinkage (S
HW) and dry heat shrinkage (SHD) are calculated by the following equations. SHW = [(l ₀ −l ₁ ) / l ₀ ] × 100 SHD = [(l ₀ −l ₂ ) / l ₀ ] × 100

(3) Degree of Entanglement A yarn of an appropriate length is taken out and suspended vertically by applying a load of 1/10 g / denier to the lower end. Then, an appropriate needle is pulled out of the thread, and the distance l (cm) of slowly lifting and moving until the load is lifted is measured 100 times. From this, the average value Im (cm) is obtained and calculated by the following equation. Degree of confounding = 100 / (2 × lm)

(4) Thread Form of Degree of Elongation The woven fabric was photographed with a scanning electron microscope so that the form of the thread as shown in FIG. 1 could be recognized, and the crimp form and the difference in yarn length were determined.

[Example] As a heat-extended multifilament, ordinary polyester was spun in a conventional manner at a spinning speed of 3000 m.
/ Min, discharge rate 10.6 g / min (denier 32d)
(Using a three-leaf cross section, 18 holes as NZ)
The stretching and relaxing heat treatments are performed by the apparatus shown in FIG. 3 using a hot roller (3) at a temperature of 80 ° C. and a stretching magnification of 1.6 times.
Guides were provided at positions I and II at 50 ° C. and an overfeed of 50%, and the heat treatment was performed at 200 Hz while giving heat set differences between filaments and in the length direction.

As the heat-shrinkable multifilament, a commercially available Toyobo ester 30 denier 18 filament type 709 manufactured by Toyobo Co., Ltd. was used as B in FIG.
Here, the air jet nozzle (7) uses an air jet FG-1 manufactured by Fiber Guide Co., Ltd. to adjust the air pressure and the feed ratio between the feed roller (6) and the delivery roller (8) so as to obtain the target confounding degree. Was adjusted.

The composite yarn is twisted at 350 T / M in a conventional manner,
It was sized and dried at low temperature (drying temperature 75 ° C.). Using this composite yarn as a warp, a commercially available polyester 75 denier 72 filament 3000 T / M decin was used for the weft, and the warp density was 163 yarns / inch and the weft density was 96 yarns / i.
After weaving nch, scouring, relaxing, pre-setting, 3
The alkali was reduced by 0%, then dyed and finished by a conventional method to obtain a woven fabric. The hand and appearance of the woven fabric were determined.

Comparative Example As a comparative example, a composite yarn and a woven fabric were obtained in the same manner as in the example except that the positions I and II were fixed without being changed.

Heat-expandable multifilament A, heat-shrinkable multifilament B and composite yarn C of Examples and Comparative Examples
Table 1 shows the physical properties of the heat-elongated multifilament E, the heat-shrinkable multifilament B, and the composite yarn F of Comparative Examples.

[0037]

[Table 1]

The woven fabric obtained from the composite yarn of the example is shown in FIG.
The filament A extended as described above has a yarn length difference from the filament B, and each single yarn constituting the multifilament A forms a three-dimensional crimp of twist and irregular shape to form a loop on the fabric surface. Since it protruded at various heights, the surface appearance of the woven fabric was natural and the touch was natural. Of course, the fabric was soft and bulky, and had a micro powder touch. On the other hand, the woven fabric obtained from the composite yarn of the comparative example had good softness, bulkiness, and micropowder properties, but the crimped form of the elongated filament was monotonous as shown in FIG. Was.

[0039]

As described above, the potentially bulky composite yarn of the present invention is described.
Knitting weaving and dyeing, textile, which is more obtained and the child to perform a set process, compared to the combined filament yarn comprising a conventional self-extension yarn, organic softness, loft, a sense of new synthetic fiber, such as micro powder of Furthermore, it has softness, elegant dry touch and moderate beam, waist, drapability and surface change, and has a deep appearance, surface touch, appearance has moderate change never before It has a remarkable effect that it becomes natural and the processability of the composite yarn is excellent.

[Brief description of the drawings]

FIG. 1 is a model diagram (cross-sectional view of a woven fabric) after a woven fabric using a composite yarn of the present invention as a warp is subjected to a heat treatment to develop a yarn length difference.

FIG. 2 is a model diagram (cross-sectional view of a woven fabric) after heat treatment is performed on a woven fabric using a conventional composite yarn as a warp to develop a yarn length difference.
It is.

FIG. 3 is a schematic diagram of an apparatus configuration of an apparatus for producing a polyester composite yarn.

[Explanation of symbols]

(A) ... heat-expanded multifilament A (B) ... heat-shrinkable multifilament B (C) ... polyester composite yarn (D) ... weft (1) ... polyester multifilament (2) ... feed roller (3) ... hot roller (4)… First delivery roller (5)… Non-contact heater (6)… Second delivery roller (7)… Air jet nozzle (8)… Third delivery roller (9)… Winding drum (10 ) ... Composite yarn (I) (II) ... Guide (A) (B) (C) ... Single yarn constituting multifilament A

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification symbol FI D01F 6/62 303 D01F 6/62 303K (58) Investigated field (Int.Cl. ⁶ , DB name) D02G 3/04 D02G 1 / 18 D02G 3/22 D02J 1/02 F-term theme code 4L036

Claims (1)

(57) [Claims] 1. A polyester multifilament A 20 to 80% (denier ratio) and a polyester multifilament B 80 to 20 each satisfying the following conditions :
% (Denier ratio), wherein the composite yarn is entangled at a entanglement degree of 20 to 120 / m with substantially no yarn length difference between the multifilament A and the multifilament B, By knitting, dyeing and setting the composite yarn, a yarn length difference between the multifilament A and the multifilament B is developed, and each single yarn constituting the multifilament A is formed on the surface of the woven or knitted fabric. A latent bulky composite yarn, characterized in that it forms a three-dimensional crimp of twist and irregular shape to project in a loop at various heights . Multifilament A: undrawn yarn spun at a spinning speed of 1500 to 4000 m / min
Is stretched at Tg to Tg + 20 ° C. to obtain an elongation at break.
Drawn yarn in the range of 30 to 55%, Δn 0.10 to 0.14
Vibration is given to the yarn during the relaxation heat treatment.
It is manufactured by making the heat set difference
There fineness average of each filament: 3 denier, SHW (A): - 1~5 %, SHD (A): - 15~0
%, And Ru DE (A) ≧ 50% der. Multifilament B: breaking strength: 3.5 g / denier or more, SHW (B): 5 to 60%, and SHD (B): 10
Here, SHW: hot water (100 ° C.) shrinkage (%), SHD: dry heat (160 ° C.) shrinkage (%), and DE: elongation at break (%).