JP3312197B2 - Composite united spun yarn, method for producing the same, and woven / knitted fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite conjugated spun yarn obtained by binding a fiber bundle composed of a thermoplastic multifilament yarn and a short fiber bundle with a wound fiber bundle composed of short fibers, a method for producing the same, and a woven or knitted fabric. Things.

[0002]

2. Description of the Related Art Conventionally, as this kind of composite united spun yarn W
For example, as shown in FIG. 3, the fiber bundle W ₃ winding the fiber bundle M consisting of short fiber bundles W ₂ Metropolitan disposed thermoplastic multifilament yarn W ₁ and the sheath portion disposed in the core portion consisting of the short fibers A structure having a unity is known.

[0003] The composite united spun yarn has a characteristic that the twisting torque is smaller than that of the ring spun yarn and that pilling is less likely to occur in a woven or knitted fabric. There is no flexibility, and the texture of a woven or knitted fabric using this yarn becomes hard, and in order to compensate for this, synthetic fibers having a latent three-dimensional crimping ability in the core as shown in JP-A-61-75844 are used. A technique has been proposed in which, after knitting or weaving, heat treatment is performed to make the crimps visible by heat treatment, thereby expressing bulkiness and swelling properties and improving the texture of the woven or knitted fabric.

[0004]

However, in the above-mentioned conventional structure, after the knitting or weaving processing, the crimp is made to be obvious by heat treatment. The bulkiness is not sufficiently exhibited, and there is an inconvenience that the woven or knitted fabric may have a rough and hard texture.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem. Among the present invention, the invention according to claim 1 is a thermoplastic multifilament disposed on a core portion. A composite bundle spun yarn obtained by subjecting a fiber bundle consisting of a yarn and a short fiber bundle arranged in a sheath portion to a composite bundle spun yarn obtained by bundling with a wrapped fiber bundle composed of short fibers and performing a false twisting process including heat treatment. In addition, the invention according to claim 2 binds a fiber bundle composed of a thermoplastic multifilament yarn disposed in a core portion and a short fiber bundle disposed in a sheath portion by a wound fiber bundle composed of short fibers. A method for producing a composite tied spun yarn comprising: preparing a composite tied spun yarn comprising: Thermoplastic Composite tying spinning made by subjecting a fiber bundle consisting of a chifilament yarn and a short fiber bundle arranged in a sheath portion to a composite tying spun yarn obtained by bundling with a wrapped fiber bundle made of short fibers and false twisting including heat treatment. It is a woven or knitted fabric which is woven and knitted using all or a part of the yarn and subjected to relaxation processing including heat treatment.

The invention according to claim 4 is characterized in that the composite bundled spun yarn subjected to the false twisting including the heat treatment has an elasticity recovery ratio of 3% or more. The invention described in Item 5 is characterized in that the ratio of the thermoplastic multifilament yarn in the composite united spun yarn is from 20% to 70%.

[0007] The thermoplastic multifilament yarn referred to herein is a thermoplastic filament yarn composed of single denier of 3 denier or more, and has stretch and bulkiness by heat treatment such as false twisting. Further, it refers to a long fiber to which stiffness and resilience are added.
0 denier 24 filaments (manufacturer: Unitika Ltd., product name: Z-10), 75 denier 15 filaments of polybutylene terephthalate elastic yarn (manufacturer: Teijin Limited, product name: fine cell) or polyester multifilament 75 denier 24 filament semi-dull yarn (manufacturer: Teijin Limited, product name: Tetron low count yarn SD), etc. In addition, the stretch recovery rate is 3% or more by false twisting including heat treatment after composite binding spinning Any yarn can be applied as long as it can obtain 5% or more.

[0008] The expansion / contraction restoration rate is determined by treating a sample in hot water at a predetermined temperature for 20 minutes.
000 + 1/10) A value expressed by the following equation when the length of the sample under a load of gf / denier is L ₁ and the length of the sample under a load of 2/1000 gf / denier is L _2. (J
IS-L1090).

[0009] Stretch restoration ratio (%) = (L ₁ -L ₂ ) / L ₁ × 100

The short fibers in the present invention are synthetic fibers such as polyester fibers and acrylic fibers, cellulosic fibers, silk, wool, hemp, etc., and are selected according to the texture and function required for woven or knitted fabrics. become.

[0011] The ratio of the thermoplastic multifilament yarn in the conjugated spun yarn of the present invention is about 20% to 7%.
It is preferably 0%.

[0012] The reason is that when the proportion of the thermoplastic multifilament yarn exceeds 70%, the convergence of short fiber bundles is lacking, yarn defects such as neps increase, and 20%
If it is less than this, the characteristics of the thermoplastic multifilament yarn are hardly exhibited, which is not preferable.

[0013] In the false twisting process after the composite binding spinning according to the present invention, the false twisting is preferably performed in a direction in which the short fibers wound by the air swirl nozzle during the composite binding spinning are twisted.

In the case of false twist in the direction of untwisting,
This is because the short fiber bundles fall off from the thermoplastic multifilament yarn, which hinders the production of a good composite-bound spun yarn.

Since the false twist condition depends on the thermoplastic multifilament yarn and the short fiber bundle,
It is necessary to select conditions suitable for each yarn.

[0016]

1 and 2 show an embodiment of the present invention.
For example, in FIG. 1, short fiber bundles bundled in a string form
W_TwoAre, for example, a back roller BR, an apron device AP and
And a draft device D consisting of
And the draft rate of the draft device D is
Of the short fiber by the draft device D
Wada W _TwoIs evenly expanded, for example, about 30 to 500 times.
And is pulled through the apron device AP of the draft device D.
Stretched short fiber bundle W_TwoWound around bobbin B in the center
Thermoplastic multifilament yarn W₁Under constant tension
At the front of the front roller FR so that the short fibers
Bundle W_TwoThermoplastic multifilament yarn W₁
And then the front row of the draft device D
Thermoplastic multifilament yarn W from LA FR₁When
Short fiber bundle W_TwoIs rotated in the opposite direction.
Air swirl nozzle device N₁And nozzle device N_TwoTwo airs
Twisting the fiber bundle M through the false twisting device N consisting of nozzles
False twisting and untwisting are applied to increase the binding strength between fibers.
In addition, a short fiber bundle W is provided around the fiber bundle M._TwoSome staple fibers
Wound fiber bundle W consisting of_ThreeIs bound by
Thermoplastic multifilament yarn arranged at the core
W₁And short fiber bundle W arranged in a sheath portion_TwoFiber bundle consisting of
M is a wrapped fiber bundle W made of short fibers_ThreeUnited by
Composite bound spun yarn W is created, and as a package,
It will be wound up.

In FIG. 2, the composite tie spun yarn W produced by the above-described process is pulled out of a package (not shown), for example, a nip roller NR ₁ and a heater section H,
The composite united spun yarn W is supplied to a pin-type false twisting machine T composed of a rotating unit T ₁ and a nip roller NR _2, and is softened by a heater unit H, and is fixed at the nip rollers NR ₁ and NR ₂ . _{By one} rotation, NR ₁ −T ₁
During twisting, the twist is added to the composite tie spun yarn W and heat-set, and between T _{1 and} NR ₂ , the twist is nearly zero and untwisted to the original state. the false twisting including a heat treatment by the heater unit H is subjected, by false twisting including a heat treatment by the texturing machine T, the remaining thermoplastic multifilament yarn W ₁ helically twisted habit is,
A crimping effect is exerted, and the bulking effect and the stretchability are potentially imparted by the crimping effect, whereby the composite united spun yarn W of the present invention is manufactured.

Then, the composite united spun yarn W is used for weaving and knitting by using the whole or a part thereof in combination with other yarns, and weaving and knitting of the woven and knitted fabric. Relaxation processing such as infiltration is performed, and the heat treatment during the relaxation processing reveals the bulkiness and stretch function that were latent in the composite united spun yarn W, and a woven / knitted fabric having bulkiness and stretch function is manufactured. become.

In the false twisting process after the composite binding spinning according to the present invention, the false twist is preferably performed in a direction in which the short fibers wound by the air swirling nozzle device are twisted during the composite binding spinning. Is false twist in the direction of untwisting,
This is because the short fiber bundles fall off from the thermoplastic multifilament yarn, which hinders the production of a good composite-bound spun yarn.

The false twisting condition depends on the thermoplastic multifilament yarn and the short fiber bundle.
It is necessary to select conditions suitable for each yarn.

The characteristics of this woven or knitted fabric are not only due to the expansion / contraction function exhibiting a large expansion / recovery rate that can be exhibited by the thermoplastic multifilament yarn alone, but also due to the frictional force of the short fibers surrounding the thermoplastic multifilament yarn. New texture resulting from the excellent morphological stability obtained by the morphological retention function.

[0022]

[Example 1] As a thermoplastic multifilament, a polyester side-by-side type conjugate yarn 100 denier 24 filament (hot water shrinkage 5.
69%), using cotton sliver 55 gel / yard as short fibers, spinning speed 145 m / min, feed ratio 0.97, first stage nozzle pressure N ₁ = 3.0 kg.
f / cm ² , second stage nozzle N ₂ = 4.0 kgf / c
m ² , ratio of thermoplastic multifilament to short fiber 4
7:53, the composite tie spinning was performed to prepare a 30th yarn, and then the composite tie spun yarn was fed to the first feed rate +
2.5%, heater temperature 220 ° C, number of false twists 2500T /
Processing was performed using a pin-type false twisting machine including a heat treatment with a heater under the conditions of m, to obtain the composite united spun yarn. Then, in a plain wind-through structure, the warp is changed to one of cotton 180/2 and cotton 60/2, and the weft is made into a woven fabric using cotton 180/2 count and a composite united spun yarn 30 /-. It is put into the inside and performs a washer bodging process as a relaxing process. By the relaxing process including the heat treatment with hot water, the bulkiness and the stretching function that were latent in the composite tied spun yarn W become apparent, and then the tenter tentered. Was done. The density of the woven fabric is 44 warps /
cm, weft density 24 yarns / cm, fabric width shrinkage 41%
(Woven Width-Finish Width) × 100 / (Woven Width) The finished composite spun yarn had a proper texture due to the elasticity of the conjugated spun yarn, a form stability due to kickback property, and a new texture.

[Comparative Example 1] In the above-mentioned Example 1, a woven fabric was produced under the same conditions except that false twisting was not performed on the composite tie spun yarn W produced by composite tie spinning. The density of the finished fabric is 36 warps / c.
m, the weft yarn density was 24 yarns / cm, and the fabric width shrinkage ratio was 9%. The expression of effective crimp was small, the kickback property was weak, and the texture was firm.

Comparative Example 2 In Example 1, a polyester-based side-by-side conjugate yarn was subjected to false twisting before composite bunching and spinning was performed under the same conditions, and a woven fabric was manufactured under the same conditions. . Also in this case, a stretchable woven fabric as in Example 1 could not be obtained.

[Example 2] Using a polybutylene terephthalate-based elastic yarn 75 denier 15 filaments (hot water shrinkage rate 13.64%) as a thermoplastic multifilament, composite binding spinning was performed under the same conditions as in Example 1 to obtain Performed false twist processing including heat treatment on the obtained composite united spun yarn,
The 30th yarn was obtained. The obtained yarn was knitted using a circular knit sock machine of 10.9 yarns / inch, and the finished knit was subjected to scouring and dyeing as relaxing processing,
Due to the heat treatment during the relaxing process, the composite united spun yarn W
The bulkiness and stretch function that had been latent in the surface became apparent,
The yarn was removed, and a knitted fabric was manufactured using a 14 gauge weft knitting machine by a knit / denit method. This knitting is
The product has good stretchability of the yarn, stretch in both the wale direction and the course direction, tension and form stability, and short fiber texture.

The present invention is not limited to the above embodiment, but the thermoplastic multifilament thread, the material, thickness and number of short fibers are appropriately selected. For example, a belt type or an air swirling type may be adopted, and the structure of the draft device may be appropriately designed and changed, and the thickness of the composite united spun yarn of the present invention may be changed. In addition to the so-called slab yarn in which the thickness of the yarn is changed to fine and thick by the drafting device, the slab yarn is also included.

[0027]

According to the present invention, as described above, according to the first or second aspect of the present invention, the composite twisted spun yarn is subjected to false twisting to provide a large expansion and contraction that can be exhibited by the thermoplastic multifilament yarn alone. In addition to the elasticity function showing the restoration rate, the new texture that is obtained by the excellent morphological stability obtained by the morphological retention function caused by the frictional force of the short fibers surrounding the thermoplastic multifilament yarn can be obtained. In this way, it is possible to obtain a conjugated spun yarn that can exhibit excellent stretching function and morphological stability, which could not be obtained conventionally, and that each short fiber possesses by appropriately selecting the short fiber in the conjugated spun yarn. A synergistic effect between the texture and the stretching function can be obtained, and in the invention according to the third aspect, a woven or knitted fabric having a stretching function and form stability can be obtained.

[0028] In the invention according to claim 4, the composite twisted spun yarn subjected to the false twist processing including the heat treatment has an expansion / contraction recovery ratio of 3% or more, thereby providing an expansion / contraction function and form stability. Can be obtained more clearly, and in the invention according to claim 5, the ratio of the thermoplastic multifilament yarn in the composite conjugated spun yarn is from 20% to 70%. As a result, the convergence of the short fiber bundle is good, yarn defects such as neps are suppressed, and the characteristics of the thermoplastic multifilament yarn are well exhibited.

As described above, the intended purpose can be sufficiently achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a production process of a composite united spun yarn according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a production process of a composite united spun yarn according to an embodiment of the present invention.

FIG. 3 is an explanatory perspective view of a composite united spun yarn.

[Explanation of symbols]

W Composite united spun yarn W ₁ Thermoplastic multifilament yarn W ₂ Short fiber bundle W ₃ Fiber bundle with winding

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hideki Akehoya 2-7-113, Mitsuke-shi, Niigata Pref., Niigata Prefectural Institute of Advanced Industrial Science and Technology Material Application Technology Support Center (56) References 8-158184 (JP, A) JP-A-61-289142 (JP, A) JP-A-61-75844 (JP, A) JP-A 9-119038 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02G 3/36-3/38 D02G 1/00-1/02 D03D 15/00 D03D 15/04

Claims (5)

(57) [Claims] A composite conjugated spun yarn obtained by tying a fiber bundle composed of a thermoplastic multifilament yarn disposed on a core portion and a short fiber bundle disposed on a sheath portion with a wrapped fiber bundle composed of short fibers. Composite united spun yarn subjected to false twisting including heat treatment. 2. A composite conjugated spun yarn obtained by tying a fiber bundle composed of a thermoplastic multifilament yarn disposed on a core portion and a short fiber bundle disposed on a sheath portion with a wrapped fiber bundle composed of short fibers. A method for producing a composite united spun yarn, comprising: producing and subjecting the composite united spun yarn to false twisting including heat treatment. 3. A composite conjugated spun yarn obtained by tying a fiber bundle composed of a thermoplastic multifilament yarn disposed on a core portion and a short fiber bundle disposed on a sheath portion by a wrapped fiber bundle composed of short fibers. A woven or knitted fabric which is woven and knitted using all or a part of the composite united spun yarn subjected to false twist processing including heat treatment, and subjected to relaxation processing including heat treatment. 4. The composite united spun yarn according to claim 1, wherein a stretch recovery ratio of the composite united spun yarn subjected to false twisting including heat treatment is 3% or more. 5. The composite united spun yarn according to claim 1, wherein the ratio of the thermoplastic multifilament yarn in the composite united spun yarn is from 20% to 70%.