JPH02307926A - Combined filament yarn and production thereof - Google Patents

Abstract

PURPOSE:To obtain combined filament yarn having spun yarn-like feeling by subjecting multifilament yarn having a shrinkage factor difference to fluid combined filament processing while overfeeding the filament yarn on the high shrinkage side of the multifilament yarn at a prescribed % or above and then heat-treating the resultant multifilament yarn. CONSTITUTION:Two or more kinds of multifilament yarns having a shrinkage factor difference are subjected to fluid turbulent treatment with a nozzle 6 while overfeeding filament yarn 2 on the high shrinkage side in >=1% excess of filament yarn 1 on the low shrinkage side from feed rollers 4. The resultant yarns subjected to the fluid turbulent treatment are then heat-treated with a dry heating heater 8, etc., to afford the objective combined filament yarn having >=1.0g/d Young's modulus just after the primary yield point in an S-S curve after treatment in boiling water and +5 to -5% yarn length difference of the filament yarn on the high shrinkage side from the above-mentioned filament yarn on the low shrinkage side.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mixed fiber yarn and a method for manufacturing the same.

More specifically, the present invention relates to a mixed fiber yarn with improved texture, which is made of multifilament yarns of synthetic fibers having different shrinkage rates, and a method for producing the same.

[Prior Art] Many methods have been proposed for producing mixed fiber yarns by subjecting multifilament thermoplastic synthetic fibers having different shrinkage rates to fluid injection processing to obtain fabrics with a spun-like texture.

For example, JP-A No. 59-179836 discloses a special method in which the core yarn is a polyester heat-shrinkable mixed fiber high-shrinkage yarn, and the yarn is composed of high-shrinkage filaments and low-shrinkage filaments. Filament-processed yarns have been proposed. Furthermore, in JP-A No. 60-81345, in a mixed yarn of polyester filaments having different shrinkage rates in boiling water, the single fibers on the high shrinkage side and the low shrinkage side are partially intertwined in the longitudinal direction of the yarn. A mixed fiber yarn with differential shrinkage characterized by the following has been proposed. Furthermore, in JP-A No. 63-182433, it is an interlaced mixed fiber composite yarn having fine loops and walnuts on the surface of the yarn, and the multifilament yarn forming the single fiber group located on the comparative core side is comparatively A latent loop yarn has been proposed that is characterized by a higher shrinkage rate than the multifilament yarns constituting the single fiber group located on the side of the sheath.

However, both techniques have the following problems.

[Problems to be solved by the invention] First, since the yarn structure originally has a high shrinkage yarn on the core yarn side and a low shrinkage yarn on the sheath yarn side, by applying heat treatment, the core yarn becomes more The threads are bundled in the core and become tight, and the sheath threads become more full and taut due to the difference in shrinkage with the core threads. As a result, the fabric becomes fluffy, the core becomes hard, and drapability is lost. In addition, the residual elongation increases by the amount of shrinkage, making it easier to elongate even at low tension.

Therefore, it can cause "sink marks" and "flat spots" on the fabric. Next, the way the core yarn and sheath yarn intertwine is too partially biased toward the core or sheath, which results in poor "convergence" and a deterioration in the quality of the appearance.

Despite the above-mentioned problems, they have not yet been solved, although there has been a demand for high-temperature fabrics as clothing materials have become more sophisticated in recent years.

The purpose of the present invention is to improve the drawbacks of the prior art as described above,
It is an object of the present invention to provide a mixed fiber yarn having a soft spunwriter texture and a method for producing the same.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration.

That is, it is a mixed fiber yarn consisting of at least two types of multifilament systems having different shrinkage rates, and the S
The Young's modulus immediately after the temporary yield point stress in the −8 curve is t,
og/d or more, the yarn length difference between the high-shrinkage filament yarn and the low-shrinkage filament yarn is +5 to -5%, and the at least two types of multifilament yarns have migrated to each other. It is a fine thread.

The mixed fiber yarn of the present invention will be explained in more detail.

The multifilament yarn constituting the mixed fiber yarn of the present invention is made of thermoplastic synthetic fibers such as polyamide and polyester, and the same kind or a combination of different kinds of these synthetic fibers can be applied. Further, there are no particular restrictions on the single fiber denier, number, cross-sectional shape, gloss, dyeability, etc.

However, the multifilament yarn used consists of at least two types having different shrinkage rates when submerged in water. The difference in water shrinkage percentage is 3% or more, preferably 5% or more, more preferably 10% or more.

In addition, the above-mentioned mixed fiber yarn was prepared by winding the mixed fiber yarn 10 times and treating it with boiling water (98°C) for 30 minutes in a free state.
-S curve (strength elongation curve) is drawn and the Young's modulus immediately after the temporary yield point stress is measured to be 1.0 g/d or more. As shown in FIG. 4, Young's modulus is determined as the initial tensile resistance value immediately after the temporary yield point stress.

Normally, when high shrinkage filament yarns with a submergence shrinkage rate of 15% or more are concentrated in the core yarn, the Young's modulus and temporary yield point stress of the mixed fiber yarn are lowered, and in particular, the Young's modulus is 0.6 g/d or less. As a result, it is easy to be pulled under low tension, causing "sink marks" and "vertical lines." However, in the present invention, the high shrinkage filament yarn is dispersed and migrated without being concentrated in the core yarn portion, so the Young's modulus can be set to a high value of 1.0 g/d or more, and the above-mentioned It is possible to improve the disadvantages of the above, and to obtain a mixed fiber yarn with an excellent texture and flexibility. The method for measuring the Young's modulus is the JIS method (L-
1073) using an Instron type tensile measuring machine.

In the blended yarn of the present invention, after blending processing, the difference in yarn length between the core yarn and sheath yarn is that the sheath yarn becomes longer by the ratio of the yarn supply and feed difference, but after spring water treatment, this ratio decreases. Or, it is reversed. This is determined by the shrinkage difference between the core yarn and the sheath yarn, and the yarn feed difference, but from the ``konare'' and bulges, the ratio of the apparent yarn length difference between the sheath yarn and the core yarn after spring water treatment is determined. The condition is +5 to -5%, preferably substantially ±0%.

Conventional differential shrinkage mixed fiber yarns have high shrinkage areas unevenly distributed in the core and low shrinkage areas unevenly distributed in the sheath, but the mixed fiber yarn of the present invention does not have uneven distribution, and the filament yarns do not "melt" together. The result is a yarn structure that undergoes repeated migration.

The mixed fiber yarn of the present invention preferably contains ultrafine filament yarn of 0.1 denier or less. Generally, as the denier decreases, the rigidity decreases and bending becomes softer, but 0.1
If it is less than denier, you can get the texture of peach skin with a slimy feel. It should be noted that a filament type thicker than 0.1 denier cannot be used as a mixed fiber yarn with high irritability.

A yarn cross section showing an embodiment of the mixed fiber yarn according to the present invention is shown in FIG. 1, and a yarn side view is shown in FIG. 2.
Figure (a) shows the yarn cross section and yarn side of a mixed fiber yarn made of a high shrinkage filament yarn 1 and a eluted composite multifilament of a low shrinkage filament yarn 2 after being processed and before being submerged in water, respectively. Figures 1(b) and 2(b) show the yarn cross-section of the mixed fiber yarn after the mixed fiber processing, the relaxing boiling water heat treatment, and further elution of the sea component of the eluted multifilament yarn, and the yarn This is a side view.

Moreover, FIG. 4 shows the S-8 of the present invention and the conventional mixed fiber yarn.
This shows an example of a curve.

Next, a method for producing a mixed fiber yarn according to the present invention will be explained.

In the method for producing a mixed fiber yarn according to the present invention, in at least two types of multifilament yarns having different shrinkage rates, the filament yarn on the high shrinkage side is set to be less than the filament yarn on the low shrinkage side.
It can be manufactured by performing fluid mixing processing while supplying an excess amount of % or more, followed by post-heat treatment.

That is, the present invention uses a low-shrinkage filament yarn as a core yarn and a high-shrinkage filament yarn as a sheath yarn. Then, fluid blending processing is performed while supplying the sheath yarn in excess of the core yarn by 1% or more. When fluid-mixed fibers are processed and heat treated without any difference in yarn supply, the high-shrinkage side is clearly unevenly distributed in the core and the low-shrinkage side in the sheath, and no migration occurs. However, by over-supplying high-shrinkage side and performing a fluid blending process so that it becomes the sheath yarn side, the core/sheath will be reversed during heat treatment, and in the process, migration and uniformity of the core yarn (low-shrinkage side) will occur. This makes swelling more likely. In other words, due to heat treatment, high-shrinkage yarns tend to concentrate in the core, but the low-shrinkage yarns get in the way, making it difficult for them to be placed on the core yarns, while low-shrinkage yarns conversely concentrate in the sheath. Since the yarn on the high shrinkage side gets in the way when it swells, it becomes difficult to place it in the sheath yarn, and it becomes difficult to distinguish between the core and sheath after heat treatment. The core yarn and sheath yarn after blending processing (before flooding treatment) are differentiated by differentiating the yarn feed. Textile processing. Therefore, after the blending process, the filament yarn on the high shrinkage side is arranged as the sheath yarn, and the filament yarn on the low shrinkage side is arranged as the core yarn, resulting in a mixed fiber yarn.

The shrinkage rate difference between both filament yarns is 3% or more, preferably 5%.
% or more. Furthermore, the sheath yarn should be supplied in excess of the core yarn by 1% or more, and preferably 3 to 15%, depending on the difference in shrinkage rate between the two filament yarns. In addition, the difference between the yarn feeding rate FC of the core yarn and the yarn feeding rate Fs of the sheath yarn (F
If S - Fc ) is less than 1%, a mixed fiber yarn with a core/sheath structure cannot be obtained after the fiber blending process. -1% or more, after the fiber blending process, low-shrinkage side yarns that are desired to be placed in the core yarn are placed in the sheath yarn, and high-shrinkage side yarns that are desired to be placed in the sheath yarn are placed in the core yarn.

In the fluid blending process, any of the following may be used: a fiber interlacing process using an interlace nozzle, a false twisting process using a rotating nozzle, a loop process using a fluid turbulence nozzle, and a so-called ``taslan'' process that imparts slack. However, "Taslampa mixed fiber processing" is preferable.

If you use a high shrinkage yarn for the sheath yarn and a low shrinkage yarn for the core yarn, and apply a core/sheath type "Taslampa" process with yarn feeding differences, the core will have a low shrinkage yarn and the sheath yarn will have a high shrinkage yarn. It is possible to produce a core-sheath type mixed fiber yarn in which the fibers form loops or curls.When the mixed fiber yarn is then heat treated, for example, it is relaxed with a dry heat heater, or after it is made into a knitted or woven product, it is relaxed in the dyeing process. When heat-treated, the high-shrinkage yarns of the sheath yarns are placed in the direction of the core, and the core yarns are arranged so as to protrude toward the sheath, so that the core and sheath are exactly reversed.At this time, the core yarns and The sheath threads mix and migrate in a dispersed manner.

Note that the heat treatment may be either dry heat or warm heat, and the heat treatment allows the Young's modulus immediately after the temporary yield point stress in the S-8 curve to be 1.0 g/d or more, and the filament yarn on the high shrinkage side to the filament yarn on the low shrinkage side. It is sufficient if the length difference is +5 to -5%.

The method for manufacturing a mixed fiber yarn according to the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a process diagram showing an example of the method for manufacturing a mixed fiber yarn according to the present invention. In Figure 3, low shrinkage yarn 1 is used as the core yarn.
is supplied from the feed roller 3 and the high shrinkage yarn 2 as a sheath yarn is supplied from the feed roller 4, water is applied by the water application roller 5, fluid turbulence treatment is performed by the "taslan'° type nozzle 6, and the high shrinkage yarn 2 is supplied as the sheath yarn from the feed roller 4. 7. When performing relaxing heat treatment, the relaxation roller 9 and the delivery roller 7
A heater 8 may be provided between the two. Thereafter, the mixed fiber yarn can be manufactured by winding it around the cheese 10 using a winding roller. In addition, when the relaxing heat treatment is not performed, the mixed fiber yarn can be manufactured by winding the cheese 10 directly from the delivery roller 7.

In particular, although the core yarn to be supplied is a filament yarn with a lower shrinkage than the sheath yarn, it is preferable that the spring water shrinkage rate is 10% or less. On the other hand, although the sheath yarn is a filament with higher shrinkage than the core yarn, it is preferable that the spring water shrinkage rate is 10% or more, and the difference in shrinkage rate is 3% or more, preferably 5% or more, and more preferably 1
This is a combination of 0% or more.

For example, the core yarn is a fine denier filament yarn of 0.2 to 1.0 denier, the ultra-fine filament yarn of 0.1 denier or less, the sheath yarn is a Y-shaped or triangular cross-section yarn, and incompletely stretched yarn called POY is used. Yarn, thick and thin yarn, highly shrinkable polyester filament yarn copolymerized with isophthalic acid, etc. are preferably used.

To explain an example of using an eluting multifilament yarn for the core yarn and a high shrinkage polyester filament yarn for the sheath yarn, by blending the fibers, the eluting multifilament yarn is used in the core and the sheath. It is possible to obtain a mixed fiber yarn in which highly shrinkable polyester filament yarns are intertwined by loops or curls. After weaving the mixed yarns, by subjecting them to relaxing heat treatment during dyeing, the sheath yarns move to the core, and the core yarns move to the sheath, and the fibers are remixed by repeating dispersion and migration. Next, after applying a chemical treatment that makes it easier to selectively elute the sea component of the elution-type multifilament yarn with a sea-island structure, the elution treatment leaves an ultra-fine filament yarn of the island component with a diameter of 0°1 denier or less. - It is possible to produce a woven fabric using mixed yarn containing multifilament yarn of 0.1 denier or less, which cannot be obtained by spun yarn.

In addition, the elution type multifilament yarn has a sea-island structure spun from the same spinneret, and has a plurality of island components whose single fiber filament yarn is equivalent to 0.1 denier or less,
It is composed of a woody sea component that completely surrounds the island component and is eluted by chemical treatment. As the island component constituting the sea-island composite fiber, any polymeric substance capable of forming fibers can be used. For example, polyamide,
Polyester, etc. Further, the sea component may be one having a different solvent solubility from that of the island component. Island component
As the combination of sea components, nylon 6 or 6 low polyethylene terephthalate, polyethylene terephthalate, nylon 6 or 6 low polystyrene, etc. can be used. Among these, polyester is suitable for the island component, and polyester copolymerized with dimethyl 5-sodium sulfoisophthalate is suitable for the sea component.

Note that a split type composite system may be applied instead of the elution type multifilament.

Example 1 A 60 denier, 144 filament polyester multifilament system with 5.6% water shrinkage;
A mixed fiber yarn was manufactured under the following conditions using a 50 denier, 24 filament polyester multifilament yarn having a water-immersion shrinkage rate of 8.1%.

Overfeed rate (%) Filament yarn on low shrinkage side +5 Filament yarn on high shrinkage side +10 Delivery roller speed (m/min) 300 Nozzle type Taslan'° type ■ema jet T-311
Driftwood injection pressure (k(1/a() 5.

The obtained mixed fiber yarn was woven under the following conditions, and then dyed and finished to produce a woven fabric.

Warp yarn Polyester 75 denier, 72 filament triangular cross-section yarn ' Weft yarn The above mixed fiber structure 1/3 twill relax scouring 98℃ x 30 minutes dyeing Terasil Navy Blue 5-
GL3%0Wf130℃×40 minutes The Young's modulus after the primary yield point stress in the S-S curve of the weft yarn obtained by decomposing the woven fabric is 7.8 g/d, and the apparent yarn length difference is -
It was 2.5%. The yarn length difference before dyeing is +5.
It was 1%.

Example 2 50 denier, 9-filament polyester-based eluting composite fiber multifilament yarn with a water shrinkage rate of 8.1% (island component: polyester, sea component: copolymerized polyester of dimethyl 5-sodium sulfoisofukuroate) , elution number near 0/'1 single fiber filament), and 5
0 denier, 24 filament, water shrinkage rate is 18.1
Example 1 using polyester filament yarn that is %
A mixed fiber yarn was produced in the same manner as above, further woven, and dyed and finished under the following conditions to obtain a woven fabric.

Relaxation scouring 98℃×30 minutes acid treatment 3g/α maleic acid 130℃X
30 minutes sea removal treatment NaOH40g (Sal)/Q98
℃×55 minutes Staining process Terasil Navy Blue
e 5-GL3%owf, 130°C for 40 minutes The Young's modulus of the weft yarn decomposed from the fabric immediately after the primary yield point stress in the SS curve is 5.
3 g/d, and the apparent yarn length difference was -1.5%.

The difference in yarn length is determined by dividing the weft yarn into fibers, and calculating the length α1 of the filament yarn on the high shrinkage side and the length α2 of the filament yarn on the low shrinkage side.
was measured and calculated using the following formula.

Yarn length difference%) = ((α1-0.2 ＞/l) x10
0 Comparative Example 1 Using the same filament system as in Example 1, high acid M I
Jl, using the filament yarn of 1 as the core yarn and the filament yarn on the low shrinkage side as the sheath yarn, the core yarn is +5% and the sheath yarn is +5%.
A mixed fiber yarn was produced at 10% under the same conditions. moreover,
A woven fabric was obtained by weaving and dyeing and finishing under the same conditions as in Example 1.

The Young's modulus is 0.8g in the yarn properties of the woven fabric.
/d, yarn length difference -9.8%. Note that the yarn length difference before dyeing was +5.1%.

Comparative Example 2 Using the same filament yarn as in Example 2, using the filament yarn on the high shrinkage side as the core yarn and the eluting multifilament yarn as the sheath yarn, the core yarn was +5% and the sheath yarn was +10%. A mixed fiber yarn was produced under the same conditions. Further, the fabric was woven and dyed under the same conditions as in Example 2 to obtain a fabric.

Regarding the yarn properties of the fabric, as shown in FIG. 4, the Young's modulus was 0.6 g/d, and the yarn length difference was -7.1%.

[Effect] In the mixed yarn after spring water treatment, the filament yarns of high shrinkage yarn and low shrinkage yarn intermingle with each other in the yarn cross section, are moderately dispersed without being unevenly distributed in the core or sheath, and are aggregated as a whole. However, since it has a bulge, it improves the texture of "fluffy" and hard core, and improves drapability and "falling".
It is possible to obtain a soft spun-like texture with a soft texture.

The yarn length difference between the core yarn and sheath yarn is extremely small, and the core/sheath reversal or migration that occurs during the flooding process makes it possible to obtain a blended yarn with good "softness" and to prevent entanglement.
There are no "uneven threads" or "irritations" in dyeing, resulting in an extremely plain and even surface effect, making it possible to obtain high-quality products.

By improving the Young's modulus in the S-8 curve, it is possible to improve the "sink marks" and "vertical lines" that occur during the subsequent process, and to strengthen the tension and waist feel of the product.

By including ultrafine filament yarns of 0.1 denier or less, a suitable amount of sliminess is added and a peach skin touch texture can be obtained.

If you use a highly shrinkable yarn with an irregular cross section, such as a triangular cross section yarn,
Drapability, luster, or mild softness can be further promoted.

For example, if the surface of the blended yarn before submergence treatment is bulky, intertwined with loops and slack due to air mixing, after spring water treatment, the loops and sagging of the sheath yarns will cut into the spaces between the core yarns, causing the core yarns to On the contrary, it stands out on the yarn surface and becomes bulky due to sagging or crimping, making it possible to obtain a product with a soft spun-like texture.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment of the mixed fiber yarn according to the present invention, and FIG. b) is a sectional view after spring water treatment. Figure 2 is a side view of the mixed yarn shown in Figure 1, Figure 2 (a) is a side view before water treatment, Figure 2 (b) is a side view after spring water treatment. Fig. 3 is a process chart showing an example of the method for producing a mixed fiber yarn according to the present invention. Fig. 4 shows the S-8 curve of the present invention and a conventional mixed fiber yarn after spring water treatment. An example is shown below. Low shrinkage filament yarn 2: High shrinkage filament system 3: Feed roller (for core yarn) 4: Feed roller (for sheath yarn) 5: Water application roller 6: Fluid turbulence nozzle 7 : Delivery roller 8: Heater 9: Relaxation roller 10: Cheese'

Claims (5)

[Claims] (1) A mixed yarn consisting of at least two types of multifilament yarns having different shrinkage rates, S-S after boiling water treatment
Young's modulus immediately after the temporary yield point stress in the curve is 1.0g
/d or more, the yarn length difference between the high shrinkage filament yarn and the low shrinkage filament yarn is +5 to -5%,
A mixed fiber yarn characterized in that the at least two types of multifilament yarns have migrated to each other. (2) The mixed fiber yarn according to claim 1, characterized in that it contains a filament yarn of 0.1 denier or less. (3) For at least two types of multifilament yarns having different shrinkage rates, the filament yarn on the high-shrinkage side is subjected to fluid blending processing while being supplied in excess of 1% or more over the filament yarn on the low-shrinkage side, and then subjected to post-heat treatment. Characteristic method for manufacturing mixed fiber yarn. (4) The method for producing a mixed fiber yarn according to claim 3, wherein the difference in shrinkage rate is 3% or more. (5) The method for producing a mixed fiber yarn according to claim 3 or 4, characterized in that an elution type composite multifilament yarn is used as the core yarn.