JPH07118973A - Production of special combined filament yarn dyeable to dark color - Google Patents

Abstract

PURPOSE:To provide a process for the production of a special combined filament yarn dyeable to dark color and giving a cloth having excellent dyeability to deep color, free from dyeing speck and exhibiting soft feeling with crispness and stiffness. CONSTITUTION:Plural undrawn polyester yarns having breaking elongation difference of >=300% and a birefringence difference of >=0.06 are aligned, interlocked, subjected to draw false-twisting at a processing draw ratio of 1.10-1.40 under heating at a yarn temperature of 70-100 deg.C at the outlet part of a heater and finally heat-treated at >=150 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a deep-dyeing special mixed yarn, and more specifically, it has an excellent bathochromic effect and is substantially not crimped. ,
The present invention relates to a method for producing a deep-dyeing special mixed fiber that can be used as a fabric having a soft texture with tension and elasticity.

[0002]

2. Description of the Related Art Conventionally, two polyester filament yarns having different cutting elongations are aligned, air-entangled, and subsequently false twisted to form a high elongation yarn around a low elongation yarn. There have been proposed many methods for producing a two-layer structure yarn wound in an alternating twisted yarn form (for example, Japanese Patent Publication No. 60-11130).

Further, Japanese Patent Publication No. 61-19733 discloses a method for producing a so-called false twist wound processed yarn having a spun yarn-like texture.

Further, Japanese Unexamined Patent Publication No. 64-14331 describes that a false twisting process at a high temperature makes it possible to obtain a material for clothes having a sharp feel and a refreshing feel.

Further, Japanese Patent Application Laid-Open No. 2-293411 discloses a method of producing a special mixed yarn having a unique texture by performing draw false twisting at room temperature to 78 ° C.

However, all of these methods produce a crimped bulky textured yarn in which the cross-sectional shape of a filament single yarn is deformed by false twisting, and the obtained textured yarn is a spunlike yarn. Alternatively, it has a crisp feeling, a refreshing feeling, and unlike the mixed yarn produced by the method of the present invention, which is not substantially crimped, has a tight, elastic and soft texture. No fabric can be obtained.

Moreover, the method disclosed in Japanese Patent Application Laid-Open No. 2-293411 has a problem in that stretching false-twisting occurs at a low temperature, so that stretching unevenness sometimes occurs, resulting in dyeing unevenness.

On the other hand, Japanese Patent Publication No. 60-11130, Japanese Patent Publication No. 61-19733, and Japanese Patent Publication No. 64-14331.
According to the method described in Japanese Patent Laid-Open Publication No. JP-A No. 2004-187, the dyeing property of the obtained processed yarn is poor, and a deep-dyeing yarn excellent in bathochromic effect cannot be obtained.

[0009]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to have no stain spots, excellent bathochromism, and tension.
It is an object of the present invention to provide a method for producing a deep-dyeing special mixed filament yarn that can be used as a fabric having a soft and soft texture.

[0010]

According to the present invention, a plurality of polyester undrawn yarns having a difference in cutting elongation of 300% or more and a difference in birefringence of 0.06 or more are aligned and subjected to a entanglement treatment. After that, it is heated at a processing magnification of 1.10 to 1.40 so that the yarn temperature immediately after the heater exit becomes 70 to 100 ° C., subjected to draw false twisting, and then heat treated at 150 ° C. or higher. A method for producing a deep-dyeing special mixed filament yarn is further provided, in which heating during drawing false twisting is performed at a heater temperature of 90 to 130 ° C. for a heating time of 0.15 to 0.23 seconds. A method for producing a dyeable special mixed yarn is provided.

The unstretched polyester yarn having a lower breaking elongation and a higher birefringence has a breaking elongation of 50 to 100.
%, And the birefringence is preferably 0.07 to 0.13.

No polyester used in the present invention
As the polyester constituting the stretched yarn, for example,
Phthalic acid or its ester-forming derivative and the formula HO (CH
₂) _pPolyalkylene glycol having OH (provided that
p is an integer of 2 to 10)
Mention may be made of esters, especially dimethyl terephthalate.
Polyethylene produced from ethylene and ethylene glycol
Terephthalate is preferred.

Further, if necessary, a third component such as other glycols, difunctional carboxylic acids, oxycarboxylic acids or the like in an amount of about 15 mol% or less with respect to terephthalic acid may be copolymerized. Examples of the third component that can be copolymerized include 3,5-dicarboxybenzenesulfonic acid, adipic acid, sebacic acid, isophthalic acid, diphenylsulfonedicarboxylic acid, naphthalenedicarboxylic acid, and oxybenzoic acid as acid components. Examples of the glycol component include trimethylene glycol, propylene glycol, cyclohexanedimethanol, neopentyl glycol and the like.

Further, the polyester may be mixed with another polyester of 15 mol% or less. Also, matting agents such as titanium oxide, light resistance improving agents such as ultraviolet absorbers,
A heat resistance improver such as an antioxidant, an antistatic agent, and other fine powder inactive substances may be contained.

The polyester unstretched yarn having a difference in elongation at break and a difference in birefringence is melt-spun polyester by a conventional method,
At that time, it can be easily obtained by appropriately changing the spinning speed, the single yarn fineness, the spinning yarn cooling condition and the like.

In the present invention, this cutting elongation difference is 30.
It is necessary that 0% or more and the difference in birefringence be 0.06 or more. Elongation difference less than 300%, birefringence difference 0.06
If it is less than the above range, the interfiber voids of the obtained mixed yarn are small and the bulge due to self-expansion is small, so that the soft texture with tension and elasticity which is the object of the present invention cannot be obtained.

Further, the high-elongation yarn cannot be uniformly dispersed outside the low-elongation yarn, which causes a problem that uneven dyeing occurs. In order to prevent the generation of nep and improve the weaving property, it is desirable that the difference in cutting elongation is 500% or less and the difference in birefringence is 0.10.

The undrawn yarn having a smaller elongation used in the present invention preferably has a breaking elongation of 50 to 100% and a birefringence of 0.07 to 0.13. If the cutting elongation is less than 50% and the birefringence exceeds 0.13, the region near the drawn yarn is approached and fluff tends to occur during draw false twisting, so the draw false twisting speed must be reduced. There is a risk of lowering productivity and increasing costs.

Further, the cross-sectional shape of the single yarn is deformed by the draw false twisting process, and a substantial crimp is given, so that the special texture desired by the present invention may not be obtained.

On the other hand, if the breaking elongation exceeds 100% and the birefringence is less than 0.07, surging (yarn shake) is likely to occur during draw false twist, and in order to prevent this, draw false twist at a high draw ratio. Is required, and as a result, low elongation yarn (core yarn)
And the high elongation yarn (sheath yarn) have poor conjugation property, which causes stain spots.

The composite ratio of the polyester undrawn yarn having a low breaking elongation and a high birefringence and the polyester undrawn yarn having a high breaking elongation and a low birefringence, the latter of which contributes to a soft texture, It is preferable to occupy 50% or more.

FIG. 1 is a schematic front view showing an example of an apparatus for carrying out the method of the present invention, which is a polyester undrawn yarn 1 having a low cutting elongation and a high birefringence, and a high cutting elongation. The polyester unstretched yarn 2 having a low birefringence is aligned with the yarn blending snell guide 3, and fed to the pair of supply rollers 5 and 5'through the tension adjusting device 4.

An air entanglement nozzle 6 is provided between the supply rollers 5 and 5'and the pair of intermediate rollers 7 and 7'to provide entanglement to the aligned polyester undrawn yarns 1 and 2. To do. This confounding process is commonly described in US Pat.
985,991 and US Pat. No. 3,110,1.
The value measured by the hook-drop method described in Japanese Patent No. 51 may be such that the degree of entanglement is 10 to 80 entanglements / m.

A first heater 8 and a false twisting tool 9 are provided between the intermediate rollers 7 and 7'and the pair of delivery rollers 10 and 10 '. Here, a drawing false twisting process is performed. It

In this case, the processing magnification between the intermediate rollers 7, 7'and the delivery rollers 10, 10 'is 1.10 to 10.
It should be 1.40, preferably 1.15 to 1.40.

If the processing ratio is too small, surging is likely to occur due to insufficient twisting tension, and fluff and dyeing spots are generated due to twisting unevenness. If it is too much, not only do fluff and yarn breakage frequently occur during processing, but also the quality of the fabric is degraded.

Further, the important point in the present invention is that the first
This means that heating is performed so that the yarn temperature immediately after the exit of the heater 8 becomes 70 to 100 ° C., and the draw false twisting process is performed.

This temperature is lower than the temperature in the case of ordinary drawing false twisting. By performing the drawing false twisting in such a relatively low temperature range, excellent bathochromism and cross-sectional shape are obtained. 2 is not deformed, as shown in FIG.
It is possible to produce a deep-dyeing special mixed filament yarn which is substantially crimp-free and has a slight corrugation M, which makes it possible to obtain a fabric having a soft texture with tension and elasticity. it can.

If the yarn temperature immediately after the outlet of the heater is less than 70 ° C., the false twisting tension will be high, fluff and yarn breakage will increase, and stains will occur, which is not suitable. On the other hand, this yarn temperature is 1
When the temperature exceeds 00 ° C, the cross section of the single yarn is deformed and crimp is imparted substantially, and the crimping performance (TC) is increased, as in the case of the ordinary drawn false twisted yarn. The soft and peculiar texture, which is the object of the present invention, cannot be obtained because of the fluffy texture. In addition, the dyeability also deteriorates, and a dense dyed mixed fiber cannot be obtained.

The yarn temperature immediately after the outlet of the heater is 70-100.
The temperature of the heater may be set to 90 to 130 ° C., and the heating time may be set to 0.15 to 0.23 seconds in order to set the temperature to ℃.

After the drawing and false twisting, the second heater 11 provided between the delivery rollers 10 and 10 'and the pair of take-up rollers 12 and 12' is heat-treated. This heat treatment is performed at 150 ° C. or higher, preferably 150 to 255 ° C., and it is desirable that the obtained mixed fiber yarn has a boiling water shrinkage ratio of 5 to 15%.

When the boiling water shrinkage ratio exceeds 15%, the low elongation yarn floats on the surface of the mixed fiber and exhibits whitish dyeing unevenness, and it is difficult to obtain the desired deep dyeing property and soft texture, and the boiling water shrinkage ratio is high. If it is less than 5%, the high elongation yarn is too much on the surface,
The feeling of roughness becomes stronger and it becomes difficult to obtain the desired soft texture.

Further, by the heat treatment by the second heater 11, the high elongation yarn is set to the low elongation yarn, and the weaving property (unwinding property) and handleability of the mixed fiber yarn are improved.

The heat treatment after the drawing false twisting process does not necessarily have to be carried out immediately after the drawing false twisting process, but it is desirable to carry out immediately after the drawing false twisting process (immediately after the untwisting process) in consideration of the change in shrinkage rate due to aging. .

The yarn thus heat-treated is taken up by the take-up rollers 12, 12 'and wound on the winder 13 as cheese 14.

[0036]

According to the present invention, a plurality of polyester undrawn yarns 1 and 2 having a large difference in cutting elongation and a large difference in birefringence are aligned and subjected to entanglement treatment, and then, within a specific processing magnification range, immediately after the heater exit. The polyester unstretched yarn 1 has a low breaking elongation and a high birefringence because it is heated at a relatively low temperature and subjected to a stretch false twisting process so that the yarn temperature is 70 to 100 ° C.
Is difficult to stretch, the cutting elongation is high, and the unrefined polyester yarn 2 having a low birefringence is easy to be stretched. It will be stretched uniformly. Moreover, since the drawing false twisting temperature is relatively low, crystallization does not proceed due to the drawing false twisting process, and a deep-dyeing mixed yarn having extremely excellent bathochromism can be obtained.

Further, since a relatively high temperature such as a heater temperature of 160 to 240 ° C. is used in the ordinary drawing false twisting process, the cross-sectional shape of the processed single yarn is deformed, and as shown in FIG. 2 (a). While crimping is given to give a span-like texture or a crisp feeling, in the method of the present invention, the drawing false twisting is carried out within a lower temperature range than in the case of the usual drawing false twisting. Therefore, the false twist is untwisted without being heat set, the cross-sectional shape is not deformed, and as shown in FIG. 2 (b), the crimp is not substantially applied and the minute waveform M is slightly present. It is only necessary to produce a deep-dyeing special mixed-fiber yarn that can be combined with the above-mentioned difference in elongation and difference in birefringence to form a cloth having a soft texture with tension and elasticity.

Further, in the present invention, unstretched polyester yarn having a large difference in elongation and a large difference in birefringence is used. Therefore, dyeing unevenness should easily occur, but the optimized conditions of the present invention are preferable. It is considered that the high elongation yarns are uniformly drawn and evenly dispersed on the outside of the low elongation yarns by the combination of the above combinations, so that dyeing unevenness does not occur. In the method of the present invention, when the difference in elongation and the difference in birefringence of the polyester undrawn yarn become small, stains on the contrary tend to occur.

[0039]

EXAMPLES The present invention will now be described in more detail with reference to examples.

The boiling water shrinkage (BWS) and bathochromic property were measured as follows. (1) Boiling water shrinkage (BWS) About 3000 denier ridges were made, and 0.1 g / de
Then, the original length L ₀ (cm) was read. Change the load on the ridges to 2 mg / de, and add this to 3 in boiling water.
After treating for 0 minutes and then drying at room temperature, the load is changed to 0.1 g / de, the length L ₁ (cm) is read, and the boiling water shrinkage rate (BWS, unit%) is calculated by the following formula. It was calculated. Boiling water shrinkage rate = {(L ₀ −L ₁ ) / L ₀ } × 100

(2) Bathochromicity A bathochromaticity (K / S) was used as a measure of bathochromaticity. This value was obtained by measuring the spectral reflectance (R) of the sample cloth with a Shimadzu RC-330 type self-recording spectrophotometer and using the following Kubelka-Munk formula. The larger this value, the greater the bathochromic effect. Chromaticity (K / S) = (1−R) ² / 2R where K is the absorption coefficient and S is the scattering coefficient.

[0042]

Examples 1 to 3 and Comparative Examples 1 to 3 Spinning speed 1300 m
Melt elongation at a cutting rate of 380% and birefringence of 0.
013 polyethylene terephthalate undrawn yarn (85d
e / 24fil) and unspun polyethylene terephthalate yarn (75de / 12fi) having a cutting elongation of 60% and a birefringence of 0.086, which is melt-spun at a spinning speed of 5000 m / min.
1) and were aligned, and drawn and false twisted by the apparatus shown in FIG.

First, the undrawn yarns 1 and 2 that have been aligned are supplied to the air entanglement nozzle 6, and the overfeed rate is 1.0.
%, And 40 kg / cm2 of entanglement under the conditions of 4 kg / cm2 of compressed air pressure, and then using a triaxial friction false twisting device in which the disk rotates at a surface speed of 630 m / min, draw false twist speed 350 m / min, processing magnification 1.25 times, tension K value (T ₂
/ T ₁ ) 23/35 = 0.66, and false false twisting was performed.

At this time, the temperature of the first heater 8 and the yarn temperature immediately after its exit were changed as shown in Table 1. The heating time at this time was 0.17 seconds.

After that, subsequently, the second heater 11 at 200 ° C. was heat-treated at an overfeed rate of 0% and wound by a winder 13 to obtain a mixed fiber of 130 de / 36 fil. The appearance and characteristics of the obtained mixed fiber were as shown in Table 1.

The mixed yarn thus obtained was twisted at 800 T / m and woven into a twill structure. The obtained green machine was subjected to a relaxation treatment at a boiling temperature for 20 minutes by a rotary washer to make a grain, and then preset by an ordinary method. Then, the fabric was treated with a 3.5% NaOH aqueous solution at a boiling temperature to obtain a fabric having a weight loss rate of 10%.

The cloth for alkali weight reduction treatment
x Black HG-FS (trade name, manufactured by Mitsubishi Kasei Kogyo Co., Ltd.), dyed with 15% owf at 130 ° C. for 60 minutes, and then NaOH 1 g / l and hydrosulfite 1 g /
reduction with an aqueous solution containing 1 at 70 ° C. for 20 minutes,
I got a black-dyed cloth.

The dyed state and texture of the obtained dyed fabric are shown in Table 1.

[0049]

[Table 1]

As is clear from the results of Table 1, when the yarn temperature immediately after the heater exit is less than 70 ° C. (heater temperature is less than 90 ° C.) (Comparative Examples 1 and 2), fluff and dyeing spots are generated,
When the yarn temperature immediately after the heater exit exceeds 100 ° C. (heater temperature exceeds 130 ° C.) (Comparative Examples 1 and 2), the single yarn cross-section is deformed and crimps are imparted. , It has a fluffy texture, inferior bathochromic property, and fluff and dyeing spots occur.

On the other hand, the yarn temperature immediately after the heater exit is 7
In the case of the present invention of 0 to 100 ° C. (heater temperature of 90 to 130 ° C.) (Examples 1 to 3), there is no fluff or dyeing spots, excellent bathochromic properties, and there is no deformation of the cross-sectional shape. A crimp-free cloth having a soft texture with tension and elasticity can be obtained.

[0052]

Examples 4 to 6 and Comparative Examples 4 to 6 Stretching temporary drawing was performed in the same manner as in Example 2 except that the cutting elongation, birefringence and processing ratio of the polyester unstretched yarn were changed as shown in Table 2. Twisting and evaluation were performed. The cutting elongation and birefringence of the polyester unstretched yarn were changed by changing the spinning speed.

The results are shown in Table 2.

[0054]

[Table 2]

As is clear from the results shown in Table 2, when the difference in cutting elongation is less than 300% and the difference in birefringence is less than 0.06 (Comparative Example 4), a soft texture cannot be obtained and fluff is not obtained. In the case of the present invention (Example 4) in which the difference in cutting elongation is 300% or more and the difference in birefringence is 0.06 or more, although stains are generated, a soft texture with tension and elasticity is obtained. No fluff or stain is generated.

When the processing magnification is less than 1.10 (Comparative Example 5), surging is apt to occur due to insufficient twisting tension, and fluff and dyeing spots are formed. Will be inferior. On the other hand, the processing magnification is 1.
When it exceeds 40 times (Comparative Example 6), fluff,
Not only do many yarn breaks occur, but when made into a fabric, a soft texture cannot be obtained.

On the other hand, the processing magnification is 1.10 to 1.
In the case of the present invention within the range of 40 (Examples 5 and 6),
A fabric with no fluff or stain and having a soft texture with a firm and elastic texture can be obtained.

[0058]

Example 7 and Comparative Example 7 Stretching false twisting and evaluation were performed in the same manner as in Example 2 except that the second heater temperature was changed as shown in Table 3.

The results are shown in Table 3.

[0060]

[Table 3]

When the heat treatment temperature by the second heater after the drawing false twisting process is less than 150 ° C. (Comparative Example 7), the boiling water shrinkage ratio exceeds 15%, and whitish dyeing unevenness is exhibited, which is the desired deep dyeing property. However, in the case of the present invention where the heat treatment temperature exceeds 150 ° C. (Example 7), there is no uneven dyeing and a deep dyeing and soft texture can be obtained.

[0062]

EFFECTS OF THE INVENTION According to the method of the present invention, a cloth having excellent bathochromism, no cross-sectional shape deformation, substantially no crimping, and a soft texture with tension and elasticity. It is possible to produce a deep dyeing special mixed yarn which can be

The fabric prepared by using the mixed yarn produced by the method of the present invention can be dyed in an extremely dark color and stretched,
It has a peculiar texture that is completely different from conventional polyester fiber fabrics, such as being flexible, smooth and flexible, and is suitable for use in high-end clothing fields such as black formal, innerwear, and women's party dresses. Suitable for

[Brief description of drawings]

FIG. 1 is a schematic front view showing an example of an apparatus for carrying out the method of the present invention.

FIG. 2 is an enlarged schematic diagram showing a difference in crimped state between a textured yarn (a) produced by a conventional method and a mixed fiber (b) produced by the method of the present invention.

[Explanation of symbols]

1 Polyester undrawn yarn with low cutting elongation and high birefringence 2 Polyester undrawn yarn with high cutting elongation and low birefringence 3 Synthetic yarn snell guide 4 Tension adjusting device 5 Supply roller 5'Supply roller 6 Air Entangling nozzle 7 Intermediate roller 7'Intermediate roller 8 First heater 9 False twisting tool 10 Delivery roller 10 'Delivery roller 11 Second heater 12 Take-up roller 12' Take-up roller 13 Winder 14 Cheese

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area D02G 3/04

Claims (3)

[Claims] 1. A plurality of unstretched polyester yarns having a breaking elongation difference of 300% or more and a birefringence difference of 0.06 or more are aligned and subjected to an entanglement treatment, and then a processing magnification of 1.10 to 1.
At 40, heating is performed so that the yarn temperature immediately after the heater exit is 70 to 100 ° C., and a false false twisting process is performed.
A method for producing a deep-dyeing special mixed fiber, which comprises heat-treating at 0 ° C or higher. 2. The heating at the time of drawing false twisting is performed with a heater temperature of 9.
The method for producing a deep-dyeing special mixed fiber according to claim 1, which is carried out at 0 to 130 ° C for a heating time of 0.15 to 0.23 seconds. 3. The polyester undrawn yarn having a lower breaking elongation and a higher birefringence has a breaking elongation of 50 to 100% and a birefringence of 0.07 to 0.13. 2. The method for producing a deep-dyeing special mixed yarn according to 2.