JPH06264362A - Production of woven or knit fabric using false twist yarn of water absorbing polyester - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a method for producing a woven or knitted fabric using a polyester false twisted yarn, which has a cotton-like texture and exhibits substantially permanent and excellent water absorption. A side-by-side type composite hollow cross section yarn comprising a polyester (component A) substantially containing polyethylene terephthalate of 95% by weight or more and substantially composed of polyethylene terephthalate (component A) and a modified polyester (component B) having a higher alkali reduction rate than the component A. , Uster U% (medium cycle) is 1% or less, and the frequency of the yarn unevenness wavelength being 30 cm or less and the frequency of 45% or more is false twisted to form a woven or knitted fabric, and the weight reduction rate is 3% or more and 45% or less. Method for manufacturing woven and knitted fabrics using water-absorbent polyester false twist yarns that undergo alkali weight reduction treatment with.

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 false twisted yarns for polyester knitted fabrics which have a cotton-like feel and exhibit substantially permanent and excellent water absorption.

[0002]

Polyester fibers have various excellent properties and are used in a wide variety of applications. However, since it is hydrophobic, its use is extremely limited in applications requiring water absorption and hygroscopicity. The following method is known as a method of imparting water absorption for the purpose of solving the problem. (1) A method of specializing the cross section of a single fiber and utilizing the capillary phenomenon between the single fibers. (2) A method of preparing a fiber containing a hydrophilized material. (3) A method in which the cross section of a single fiber is hollow and fine pores reaching the hollow portion from the fiber surface are formed.

[0003]

[Problems to be Solved by the Invention]

In (1), for example, a proposal is made that the cross section of a single fiber is L-shaped, but the aggregated state of fibers greatly affects the performance and is unstable. (2) is a proposal to add polyoxyalkylene glycol, for example, but it reduces the yarn strength / elongation, dyeing fastness and heat resistance. In the case of (3), water and sweat are trapped in the hollow part and the quick-drying property is lost. There was a problem such as. The present invention provides a method for producing a woven or knitted product using a polyester false-twisted yarn that solves the above problem and exhibits substantially permanent and excellent water absorption.

[0004]

DISCLOSURE OF THE INVENTION The gist of the present invention resides in that a polyester (component A) substantially consisting of polyethylene terephthalate containing 95% by weight or more of polyethylene terephthalate and a modifier having a higher alkali weight loss rate than the component A are used. Side-by-side composite hollow cross-section yarn made of polyester (component B), Uster U% (medium cycle)
Is 1% or less, and the frequency of being 30 cm or less of the yarn unevenness wavelength is 45% or more, is false twisted,
A method for producing a woven or knitted fabric using a water-absorbent polyester false-twisted yarn, which comprises subjecting the woven or knitted fabric to alkali reduction treatment at a weight loss rate of 3% or more and 45% or less.

The first characteristic of the supply yarn used in the present invention is that it is a polyethylene terephthalate having latent water absorbency, and preferably from substantially polyethylene terephthalate containing 95% by weight or more of polyethylene terephthalate. 0.1% of a polyester component A and a polyalkylene glycol having an average molecular weight of 5,000 or more.
Side-by-side type composite hollow cross-section yarn (10% by weight and a polyester component B whose main repeating unit is ethylene terephthalate, containing 0.05 to 5% by weight of an organic sulfonic acid metal salt represented by the following general formula [1] ( Hereinafter, it will be described as a specific polymer component composite hollow fiber) to obtain a polyethylene terephthalate having appropriate latent water absorbency. _{R-SO 3 M [1]} ( wherein, R represents an alkyl group having 3 to 30 carbon atoms, M represents an alkali metal)

The reason why the hollow fiber is a specific polymer component composite hollow fiber is to prevent the decrease in the strength and elongation of the yarn after alkali reduction, which will be described in detail later. That is, since the component B having a high alkali weight loss rate consumes alkali relatively selectively, the component A can minimize the decrease from the original strength and elongation.

The reason for the hollow cross section yarn is that the texture of the textile made of the hollow cross section yarn is similar to cotton. This is a very important factor when industrializing the present invention. That is, the widespread use of cotton products means that consumers prefer the texture of cotton, and in industrializing the present invention, it is possible to express a sensitivity as important as the water absorbing function of the present invention. Because you can. The hollow ratio at this time, that is, the ratio of the cross-sectional area of the hollow portion to the apparent fiber cross-sectional area is 10
% To 30%, the object is sufficiently achieved.

The second characteristic of the characteristics of the supplied yarn is the multifilament yarn in which the large diameter portion (chic portion) of the single fiber is frequently present and is not unevenly distributed. As such characteristics, (1) as an index showing the existence frequency of the thick portion, the frequency of being 30 cm or less of the yarn unevenness wavelength is 45% or more, preferably 65% or more, and (2) the thick portion is not unevenly distributed. Worcester U% (medium cycle) is 1% as an index
It is necessary to satisfy the following at the same time.

The relationship between the yarn wavelength and the frequency is as shown in FIG.
According to the measurement method described in the instruction manual of KET802 type yarn spot tester manufactured by Keisokuki Kogyo Co., Ltd., Mat. speed: 20
0 m / min, Range: +/- 12.5%, Mode:
The total area of the spectrogram measured by Normal is S
The area of the spectrogram with a wavelength of 30 cm or less is set to ₀ and S ₁
Is expressed as (S ₁ / S ₀ ) × 100% (hereinafter referred to as K value). Worcester U% (medium cycle) is according to the measurement method described in the KET802 type yarn spot tester instruction manual manufactured by Keisokuki Kogyo Co., Ltd. speed: 15
m / min, Range: ± 12.5%, Mode: Har
It is a value measured by finart.

[0010] In addition, S ₁ since the presence of the yarn unevenness of the wavelength of less than meter is not substantially observed even if the normal drawn yarn that does not exist in the chic part is there is a yarn unevenness of the wavelength of more than a few meters
Is considered to be mainly due to the presence of the chic part. The K value of an ordinary drawn yarn is at most 30%, and K ≧ 45% when a sick portion is formed under a specific drawn condition. The yarn having such a K value may have uneven distribution of chic portions between single fibers (for example, Japanese Patent Publication No. 63-17933), but in this case, Uster U% (medium cycle) is 1%. Will be exceeded. In other words, the supply yarn used in the present invention generally has a chic portion in an arbitrary cross section of the raw yarn, and has a very small variation (thickness variation) in the sum of the single fiber areas constituting the arbitrary cross section. .

The raw yarn having such a characteristic is an undrawn yarn obtained by spinning component A and component B using, for example, the side-by-side type composite hollow spinneret shown in FIG. 2 so that the hollow ratio is 10 to 30%. The unstretched yarn is wound several times between a pair of rollers around a heat roller having a glass transition temperature or lower than the crystallization temperature of the unstretched yarn, and stretched at a ratio such that the residual breaking elongation after stretching is 70 to 90%. Can be obtained at.

The yarn 1 thus obtained is as shown in FIG.
Feed roller 2, first heater 3, spindle 4, first
False twisting yarns 9 and 10 are formed by a false twisting device including a delivery roller 5, a second heater 6, a second delivery roller 7, and a winder 8. At this time, what is important is to keep the hollow structure of the yarn as much as possible. As a result, the feeling of cotton, which is the sensitive element of the present invention, is maintained. If the cross-sectional deformation becomes large, the texture becomes rough and hard, which is not preferable. The optimum temperature of the first heater 3 that most affects the cross-sectional deformation is 17
If the temperature is 0 ° C or lower, preferably 150 ° C or lower, the cross-sectional deformation does not substantially occur.

Further, it is appropriate that the draw ratio during false twisting is 1.08 ± 0.02 times with a twisting tension of about 0.12 g / d, which can be imagined from the size of the residual breaking elongation of the raw yarn. It is smaller than the stretching ratio. This is as mentioned above
The supply yarn used in the present invention does not have uneven distribution of chic portions between single fibers, and generally has chic portions in any cross section of the original yarn [in other words, a portion having a small single fiber diameter (thin portion).
Unevenness is not unevenly distributed, and there is a thin part in any cross section of the raw yarn.], Reflecting that the variation in the sum of the single fiber areas (thickness unevenness) forming any cross section is extremely small. Because they are doing it.

The behavior of the thick portion during false twisting is that the thick portion has a higher elongation than the thin portion, so it is stretched by twisting stress, heat set by the first heater 3, and untwisted. It becomes the twisted yarn 9. Alternatively, the false-twisted yarn 10 is stabilized by the second heater 6 if necessary. The false-twisted yarn obtained is the fourth
As shown in the figure as a model, the false twisted yarns 9 and 10 have a large number of talumi 11 and loops 12 around them. When this false twisted yarn is used as a tubular knitted fabric and dyed with a disperse dye under boiling water, the tarmi and loop are deeply dyed.

The false-twisted yarn having such a property is formed into a woven or knitted material by a usual high-order processing method, scoured, heat-fixed, and alkali-reduced to impart water absorbency.

The heat setting at this time is carried out by reducing the amount of alkali, preventing the generation of wrinkles at the time of dyeing, and reducing the crimp rate of the false-twisted yarn at the time of dyeing so that the water content rate of the dyed finished cloth (wearing clothes The first thermal resistance of the false twisted yarn is less than the first heater temperature at the time of false twisting in order to prevent the decrease of the measuring device TL01 made by the water absorption method of Larose method, which is considered to measure the index of the amount of sweat absorption of the product, measured by Toyobo Engineering Co., Ltd.) It is preferable that the temperature (measured with a thermal stress measuring device manufactured by Toyo Baldwin Co., Ltd.) is + 50 ° C. or higher. By the way, in the case of specific polymer composite hollow fiber (first heater temperature is 150 ° C)
The contraction thermal stress was about 60 ° C.

Alkali weight loss treatment is carried out by a generally practiced method, and sufficient water absorption can be obtained by setting the weight loss rate to 3% or more and 45% or less. A feature of the present invention is that sufficient water absorption can be obtained even when the alkali weight loss rate is extremely low (near 5%). Generally, the alkali reduction causes damage to the single fiber, and the physical properties such as tear strength of the woven or knitted fabric are reduced, but the present invention is also advantageous in this respect.

The reason for this is considered to be the false twisted yarn structure in which a large number of talumi 11 and loops 12 having a coarse fiber internal structure are present. That is, the talmi and loop (corresponding to the thick portion) in which the fiber internal structure existing around the false-twisted yarn is rough
The alkali weight loss is more likely to proceed than in the syn-part, and the ingredient B content is particularly likely to be reduced, the alkali in the alkali bath is consumed in a short time, and the water absorption effect is produced by the mechanism described below. On the other hand, in the chic portion having a slow weight reduction speed, the progress of weight reduction is reduced, and the above-mentioned deterioration of physical performance is significantly prevented. Therefore, it is possible to obtain a woven or knitted fabric having high water absorption and preventing deterioration of physical performance. It is also considered that the yarn structure in which single fibers having high water absorption performance exist around the false-twisted yarn is also a major factor in obtaining high water absorption.

Further, the relationship between the alkali weight loss behavior and the water absorption will be described in detail. As shown in a model in FIG. 5, when the weight loss rate of the component B is around 5%, a linear groove is formed substantially along the fiber axis. 13 is generated, and in the vicinity of 10% to 30%, in addition to the groove 13, the hole 14 partially penetrates the hollow portion, and 45%.
In the vicinity, in addition to the groove 13 and the partial hole 14, a portion 15 lacking in melting is found. When exceeding 50%, the lacking portion 1
5 is remarkably large.

When the weight loss rate of component A is around 5%, there is no change in appearance, and when it is around 10 to 30%, the oval weight loss marks found in ordinary alkali weight loss products are recognized, and at 45%.
In the vicinity, cracks 16 are partially formed almost at right angles to the fiber axis, and when it exceeds 45%, many cracks 16 that have remarkably grown are recognized.

These are the results obtained by dyeing the knitted fabric after the weight reduction with a disperse dye under boiling water, sampling the deep-dyed monofilaments protruding on the knitted fabric, and observing them with a scanning electron microscope. Water absorption is not observed without weight reduction treatment, and extremely effective water absorption is shown when the weight reduction rate is 3% or more and 45% or less.
It is considered that the capillary phenomenon due to the formation of the linear grooves 13 is dominant in the improvement of water absorption. On the other hand, the burst strength of the knitted fabric gradually decreases until the alkali weight loss rate is around 45%,
When it exceeds about 45%, it drops sharply. Therefore, industrially, it is necessary to keep the alkali weight loss rate at 45% or less in terms of quality control.

Examples will be described below.

【Example】

Example 1 Polyethylene terephthalate having an intrinsic viscosity [η] = 0.65 containing 0.5% by weight of titanium oxide was used as a component A, and a polyethylene glycol 3 having a molecular weight of 20,000 was used.
Polyester containing 4 mol% of sodium alkylsulfonate and 4 mol% of alkyl sulfonate as component B, and outline 3 shown in FIG.
mm by using a side-by-side type composite hollow spinneret having 30 spinning holes with a slit width of 0.1 mm and a spinning temperature of 29.
0 ° C, winding speed 1800 m / min, hollow rate 20
%, And a fineness of 160d was obtained. The glass transition temperature of this undrawn yarn measured by the tiratometry method is 70.
C., and the crystallization temperature measured by a scanning calorimeter was 127.degree. The undrawn yarn was drawn at a draw ratio of 1.550 times, a heat roller surface temperature of 110 ° C., and a yarn speed of 550 m / min. The obtained raw yarn has a fineness of 104d, a breaking elongation of 84%, and Worcester U.
% (Medium cycle) was 0.85% and K value was 65%. This raw yarn was used as a feed yarn and was false twisted by the Mitsubishi Heavy Industries false twisting machine LS6 type under the following conditions. First delivery peripheral speed 100 m / min, twisting number 2800 T / m, first heater temperature 150 ° C., second heater temperature room temperature, draw ratio 1.08 times. This false-twisted yarn was used as a tubular knitted fabric, scoured, heat-treated for 2 minutes at 120 ° C. dry heat, and a caustic soda concentration of 5 g / l to 3 under boiling water with a bath ratio of 1:50.
The amount was changed to 0 g / l to obtain samples of each weight loss rate. Table 1 shows the results of measuring the water drop disappearance time and burst strength of this sample by the JIS-L1018A method. This result shows that extremely effective water absorption is obtained in the range of the weight loss rate of 3% to 45%, and that the water absorption rate and the burst strength sharply decrease when the weight loss rate exceeds 45%.

[0023]

[Table 1]

[Comparative Example 1] The surface temperature of the heat roller is 65 ° C.
A raw yarn was obtained under the same conditions as in Example 1 except that. This yarn had a fineness of 105d, an elongation at break of 87%, a Uster U% (medium cycle) of 1.54%, and a K value of 75%. The false twist conditions were the same as in Example 1 except that the draw ratio was 1.15 times. Subsequently, knitted fabric was made under the same knitting conditions as in Example 1,
The weight loss rate was changed and the water droplet disappearance time was measured. The results are shown in Table 2.
However, the measured values have large variations.
It is presumed that the reason for this is that the yarn of this comparative example has a structure in which the thick portion is unevenly distributed.

[0025]

[Table 2]

[Embodiment 2] The raw yarn of Embodiment 1 is rotated at a spindle speed of 60 with a double twister # 302 manufactured by Murata Machinery.
A twist number of 200 T / m-Z was obtained at 00 rpm, and a plain woven fabric having a density before weight reduction of 96 warps / inch and 74 wefts / inch was obtained. The weight loss rate of this woven fabric was changed, and the water drop disappearing time and tear strength were measured. The results are shown in Table 3, and the weight loss rate is 5%.
Shows extremely effective water absorption in the range of ~ 45%, 46%
When it exceeded, the water absorbency and burst strength dropped sharply.

[0027]

[Table 3]

[0028]

EFFECTS OF THE INVENTION According to the present invention, it is possible to impart substantially permanent excellent water absorption to a polyester woven or knitted fabric which is originally hydrophobic, and to greatly improve the field of use thereof and the practical seasonability of clothing.

[Brief description of drawings]

FIG. 1 is one of the results obtained by measuring the yarn of the present invention with a yarn spot measuring machine.
It is a raw yarn characteristic diagram which shows an example.

FIG. 2 is a sectional view of a spinneret spinneret for obtaining a side-by-side composite hollow fiber of the present invention.

FIG. 3 is a cross-sectional view of an apparatus for false twisting a raw yarn of the present invention.

FIG. 4 is a structural diagram showing an example of false-twisted yarn obtained by the present invention.

FIG. 5 is a schematic view showing a typical example of a single fiber surface state after alkali reduction of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw yarn 2 Feed roller 3 1st heater 4 Spindle 5 1st delivery roller 6 2nd heater 7 2nd delivery roller 8 Winder 9,10 False twisted yarn 11 Loop 12 Talumi 13 Streaky groove 14 Penetrating into hollow part Hole 15 lack of hollow 16 crack

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[Procedure amendment]

[Submission date] June 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a false-twisted yarn for polyester woven or knitted fabric, which has a cotton-like texture and exhibits substantially permanent and excellent water absorption.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

The first characteristic of the supply yarn used in the present invention is that it is a polyethylene terephthalate having latent water absorbency, and preferably from substantially polyethylene terephthalate containing 95% by weight or more of polyethylene terephthalate. 0.1% of a polyester component A and a polyalkylene glycol having an average molecular weight of 5,000 or more.
Side-by-side type composite hollow cross-section yarn (10% by weight and a polyester component B whose main repeating unit is ethylene terephthalate, containing 0.05 to 5% by weight of an organic sulfonic acid metal salt represented by the following general formula [1] ( Hereinafter, it will be described as a specific polymer component composite hollow fiber) to obtain a polyethylene terephthalate having an appropriate latent water absorption performance. _{R-SO 3 M [1]} ( wherein, R represents an alkyl group having 3 to 30 carbon atoms, M represents an alkali metal)

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Examples will be described below.

Example 1 Polyethylene terephthalate containing 0.5% by weight of titanium oxide and having an intrinsic viscosity [η] = 0.65 as a component A and a molecular weight of 20,000 polyethylene glycol 3
Polyester containing 4 mol% of sodium alkylsulfonate and 4 mol% of alkyl sulfonate as component B, and outline 3 shown in FIG.
mm by using a side-by-side type composite hollow spinneret having 30 spinning holes with a slit width of 0.1 mm and a spinning temperature of 29.
0 ° C, winding speed 1800 m / min, hollow rate 20
%, And a fineness of 160d was obtained. The glass transition temperature of this undrawn yarn measured by the tiratometry method is 70.
C., and the crystallization temperature measured by a scanning calorimeter was 127.degree. The undrawn yarn was drawn at a draw ratio of 1.550 times, a heat roller surface temperature of 110 ° C., and a yarn speed of 550 m / min. The obtained raw yarn has a fineness of 104d, a breaking elongation of 84%, and Worcester U.
% (Medium cycle) was 0.85% and K value was 65%. This raw yarn was used as a feed yarn and was false twisted by the Mitsubishi Heavy Industries false twisting machine LS6 type under the following conditions. First delivery peripheral speed 100 m / min, twisting number 2800 T / m, first heater temperature 150 ° C., second heater temperature room temperature, draw ratio 1.08 times. This false-twisted yarn was used as a tubular knitted fabric, scoured, heat-treated for 2 minutes at 120 ° C. dry heat, and a caustic soda concentration of 5 g / l to 3 under boiling water with a bath ratio of 1:50.
The amount was changed to 0 g / l to obtain samples of each weight loss rate. Table 1 shows the results of measuring the water drop disappearance time and burst strength of this sample by the JIS-L1096A method. This result shows that extremely effective water absorption is obtained in the range of the weight loss rate of 3% to 45%, and that the water absorption rate and the burst strength sharply decrease when the weight loss rate exceeds 45%.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location D03D 15/00 D 7199-3B B 7199-3B // D06M 101: 32

Claims (2)

[Claims] 1. A polyester (component A) consisting essentially of polyethylene terephthalate containing 95% by weight or more of polyethylene terephthalate and an alkali weight loss rate of A.
It is a side-by-side type composite hollow cross section yarn composed of a modified polyester (component B) higher than the component, and Uster U%
Multifilament yarn having a (medium cycle) of 1% or less and a frequency of 30 cm or less of the yarn unevenness frequency of 45% or more is false twisted into a woven or knitted fabric, and an alkali weight reduction treatment is performed at a weight reduction rate of 3% or more and 45% or less. A method for producing a woven or knitted fabric using a water-absorbent polyester false twisted yarn. 2. A polyester consisting essentially of polyethylene terephthalate containing 95% by weight or more of polyethylene terephthalate is used as the A component, and 0.1 to 10% by weight of polyalkylene glycol having an average molecular weight of 5000 or more is used as the B component. The woven fabric using the water-absorbent polyester false twist yarn according to claim 1, wherein a modified polyester containing 0.05 to 5% by weight of the organic sulfonic acid metal salt represented by the formula [1] and whose main repeating unit is ethylene terephthalate is used. Knitting method. _{R-SO 3 M [1]} ( wherein, R represents an alkyl group having 3 to 30 carbon atoms, M represents an alkali metal)