KR101979655B1 - The method for preparation of false-twisted yarn using polyester latent crimp yarn and false-twisted yarn therefrom - Google Patents

Abstract

A method for manufacturing a false-twisted yarn using a polyester-based latent-crimp yarn and the false-twisted yarn using the polyester-based latent-crimp yarn manufactured by the same of the present invention has uniform and excellent elastic properties compared to an existing latent-crimp developing fiber in fabric and knitting, and at the same time, has excellent texture, softness, body feel, and drape properties.

Description

Method for preparing composite twisted yarn using polyester latent weft yarn and composite twisted yarn using polyester latent twisted yarn manufactured by this method {The method for preparation of false-twisted yarn using polyester latent crimp yarn and false-twisted yarn therefrom}

The present invention relates to a composite twisted yarn manufacturing method using a polyester-based latent yarn, and to a composite twisted yarn using a polyester-based latent yarn, which is produced through the same, and more particularly, at the same time it exhibits high elasticity in textiles and knitted fabrics. The present invention relates to a composite twisted yarn production method using a polyester-based latent yarn having a tactile feel and drape, and a composite twisted yarn using a polyester-based latent wound yarn manufactured therefrom.

Synthetic fibers have a shorter history than natural fibers, but with repeated technological developments, they have reached levels comparable to natural fibers in some characteristics. In recent years, the spandex market characterized by elasticity has grown steadily as the demand for fabrics requiring elasticity and materials for differentiated fabrics different from existing touches has increased. However, in the case of spandex, there is a problem in alkali resistance, there is a problem in form stability, etc., and the spandex yarn alone cannot be used alone, and a separate covering process is required. Therefore, there is a limit to the market demand for increasingly thin fabrics because there is no choice but to obtain a relatively thick fabric.

In order to overcome the shortcomings of spandex, an elastic latent crimp fiber produced by a method of expressing a crimp due to a heat shrinkage difference imparted when fabric is manufactured by complex spinning a polymer having different heat shrinkage properties in a side-by-side manner has been proposed. .

The latent crimped fiber is composed of two types of polymers with different thermal contraction characteristics in a side-by-side type or a sheath-core type, and then thermally contracted by applying heat in a spinning or stretching process. It is a fiber that gives a high degree of elasticity in a principle similar to a spring by physically giving a coil shape due to the difference in sex. Although it does not reach the existing spandex fiber in terms of elasticity, it is a disadvantage of the above-mentioned spandex fiber, which has excellent alkali resistance and morphological stability, and uses a lot of latent crimped fibers that are easy to dye and post-process.

Regarding the method for producing such latent crimped fibers, Japanese Patent Laid-Open Publication No. 1997-209217 and Japanese Patent Laid-Open Publication No. 1991-161519 disclose a method using two kinds of polyethylene terephthalate (PET) having extreme viscosity difference and high shrinkage copolymerization. BACKGROUND OF THE INVENTION Methods for producing polyester-based latent crimpable fibers using polyethylene terephthalate (PET) are known. However, there was a problem in that the above-described method could not make a product having elasticity and touch and drape at the same time.

The present invention has been made to solve the above-mentioned problems, the method of producing a composite twisted yarn using a polyester-based latent yarn that has a good stretch, softness, body and drape while at the same time expressing high elasticity in fabrics and knitted fabrics; It is an object to provide a composite twisted yarn using the polyester-based latent wound yarn produced through this.

MEANS TO SOLVE THE PROBLEM In order to solve the above-mentioned subject, this invention is the polyester latent which contains a polyethylene terephthalate (PET) component and a polybutylene terephthalate (PBT) component in the manufacturing method of the composite twisted yarn using polyester type latent crimping yarn. After supplying the crimped yarn to the first feed roller, it passes through the first heater and burns it at a firing ratio of 1.5 to 2.5 with a disk type combustor, and passes through the second feed roller at a draw ratio of 1.5 to 2.0 to simultaneously perform drawing and burning. And, thereafter provides a composite twisted yarn manufacturing method using a polyester-based latent yarn, characterized in that the composite twisted yarn is manufactured by passing through a third feed roller.

According to a preferred embodiment of the present invention, the second overfeed rate between the second feed roller and the third feed roller may be 0.30 ~ 0.48%.

According to another preferred embodiment of the present invention, the first heater includes a first heater zone and a second heater zone, the length of the first heater zone being greater than the length of the second heater zone. Short, the first heater zone has a temperature of 300 ~ 500 ℃, the temperature of the second heater zone is 200 ~ 350 ℃, the temperature of the first heater zone may be higher than the temperature of the second heater zone.

According to another preferred embodiment of the present invention, the ratio of the tension (T ₁ ) before passing through the disk type combustor and the tension (T ₂ ) after passing through the disk type combustor may satisfy Equation 1 below.

[Equation 1]

0.4 ≤ T ₂ / T ₁ ≤ 0.8

According to another preferred embodiment of the present invention, the single yarn fineness of the polyester-based latent wound yarn is 0.05 ~ 30de ', the single yarn fineness of the composite twisted yarn may be 10 ~ 300de'.

According to another preferred embodiment of the present invention, the polyester-based latent wound yarn may satisfy all of the following conditions a) to c).

a) Crimping rate: 5 ~ 25%

b) elongation: 10 ~ 50%

c) Strength: 1.5 ~ 6.0g / de '

According to another preferred embodiment of the present invention, the polyester-based latent yarn may have a side-by-side, circular or hollow cross section.

According to another preferred embodiment of the present invention, the polyethylene terephthalate (PET) component and the polybutylene terephthalate (PBT) component is included in the polyester-based latent yarn in a ratio of 6: 4 ~ 8: 2 Can be.

Furthermore, the present invention provides a composite twisted yarn using a polyester-based latent yarn, which is manufactured by any one of the above methods, and satisfies all of the following conditions a) to d).

a) Strength: 2.0 ~ 5.0g / de '

b) Elongation: 15 ~ 30%

c) non-shrinkage rate: 3.0 ~ 10.01%

Composite twisted yarn manufacturing method using the polyester-based latent yarn of the present invention and composite twisted yarn using the polyester-based latent yarn is produced by the present invention has a uniform and excellent elastic properties than the conventional latent crimp-type fibers in fabrics and knitted fabrics At the same time, it has excellent touch, softness, body feel and drape.

1 is a schematic diagram of a composite twisted yarn processing process using a polyester-based latent yarn in accordance with a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail.

As described above, the composite twisted yarn using the polyester-based latent crimping yarn has a problem that it is difficult to satisfy touch and drape while having high elasticity in woven fabrics and knitted fabrics. In addition, the manufacturing process of the composite twisted yarn using the conventional polyester-based latent yarn is designed to be suitable for the latent wound yarn containing a PET component having a different intrinsic viscosity or a latent wound yarn containing a PET and PTT as a heterogeneous component. There was a problem that it is not suitable as a combustible process for latent crimping houses containing PBT as a heterogeneous component.

Therefore, the present invention is a composite twisted yarn manufacturing method using a polyester-based latent yarn, using a polyester-based latent yarn comprising a polyethylene terephthalate (PET) component and a polybutylene terephthalate (PBT) component After supplying to the first feed roller, the first heater is passed through the flame retardant ratio of 1.5 ~ 2.5 by the disk type combustor, and then passed through the second feed roller at the stretching ratio 1.5 ~ 2.0 to perform the stretching and burning at the same time, Thereafter, the composite feed twisted yarn was manufactured by passing through a third feed roller, and the composite twisted yarn was manufactured. Through this, the composite twisted yarn using the polyester-based latent yarn of the present invention has excellent uniformity and excellent stretch characteristics in fabrics and knitted fabrics, and is excellent in touch, softness, body feel and drape.

First, the polyester-based latent yarn used as the yarn of the present invention includes a polyethylene terephthalate (PET) component and a polybutylene terephthalate (PBT) component. In this case, preferably, the polyethylene terephthalate (PET) component may be included more than the polybutylene terephthalate (PBT) component, and more preferably the polyethylene terephthalate (PET) component and the polybutylene terephthalate (PBT) component. It may be included in the weight percent of 60:40 ~ 80:20, more preferably in the weight percent of 65:35 ~ 75:25, most preferably in the weight percent of 70:30.

In the case where the polyethylene terephthalate (PET) component and the polybutylene terephthalate (PBT) component included in the polyester latent crimping yarn of the present invention are included in the weight ratio range, as described later, the difference in the heat shrinkage characteristic of each polymer By physically expressing the coil-shaped crimp (Crimp) it can achieve the desired high elasticity in the principle similar to the spring. In addition, there is an advantage that the stretching and burning process according to the present invention can be performed more smoothly. If polyethylene terephthalate (PET) component is included in the above range, the problem of elastic recovery and dyeing may be reduced, and polybutylene terephthalate (PBT) component is included in the above range. There may be a problem that the flexibility and the touch is degraded.

In addition, the polyester-based latent crimping yarn of the present invention may have a side-by-side type, circular or hollow cross section.

On the other hand, according to the preferred embodiment of the present invention as described above, the polyester-based latent crimping yarn may include more polyethylene terephthalate (PET) component than polybutylene terephthalate (PBT) component . Accordingly, the side-by-side, circular or hollow cross section of the polyester-based latent crimp of the present invention may appear unevenly.

In addition, the polyester-based latent crimping yarn of the present invention may be spun under the conditions of the composite radiation angle 45 ~ 90 °, discharge pressure 150 ~ 200kg / cm ² . In addition, the spinning speed is preferably 3,000 ~ 6,000mpm (m / min). By spinning under the above conditions, it is possible to further improve the feel, softness, body feel, and drape in fabrics and knitted fabrics.

On the other hand, according to a preferred embodiment of the present invention, the polyester-based latent wound yarn may satisfy all of the following conditions a) to c).

a) Crimping rate: 5 ~ 25%

b) elongation: 10 ~ 50%

c) Strength: 1.5 ~ 6.0g / de '

Through this, it is possible to express high elasticity and soft feeling through proper crimp expression by utilizing bishrinkage characteristics, and have an appropriate strength. In addition, by using the polyester latent crimping yarn, it is possible to obtain a polyester-based latent crimping yarn having excellent stretch properties, feel, softness and body feel.

Next, the method of manufacturing a composite twisted yarn using the polyester-based latent yarn we will be described in detail.

First, Figure 1 is a schematic diagram of a composite twisted yarn processing process using a polyester-based latent yarn in accordance with a preferred embodiment of the present invention. Referring to FIG. 2, the yarn loaded in the krill 10 is supplied to the first feed roller 20 and passes therethrough.

After passing through the first feed roller 20, the yarn passes through the first heater 30, passes through the cooler 40, and then simultaneously burns to the disc type combustor 50.

According to a preferred embodiment of the present invention, the first heater 30 may include a first heater zone and a second heater zone. In addition, the length of the first heater zone may be shorter than the length of the second heater zone. In this case, the heat treatment may be performed uniformly, and the shrinkage characteristics and the dyeability may be improved. At this time, more preferably, the ratio of the lengths of the first heater zone and the second heater zone may be 1: 1.2 to 10, in which case a polyester-based latent crimping yarn having excellent elasticity and feel, softness, and body feel may be used. You can get it.

In addition, the first heater zone may be a temperature of 300 ~ 500 ℃, the temperature of the second heater zone may be 200 ~ 350 ℃, preferably the temperature of the first heater zone is the temperature of the second heater zone Can be higher. If the temperature of the first heater zone is less than 300 ° C or the temperature of the second heater zone is less than 200 ° C, problems may occur in uniform heat treatment. In addition, when the temperature of the first heater zone exceeds 500 ° C and the temperature of the second heater zone exceeds 350 ° C, problems may occur. In addition, if the temperature of the first heater zone is equal to or lower than the temperature of the second heater zone, a problem of deteriorating shrinkage characteristics and dyeing properties may occur.

The yarn passed through the first heater 30 passes through the cooling plate 40, in which case the temperature of the fiber is preferably such that the temperature of 70 ~ 90 ℃ drop. The yarn is passed through the cooling plate 40, the temperature is lowered, and after passing through the disk-type combustor 50, twisting and decompression proceeds before and after, imparting crimpability to the yarn. At this time, it is possible to burn at a firing ratio of 1.5 to 2.5, preferably at a firing ratio of 1.7 to 2.3, and more preferably at a firing ratio of 1.9 to 2.1. If the firing ratio is out of the above range, it may cause a problem that it is difficult to simultaneously satisfy high stretch characteristics and feel, softness and body feel.

Meanwhile, the firing ratio directly affects the dyeability by directly controlling the tension (T ₂ ) after passing through the combustor. Indirectly, it also affects the tension T ₁ before passing through the combustor. At this time, it is preferable that the ratio of the tension T ₁ before passing through the disc type combustor and the tension T ₂ after passing through the disc type combustor satisfies Equation 1 below.

[Equation 1]

0.4 ≤ T ₂ / T ₁ ≤ 0.8

More preferably, T ₂ / T ₁ may satisfy 0.5 ≦ T ₂ / T ₁ ≦ 0.7. If the ratio of the tension T ₁ before passing through the disc type combustor and the tension T ₂ after passing through the disc type combustor does not satisfy the above range, a problem may occur in that dyeing property is deteriorated or wool occurs.

The yarn passed through the disc type combustor 50 passes through the second feed roller 60. The stretching occurs due to the linear speed difference between the first feed roller 20 and the second feed roller 60, and the yarn is a first heater installed between the first feed roller 20 and the second feed roller 60. Since it passes through (30), drawing and flammable are possible simultaneously.

In addition, the draw ratio is defined as the speed of the second feed roller / the speed of the first feed roller, the draw ratio in the present invention should be 1.5 ~ 2.0. Preferably it may be 1.6 ~ 1.9. If the draw ratio is less than 1.5, the tension may be lowered, resulting in non-uniformity, and if the draw ratio is greater than 2.0, the thread may be broken due to excessive tension.

The yarn passes through the second feed roller 60 and then passes through the third feed roller 80, and a second heater 70 may or may not be installed therebetween. If the yarn passes through the second heater 70 after passing through the second feed roller 60, it is preferable that the temperature of the second heater 70 is maintained at 40 to 70 ° C. without providing the temperature. . If the temperature of the second heater exceeds 180 ℃ may cause a problem that the shrinkage characteristics are lowered.

The yarn passing through the third feed roller 80 may be provided with oil while passing through the oil ring roller 90, and then, the yarn is wound around the winding roller 100.

On the other hand, the first overfeed rate (OF 1) means (speed of the first feed roller-the speed of the second feed roller) / the speed of the first feed roller, the second over feed rate (OF 2) is ( 3 speed of the feed roller-speed of the second feed roller) / speed of the second feed roller, the third overfeed rate (OF 3) is (speed of the winding roller-speed of the third feed roller) / winding roller Means speed.

In the present invention, the first overfeed rate OF 1 may be 1 to 6%, and preferably 1.5 to 5.5%. If the first overfeed rate is less than 1%, the interlace may become less uniform, and if the first overfeed rate is less than 6%, the tension may be reduced to increase thread trimming, such as increasing thread trimming.

According to a preferred embodiment of the present invention, the second overfeed rate OF2 between the second feed roller and the third feed roller may be 0.30 to 0.48%. More preferably, it may be 0.35 to 0.43%. When the second overfeed rate satisfies the above range, the yarn path can be stabilized and the winding tension and the strength can be adjusted. In addition, when the second heater 70 is installed, the shrinkage rate may be adjusted according to the fixed tension by determining the fixed tension in the second heater. If the second overfeed rate does not satisfy the above range, the burnability cannot be stabilized, so that the flammability is significantly lowered, and the desired effect of the present invention is caused, such as causing a yarn defect such as a moor loop. There is a problem that may not manifest.

In addition, in the present invention, the third overfeed rate OF 3 is preferably 0.1 to 0.35%, and more preferably 0.15 to 0.30%. If the third overfeed rate exceeds 0.35%, there is a problem that the desired effect of the present invention may not be exhibited, such as a decrease in tension.

On the other hand, the speed of each feed roller can be appropriately changed and used in the range satisfying the range of the overfeed rate.

Furthermore, the present invention provides a composite twisted yarn using a polyester-based latent yarn, which is manufactured by any one of the above-described methods, and satisfies all of the following conditions a) to d). Through this, the composite twisted yarn using the polyester-based latent yarn of the present invention has excellent uniformity and excellent stretch characteristics in fabrics and knitted fabrics, and is excellent in touch, softness, body feel and drape.

a) Strength: 2.0 ~ 5.0g / de '

b) Elongation: 15 ~ 30%

c) Non-shrinkage rate: 3.0 ~ 10.01%

On the other hand, the single yarn fineness of the polyester-based latent wound yarn of the present invention may be 0.05 ~ 30de ', the single yarn fineness of the composite twisted yarn using the polyester-based latent wound yarn of the present invention may be 10 ~ 300de'. If the single yarn fineness of the composite twisted yarn is less than 10de ', there may be a problem of increasing the wool and loops, and if it exceeds 300de', the texture of the fabric and the circular knitting may occur.

Hereinafter, the present invention will be described in detail by Examples and Experimental Examples. The following Examples and Experimental Examples are only illustrative of the present invention, and the scope of the present invention is not limited to the following Examples and Experimental Examples.

< Example  1>

Composite twisted yarn was manufactured using a polyester-based latent yarn using the same twister as in FIG. 1. The polyester latent crimp yarn used at this time contains PET component and PBT component in a weight ratio of 7: 3, respectively, and the single yarn cross section has a side by side type, single yarn fineness of 2de '(denier), and 36 filament number. A multifilament yarn having a strength of 2.5 g / de ', an elongation of 42%, and a crimping rate of 20% was used. Thereafter, under the conditions as shown in Table 1, the composite twisted yarn using a polyester-based latent yarn was prepared by stretching and burning. The prepared composite twisted yarn had a strength of 3.2 g / de ', an elongation of 26%, a non-shrinkage ratio of 8%, and an int of 88 / m. Thereafter, the composite twisted yarn manufactured was 100%, and then knitted into circular knits, and then knitted.

< Example  2-5>

It was carried out in the same manner as in Example 1 except that manufactured under the same conditions as in Table 1.

< Comparative example  1>

The same procedure as in Example 1 was carried out except that the PTT component was used instead of the PBT component.

< Comparative example  2-5>

It was carried out in the same manner as in Example 1 except that manufactured under the same conditions as in Table 1.

< Experimental Example >

The physical properties as described below were evaluated for the knitted fabrics prepared in Examples and Comparative Examples, and the results are shown in Table 1.

1. Feel (soft)

Sensory tests by 10 experts showed that 8 or more were judged to be soft, and 5 to 7 were judged to be soft, and 5 or less were judged to be soft.

2. Drape

Sensory tests by 10 experts indicate that 8 or more people are draped, and 5 to 7 people are draped. Divided.

3. Evaluation of flammability

The flammability was evaluated by counting the number of thread breaks after the yarn was fed through the krill, which is excellent when the thread break is less than 5 times, usually 5 or more times and less than 15 times, and poor when 15 or more times.

4. Weaving (time)

It was evaluated by the number of stops of the weaving machine due to the cutting generated during the weaving of 1.76m and 91.44m in length.It is excellent when the number of stops is less than one, and when the number of stops is more than one, usually five times or more. If evaluated as poor.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 T1 (g) 48.3 48.3 48.3 48.3 48.3 48.3 48.3 48.3 48.3 48.3 T2 (g) 29.1 29.1 29.1 29.1 29.1 29.1 29.1 29.1 29.1 29.1 OF1 (%) 3.35 3.35 3.35 3.35 3.35 3.35 3.35 3.35 3.35 3.35 OF2 (%) 0.39 0.33 0.45 0.25 0.50 0.39 0.39 0.39 0.39 0.39 OF3 (%) 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 Mortality 1.98 1.8 2.2 1.6 2.4 1.98 1.3 2.8 1.98 1.98 Elongation ratio 1.747 1.55 1.95 1.747 1.747 1.747 1.747 1.3 1.3 2.2 First heater zone temperature (° C) 400 400 400 400 400 400 400 400 400 400 Second heater zone temperature (° C) 275 275 275 275 275 275 275 275 275 275 1st heater zone: 2nd heater zone length ratio 1: 2 1: 2 1: 2 1: 2 1: 2 1: 2 1: 2 1: 2 1: 2 1: 2 touch Great usually usually usually usually usually Bad usually usually Bad Drape Castle Great Great Great usually usually usually usually Bad usually Bad Combustible Machinability Great usually Great usually usually Bad Bad Bad Bad usually Weaving Great usually usually usually usually Bad Bad Bad Bad usually

As can be seen from Table 1, Example 1 was found to be superior in touch, elongation and weaving at the same time compared to the case where the firing ratio is less than 1.5 (Comparative Example 2) or more than 2.5 (Comparative Example 3). In addition, it can be seen that Example 1 is more easily combustible and weavable than Comparative Example 1 using PPT instead of PBT, which is a component of latent crimping yarn, so that the process can be performed more easily. Further, it can be seen that Example 1, which satisfies this in comparison with Examples 4 to 5 outside the range of OF2, exhibits excellent physical properties and can be performed smoothly.

10: krill 20: first feed roller
30: first heater 40: cooling plate
50: disc type combustor 60: second feed roller
70: second heater 80: third feed roller
90: oiling roller 100: winding roller

Claims (6)

In the composite twisted yarn manufacturing method using a polyester-based latent yarn,
After supplying the yarn of the polyester-based latent yarn containing a polyethylene terephthalate (PET) component and a polybutylene terephthalate (PBT) component in a weight ratio of 6: 4-8: 2 to the first feed roller, The first heater including the heater zone and the second heater zone is passed, and the disc type combustor is used to burn at a firing ratio of 1.5 to 2.5, and the second feed roller is passed at a draw ratio of 1.5 to 2.0 to draw and burn. Are carried out at the same time, and then the composite twisted yarn is manufactured by passing the yarn through a third feed roller,
The second overfeed rate between the second feed roller and the third feed roller is 0.35 to 0.43%,
The length of the first heater zone is shorter than the length of the second heater zone,
The temperature of the first heater zone is 300 ~ 400 ℃, the temperature of the second heater zone is 200 ~ 275 ℃ characterized in that the composite twisted yarn production method using a polyester-based latent yarn.
delete delete The method of claim 1,
Manufacture of composite twisted yarn using a polyester-based latent yarn, characterized in that the ratio of the tension (T ₁ ) before the disk type combustor passes and the tension (T ₂ ) after the disk type combustor passes satisfies Equation 1 below. Way.
[Equation 1]
0.4 ≤ T ₂ / T ₁ ≤ 0.8 The method of claim 1,
The single yarn fineness of the polyester-based latent yarn is 0.05 ~ 30de ', the single yarn fineness of the composite twisted yarn is 10 ~ 300de',
The single yarn cross section of the polyester-based latent yarn is a side-by-side type, circular or hollow cross section, characterized in that the composite twisted yarn production method using a polyester-based latent yarn. A composite twisted yarn using a polyester-based latent yarn, which is prepared by the method of any one of claims 1, 4 and 5, and satisfies all of the following conditions a) to c).
a) Strength: 2.0 ~ 5.0g / de '
b) Elongation: 15 ~ 30%
c) Non-shrinkage rate: 3.0 ~ 10.01%

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