KR101599109B1 - Polyester false twisted yarn having pre-twisted and post-false twisted properities and using method thereof - Google Patents

Abstract

The polyester false-twist yarn of the present invention not only has a soft feeling and a frizzy feel, which are similar touch senses, but also has high stretchability and stretch recovery properties, and is excellent in refreshing feeling, softness and drape property.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester false twisted yarn having a false twisted property and a polyester false twisted yarn,

The present invention relates to a method for producing a polyester false twist yarn having a post-burning post-burning property and a polyester false twist yarn produced by the method, and more particularly to a polyester false twist yarn having a pre- And to provide a polyester false warp yarn produced by the method.

Polytrimethylene terephthalate (PTT) has a very similar polymerization method and chemical structure to polyethylene terephthalate (PET), but there are many differences in thermal and mechanical properties. PTT has superior elasticity, touch, alkali resistance and dyeability compared to PET or PBT. Especially, since the initial modulus is relatively low as nylon level, it has excellent elastic recovery and soft touch. Especially, in case of composite yarn using polytrimethylene terephthalate (PTT) unstretched filament, it is possible to develop elasticity by only dyeing / processing process without additional process, It is expected that it can be utilized as high-quality clothing with different elasticity and fabric.

Generally, the manufacturing principle of false twist yarn is based on the thermoplastic properties of synthetic fibers. The twist is applied to filament yarn produced after spinning, Twisting and De-

Twisting is performed simultaneously in the combustible device to give the crimp Crimp. The filaments that have been twisted by processing the surface of the yarn produced in this manner are referred to as Draw Textured Yarns (hereinafter referred to as "DTY").

On the other hand, a technique relating to a method of twisting and winding polyester fibers is disclosed in Korean Patent Registration No. 10-0649400. For example, in Korean Patent No. 10-0649400, an air nozzle is installed in the previous stage of the second heater and the second heater in twisting polyester single yarns and ply yarns, And the overfeed rate between the feed rollers provided is set to be smaller than the overfeed rate between the feed roller and the winder provided in the preheater of the second heater to impart interlacing to the false yarn.

In Korean Patent Laid-Open No. 2010-40993, a stretchable shape-memory composite false-twist yarn is made of filament yarn of polytrimethylene terephthalate (PTT) and natural spun yarn and is twisted at a primary 500 to 700 T / M, / PT yarn is placed in the core yarn (1) at the center of the yarn by heat treatment at 130-190 ° C and after the pre-twist after the pre-twisting after the pre-twisting, And the natural spun yarn is surrounded by the effective yarn 2. The fabric made of such a flexible and expressive shape memory composite false twist yarn has elasticity and shape memory property at the same time and has a stretchable expression shape Memory complexity continuous speech is disclosed.

However, the above-described post-pre-fusing process is a very effective method for imparting high stretchability and stretch recovery properties to polyester fibers, but the process cost is too high, so that actual products are not widely used.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of controlling a polyester twist yarn under specific conditions and properties of a false twist yarn produced therefrom, And to provide a polyester false warp yarn produced by the method.

In order to solve the above-described problems, the present invention provides a method for producing a polyester false-twist yarn, comprising the steps of: (1) feeding polyester yarn to a first godet roller; (2) heating the yarn passed through the first godet roller in the first heating section and passing through the cooling section; (3) twisting the yarn passed through the cooling section at twisted portions of 2000 to 4000 T / M; (4) 40 to 70% of the twisted yarns are twisted while the twisted yarn is fed to the second godet roller; And (5) transferring the partly melted yarn to a second heating unit and heating the melted yarn. [5] The present invention also provides a method for producing a polyester false-twist yarn having post-burning flammability characteristics.

According to a preferred embodiment of the present invention, the heating temperature of the first heating unit may be 200 to 240 ° C.

According to another preferred embodiment of the present invention, it is possible to maintain a twist of 800 to 2800 T / M through some of the margins of the step (4).

According to another preferred embodiment of the present invention, the heating temperature of the second heating unit may be 190 to 230 ° C.

According to another preferred embodiment of the present invention, the heating temperature of the first heating unit may be higher than the heating temperature of the second heating unit.

According to another preferred embodiment of the present invention, the total stretch ratio of the polyester twist yarn may be 1.4 to 1.75.

According to another preferred embodiment of the present invention, the polyester may be polyethylene terephthalate (PET).

According to still another preferred embodiment of the present invention, there is provided a polyester false warp yarn having post-warp flammability characteristics satisfying all of the following conditions (1) to (5).

(1) Lysine shrinkage ratio 3 to 10%

(2) the elastic recovery rate is 10 to 25%

(3) the elongation at break is 20 to 35%

(4) The number of fusing water is 20 pieces / M or less

(5) The strength is 3 to 4 G / D.

According to another preferred embodiment of the present invention, the polyester false twist yarn may further satisfy the following condition (6).

(6) Number of kinks after dyeing 800 ~ 2800 T / M

According to another preferred embodiment of the present invention, the polyester false-twist yarn may further satisfy the following conditions (7) and (8).

(7) Monosan islands 2-5 denier

(8) Total fineness 50 to 200 denier

According to another preferred embodiment of the present invention, the polyester false-twist yarn may further satisfy the following condition (9).

(9) Remaining shrinkage ratio 6 to 15%

According to another preferred embodiment of the present invention, the polyester may be polyethylene terephthalate (PET).

According to another preferred embodiment of the present invention, there is provided a knit fabric comprising a polyester false twist yarn of the present invention.

The polyester false-twist yarn of the present invention not only has a soft feeling and a frizzy feel, which are similar touch senses, but also has high stretchability and stretch recovery properties, and is excellent in refreshing feeling, softness and drape property.

1 is a schematic view of a processing process according to a preferred embodiment of the present invention.
2 is a schematic view of a processing process according to another preferred embodiment of the present invention.
3 is an electron micrograph of a polyester false warp yarn according to a preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in more detail with reference to the accompanying drawings.

As described above, the post-woven post-fusing process is a very effective method for imparting high stretchability and stretch recovery properties to polyester fibers, but the process cost is too high, and actual products are difficult to be widely used.

Accordingly, the present invention provides a method for producing a polyester false-twist yarn, comprising the steps of: (1) feeding a polyester yarn to a first godet roller; (2) heating the yarn passed through the first godet roller in the first heating section and passing through the cooling section; (3) twisting the yarn passed through the cooling section at twisted portions of 2000 to 4000 T / M; (4) 40 to 70% of the twisted yarns are twisted while the twisted yarn is fed to the second godet roller; And (5) transferring the partly melted yarn to a second heating unit and heating the melted yarn. [5] The present invention also provides a method for producing a polyester false-twist yarn having post-burning flammability characteristics. The polyester false twist yarn produced by this method has not only a similar touch feeling but also has high stretchability and stretch recovery properties without having undergone a post-baking post-baking process, and is excellent in refreshing feeling, softness and drapeability.

First, as the step (1), the polyester yarn is fed to the first godet roller. The polyester yarn which can be used in the present invention may be a single yarn or a twisted yarn, and the polyester is preferably polyethylene terephthalate (PET), which is advantageous for achieving the object of the present invention. Fig. 1 is a schematic diagram of a processing process according to a preferred embodiment of the present invention, in which a polyester yarn is fed to a first feeding roller 100. Fig. Meanwhile, according to a preferred embodiment of the present invention, the polyester yarn can be supplied by juxtaposing two or more types of yarns. In this case, the polyester yarn may further include a separate second supply roller 200 as shown in FIG.

The raw yarn supplied from the first feeding roller 100 passes through the first heating plate 420 through the first godet roller 320. In this case, the stretching ratio of the fiber can be determined according to the difference between the linear velocity of the first godet roller 320 and the linear velocity of the second godet roller 330 described later. Therefore, preferably, the linear velocity of the first godet roller of the present invention may be 250 to 350 mpm. If the linear velocity of the first godet roller is 250 mpm or less, productivity may be too low. If the linear velocity of the first godet roller is more than 350 mpm, a loop and a loop may occur.

Next, in step (2), the yarn passed through the first godet roller is heated by the first heating section and passed through the cooling plate. Specifically, the yarn passing through the first godet roller 320 passes through the first heating unit 420. In this case, the temperature of the first heating part 420 may preferably be 200 to 240 ° C. If the heating temperature of the first heating part 420 is less than 200 DEG C, there may be a problem that the amount of false leaning is reduced. If the heating temperature is more than 240 DEG C,

The raw yarn that has passed through the first heating part 420 reaches the cooling part 430. In this case, the temperature of the cooling unit 430 may preferably be 30 to 80 ° C. If the heating temperature of the cooling part 430 is less than 30 ° C, a mowing problem may occur due to rapid cooling. If the heating temperature is more than 80 ° C, cooling may be reduced, and a mowing and loop problem may occur.

Next, in step (3), the yarn passed through the cooling section is twisted at a twist portion of 2000-4000 T / M. Specifically, conventional polyester stretchable false-twist yarns generally gave 1500 T / M. However, according to the present invention, a considerable number of twists are added to the twist of the conventional twisted part 500, and then the twisted part is formed in an appropriate range to have a touch feeling similar to the twisted twist. If the twist is out of the above range, it is difficult to achieve the object of the present invention. Preferably, the frictional angle between the cooling plate 430 and the twisted portion 500 and the second godet roller 330 may be 90 to 120 °. If the twist angle is less than 90 degrees, too little trouble may occur. If the twist angle exceeds 120 degrees, a mowing problem may occur.

Next, in step (4), the twisted yarn is transferred to the second godet roller 330, and is subjected to 40 to 70% of the twist in the entire twist. Specifically, the second godet roller 330 not only imparts a stretching ratio to the false twist yarn due to the difference in linear velocity between the first godet roller 320 and the first godet roller 320, but also partially twists the twisted yarn from the false twist portion 500 And a melting process for releasing the melt are simultaneously performed. Specifically, the linear velocity of the second godet roller 330 may be 350 to 612 mpm. If the linear velocity of the first godet roller is less than 350 mpm, productivity may be deteriorated. If the linear velocity exceeds 612 mpm, a mowing problem may occur.

On the other hand, it is possible to achieve the object of the present invention through 40 to 70% of the twist of the entire twist through the above-mentioned brazing process. Here,% is the percentage of twist in total twist, and if twisted by 10%, the total twist is 90%. It is difficult to achieve the object of the present invention if the degree of grain boundary deviates from the above range. In this case, preferably, the twist of the yarn remaining through the seam can be 800 to 2800 T / M, and in this case, the range of the seam must be satisfied.

Next, in the step (5), the step of transferring the partially melted yarn to the second heating section and heating. Specifically, the yarn passing through the second godet roller 330 passes through the second heating unit 420. In this case, the temperature of the second heating part 420 may be 190 to 230 ° C. If the heating temperature of the second heating unit 420 is less than 190 ° C, the twist may not be fixed. If the heating temperature is more than 230 ° C, the twist may not be released during the dyeing process.

On the other hand, the heating temperature of the first heating portion may be higher than the heating temperature of the second heating portion. If the temperature of the first heating portion is equal to or lower than the temperature of the second heating portion, there may arise a problem that the stretchability is insufficient after the dyeing process.

The yarn passed through the second heating unit is guided to the winding roller 350 via the third godet roller 340.

On the other hand, preferably, the total stretching ratio of the polyester false warp yarn may be 1.4 to 1.75. If the total mystery ratio is less than 1,400, nonuniformity may occur in the dyeing, and if it exceeds 1.750, a mowing problem may occur.

The polyester false-twist yarn of the present invention produced by the above-mentioned method satisfies all of the following conditions (1) to (5) and has post-burning flammability characteristics, and more preferably satisfies the following conditions (6) to Thereby maximizing the physical properties.

(1) the LEESONA shrinkage is 3 to 7%, (2) the elastic recovery is 10 to 25%, (3) the elongation at break is 20 to 35%, (4) ) Strength is 3.0 to 4.0 G / D. (6) the number of twists after dyeing is 800 ~ 2800 T / M, (7) the monosyphite is 2-5 denier, (8) the total fineness is 50-200 denier, (9) the RESIDUAL shrinkage is 6-15 %, And can have. This not only has a similar touch feeling but also has a high stretchability and a stretch recovery property, but also has a cool feeling, a softness and a drape characteristic without having undergone a flammability process after the lead-in. Therefore, it is possible to have a distinctive touch feeling and softness at the same time as the stretchable fibers which only show the conventional soft stretch, and it is possible to fabricate not only the fabric but also the knitted fabric by using the circular knitting machine.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Examples and Comparative Examples &

A yarn of polyethylene terephthalate having an intrinsic viscosity of 0.64 dl / g as 150de / 36fila was prepared and the final polyester false-weave yarn was produced through the same process as shown in Fig. The specific processing conditions are shown in Table 1.

<Experimental Example>

Fabrics or circular pieces were prepared for the polyester false-twist yarns prepared through the above Examples and Comparative Examples, and the following physical properties were evaluated. The results are shown in Table 1.

1. Measurement of strength and elongation at break

The fineness of the false-twist yarn was measured by weighing 90 m of the tare which was 1 m when it was rotated once, and converting it into 9,000 m. The strength of the fiber and the elongation at break were measured using an automatic tensile tester (Textechno) at a speed of 50 cm / min and a grip distance of 50 cm.

2. Elasticity recovery rate

ASTM D 6720, and the sample was immersed in water at 100 ° C for 15 minutes by adjusting the number of revolutions of the sample in accordance with the fineness so as to obtain a 5000 denier, and L1 and L2 were measured as follows and calculated by the following equation .

 L1: After applying 30g + 1000g load, measure (stress & relax 3 times)

 L2: 1000g Load removal 30 seconds later, measurement

 [formula]

Elastic recovery rate = (L1-L2) x 100 / L2

3. LEISONA shrinkage ratio

The initial length of the specimen (20.5 ÷ 0.0016 ÷ de ÷ 2) meter (m) was rolled on a tread having a length of 1 m per rotation to connect the both ends to an initial length of 50 cm and an initial load of 20.5 g Heat treatment was carried out for 10 minutes in hot water of 占 폚 2 占 폚 and left for 3 to 5 minutes (left until the drop of water did not fall). The length was measured and the initial length and remaining length were measured to determine the shrinkage.

4. Touch feeling

The effect of the fabric on the woven fabric was evaluated by ten experts. The score was given as a score of 10 out of 10, and it was expressed as the average score.

5. Fused water

And the melt number per m of the false twist yarn was measured.

6. RESIDUAL Shrinkage (RES Shrinkage)

The initial length of the sample (20.5 ÷ 0.0016 ÷ de ÷ 2) meter (m) was rolled on a tread of 1 m in one rotation to connect the two ends to form an initial length of 50 cm and an initial load of 1.5 g Heat treatment was carried out for 10 minutes in hot water of 占 폚 2 占 폚 and left for 3 to 5 minutes (left until the drop of water did not fall). The length was measured and the initial length and remaining length were measured to determine the shrinkage.

7. Drapeiness

As a result of sensory test by 10 experts, it was judged that 8 or more people had drape, 5 ~ 7 people had drape, and 5 people were drape. Respectively.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 First speed 290 M / M 290 290 290 290 290 290 290 290 290 Second speed 450 M / M 450 450 450 450 450 450 450 450 450 H1 temperature 230 190 250 230 230 230 230 230 230 230 H2 temperature 220 220 220 180 240 220 220 220 220 220 Cooling temperature 50 50 50 50 50 20 90 50 50 50 Number of false twists 3000 T / M 2400 T / M 3500 T / M 3000 T / M 3000 3000 3000 1500 T / M 3000 T / M 3000 (%) 50% 50 50 55% 45% 50% 50 50 30% 80% LEE shrinkage 4.4% 5.4% 3.4% 6.4% 4.4% 4.5% 4.6% 4.4% 10.8% 2.4% RES shrinkage 10.4% 11.1% 9.5% 12.4% 10.4% 10.5% 10.5% 10.4% 16.4% 10.4% Elastic recovery rate 20% 16% 21% 20% 20% 19% 21% 8 % 9% 18% Welded water 5 EA / M 5 EA / M 12 EA / M 5 EA / M 13 EA / M 4 EA / M 6 EA / M 5 EA / M 25 EA / M 2 EA / M burglar 3.60 G / D 3.60 G / D 3.60 G / D 3.60 G / D 3.60 G / D 3.60 G / D 3.60 G / D 3.60 G / D 3.60 G / D 3.60 G / D Number of kinks after dyeing 1500 T / M 1200 T / M 1750 T / M 1350 T / M 1650 T / M 1500 T / M 1500 T / M 750 T / M 2100 T / M 600 T / M Mono fineness 2.8 D 2.8 D 2.8 D 2.8 D 2.8 D 2.8 D 2.8 D 2.8 D 2.8 D 2.8 D Total fineness 100 D 100 D 100 D 100 D 100 D 100 D 100 D 100 D 100 D 100 D Drape Castle Great usually usually usually Great usually usually Bad Great Bad touch 10 9 7 9 8 8 9 6 7 8

In Table 1, the first speed is the linear velocity mpm of the first godet roller, the second speed is the linear velocity mpm of the second godet roller, the H1 temperature (占 폚) and the H2 temperature (占 폚) (T / M) of twist in the false twist portion,% of the twist in the second godet roller, twist after twisting (T / M) in the second godet roller, the temperature of the second heating portion, (T / M) after dyeing false-twist yarn.

As can be seen from Table 1, it can be confirmed that the examples satisfying the range of the present invention have remarkably excellent elastic recovery, drapability, and tactility as compared with the comparative examples.

The polyester false-twist yarn of the present invention is excellent in all of the tactile feelings and can be usefully used in the textile industry.

100: feed roller 320: first godet roller
420: first heating section 430: cooling plate
500: false portion 330: second godet roller
440: second heating section

Claims (14)

In the method for producing a polyester false warp yarn,
(1) feeding unstretched polyester filament yarns to a first godet roller;
(2) heating the filament yarn passed through the first godet roller to 200 to 240 캜 and cooling the filament yarn to 30 to 80 캜 through a cooling section;
(3) twisting the filament yarn passed through the cooling section at a twist of 3000 to 4000 T / M;
(4) the twisted filament yarn is transferred to the second godet roller and the twisted filament yarn is twisted 40 to 70% of the total twisted yarn; And
(5) transferring the partially melted filament yarn to a second heating section and heating the melted filament yarn to 190 to 230 DEG C to produce a polyester false-
Wherein the stretching ratio through the first godet roller and the second godet roller is 1.4 to 1.75,
Wherein the temperature of the first heating portion is higher than the temperature of the second heating portion,
Wherein the polyester false warp yarn has a fusing property of 5 pieces / M or less and a twist number after dyeing of 1500 to 2000 T / M. delete delete delete delete delete The method according to claim 1,
Wherein the polyester is a polyethylene terephthalate (PET). A polyester false warp yarn having a flame retardancy after pre-firing satisfying all of the following conditions (1) to (9).
(1) Risona shrinkage ratio 4.4 to 10%
(2) Elastic recovery rate 20 to 25%
(3) Elongation at break 20 to 35%
(4) Fusing water 5 pieces / M or less
(5) Strength 3 to 4 G / D
(6) Number of kinks after dyeing 1500 ~ 2000 T / M
(7) Monosan islands 2-5 denier
(8) Total fineness 50 to 200 denier
(9) Residual shrinkage ratio 10.4 to 15% delete delete delete 9. The method of claim 8,
Wherein the polyester is polyethylene terephthalate (PET). A knitted fabric comprising the polyester false yarn of any one of claims 8 and 12. 13. A fabric comprising the polyester twist yarn of any of claims 8 and 12.

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