KR100646649B1 - A textured yarn with different shrinkage and excellent softness, and a process of preparing for the same - Google Patents

Abstract

The present invention relates to a biaxially twisted composite twisted yarn having excellent softness. In the manufacture of a biaxially twisted composite twisted yarn comprising a bicomponent composite yarn composed of a fiber-forming component and an eluting component and a high-yarn yarn, 20-45%, two-component composite yarns (effect yarns) with strength 2.0-5.0 g / denier, boiling shrinkage less than 2-10%, elongation 20-45%, strength 2.5-5.0 g / Denier, and the high shrinkage yarn (judge) having a boiling contraction rate of 10 to 40% is first mixed, and then combusted. In the present invention, the two-component composite yarn and the high shrink yarn composed of the fiber-forming component and the eluting component are mixed, and the crimp ratio (CR ₁ ) before eluting the eluting component in the two-component composite yarn is 10 to 40%, It is characterized in that the crimp rate (CR ₂ ) after eluting the eluting component in the two-component composite yarn is 10-35%. The bi-shrink composite twisted yarn of the present invention is excellent in bulkiness, crimp rate and softness in the production of knitted fabrics, and the flammability processability is greatly improved.

Softness, double shrink composite twisted yarn, crimp rate, bitumen, blend fiber, two-component composite yarn, high shrink yarn

Description

A textured yarn with different shrinkage and excellent softness, and a process of preparing for the same}             

1 is a process schematic diagram of the present invention

2 is a process schematic of the prior art

※ Explanation of main parts in drawings

A: Two-component composite yarn B: High shrink yarn C: Double shrink composite twisted yarn

1: 1st supply roller 2: Air entanglement device (horn mixing device)

3: second supply roller 4: hot plate 5: burner

6: 3rd supply roller 7: 4th supply roller

The present invention relates to a biaxial composite twisted yarn having excellent softness and a manufacturing method thereof.                         

Synthetic fiber with excellent physical properties has been used as a yarn for clothing with natural fiber for a long time, but synthetic fiber has a problem that it is cold to the touch and lacks softness (soft touch).

As one method of imparting a soft touch to synthetic fibers like natural fibers, ultrafine synthetic fibers having a monofilament fineness (monofilament fineness) of 1.0 denier or less have been developed. Ultra-fine synthetic fibers have touch and functionality more than natural fibers, are easy to process, easy to handle, and can be mass-produced at low cost.

Usually, the ultrafine synthetic fibers are produced by direct spinning or composite spinning.

The direct spinning method is difficult to manufacture ultra-fine fibers of less than 0.1 denier because it is directly spun through the detention, and various problems occur in the processing and weaving stage.

On the other hand, the composite spinning method produces a two-component composite yarn by composite spinning of different polymers such as polyester / polyamide composition or polyester / copolymer polyester composition, and then fibrils are physically or chemically processed during the post-processing process. It is prepared by separating and dividing. Therefore, it is easy to manufacture ultrafine fibers of 0.1 denier or less, and since fibrils are separated and divided during the post-process, it is easy to complex with other fibers and has good processing and weaving processability.

However, when the two-component composite yarn prepared by the composite spinning method alone is used in a knitted fabric, it has a disadvantage in that buffing, laryngeal feeling, drape, and rupture strength are poor. In particular, in the case of the composite spinning of the polyester / co-polyester composition, because the copolyester is extracted by the weight loss, a space is created between the tissues, resulting in a severe decrease in the larynx, drape, and rupture strength of the fabric.

In order to solve the problems caused by using ultra-fine synthetic fibers or two-component composite yarns alone, a method of combining ultra-fine synthetic fibers and other fibers is disclosed in US Pat. No. 6,038,847.

As a conventional technique of complexing two-component composite yarns with other fibers, first, a method of stretching and twisting two-component composite yarns in an unstretched state is known. The bishrink composite yarn produced by the above method exhibits excellent bulkiness due to the bishrinkage difference between the bulky ultrafine fibers and the high shrink yarn during the post-process, and the high shrink yarn used for the screening shows the excellent strength and drape because It has the advantage of being.

However, in the first method, since the unstretched bicomponent composite yarn having weak physical properties is stretched and combusted alone, process stability is very low under normal flammability conditions, and a processed yarn having excellent bulkiness cannot be obtained.

For example, when stretching / twisting a two-component composite yarn having a polyester / copolymer polyester composition, the thermal stability of the copolyester is poor. Therefore, a temperature setting lower than the normal combustion temperature is inevitable, and a sufficient number of combustible water (twisted water / There is a problem that cannot give unit length.

As a result, the manufactured composite yarn is bulky, that is, the crimp rate (CR%) is very low. Crimp rate is a representative property that shows the bulkiness and quality of the fabric during post-processing. Due to the low crimping rate, it is not possible to obtain high quality fabrics because the ultrafine fibers are not sufficiently blown on the fabric surface.

As a second conventional technique of combining two-component composite yarns with other fibers, a method of simultaneously twisting unstretched ultrafine filament fibers and unstretched high shrink yarns and then air-interlacing them is being carried out. The method has the advantage of expressing excellent bulkiness

However, in the second method, since the untwisted two-component composite yarn and the unstretched high shrink yarn are drawn and twisted at the same time, the air is entangled. Due to the high occurrence of moor and loop, it is inferior in fairness and combusts two-component composite yarns with poor physical properties, so it is inevitable to set low combustion temperature and low combustion angle. This leads to a drop in bulkiness, that is, a crimp rate.

It is an object of the present invention to provide a bi-shrink composite twisted yarn and a method for producing the same, which are excellent in bulkiness, that is, have a crimp rate, and that there is almost no decrease in the crimp rate even after the extraction process, unlike the conventionally presented method.

The present invention is to provide a bi-shrink composite twisted yarn that exhibits excellent softness and appearance due to high hair density after the buffing process in the manufacture of knitted fabrics. In another aspect, the present invention is to provide a method for producing a bi-shrink composite twisted yarn that can significantly improve the process rate during the twisting process by air-interlacing the stretched, heat-treated two-component composite yarns with high shrink yarn before the twist treatment.

The manufacturing method of the present invention for achieving the above problems is to mix bicomponent composite yarn and high shrink yarn composed of fiber-forming component and eluting component to produce a bi-shrink composite twisted yarn, (ⅰ) elongation 20 ~ 45 %, Strength 2.0-5.0 g / denier, bicomponent composite yarn (effect yarn) with boiling shrinkage less than 2-10%, elongation 20-45%, strength 2.5-5.0 g / denier The high shrinkage yarn (judge) having a boiling contraction rate of 10 to 40% is first mixed with the air and then combusted.

The bi-shrink composite false twisted yarn of the present invention prepared as described above is composed of a fiber-forming component and an eluting component, and a two-component composite yarn and a high shrink yarn are mixed, and the crimp ratio before eluting the eluting component in the two-component composite yarn (CR ₁ ) Is 10 to 40%, and the crimp ratio (CR ₂ ) after eluting the eluting component in the two-component composite yarn is characterized in that 10 to 35%.

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

1 is a process schematic diagram of the present invention.

The present invention is characterized in that the stretch-treated two-component composite yarns are first subjected to air entanglement with high shrink yarns, and then flammable, thereby greatly improving the flammability processability. The two-component composite yarn refers to a conventional composite fiber composed of a fiber-forming component and an eluting component.                     

First, the present invention feeds a two-component composite yarn (A) and a high shrink yarn (B) consisting of a fiber-forming component and an eluting component to the first feed roller (1), and then the first feed roller (1) and the first 2 Mix in the air entanglement device (2) located between the supply roller (3). The two-component composite yarn can be produced by using a composite spinning as usual using polyester as a fiber-forming component, polyamide or copolyester as an elution component.

When the eluted component is eluted by an alkali weight loss treatment process after fabrication of the knitted fabric, the two-component composite yarn becomes ultrafine with 0.001 to 0.5 denier. In particular, the present invention is characterized by using a two-component composite yarn having 20 to 45% elongation, 2.0 to 5.0g / denier, boiling shrinkage less than 2 to 10% through the stretching and heat treatment process after the composite spinning.

Meanwhile, the high shrinkage yarn may be prepared by copolymerizing 1-15 mol% of isophthalic acid or dimethyl 5-sulfoisophthalate sodium in terephthalic acid, which is a main component, and spinning, stretching and heat-treating them. The elongation of the high shrinkage yarn 20 to 45%, strength 2.0 to 5.0g / denier, boiling shrinkage 10 to 40%, single yarn fineness to 1.0 to 6.0 denier. When the single yarn fineness of the high shrink yarn is out of the range, the strength and drape of the knitted fabric may be reduced.

It is preferable to adjust the weight ratio of the two-component composite yarn (A): high shrinkage yarn (B) at the time of blending to 4: 6-8: 2. If the weight ratio of the two-component composite yarn (A) exceeds the above range, the shrinkage effect, the drape and the machining processability may worsen. If the weight ratio of the two-component composite yarn (A) exceeds the above range, the softness of the fabric may be lowered and there may be a torsion. There is.

In the intermixing (air entanglement), it is preferable that the speed of the first feed roller 1 is higher than the speed of the second feed roller 3 to give an overfeed rate of 1 to 5%, and the air jamming device 2 ), The air pressure is preferably set to 2 ~ 5kgf / ㎠.

Subsequently, the air-entangled yarn is combusted and heat treated in the combustor 5 and the hot plate 4 provided between the second feed roller 3 and the third feed roller 6. At this time, the yarn imparted with twist by the combustor 5 is heat treated in the hot plate 4 and decomposed at the bottom of the combustor 5. The temperature of the hot plate is preferably about 150 ~ 200 ℃, the combustible water is preferably set under the conditions of the following equation.

Further, the overfeed rate between the second supply roller 3 and the third supply roller 6 is preferably set between -5 and + 5%. The heat treated and combusted yarn is wound up in the take-up bobbin via the fourth feed roller 7.

The present invention uses the stretched and heat treated two-component composite yarn and at the same time, after the air contraction with the high shrink yarn, and the combustible treatment is very excellent in the flammability processability. As a result, it is possible to perform a flammable treatment under ordinary flammable conditions, thereby further improving the bulkiness of the bi-shrink composite flammable yarn.

The bishrink composite false twisted yarn of the present invention prepared as described above has a crimp rate (CR ₁ ) before treatment for 30 minutes in a 1% aqueous sodium hydroxide solution at 95 ° C., that is, a crimp rate before eluting the eluted component in the two-component composite yarn is 10 ~ 40%.

In addition, the crimp rate (CR ₂ ) after treatment for 30 minutes in a 1% aqueous sodium hydroxide solution at 95 ° C., that is, the crimp rate after eluting the component eluted in the two-component composite yarn is 10 to 35%.

In addition, the bi-shrink composite false twisted yarn of the present invention has an elongation of 20 to 45%, strength of 2.5 to 5.0 g / denier, and boiling ratio of 5 to 30%.

The bi-shrink composite twisted yarn of the present invention can produce a woven fabric having excellent softness and appearance when subjected to conventional post-processing processes such as weaving or knitting, weight loss, buffing, brushing, and dyeing.

In the present invention, various yarn physical properties were evaluated by the following method.

Strength and elongation

The average value is obtained by measuring 50 times with a tensile tester of Instron Co., Ltd. (sample length 5cm, tensile speed: 30mm / min).

Boiling Shrinkage (%)

After the yarn is wound 10 times on a spinning wheel with a winding tension of 0.1 g / denier to form a yarn skein (sample), the sample length L ₀ is measured under a static load of 0.1 g / denier. Subsequently, the sample is allowed to stand in boiling water of 95 ° C. or higher for 30 minutes, and then dried and naturally dried in a standard state. Next, measure the sample length (L ₁ ) under a static load of 0.1g / denier, and then substitute the L ₀ and L ₁ value thus measured in the following equation to obtain the boiling shrinkage.

Elution component Crimp ratio before dissolution (CR _One )

The yarn is wound 10 times on a spinning wheel with a winding tension of 0.1 g / denier to form a yarn skein (sample), and then the crimp is expressed in boiling water of 95 ° C. or higher for 30 minutes. Subsequently, after the water in the sample was removed, it was naturally dried in a standard state, and then left for 20 minutes at a static load of 0.1 g / denier and a super load of 0.002 g / denier in 20 ± 2 ° C. water, and then the sample length (L ₀ ). Measure Next, the static load of 0.1 g / denier is immediately removed, and the sample length (L ₁ ) is measured after being left for 3 minutes while only the super load is applied. Substituting a measured value L ₀ and L ₁ as described above in the following equation to calculate the appearances crimp rate for eluting component.

Crimp ratio after elution component (CR ₂ )

The yarn was wound 10 times on a spinning wheel with a winding tension of 0.1 g / denier to form a yarn skein (sample), and then treated with 95% 1% aqueous sodium hydroxide solution for 30 minutes to elute the elution component and express the crimp. Subsequently, after the water in the sample was removed, it was naturally dried in a standard state, and then left for 20 minutes at a static load of 0.1 g / denier and a super load of 0.002 g / denier in 20 ± 2 ° C. water, and then the sample length (L ₀ ). Measure Next, the static load of 0.1 g / denier is immediately removed, and the sample length (L ₁ ) is measured after being left for 3 minutes with only the super load applied. Substituting a measured value L ₀ and L ₁ as described above in the following equation to calculate the appearances crimp rate for eluting component.

Softness

Sensory evaluation was performed by 10 experts. If 8 or more is good, it is classified as excellent, 4 to 7 is good, and 3 or less is good.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

Example 1

100% denier / 36 filament with 30% elongation, 3.5g / denier, 8% boiling shrinkage Single component fineness of the component: 0.07 denier) bicomponent composite yarn (A) was prepared. Meanwhile, 10 mol% of isophthalic acid was copolymerized with the main component terephthalic acid, and then spun, stretched and heat treated to 40 denier / 12 filaments having 32% elongation, 4.0 g / denier, and 13% boiling shrinkage (single fineness). : 3.33 denier) high shrink yarn (B) was prepared. After supplying the two-component composite yarn (A) and the high shrink yarn (B) to the first supply roller (1) as shown in Figure 1, it is installed between the first supply roller (1) and the second supply roller (3) It was mixed with an air entanglement (2). At this time, the overfeed rate was set at 2.8% and the air pressure was 4.2kgf / ㎠. Subsequently, the mixed yarn is combusted and heat treated with the combustor 5 and the hot plate 4 provided between the second feed roller 3 and the third feed roller 6, and then through the fourth feed roller 7. By winding, biaxial composite twisted yarn was produced. At this time, the hot plate temperature is 160 ℃, the number of combustible soft water is 2,500T / M, the draw ratio is 0.01, the firing speed of the third feed roller (6) was set to 400m / min. Using a biaxial composite twisted yarn manufactured as described above as a warp yarn, weaving a satin tissue fabric using a conventional polyester stretched twisted yarn (150 denier / 48 filaments) as a weft, and then reduced the weight, Processed paper was prepared by buffing, brushing, and dyeing. The results of evaluating the physical properties of the produced biaxial composite twisted yarn and processed paper are shown in Table 1.

Example 2

Composite spinning of polyester, a fiber-forming component, and copolyester, an eluting component, followed by stretching and heat treatment, 120 denier / 48 filaments having 30% elongation, 3.5g / denier, and 7% boiling shrinkage Single component fineness of 0.2 component: 0.2 denier) was prepared a two-component composite yarn (A). Meanwhile, copolymerized with 10 mole% of isophthalic acid to the main component terephthalic acid, which was spun, stretched and heat-treated to obtain 60 denier / 12 filaments with 35% elongation, 3.8 g / denier, and 11% boiling shrinkage (single fineness). : 5 denier) high shrink yarn (B) was prepared. After supplying the two-component composite yarn (A) and the high shrink yarn (B) to the first supply roller (1) as shown in Figure 1, the air installed between the first supply roller (1) and the second supply roller (3) It was mixed with the entanglement device (2). At this time, the overfeed rate was set at 3.0% and the air pressure was 4.2kgf / cm 2. Subsequently, the mixed yarn is combusted and heat treated with the combustor 5 and the hot plate 4 provided between the second feed roller 3 and the third feed roller 6, and then through the fourth feed roller 7. By winding, biaxial composite twisted yarn was produced. At this time, the hot plate temperature was set to 185 ℃, the number of combustible soft water 2,300T / M, the draw ratio is 0.01, the firing speed of the third feed roller (6) is 450m / min. Using a biaxial composite twisted yarn manufactured as described above as a warp yarn, weaving a satin tissue fabric using a conventional polyester stretched twisted yarn (150 denier / 48 filaments) as a weft, and then reduced the weight, Processed paper was prepared by buffing, brushing, and dyeing. The results of evaluating the physical properties of the produced biaxial composite twisted yarn and processed paper are shown in Table 1.

Comparative Example 1

Composite spinning of polyester, a fiber-forming component, and copolyester, an eluting component, at a spinning speed of 3100 mm / min, 170 denier / 36 filament with 135% elongation, 2.8 g / denier, and 8% boiling shrinkage ( Single yarn fineness of the fiber-forming component: 0.07 denier) bicomponent composite yarn (A) was prepared. Meanwhile, 10 mol% of isophthalic acid is copolymerized with terephthalic acid as a main component, and it is spun, stretched and heat-treated to obtain 40 denier / 12 filaments with 32% elongation, 4.0 g / denier and 9% boiling shrinkage (single fineness). : 3.33 denier) high shrink yarn (B) was prepared. After supplying the two-component composite yarns (A) and the high shrink yarn (B) to the first feed roller (1) as shown in FIG. 2, a hot plate installed between the second feed roller (3) and the third feed roller (6). (4) and the combustor (5) were combusted and heat treated. At this time, the hot plate temperature was set to 135 ℃, the number of combustible water 1,950T / M, the draw ratio is 1.70, the firing speed of the third feed roller (6) was set to 400m / min. Subsequently, the combustible yarn was mixed with an air entanglement device 2 provided between the third feed roller 6 and the fourth feed roller 7. At this time, the overfeed rate was set to 2.5%, and the air pressure was set to 4.0kgf / ㎠. Using a biaxial composite twisted yarn manufactured as described above as a warp yarn, weaving satin tissue fabric using a conventional polyester stretched twisted yarn (150 denier / 48 filament) as a weft yarn, and then reduced the weight, Processed paper was prepared by buffing, brushing, and dyeing. The results of evaluating the physical properties of the produced biaxial composite twisted yarn and processed paper are shown in Table 1.

Property evaluation result division Yarn Properties Processed paper softness Strength (g / d) Elongation (%) Boiling shrinkage (%) CR ₁ (%) CR ₂ (%) Example 1 3.2 29 13 25 21 Great Example 2 3.5 31 15 28 23 Great Comparative Example 1 2.8 32 18 12 3 Bad

The bi-shrink composite twisted yarn of the present invention has high hair density in the manufacture of knitted fabrics, and is excellent in softness, appearance, and bulkiness. In addition, the manufacturing method of the present invention has particularly good flammability processability.

Claims (5)

In the production of bi-contracted composite twisted yarn by mixing two-component composite yarns composed of a fiber-forming component and an eluting component with a high shrink yarn, (i) the elongation is 20 to 45%, the strength is 2.0 to 5.0 g / denier, Two-component composite yarns (effect yarns) with a boiling shrinkage of less than 2 to 10% and (ii) high shrinking yarns with an elongation of 20 to 45%, a strength of 2.5 to 5.0 g / denier, and a boiling shrinkage of 10 to 40% ) Is first mixed (air entangled), and then combusted for producing a soft-shrink composite twisted yarn having excellent softness. The biaxial composite twisted yarn having excellent softness according to claim 1, wherein the single yarn fineness (single yarn fineness after weight loss) of the fiber-forming component in the bicomponent composite yarn is 0.001 to 0.5 denier. The bi-shrink composite twisted yarn having excellent softness according to claim 1, wherein the fine shrink yarn has a fineness of 1.0 to 6.0 denier. The bi-screw composite twisted yarn having excellent softness according to claim 1, wherein the weight ratio of the bicomponent composite yarn to the high shrink yarn is 4: 6 to 8: 2. The two-component composite yarn and the high shrink yarn composed of the fiber-forming component and the eluting component are mixed, and the crimp ratio (CR ₁ ) before eluting the eluting component in the two-component composite yarn is 10 to 40%, and the two-component composite Crimp ratio (CR ₂ ) after eluting the in-house eluting component is a _bi- spinning composite twisted yarn excellent in softness, characterized in that 10-35%.

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