KR20090074363A - Thick and thin yarn and method of manufacturing the same - Google Patents

Abstract

Thick and thin yarn and a manufacturing method thereof are provided to manufacture the yarn with a conventional spin-draw method without a separate additional facility. Thick and thin yarn has a cross-sectional shape in which a polyethylene terephthalate copolymer and a polyethylene terephthalate of low molecular weight are welded to a side by side shape. The yarn has specific load of 30~45%, intensity of 3.3~3.7g/d and a uniformity ratio of 2.5~6.0%. The number average molecular weight the polyethylene terephthalate of the low molecular weight is 10,000~20,000. A crystallization constraint ingredient is one or more selected among isophthalic acid, neopentyl glycol, cyclohexanedimethanol and adipic acid.

Description

Tesesa and its manufacturing method {Thick and thin yarn and method of manufacturing the same}

The present invention relates to a poise yarn and a method of manufacturing the same, and more specifically, to a two-side polyester-based resin composite yarn to form a side by side of the yarn cross-section (Side by side) after the spinning direct stretching method The present invention relates to a method for manufacturing a stretcher having excellent stretch and posture effect by stretching and winding, and a stretchable stretcher manufactured therefrom.

In the case of poems, the thick part and the thin part with relatively high fineness in the length direction of the yarn are alternately repeated so that the feel is soft and the dichroic part of the concentrated and biliary areas is expressed during dyeing (hereinafter referred to as the "posture effect"). It is widely used as a yarn having).

As a prior art for manufacturing a poem yarn, Republic of Korea Patent No. 88-476 proposes a method using a heating rod and a movable guide when spinning the thermoplastic resin, and Republic of Korea Patent No. 93-10805 proposes a thermoplastic stretched yarn and a rotary gear It proposes a method to pass between uneven rollers.

However, the above conventional methods have a complicated problem in manufacturing apparatus and process.

As a result, until now, the thermoplastic resin is spun and wound to produce partially undrawn yarn (hereinafter referred to as a "POY process"), and then the partially undrawn yarn is stretched and flammed to produce thermoplastic multifilament. The method of manufacturing the poemssa is most widely used as a method of inducing irregular stretching by adjusting conditions, but the method also has a complicated manufacturing process.

In order to solve the above problems, when the thermoplastic stretched yarn is manufactured by spin-draw, the stretching is performed while periodically changing the stretching ratio and the stretching temperature between the first high roller and the second high roller. There is also a method for manufacturing the posture yarn, but the method is fixed in the drawing point thick and long intensive appearance of the posture is difficult to obtain high-quality posture effect, the unstretched portion is eluted by the weight loss during processing, and appear as a defect on the fabric There was a problem.

In order to solve the problems of the prior art of manufacturing a poem yarn by the radial direct stretching method, Korean Patent Publication No. 96-36720 discloses a heating element installed between a first go roller and a second go roller of a direct spinning process. It proposes a method of improving the uniformity of the pore yarn without heating the drawing part by intensively heating and drawing the undrawn yarn passing through, but the method and the problem that can be applied only in the production of low fine filament There was a complicated problem.

The polyester-based poised yarn prepared by the prior art is 50 ~ 60% elongation, the strength is 2.8 ~ 3.2g / denier level, the leveling agent is 2.0 ~ 4.0% level, has a posture effect but low elasticity.

In the present invention, it is intended to provide a polyester-based poised yarn excellent at the same time as well as the posture effect.

In addition, the present invention can manufacture a poised yarn having excellent posture effect and elasticity by the existing radial direct drawing method, without additional equipment, the manufacturing apparatus and manufacturing process is simplified, and the manufacturing method of poised yarn easy to manage manufacturing conditions To provide.

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

First, as shown in FIG. 1, the poise according to the present invention has a cross-sectional shape in which a low molecular weight polyethylene terephthalate and a copolymerized polyethylene terephthalate in which a crystal suppressant is copolymerized are bonded in a side by side form. It has an elongation of 30 to 45%, an intensity of 3.3 to 3.7 g / d, and a uniformity of 2.5 to 6.0%.

1 is a cross-sectional photograph of the poise of the present invention.

Conventional polyethylene terephthalate has a number average molecular weight of about 25,000, but the low molecular weight polyethylene terephthalate preferably has a number average molecular weight of 10,000 to 20,000.

Specific examples of the crystal inhibiting component include isophthalic acid, neopentyl glycol, cyclohexane dimethanol, adipic acid or mixtures thereof.

Posture according to the present invention elongation is 30 ~ 45%, strength is 3.3 ~ 3.7g / d, uniformity is 2.5 ~ 6.0%, if outside the range of physical properties and posture effect and / or elasticity is reduced.

Next, look at the manufacturing method of the poxsa according to the present invention.

In the present invention, a low-molecular-weight polyethylene terephthalate and a copolymerization polyethylene terephthalate copolymerized with a crystal suppression component are prepared on the fabric by a radial direct drawing method in a side by side form.

Specifically, according to the present invention, the method of manufacturing the pompsa composite spun the low molecular weight polyethylene terephthalate and the copolymerization polyethylene terephthalate copolymerized with the crystal suppression component so that the yarn cross-section side-side (Side by side) form, Continuously radiated composites are wound after heating and stretching in a spin-draw manner between the first high roller (2) and the second high roller (3).

The number average molecular weight and the crystal suppression component of the low molecular weight polyethylene terephthalate are as described above.

In more detail, in the present invention, in preparing a pore yarn by a direct-stretching method, first, a low molecular weight polyethylene terephthalate and a copolymerized polyethylene terephthalate copolymerized with a crystal inhibiting component are yarns through the spinneret 1 of FIG. Composite spinning is performed so that the cross-section is side by side.

Next, the composite spun radiant is successively heated and stretched between the first high roller (2) and the second high roller (3) of FIG.

It is preferable that the temperature of the said 1st high roller 2 is 80-100 degreeC, and the speed is 800-1500 m / min.

When the speed of the first high roller (2) is less than 800 m / min, the radial tension applied to the first high roller (2) and the lower portion of the spinneret (1) is unstable, making it difficult to form yarns (filaments) due to disturbance. In the case of more than 1,500m / min, the necking phenomenon of the undrawn yarn does not occur at the drawing point, so it is difficult to distinguish between the part and the detail and the posture effect may be reduced.

It is preferable that the temperature of the said 2nd high roller 3 is 110-130 degreeC, and the speed is 3,500-4,500m / min.

If the temperature of the second gourd roller is less than 110 ° C, the poultry system's bactericidal system exceeds 6.0% and the posture effect is too severe. There is a risk of doing so.

It is preferable that the draw ratio between the 1st high roller 2 and the 2nd high roller 3 is 2.5 to 3.5 times.

The present invention prepared as described above is made of yarn because the copolymer of crystal suppression component is copolymerized with the high shrinkage the copolymerized polyethylene terephthalate and low molecular weight polyethylene terephthalate in the form of side by side on the yarn cross-section, yarn production When heat is applied in processes such as refining, shrinking, heat setting, and dyeing, an orientation difference and shrinkage stress difference are generated in the yarn interface to change into a three-dimensional form having a spring-like structure. It becomes possible. That is, when the yarn is immersed for 30 minutes under boiling water tension at 100 ° C. due to the difference in orientation and shrinkage stress, the yarn shrinkage reaches 20-50%. This is the valence rate due to the three-dimensional spring structure.

On the other hand, general polyester yarns produced by direct spinning by spinning a typical polyethylene terephthalate having a number average molecular weight of 25,000 alone are only 7-15% of shrinkage when immersed for 30 minutes under boiling water at 100 ° C. Do.

According to the present invention, the three-dimensional spring structure is improved in elasticity because the shrinkage is about 13 to 35% higher than that of the conventional yarn as described above.

The posture of the present invention is excellent in the posture effect and elasticity at the same time.

In addition, the manufacturing method of the poise yarn according to the present invention can manufacture the poised yarn in the existing radial direct drawing method without the additional additional equipment in the existing radial direct stretching method without a separate additional equipment, the manufacturing apparatus and manufacturing process is simplified It is easy to manage the manufacturing conditions.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

However, the scope of the present invention is not limited by the following examples.

Example  One

A copolymer of polyethylene terephthalate having a number average molecular weight of 15,500 and an intrinsic viscosity of 0.52 and an isophthalic acid copolymerized with 11 mol% of copolymerized polyethylene terephthalate was mixed in a side by side cross section as shown in FIG. 1 at a weight ratio of 50:50. Subsequently, the radiated radiant is heated and stretched between the first high roller (2) and the second high roller (3) according to the radial direct drawing process shown in FIG. A tread yarn of 24 filaments was prepared.

At this time, the temperature of the 1st high roller 2 was 80 degreeC, and the speed was 1,260 m / min.

Moreover, the temperature of the 2nd high roller 3 was 110 degreeC, and the speed was 4,030 m / min. In addition, the draw ratio was 3.2 times.

The fabric was prepared by dying after interlocking with an interlock in a 32 gauge circular knitting machine using the Taesa yarn prepared as described above.

The results of evaluating the various properties of the prepared posa and fabric are shown in Table 1.

Example  2

A copolymer of polyethylene terephthalate having a number average molecular weight of 15,500 and an intrinsic viscosity of 0.52 and an isophthalic acid copolymerized with 11 mol% of copolymerized polyethylene terephthalate was mixed in a side by side cross section as shown in FIG. 1 at a weight ratio of 50:50. Subsequently, the radiated radiant is heated and stretched between the first high roller (2) and the second high roller (3) according to the radial direct drawing process shown in FIG. A tread yarn of 24 filaments was prepared.

At this time, the temperature of the 1st high roller 2 was 83 degreeC, and the speed was 1,260 m / min.

Moreover, the temperature of the 2nd high roller 3 was 112 degreeC, and the speed was 4,150 m / min. In addition, the draw ratio was 3.2 times.

The fabric was prepared by dying after interlocking with an interlock in a 32 gauge circular knitting machine using the Taesa yarn prepared as described above.

The results of evaluating the various properties of the prepared posa and fabric are shown in Table 1.

Comparative Example  One

A polyethylene terephthalate polymer having a number average molecular weight of 15,500 and an intrinsic viscosity of 0.52 and a polytrimethylene terephthalate having an intrinsic viscosity of 0.92 were combined and spun in a side by side cross section as shown in FIG. According to the radial direct drawing process shown in FIG. 2, the radiated material is heated and stretched between the first high roller (2) and the second high roller (3), and then wound on a winder (4) to obtain 75 denier 24 filaments. Stance was prepared.

At this time, the temperature of the 1st high roller 2 was 70 degreeC, and the speed was 1,350 m / min.

Moreover, the temperature of the 2nd high roller 3 was 122 degreeC, and the speed was 3800 m / min. In addition, the draw ratio was 3.2 times.

The fabric was prepared by dying after interlocking with an interlock in a 32 gauge circular knitting machine using the Taesa yarn prepared as described above.

The results of evaluating the various properties of the prepared posa and fabric are shown in Table 1.

Comparative Example  2

The polyethylene terephthalate polymer having a number average molecular weight of 22,000 and an intrinsic viscosity of 0.655 was spun off, and the spun spinning material was then subjected to the first go roller (2) and the second go roller (according to the radial direct drawing process shown in Fig. 2). After heating and stretching between 3) and wound around the winding machine (4) to prepare a pore yarn of 75 denier 24 filament.

At this time, the temperature of the 1st high roller 2 was 80 degreeC, and the speed was 1,260 m / min.

Moreover, the temperature of the 2nd high roller 3 was 110 degreeC, and the speed was 4,030 m / min. In addition, the draw ratio was 3.2 times.

The fabric was prepared by dying after interlocking with an interlock in a 32 gauge circular knitting machine using the Taesa yarn prepared as described above.

The results of evaluating the various properties of the prepared posa and fabric are shown in Table 1.

Stance and Fabric Property Evaluation Results  division Poise thread Yarn Properties Fine island (denier) Elongation (%) Strength (g / d) Leveling system (%) Boiling Water Shrinkage (%) Streky Yes / No Elasticity Example 1 72.6 35.4 3.70 3.54 36.9 U U Example 2 72.8 35.7 3.69 3.42 33.7 U U Comparative Example 1 74.5 42.3 3.35 0.80 18.6 radish U Comparative Example 2 74.1 43.3 4.23 0.60 12.3 radish radish

The fabric properties were subjected to a sensory test of 20 experts, and when 15 or more judged that the streaky or elasticity is good, less than 15 euros were classified as nothing if the streaky or elasticity is poor.

Meanwhile, the poise properties were evaluated in the following manner.

Strength and elongation

In accordance with 4.3.1 of KS K 0412 (Testing method for strength and elongation of filament yarn). However, the initial load is 2. (10) and the number of tests is 10.

· Leveling system

The non-uniformity test of KS K 0467 thread or the non-uniformity of KS K ISO 16549 textile products-threads is evaluated according to the capacitive method standard.

· Boiling water Shrinkage

KS K0215 (Test method of synthetic fiber filament yarn) shall be the method of measuring skein shrinkage, which is Method B, of the 6.12 shrinkage test method. At this time, the range of hot water at a suitable temperature in the measurement method is a temperature between 96 ~ 102 ℃, commonly referred to as 100 ℃.

1 is a cross-sectional picture of the poise of the present invention.

2 is a schematic view of a process for producing yarn in a radial direct drawing manner;

Figure 3 is a photograph of the surface of the dyed fabric prepared in Example 1.

Figure 4 is a surface photograph of the dyed fabric prepared in Example 2.

5 is a photograph of the surface of the dyed fabric prepared in Comparative Example 1.

Claims (12)

Copolymerized polyethylene terephthalate having low molecular weight polyethylene terephthalate and crystal inhibiting component copolymerized in the form of side by side, having an elongation of 30 to 45% and strength of 3.3 to 3.7 g / d, the posture agent characterized in that the leveling agent is 2.5-6.0%. The method of claim 1, wherein the low molecular weight polyethylene terephthalate has a number average molecular weight of 10,000 to 20,000 poised yarns.  The method according to claim 1, wherein the crystallization component is one type l phase selected from isophthalic acid, neopentyl glycol, cyclohexane dimethanol and adipic acid. The posture of claim 1, wherein the rate of contraction of boiling water is 20 to 50%. The composite polyethylene terephthalate copolymerized with low molecular weight polyethylene terephthalate and crystal suppressing component is spun into a yarn cross-section in the form of side by side, and then the continuous composite spun yarn is spun first. (2) Between the second gourd roller (3) manufacturing method of poised yarn, characterized in that the winding after heating and stretching in a spin-draw method (Spin-draw) method. The method of claim 5, wherein the temperature of the first go roller (2) is 80 ~ 100 ℃. The method of claim 5, wherein the speed of the first go roller (2) is 800 ~ 1500m / min. The method of claim 5, wherein the temperature of the second go roller (3) is 110 ~ 130 ℃. The method of claim 5, wherein the speed of the second high roller (3) is 3,500 ~ 4,500m / min. The method according to claim 5, wherein the stretching ratio between the first high roller (2) and the second high roller (3) is 2.5 to 3.5 times. The method of claim 5, wherein the low molecular weight polyethylene terephthalate has a number average molecular weight of 10,000 ~ 20,000. The method of claim 5, wherein the crystal inhibition component is a one-phase l phase selected from isophthalic acid, neopentyl glycol, cyclohexane dimethanol and adipic acid.

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