KR20060125164A - Latent crimped polyester thick and thin yarn and method of manufacturing the same - Google Patents

Abstract

A latent crimped polyester thick and thin yarn and a manufacturing method thereof are provided to reveal the natural appearance due to the melange effect. Two kinds of polyester polymers with the difference of the inherent viscosity of 0.5-2.0 are jetted through a complex spinneret(1) at the spinning temperature of 280-295 degrees in centigrade through a continued one process so that the longitudinal section thereof is formed as the side-by-side type. The polyester polymers are cooled and solidified. Thereafter, the oil is supplied to the polyester polymers by an oil supply device(3). The polyester polymers are passed through the first and second godet rollers(4,5) at the temperatures of 50-70 degrees in centigrade and 85-110 degrees in centigrade, drawn and then wound.

Description

Latent crimped polyester thick and thin yarn and method of manufacturing the same

1 is a schematic diagram of a manufacturing process (direct radiation drawing method) according to the present invention.

Figure 2 is a spectrogram (Spectrogram) graph obtained when measuring the homogeneity of the latent crimped polyester poem of the present invention.

* Explanation of symbols on the main parts of the drawings

1: complex radiation detention 2: cooling device

3: Lubrication device 4: The first high roll

5: 2nd gourd roll 6: Winding machine

The present invention relates to a latent polyester polyester yarn and a manufacturing method thereof, and more particularly, to a latent polyester polyester yarn and a method of manufacturing the same that expresses excellent elasticity and melange effect in the production of knitted fabrics.

In the present invention, the melange effect refers to the effect of expressing two different tones when dyeing a knitted fabric with one dye, and the poise yarn is a relatively thick portion of fineness along the length of the yarn ( Hereafter, the term " tabu " and the portion where the fineness is relatively thin (hereinafter referred to as " details ") mean a filament in which an irregular alternating cycle is repeated.

Much research has been conducted to impart crimping performance to synthetic fibers so that synthetic fibers have a soft touch like the wool of natural fibers and exhibit bulky bulkiness, resilience, drape and elasticity.

As a conventional technique of expressing elasticity by imparting crimping performance to polyester fibers, firstly, a method of imparting crimping property due to the shrinkage difference between constituent fibers by biaxially blending polyester fibers having different shrinkage properties, and secondly, polyester There is a method of blending polyurethane fibers in the fiber, and a third method of complex spinning of heterogeneous polymers of different characteristics into a single fiber. However, the conventional method did not express the appearance of natural melaztone, such as yarn.

Specifically, the first method is to add two or more kinds of yarns with a large difference in elongation characteristics to add or shrink the crimps on the dyeing process to give a difference in shrinkage. In other words, as shown in Japanese Patent Application No. 63-30421, it is possible to maximize the difference between the strain in the combustible region and the residual strain after decomposing. Is to use a car. However, the blended yarns produced by these methods have uneven appearance of crimps and poor adhesion between the fibers, resulting in inadequate durability such as separation between components or reduction of crimp characteristics due to external forces applied to the fibers during the post-processing process. It has disadvantages, and is manufactured through the weaving of two kinds of yarns, so there is a limit to the application in fineness, and thus there is a limit to expanding the use to knit fabrics. In addition, crimped yarns through multi-processing require multi-stage processing of two or more types of yarns produced first through separate processes. In addition to the spinning of each filament, the process of bitumen, plywood, twisted yarn, etc. causes a lot of time loss and the cost increase through additional processing.

The second method is a method of producing a knitted fabric by mixing a polyurethane fiber with excellent elasticity with other synthetic fibers, it is possible to give excellent elasticity. However, the dyeing process is difficult due to the difference between the physical and chemical properties of polyurethane and the physical and chemical properties of polyester, and has excellent elasticity but lacks soft touch. In particular, the problems of dye unevenness in dyeing, vulnerability to chlorine bleach in the bleaching stage, and hydrolysis by caustic soda are appearing as major disadvantages.

The third method is a side by side cross-sectional view of a single filament by complex spinning together heterogeneous polymers having different shrinkage or intrinsic properties, such as Japanese Patent Laid-Open No. 2-22141, Japanese Laid-Open Patent No. 2-22145, and Korean Laid-Open Patent Publication No. 2003-0022553. After obtaining the composite fibers arranged in (side-by-side) form, the fibers having a uniform helical high crimpability are produced by using the shrinkage characteristics of each polymer during the relaxation heat treatment.

In addition, the cross-sectional shape is eccentric as in Japanese Patent Laid-Open Publication No. 4-136209 to solve the problem that the interface between the two components is separated by the external force applied to the fiber in the post-spinning process due to the low compatibility between the polymers. It has also been proposed to use sheath-core. However, the above methods are inferior in physical properties of the yarn itself due to heterogeneous polymers having different physical properties, and are likely to cause problems such as dyeing of fabrics and dyeing lines during post-processing.

In addition, in order to improve the compatibility of the two components Korean Patent Laid-Open Publication No. 2001-0073328 discloses a method of complex spinning so that the cross-section of the filament is made of side by side using two in situ polymers having different viscosity difference have.

The composite fiber produced by the above method exhibits a coil-like crimping performance due to the difference in shrinkage stress due to the viscosity of the polymer during the relaxation heat treatment. However, if the method maximizes the difference in viscosity between the positive fractions for the purpose of maximum crimping effect, it is impossible to make stable spinning for a long time due to the deformed bending caused by the difference in shear rate and normal stress of the two polymers in the molten state. do. However, it is easy to dye and post process by using polymers of the same type, showing a unique soft touch is a method that has been used a lot recently.

On the other hand, the conventional techniques for imparting melangeon to the fiber for a natural appearance, there is a method for producing a thick yarn (thin and thin yarn) and a method for producing a yarn using a cationic salt-type polyester polymer.

In the prior art, a method for manufacturing a pomp yarn is a method of attaching and stretching a complex device that causes non-uniformity in yarn in a separate drawing process, and rotating the feed roller and the twisted plate after stretching the semi-stretched yarn and the undrawn yarn. There is a method of drawing yarns by contacting them with gears and uneven rollers.

However, such a conventional method uses a very complicated or complicated manufacturing process, resulting in poor operation, resulting in a decrease in productivity and a high manufacturing cost, resulting in a cost increase due to product production. In addition, Japanese Patent Laid-Open Nos. 55-142716 and 55-128012 propose a method for manufacturing a pomp in a direct spin-draw apparatus. The above method is highly productive due to the high-speed spinning, and it does not need a special drawing device, so it is possible to manufacture the posture by giving a difference in the drawing ratio and drawing temperature by a pair of the first high roller and the second high roller. Since the drawing point is fixed, the thick part occurs thicker and intensively, which makes it difficult to obtain high quality posture effect.

Another method for obtaining the original appearance of the melange tone is to prepare a cationic salt-type polyester yarn and composite yarn processing with a conventional polyester yarn. In the above method, the polymerization process is complicated, the strength of the yarn is lowered, the productivity is lowered through the multi-step process, and the manufacturing cost is increased, resulting in a cost increase due to product production.

On the other hand, as a method of manufacturing the yarn expressing the elasticity and melange effect by the crimping method of imparting the posture effect while partly unstretched yarn, such as Republic of Korea Patent Publication 1994-0002384, Dong 2001-0056587 and Dong 2001-0018685 There is this. However, these methods have a disadvantage in that the elasticity is somewhat lacking and the manufacturing cost is increased because the equipment itself is remodeled and installed or goes through a multi-step process. In addition, there is a method of providing a crimping characteristic and a melange effect of various colors by side-by-side composite spinning of a cationic salt-type polyester polymer and a conventional polyester polymer as in Korean Patent Laid-Open Publication No. 2001-0064272 and Japanese Patent Laid-Open No. 11-200155, It is not easy to maintain the natural appearance by the joke tea, like the poems, there is a disadvantage that it is not easy to maintain stable yarn properties and the manufacturing cost increases.

The present invention satisfies both the melange effect of the general poise yarn and the elasticity and bulkiness of the dry touch and the potential crimp, and has an elegant color tone and soft touch feeling while having an appearance similar to the spun yarn during weaving-processing. The present invention seeks to provide a latent crimped polyester posture yarn with excellent resilience and feel.

In addition, the present invention is to provide a method for producing a potential crimped polyester posture yarn that does not require a separate equipment modification or additional equipment, and can prevent time and cost loss due to multi-stage machining.

To this end, in the present invention, when producing two types of polyester polymers having different intrinsic viscosity characteristics from each other in the form of side-by-side complex spinning to produce a latent crimped polyester posture yarn, at the same time adopting a radial direct drawing method The stretching conditions are set so that the stretched part (detail) and the unstretched part (fetal part) are alternately and repeatedly arranged in the company.

The latent crimped polyester posture of the present invention for achieving the above problems, the two polyester polymers having a difference in intrinsic viscosity of 0.5 ~ 2.0 is compounded in the form of side by side on the yarn cross-section, yarn length direction The thicker the finer the finer the finer the finer the finer the finer the finer the finer the finer the finer the finer the finer the finer the finest the finest the period, the maximum value (Pmax) of the period on the spectrogram graph obtained when the yarn is measured. It is characterized by appearing.

In addition, the method for producing a latent crimp polyester according to the present invention is a continuous process of two polyester polymers having a difference in intrinsic viscosity of 0.5 to 2.0 in one continuous process. After discharge through the composite spinneret (1) at a radiation temperature of 280 ~ 295 ℃ as possible, (ii) continue to cool and solidify with the cooling unit (2), and then refuel with the oil supply unit (3), (i) Subsequently, the first gourd roll 4 having a temperature of 50 to 70 ° C. and a linear speed of 1,800 to 2,800 m / min, and a temperature of 85 to 110 ° C. and a linear speed of 1.4 to 2.0 times the linear speed of the first gourd roll. It is characterized by winding after passing through the two rolls (5) one by one.

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

The latent crimped polyester posture yarn of the present invention (hereinafter abbreviated as "yarn of the present invention") is composed of two polyester polymers having different intrinsic viscosity characteristics on a yarn cross section in a side by side form. It has a form.

The difference in intrinsic viscosity between the polyester polymers is 0.5 to 2.0.

If the difference in intrinsic viscosity is less than 0.5, crimp expression is difficult during boiling water shrinkage, and if it exceeds 2.0, extreme curvature occurs in the lower part of the detention, and thus the operationability is deteriorated.

It is preferable that the cross-sectional area ratio of the high intrinsic viscosity component and the low intrinsic viscosity among the polyester polymers in the yarn cross section is 30 to 70:70 to 30.

In other words, it is preferable that the ratio of the cross-sectional area of each component to the total cross-sectional area of the yarn is 30% or more.

When the ratio of the cross-sectional area of the component having a relatively high intrinsic viscosity is less than 30%, sufficient crimping performance is not expressed during boiling water shrinkage, and when the cross-sectional ratio of the component having a relatively low intrinsic viscosity is less than 30%, the crimp expression is insufficient. Elasticity may be lowered. It is preferable for the elasticity improvement that the cross-sectional area ratio of the cationic component is 50:50.

In addition, the yarn of the present invention is a portion (part) in which the fineness is relatively thick (part) and the portion (detail) relatively fine in the longitudinal direction is repeated alternately, as shown in Fig. 2, the tester (USTER TESTER: switch The maximum value of the period (Pmax) is shown in the wavelength range of 3 to 15 cm on the spectrogram graph obtained when measuring the uniformity of yarn with Zellweger Uster.

Fig. 2 is a graph of the above-mentioned sterogram.

If the wavelength range of maximum period (Pmax) is less than 3cm, the placenta is too short and the frequency of appearance is not sufficient to obtain a sufficient posture effect.If it exceeds 15cm, the length of the placenta is long and concentrated, resulting in poor quality. Can be.

Yarn of the present invention is alternately repeated with about 5 to 35 of each part and detail per 1m length.

The cross-sectional area of the bow is 1.2 times larger than the cross-sectional area of detail.

Even when the cross-sectional area of the fetus is less than 1.2 times the detailed cross-sectional area, the shade difference due to the posture effect is not well expressed.

In addition, the yarn of the present invention has a crimp rate of 30 to 60%.

Next, look at in detail the manufacturing method of the present invention.

In the present invention, the two types of polyester polymer having a viscosity difference of 0.5 to 2.0 are combined in one continuous process as shown in FIG. Prepare an ester placeca.

1 is a process schematic diagram of the present invention.

Specifically, in the present invention, two kinds of polyester polymers having a difference in intrinsic viscosity of 0.5 to 2.0 in a continuous process (i) at a spinning temperature of 280 to 295 ° C. such that the cross section of the yarn becomes a side by side shape. After discharging through the composite spinneret (1), (ii) it is continuously cooled and solidified by the cooling device (2), and then lubricated by the oil supply device (3). Drawing is carried out through a first gourd roll (4) having a linear speed of 1,800 to 2,800 m / min and a gourd roll (5) having a temperature of 85 to 110 ° C and a linear speed of 1.4 times to 2.0 times the linear speed of the first gourd roll. After that, (i) the winding is characterized by producing a latent crimped polyester posture yarn.

The draw ratio between the first gourd roll 4 and the second gourd roll 5 is 1.4-2.0.

At this time, when the temperature of the first gourd roll 4 is less than 50 ° C., it is cut off due to excessive tension in the drawing section, and when it exceeds 70 ° C., thermal drawing occurs, thereby reducing the posture effect. If the linear velocity of the first gourd roll is less than 1800 m / min, it is not only stable in productivity but also not stable to alkali loss, and if it exceeds 2800 m / min, the stretching effect is increased and sufficient posture effect cannot be obtained. And if the temperature of the second gourd roll (5) is less than 85 ℃ is disadvantageous to heat setting, and if the temperature exceeds 110 ℃, the posture effect is reduced by high temperature heat treatment and the trembling of the yarn is largely unstable in the process. In addition, if the draw ratio between the first gook roll and the second gook roll is less than 1.4, it is not possible to secure stable raw material properties such as a decrease in strength, and if the draw ratio exceeds 2.0, the posture effect decreases, and the color difference due to the sufficient posture effect during dyeing is reduced. Can't get

The present invention does not require a separate equipment modification or addition in the manufacture of poems to obtain a natural appearance through the melange tone, it needs to undergo a separate processing process for the crimping performance to obtain elasticity, resilience, volume This reduces the cost and time lost of each process. In addition, it is also possible to solve the problem of deterioration of the fabric quality due to the thick and long intensive development of the constriction of the Taesa manufactured by the direct radiation drawing method. In addition, it can produce a fabric having a natural melange tone appearance, deep color, and volume without compromising the texture of the material even if it is instructed, instructed, or altered with other materials.

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

Composite spinning of polyester polymer (A) with an inherent viscosity of 0.52 and polyester polymer (B) with an intrinsic viscosity of 0.64 at a temperature of 288 ° C. in a direct radiation drawing method as shown in FIG. It was.

At this time, the cross-sectional ratios of the polymer (A) and the polymer (B) on the distal end face were 50%.

Subsequently, the radiated matter was cooled and solidified by the cooling device 2 and then lubricated by the oil supply device 3.

Subsequently, the first gourd roll 4 having a temperature of 60 ° C. and a linear speed of 2,000 m / min, and a second gourd roll 5 having a temperature of 90 ° C. and a linear speed of 1.8 times faster than the first gourd roll 1.8 are sequentially passed. After drawing at a draw ratio of the ship, and then chopped to prepare a yarn of 100 denier / 48 filaments.

By using the yarn as a warp and weft yarn 8 times the main fabric was manufactured, and refined, reduced, reduced alkali (20%) and dyed to prepare a processed paper.

The results of evaluating various physical properties of the manufactured yarn and processed paper are shown in Table 2.

Examples 2 to 3 and Comparative Examples 1 to 2

The yarn and its processed paper were prepared in the same manner as in Example 1 except that the intrinsic viscosity of the polyester polymers, the temperature and linear velocity of the first gourd roll, the temperature and the draw ratio of the second gourd roll were changed as shown in Table 1.

The results of evaluating various physical properties of the manufactured yarn and processed paper are shown in Table 2.

Manufacture conditions division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Intrinsic viscosity of polymer (A) 0.52 0.50 0.52 0.58 0.50 Polymer (B) Intrinsic Viscosity 1.12 1.50 1.64 0.62 0.68 1st goth roll temperature (℃) 60 65 55 60 50 First high roll roll speed (m / min) 2,000 2,400 1,800 2,000 3,000 2nd goth roll temperature (℃) 90 100 90 90 120 Extension ratio (times) 1.8 1.6 1.9 1.8 1.4

Property evaluation result division Elongation (%) Shrinkage (%) Crimp Rate (%) Wavelength of Pmax period (cm) Posture Fabric touch and appearance Example 1 82 54 52 7 1.80 Great Example 2 88 68 48 6 2.20 Great Example 3 66 48 37 12 1.60 Great Comparative Example 1 71 71 15 18 1.14 Good Comparative Example 2 46 38 21 2 1.10 usually

In the present invention, the properties of the yarn and processed paper were evaluated by the following method.

Shinto

The measurement is performed according to JIS L-1090. An Instron Model 4201 instrument is used at an elongation of 20 cm / min for a 20 cm length sample at an initial load of 0.088 x dtex cN. Elongation is defined as the percent elongation at maximum

Shrinkage and Crimp Rate

First, a skein is made with 10 turns of denier krill (the tension at the time of winding is displayed fineness x 1 / 10g). I put super load (display fineness * 1 / 25g) and static load (display fineness * 2g) on a thread and length Measure (L ₀ ). After heat treatment for 15 minutes in water at 100 ℃ and then pulled out to remove the water with a moisture-absorbent paper and left in the room for 12 hours, and then measured the length of the super load and static load (L ₁ ). This is left for 2 minutes in water (20 ℃ ± 2 ℃) and the length of the sample is measured (L ₂ ). Remove the static load, leave for 3 minutes and measure the length of the sample (L ₃ ). Shrinkage rate and crimp rate are calculated by the following equation.

The wavelength at which the maximum of the period (Pmax) appears;

Using a Uster Tester (Model-UT3C from Zellweger Uster, Switzerland), measure the flux at 100 m / min for 2.5 minutes and measure the wavelengths corresponding to the maximum values on the unevenness (U%) and spectrogram, respectively. The measured value is an average of three measurements.

Postage fee

Measure the diameter of the placenta and the diameter of the details with a canine microscope, and substitute the measured values into the following equation to calculate the posture ratio.

Posture = diameter of the part / diameter of the part

Fabric appearance and feel

It is evaluated by the sensory test of 10 experts. It is good if more than 9 out of 10 experts judge that appearance / feel is good, it is good if 7-8 judges good, and if it judges 5-6 good, it is normal, and if 4 judges good, poor Each was separated.

The latent crimped polyester posture yarn of the present invention is excellent in elasticity, resilience characteristics and volume feeling due to the crimping effect in the manufacture of knitted fabrics, and at the same time, it is useful as a yarn for clothing by expressing a natural appearance due to the melange effect.

In addition, the present invention can produce a potential crimped polyester posture yarn without the addition or modification of additional equipment, it is possible to omit a separate machining process to reduce the manufacturing cost and simplify the process.

Claims (5)

Two kinds of polyester polymers with a difference in intrinsic viscosity of 0.5 to 2.0 are compounded in the form of side by side on the cross section of the yarn. It is repeated repeatedly, the latent crimped polyester poem yarn, characterized in that the maximum value (Pmax) of the period appears in the wavelength range of 3 ~ 15cm on the spectrogram graph obtained when measuring the uniformity of the yarn. The latent crimped polyester poised yarn according to claim 1, wherein the ratio of the cross-sectional area between the two polyester polymers in the yarn cross section is 30 to 70:70 to 30. The latent crimped polyester poised yarn according to claim 1, wherein the cross section of the bow is 1.2 times larger than the cross section of the detail. The latent crimped polyester poised yarn according to claim 1, wherein the crimp rate is 30 to 60%. Two kinds of polyester polymers having a difference in intrinsic viscosity of 0.5 to 2.0 in one continuous process: (i) Composite spinning caps at a spinning temperature of 280 to 295 ° C so that the cross section of the yarn becomes a side-by-side form (1) After discharged through (ii), it is continuously cooled and solidified by the cooling device (2), and then lubricated by the oil supply device (3), and then (i) the temperature is 50 to 70 ° C. and the linear velocity is 1,800 to 2,800. After stretching through a first goth roll 4 at m / min and a second goth roll 5 having a temperature of 85 to 110 ° C. and a linear speed of 1.4 times to 2.0 times the linear speed of the first goth roll, Iii) a method for producing a latent crimped polyester posture yarn characterized by winding.

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