KR20060087687A - Latent crimping typed polyester conjugated yarn with two component and process of manufacturing for the same - Google Patents

Abstract

The present invention relates to a latent crimp polyester bicomponent composite yarn and a method for manufacturing the same, and more particularly, to produce a bicomponent composite yarn by complex spinning two different polyester-based polymers. A terephthalate resin is used, and another component is a polytrimethylene terephthalate resin, and the above components are characterized by complex spinning and winding in a radial direct stretching method.

The latent crimp polyester bicomponent composite yarn produced by the production method of the present invention has an elongation of 30% or less, boiling water shrinkage of 10% or less, and a crimp recovery rate (measured after 180 ° C x 2 minutes of dry heat treatment) of 40%. The crimp elongation is 5% or less.

The present invention is a simple manufacturing process because the two-component composite yarn is produced by a spin-draw method.

In addition, the two-component composite yarn produced by the present invention is flat and excellent in post-process passability, such as weaving, low boiling water shrinkage rate can exhibit a good elasticity in the production of knitted fabrics.

Latent Crimp, Bicomponent Composite Yarn, Polyester, Radial Direct Stretch, Polytrimethylene Terephthalate, Post-Process Passability, Elastic.

Description

Latent crimping typed polyester conjugated yarn with two component and process of manufacturing for the same

1 is a process schematic diagram of the present invention for producing a latent crimp polyester bicomponent composite yarn.

2 is an electron micrograph showing a cross-sectional state of a conventional latent crimp type polyester bicomponent composite yarn (side by side type).

3 is an electron micrograph showing a state before heat treatment of a conventional latent crimp polyester two-component composite yarn.

Figure 4 is an electron micrograph showing a state after the hot water treatment (100 ℃) of the conventional latent crimp polyester bicomponent composite yarn.

Figure 5 is an electron micrograph showing the state before the hydrothermal treatment of the conventional latent crimp polyester bicomponent composite yarn prepared by composite spinning, winding and stretching the polyethylene terephthalate and polytrimethylene terephthalate in a poy (POY) method.

Figure 6 is an electron micrograph showing the side state before the hydrothermal treatment of the latent crimping polyester bicomponent composite yarn of the present invention prepared by composite spinning and winding polyethylene terephthalate and polytrimethylene terephthalate in a radial direct stretching method.                 

* Explanation of symbols on the main parts of the drawings

1,2 Extruder 3 Spinneret 4 Insulation part 5 Cooling part

6: Radiation heat treatment section 7: Oil ring device 8: 1st high roller

9: roller 2 10: winder

The present invention relates to a latent crimp polyester bicomponent composite yarn and a method for producing the same. Specifically, the present invention relates to a latent crimp polyester two-component composite yarn and a manufacturing method thereof having excellent latent crimpability and spontaneously becoming a spiral structure during hot water treatment to express a touch and elasticity such as natural fibers.

Synthetic fibers have a shorter history than natural fibers, and as a result of repeated technological developments, some of them have reached levels comparable to natural fibers. However, elasticity is not easily expressed by synthetic fibers and is considered to be inherent to natural fibers such as wool.

As a conventional technique for imparting elasticity to synthetic fibers, (i) a method of manufacturing bishrink composite twisted yarn by braiding, twisting and heat-fixing two kinds of synthetic fibers (yarn) having a large difference in elongation characteristics, and (ii) a knitted fabric In manufacturing, a method of mixing a polyurethane fiber and other synthetic fibers having excellent elasticity in the longitudinal direction and (i) a method of producing a composite fiber by complex spinning two kinds of polymers is known.

Among the above methods, a method for producing a biaxial composite twisted yarn is a method of imparting a potential difference in shrinkage by braiding-flamming-heat fixing two kinds of yarns having a large difference in elongation characteristics. In other words, by utilizing the difference between the strain in the flammable area and the residual strain after disintegration, the yarns in the screening and superficial yarns are relatively more deformed, leading to screening and intermingling.

The bi-shrink composite twisted yarn exhibits good elasticity due to a difference in elongation characteristics between the screening and the super yarn during heat treatment in a post-treatment process. However, this method is relatively weak because of the uneven appearance of crimping and the binding force of screening and weaving depends on air entanglement, etc. there was.

In addition, the method of manufacturing the biaxially twisted composite twisted yarn is difficult to refine the fineness because it combines two or more kinds of yarns, and the process becomes complicated and the manufacturing cost increases because the two or more kinds of yarns already produced must be dismantled and spun together. there was.

On the other hand, the method of mixing a polyurethane fiber and other synthetic fibers when manufacturing a knitted fabric has a disadvantage that is difficult to process because it is different from the physical and chemical properties of the polyurethane fiber. For example, polyester fibers are dyed with disperse dyes, while polyurethane fibers have to be dyed with acid dyes or metal dyes, since washfastness decreases significantly when dyed with disperse dyes.

Therefore, when mixing polyester fibers and polyurethane fibers in the manufacture of knitted fabrics, a chlorobenzene-based or methylnaphthalene-based dyeing carrier must be used for dyeing, and the final product is susceptible to chlorine-based bleaching agents and caustic soda. There are many problems such as being easily hydrolyzed by.

As a method for producing latent crimping yarns by complex spinning, (i) using two kinds of polymers having different viscosities and (ii) two types of polymers having different degrees of swelling with water to express crimps. There is a way.

Due to the difference in the degree of double swelling, latent crimping yarns emit polymers of the same type having different degrees of swelling by water to have a side by side cross-section to bond the two polymers at the interface. After the yarn is manufactured, it is swelled with water to express the crimp by the difference in the degree of swelling.

The above method is applicable only when the resin causing the difference in the degree of swelling by water is polymerized separately. In particular, at least one polymer should contain more ionizing groups than the other polymer to show the swelling difference.

Next, a method of producing a composite spun latent yarn using a homopolymer having different viscosities is to spin two kinds of polymers having different viscosities in the form of side by side so that two polymers having different viscosities are lengthened. After the yarns are bonded to each other at the interface in the direction, the yarns are heat-treated in a relaxed state to express the crimp in the form of a spring due to the difference in shrinkage stress due to the difference in viscosity of the two polymers.

The latent crimping yarn by the composite spinning is easy to dye and post process by using the polymer of the same type, and is a method that has been widely used in recent years, showing a unique soft touch.

As a result, the method of complex spinning two kinds of polymers having different viscosities as described above can solve the problems of various methods, and has the advantages of shortening work processability and cost reduction, and excellent elasticity and soft touch. It is widely applicable to knitting as well as woven fabrics.

In the production of latent crimps by composite spinning of two kinds of polymers having different viscosities in a side-by-side form, the radiation flux (radiation drift) between the lower jail and the first gourd roller is an important factor that determines the latent crimpability. to be.

In the case of the conventional direct-stretching method, the winding speed is 4,000 ~ 5,000m / min, but the spinning speed between the lower detention and the first gourd roller is 1,000 ~ 2,000m / min. .

Therefore, until now, two kinds of polymers having different viscosities have been spun into a side by side type to produce latent crimped composite fibers. have. Here, the POY method is a method of producing partially oriented crystallized yarn and has a radial draft of about 80 to 120.

However, when the latent crimping yarn is manufactured in the POY manner as described above, two additional stretching processes are required, resulting in a complicated process and an increase in manufacturing cost.

In addition, in the method, due to the difference in viscosity between the high viscosity polymer and the low viscosity polymer, the asymmetric swelling increases due to the shear rate and normal stress difference of the two types of polymers in the molten state, resulting in a curvature phenomenon. This phenomenon leads to a decrease in operability, which is a disadvantage in terms of production management. In addition, separate, homogeneous resins having different intrinsic viscosities must be prepared, and since the potential crimp performance can be varied depending on the intrinsic viscosity of one polymer, it is cumbersome to require special management of intrinsic viscosities. .

On the other hand, there is a method to show the potential crimp performance due to the shrinkage characteristics of the high shrink copolymer by the composite spinning and hot water treatment of the copolymer and high polymer expressing high shrinkage.

However, after fabricating the fabric using the latent crimp type bicomponent composite yarn prepared by the above method, and then forming a crimp by hydrothermal treatment, excessive shrinkage of the fabric is likely to occur due to the polymer of high shrinkage property. That is, high shrinkage yarns using high shrinkage polymers typically have a high boiling water shrinkage of about 30%. Therefore, there is a problem that excessive shrinkage occurs to reduce the width of the fabric and at the same time the thickness is thick, the touch is rough and does not meet the purpose.

On the other hand, US Patent 6,673,443 and the like discloses a method for producing a latent crimp-type two-component composite yarn by composite spinning and winding polytrimethylene terephthalate and polyethylene terephthalate, which are resins of different types, in a poy manner.

However, the method has to go through a separate two-step process of spinning and stretching, respectively, so that the process is not only complicated but also has a high boiling water shrinkage rate of the latent bicomponent composite yarns (FIGS. 3 and 4) to form a large crimp. Therefore, a lot of trimming occurs in the post-process such as knitting and weaving, and there is a problem that the operability (post-process passability) is greatly reduced.

The purpose of the present invention is to solve the conventional problems such as a latent crimped two-component composite yarn having excellent elasticity and post-process passability in a simpler process by complex spinning and winding two different types of polymers in a radial direct stretching method. It is for manufacturing.

The present invention is spontaneous three-dimensional spiral structure spontaneously when hot water treatment due to excellent crimping properties, and to produce a latent crimp polyester bicomponent composite yarn excellent in stretchability and post-process passability in a simpler process.

In the manufacturing method of the present invention for achieving the above object in the production of a two-component composite yarn by complex spinning two different polyester-based polymer, one component uses a polyethylene terephthalate resin and the other The polytrimethylene terephthalate resin is used, and the components are characterized in that the complex spinning and winding in a radial direct stretching method.

In addition, the latent crimp polyester bicomponent composite yarn of the present invention was produced by the above method, the elongation is 30% or less, the boiling water shrinkage is 10% or less, the crimp recovery rate (measured after 180 ℃ × 2 minutes dry heat treatment) is 40 % Or more, and crimp elongation is 5% or less.

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

First, in the present invention, a composite spun yarn of polyethylene terephthalate resin and a polytrimethylene terephthalate resin having different types from each other, and then stretch and heat-treat the continuously spun bicomponent composite yarn to prepare a latent crimp polyester bicomponent composite yarn. do.

Specifically, the present invention in producing a latent crimp polyester two-component composite yarn, spinning as shown in Figure 1 by using a polyethylene terephthalate resin as one component and a polytrimethylene terephthalate resin as another component The latent crimp polyester bicomponent conjugated yarn (hereinafter referred to as bicomponent conjugated yarn) is produced by a spin-draw method in which stretching and heat treatment are performed in one continuous process.

1 is a process schematic diagram of the present invention.

Two components constituting the two-component composite yarn of the present invention, that is, polyethylene terephthalate resin and polytrimethylene terephthalate resin, they are in a side by side type (Side by Side type) or a sheath / core type (Sheath / core type), etc. Compound spinning

A small amount of additives such as a matting agent and a sunscreen agent may be added to the two kinds of polymers constituting the two-component composite yarn.

The polyethylene terephthalate resin to be used in the present invention is a polyester resin used in the production of ordinary yarn for garments, and the other polytrimethylene terephthalate resin is a resin having a trimethylene terephthalate repeating unit of 90 mol% or more.                     

The cross-sectional area ratio (compared to the total cross-sectional area of the two-component composite yarns) of the two different kinds of polymers constituting the two-component composite yarns is composite spun to be 20% or more.

In other words, both the cross-sectional ratio of the polyethylene terephthalate resin and the cross-sectional ratio of the polytrimethylene terephthalate resin to the total cross-sectional area of the bicomponent composite yarn are 20% or more.

If the cross-sectional area ratio of the polytrimethylene terephthalate is less than 20%, the crimping performance of the two-component composite yarn is deteriorated, so that elasticity and resilience in fabric production are lowered.

On the other hand, when the cross-sectional ratio of polyethylene terephthalate is less than 20%, the crimping expression is difficult due to the lack of low shrinkage components, and the use amount of expensive polytrimethylene terephthalate increases, leading to an increase in manufacturing cost.

The composite spinning and cooling / solidified composite yarns are drawn between the first high roller (8) and the second high roller (9) using the linear speed difference between the rollers, and are fined by the temperature of the second high roller (9). The structure is fixed.

The rotational linear speed of the first high roller 8 is preferably 1,500 m / min to 3,500 m / min, and the rotational linear speed of the second high roller 9 is 3,800 m / min to 6,000 m / min.

The amount of winding per drum wound on the winder 10 is preferably 9 kg or less, more preferably 6 kg or less, in consideration of the shrinkage characteristic of the polytrimethylene terephthalate component, to prevent the deformation of the drum. .

In the present invention, the manufacturing process is simplified because the two-component composite yarn is manufactured by a spin-draw method instead of the POY method, which is a conventional two-step method.

In addition, since the two-component composite yarn manufactured by the present invention has a flat appearance as shown in FIG. 6, the passability of the post-process such as weaving or weaving is very excellent, and the operability is greatly improved, and the crimping performance is excellent, such as weaving, After crimping, the fine crimp is expressed on the fabric during the hydrothermal treatment, which has the advantage of expressing good elasticity and resilience.

On the contrary, the two-component composite yarn manufactured by the POY method, which is a conventional two-stage method, has a large crimp formed before the hydrothermal treatment as shown in FIG. ) Had a problem of worsening.

The latent crimp polyester bicomponent composite yarn of the present invention prepared by the method described above has an elongation of 30% or less, a boiling water shrinkage of 10% or less, and a crimp recovery rate measured after dry heat treatment for 2 minutes at 180 ° C. It is more than% and crimp elongation is 5% or less.

When the crimp elongation of more than 5%, the crimp of the yarn itself is increased, so the tension in the sea must be carefully managed and the post-process passability is reduced.

In addition, when the above elongation is more than 30%, the stretching ability is not enough, the elasticity is insufficient during fabrication.

In addition, when the boiling water measuring rate exceeds 10%, the shrinkage of the yarn is increased, and the fabric becomes thick during fabric production, resulting in poor touch.

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

Using general polyethylene terephthalate for clothing as one component, and polytrimethylene terephthalate having 95 mol% of trimethylene terephthalate repeating unit as another component, and combining them in a side-by-side form in a radial direct stretching method Spinning and winding to prepare a two-component composite yarn of 60 denier / 24 filaments.

At this time, the ratio of the cross-sectional area of the polyethylene terephthalate and the cross-sectional area of the polytrimethylene terephthalate to the total cross-sectional area of the bicomponent composite yarn was 50%, respectively, and the rotational linear velocity of the first gourd roller was 2,000 m / min and the second was The rotational linear speed of the high roller was 4,000 m / min, the draw ratio between them was 2.0 times, and the temperature of the second high roller was 140 ° C.

After weaving using the two-component composite yarn prepared as described above as warp and weft yarn, refined, reduced, reduced alkali (reduction rate: 30%), washed, dyed and processed to prepare a processed fabric.

The properties of the prepared two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.

Examples 2-5

The two-component composite yarns and fabrics were manufactured under the same process and conditions as in Example 1 except that the molar% of trimethylene terephthalate repeating units in the polytrimethylene terephthalate and the cross-sectional ratio of each component were changed as shown in Table 1 below. It was.

The physical properties of the prepared two-component composite yarns and fabrics were measured by the method described below.

Manufacture conditions division Content of trimethylene terephthalate repeat unit in polytrimethylene terephthalate (mol%) % Of cross-sectional area of each component Polyethylene terephthalate Polytrimethylene terephthalate Example 1 95 50 50 Example 2 92 40 60 Example 3 90 50 50 Example 4 90 20 80 Example 5 90 80 20

Comparative Example 1

A two-component composite yarn was prepared in the same process and conditions as in Example 1 except that polyethylene terephthalate having an intrinsic viscosity of 0.53 was used as one component and polyethylene terephthalate having an intrinsic viscosity of 0.67 was used as another component.

The properties of the manufactured two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.

Comparative Example 2

Two-component composite yarns under the same process and conditions as in Example 1 except that polytrimethylene terephthalate having an intrinsic viscosity of 0.85 was used as one component and polytrimethylene terephthalate having an intrinsic viscosity of 1.05 was used as another component. Was prepared.

The properties of the manufactured two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.                     

Comparative Example 3

The same processes and conditions as in Example 1 were used except that a high shrinkage polyester copolymerized with 13 mole% of isophthalic acid in polyethylene terephthalate was used as one component, and a general polyethylene terephthalate for clothing was used as the other component. To prepare a two-component composite yarn.

The properties of the manufactured two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.

Comparative Example 4

Instead of direct spinning, spinning was carried out in a POY manner, followed by stretching.

The spinning speed was 3,000 m / min. The stretching temperature was 180 ° C. and the stretching speed was 600 m / min.

The draw ratio was 1.4 and the residual elongation was 30%.

The properties of the manufactured two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.                     

Property evaluation results of two-component composite yarns and fabrics division 2-component composite yarn Processing fabric properties Elongation (%) Boiling Water Shrinkage (%) Crimp Recovery Rate (%) Crimp elongation (%) Elongation (%) Elongation recovery rate (%) Inclination Weft direction Inclination Weft direction Example 1 15 9 52 0.9 45 48 93 92 Example 2 18 9 50 1.2 46 49 95 95 Example 3 16 8 45 1.0 42 45 90 89 Example 4 20 9 48 1.6 52 49 95 91 Example 5 15 8 42 1.5 42 43 91 88 Comparative Example 1 35 10 10 5.8 48 47 82 86 Comparative Example 2 33 21 21 6.9 45 47 87 85 Comparative Example 3 34 35 35 12.5 38 35 80 78 Comparative Example 4 30 12 50 22.5 48 44 95 95

In the present invention, various physical properties of the latent crimp two-component composite yarn were evaluated by the following method.

Boiling Water Shrinkage (Sr) and Crimp Recovery (CR)

First, a skein is made with 10 turns of denier krill (the tension at the time of winding is 1/10 g of the display fineness). Measure the length L ₀ by attaching the initial load (display fineness x 1 / 20g) and the static load (display fineness x 2g) to the produced thread. After heat treatment for 15 minutes in water at 100 ℃, take out the water by removing the absorbent paper and left for 12 hours in the room and then measure the length with the super load and static load (L ₁ ). After standing for 2 minutes in water (20 ℃ ± 2 ℃) to measure the length of the sample (L ₂ ). Remove the static load, leave for 3 minutes and measure the length of the sample (L ₃ ). The measured values are substituted into the following equation to calculate the boiling water shrinkage ratio (Sr) and the crimp recovery ratio (CR).

Crimp elongation (E _crimp ,%)

First, a skein is made with 10 turns of denier krill (the tension at the time of winding is displayed fineness x 1 / 10g). The super thread (display fineness × 1 / 20g) and static load (display fineness × 2g) are attached to the manufactured thread Measure L ₀ .

After removing only the static load, leave for 5 minutes and measure the length (L ₄ ).

The measured value is substituted into the following equation to calculate the crimp elongation.

% Elongation of fabric

Fabric elongation is measured according to the Korean Industrial Standard KS K 0352 "Stretch Test Method for Stretch Fabrics". In other words, the tensile test is carried out using a tensile tester capable of a tensile test on the fabric. The elongation of the fabric is 20 cm so that it is stretched at a constant speed to obtain an elongation (%) where the load becomes 1.5 kgf. . Perform both inclined and weft directions, measuring five times and averaging them.                     

Elongation recovery rate of fabric (%)

The elongation recovery of the fabric is measured by KS K 0352 as in the fabric elongation. That is, it is stretched at a constant speed to the length of 80% of the elongation obtained by the above method, left for 1 minute, recovered at the same speed, left for another 3 minutes, and stretched at the same speed to the length of 80% of the elongation again. This stretch is performed 10 times and the length when the load is removed is measured and substituted into the following equation to obtain the stretch recovery rate of the fabric. Perform in both warp and weft directions, average 5 times each

However, L ₅ : length drawn up to 80% of the elongation of the fabric test piece

L ₆ : Length after removing 10 times of load after giving 10 repetitive loads

As can be seen from the above evaluation results, the latent crimping yarn of the embodiment is sufficiently low in boiling water shrinkage so that the width of the fabric can be easily adjusted, and the crimp recovery is excellent, thus making it easy to manufacture the stretchable fabric. In addition, the recovery rate of the fabric shows a very high recovery rate, there is little deformation due to the elongation of the fabric and the shape stability is excellent.

In addition, the crimp elongation is very low, and there is almost no crimp in the yarn state, and thus the process passability is extremely excellent during the post-processing such as shaving.

However, in the comparative example, crimp elongation is high and post-processing processability is very bad.

The present invention can produce a latent crimp polyester bicomponent composite yarn having excellent post-process passability, such as a knitting, in a simplified manufacturing process and expressing good elasticity in fabric / knit production.

In addition, the latent crimp polyester 2-component composite yarn of the present invention has a merit of expressing a unique fine crimp when producing a knitted fabric, giving good elasticity and expressing a soft touch and resilience.

Claims (5)

In preparing a two-component composite yarn by complex spinning two different polyester polymers, one component is polyethylene terephthalate resin and the other component is polytrimethylene terephthalate resin. A method for producing a latent crimp polyester two-component composite yarn, characterized in that the composite spinning and winding in a radial direct stretching method. The latent crimping polyester 2 according to claim 1, wherein the two components constituting the two-component composite yarn are conjugated in a side by side type or a sheath / core type. Manufacturing method of a component composite yarn. The method of claim 1, wherein the ratio of the cross-sectional area of each of the two components constituting the bicomponent composite yarn to the total cross sectional area of the bicomponent composite yarn is 20% or more. The method of claim 1, wherein the polytrimethylene terephthalate has a trimethylene terephthalate repeating unit of 90 mol% or more. A latent crimp polyester bicomponent composite yarn manufactured by the method of claim 1, characterized in that it satisfies the following properties simultaneously: -Below- Elongation: 30% or less Boiling Water Shrinkage: Less than 10% Crimp recovery rate (180 ℃ × 2 minutes dry heat measured value): 40% or more Crimp elongation: 5% or less

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