KR20080104703A - Polyester hollow yarn with high tear strength and anti abrasion and method of manufacturing the same - Google Patents

Abstract

A manufacturing method of polyester hollow fiber having a superior internal tearing strength and a superior abrasion resistance is provided to have a high hollow ratio, an excellent lightness, an excellent heat insulation property, an excellent internal tearing strength, an excellent tensile strength and an excellent abrasion resistance. A manufacturing method of polyester hollow fiber having a superior internal tearing strength and a superior abrasion resistance comprise a step of radiating polyethylene terephthalate resin melt of which an inherent viscosity(IV) is 0.7~1.2 through a spinneret consisting of two or more discharging slits arranged each other. The radiated unstretched fiber is extended at a stretching ratio of 1.5~3.0.

Description

Polyester hollow fiber with high tear strength and wear resistance {Polyester hollow yarn with high tear strength and anti abrasion and method of manufacturing the same}

1 (a) to (c) is a cross-sectional view of the spinneret used in the present invention.

Figure 2 is a cross-sectional picture of the polyester hollow yarn in the present invention

Figure 3 is a cross-sectional photograph of a polyester hollow yarn exceeding 50% of the hollow ratio.

The present invention relates to a polyester hollow fiber and a method for manufacturing the same, and more particularly, to a polyester hollow fiber and a method for producing the polyester hollow fiber having a high hollow ratio and good light weight, excellent tear strength and wear resistance.

Hollow yarn is a technology that is so old that a basic patent has already been filed in 1956. The advantage of hollow yarn is that it can feel light weight due to the reduced weight due to the reduced weight for the hollow portion. In addition, since air is present in the hollow portion, heat retention of the air can be maintained by using a low thermal conductivity of air. The purpose of providing thermal insulation to the garment as a fiber aggregate was to obtain a light, thin and excellent thermal insulation material. Therefore, as the weight of winter clothing becomes thicker, the weight is increased, and the hollow fiber is often used to solve the disadvantage that the insulation is inferior when the weight is reduced.

In the method of manufacturing the hollow yarn, as shown in Fig. 1 (a) ~ (c) by using a spinneret composed of two or more slits arranged apart from each other by fusing the polymer melt directly under the spinneret to solidify, including the outside air, There are two main methods of dissolving and removing one component after complex spinning. In the case of composite spinning, one component of the two-component polymer is eluted, and the hollow is maintained even after processing, and the hollow ratio is freely controlled by adjusting the amount of the polymer in the core part up to 20 to 60%. This is how you can adjust. In addition, even if twisted and twisted, the polymer present in the elution portion (hollow portion) has the advantage that the deformation of the hollow portion, that is, the bonding phenomenon does not occur. However, the dissolution of the polymer is high, the manufacturing cost is high, and because of the elution process has a disadvantage that a lot of processing costs occur. In addition, the polyester component in the eluted polymer has a problem in environmental pollution because it uses an alkaline solution such as sodium hydroxide. Therefore, the general hollow fiber manufacturing method is to discharge the polyethylene terephthalate polymer of intrinsic viscosity (IV) 0.6 ~ 0.67 through a spinneret composed of two or more slits arranged apart from each other as shown in Figure 1 (a) ~ (c) It is a common method to make the hollow by incorporating the outside air into the center by fusion before the solidification.

The most important factors in manufacturing hollow fiber in this way are the shape of the discharge hole in the spinneret, the cooling method of the polymer, the draft ratio according to the spinning speed, and the spinning temperature. Among them, the form of detention eventually determines the form of hollow yarn.

Specifically, the cross section of the hollow yarns is greatly influenced by the number of slits in the form of detention. In the case of C type with one slit, the air flow rate into the space between the slits is small, so the hollow rate is not high.In the case of the two-slit hollow bracket, the slits are symmetrical with each other, Since it is located in the symmetrical part, the hollow part takes an elliptical shape in the yarn cross section after spinning, and has a disadvantage of being easily distorted by external force. On the other hand, if the slit is composed of three to four, the inflow of air is appropriate, but if the interval between the slits is not appropriate, the hollow is not formed, so the occurrence of the cross-section flattened form is frequent. To solve this problem, a slit at the end of the slit may be used to concentrate the polymer flow.

Because of these problems, the design of hollow detention is difficult and, moreover, it is an obstacle to manufacturing high hollow fiber hollow fiber.

Even in the case of designing the optimum hollow block by solving the above problems, in the case of the high hollow fiber hollow yarn, the outer wall of the yarn is thin, so the wear resistance, tensile strength and tear strength in the fabric are low. In addition, when the fineness is reduced to reduce the weight, the tendency becomes more severe, and the higher the hollow ratio, the lower the wear resistance of the yarn. For apparel, it is not a problem because it does not require high wear resistance and tearing, but in the case of bag paper or shoe paper which requires light weight and durability, the application of hollow yarn is limited to the inner skin. Lightweight is the biggest issue in bags and shoes, and the application of hollow yarns is essential. However, in the case of bag paper and shoe paper, wear and tear are the main characteristics that are rarely used. In the case of clothing, the jacket with light weight has a low tear strength and is easily torn in extreme sports or extreme sports activities, and is used for climbing and leisure.

The present invention is to provide a polyester hollow fiber having a high hollow ratio and excellent in light weight and thermal insulation, and also excellent in tear strength, tensile strength and wear resistance.

In addition, the present invention is to provide a method for producing a polyester hollow fiber having the above physical properties by appropriately adjusting the intrinsic viscosity (IV) and the draw ratio of the polyethylene terephthalate resin at the time of polyester hollow fiber production.

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

In the method for producing a polyester hollow yarn according to the present invention, as shown in Figs. 1 (a) to (c), two or more discharged polyethylene terephthalate resin melts having an intrinsic viscosity (IV) of 0.7 to 1.2 are arranged apart from each other. After spinning through the spinneret consisting of slits, characterized in that the stretched non-drawn yarn at a draw ratio of 1.5 ~ 3.0.

1 (a) to 1 (c) are cross sectional views of the spinneret used in the present invention.

In addition, the polyester hollow yarn according to the present invention is made of a polyethylene terephthalate resin, the hollow ratio is 30 to 50%, the strength is 4.5g / d or more, elongation is characterized in that 25 to 40%.

First, referring to the manufacturing method of the present invention, in the present invention, after adjusting the intrinsic viscosity (IV) of the polyethylene terephthalate resin used in the manufacture of polyester hollow fiber to 0.7 to 1.2, more preferably 0.8 to 1.0, The undrawn yarn is discharged by spinning through a spinneret composed of two or more discharge slits arranged apart from each other, such as 1 (a) to (c).

If the intrinsic viscosity (IV) is less than 0.7, the viscosity of the polymer as the discharge slit hole is formed to be low by the shear rate from the discharge hole wall surface, so that the hollow portion does not maintain the form of the hollow portion, and the hollow ratio is lowered. In addition, when the intrinsic viscosity (IV) exceeds 1.2, the hollow part is opened due to the too high viscosity or the hollow ratio is formed to exceed 50% as shown in FIG. In various forms.

It is very difficult to control the polyethylene terephthalate resin viscosity in the discharge hole. Viscosity at the time of discharge is better, but the reduction of the shear stress and the discharge amount is subject to the constraints on the discharge rate and take-up speed. Lowering the spinning temperature to increase the viscosity has a limitation because of poor operation. Therefore, by adjusting the intrinsic viscosity (IV) of the polyethylene terephthalate resin, the viscosity at the time of discharging can be increased, and the hollowness is increased due to the more relaxation time to recover from the hollow form by the viscoelastic force before being completely solidified after discharging. It is advantageous for the high-hollow hollow formation of 30 to 50%. In addition, high tensile strength and high modulus in the final yarn produced increases the wear resistance and tear strength in the final fabric. The higher the intrinsic viscosity (IV), the longer the length of the polymer chain, the higher the crystallinity, the higher the strength, the longer the bond length between the carbon has abrasion resistance to friction. In addition, the formed hollow is light in weight as much as the size of the hollow part, and because the amount of air contained due to the high hollow ratio is increased, the heat retention is increased, which can reduce the weight of heavy fabrics such as tents and tents. It can exhibit the warming effect.

Next, the unstretched yarn spun as described above is stretched at a draw ratio of 1.5 to 3.0 using a plurality of stretching rolls. The higher the hollow ratio, the smaller the draw ratio is, so that it is difficult to exceed the draw ratio by 3.0. If the draw ratio is less than 1.5, insufficient drawing results in poor physical properties such as tear strength.

When the total fineness of the hollow yarn is 150 denier or less, it is preferable to use two stretching rolls, and when the total fineness is 200 to 500 denier, it is preferable to use three stretching rolls.

70-85 degreeC is suitable for the temperature of a 1st extending | stretching roll, and it is suitable that the temperature of a 2nd extending | stretching roll and a 3rd extending | stretching roll is 120-200 degreeC.

Polyester hollow yarn prepared as described above has a hollow ratio of 30 to 50%, strength of 4.5 g / d or more, elongation of 25 to 45%, total fineness of 30 to 500 denier, and single yarn fineness of 2 to 10 It is preferable that it is denier.

If the single yarn fineness is less than 2 denier, the wear resistance is lowered. If the single yarn fineness is more than 10 denier, the solidification point is long during spinning and uneven cooling may result in frequent cutting.

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  One

After the polyethylene terephthalate resin melt having an intrinsic viscosity (IV) of 0.75 was spun through a spinneret composed of two discharge slits as shown in FIG. 1 (b), the undrawn yarn was spun at a draw ratio of 2.2 between the two draw rolls. The polyester hollow fiber of 150 denier / 68 filament was prepared by stretching and heat setting and winding in the second stretching roll at 130 ℃.

Next, weaving a plain fabric using the prepared polyester hollow fiber as a warp and weft yarn and then fabricated through a dyeing and tenter process.

The results of evaluating various physical properties of the prepared polyester are shown in Table 2, and the results of evaluating various physical properties of the manufactured fabric are shown in Table 3.

Example  2 to Example  3 and Comparative Example  1 to Comparative Example  3

A polyester hollow fiber and its fabric were prepared in the same manner as in Example 1, except that the intrinsic viscosity (IV), the stretching ratio, the number of rolls of rolls, and the temperature of the last roll of rolls of polyethylene terephthalate were changed as shown in Table 1. .

The results of evaluating various physical properties of the prepared polyester are shown in Table 2, and the results of evaluating various physical properties of the manufactured fabric are shown in Table 3.

Manufacture conditions division Polyethylene terephthalate intrinsic viscosity (Ⅳ) Elongation ratio Stretch roll count Final drawing roll temperature (℃) Example 1 0.75 2.2 2 130 Example 2 0.80 2.4 2 130 Example 3 1.00 2.5 Three 150 Comparative Example 1 0.65 2.0 2 120 Comparative Example 2 0.65 3.2 2 120 Comparative Example 3 0.80 3.5 Three 150

Yarn Evaluation division Strength (g / denier) Elongation (%) Hollow rate (%) Example 1 6.0 31 31 Example 2 6.2 28 34 Example 3 6.8 27 38 Comparative Example 1 4.0 33 16 Comparative Example 2 4.5 35 0 Comparative Example 3 6.8 20 0

Fabric Evaluation division Thermal insulation rate (%) Tear strength (kg) Wear resistance (times) Weight (g / yd) Example 1 12 4.0 155 140 Example 2 13 4.5 170 136 Example 3 15 4.8 190 124 Comparative Example 1 8.8 2.5 86 170 Comparative Example 2 8.2 3.2 90 203 Comparative Example 3 8.1 5.0 207 207

Various physical properties in the present invention were evaluated by the following method.

· Hollowness (%)

After measuring the yarn cross section, the hollow ratio is calculated as follows, and the average of 36 filament hollow ratios is calculated.

Wear resistance

Measured using a stall multipurpose friction tester.

The test piece was 10.8cm in diameter, gripped on the clamp on the rubber film, and adjusted to a pressure of 0.0028kg / mm2 of the rubber film. Then, sand paper # 320 was placed on the friction wheel and the load applied to the friction wheel was 500g. To be. Then, the number of times until the bottom of the fabric is visible by friction is measured.

Thermal insulation

Measured based on KS L 0560.

· Tear strength

It is measured based on the tongue method (KSK 0536).

The present invention possesses a high hollow ratio and is excellent in light weight and thermal insulation, and also excellent in tear strength, tensile strength and wear resistance.

Therefore, the present invention is useful for the production of footwear, bags, tents, clothing for leisure as well as ordinary clothing.

Claims (4)

After spinning a polyethylene terephthalate resin melt having an intrinsic viscosity (IV) of 0.7 to 1.2 through a spinneret composed of two or more discharge slits arranged apart from each other, stretching the undrawn yarn at a draw ratio of 1.5 to 3.0. A method for producing a polyester hollow yarn having excellent tear strength and wear resistance. In polyester hollow fiber made of polyethylene terephthalate resin, the hollow ratio is 30 to 50%, the strength is 4.5 g / d or more, and the elongation is 25 to 40%. Polyester hollow fiber The polyester hollow fiber having excellent tear strength and wear resistance according to claim 2, wherein the total fineness is 30 to 500 denier and the single yarn fineness is 2 to 10 denier. A fabric comprising the polyester hollow fiber of claim 2.

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