KR100476472B1 - Method for producing bishrink horn fiber. - Google Patents

Abstract

The present invention relates to a method for producing biaxial intertwined yarn having excellent elasticity and uniformity.

In the present invention, in the production of a biaxial blended yarn by interlacing the screening and effect yarns, the screening agent uses a polytrimethylene terephthalate yarn having a birefringence of 0.055 to 0.08 and an elongation at break of 20 to 45%. Is characterized by using a polyethylene terephthalate yarn having a birefringence of 0.015 to 0.045 and an elongation at break of 90 to 170%.

Description

Method for producing bishrink horn fiber.

The present invention relates to a method for producing biaxial intertwined yarn having excellent elasticity and uniformity.

In general, bi-shrink blended yarn is manufactured by blending of low-shrink and high-shrink fibers, and it is a low-shrinkable fiber through staged heat treatment such as refining, shrinking-reducing-preliminary set-final set process in yarn or forge. By expressing the difference in shrinkage between and highly shrinkable fibers, it is used to manufacture high quality fabrics with excellent feel and volume.

As a conventional technique for producing polyester biaxially blended yarn, many methods are used in which polyester high-oriented unoriented yarn and polyester yarn spontaneously elongated on a processed paper are used as screening and effect yarns, respectively, and these are mixed with air entanglement. However, the biaxial horn fiber manufactured by the above method has the following problems.

Firstly, polyester highly oriented unstretched yarn used for screening has a higher defect rate from the yarn manufacturing stage than general stretched yarn, and there is a lot of uneven yarn quality, such as a change over time and a drum inner and outer layer difference during winding.

Secondly, the polyester highly oriented unstretched yarn is more difficult to handle than ordinary stretched yarn and is easily deformed due to slight tension or heat treatment unevenness, resulting in significant defects on the final processed paper. It is happening frequently.

Third, there is a problem in that the process permeability is lowered unless special attention is given to each process such as weaving, softening, and sizing.

Lastly, there is a problem that the product quality is deteriorated due to the high concern of color difference due to the difference in dyeability from the normal drawing yarn.

Accordingly, an object of the present invention is to solve the problems of the prior art.

The present invention is to provide a method for producing a polyester-based bishrink blended yarn having excellent elasticity and uniformity of the fabric during fabrication and good processability such as weaving.

The present invention relates to a method for producing biaxial blended yarn having excellent elasticity and uniformity and good process permeability. More specifically, the present invention is characterized in that the use of polytrimethylene terephthalate yarn having a low initial modulus and excellent elasticity and elasticity and good dyeing characteristics in the production of the biaxial horn sum yarn is used as a screening.

Hereinafter, the present invention will be described in detail.

In the present invention, in the production of a biaxial blended yarn by interlacing the screening and effect yarns, the screening agent uses a polytrimethylene terephthalate yarn having a birefringence of 0.055 to 0.08 and an elongation at break of 20 to 45%. The present invention relates to a method for producing a biaxial blended yarn, characterized by using a polyethylene terephthalate yarn having a birefringence of 0.015 to 0.045 and an elongation at break of 90 to 170%.

Polytrimethylene terephthalate yarn used as the screening in the present invention is prepared by spinning after stretching the polymer of formula (I) prepared by condensation polymerization of terephthalic acid or dimethyl terephthalate and 1,3-propanediol.

Here, n is an integer of 50-600.

In general, polytrimethylene terephthalate has a polymerization method and chemical structure very similar to that of polyethylene terephthalate, but there are many differences in thermal and mechanical properties. Polytrimethylene terephthalate is superior in polyethylene terephthalate or polybutylene terephthalate to stretch, touch, alkali resistance and dyeing. In particular, the polytrimethylene terephthalate has a relatively low initial modulus to the nylon level, has excellent elastic recovery and has a soft touch.

In particular, in the present invention, polytrimethylene terephthalate yarn having a birefringence of 0.055 to 0.08 and an elongation at break of 20 to 45% is used as the screening. If the birefringence is less than 0.055, the physical properties of blended yarns, etc. are lowered, and if it exceeds 0.08, the dyeing characteristics are lowered. In addition, when the elongation at break is less than 20%, the elasticity is lowered. When the elongation at break is more than 45%, the physical properties and fairness of the blended yarn are worsened. The single yarn fineness of the polytrimethylene terephthalate yarn is preferably 1.5 to 8 denier, and more preferably 2 to 6 denier. If the single yarn fineness is less than 1.5 denier or more than 8 denier, the physical properties of the blended yarn are worsened and the feel and elasticity are lowered.

On the other hand, in the present invention, polyethylene terephthalate semi-stretched yarn having a birefringence of 0.015 to 0.045 and an elongation at break of 90 to 170% is used as the effect yarn. If the birefringence is less than the above range, the physical properties of blended yarns, etc. are lowered, while if the birefringence is above the above range, the dyeing characteristics are lowered. In addition, when the elongation at break is less than 90%, sufficient bishrinkage effect is not expressed, and when it exceeds 170%, the sacrificial process is difficult. The single yarn fineness of an effect yarn is 2 denier or less, and it is preferable for improvement, such as a touch.

The screening and effect yarns are air entangled in an air entanglement device to produce a biaxially blended blended yarn. Although it does not specifically limit air-entanglement conditions, it is preferable to air-enterate at 1-3.5 kg of four-speed 250-500 m / min air pressures.

The present invention uses a polytrimethylene terephthalate yarn having excellent elasticity and dyeing properties as a screening, and simultaneously adjusts the cutting elongation and birefringence of the screening and effecting yarns. Has uniformity

Through the following examples look at the present invention in more detail. However, the present invention is not limited only to the following examples.

Example 1

100 denier / 192 filaments of polyethylene terephthalate semi-drawn yarn having a birefringence of 0.020 and an elongation at break of 95% are supplied as an effect yarn to an air entanglement apparatus. At the same time, 150 denier / 75 filament polytrimethylenetephthalate yarn having a birefringence of 0.060 and an elongation at cut of 25% was supplied to the air entanglement apparatus through a screening, and these were air-interlaced at an air pressure of 2 kg to form a biaxially woven fiber. Manufacture. At air entanglement, the firing speed is 400m / min.

Using the biaxially blended blended yarn as a weft yarn, a plain weave fabric having a weft yarn density of 45 × 40 patterns / cm is woven, and then processed into salt under ordinary conditions to produce processed paper. Table 2 shows the results of evaluating the physical properties of the produced biaxially blended yarn and processed paper.

Example 2 and Comparative Example 1

Except for changing the manufacturing conditions as shown in Table 1 to prepare a biaxial blended yarn and processed paper in the same process and conditions as in Example 1. Table 2 shows the results of evaluating the physical properties of the produced biaxially blended yarn and processed paper.

<Table 1> Manufacturing conditions

division Effect judge Type (denier / filament) Birefringence Elongation at break (%) Type (denier / filament) Birefringence Elongation at break (%) Example 1 PET Semi-stretched Yarn (100/192) 0.020 95 PTT (150/75) 0.060 25 Example 2 PET Semi-stretched Yarn (75/72) 0.030 150 PTT (120/24) 0.075 40 Comparative Example 1 PET Semi-stretched Yarn (75/72) 0.040 120 PET unstretched yarn (75/96) 0.065 30

<Table 2> Property Evaluation Results

division Total tactile coefficient Homogeneity Bulk Density (g / cm 3) Shout Example 1 4.2 None 0.428 Great Example 2 4.4 None 0.419 Great Comparative Example 1 3.8 plenty 0.400 usually

In the present invention, the total tactile coefficient was measured by the Kawasea system, and the elasticity was measured by Parena 5 sensory test. That is, four or more people said good grade, three people said good grade, two people said good grade, and one or less said good grade.

The birefringence is determined by attaching a barrack compensator to the polarization microscope and measuring the retardation (delay time) from the interference chromaticity by the sample and substituting it into the following equation.

Birefringence =

The present invention is excellent in process passability such as weaving and weaving. In addition, the biaxial intertwined yarn produced by the present invention is excellent in elasticity and uniformity.

Claims (2)

In manufacturing the biaxially woven fiber by interlacing the screening and effect yarns, polytrimethylene terephthalate yarn having a birefringence of 0.055 to 0.08 and an elongation at break of 20 to 45% is used as the screening, and the birefringence rate is used as the effect yarn. A method for producing a biaxially blended yarn, characterized in that a polyethylene terephthalate yarn having 0.015 to 0.045 and an elongation at break of 90 to 170% is used. The method for producing a biaxial blended yarn according to claim 1, wherein the single yarn fineness of the screening is 1.5 to 8 deniers and the single yarn fineness of the effect yarn is 2 denier or less.