KR100221668B1 - Solvent texturing processing of synthetic filament - Google Patents

Abstract

The present invention is a new texturizing method which utilizes the working principle of a solvent for a synthetic filament yarn.

In general, synthetic fiber filament yarn has many problems such as poor bulky property, low heat resistance and flexibility, and low gloss. Accordingly, there have been developed a variety of texturing methods for imparting the same effect as filament yarn by imparting crimp to a conventional smooth filament. That is, a gear-crimp method, a stuffer-box method, a false-twist method, an edge-crimp method, a knit-de -knit method, an air-jet method, and the like. Most of them have the problem that they are not natural due to the regularly formed crimp, but also the complexity of the process such as heat fixation after crimping and energy waste, .

However, in the present invention, when various synthetic fiber filaments commonly used such as nylon and polyester are treated with a specific solvent having a very high solvency for a very short time of less than 15 seconds, The shrinkage action of the fiber by the solvent takes place first rather than the speed, and as a result, the degree of shrinkage in the fiber length direction within one fiber cross-sectional area becomes uneven, resulting in crimp in the longitudinal direction of the fiber We have developed a new texture processing method and decided to call the texture processing method based on this principle "Solvent-Texturizing".

The contents of the present invention will be described in detail as follows. (For example, formic acid in nylon fiber and m-cresol in polyester fiber) is selected for various synthetic fiber filament yarns to prepare an aqueous solution or mixed solution having a concentration of 50 to 100% The filament yarn is treated with a filament yarn for a very short time of less than 15 seconds to generate crimp, and then the solvent is immediately removed with a washing solution, followed by drying. By this treatment, unevenness in the longitudinal direction is generated in each filament constituting the yarn, and as a result, the yarn is given a component property as a result of the "solvent-texturing method".

The characteristic effects of the machining process as described above are as follows. First, since the formed crimp shows irregular size or shape, it shows a natural effect compared to the product by the conventional method. Second, because the process is simple and the time required is very short, productivity is much higher than the conventional method. Third, since the setting effect is achieved at the same time as the formation of the crimp by the action of the solvent, the heat fixing process in the existing process is not necessary, so there is an energy saving effect (the solvent can be recovered and reused) The dyeing property of the product is also improved because the effect of increasing the dyeing property by the solvent action is generated at the same time.

Description

The "Solvent-Texturizing" process of synthetic filament yarn

The present invention relates to a process for treating a fiber of a synthetic fiber filament yarn commonly used in nylon, polyester or the like with a specific solvent excellent in solvency for a very short time, This is a new texture processing method in which uneven shrinkage occurs in one fiber cross-sectional area and consequently crimp occurs in the longitudinal direction of the fiber.

In general, the synthetic fiber filament yarn has many problems such as insufficient warmth and flexibility due to poor bulky properties of the product compared to a spun yarn, and too many parallel reflected light, resulting in a low gloss. Accordingly, there have been developed a variety of texturing methods for imparting the same effect as a spun yarn while imparting a crimp to a conventional smooth filament. That is, a gear-crimp method in which filaments are passed through a pair of gears engaged with each other to give a crimp, a filament yarn is piled up in a box of a certain shape and size, A stuffer-box method of applying crimp, a false-twist method of giving a crimp to a filament yarn after giving a twist to the filament yarn, a knit-de-knit method in which a crimp is imparted by making a knit with a filament yarn and then loosening the knit, Air-jet method in which air is sprayed at a high speed from the side while the filament yarn passes by to cause the fibers to become wrinkled and crimp, and most of them are crimped to the filament by a mechanical method, And are permanently fixed by heat-setting.

Among them, most of them except the air jet method, the chill method, and the like have a problem that the formed crimp is regular and not natural, and the methods other than the air jet method have problems such as the complexity of the process It has the disadvantage of consuming a lot of time and expense in the processing process because there is an energy wasting factor together. In recent years, some researchers have proposed solvent-setting methods instead of thermal fixation.

However, in the present invention, when various synthetic fiber filament yarns are treated with a specific solvent having a very high solvency for a very short time of less than 15 seconds, The shrinkage of the fiber occurs first, and as a result, the degree of shrinkage in the longitudinal direction of the fiber in one fiber cross-sectional area is unevenly generated, resulting in a crimp in the longitudinal direction of the fiber. And the texture processing method based on this principle was called "Solvent-Texturizing".

The contents of the present invention will be described in detail as follows.

(For example, formic acid in nylon fiber and m-cresol in polyester fiber) is selected for various synthetic fiber filament yarns to prepare an aqueous solution or mixed solution having a concentration of 50 to 100% , The filament yarn is treated for a very short time of less than 15 seconds to generate crimp, and then the solvent is immediately removed with a washing solution, followed by drying. (Refer to "Examples" for specific details.) Unevenness in the longitudinal direction is generated in each filament constituting the yarn by this treatment, and consequently, the yarn is imparted with a component property, "to be.

[Example 1]

Nylon 6 filament yarn (70d / 24fils, trilobal) was treated in a 60% aqueous solution of formic acid for 3, 9, and 12 sec, respectively, while maintaining the temperature at 30 ° C, and then washed thoroughly with water and dried.

These samples were observed with an optical microscope and a scanning microscope, and the crimp ratio and tensile strength were measured using a tensile tester. Dyeing with a disperse dye was carried out and the results were as follows .

As a result of the observation by side view by optical microscope in Fig. 1, the irregular shape of the crimp is generated and the texture processing effect is exhibited, and it can be seen that the processing effect is better at 9 seconds or more than the processing time of 3 seconds.

[Figure 1]

Microscopic photograph of nylon 6 yarn and processed yarn

On the other hand, Fig. 2 shows the cross section of the samples by scanning electron microscope. In this case, the yarns exhibit a very uniform triangular shape, whereas the cross-sections of the processed yarns are not regular in shape, and a certain lobe is long and toxic, which is a considerably distorted form. As a result, it was confirmed that the phenomenon of swelling and shrinkage caused by the solvent in the same cross section, which is the above-mentioned crimp generation principle (described above), is indirect but indirect.

[Figure 2]

Cross-section photograph of nylon 6 yarn and processed yarn by scanning electron microscope (magnification 1000 times)

The table shows the crimp rate, tensile strength, and salt loading, which indicate the degree of crimp formation.

It can be seen here that the crimp rate is larger at 9 seconds than at the processing time of 3 seconds, and the crimp rate is slightly decreased at 12 seconds. In the case of the processed yarns, the amount of the dye is much larger, and it can be seen that there is an advantage that the dyeing property is also improved accompanied with the processing by the present method. Although the tensile strength is considerably reduced, it is generally considered that the texture is used mainly for the manufacture of clothing cloth, and in particular, since it is widely used for the use of fabric.

[Example 2]

The polyester filament yarn (50d / 96fils., Trilobal) was treated with m-cresol (purity 85%) at a temperature of 60 ° C for 3 seconds, 9 seconds, 12 seconds and then sufficiently washed with water and dried.

The microscopic observation results of this sample are shown in Fig. 3, which shows similar effects to the case of nylon 6 above.

[Figure 3]

Microscope photograph of polyester yarn and processed yarn

The characteristic effects of the machining process as described above are as follows.

First, since the formed crimp shows irregular size or shape, it shows a natural effect compared to the product by the conventional method.

Second, because the process is simple and the time required is very short, productivity is much higher than the conventional method.

Third, since the setting effect is obtained at the same time as the formation of the crimp by the action of the solvent, the heat fixing process in the conventional process is not necessary, so there is an energy saving effect (the solvent can be recovered and reused)

Fourth, since dyeing effect by solvent action is simultaneously generated during the processing step, dyeability of the product is also improved.

Claims (1)

A synthetic fiber filament yarn is treated with a 50-100% aqueous solution of a solvent having a high dissolving power for a time of less than 15 seconds, so that the contraction action takes precedence over the penetration speed of the solvent, (Solvent-Texturizing) method characterized in that uneven shrinkage is generated in the longitudinal direction of the fiber so that a crimp is generated in the longitudinal direction of the fiber.