KR100231196B1 - Method of preparing a lumen bulked fiber having excellent compressive recovered force - Google Patents

Abstract

The present invention is characterized in that the melt-spun using a single-component fiber-forming polymer is produced by spinning in a hollow spinneret of the asymmetrical form of the slit left, right.

One of the hollow spinnerets used in the present invention is that the left and right slits are semi-circular slits with large and small radii, and one is a curved slit and the other is a wing slit.

The present invention is a spinneret with a simple structure is excellent in crimping and compressive recovery force, no bending occurs during the spinning process, it can be produced a yarn with a large hollowness.

Description

Method for producing single component hollow spontaneous crimped fiber with excellent extrusion recovery

The present invention is a single-component hollow fiber winding crimping with excellent extrusion recovery ability to exhibit the same properties as the conventional two-component spontaneous crimping fiber by melt spinning the single component through the hollow spinneret having an asymmetric slit It relates to a method for producing a fiber.

In general, when multi-component polymers with different properties such as shrinkage are spun together to form a single fiber, a composite fiber in which a cross section of a single filament is formed into an eccentric sheath-core or side by side type Has latent crimping properties, and loose heat treatment results in uniform spiral high crimping properties.

Conventional methods for producing crimped composite fibers using this principle can be broadly classified into three types. First, a method for producing a composite fiber expressing high crimping properties by mixing them in a biaxially blending method of fibers having different shrinkage properties. (Japanese Patent Application Laid-Open No. 59-216934), second, a method of manufacturing by spinning a polymer of heterogeneous (2 성질) polymers of different properties into a single fiber (Japanese Patent Application No. 51-67421), and third, an in-situ polymer. There have been proposed methods for producing a composite fiber in which high copolymer properties are expressed by using other copolymers as first and second components, respectively (Japanese Patent Application Laid-Open No. 51-116220).

However, in the first method, the method of manufacturing a composite fiber of the bishrink mixed fiber method is a method in which the heat shrinkability is differently drawn at the time of stretching the polymer of the same composition based on the properties, and then the air is mixed to express the crimp. The process of drawing and slowing down the fiber of the air, the air entanglement composite method has a disadvantage in that the productivity is lowered. In addition, the prepared fiber has a crimp durability such as uneven appearance of crimps and poor adhesion between the fibers, resulting in separation between components and reduction of crimp characteristics due to external force applied to the fibers during the processing and post-processing processes. It has a shortcoming.

The second method, a method of producing a composite fiber composed of heterogeneous polymers, for example, a method of manufacturing a composite fiber by using a composite spinning method using polyester and polyamide, is caused by the imbalance of thermal properties and the dyeability of the positive components. Due to the low adhesion at the interface due to uneven dyeing and low compatibility between polymers, interfacial separation occurs due to external force applied after spinning. In the process of forming the hollow part by the melt viscosity difference, it is difficult to expect high repulsion and excellent compression recovery because the hollow part is eccentric and reduced (refer to FIG. 4) toward the material having a higher melt viscosity. Recently, as a way to solve the above problems due to separation between two components, it is proposed to make the cross-sectional shape of the composite yarn of two components into an eccentric sheath-core type instead of a side bisight type (Japanese Patent Application Laid-Open No. 52-124925). In this case, compared with the side-by-side type, the crimping characteristics are poor, the hollow part for improving the resilience and compression recovery force cannot be formed, the spinneret for manufacturing the fiber is complicated, and the fabrication workability is also poor.

Third, the method of manufacturing crimped composite fiber using two-component characteristic difference using in-situ copolymer is better than that of the above, but the characteristic difference between two components is increased to improve crimping. In this case, the compatibility is low, and there are problems in the weaving process such as the generation of curvature in the spinneret during spinning. Also, as in the case above, a material having a high melt viscosity in the process of forming the hollow part by the melt viscosity difference of the positive component It is difficult to expect high repulsion and excellent compression recovery because the hollow part is eccentric and reduced. In addition, spinnerets also have complex disadvantages because they are complex.

The present invention solves the problems of the prior art as described above, by spinning a single component fiber-forming polymer with a simple spinneret device to exhibit high repulsion and excellent compression recovery force by the hollow part with spontaneous high crimping characteristics At the same time, there is no curvature, and the purpose is to provide a manufacturing method excellent in spinning workability.

1A and 1B are plan views of spinnerets used in the present invention.

Figures 2a and 2b are cross-sectional views of fibers made of the spinneret above.

3 is a plan view of the spinneret used in the comparative example.

4 is a cross-sectional view of the fabric made of the detention used in the comparative example.

The present invention relates to a method for producing a single component hollow winding fiber having excellent compression recovery, and has a hollow portion in the center of the fiber, but the fiber-forming polymer is designed as a detention designed so that heterogeneous shear history is applied to one region when passing through the slit. Melt-spinning has different orientation and heat shrinkage characteristics similar to side by side hollow fiber in the longitudinal direction of the fiber. It relates to a manufacturing method characterized in that the compression recovery force is exerted.

The present invention is described in more detail as follows.

In general, the hollow spinneret for hollow use has a form of detention in which two to four curved slits are arranged at the edges of symmetrical shapes such as circular, triangular, and square, but in the present invention, a single component is used, but heterogeneous shear history on both left and right sides of the fiber is used. It is characterized by using a spinneret to arrange the left and right asymmetrical slits so that the orientation and heat shrinkage characteristics are different between the left and right. Detention slits are usually used as left and right ones as semicircular slits (1), while the other is used as a semicircular slit (2) larger than the radius of the opposite slit (FIG. 1a), or one of the curved slits. There is a method (Fig. 1B) in which (3) is used and the other is a wing-shaped slit (4).

In general, if the shape and location of the curved slit is different as shown in FIG. 1a, the upper part of the inner slit tries to maintain the same pressure on the left and right sides. Therefore, the left and right curved slits are discharged differently, so that the two sides are different from each other until the final winding. It has a draft ratio of, resulting in different orientations and thicknesses of the molecular chain.

In addition, if the tension or stress is concentrated in the thicker part in the stretching process, the thicker part is further stretched, and the thermally treated yarns having different molecular orientations have different molecular orientations. A spiral crimp is expressed.

As shown in FIG. 1B, the wing-shaped slits have a larger orientation difference than the curved slits above. In the pointed part, the shear rate is larger than that of the wing area, and thus the amount of ejection from the pointed area is much larger. As in the case, the draft ratio will be different.

In the case of FIG. 1A, the larger the difference between the radius (r ₁ ) and (r ₂ ) of the two semicircular slits, the larger the difference in the width (W ₁ ) of each slit, or the smaller the center angle (θ ₁ ) of the slit, the spontaneous winding The layering is increased and by adjusting these values it can give the desired degree of crimping. In the case of FIG. 1B, the crimping property increases as the width W ₂ of the wing-shaped slit is smaller, the size of the inner angle θ ₂ of the slit is smaller, or the length L of the slit is longer. 2a and 2b show the cross-sectional shape of the yarn produced using the spinneret of FIG.

Example 1

A polyethylene terephthalate polymer having a weight average molecular weight of 6.5 × 10 ⁴ prepared by a conventional method was melt-extruded at a temperature of 280 ° C., and the detention hole of FIG. 1a having a radius difference of 0.2 mm, a slit width difference of 0.05 mm, and a center angle of 60 ° was obtained. After spinning through 36 spinnerets, the film is wound at a constant speed to produce an unstretched filament, which is subjected to a stretching process at a draw ratio of 3.0 times and a drawing temperature of 110 ° C./190° C., followed by relaxation heat treatment. Was treated with wet heat at 80 ° C. for 5 minutes.

Example 2

As in Example 1, but using a hole with a radius difference of 0.15mm.

Example 3

As in Example 1, but the use of a detention hole of 0.2mm difference in slit width.

Example 4

As in Example 1, but using a detention hole having a central angle of 120 °.

Example 5

A slit width of 0.15 mm, a slit length of 1.5 mm, and a hole of FIG.

Example 6

As in Example 5, but the detention hole of FIG. 1b having a slit width of 0.18 mm was used.

Example 7

As in Example 5, but using a detention hole having a size of 90 ° inside the cabinet.

Example 8

As in Example 5, but using a detention hole 1.0mm in length of the slit.

Comparative Example

The first component is polyethylene terephthalate having an intrinsic viscosity of 0.85 and the second component is polyethylene terephthalate having an intrinsic viscosity of 0.52. The intrinsic viscosity of the positive component is 0.33 and the melt viscosity difference at the spinning temperature is 1,730 poise. It was. Spinnerets were used as shown in Figure 3, other conditions were prepared in the same manner as in the above embodiment.

Compression elasticity; According to KS K 2617 (Cotton Duvet Cotton Testing Method), a sample of 20 × 20 cm was used to determine the compressibility and recovery rate.

Volume recovery rate by drying; Samples were measured in a size of 20 × 20 cm according to KS K 2617 (Cotton Duvet Cotton Testing Method).

Axial number C1, C2; Take a sample of short fibers and make 10 copies of 5cm at a superload of 0.05g / d without tension as much as possible, and then magnify with a microscope to measure the super-load crimp number (inch / inch) C1. After removing and leaving for 30 seconds without tension, measure the appearance crimp C2.

Table 1 shows the properties and yarn drawing workability of the yarns prepared in Examples 1 to 8 and Comparative Examples.

TABLE 1

Yarn characteristics and spinning workability

Unlike the conventional method, the present invention avoids complicated spinnerets by using a single component, and solves the problems of curvature occurrence, deterioration of radio workability and compatibility caused by the use of two components. In addition, by having a hollow in the center of the fiber to increase the compression recovery. In addition, the present invention, when using this component in the process of forming the hollow portion due to the melt viscosity difference of the positive components, the hollowness is increased to prevent the conventional defect that the hollow portion is eccentric, shrinking toward the material with a large melt viscosity, high repulsion and excellent compression It is resilient.

Claims (1)

In melt spinning a single component fiber-forming polymer through a hollow spinneret in which the slit has a left and right non-strain type, the hollow spinneret has a curved slit (3) on one side and a wing-shaped slit (4) on the other side. Method for producing a single-component hollow spun crimped fiber excellent in compression recovery age characterized in that the.

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