KR100490790B1 - Method for manufacturing single component hollow fiber crimped fiber using capillary cooling device - Google Patents

Abstract

According to the present invention, when a single spontaneous polyester polymer is melt-extruded with a hollow spinneret and then cooled and solidified to produce a hollow spontaneous crimped fiber, cooling air is provided on only one side of the discharge yarn immediately after spinning (prior to normal cooling treatment). It is a manufacturing method that spontaneous crimping property is expressed by causing the difference of orientation degree and crystallization size in both parts of emitting thread by spraying.

Description

Method for manufacturing single component hollow spontaneous crimped fiber using capillary cooling device

The present invention relates to a method for producing a hollow spontaneous high-stretch fiber of a single component using a capillary cooling device (see FIG. 1), wherein a cooling air is blown strongly through a capillary tube under a spinneret to By cooling only one area, it has different molecular orientation and heat shrinkage characteristics similar to the side by side hollow cross section in the longitudinal direction of the fiber, and has excellent initial bulkiness with spontaneous high crimping characteristics when relaxed heat treatment. The present invention relates to a method for producing a fiber, characterized in that to simultaneously express the compression recovery rate.

In general, when multi-component polymers with different properties, such as shrinkage, are spun together to form a single fiber, 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 fibers having different shrinkage properties in a biaxially blending method. (Japanese Patent Application Laid-Open No. 59-216934), second, a method of manufacturing by spinning a heterogeneous polymer having different properties into a single fiber (Japanese Patent Application No. 51-67421), and third, a copolymer having different properties as an in-situ polymer. A method for producing a composite fiber (one patent application No. 51-116220) and the like that has a high crimping property as a first component and a second component, respectively, has been proposed.

However, the first method above, the method of manufacturing a composite fiber of the bishrink mixed fiber method is a method to express the crimp by the air entangled composite after drawing the different heat shrinkability at the time of stretching based on the properties of the polymer of the same composition This has the disadvantage of deteriorating. In addition, the manufactured composite fibers have uneven appearance of crimps and poor adhesion between the fibers, and thus the crimp durability such as separation or reduction of crimp characteristics due to external force applied to the fibers during the processing and post-processing processes. This lacks disadvantages.

The second method, a method for producing a composite fiber composed of heterogeneous polymers, for example, a method for producing a composite fiber by using a composite spinning method using polyester and polyamide, is performed by disproportionation of the thermal properties of the nutrients and dyeing according to the difference in dyeability. Due to the low adhesion at the interface due to the non-uniformity and low compatibility between the polymers, there is a problem such as interfacial separation phenomenon due to the external force applied to the fiber after spinning, and also due to the melt viscosity difference In the process of forming the hollow portion by the hollow portion eccentric, shrinkage toward the material having a large melt viscosity (see Figure 4), it is difficult to expect high repulsion and excellent compression recovery. 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 by side shape (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 ability cannot be formed, and the spinneret device for manufacturing the fiber is complicated and the fabrication workability is also poor.

The crimped composite fiber manufactured using the same method copolymer, which is the third method using the characteristic difference of two components, has better compatibility than the above, but the characteristic difference between the two components is increased to improve the crimping ability. 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, even in the conventional method, unlike the conventional method, even if manufactured by using a conventional hollow spinning decompression high repulsion by the hollow part with spontaneous high crimp characteristics in the relaxation heat treatment process The purpose is to provide a manufacturing method that exhibits excellent compression recovery and at the same time solves the problems of bending, spinning workability and compatibility.

Hereinafter, the present invention will be described in detail.

In the present invention, a single component polyester polymer is used as shown in Figs. 1A and 2B, and after the melt spinning through a common hollow spinning die (see Fig. 2), ordinary cooling is performed. In the cooling and solidification of the device, the capillary cooling device 1 is provided between the spinneret and the normal cooling device, and the injection hole 2 of the capillary cooling device 1 is located near the discharge thread Y. It is characterized by spraying the cooling air from.

The present invention has a side receiving and receiving the cooling wind from the capillary cooling device (1) in the longitudinal direction of the discharge thread, and as a result, the difference in orientation and crystal size between the side receiving and cooling the primary cooling As a result, different heat shrinkage characteristics are finally expressed.

In the present invention, by adjusting the distance between the discharge yarn (Y) and the capillary cooling device (1), the cooling wind temperature and the speed, the degree of difference in the heat shrinkage characteristics expressed on both sides of the discharge yarn can be controlled. You can adjust the degree.

Examples 1-2

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 wound at a constant speed using a spinneret shown in FIG. The diameter of the capillary tube (1) is 1.2 mm, the diameter of the injection hole (2) is 0.3 mm, the speed of the cooling wind is 60 cm / sec, and the distance between the capillary tube and the discharge thread Y is 1 cm (Example 1) and 2 cm (Example 2) to prepare an unstretched filament, which was subjected to the stretching step under the conditions of the draw ratio 3.0 times, the stretching temperature 110/190 ℃, the relaxation heat treatment after stretching was treated for 5 minutes at 80 ° C wet water (water). The properties of the yarn thus obtained and the radio-stretching workability are shown in Table 1.

Comparative Example

The first component was polyethylene terephthalate having an intrinsic viscosity of 0.85, and the second component was polyethylene terephthalate having an intrinsic viscosity of 0.52, and the intrinsic viscosity difference of the positive component was 0.3 and the melt viscosity difference at the spinning temperature was 1,730 pore. The spinneret was the same as that shown in Figure 4, and other conditions were prepared in the same manner as in the above embodiment.

The results are shown in Table 1.

Compressive elasticity: According to KS K 2617 (Cotton Duvet Cotton Testing Method), the sample was measured as having a size of 20 × 20 cm and the compressibility and recovery rate were obtained.

Volume recovery rate by drying: The sample was measured in a size of 20 × 20 cm according to KS K 2617 (cotton duvet cotton test method).

Hollow ratio = (cross-sectional area of hollow part) / (cross-sectional area of fiber) × 100 (%)

Crimp number C1, C2: Take a sample of short fiber and make 10 5cm-type specimens at the super-load of 0.05g / d without possible tension, and magnify with a microscope to measure the super-load crimp number (inch / inch) C1 After removing the super load, leaving it for 30 seconds under no tension, the external crimp number C2 is measured.

The present invention eliminates the use of a spinneret having a complicated structure by using a single component, and solves the problems of curvature, deterioration in spinning workability and compatibility caused by the use of two components. In addition, when the two components are used, the hollow portion is prevented from being eccentric and contracted on the material having a higher melt viscosity (see FIG. 3) in the process of forming the hollow portion due to the difference in melt viscosity of the positive component. Excellent compression recovery.

1 is a schematic view of the manufacturing process of the present invention.

1 (b) is a perspective view of a cooling apparatus used in the present invention.

2 is a cross-sectional view of the spinneret used in the present invention.

3 is a cross-sectional view of a yarn made by a general binary composite spinning method.

4 is a cross-sectional view of the spinneret used in the comparative example.

Claims (1)

In melt spinning, cooling, and solidifying a single-component polyester polymer with a conventional hollow spinning die, a capillary cooling device is placed on one side of a discharge yarn directly below the spinneret before cooling and solidifying by a conventional method. A method for producing a single component hollow spontaneous crimped fiber using a capillary cooling device, characterized in that spraying from the injection hole (2) of 1).

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