KR102356900B1 - Multilobal polyester conjugate fiber, High edged multilobal silk-like polyester fiber, Method manufacturing thereof and Yarns comprising the same - Google Patents

Abstract

The outermost part of the solubility through the present invention; and a multi-leaf-type core part; and a multi-leaf-type polyester composite fiber comprising a, and a multi-leaf-type silk-like polyester fiber having a high edge by eluting the outermost part, and including the same By manufacturing the fabric, it is possible to manufacture a fabric having a touch and luster similar to silk.

Description

Multilobal polyester composite fiber, multilobal similar silk polyester fiber having high edge, manufacturing method thereof, and fabric including same }

The present invention can prepare a multi-leaf type polyester composite fiber having an elution part, and elute the elution part of the composite fiber to produce a multi-leaf type silk polyester fiber having a high edge, wherein the fiber has a center of the protrusion part It is possible to manufacture a fabric with a shimmery touch and deep gloss by concave in the center direction of the

Silk is a natural fiber extracted from a cocoon. Silk fabric is harmless to the human body but has excellent hygroscopicity to absorb sweat and moisture, and has excellent breathability and heat retention. As one of the materials, it is used in various clothes and clothing.

The reason why silk fibers have superior gloss and touch than other fabrics is because they have a sharp and flat cross-sectional structure. Due to the flat cross section, light is reflected in one direction and shows a deep gloss, and the unique texture of silk is expressed due to the sharp cross section structure. In a fabric, which is an aggregate of these fibers, the above effect is more prominently expressed compared to other fabrics.

However, since silk is a natural fiber, there is a limit to mass production, and due to its high price, research on synthetic fibers having the same luster and feel as silk has been continued. For example, Korean Patent Laid-Open No. 2008-0036758 discloses a method of manufacturing silk paper by chemically converting silk into short fibers, so that silk is used as paper beyond clothing.

As a part of the above research, as a prior art for producing a pseudo-silk yarn, a method of differentiating the cross-sectional shape and fineness of each monofilament constituting the yarn is used. In this way, natural silk luster can be obtained, but in the case of general synthetic fiber spinning method, it is difficult to obtain a silky feel as it has no choice but to implement a curved cross section when passing through a sieve. There is a disadvantage in that the products having different cross sections are interlocked with each other and the drape feeling is lost because they are close like a single monofilament.

After all, the silk-like silk yarn prepared by the conventional method is difficult to achieve a flat cross-section even if it is made of a fiber having a triangular cross-section, and since light is diffusely reflected in an irregular direction, it is difficult to obtain a luster like natural silk, and the triangular cross-section is difficult to achieve. Branches have a problem in that it is difficult to obtain yarn through spinning. In addition, when false-twisting to have the same luster as natural silk, there is a problem in that the feel of natural silk is lost. Furthermore, when using the double-shrink blended yarn, the manufacturing cost increases, and the double-shrunk blended yarn must also go through a twisting process in order to have a silky luster, so there is a problem in that it is insufficient to have a tactile feel like natural silk. Accordingly, there is an urgent need to develop a similar silk yarn to solve the above problems.

Republic of Korea Patent Publication No. 2008-0036758 (published on: 2008.04.29)

The present invention was devised to solve the above problems, to prepare a composite fiber including an outermost part and a deep part, and to elute the outermost part of the composite fiber to prepare a similar silk polyester fiber having a high edge, We want to apply this to the fabric.

The multi-leaf polyester composite fiber of the present invention includes a multi-leaf core having 2 to 8 protrusions; And it may be a composite fiber comprising a; and the outermost portion coupled to the end of the protrusion of the core.

As a preferred embodiment of the present invention, the outermost portion may include a soluble polyester resin.

As a preferred embodiment of the present invention, the outermost portion of the end of the protrusion may be characterized in that each is not connected to each other.

In a preferred embodiment of the present invention, the intrinsic viscosity of the composite fiber may be 0.60 to 0.75 dl/g.

As a preferred embodiment of the present invention, the composite fiber may have a strength of 4.0 to 5.0 g/de, an elongation of 25.0 to 38.0%, and a specific shrinkage rate of 9 to 13%.

For another object of the present invention, the multi-leaf-like silk polyester fiber having a high edge may be a fiber after dissolution by dissolving the composite fiber in an aqueous alkali solution of 2 wt% at 80 to 110° C. for 20 to 40 minutes. .

As a preferred embodiment of the present invention, the protrusion of the fiber after elution may be concave toward the center of the core.

As a preferred embodiment of the present invention, the fibers after elution may satisfy the following relational expression (1).

[Relational Expression 1]

In the above relation 1, P denotes the circumferential length (㎛ ² ) of the cross-section of the multi-leaf-like silk polyester fiber, and A denotes the cross-sectional area (㎛ ² ) of the multi-leaf-like silk polyester fiber.

As a preferred embodiment of the present invention, the weight of the fiber after elution may satisfy the following relational expression (2).

[Relational Expression 2]

In Relation 2, n denotes the number of protrusions, and n=2 to 8.

As a preferred embodiment of the present invention, the intrinsic viscosity of the fiber after elution may be 0.55 to 0.70 dl/g.

For another object of the present invention, it is possible to manufacture a woven or knitted fabric including the multi-leaf polyester composite fiber.

For another object of the present invention, it is possible to manufacture a woven or knitted fabric including the multi-leaf type similar silk polyester fiber having the high edge.

According to another object of the present invention, the method for producing a multi-leaf-like silk polyester fiber having a high edge comprises the steps of: manufacturing a yarn by compound spinning a resin for forming a core and a resin for forming an outermost portion through a spinneret; performing primary and secondary stretching of the spinning to obtain a multi-leaf polyester composite fiber; and eluting the multi-leaf type polyester composite fiber with an aqueous alkali solution of 2 wt% for 20 to 40 minutes to obtain a multi-leaf type similar silk polyester fiber.

As a preferred embodiment of the present invention, the spinneret may be of a multilobed type.

The present invention prepares a multi-leaf type polyester composite fiber including an elution part, and by dissolving it, a multi-leaf type polyester fiber having a high edge can be manufactured, and a fabric including the same can be manufactured to provide silk-like luster and tactile feel. Eggplant can make a silk-like fabric.

1 is a cross-section of a multi-leaf type polyester composite fiber, and is an image observed with an optical microscope.
2 is a cross-section of a multi-leaf-type pseudo-silk polyester fiber, and is an image observed with an optical microscope.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar elements throughout the specification.

Hereinafter, the present invention will be described in more detail through a method for producing a multi-leaf-like silk polyester fiber having a high edge.

The manufacturing method comprises: a first step of manufacturing a spinning material by complex spinning a resin for forming a deep part and a resin for forming an outermost part through a spinneret; a second step of performing primary and secondary stretching of the spinning material to obtain a multi-leaf polyester composite fiber; and a third step of eluting the multi-leaf type polyester composite fiber with an aqueous alkali solution having a concentration of 2 wt% to obtain a multi-leaf type similar silk polyester fiber.

First, as the resin for forming the core, any polyester resin having very low or no solubility in an alkaline solution may be used without limitation, preferably polyethylene terephthalate (PET) resin, polytrimethylene terephthalate (PTT) resin and It may include at least one selected from among polybutylene terephthalate (PBT) resins, and more preferably polyethylene terephthalate (PET) resins.

In addition, as the resin for forming the outermost part, any polyester resin known to be soluble in an alkali solution may be used without limitation, for example, an aliphatic polyhydric carboxylic acid having 4 to 12 carbon atoms, preferably 6 to 12 carbon atoms, more preferably preferably 6-10 aliphatic polyhydric carboxylic acids and acid components such as sulfonic acid metal salts; and a known diol component such as polyethylene glycol; a modified polyester resin may be included.

In addition, the intrinsic viscosity difference between the resin for forming the core and the resin for forming the outermost portion may be 0.20 to 0.50 dl/g, preferably 0.25 to 0.45 dl/g.

Specifically, the intrinsic viscosity of the resin for forming the core is 0.60 to 0.80 dl/g, preferably 0.65 to 0.75 dl/g, and more preferably 0.60 to 0.70 dl/g .

In addition, the intrinsic viscosity of the resin for forming the outermost part may be 0.70 to 1.0 dl/g, preferably 0.80 to 1.0 dl/g. If the intrinsic viscosity is less than 0.70 dl/g, there may be a problem in spinning workability due to the frequent occurrence of yarn breakage due to a decrease in the mechanical strength of the fiber in the spinning process, and uniform dissolution is difficult due to excessive dissolution. Or, it may cause alkali intrusion of the deep part, which is a non-dissolving component. In addition, if it exceeds 1.0 dl/g, spinning workability may be good due to high mechanical strength, but there may be a problem in that the alkali dissolution rate is significantly lowered and the time required for the weight reduction process is increased.

The spinneret of step 1 may be multi-lobed, and the multi-leaf type may have 2 to 8 protrusions, preferably 3 to 8, and more preferably 3 to 5 protrusions.

In addition, the composite spinning of the first step may be made through a composite spinning facility, and may be melt spinning under 260 ~ 300 ℃, preferably 270 ~ 290 ℃, and the resin for forming the deep part and the resin for forming the outermost part The sand ratio may vary depending on the number of protrusions, and when the number of protrusions is 2 to 8, the spinning ratio may be 1: 0.25 to 1: 5.0, preferably 1: 0.30 to 1: 4.0. In addition, when the number of protrusions is 2 to 4, the radiation ratio may be 1: 0.30 to 1: 0.60, preferably 1: 0.35 to 1: 0.55. If there are 2 to 4 protrusions, if the resin for forming the outermost part is radiated at less than 0.30 times compared to the resin for forming the deep part, the outermost part becomes too small and there may be a problem that the desired shimmery touch cannot be obtained, If it exceeds 0.60, the outermost portion becomes enlarged, there may be a problem that the shape of the fiber forming portion cannot be expressed in a target shape, and there may also be a problem that the outermost portion is connected to each other.

The stretching in the second stage may consist of primary stretching and secondary stretching. The primary stretching may be performed at a yarn speed of 1100 ~ 1500mpm (m/min) through the first godet roller, preferably at a yarn speed of 1200 ~ 1400mpm, and the secondary stretching is 4000 ~ 4500mpm through the second godet roller It may be carried out at a yarn speed of, preferably, at a yarn speed of 4100 to 4400 mpm.

In addition, the difference between the primary stretching temperature and the secondary stretching temperature may satisfy the following relational expression (3).

[Relational Expression 3]

In Relation 3, the stretching temperature difference means the absolute value of the amount of change between the primary stretching temperature and the secondary stretching temperature. If the drawing temperature difference is less than 20 ° C, the generation of defective yarns due to inter-fiber interference may increase due to poor flow, and due to poor heat setting, rapid shrinkage may occur after winding and the cake shape may collapse, and at 40 ° C. If it exceeds, sufficient heat for drawing is not supplied to the fiber, so there is a high risk of yarn breakage during drawing.

Specifically, the first stretching may be made under 70 ~ 110 ℃, preferably made under 75 ~ 105 ℃.

In addition, the secondary stretching may be made under 90 ~ 120 ℃, preferably made under 95 ~ 120 ℃. If the secondary stretching temperature is less than 90 ℃, the composite fiber is not sufficiently heat-set, and the cake shape may collapse due to rapid shrinkage after winding up. Otherwise, there may be a problem in that a soft touch and deep gloss cannot be obtained due to the occurrence of defective yarn.

In addition, the draw ratio of the primary stretching and the secondary stretching may vary depending on the number of protrusions, and specifically, the higher the content of the outermost part - that is, the greater the number of protrusions - the lower the draw ratio. Preferably, when there are 2 to 8 protrusions, the draw ratio may be from 2.0 to 4.0, and more preferably from 2.5 to 4.0. In addition, when there are 2 to 4 protrusions, the draw ratio may be 3.5 to 4.0, and more preferably 3.6 to 4.0. If the draw ratio is out of the above range, there may be a problem in that the appearance of the manufactured composite fiber is poor or the texture of the composite fiber is deteriorated due to cracking.

In addition, in the manufacturing method of the composite fiber, other additional processes may be further performed, and detailed description thereof will be omitted herein.

The elution in step 3 may be carried out at 80 to 110° C., preferably at 90 to 105° C., for 20 to 40 minutes, preferably for 25 to 35 minutes. If the elution time is less than 20 minutes, the weight loss rate is significantly reduced, so there may be a problem that fibers with a desired sharp edge cannot be obtained. There may be issues with breaches. In this case, the alkali component may include sodium hydroxide (NaOH).

When the multi-leaf polyester composite fiber that can be produced through the manufacturing method is described with reference to FIG. 1 , the composite fiber (100 in FIG. 1 ) includes a multi-lobed core having a protrusion; and the outermost fiber (120 in FIG. 1) coupled to the end of the protrusion (110 in FIG. 1) of the core. In addition, the number of the protrusions may be 2 to 8, preferably 3 to 8, and more preferably 3 to 5. If there are less than two protrusions, a composite fiber of an asymmetric shape may be manufactured, and as a result, a problem may occur that a multi-leaf type composite fiber cannot be manufactured. In addition, when the number of protrusions exceeds 8, uniform polymer distribution is difficult, and when a large amount of resin for forming the outermost portion is injected to solve this problem, the resin for forming the outermost portion is penetrated into the core to ensure a stable cross-section is difficult to implement. In addition, when the number of protrusions exceeds 8, the gap between the protrusions is too narrow to sufficiently express the multi-leaf structure, which is one of the characteristics of the present invention, so that the unique feel and gloss of the heterogeneous cross section is inhibited, or each of the outermost parts is There may be a connection problem.

The physical properties of the composite fiber are as follows. First, the intrinsic viscosity of the composite fiber may be 0.60 to 0.75 dl/g, preferably 0.65 to 0.75 dl/g. If it is less than 0.60 dl/g, it may cause rapid thermal decomposition and hydrolysis during the spinning process, and the orientation of the core component may not be sufficiently expressed, so that the strength and elongation of the fiber may be lowered. In addition, when it exceeds 0.75 dl / g, the dissolution (loss rate) is poor, and the outermost fiber may remain even after dissolution, and as a result, a problem may occur that the required physical properties cannot be reached, and the spinning process and It may cause frequent yarn breakage during yarn processing, and there may be problems in dyeing irregularities and dyeing abnormalities such as dye spots when manufacturing fabrics including composite fibers.

In addition, the strength of the composite fiber may be 4.0 to 5.0 g/de (denier), preferably 4.0 to 4.9 g/de. If the strength is less than 4.0 g/de, the core may be violated by alkali, and the strength of the fiber is low after elution of the composite fiber so that the cross section is broken or the shape stability cannot be maintained and the sharp edge of the protrusion disappears. There may be a problem. If the strength exceeds 5.0 g/de, there may be a problem that it is difficult to use for general clothing.

In addition, the elongation of the multi-leaf polyester composite fiber may be 25.0 to 38.0%, preferably 28.0 to 35.0%. If the elongation is less than 25.0%, there is a risk that cutting occurs even by a weak external force during weaving or knitting, resulting in poor process passability. There may be, and during weaving or knitting, uneven stretching may occur even by a weak external force, resulting in problems such as poor dyeing and unevenness of fabric density.

On the other hand, the multi-leaf type pseudo silk polyester fiber having a high edge that can be produced through the above manufacturing method is a fiber after elution prepared by eluting the outermost part of the multi-leaf type polyester composite fiber, and satisfies the following relational expression 1 can

[Relational Expression 1]

In the above relation 1, P denotes the circumferential length (㎛ ² ) of the cross-section of the multi-leaf-like silk polyester fiber, and A denotes the cross-sectional area (㎛ ² ) of the multi-leaf-like silk polyester fiber.

If the value of Relation 1 is less than 1.5, the protrusion of the fiber does not sufficiently protrude after elution and simply stays in a curved shape, and deep gloss cannot be expressed by shrill touch and unidirectional reflection, which is the purpose of the present invention. There may be a problem that similar silk cannot be produced.

In addition, the weight of the fiber after elution may satisfy the following relational expression (2).

[Relational Expression 2]

In Relation 2, n means the number of protrusions, and may be n=2 to 8, preferably n=3 to 8 . if When the value of Relation 2 is less than 20%, there may be a problem that it is difficult to implement a sharp cross-section because the dissolved component of the edge part is too low. There may be a problem in that the gap is too small to implement a sharp cross-section.

또는

형이고, θ¹ 및 θ²는 각각 θ = 45 ~ 90 °일 수 있고, 바람직하게는 θ = 50 ~ 90 ° 일 수 있으며, 더욱 바람직하게는 θ = 55 ~ 90 ° 있다. 단, θ¹ 또는 θ²는 90°미만일 수 있다.On the other hand, the high edge means that the protrusion of the fiber after the elution has a sharp edge. Specifically, when the fiber after dissolution is described with reference to FIG. 2 , the fiber after dissolution ( 130 in FIG. 2 ) may be multi-lobed, and the protrusion of the fiber after dissolution may be concave in the central direction of the core. In other words, as the center of the protrusion enters in the direction of the center of the core, the edge ( 140 in FIG. 2 ) at the end of the protrusion may be sharp. It not only gives a tactile feel, but also exhibits a long-lasting effect, and a deep luster is expressed by unidirectional reflection of light, so silk-like silk can be manufactured. Preferably, the angle of the corner may be less than or equal to 90°, more preferably, the protrusion

or

, and θ ¹ and θ ² may each be θ = 45 to 90 °, preferably θ = 50 to 90 °, and more preferably θ = 55 to 90 °. However, θ ¹ or θ ² may be less than 90°.

If the corner angle exceeds 90°, a sharp cross-sectional shape cannot be implemented, so it is not possible to manufacture a fabric that exhibits silky texture and longevity, as well as a deep luster by unidirectional reflection of light. There may be problems that are difficult to manifest.

In addition, the intrinsic viscosity of the fiber after dissolution may be 0.55 to 0.70 d/g, preferably 0.60 to 0.70 dl/g.

The above-mentioned multi-leaf polyester composite fiber (fiber before elution) and multi-leaf type similar silk polyester fiber (fiber after elution) are partially drawn yarns formed by spinning through a single spinneret, or various types other than drawn yarns or false twisted yarns. It may be manufactured through yarn processing, and may be manufactured from several types of yarn.

On the other hand, the present invention provides a fabric woven or knitted including the multi-leaf type polyester composite fiber and the multi-leaf type similar silk polyester fiber. The fabric is meant to include both fabrics or knitted fabrics, and specifically, it may be a fabric or knitted fabric woven using the multi-leaf type similar silk polyester fiber as any one or more of warp and weft yarns. . In this case, the weaving may be any one method selected from the group consisting of plain weave, twill weave, suja weave and double weave. However, it is not limited to the base material of the fabric structure, and the density of warp and weft yarns in weaving is not particularly limited. In addition, the knitting may be performed by a weft knitting or warp knitting method, and the specific method of the weft knitting and warp knitting may be performed by a conventional weft knitting or warp knitting method.

On the other hand, the present invention provides a fabric woven or knitted including the multi-leaf polyester composite fiber. The dissolution of the composite fiber is preferably performed before dyeing after washing, scouring and bleaching of the fabric, but is not limited thereto.

In the above, the present invention has been mainly described with respect to the embodiment, but this is only an example and does not limit the embodiment of the present invention. It can be seen that various modifications and applications not exemplified above are possible within a range that does not deviate from the above. For example, each component specifically shown in the embodiment of the present invention can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

[Example]

Example 1: Preparation of Multileaf Polyester Composite Fiber

(1) Through a multi-leaf spinneret with three protrusions, a resin for forming the core containing polyethylene terephthalate resin (Bright, manufactured by Toray Advanced Materials) as the core, and alkali-soluble polyester resin (ESP from Toray Advanced Materials) A resin for forming the outermost part including At this time, the viscosity difference between the resin for forming the core and the resin for forming the outermost portion is 0.30 dl/g.

(2) The spun material was drawn, but the draw ratio through the first godet roller of the first drawing and the second godet roller of the second drawing was 3.8, and the drawing temperature difference between the first drawing and the second drawing was 30 ℃ and the secondary stretching temperature was 115 ℃ to prepare a multi-leaf polyester composite fiber.

At this time, the composite fiber has a fineness of 105 denier, and the number of filaments is 24.

Examples 2 to 8 and Comparative Examples 1 to Comparative Example 7: Preparation of multi-leaf polyester composite fibers

A multi-leaf polyester composite fiber was prepared in the same manner as in Example 1, but Examples 2 to 8 and Comparative Examples 1 to 7 were carried out under the conditions shown in Tables 1 to 3 below.

Experimental Example 1: Evaluation of multi-leaf polyester composite fibers (fibers before dissolution)

The composite fibers of Examples 1 to 8 and Comparative Examples 1 to 7 were evaluated in the following manner and shown in Tables 1 to 3 below.

(1) Measurement of strength and elongation

Strength and elongation were measured using an automatic tensile tester (Textechno) at a speed of 200 cm/min and a gripping distance of 50 cm. When the fiber is stretched until it is cut by applying a constant force, the value obtained by dividing the applied load by the denier (de) is the strength (g/de), and the value expressed as a percentage of the initial length to the stretched length (%) is the elongation. defined.

(2) Measurement of evenness

The uniformity was measured as the average value of the measured values of the uniformity per 100m using the Uster TESTER 6-C800 instrument of Uster Technologies.

(3) Measurement of non-shrinkage (BWS Boiling water shringkage)

The specific shrinkage rate was measured by the following method as a value expressing the degree of shrinkage of the fiber in 100 parts at 100 °C of water, and satisfies the following relational expression (4).

[Relational Expression 4]

1) 10m of fiber was wound on a skein.

2) A load was applied to the fiber in the skein state, and the length before contraction was measured. At this time, the load (g) was calculated as the fineness (denier) × 2.

3) The fibers in the skein state were wrapped in a cloth and heat-treated in a water bath at 100° C. for 30 minutes.

4) After the fibers having performed the above steps were completely dried, a load was applied to measure the length after shrinkage.

(5) Evaluation of cross-sectional formability

Cross-sectional formability was measured at 200 times magnification using an optical microscope, and 20 winding bodies (cakes) wound with composite fibers were randomly selected, and 0 abnormalities occurred in 24 arbitrarily selected fiber strands of the winding body. Cases were marked with '◎', cases with less than 2 occurrences were marked with '○', and cases with more than 3 occurrences were marked with '×'.

(6) Fiber appearance evaluation

In order to evaluate whether defects such as wool occur in the appearance of fibers, 20 or more winding bodies (cakes) in which 8 kg of composite fibers are wound for each experiment were arbitrarily selected, and the appearance of fibers was visually evaluated. For each experiment, if there was less than 1 average yarn defect per winding body (there are yarn surface bristle, loop, etc.), it was marked as 'satisfactory' If it occurred less than, it was marked as 'normal', and if it occurred more than 5, it was evaluated and marked as 'poor'.

Experimental Example 2: Evaluation of multi-leaf-like silk polyester fibers (fibers after dissolution)

The composite fibers of Examples 1 to 8 and Comparative Examples 1 to 7 were eluted in an aqueous solution containing 2% by weight of sodium hydroxide (NaOH, alkali component) under normal pressure of 100° C. for 30 minutes to elute the fibers (multi-leaf type) of silk polyester fiber) was obtained, and the amount of change in the weight of the fiber after elution was measured through Relation 2 below, and the results are shown in Tables 1 to 3 below.

[Relational Expression 2]

In Relation 2, n denotes the number of protrusions, and n=2 to 8.

In addition, multi-leaf-type pseudo-silk polyester fibers eluted from the composite fibers of Examples 1 to 8 and Comparative Examples 1 to 7 were used as warp and weft yarns to prepare fabrics of 8.5 × 7 cm in width and length, respectively. , was evaluated to have silk-like gloss and feel by the following method, and the results are shown in Tables 1 to 3 below.

(1) Gloss evaluation

An expert evaluation was performed to check whether it had the same luster as silk, and as a result of the evaluation, if the luster was similar to silk, it was marked with '◎'. indicated.

(2) Tactile evaluation

An expert evaluation was performed to confirm whether the texture similar to silk appeared, and if the evaluation result was similar to silk, it was marked with '◎'. indicated.

Example 1 Example 2 Example 3 Example 4 Example 5 dissolution Number of spinneret protrusions 3 2 8 3 3 Deep part: Radiation ratio of the outermost part 1:0.43 1:0.25 1:4.0 1:0.43 1:0.43 draw ratio 3.8 3.9 3.0 3.6 4.0 Stretching temperature difference (℃) 30 30 30 30 30 Secondary stretching temperature (℃) 115 115 115 115 115 Fineness (denier) / number of filaments 105/24 105/24 105/24 105/24 105/24 Intensity (g/de) 4.89 4.91 4.12 4.77 4.98 Elongation (%) 33.24 29.35 35.46 34.31 31.84 Uniformity (U%) 0.85 0.94 1.01 0.86 0.93 non-shrinkage rate 11.59 10.13 12.66 11.95 12.43 cross-section ◎ ○ ○ ◎ ◎ Appearance evaluation satisfied Good Good satisfied Good after dissolution number of protrusions 3 2 8 3 3 Weight change (%) 29 20 78 30 27 Polish ◎ ○ ○ ◎ ◎ touch ◎ ○ ○ ◎ ◎

Example 6 Example 7 Example 8 Comparative Example 1 Comparative Example 2 dissolution Number of spinneret protrusions 3 3 3 9 3 Deep part: Radiation ratio of the outermost part 1:0.43 1:0.43 1:0.43 1:9.0 1:0.43 draw ratio 3.8 3.8 3.8 3.0 3.5 Stretching temperature difference (℃) 20 40 23 30 40 Secondary stretching temperature (℃) 115 110 115 115 125 Fineness (denier) / number of filaments 105/24 105/24 105/24 105/24 105/24 Intensity (g/de) 4.50 4.43 4.31 3.58 3.89 Elongation (%) 33.32 37.54 32.51 42.35 38.42 Uniformity (U%) 1.21 1.92 1.32 2.02 1.65 non-shrinkage rate 9.85 12.67 10.21 14.26 7.81 cross-section ◎ ◎ ◎ × ◎ Appearance evaluation Good Good Good error usually after dissolution number of protrusions 3 3 3 9 3 Weight change (%) 30 29 30 91 28 Polish ◎ ◎ ◎ × ○ touch ○ ◎ ◎ × ○

Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 dissolution Number of spinneret protrusions 3 3 3 3 3 Deep part: Radiation ratio of the outermost part 1:0.43 1:0.43 1:0.43 1:0.67 1:0.25 draw ratio 4.2 3.8 3.8 3.8 3.8 Stretching temperature difference (℃) 40 15 45 40 40 Secondary stretching temperature (℃) 125 115 130 115 115 Fineness (denier) / number of filaments 105/24 105/24 105/24 105/24 105/24 Intensity (g/de) 4.23 3.87 3.96 4.19 5.10 Elongation (%) 30.92 40.30 35.76 29.41 36.74 Uniformity (U%) 1.58 1.51 1.45 1.48 1.04 non-shrinkage rate 13.28 13.85 9.01 13.21 10.01 cross-section ◎ △ ◎ △ ○ Appearance evaluation usually error error satisfied usually after dissolution number of protrusions 3 3 3 3 3 Weight change (%) 27 30 30 39 20 Polish ○ ◎ ◎ ○ △ touch △ △ △ △ △

Looking at Tables 1 to 3, Examples 1 to 8 showed that the strength, elongation, and specific shrinkage were all within the claims of the present invention, and cross-sectional formability and appearance were also satisfactory for use as products. appear.

In addition, the fibers (multi-leaf-like silk polyester fibers) eluted from the composite fibers of Examples 1 to 8 were fibers from which the outermost part was eluted, and had a luster and feel similar to silk, and the amount of change in weight was also Appeared within the range, it was found that the outermost part was eluted at an appropriate level.

On the other hand, Comparative Example 1 was spun with a spinneret in which the number of protrusions exceeded 8, and compared with Example 3 (the number of protrusions of the spinneret was 8), the strength was less than 4.0 g/de, and the appearance and It was found that the cross-sectional formability was very poor. It is predicted that the amount of resin for forming the outermost portion was excessive, resulting in defective yarn, and eventually the strength was rather decreased. In addition, it was found that the amount of change in the weight of the fibers after dissolution exceeded 10n% (n = the number of protrusions), and it was found that the fibers were overeluted, and after dissolution, it was found that silk-like luster and touch were not expressed.

On the other hand, Comparative Example 2 was stretched at a secondary stretching temperature (heat setting temperature) exceeding 120 ° C., compared with Example 1 (second stretching temperature is 115 ° C.), strength of less than 4.0 g / de, In addition to having an elongation exceeding 38.0% and a specific shrinkage rate of less than 9.0%, the appearance was also undesirable. This is considered to be because defective yarn occurred as all parts in contact with the roller due to the high secondary stretching temperature (heat setting temperature) were the outermost part of about 0.4de (denier) with low thermal stability.

On the other hand, Comparative Example 3 was stretched at a draw ratio exceeding 4.0 and a secondary stretching temperature (heat setting temperature) exceeding 120 ° C. Compared with Example 1 (draw ratio 3.8 and secondary stretching temperature 115 ° C.), The appearance was not good, and it is judged that this is due to the excessively high draw ratio and tearing due to the secondary drawing temperature. In addition, in Comparative Example 3, despite the increase in the draw ratio compared to Example 5 (draw ratio 4.0), the strength was rather decreased, which is due to the sharp increase in the bad yarn of the fiber appearance, it can be predicted that it is due to the splitting due to overstretching. It can be seen that, as the specific shrinkage rate also increased, large shrinkage occurred after dissolution, as well as a decrease in gloss due to cracking and poor tactile feel.

On the other hand, Comparative Example 4 was stretched with a stretching temperature difference of less than 20 ° C., compared with Example 6 (stretching temperature difference 20 ° C.), the strength was less than 4.0 g/de, and the appearance and cross-sectional formability were poor. However, this is predicted to be due to the poor flow of the private cavity due to insufficient stretching temperature difference. In addition, the feel of the fiber after dissolution was also not good, which is expected because a large amount of defective yarn was generated during the manufacturing process of the composite fiber.

On the other hand, Comparative Example 5 was stretched at a secondary stretching temperature exceeding 120 °C and a stretching temperature difference exceeding 40 °C, and compared with Example 7 (second stretching temperature 110 °C and stretching temperature difference 40 °C), the appearance Due to this defect, there was a problem in that the feel of the fiber after elution was also not good, and there was a problem that the strength was less than 4.0 g/de. was found to have occurred.

On the other hand, Comparative Example 6 is a case in which the radiation ratio of the resin for forming the deep part and the resin for forming the outermost part exceeds 1: 0.60 when there are three protrusions, compared with Example 1 (radiation ratio 1: 0.43) Although the outermost part is normally formed on the ridge, when 24 single fibers were sampled and observed, 4 or more strands with uneven cross-sectional shape were found on average. It can be predicted that as the discharge amount of the resin for forming the outermost part increases, the cross-sectional formability deteriorates as the resin for forming the outermost part penetrates into the deep part, which could be predicted even with a specific shrinkage rate exceeding 13.0%. In addition, it was observed that the fiber had poor gloss and tactile feel after dissolution. This is because the outermost part was excessively large and the area of the protruding part of the deep part was small, and after dissolution, a sharp deformed cross section was not expressed and it appeared in a round shape. there was.

On the other hand, Comparative Example 7 is a case where the radiation ratio of the resin for forming the deep part and the resin for forming the outermost part is less than 1: 0.30 when there are three protrusions, and when compared with Example 1 (radiation ratio 1: 0.43), the appearance is not preferable Specifically, when 24 single fibers were sampled and observed, 4 or more cross-sectional defects were confirmed in which the resin for forming the outermost part was not spun from one or more protrusions. It was found that, as the discharge amount of the outermost portion was very low, the outermost portion was not sufficiently formed at the end of the protrusion, resulting in poor shape stability as well as poor cross-sectional formability and appearance. In addition, although the strength was found to be greater than 5.0 g/de, there was a problem that the fibers did not have a luster and feel similar to silk after elution. This is considered to be because the discharging amount was low compared to the number of protrusions, and the protruding edges of the fibers were not sharp enough after elution.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

100: multi-leaf polyester composite fiber 110: multi-lobed core protrusion
120: outermost part 130: multi-leaf type silk polyester fiber
140: edge of the protrusion

Claims (10)

multilobed core with 2 to 8 protrusions; and
It is a composite fiber comprising; the outermost portion coupled to the end of the protrusion of the core portion,
The outermost portions coupled to the ends of the protrusions are not connected to each other, respectively,
The outermost part contains a soluble polyester resin having an intrinsic viscosity of 0.80 to 1.0 dl/g,
The core includes a resin for forming the core,
The difference in intrinsic viscosity between the soluble polyester resin and the resin for forming a core is 0.20 to 0.45 dl/g,
The resin for forming the core includes at least one selected from polyethylene terephthalate resin, polytrimethylene terephthalate resin, and polybutylene terephthalate resin,
The composite fiber is a multi-leaf type polyester composite fiber, characterized in that the strength of 4.0 ~ 5.0 g / de.
The multi-leaf polyester composite fiber according to claim 1, wherein the intrinsic viscosity of the composite fiber is 0.60 to 0.75 dl/g.
The multi-leaf type polyester composite fiber according to claim 1, wherein the composite fiber has an elongation of 25.0 to 38.0% and a specific shrinkage of 9 to 13%.
It is a fiber after dissolution of the multi-leaf polyester composite fiber according to claim 1 in an aqueous alkali solution of 2 wt% concentration at 80 to 110° C. for 20 to 40 minutes,
After the elution, the protrusion of the fiber moves toward the center of the core.

or

It has a concave high edge shape, and ^{each of the angles θ 1} and θ ² satisfies 50 to 90 °, but θ ¹ or θ ² is less than 90 °,
The fibers after elution are multi-leaf-type silk polyester fibers having a high edge, characterized in that it satisfies the following Relational Equation 1;
[Relational Expression 1]

In the above relation 1, P denotes the circumferential length (㎛ ² ) of the cross-section of the multi-leaf-like silk polyester fiber, and A denotes the cross-sectional area (㎛ ² ) of the multi-leaf-like silk polyester fiber.
[Claim 5] The method of claim 4, wherein the weight of the fiber after elution satisfies the following Relational Equation (2): Multileaf-type silk polyester fiber having a high edge;
[Relational Expression 2]

In Relation 2, n means the number of protrusions, and n=2 to 8.
[Claim 5] The multi-leaf-like silk polyester fiber having a high edge according to claim 4, wherein the fiber has an intrinsic viscosity of 0.55 to 0.70 dl/g after elution.
A fabric woven or knitted including the composite fiber according to claim 1 .
A fabric woven or knitted including fibers after elution according to any one of claims 4 to 6.
manufacturing a spinneret by complex spinning a resin for forming a deep part having an intrinsic viscosity of 0.60 to 0.80 dl/g and a resin for forming an outermost part having an intrinsic viscosity of 0.80 to 1.0 dl/g through a spinneret;
performing primary and secondary stretching of the spinning material to obtain a multi-leaf polyester composite fiber stretched at a draw ratio of 2.0 to 4.0 times; and
eluting the multi-leaf type polyester composite fiber with an aqueous alkali solution having a concentration of 2% by weight at 80 to 110° C. for 20 to 40 minutes to obtain a multi-leaf type similar silk polyester fiber;
The resin for forming the core includes at least one selected from polyethylene terephthalate resin, polytrimethylene terephthalate resin, and polybutylene terephthalate resin,
The stretching is performed by primary stretching and secondary stretching, the primary stretching is performed under the conditions of a stretching temperature of 70 to 110° C. and a yarn speed of 1100 to 1500 mpm, and the second stretching is a stretching temperature of 90 to 120° C. and a yarn speed of 4000 It is performed under the condition of ~ 4500 mpm,
After the elution, the protrusion of the multi-leaf-like silk polyester fiber moves toward the center of the core.

or

It has a concave high edge shape, and ^{each of the angles θ 1} and θ ² satisfies 50 to 90°, but θ ¹ or θ ² is less than 90°. Fiber manufacturing method.
10. The method of claim 9, wherein the spinneret is multilobed.

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