KR100990991B1 - Crystalline polyester conjugate fiber having low melting point and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A crystal low melting point polyester composite fiber and a method for manufacturing the same are provided to use a crystal low melting point polyester as a sheath component, thereby improving the thermal stability and adhesive strength in high temperature. CONSTITUTION: Crystalline polyester having a low melting point includes distributing plate(110) distributing sheath component and core component and a nozzle plate(200) forming a spinning nozzle(210). A discharge hole(110) for discharging the core component is formed on lower part of the core component supply path(120). In nozzle plate, the discharging nozzle is formed on lower part of the discharge hole. A nozzle path(230) is formed to constant length. Sheath component of the sheath component supply unit(140) is induced through the induction tube to upper part of the nozzle path.

Description

Crystalline low melting point polyester composite fiber and its manufacturing method {Crystalline polyester conjugate fiber having low melting point and Manufacturing method

The present invention relates to a uniform crystalline low-melting polyester fiber of a fiber cross section with a sheath-core type composite fiber having excellent adhesion and having good heat resistance and good adhesion.

Conventional low melting polyester fibers have been widely used as a hot melt binder fiber for the purpose of adhering heterogeneous fibers in mutual fiber structures used in manufacturing mattresses, interior materials for automobiles or various nonwoven fabrics.

For example, U.S. Patent No. 4,129,675 introduces low-melting co-polyesters copolymerized using terephthalic acid and isophthalic acid, but the patent has disadvantages in terms of heat resistance and moldability in processing due to no melting point due to the properties of the copolymer material. Products with thermal deformation have limitations in use. In particular, in the case of industrial textile products used in a high temperature atmosphere of the glass transition or more there is a problem that the strength of the fiber is lowered in the high temperature atmosphere and the adhesive strength is significantly reduced.

In addition, U.S. Patent No. 3,589,956 discloses a method for producing a fiber that can form a low density nonwoven fabric in a stable manner, and a sheath-core composite spinning prepared therefrom, but the fiber produced by the method also has a reduced strength and adhesion. The problem of falling strength is still not solved.

In addition, Japanese Patent Application Laid-open No. Hei 10-298271 uses adipic acid instead of terephthalic acid in the process of polymerization to improve crystallinity and heat resistance, and uses 1,4-butanediol as a diol component instead of ethylene glycol. BD) improves adhesiveness and provides fibers with low fiber strength deterioration even in high temperature atmospheres.However, this method also has various cross-sections of the fiber yarns, which makes it difficult to operate the production speed normally during sizing or tricot work. Discomfort occurs and a problem that the adhesive strength is lowered.

The present invention has been invented to solve the above problems, and an object of the present invention is to provide a crystalline low melting point polyester composite fiber having excellent heat resistance and heat adhesive strength and a method of manufacturing the same.

In addition, in order to manufacture a yarn having a uniform cross-sectional shape during spinning of the crystalline low-melting polyester composite fiber, various spinnerets for the sheath core are designed to provide uniformity as well as post-sizing and It is an object of the present invention to provide a crystalline low melting polyester fiber having uniformity in work during tricot work and excellent adhesion in the final bonding process.

Another object of the present invention is to provide a filter such as a head tie, a fabric such as a damask, a water purifier, and the like using the crystalline low melting polyester composite fiber of the present invention.

In the present invention, the cis portion is 80 to 95 mol% of terephthalic acid (TPA), 5 to 20 mol% of adipic acid (APA), 20 to 80 mol% of ethylene glycol (EG), and 20 to 80 1,4-butanediol (BD). It is a crystalline low melting point polyester having a melting point of 140 to 200 ° C. and an intrinsic viscosity of 0.52 or more, and the core part of the mol% diol component provides a crystalline low melting point polyester composite fiber characterized by being composed of ordinary polyester.

In addition, the cis portion is 80 to 95 mol% of terephthalic acid (TPA), 4 to 15 mol% of adipic acid (APA), 1 to 5 mol% of isophthalic acid (IPA), 20 to 80 mol% of ethylene glycol (EG), 1,4-Butanediol (BD) A crystalline low melting polyester having a melting point of 140 to 200 DEG C and an intrinsic viscosity of 0.52 or more, prepared from 20 to 80 mol% of a diol component, wherein the core portion is made of a general polyester. It provides a low melting polyester composite fiber.

In addition, the area ratio of the sheath portion and the core portion provides a crystalline low melting polyester composite fiber, characterized in that 20:80 to 60:40.

In addition, the present invention provides a woven fabric which is made of the above crystalline low melting polyester composite fiber.

In addition, the present invention provides a filter which is made of the above crystalline low melting polyester composite fiber.

In addition, the present invention is 80 to 95 mol% of terephthalic acid (TPA), 5 to 20 mol% of adipic acid (APA), 20 to 80 mol% of ethylene glycol (EG), 20 to 80 of 1,4-butanediol (BD) Ester reaction step of esterifying mol% diol component under 1100 ~ 1350 Torr pressure at 245 ~ 255 ° C. and polycondensation by heating up to 260 ~ 270 ° C. while gradually reducing the final pressure to 0.5 Torr. Sheath part manufacturing process of crystalline low melting point polyester prepared by polycondensation step: Spinning process for producing composite fiber by spinning the above crystalline low melting point polyester with sheath part and general polyester to core part ; It provides a method for producing a crystalline low-melting polyester composite fiber, characterized in that it comprises a drawing step of stretching the fiber produced by the spinning process at a draw ratio of 1.5 ~ 4.0.

In addition, 80 to 95 mol% of terephthalic acid (TPA), 4 to 15 mol% of adipic acid (APA), 1 to 5 mol% of isophthalic acid (IPA) and 20 to 80 mol% of ethylene glycol (EG), 1,4 Butanediol (BD) Ester reaction step to esterify the diol component of 20 to 80 mol% at 1245 to 1350 Torr pressure at 245 to 255 ° C and the ester reactant is gradually reduced to a final pressure of 0.5 Torr. Sheath part manufacturing process of the crystalline low melting polyester manufactured by the polycondensation step of carrying out polycondensation by heating up to 270 degreeC; Spinning process for producing a composite fiber by spinning the crystalline low-melting point polyester to the sheath portion and the general polyester to the core portion using a spinneret for sheath core; It provides a method for producing a crystalline low-melting polyester composite fiber, characterized in that it comprises a drawing step of stretching the fiber produced by the spinning process at a draw ratio of 1.5 ~ 4.0.

In addition, the area ratio of the sheath portion and the core portion provides a method for producing a crystalline low melting polyester composite fiber, characterized in that 20:80 to 60:40.

In addition, the polycondensation step provides a method for producing a crystalline low-melting polyester composite fiber, characterized in that the addition of 0.02 ~ 0.04wt% antimony trioxide, 0.005 ~ 0.015wt% tetrabutyl titanate relative to the ester reactant.

In addition, the spinneret for the sheath core is composed of a nozzle plate formed with a distribution plate and a spinning nozzle for dispensing the sheath component and the core component, wherein the distribution plate is formed with a core component supply passage and a sheath component supply passage, respectively; A discharge hole for discharging the core component is formed at a lower end of the nozzle plate, and the nozzle plate has a nozzle formed at a lower end of the discharge hole and having a nozzle length having the same diameter as that of the radiation nozzle. It provides a method for producing a crystalline low-melting polyester composite fiber, characterized in that consisting of an induction pipe leading the sheath component supplied from the sheath component supply to the nozzle.

In addition, the diameter (D) of the spinning nozzle provides a method for producing a crystalline low melting polyester composite fiber, characterized in that the length (L) to the nozzle is 1.0 ~ 3.0mm.

In addition, when the diameter of the spinning nozzle D, the length of the nozzle to L provides a method for producing a crystalline low melting polyester composite fiber, characterized in that D / L is 1.5 ~ 5.0.

In addition, it provides a method for producing a crystalline low melting polyester composite fiber, characterized in that the discharge pin of the cylindrical shape having a predetermined length in the discharge hole is formed.

In addition, when the length of the discharge pin ℓ, the length to the nozzle L provides a method for producing a crystalline low melting polyester composite fiber, characterized in that l / L is 1.5 ~ 5.0.

In addition, it provides a fabric characterized in that the crystalline low melting polyester composite fiber produced by the above production method.

In addition, the present invention provides a filter, which is made of a crystalline low melting polyester composite fiber produced by the above method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms "about "," substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

The crystalline low melting polyester composite fiber according to the present invention is an acid component of terephthalic acid (TPA), adipic acid (APA) and ethylene glycol (ethylene glycol: EG), 1,4-butanediol (1,4 -butanediol: It is prepared by forming crystalline low melting polyester made of diol component of BD) as sheath part and general polyester as core part.

When the crystalline low melting polyester forming the sheath portion has a crystal melting point of less than 140 ° C., the crystal becomes low when used as a fused fiber, thereby reducing thermal instability as well as the strength of the fiber. Since the melting point and the difference of the fibers are small, it is difficult to give an adhesion temperature to the fibers adhering together with the fibers of the core part when heat is applied.

The low melting point polyester having a crystal melting point of 140 ° C. to 200 ° C. has 80 to 95 mol% of terephthalic acid (TPA), 5 to 20 mol% of adipic acid (APA), 20 to 80 mol% of ethylene glycol (EG), 1,4-butanediol (BD) 20 to 80 mol% of the diol component can be obtained by copolymerization by adjusting the molar ratio of the acid component and the diol component to form a crystal within the molar ratio range.

Adipic acid (APA) used in the present invention is an aliphatic substance that serves to lower the melting point of the polymer after copolymerization, but does not significantly interfere with crystallinity as compared to isophthalic acid (IPA) and in the nonwoven state after fiber formation. Compared to the general low melting point fibers, the tear strength significantly increases.

Acid content of the present invention is 80 to 95 mol% of terephthalic acid (TPA), 5 to 20 mol% of adipic acid (APA), and when the adipic acid (APA) is used less than 5 mol%, there is a limit in melting point reduction, 20 mol% If exceeded, there is a limit to the use of low melting point polyester having heat resistance due to low glass transition temperature as well as a decrease in crystallinity.

A part of the content of adipic acid (APA) is lower than the melting point of the polyester using isophthalic acid (isophthalic acid: IPA), but if it exceeds 5 mol% of the tear steel of the fiber produced to interfere with the crystallinity of the polyester It is preferable to use 1 to 5 mol% of the acid component when isophthalic acid (IPA) is used because the physical properties such as FIG.

The content of 1,4-butanediol (BD) for the diol component is low in crystallinity when the content of 1,4-butanediol in the diol component is less than 10 mol%, and too high when the content is 70 mol% or more. The fusion property is inferior, and the satisfaction of the required physical properties is inferior. Therefore, the content of the diol component may be 20 to 80 mol% of ethylene glycol (EG), 20 to 80 mol% of 1,4-butanediol (BD).

Therefore, the crystalline low melting polyester forming the sheath portion of the composite fiber of the present invention has a physical property of melting point of 140 to 200 DEG C and intrinsic viscosity of 0.52 or more.

The above crystalline low melting point polyester is formed by the sheath portion and the general polyester is formed by the core portion to form the crystalline low melting point polyester according to the present invention.

When the sheath portion is formed to less than 20% of the fiber cross-sectional area, the adhesion of the fiber is lowered. If the sheath portion exceeds 60%, the area ratio of the sheath portion and the core portion is 20:80 to 60: It would be desirable to be 40.

The method for producing a crystalline low melting polyester composite fiber according to the present invention is manufactured by a sheath part manufacturing process, a spinning process, and a stretching process.

The cis part manufacturing process proceeds to an ester reaction step and a polycondensation step.

The ester reaction step is 80 to 95 mol% of terephthalic acid (TPA), 5 to 20 mol% of adipic acid (APA) and 20 to 80 mol% of ethylene glycol (EG), 20 to 80 of 1,4-butanediol (BD) When mixing mol% of diol or using isophthalic acid (IPA), 65 ~ 80 mol% of terephthalic acid (TPA), 15-30 mol% of adipic acid (APA) and 5-10 mol of isophthalic acid (IPA) 20-80 mol% of ethylene glycol (EG) and 20-80 mol% of 1,4-butanediol (BD) are mixed and transesterified under 1100-1350 Torr pressure at 245-255 ° C. Prepare the ester reactant.

In the polycondensation step, the ester reactant is heated up to 260-270 ° C. while gradually reducing the final pressure to 0.5 Torr to polycondensate the crystalline low melting point polyester to produce a crystalline low melting point polyester.

In order to shorten the reaction time by promoting the polycondensation reaction in the polycondensation step, antimony trioxide 0.02 ~ 0.04wt%, tetrabutyl titanate may be further added 0.005 ~ 0.015wt%.

The spinning process is to produce a composite fiber by spinning the crystalline low-melting point polyester prepared as a sheath part and a general polyester as a core part using a spinneret for the sheath core.

The area ratio of the sheath portion and the core portion may be preferably 20:80 to 60:40.

The stretching process is a process for producing a crystalline low-melting polyester composite fiber by stretching the fibers produced by the spinning process at a draw ratio of 1.5 ~ 4.0 can be carried out in the same manner as the stretching process of general synthetic fibers.

The uniformity of the fiber cross-section of the sheath-core of the crystalline low-melting polyester composite fiber according to the present invention has a large effect on the quality and difficult to commercialize when the fiber cross-section is uneven, so the low-melting polyester of the present invention in the spinning process It would be desirable to use the spinneret for the sheath core shown in FIGS. 2 and 3 for morphological stability and uniformity of the fiber cross section of the sheath-core of the composite fiber.

The spinneret for the sheath core is composed of a distribution plate 100 for dispensing the sheath component and the core component and a nozzle plate 200 having a spinneret as shown in FIG. 2.

The distribution plate 100 is formed of a core component supply passage 120 and a sheath component supply passage 140, respectively. The sheath component supply passage 140 may be formed in a number around the core component supply passage 120.

A discharge hole 110 through which the core component is discharged is formed at the lower end of the core component supply passage 120,

The nozzle plate 200 has a spinning nozzle 210 formed at a lower end of the discharge hole 110 and a nozzle having a diameter the same as that of the spinning nozzle 210 has a predetermined length, and is supplied from the sheath component supply unit 140 to the top of the nozzle 230. It is composed of an induction pipe 250 to guide the prepared sheath component to 230 to the nozzle.

The core component is discharged through the discharge hole 110 is supplied to the nozzle 230 and the sheath component is supplied to the nozzle 230 through the guide pipe 250 to form a sheath-core in the nozzle 230 to be emitted through the spinning nozzle 210.

The induction pipe 250 should be formed in a V-shape in the overall cross-sectional shape so that the sheath component supplied from the sheath component supply unit 140 may be led to the nozzle 230.

The diameter (D) of the spinning nozzle is preferably 0.15 ~ 0.5mm, the length (L) to the nozzle may be adjusted to an appropriate length according to the diameter of the spinning nozzle, but it will be preferable that it is 1.0 ~ 3.0mm.

The nozzle 230 is a place where the sheath component and the core component of the composite fiber of the present invention are bonded to each other to form a fiber cross section of the sheath-core. Should be adjusted according to the diameter of the spinning nozzle. When the diameter of the spinning nozzle is D, the length to the nozzle L is preferably D / L is formed in 1.5 ~ 5.0.

In order to further improve the uniformity of the fiber cross-section of the composite fiber of the present invention further formed a discharge pin 300 of a cylindrical shape having a predetermined length in the discharge hole 110 and the core component flowing out of the core component supply path to the nozzle 230 more Can be supplied stably.

When the length of the discharge pin is L the length of the discharge pin, L to the length of the nozzle it will be preferable that L / L is formed in 1.5 ~ 5.0.

The crystalline low-melting polyester composite fiber according to the present invention according to the above description is excellent in heat resistance, which is excellent in operations such as sizing, tricord, etc., by producing a homogeneous yarn in a crystalline molecular structure material and spinning process. As a crystalline low melting point fusion fiber, it can be used in textiles such as head ties or damasks, which are traditional European products, and can be used in various industrial hot melt materials as it is useful for purification filters such as water purifiers.

As described above, the present invention uses the crystalline low melting point polyester as the sheath component to provide a low melting point polyester composite fiber having excellent thermal stability and adhesion strength at a high temperature and a soft touch, and a method of manufacturing the same. There is.

In addition, the present invention provides a heat-bonded composite fiber having a uniform cross section of the fiber and excellent workability of a post-processing (sizing or tricoat) process using a spinneret for sheath core.

In addition, due to the physical properties of the crystalline low-melting polyester composite fiber of the present invention there is an effect that can be used for water purifier filters or head-ties of the European traditional household products at high temperatures for the purpose of bonding each other.

Hereinafter, an embodiment of a method for producing the crystalline low melting polyester composite fiber of the present invention is shown, but is not limited thereto.

Example  One

The copolymerization composition ratio of terephthalic acid (TPA) / adipic acid (APA) as an acid component and the copolymerization composition ratio of ethylene glycol (EG) / 1,4-butanediol (BD) as a diol component were adjusted as shown in Table 1 below, and 250 ° C. It was added within the conditions and esterified under 1140 Torr pressure. (Reaction rate 97.5%)

The ester reactant was transferred to a polycondensation reactor, and 0.03 wt% of antimony trioxide and 0.01 wt% of tetrabutyl titanate were added to the ester reactant, and the polycondensation reaction was carried out by gradually increasing the temperature to 260 ° C while reducing the final pressure to 0.5 torr. It was.

The copolymerized crystalline low melting point polyester was used as the cis component, and the core component was spun through the spinneret of FIG. 3 using a conventional polyethylene terephthalic acid chip to spin the area ratio of the cis-core to 3: 7, and the draw ratio was drawn at 3.0. A yarn having a cid-core structure of 75d / 24f was prepared through.

As the spinneret, spinnerets of the following Conditional Formulas (1) and (2) were used.

(1) D / L = 3.5

(2) ℓ / L = 4.0

D: diameter of spinning nozzle

L: length to nozzle

ℓ: length of discharge pin

Examples 2 to 3

The cis component is a copolymer composition ratio of terephthalic acid (TPA) / adipic acid (APA) as an acid component and the copolymer composition ratio of ethylene glycol (EG) / 1,4-butanediol (BD) as a diol component is adjusted as shown in Table 1 below. It prepared in the same manner as in Example 1.

Example  4 to 5

The cis component is a copolymer composition ratio of terephthalic acid (TPA) / adipic acid (APA) as an acid component and the copolymer composition ratio of ethylene glycol (EG) / 1,4-butanediol (BD) as a diol component is adjusted as shown in Table 1 below. Prepared in the same manner as in Example 1, the spinneret was used in the spinneret of the following condition formula (1), (2).

(1) D / L = 3.5

(2) ℓ / L = 2.0

D: diameter of spinning nozzle

L: length to nozzle

ℓ: length of discharge pin

Example  6 to 7

The cis component is a copolymer composition ratio of terephthalic acid (TPA) / adipic acid (APA) as an acid component and the copolymer composition ratio of ethylene glycol (EG) / 1,4-butanediol (BD) as a diol component is adjusted as shown in Table 1 below. Prepared in the same manner as in Example 1, the spinneret was used in the spinneret of Figure 2 as the spinneret of the following conditional formula (1).

(1) D / L = 3.5

D: diameter of spinning nozzle

L: length to nozzle

Comparative Example

The cis component was adjusted as shown in Table 1 by adjusting the copolymer composition ratio of terephthalic acid (TPA) / isophthalic acid (IPA) as the acid component and ethylene glycol (EG) as the diol component, as shown in Table 1 below. To prepare a spinneret, the spinneret of Example 6 was used.

division
Detention Type
(L / D ratio) Copolymer Composition Ratio (mol%) Acid Diol component TPA AA IPA EG BD Example 1 Pin type (4) 80 20 0 45 55 Example 2 Pin type (4) 82 18 0 50 50 Example 3 Pin type (4) 84 16 0 54 46 Example 4 Pin type (2) 86 14 0 58 42 Example 5 Pin type (2) 88 12 0 62 48 Example 6 Finless type 86 14 0 60 40 Example 7 Finless type 86 9 5 60 40 Comparative Example Finless type 73 0 27 100 0

* Physical properties of sheath components and strength measurement in nonwoven fabric manufacturing

Physical properties of the sheath components of the above examples and the comparative examples were measured by the following method, and the composite fibers prepared by the examples and the comparative examples were manufactured by using a nonwoven fabric and the strength thereof was measured.

1) Melting point and glass transition temperature measurement

Thermokinetic scanning calorimetry (Perkin Elmer) was used to measure the temperature at 20 ° C / min and the thermal behavior of the polymer was measured using DSC and DTA to see the sharpness of melting point and glass transition temperature.

2) Copolymerization mole% measurement

Reactive copolymer mol% was dissolved in trichloroacetic acid and analyzed by nuclear magnetic resonance apparatus (NMR). (DEG analysis was measured by gas chromatograph.)

3) Extreme viscosity (IV) measurement

Copolyester was dissolved in phenol / tetrachloroethane (weight ratio 60/40) and measured at 35 degreeC with the density | concentration 0.5g / kV Uberod viscometer.

4) Adhesive force measurement

The prepared heat-sealed nonwoven fabric was fixed at a density of 2g / 100㎠ and the high temperature adhesive force was measured and evaluated at a dry heat temperature of 100 ° C. using the ASDM D-1424 method (reference value is 25 ° C.).

division
Extreme viscosity
(η) Melting point
(℃) Glass transition temperature
(℃) Nonwoven Strong (g) Heat treatment temperature (℃) 25 ℃ 110 ℃ Example 1 0.67 152 64 180 2,700 2,250 Example 2 0.64 156 65 182 2,750 2,350 Example 3 0.66 160 63 184 2,700 2,150 Example 4 0.64 164 62 186 2,610 2,130 Example 5 0.65 169 61 190 2,550 2,100 Example 6 0.66 160 64 184 2,400 2,050 Example 7 0.67 155 63 171 2,380 2,030 Comparative Example 0.68 150 58 177 2,260 1,950

As shown in Table 2, it can be seen that the composite fiber prepared in the Examples is superior in physical properties and strength of the nonwoven fabric as compared to the composite fiber prepared in the Comparative Example. In addition, it can be seen that the nonwoven fabric made of the composite fiber manufactured by using the spinneret having the discharge pin is more excellent, and that even when the discharge pin is formed, the spinneret having l / L = 4.0 will have a better effect. Can be. It can be seen that the longer the discharge pin in the spinneret, the longer the cross section of the fiber increases the adhesive strength of the manufactured nonwoven fabric.

The composite fiber obtained in the above examples was woven into a tricoat and then applied to a filter for water purifier, and the quality was good. In addition, crystalline low-melting composite fibers were applied instead of resins (resins) used in the past in the weaving and dyeing process through the sizing process to manufacture head tie products. And it was confirmed that the process workability is very excellent.

1 is a process drawing of a crystalline low melting polyester composite fiber according to the present invention,

Figure 2 is a spinneret of a preferred embodiment of the composite fiber production according to the present invention,

Figure 3 is a spinneret of another preferred embodiment of the composite fiber production according to the present invention.

DESCRIPTION OF THE RELATED ART [0002]

100: distribution plate 110: discharge hole

120: sheath component supply passage 140: core component supply passage

200: nozzle plate 210: nozzle

230: 250 nozzles: induction pipe

300: discharge pin

Claims (16)

The cis part contains 80 to 95 mol% of terephthalic acid (TPA), 5 to 20 mol% of adipic acid (APA), 20 to 80 mol% of ethylene glycol (EG) and 20 to 80 mol% of 1,4-butanediol (BD). Melting point is made of a diol component is a crystalline low-melting polyester of 140 ~ 200 ℃, the ultimate viscosity of 0.52 or more, the core portion is composed of a general polyester, The crystalline low melting polyester is composed of a distribution plate for dispensing the sheath component and the core component and a nozzle plate formed with a spinneret, wherein the distribution plate is formed with a core component supply passage and a sheath component supply passage, respectively. A discharge hole for discharging the core component is formed at a lower end of the nozzle plate, and the nozzle plate has a nozzle formed at a lower end of the discharge hole and having a nozzle length having the same diameter as that of the radiation nozzle. It consists of an induction pipe to guide the sheath component supplied from the sheath component supply to the nozzle, the diameter (D) of the spinning nozzle is 0.15 ~ 0.5mm and the length (L) to the nozzle is spinneret of 1.0 ~ 3.0mm Crystalline low melting polyester composite fiber, characterized in that is produced by spinning. delete The method of claim 1, The area ratio of the sheath portion and the core portion is 20:80 to 60:40 crystalline low melting polyester composite fiber, characterized in that. A woven fabric characterized in that it is made of the crystalline low melting polyester composite fiber of claim 1. A filter comprising the crystalline low melting polyester composite fiber of claim 1. 80 to 95 mol% of terephthalic acid (TPA), 5 to 20 mol% of adipic acid (APA), 20 to 80 mol% of ethylene glycol (EG), and 20 to 80 mol% of diol component of 1,4-butanediol (BD) Produced in the polycondensation step of increasing the temperature to 260 ~ 270 ℃ while gradually reducing the ester reaction step and ester ester reacting the ester reactant to a final pressure of 0.5 Torr at 245 ~ 255 ℃ 1100 ~ 1350 Torr (Torr) pressure Sheath part manufacturing process of crystalline low melting polyester which become; Spinning process for producing a composite fiber by spinning the crystalline low-melting point polyester to the sheath portion and the general polyester to the core portion using a spinneret for sheath core; It includes an stretching process for stretching the fiber produced by the spinning process at a stretching ratio of 1.5 ~ 4.0, The spinneret for the sheath core is composed of a nozzle plate formed with a distribution plate and a spinning nozzle for dispensing the sheath component and the core component, The distribution plate is formed with a core component supply passage and a sheath component supply passage, respectively, and a discharge hole for discharging the core component is formed at the lower end of the core component supply passage, The nozzle plate has a spinning nozzle formed at a lower end of the discharge hole and a nozzle path having the same diameter as the spinning nozzle is formed to have a predetermined length, and the sheath component supplied from the sheath component supply unit to the nozzle is directed to the nozzle. It consists of a guide pipe, The diameter (D) of the spinning nozzle is 0.15 ~ 0.5mm and the length (L) to the nozzle is a method for producing a crystalline low melting polyester composite fiber, characterized in that 1.0 ~ 3.0mm. delete The method of claim 6, The area ratio of the sheath portion and the core portion is 20:80 to 60:40 crystalline low melting point polyester composite fiber production method. The method of claim 6, Method for producing a crystalline low melting polyester composite fiber, characterized in that the addition of 0.02 ~ 0.04wt% antimony trioxide, 0.005 ~ 0.015wt% tetrabutyl titanate compared to the ester reactant in the polycondensation step. delete delete The method of claim 6, When the diameter of the spinning nozzle D, the length of the nozzle to L D / L is a method for producing a crystalline low melting polyester composite fiber, characterized in that 1.5 to 5.0. The method of claim 6, Method for producing a crystalline low melting polyester composite fiber, characterized in that the discharge pin of the cylindrical shape having a predetermined length in the discharge hole is formed. The method of claim 13, When the length of the discharge pin ℓ, the length of the nozzle to L ℓ / L is a method for producing a crystalline low melting polyester composite fiber, characterized in that 1.5 ~ 5.0. A woven fabric characterized in that it is made of crystalline low melting polyester composite fibers prepared by the method of claim 6. A filter comprising a crystalline low melting polyester composite fiber produced by the manufacturing method of claim 6.

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