TWI758566B - High tenacity fine denier polyester multifilament - Google Patents

Abstract

The polyester multifilament of the present invention is composed of a high-viscosity polyester of a core component and a low-viscosity polyester of a sheath component to form a core-sheath polyester multifilament; wherein, the intrinsic viscosity difference between the core component and the sheath component is 0.20~ 1.00, and the total fineness is 4~30dtex, the monofilament fineness is 1.0~5.0dtex, the breaking strength is 5.0~9.0cN/dtex, the breaking elongation is 12~45%, the interlacing degree is 2.0~15.0 pieces/m, and the thread count is 3~15.

The polyester multifilament provided by the present invention is a fine denier polyester multifilament with high strength, excellent abrasion resistance and bundling property, and can obtain both excellent durability, weaving property and fabric quality, and is quite suitable for use in High-density thin fabric for sports and outdoor applications.

Description

High tenacity fine denier polyester multifilament

The present invention relates to a high-strength, fine-denier multifilament of a high-density thin fabric with excellent weaving properties and abrasion resistance, which is especially suitable for sports and outdoor special clothing.

Up to now, there have been many proposals for high-density fabrics using synthetic fiber multifilaments such as polyester and nylon, mainly for sportswear, airbags, etc. And along with this, high-strength fabrics are also required. In particular, it is a special sports and outdoor fabric, and the durability improvement requirements for intense action are increased, and the abrasion resistance of the fabric is expected to be improved.

The single-component polyester multifilament fabric proposed in Patent Document 1 has high strength by setting the intrinsic viscosity of polyethylene terephthalate to 0.70 to 1.20, and 60% or more of the total titanium oxide particles are primary Titanium oxide with a particle size of 0.1 to 0.6 μm contains 0.3 to 0.8 weight (wt) %, thereby improving the weaving property.

Furthermore, in order to reduce the thickness, the total fineness of the filament must be reduced, and the count of the filament constituting the filament must be reduced. Therefore, it is difficult to join the interlace (interlace, staggered), and the bundling property is poor. When the bundling property is poor, the smoothness of the manufacturing steps is poor, and the handling at the time of warping and weaving also becomes difficult. In addition, due to insufficient bundling properties, filament breakage (monofilament unraveling) occurs, poor handling of warp yarns during weaving, and warp yarn breakage is likely to occur. Warp yarn breakage not only causes downtime, but also requires a lot of manpower to reconnect the warp yarns to restore them, thereby causing a problem that productivity is greatly reduced. In addition, related fabric quality will also have filament breakage to form stripe-like defects. Patent Document 2 is to provide a polyamide multifilament with excellent bundling properties. Therefore, the proposal is not related to the total fineness of 6 to 18 dtex and the fineness. By setting the single-filament fineness to 0.8 dtex or less, the fineness is reduced and the interlacing is easy to be added. , so that the degree of interaction is more than 25.

In the polyester monofilament for stencil yarn proposed in Patent Document 3, the monofilament is a core-sheath type composite yarn, and the strength is increased by setting the limiting viscosity of the polyester used for the core component to 0.70 or more, and by The intrinsic viscosity of the polyester used for the sheath component is 0.15 to 0.30 lower than that of the core component, and residues are suppressed (abrasion resistance is improved).

[Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2009-074213 (paragraph numbers [0008] to [0009])

Patent Document 2: Japanese Patent Laid-Open No. 2009-013511 (paragraph numbers [0008] to [0009])

Patent Document 3: Japanese Patent Laid-Open No. 2003-213528 (paragraph numbers [0013] to [0014])

However, the single-component polyester of Patent Document 1 has a problem in abrasion resistance, and cannot meet the durability requirements of advanced applications.

Patent Document 2 does significantly improve weaving properties by increasing the degree of entanglement and improving the bundling properties. However, when the single-filament fineness is small, the warp and weft yarns are broken during weaving, resulting in a problem of pilling.

In Patent Document 3, it is difficult to form a high-density fabric with monofilaments, and because the monofilament has a high fineness, the rigidity of the fabric is high, and it is not suitable for clothing applications. In addition, when the technology of the core-sheath type composite yarn is applied to a fine-denier multifilament yarn, the core-sheath type composite yarn may be prone to sheath breakage if the single-filament fineness is reduced, and the sheath portion is too thin to obtain sufficient abrasion resistance. subject. On the other hand, when the single-filament fineness is increased, since the yarn count is reduced, it is difficult to form entanglements, which leads to the problems that the bundling property is deteriorated, and the weaving property and the fabric quality are deteriorated.

That is, it is difficult to obtain polyester multifilament yarns for thin fabrics that have both durability, weaving properties, and fabric quality required for advanced applications. Fine denier polyester multifilament.

In order to solve the problem of the prior art, the present invention provides high-strength and high-density thin fabrics with excellent durability, weaving properties, and fabric quality, which are suitable for sports and outdoor special clothing. Fine-denier polyester multifilament yarn with excellent abrasion resistance and bunching.

The object of the present invention can be achieved by the following polyester multifilament yarns.

A polyester multifilament is composed of high-viscosity polyester as a core component and low-viscosity polyester as a sheath component to form a core-sheath polyester multifilament; wherein the intrinsic viscosity difference between the core component and the sheath component is 0.20-1.00 , and the total fineness is 4~30dtex, the monofilament fineness is 1.0~5.0dtex, the breaking strength is 5.0~9.0cN/dtex, the breaking elongation is 12~45%, the entanglement degree is 2.0~15.0 pieces/m, and the number of wire counts is 3~15.

Furthermore, a polyester multifilament, the intrinsic viscosity of the high-viscosity polyester of the core component is 0.70-1.50, and the high-viscosity of the sheath component is 0.40-0.70.

The polyester multifilament of the present invention has high strength, excellent abrasion resistance and bundling properties, and can obtain high-density and thin-textured fabrics with excellent durability, weaving properties and fabric quality, which are quite suitable for sports and outdoor special clothing. fabric.

The polyester multifilament of the present invention will be described.

The polyester multifilament of the present invention is composed of a core-sheath type composite fiber arranged in such a manner that the core component is covered by the sheath component according to the cross section of the monofilament, and the core component is not exposed on the surface. It is generally known that in order to increase the strength of polyester fibers, it is only necessary to stretch at a high elongation ratio in the production process of the raw yarn, and to implement high orientation and high crystallization. If the total fineness is small and the density is high, the warp yarn will be subjected to more friction by the strong load of the reed, resulting in the problem of hair balls due to broken single filaments. In addition, a thin fabric used for advanced applications requires durability in friction, and improvement of the abrasion resistance of the raw yarn is an important issue.

In the polyester multifilament of the present invention, from the viewpoint of obtaining excellent abrasion resistance, the intrinsic viscosity of the polyester used for the sheath component must be lower than that of the core component polyester, and the difference is preferably 0.20 to 1.00. By setting the intrinsic viscosity difference to 0.20 or more, the polyester of the sheath component, that is, the degree of orientation and crystallinity of the fiber surface of the polyester multifilament can be suppressed, so that good abrasion resistance can be obtained. In addition, since the shear stress of the melt spinning on the inner wall surface of the discharge hole of the spinneret is borne by the sheath component, the shear force received by the core component is reduced, and the core component is discharged in a uniform state with low molecular chain alignment. Thus, the strength of the finally obtained polyester multifilament is increased. On the other hand, in order for the polyester multifilament to have high strength, the sheath component also needs to be properly oriented. Therefore, if the intrinsic viscosity difference is greater than 1.00, the satisfactory strand strength cannot be obtained. In addition, the preferred polyester intrinsic viscosity difference is 0.30 to 0.70.

The intrinsic viscosity of the high-viscosity polyester used as the core component of the polyester multifilament of the present invention is preferably in the range of 0.70 to 1.50. By making the intrinsic viscosity 0.70 or more, a polyester multifilament having sufficient strength and elongation can be produced. The more preferable intrinsic viscosity is 0.80 or more. In addition, from the viewpoint of ease of molding such as melt extrusion, the upper limit of the intrinsic viscosity is preferably 1.50 or less, and considering the production cost and the molecular weight reduction due to molecular chain scission due to heat or shear force during the production process , and melt flow stability, preferably 1.20 or less.

On the other hand, when the intrinsic viscosity of the low-viscosity polyester of the sheath component is set to 0.40 or more, stable spinning properties can be obtained. The more preferable intrinsic viscosity is 0.50 or more. Moreover, in order to obtain good abrasion resistance, it is preferable to set it as 0.70 or less.

As the polyester system of the polyester multifilament of the present invention, a polyester mainly composed of polyethylene terephthalate (hereinafter referred to as "PET") is used.

As the PET system used in the present invention, a polyester in which the acid component is mainly terephthalic acid, the diol component is mainly ethylene glycol, and 90 mol% or more is composed of ethylene terephthalate repeating units can be used. However, a copolymerization component capable of forming other ester bonds may be contained in a ratio of less than 10 mol %. Examples of acidic components of such copolymerization components include bifunctional aromatic carboxylic acids such as isophthalic acid, phthalic acid, dibromoterephthalic acid, naphthalenedicarboxylic acid, and octaethoxybenzoic acid; sebacic acid , bifunctional aliphatic carboxylic acids such as oxalic acid, adipic acid and dimer acid; dicarboxylic acids such as cyclohexanedicarboxylic acid; and diol components include, for example: ethylene glycol, diethylene glycol, Polyoxyalkylene glycols such as propylene glycol, butylene glycol, neopentyl glycol, bisphenol A, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, etc., are not limited to these.

Furthermore, if necessary, for example, titanium dioxide as a matting agent, fine particles of silicon dioxide or alumina as a lubricant, hindered phenol derivatives as antioxidants, and flame retardants, antistatic agents, and ultraviolet absorbers can also be added to PET. and coloring pigments.

In addition, since the PET of the core component is mainly responsible for the strength of the polyester multifilament, the inorganic particle additives such as titanium oxide are usually added to the polyester fiber in an amount of preferably 0.5 wt% or less. On the other hand, since the PET of the sheath component is mainly responsible for the abrasion resistance of the polyester multifilament, inorganic particles such as titanium oxide are preferably added at about 0.1 wt % to 0.5 wt %.

Next, the cross-sectional shape of the polyester multifilament of the present invention will be described.

As described above, the polyester multifilament of the present invention is a core-sheath type composite polyester multifilament arranged in such a manner that the core component is covered by the sheath component in the cross section of the monofilament, and the core component is not exposed on the surface. The term "core-sheath type" here means that the core component may be completely covered with the sheath component, and it does not necessarily have to be arranged concentrically. In addition, the relevant cross-sectional shape includes several shapes such as circle, flat, triangle, square, pentagon, etc., but from the viewpoint of easily obtaining stable threadability and high-order processability, and from the viewpoint of high density of the fabric, it is preferably round section.

In the present invention, because the core component and the sheath component are both polyester, the peeling phenomenon at the composite interface that often occurs in the polyester/nylon composite yarn is unlikely to occur. However, from the viewpoint of both the wear resistance improvement effect by the sheath component and the high strength by the core component, the composite ratio of the core component:sheath component is preferably set in the range of 60:40 to 95:5, The better composite ratio is set in the range of 70:30~90:10.

Here, the "composite ratio" defined in the present invention refers to the ratio of the cross-sectional area of the two types of polyesters constituting the monofilament in the photograph of the cross-section of the monofilament of the polyester multifilament.

The total fineness of the polyester multifilament of the present invention must be 4-30 dtex. By setting it to 4 dtex or more, silk production and weaving can be performed stably, and by setting it to 30 dtex or less, a target high-density thin fabric can be formed. The preferred total fineness range is 8~25dtex.

Furthermore, the monofilament fineness of the polyester multifilament of the present invention must be 1.0 to 5.0 dtex. When the single-filament fineness is less than 1.0 dtex, it is difficult to form the desired core-sheath cross-section, and sheath breakage occurs, the thickness of the sheath component becomes thin, and the abrasion resistance tends to be insufficient. In addition, there is a tendency for the smoothness of the steps such as silk production and weaving to deteriorate. Moreover, by setting it as 5.0 dtex or less, it becomes easy to provide an entanglement, and the effect of improving the bundling property and improving the smoothness of the process and the weaving property can be obtained. In addition, the obtained woven fabric maintains compactness, does not become too stiff, and has a good feel. The preferred range of monofilament fineness is 1.5~3.0dtex. If the monofilament fineness is not achieved as described above, in the production method of the polyester multifilament, the output amount and the spinning nozzle may be appropriately changed.

Furthermore, the yarn count of the polyester multifilament of the present invention must be 3 to 15. Interlacing can be easily added by setting the thread count to 3 or more. In addition, if the number of yarns is increased, the contact with the reed, the guide, etc. can be dispersed on each single yarn during weaving, so the friction load applied to the single yarn can be reduced, and the wear resistance of the raw yarn can be greatly improved. , The durability of the fabric. The upper limit of the yarn count varies according to the total fineness and single yarn fineness, and can be set below 15.

The polyester multifilament of the present invention must improve the bundling property in order to obtain excellent weaving properties and fabric quality. When the bundling property is insufficient, filament breakage (monofilament unraveling) occurs, the warp yarn handling during weaving is poor, and warp yarn breakage is likely to occur. Also, in terms of fabric quality, filament breakage can also be a defect in striped fabrics.

The polyester multifilament of the present invention must have a degree of entanglement of 2.0 to 15.0 pieces/m in terms of the number of entanglements per 1 m. If the degree of entanglement is less than 2.0 pieces/m, there is a tendency for the weaving property to deteriorate, such as warp yarn breakage. The resulting fabric tends to have the defect of striped fabric due to filament breakage, resulting in poor fabric quality. By setting the degree of entanglement to be 2.0 pieces/m or more, excellent weaving properties and fabric quality can be obtained. On the other hand, if the entanglement is too high, there will be too many restraint points, and as described above, during weaving, the contact with the reed, the guide, etc. is dispersed among the filaments, thereby reducing the friction load applied to the filaments. As a result, the abrasion resistance of the raw yarn and the durability of the fabric tend to be poor, so the degree of entanglement must be set to 15.0 pieces/m or less. In addition, in order to further increase the degree of entanglement, the load at the time of applying the entanglement step may increase, and many yarn breakages may occur, resulting in deterioration of productivity. The better interlaced degree range is 4.0~10.0 pieces/m.

By setting the breaking strength of the polyester multifilament of the present invention to 5.0 cN/dtex or more, sufficient mechanical properties can be obtained even in a thin fabric. More preferably, it is above 6.0cN/dtex. In addition, since it is necessary to suppress the orientation and the degree of crystallinity from the viewpoint of abrasion resistance, it is preferably not more than 9.0 cN/dtex, and more preferably not more than 8.0 cN/dtex.

Furthermore, the polyester multifilament of the present invention can suppress the occurrence of yarn breakage and the occurrence of pilling during weaving by setting the elongation at break to 12% or more, and is also excellent in handleability, and by setting it to 45% or less, The target breaking strength is obtained. The better elongation at break range is 17~35%.

Furthermore, the strength at 5% elongation (5% Mo) and the strength at 10% elongation (10% Mo) of the polyester multifilament of the present invention are preferably 5% Mo from the viewpoint of fabric dimensional stability. 3.5cN/dtex or more, preferably 3.8cN/dtex or more. 10%Mo is preferably 4.0cN/dtex or more, more preferably 4.5cN/dtex or more. In addition, from the viewpoint of abrasion resistance, 5% Mo is preferably 6.0 cN/dtex or less, more preferably 5.0 cN/dtex or less, in order to suppress the orientation and the degree of crystallinity. 10%Mo is preferably below 8.0cN/dtex, more preferably below 7.0cN/dtex.

Next, the preferable manufacturing method of the polyester multifilament of this invention is demonstrated.

The manufacturing method of the polyester multifilament of the present invention is characterized in that the position where the entanglement is provided is set after the drawing. If interlacing is provided at the stage of undrawn yarn, interlacing is not easy to be added within the range of the total fineness, single-filament fineness, and yarn count of the multifilament of the present invention. Therefore, the target entanglement degree can be achieved by providing entanglement at the stage where the monofilament fineness becomes smaller after stretching.

In addition, a well-known entanglement nozzle can be used for the method of providing an entanglement to the polyester multifilament of this invention. The interlaced compressed air pressure is preferably set at 0.10 to 0.40 MPa. If it is less than 0.10MPa, it is difficult to add sufficient interlacing; if it exceeds 0.40MPa, many yarn breaks will occur, resulting in poor productivity. More preferably, it is 0.15~0.30MPa.

The spinning method of the polyester multifilament of the present invention is not particularly limited, and can be based on known techniques. For example, the high-viscosity PET of the core component and the low-viscosity PET of the sheath component are respectively melt-extruded, and then fed into a predetermined composite spinneret using a composite spinning machine. The spinneret is attached and spun to form a core-sheath type, and then the yarn spun out from the spinneret is drawn to obtain an undrawn yarn. A two-step method in which the undrawn filament is first coiled and then extended by a drawing machine can be adopted, or a single-step method in which the undrawn filament is directly followed by extending without first being wound up can be adopted, but it will be described later. When the interlace is imparted, it is difficult to add the interlace if the wire speed is faster, so the two-step method is preferably used.

The stretching method of the polyester multifilament of the present invention is not particularly limited, and can be based on known techniques. For example, a method of applying one-stage heating and stretching heat between a first heating roll and a second heating roll; a method of applying one-stage heating and stretching using a first heating roll and a non-heating roll, and a heating plate between the rolls; and A method of performing the first-stage heating and stretching between the first heat roll and the second heat roll, and then performing the second-stage heating and stretching between the second heat roll and the third heat roll is appropriately selected. In particular, in order to achieve high strength, the unstretched yarn must be stretched at a high rate. However, if one-stage stretching is adopted, the stretching tension will increase, which will lead to problems such as increased silk spots and many yarn breaks. Therefore, it is better to use An extension of more than two paragraphs.

Furthermore, the stretching temperature of the polyester multifilament of the present invention is preferably set to the glass transition temperature of the high-viscosity PET of the core component +10 to 30° C. for the first heat roll when it is stretched in one stage, and the second heat roll or The heating plate is set in the range of 130~230℃. By setting it to 130 degreeC or more, an orientation can be controlled, crystallization of a fiber can be accelerated|stimulated, and it can become high intensity|strength. On the other hand, when the temperature is 230° C. or lower, the occurrence of welding on the hot roll or the hot plate can be prevented, and the yarn formability can be improved. During multi-stage stretching, the first hot roll is preferably set to the glass transition temperature of the high-viscosity PET of the core component +10~30°C, and the temperature is gradually increased after the second hot roll, and preferably the last hot roll is set. Set to the range of 100~230°C.

Furthermore, the total draw ratio of the polyester multifilament of the present invention is preferably 3.0 to 7.0 times. The better system is 3.5~6.0 times, and the extra-best system is 3.8~5.0 times.

[Example]

Hereinafter, the polyester multifilament of the present invention will be specifically described by way of examples. The measured values of the examples were measured according to the following methods.

(1) Intrinsic viscosity (IV)

The relative viscosity ηr defined by η/η ₀ is obtained by dissolving 0.8 g of the sample polymer in 10 mL of ortho-chlorophenol (hereinafter referred to as "OCP") with a temperature of 25 °C and a purity of more than 98% to form a polymer solution, and at a temperature of 25 °C. Below, it is obtained from the following formula using an Oswaal viscometer. The intrinsic viscosity (IV) was calculated from the following formula by ηr.

ηr=η/η ₀ =(t×d)/(t ₀ ×d ₀ )

Intrinsic viscosity (IV)=0.0242ηr+0.2634

Where, η: viscosity of polymer solution η ₀ : viscosity of OCP t: drop time of solution (seconds) d: density of solution (g/cm ³ ) t ₀ : drop time of OCP (seconds) d ₀ : Density of OCP (g/cm ³ )

(2) Total fineness (dtex)

The yarn was twisted by a 500m coiling tube, and the value obtained by multiplying the mass (g) of the coiling tube by 20 was set as the fineness.

(3) Breaking strength (cN/dtex) and breaking elongation (%), strength at 5% elongation (modulus) (cN/dtex) and strength at 10% elongation (modulus) (cN/dtex)

According to JIS L1013 (1999), the measurement was performed using a tensioner UCT-100 manufactured by ORIENTEC.

(4) Degree of intersection (pieces/m)

The silk thread was floated on the water surface, and the number of converging points per 1 m was measured and set as the degree of entanglement. The measurement was performed 10 times, and the average value was calculated.

(5) Abrasion resistance of raw yarn

Apply a wire tension of 0.9g/dtex to the wire, press it against the flat part of the reed (material: SK material, width 7mm×length 50mm×thickness 50μm) according to the contact angle of 20°, and then according to the stroke length of 30mm and the speed of 670 times 10 minutes of reciprocating movement per minute. The yarn after the treatment was magnified and observed under a microscope, and the case where no hair balls and fibrillation (surface cutting) were found was rated as "A", and the case where it was found was rated as "C".

(6) Weaving evaluation and weaving quality

Using a water jet shuttleless loom, and adjusting with the total fineness of the filaments used, the apparent weaving density is in the range of 30 to 35 g/m ² . The weaving property was rated as "S" if the number of stoppages per 100m due to yarn breakage, etc. was less than 3 times, "A" if it was more than 3 times and less than 10 times, and "A" if it was more than 10 times. "C". The total number of defects such as hair balls and filament breaks are counted in the fabric quality system, and those with less than 3 per 100m are rated as "S", those with more than 3 and less than 10 are rated as "A", and those with less than 3 10 or more were rated as "C".

(7) Fabric abrasion resistance

The abrasion resistance of the fabric was implemented according to the E method (MARTINDALE method) in accordance with JIS L1096 (2010). The test conditions were carried out using a standard rubbing cloth made of polyester, and a pressing load of 9 kPa was used. Judgment is based on the number of abrasions until the appearance of the hairball, with 5,000 or more times as "A", 3,000 or more but less than 5,000 times as "B", and less than 3,000 times as "" C".

Regarding the production methods of Examples and Comparative Examples, polyester filaments were obtained according to known techniques according to the production conditions shown in Tables 1 to 3.

[Example 1]

PET with an intrinsic viscosity of the core component of 0.80 and PET with an intrinsic viscosity of the sheath component of 0.50 are melted at a temperature of 295°C using an extrusion extruder, and then the polymer temperature is 290°C, and the composite ratio becomes the core component. : Sheath composition = 80:20, the pump metering was performed, and it flowed into a well-known composite spinneret having 5 holes of the core-sheath type. The yarn spun out from the spinneret was first wound at a spinning speed of 1,200 m/min, and then, using a known stretching device, between the first heat roll heated to 90°C and the second heat roll heated to 130°C in accordance with The stretching was performed at a stretching ratio of 4.2 times, and heat setting was performed. The obtained drawn yarn was wound at 800 m/min after providing an entanglement at an entanglement pressure of 0.23 MPa using an entanglement nozzle provided between the last roll and the winder. There was no particular problem in spinning properties, and a polyester multifilament yarn with a total fineness of 12.0 dtex, a single yarn fineness of 2.4 dtex, a breaking strength of 6.5 cN/dtex, an elongation at break of 17.7%, and a degree of entanglement of 5.8 pieces/m was obtained. The polyester multifilament yarn has good abrasion resistance. The physical properties of other precursors are shown in Table 1.

Using this polyester multifilament yarn, weaving was performed so that the apparent density would be 30 g/m ² by a water jet shuttleless loom. In 100m weaving, no yarn breakage occurred even once, showing very good weaving properties. The obtained fabric also has no hairballs and other defects, and is of very good weaving quality. In addition, the abrasion resistance of the fabric was in a good state without generation of hair balls even if the number of abrasions was 6,000 times.

[Examples 2 to 3]

A polyester multifilament was obtained in the same manner as in Example 1, except that the draw ratios were respectively 3.9 times and 3.6 times. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 1. In both Examples 2 and 3, no yarn breakage occurred even once in the weaving process of 100 m, showing very good weaving properties. The obtained fabric also has no hairballs and other defects, and is of very good weaving quality. In addition, the abrasion resistance of the fabric was in a good state without generation of hair balls even if the number of abrasions was 6,000 times.

[Examples 4 to 5], [Comparative Examples 1 to 2]

A polyester multifilament was obtained in the same manner as in Example 1 except that the interlacing pressure was changed within the range of 0.08 to 0.42 MPa. The physical properties of the obtained polyester multifilament are shown in Table 1. The degree of entanglement in Example 4 was 9.9 pieces/m, and good results were obtained in the same manner as in Example 1 in terms of yarn abrasion resistance, weaving properties, weaving quality, and fabric abrasion resistance. The degree of intertwining in Example 5 is 4.2 pieces/m, because the bundling property is slightly inferior to that of Example 1, so yarn breakage occurs 3 times in 100m weaving, but it is still a good weaving property. Although the obtained fabric had no hair balls, it had the defect of filament breakage, which was inferior to Example 1. In Comparative Example 1, the interlacing pressure was high, and the pendulum yarn at the interlacing position was increased, resulting in yarn breakage. The degree of intertwining is as high as 15.3 pieces/m, and the abrasion resistance of the raw yarn is easy to produce hairballs, which is inferior to Example 1. The yarn breakage during weaving was 6 times, and the weaving quality had hairballs, which was inferior to Example 1. In addition, as for the abrasion resistance of the fabric, fuzz occurred when the number of abrasions was 3,500 times. In Comparative Example 2, the entanglement pressure was low, the entanglement degree was 1.7 pieces/m, and the entanglement could not be sufficiently added. During the weaving process, many warp yarn breaks occurred, and the machine stopped every few meters. The quality of weaving is that the filaments are broken and many stripes are found.

[Comparative Example 3]

A polyester multifilament was obtained in the same manner as in Example 1, except that the interlacing position was set before spinning and winding. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 2. The degree of entanglement was 0.8 pieces/m, and the entanglement could not be fully incorporated. During the weaving process, many warp yarn breaks occurred, and the machine stopped every few meters. The quality of weaving is that the filaments are broken and many stripes are found.

[Examples 6 to 8], [Comparative Examples 4 to 5]

A polyester multifilament was obtained in the same manner as in Example 2, except that the discharge amount and the number of holes of the spinneret were adjusted, and the total fineness, single-filament fineness, and yarn count were changed. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 2. Examples 6 to 8 have the same raw material properties, weaving properties, weaving quality, and fabric abrasion resistance as those of Example 2. However, in Comparative Example 4, since the single-filament fineness was a large value of 5.6 dtex, the degree of entanglement was 1.2 pieces/m, and the entanglement could not be sufficiently added. During the weaving process, many warp yarn breaks occurred, and the machine stopped every few meters. The quality of weaving is that the filaments are broken and many stripes are found. In addition, the obtained fabric exhibited a rough hand. In Comparative Example 5, many filaments were broken during spinning, and many filaments were entangled during drawing. Since the monofilament fineness of the obtained polyester multifilament is a small value of 0.8 dtex, the degree of entanglement is a high value of 18.8 pieces/m. The polyester multifilament after the raw yarn abrasion test has many hair balls, and the abrasion resistance is poor. In addition, the obtained polyester multifilament was woven, but the weaving could not be done at all because many warp yarn breakages occurred.

[Comparative Example 6]

A polyester monofilament was obtained in the same manner as in Example 1, except that the number of holes in the spinneret was changed to 1, the discharge amount was changed, and the cross nozzle was not used. The physical properties of the obtained polyester monofilament are shown in Table 2. When the obtained polyester monofilament is used on a water-jet shuttleless loom, many yarn breakages occur in both the warp and weft yarns, resulting in complete inability to weave.

[Example 9]

Spinning was performed in the same manner as in Example 1, except that PET having an intrinsic viscosity of 1.00 was used as the core component, and the spinning speed was set to 600 m/min. After the first coiling, using a known stretching device, between the first and second heat rolls heated to 90°C, and the third heat roll heated to 200°C, two-stage stretching was performed at a stretching ratio of 4.5 times to perform heat setting. Except for the rest, drawing was carried out in the same manner as in Example 1 to obtain a polyester multifilament. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 3. During weaving, the yarn did not break even once in 100 m, showing very good weaving properties. The obtained fabric also has no hairballs and other defects, and is of very good weaving quality. In addition, the abrasion resistance of the fabric was in a good state without generation of hair balls even if the number of abrasions was 6,000 times.

[Example 10]

A polyester multifilament was obtained in the same manner as in Example 9, except that the core component was PET having an intrinsic viscosity of 1.25, the spinning speed was 500 m/min, and the draw ratio was 5.8 times. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 3. Although no hair balls and fibrillation were found in the raw yarn abrasion resistance, there were 8 warp yarn breakages in 100m weaving. In addition, the quality of the obtained fabric was inferior to that of Example 1, in which fuzz was found. The abrasion resistance of the fabric was poorer than that of Example 1 when the number of abrasions was 4,500 times.

[Comparative Example 7]

The single-component system uses PET with an intrinsic viscosity of 0.80, melts it at a temperature of 295°C using an extruder, and then flows into a known single-component spinneret with 5 holes at a polymer temperature of 290°C. The yarn spun out from the spinneret was first wound at a spinning speed of 800 m/min, and then using a known stretching device, between the first heat roll heated to 90°C and the second heat roll heated to 130°C, in accordance with The stretching ratio was 4.3 times, and heat setting was performed by stretching. The obtained drawn yarn was wound at 800 m/min after imparting entanglement at an entanglement pressure of 0.23 MPa using an entanglement nozzle provided between the rearmost roll and the winder. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 3. The abrasion resistance of the raw yarns is likely to generate hairballs, which is inferior to that of Example 1. In 100m weaving, no yarn breakage occurred even once, and the weaving property was very good. However, the obtained fabric had balls, which was inferior to Example 1. In addition, the abrasion resistance of the fabric was significantly inferior to that of Example 1 when the number of abrasions was 500 times, and hair balls appeared.

[Example 11]

As the core component, PET with an intrinsic viscosity of 0.80 was used, and as the sheath component, PET with an intrinsic viscosity of 0.50 was used, and spinning and stretching were performed by a known direct spinning and stretching device. Using an extrusion extruder, after melting at a temperature of 295°C, the polymer temperature is 290°C, and the compound ratio becomes core component: sheath component = 80:20. Pump metering, and flow into the core-sheath type. In a known composite spinneret with 5 holes. The yarn spun out from the spinneret was drawn at a spinning speed of 1,300 m/min, and was directly stretched at a stretching ratio of 3.8 times without being wound up to perform heat-setting. The obtained drawn yarn was wound at 5,000 m/min after imparting entanglement at an entanglement pressure of 0.23 MPa using an entanglement nozzle provided between the final roll and the winder. The yarn breakage was found at the point where the entanglement was imparted, and the result was inferior to that of the second-step method of Example 1. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 3. The single-filament fineness of the stretched entanglement position is 2.4 dtex, which is the same as that of Example 1, but the entanglement degree is a small value of 2.8 pieces/m because the speed when passing through the entanglement nozzle is at a high speed of 5,000 m/min. . Because the degree of entanglement is poorer than that of Example 1, the bundling property is poor, and yarn breakage occurs 7 times during weaving at 100 m. Although the obtained fabric has no hair balls, it is found that the filaments are broken and missing, which is slightly inferior to that of Example 1.

[Comparative Example 8]

A polyester multifilament was obtained in the same manner as in Example 11, except that the interlacing position was set before the spinning draw. The raw yarn physical properties of the obtained polyester multifilament are shown in Table 3. The degree of entanglement is 0.7 pieces/m, and the entanglement cannot be fully incorporated. During the weaving process, many warp yarn breaks occurred, and the machine stopped every few meters. The quality of weaving is that the filaments are broken and many stripes are found.

Claims (2)

A polyester multifilament is a core-sheath type polyester multifilament formed by compounding a high-viscosity polyester of a core component and a low-viscosity polyester of a sheath component; wherein, the intrinsic viscosity difference between the core component and the sheath component is 0.20-1.00, And the total fineness is 4~30dtex, the monofilament fineness is 1.0~5.0dtex, the breaking strength is 5.0~9.0cN/dtex, the breaking elongation is 12~45%, the entanglement degree is 2.0~15.0 pieces/m, and the number of wire counts is 3~15. The polyester multifilament of claim 1, wherein the intrinsic viscosity of the high-viscosity polyester of the core component is 0.70-1.50, and the high-viscosity of the sheath component is 0.40-0.70.