CN111344442A

CN111344442A - High-tenacity fine-denier polyester multifilament yarn

Info

Publication number: CN111344442A
Application number: CN201880072843.9A
Authority: CN
Inventors: 小野勇将; 铃木亮太; 藤森稔
Original assignee: Toray Industries Inc
Current assignee: Toray Industries Inc
Priority date: 2017-11-28
Filing date: 2018-11-09
Publication date: 2020-06-26
Anticipated expiration: 2038-11-09
Also published as: EP3719183A1; TWI758566B; KR102584803B1; CN111344442B; CA3083877A1; US20200318260A1; JP7176413B2; WO2019107111A1; JPWO2019107111A1; TW201925557A; EP3719183A4; KR20200088288A

Abstract

A polyester multifilament, wherein a high-viscosity polyester as a core component and a low-viscosity polyester as a sheath component are combined in a core-sheath type, the intrinsic viscosity difference between the core component and the sheath component is 0.20 to 1.00, the total fineness is 4 to 30dtex, the single-fiber fineness is 1.0 to 5.0dtex, the breaking strength is 5.0 to 9.0cN/dtex, the elongation at break is 12 to 45%, the degree of interlacing is 2.0 to 15.0/m, and the number of filaments is 3 to 15. The present invention provides a fine denier polyester multifilament yarn which can obtain a high density and thin fabric suitable for sportswear and outdoor clothing applications having excellent durability, weaving property and fabric quality, and has high tenacity and excellent abrasion resistance and bundling property.

Description

High-tenacity fine-denier polyester multifilament yarn

Technical Field

The present invention relates to a high-strength fine denier multifilament yarn which can be used for a high-density thin fabric excellent in weaving properties and abrasion resistance, and particularly suitable for clothing applications for sports and outdoors.

Background

High-density woven fabrics using a large amount of synthetic fiber multifilament yarns represented by polyester and nylon have been proposed mainly for applications such as sportswear and airbags, but as the applications are advanced, there is a demand for woven fabrics which are reduced in weight, i.e., thin, and have increased strength. In particular, clothing for sports and outdoor use is required to have improved durability against vigorous exercise and improved abrasion resistance.

Patent document 1 proposes a woven fabric of a single-component polyester multifilament yarn having high strength by setting the intrinsic viscosity of polyethylene terephthalate to 0.70 to 1.20, and having improved weaving properties by containing 0.3 to 0.8 wt% of titanium oxide having a primary particle diameter of 0.1 to 0.6 μm in which 60% or more of the total number of titanium oxide particles is present.

Further, in order to make the thickness thin, the total fineness of the yarn needs to be small, and the number of constituent filaments of the yarn is inevitably small, so that there is a problem that the interlacing (interlacing) is not easily introduced, and the bundling property is poor. If the bundling property is poor, the process passability of the manufacturing process is deteriorated, and the operation at the time of warping/weaving becomes difficult. Further, since the bundling property is insufficient, filament splitting (filament unraveling) occurs, handling of warp yarns during weaving becomes poor, and warp yarn breakage tends to occur. The warp breakage is not only a stop but also a large labor is required to reconnect the warp and reset the warp, which causes a problem that productivity is greatly reduced. In addition, with regard to the quality of the fabric, the filaments split into cord-like defects. Patent document 2 proposes, in order to provide polyamide multifilaments having excellent bundling properties, a method of making the single-filament fineness 0.8dtex or less and easily introducing interlacing, regardless of the total fineness of 6 to 18dtex, so as to provide an interlacing degree of 25 or more.

Patent document 3 proposes a polyester monofilament for screen gauze in which a core-sheath composite yarn is formed as a monofilament, the intrinsic viscosity of the polyester used as a core component is set to 0.70 or more to increase the strength, and the intrinsic viscosity of the polyester used as a sheath component is set to 0.15 to 0.30 lower than that of the core component to suppress scumming (improvement in abrasion resistance).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-074213 (paragraph Nos. [0008] to [0009])

Patent document 2: japanese laid-open patent publication 2009-013511 (paragraph numbers [0008] to [0009])

Patent document 3: japanese patent laid-open No. 2003-213528 (paragraph numbers [0013] to [0014])

Disclosure of Invention

Problems to be solved by the invention

However, the one-component polyester of patent document 1 has a problem in abrasion resistance and cannot meet the durability requirement for advanced applications.

In patent document 2, although weaving properties are improved significantly by increasing the degree of interlacing and improving bundling properties, if the single-yarn fineness is small, there is a problem that yarn breakage and hairiness occur in the warp and weft during weaving.

In patent document 3, it is difficult to produce a high-density woven fabric with monofilaments, and the high monofilament fineness increases the rigidity of the fabric, which is not suitable for clothing applications. Further, when the technique of the core-sheath type composite yarn is applied to a fine denier multifilament, if the single fiber fineness of the core-sheath type composite yarn is small, problems occur such as breakage of the sheath, an excessively thin sheath portion, and insufficient abrasion resistance. On the other hand, if the single-filament fineness is increased, the number of filaments is decreased, so that the entanglement is not easily taken in, the bundling property is deteriorated, and the weavability and the fabric quality are deteriorated.

That is, in the prior art, it has been difficult to obtain polyester multifilaments for thin fabrics having durability, weaving property and fabric quality required for advanced applications, and development of fine denier polyester multifilaments having high strength, excellent abrasion resistance and bundling property has been desired.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a fine denier polyester multifilament yarn having high tenacity, excellent abrasion resistance and excellent bundling property, with the purpose of obtaining a high density and thin fabric suitable for sportswear and outdoor clothing applications having both excellent durability, weaving property and fabric quality.

Means for solving the problems

The present invention can achieve the object by producing the following polyester multifilament yarn.

A polyester multifilament is characterized in that a high-viscosity polyester as a core component and a low-viscosity polyester as a sheath component are compounded in a core-sheath type, the intrinsic viscosity difference between the core component and the sheath component is 0.20 to 1.00, the total fineness is 4 to 30dtex, the single-fiber fineness is 1.0 to 5.0dtex, the breaking strength is 5.0 to 9.0cN/dtex, the elongation at break is 12 to 45%, the degree of interlacing is 2.0 to 15.0 pieces/m, and the number of filaments is 3 to 15.

Further disclosed is a polyester multifilament, which is characterized in that the intrinsic viscosity of a high-viscosity polyester as a core component is 0.70-1.50, and the high viscosity of a sheath component is 0.40-0.70.

ADVANTAGEOUS EFFECTS OF INVENTION

The polyester multifilament yarn of the present invention has high tenacity and excellent abrasion resistance and bundling property, and can give a high-density thin fabric suitable for sportswear and outdoor clothing applications, which has excellent durability, weaving property and fabric quality.

Detailed Description

The polyester multifilament yarn of the present invention will be explained.

The polyester multifilament yarn of the present invention is formed of a core-sheath type composite fiber in which a core component is covered with a sheath component in a cross section of a monofilament and the core component is arranged so as not to be exposed to the surface. In general, it is known that in order to increase the strength of polyester fibers, the polyester fibers may be drawn at a high draw ratio in the process of producing raw fibers, and subjected to high orientation and high crystallization, but in the weaving of a high-density thin fabric, in order to achieve a high-density weaving with a small total fineness, the warp yarns are subjected to a large amount of friction by a reed with a strong load, and thus have a problem of generating hairiness due to the breakage of the monofilament. In addition, the durability of the woven fabric used for advanced applications against friction is required, and it is an important problem to improve the abrasion resistance of the yarn.

In the polyester multifilament yarn of the present invention, it is necessary to lower the intrinsic viscosity of the polyester used as the sheath component than that of the polyester used as the core component from the viewpoint of obtaining excellent abrasion resistance, and the difference is preferably 0.20 to 1.00. By setting the difference in intrinsic viscosity to 0.20 or more, the degree of orientation and crystallinity of the fiber surface of the polyester multifilament, which is the polyester of the sheath component, can be suppressed, and good abrasion resistance can be obtained. Further, since the sheath component bears the shear stress of the inner wall surface of the die discharge hole in the melt spinning, the shear force applied to the core component is small, the degree of orientation of the molecular chains of the core component is low, and the core component is spun in a uniform state, and therefore the strength of the finally obtained polyester multifilament yarn is improved. On the other hand, in order for the polyester multifilament yarn to have high strength, the orientation of the sheath component also needs to be moderate, and therefore if the difference in intrinsic viscosity is more than 1.00, satisfactory strand strength is not obtained. More preferably, the difference in intrinsic viscosity of the polyesters is 0.30 to 0.70.

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

On the other hand, the low-viscosity polyester as the sheath component has an intrinsic viscosity of 0.40 or more, and thus stable yarn formability can be obtained. More preferably, the intrinsic viscosity is 0.50 or more. Further, in order to obtain good abrasion resistance, it is preferably 0.70 or less.

As the polyester of the polyester multifilament yarn of the present invention, a polyester containing polyethylene terephthalate (hereinafter, referred to as PET) as a main component can be used.

As the PET used in the present invention, a polyester having terephthalic acid as a main acid component and ethylene glycol as a main glycol component, and having 90 mol% or more of a repeating unit of ethylene terephthalate can be used. However, other copolymerizable components capable of forming an ester bond may be contained in a proportion of less than 10 mol%. Examples of such a copolymerization component include, but are not limited to, dicarboxylic acids such as an acid component, a bifunctional aromatic carboxylic acid such as isophthalic acid, phthalic acid, dibromoterephthalic acid, naphthalenedicarboxylic acid, or o-ethoxybenzoic acid, a bifunctional aliphatic carboxylic acid such as sebacic acid, oxalic acid, adipic acid, or a dimer acid, and cyclohexanedicarboxylic acid, and examples of a diol component include, but are not limited to, polyoxyalkylene glycols such as ethylene glycol, diethylene glycol, propylene glycol, butanediol, neopentyl glycol, bisphenol a, cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol.

Further, titanium dioxide as a matting agent, silica as a lubricant, fine particles of alumina, a hindered phenol derivative as an antioxidant, further a flame retardant, an antistatic agent, an ultraviolet absorber, a coloring pigment, and the like may be added to PET as needed.

Further, since PET as a core component mainly contributes to the strength of the polyester multifilament yarn, it is preferable that an additive of inorganic particles represented by titanium oxide added to the polyester fiber is 0.5 wt% or less in general. On the other hand, since PET as a sheath component is mainly responsible for the abrasion resistance of the polyester multifilament yarn, it is preferable to add inorganic particles such as titanium oxide in an amount of about 0.1 wt% to about 0.5 wt%.

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

As described above, the polyester multifilament yarn of the present invention is a core-sheath composite polyester multifilament yarn in which a core component is covered with a sheath component in a cross section of a monofilament and the core component is arranged so as not to be exposed to the surface. The core-sheath type is not necessarily arranged concentrically as long as the core component is completely covered with the sheath component. The cross-sectional shape includes several shapes such as a circle, a flat shape, a triangle, a quadrangle, and a pentagon, but a circular cross-section is preferable for densification of the woven fabric in terms of easy achievement of stable yarn-making property and high-order processability.

In the present invention, since both the core component and the sheath component are polyester, peeling at the composite interface, which is often caused in the polyester/nylon composite yarn, is less likely to occur. However, from the viewpoint of combining the effect of improving the abrasion resistance by the sheath component and the effect of increasing the strength by the core component, the core component: the compounding ratio of the sheath component is preferably 60: 40-95: 5, and more preferably a composite ratio of 70: 30-90: 10, in the above range.

Here, the so-called composite ratio defined in the present invention is a ratio of cross-sectional areas of 2 polyesters constituting a monofilament in a cross-sectional photograph of the monofilament of the polyester multifilament.

The polyester multifilament of the present invention is required to have a total fineness of 4 to 30 dtex. The fiber can be stably made and woven by 4dtex or more, and the fiber can be made into a target high-density thin fabric by 30dtex or less. The preferable range of the total fineness is 8 to 25 dtex.

In addition, the polyester multifilament of the present invention requires a single fiber fineness of 1.0 to 5.0 dtex. When the single-fiber fineness is less than 1.0dtex, it becomes difficult to form a desired core-sheath cross section, and thus, the sheath tends to be broken or the thickness of the sheath component tends to be thin, thereby making the abrasion resistance insufficient. Further, the process passability such as yarn formability and weaving properties tends to be deteriorated. Further, by setting the yarn to 5.0dtex or less, the yarn is easily interlaced, the bundling property is improved, and the effect of improving the process passability and the weaving property can be obtained. In addition, the obtained fabric has compactness and good hand feeling without being too hard. The preferable range of the single fiber fineness is 1.5 to 3.0 dtex. In order to achieve the above single-filament fineness, the discharge amount and spinneret may be appropriately changed in the method for producing the polyester multifilament.

Further, the polyester multifilament yarn of the present invention requires a number of filaments of 3 to 15. By making the number of filaments 3 or more, interlacing can be easily introduced. Further, if the number of filaments is increased, the contact with a reed, a guide, or the like at the time of weaving can be dispersed in each monofilament, so that the load of friction received by the monofilament can be reduced, and the abrasion resistance of the yarn and the durability of the fabric can be greatly improved. The upper limit of the number of filaments is 15 or less, although it depends on the total fineness and the single-yarn fineness.

The polyester multifilament yarn of the present invention is required to have improved bundling property in order to obtain excellent weaving property and fabric quality. When the bundling property is insufficient, filament splitting (filament unraveling) occurs, handling of warp yarns during weaving becomes poor, and warp yarn breakage tends to occur. In addition, with regard to the quality of the fabric, filament splitting also becomes a cord-like fabric defect.

The polyester multifilament yarn of the present invention is required to have a degree of interlacing of 2.0 to 15.0 pieces/m per 1m of interlacing number. If the degree of interlacing is less than 2.0 pieces/m, the weavability such as breakage of warp tends to be deteriorated. The fabric obtained had streaky fabric defects caused by the split filaments, and the fabric quality tended to be poor. By setting the degree of interlacing to 2.0 pieces/m or more, excellent weaving properties and fabric quality can be obtained. On the other hand, if the degree of interlacing is too high, the binding points become too large, and the effect of dispersing contact with a reed, a guide, or the like at the time of weaving to each monofilament and thereby reducing the load of friction received by the monofilament is reduced, and abrasion resistance of the yarn and durability of the woven fabric tend to be poor, so that the degree of interlacing needs to be 15.0 pieces/m or less. Further, in order to increase the degree of interlacing, the load in the interlacing step may be increased, and yarn breakage may occur frequently to deteriorate productivity. More preferably, the degree of interlacing is in the range of 4.0 to 10.0 pieces/m.

The polyester multifilament yarn of the present invention has a breaking strength of 5.0cN/dtex or more, and thus can provide sufficient mechanical properties even when made into a thin fabric. More preferably 6.0cN/dtex or more. Further, from the viewpoint of abrasion resistance, it is necessary to suppress orientation and crystallinity, and therefore, it is 9.0cN/dtex or less, more preferably 8.0cN/dtex or less.

The polyester multifilament yarn of the present invention has an elongation at break of 12% or more, and thus can suppress yarn breakage and generation of hairiness during weaving, and has excellent workability, and a breaking strength of 45% or less, and thus can achieve a desired breaking strength. More preferably, the elongation at break is in the range of 17 to 35%.

Further, in the polyester multifilament yarn of the present invention, the strength at 5% elongation (5% Mo) and the strength at 10% elongation (10% Mo) are preferably 3.5cN/dtex or more, more preferably 3.8cN/dtex or more, in view of dimensional stability of the woven fabric. The 10% Mo is preferably 4.0cN/dtex or more, more preferably 4.5cN/dtex or more. In addition, from the viewpoint of wear resistance, since orientation and crystallinity are suppressed, 5% Mo is preferably 6.0cN/dtex or less, more preferably 5.0cN/dtex or less. The 10% Mo is preferably 8.0cN/dtex or less, more preferably 7.0cN/dtex or less.

Next, a preferred method for producing the polyester multifilament yarn of the present invention will be described.

The process for producing a polyester multifilament yarn of the present invention is characterized in that the position where the yarn is interlaced is after drawing. When the interlacing is performed at the stage of undrawn yarn, it is difficult to introduce interlacing in the range of the total fineness, the single-yarn fineness, and the number of filaments of the multifilament of the present invention. Therefore, by interlacing the drawn yarn at a stage when the single-yarn fineness is small, a target interlacing degree can be achieved.

Further, the method of interlacing the polyester multifilament yarn of the present invention may use known interlacing jet nozzles. The pressure for interlacing is preferably 0.10 to 0.40 MPa. If the pressure is less than 0.10MPa, sufficient interlacing is difficult to be introduced, and if the pressure exceeds 0.40MPa, yarn breakage often occurs, and productivity is deteriorated. More preferably 0.15 to 0.30 MPa.

The method for spinning the polyester multifilament yarn of the present invention is not particularly limited, and a known technique can be used. For example, a high-viscosity PET as a core component and a low-viscosity PET as a sheath component are melt-extruded separately, fed to a predetermined composite module using a composite spinning machine, both polymers are filtered in the module, composite spun by being bonded to a core-sheath type through a spinneret, and a yarn discharged from the spinneret is drawn to obtain an undrawn yarn. The undrawn yarn may be temporarily wound and then drawn by a drawing machine, or may be drawn without being temporarily wound, but in the below-described interlacing, the interlacing is not easily introduced if the yarn speed is high, and therefore, the two-step method is more preferable.

The method for drawing the polyester multifilament yarn of the present invention is not particularly limited, and a known technique can be used. For example, it can be appropriately selected from the following methods: a method of performing 1-stage heating stretching heat between a 1 st hot roll and a 2 nd hot roll; a method of performing 1-stage heating and stretching with a 1 st hot roll and a non-heating roll and an electric heating plate between the rolls; and a method of performing the 1 st stage heating and stretching between the 1 st hot roll and the 2 nd hot roll, and performing the 2 nd stage heating and stretching between the 2 nd hot roll and the 3 rd hot roll. In particular, in order to achieve high strength, it is necessary to draw undrawn yarn at a high draw ratio, but if the drawing is performed in 1-stage, the drawing tension increases, and therefore problems such as yarn unevenness increases and yarn breakage often occur, and therefore, drawing in 2-stage or more is preferable.

When the temperature for drawing the polyester multifilament yarn of the present invention is 1-stage drawing, it is preferable that the 1 st hot roll is usually set to a glass transition temperature of +10 to 30 ℃ of the high-viscosity PET as the core component, and the 2 nd hot roll or the electric heating plate is set to a temperature in the range of 130 to 230 ℃. By setting the temperature to 130 ℃ or higher, the orientation is controlled, the crystallization of the fiber is promoted, and the strength is increased. On the other hand, at 230 ℃ or lower, melt adhesion at the hot roll or the electric hot plate is prevented, and the filamentation is improved. In the case of the multistage drawing, it is preferable that the 1 st hot roll is set to have a glass transition temperature of the high-viscosity PET as a core component of +10 to 30 ℃, the temperature is gradually increased after the 2 nd hot roll, and the final hot roll is set to have a temperature in the range of 100 to 230 ℃.

Further, the total draw ratio of the polyester multifilament yarn of the present invention is preferably 3.0 to 7.0 times. More preferably 3.5 to 6.0 times, and still more preferably 3.8 to 5.0 times.

Examples

The polyester multifilament yarn of the present invention will be specifically described below with reference to examples. The measured values of the examples were measured by the following methods.

(1) Intrinsic Viscosity (IV)

About the general regulation of Byt η/η₀η r, 0.8g of a sample polymer was dissolved in 10mL of o-chlorophenol (hereinafter abbreviated as OCP) having a purity of 98% or more at a temperature of 25 ℃ to prepare a polymer solution, and the Ostwald viscosity was used at a temperature of 25 ℃The Intrinsic Viscosity (IV) was calculated from η r by the following equation.

ηr＝η/η₀＝(t×d)/(t₀×d₀)

Intrinsic Viscosity (IV) 0.0242 η r +0.2634

η viscosity of Polymer solution η₀: viscosity t of OCP: drop time (sec) d of the solution: density of solution (g/cm)³)t₀: falling time (second) d of OCP₀: density (g/cm) of OCP³)。

(2) Total denier (dtex)

The yarn was twisted to 500m, and the fineness was determined by multiplying the mass (g) of the twisted yarn by 20.

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

Measured according to JIS L1013(1999) using テンシロン UCT-100 manufactured by オリエンテック.

(4) Degree of interleaving (pieces/m)

The yarn was floated on water, and the number of collecting points per 1m was measured to obtain the degree of interlacing. The measurement was performed 10 times, and the average value was calculated.

(5) Abrasion resistance of raw filament

A yarn tension of 0.9g/dtex was applied to the yarn, a flat surface portion of a reed (material: SK material, width 7mm ×, length 50mm ×, thickness 50 μm) was pressed so as to have a contact angle of 20 DEG, and the reed was reciprocated at a stroke length of 30mm and a speed of 670 times/minute for 10 minutes.

(6) Evaluation of weaving Property and weaving quality

By using a water jet loom, the fiber density is adjusted to 30-35 g/m according to the total fineness of the used filaments²The pattern of (1) is woven. Regarding the weaving properties, the number of stops per 100m due to yarn breakage or the like was evaluated as S less than 3 times, a number of times of 3 or more and less than 10 times was evaluated as a, and a number of times of 10 or more was evaluated as C. Relating to weavingThe quality was evaluated as S, A in terms of less than 3 defects per 100m, C in terms of not less than 3 defects such as hairiness and filament breakage, and C in terms of not less than 10 defects.

(7) Abrasion resistance of fabric

The fabric abrasion resistance was measured in accordance with JIS L1096(2010) and in accordance with method E (martindale). The test conditions were carried out using a standard rubbing cloth made of polyester, and the pressing load was 9 kPa. The number of wear times until generation of the hairiness was determined to be 5,000 or more times as A, 3,000 or more times and less than 5,000 times as B, and less than 3,000 times as C.

With respect to the production methods of examples and comparative examples, polyester filaments were obtained according to a known technique under the production conditions shown in tables 1 to 3.

[ example 1]

PET having an intrinsic viscosity of 0.80 as a core component and PET having an intrinsic viscosity of 0.50 as a sheath component were melted at a temperature of 295 ℃ using an extrusion extruder, and then mixed at a polymer temperature of 290 ℃ to obtain core components: sheath composition 80: the pump was metered in such a manner as 20 to flow into a known composite die having 5 holes such as a core-sheath die. After the filaments discharged from the die were once wound at a spinning speed of 1,200 m/min, they were stretched at a draw ratio of 4.2 times between a 1 st hot roll heated to 90 ℃ and a 2 nd hot roll heated to 130 ℃ by a known stretching apparatus, and heat-set. The drawn yarn thus obtained was entangled at an interlacing pressure of 0.23MPa by an interlacing nozzle provided between a final roll and a winder, and then wound at 800 m/min. The spinnability was not particularly problematic, and polyester multifilament having a total fineness of 12.0dtex, a single-filament fineness of 2.4dtex, a breaking strength of 6.5cN/dtex, an elongation at break of 17.7%, and a degree of interlacing of 5.8 pieces/m was obtained. The polyester multifilament yarn has excellent abrasion resistance of the yarn. The physical properties of the other filaments are shown in Table 1.

Using the polyester multifilament yarn, the basis weight was 30g/m by a water jet loom²The weaving is performed in the manner of (1). The yarn was not broken 1 time at 100m weaving, and the weaving property was very good. The obtained fabric had no defects such as hairiness and was a very good woven fabricAnd (4) quality. Further, the abrasion resistance of the fabric was good, since no hairiness occurred even when the number of abrasion was 6,000.

[ examples 2 to 3]

Polyester multifilament yarn was obtained in the same manner as in example 1, except that the draw ratio was 3.9 times and 3.6 times, respectively. The physical properties of the obtained polyester multifilament yarn were as shown in table 1. In both examples 2 and 3, the broken line was not present in the weaving of 100m for 1 time, and the weaving property was very good. The obtained fabric had no defects such as hairiness and was very excellent in weaving quality. Further, the abrasion resistance of the fabric was good, since no hairiness occurred even when the number of abrasion was 6,000.

Examples 4 to 5 and comparative examples 1 to 2

Polyester multifilament yarn was obtained in the same manner as in example 1, except that the interlacing pressure was changed to 0.08 to 0.42 MPa. The physical properties of the obtained polyester multifilament yarn were as shown in table 1. In example 4, the degree of entanglement was 9.9 pieces/m, and good results were obtained in the same manner as in example 1 in the yarn abrasion resistance, weaving property, weaving quality, and fabric abrasion resistance. In example 5, the interlacing degree was 4.2 pieces/m, and the bundling was slightly inferior to that in example 1, so that the yarn breakage at 100m was 3 times, but the weavability was good. The obtained fabric had no hairiness, but the defect of filament splitting was observed, which was slightly inferior to that of example 1. In comparative example 1, the interlace pressure was high, and the yarn shaking (rock れ) at the interlace position was large, resulting in yarn breakage. The degree of entanglement was as high as 15.3 pieces/m, and hairiness was liable to occur with respect to abrasion resistance of the yarn, which was inferior to example 1. The yarn breakage in weaving was 6 times, and the weaving quality had hairiness, which was inferior to example 1. Further, with respect to the abrasion resistance of the fabric, hairiness was generated even when the number of abrasion was 3,500. In comparative example 2, the interleave pressure was low, and the interleave degree became 1.7 pieces/m, so that interleave could not be sufficiently introduced. In weaving, warp yarn breakage often occurs, and stops occur every m. Regarding the weaving quality, the filaments were split more, and a large number of streak-like defects were observed.

[ Table 1]

Comparative example 3

Polyester multifilament yarn was obtained in the same manner as in example 1, except that the position where the yarn was interlaced was set before winding of the spun yarn. The physical properties of the obtained polyester multifilament yarn were as shown in table 2. The degree of interleaving becomes 0.8/m, and interleaving cannot be sufficiently introduced. In weaving, warp yarn breakage often occurs, and stops occur every m. Regarding the weaving quality, the filaments were split more, and a large number of streak-like defects were observed.

Examples 6 to 8 and comparative examples 4 to 5

Polyester multifilament yarn was obtained in the same manner as in example 2, except that the discharge amount and the number of holes of the die were adjusted and the total fineness, the single-filament fineness, and the number of filaments were changed. The physical properties of the obtained polyester multifilament yarn were as shown in table 2. In examples 6 to 8, the properties of the yarn, the weaving properties, the weaving quality, and the abrasion resistance of the fabric were equivalent to those of example 2. In comparative example 4, since the monofilament fineness was as large as 5.6dtex, the interlacing degree became 1.2 pieces/m, and the interlacing could not be sufficiently introduced. In weaving, warp yarn breakage often occurs, and stops occur every m. Regarding the weaving quality, the filaments were split more, and a large number of streak-like defects were observed. The resulting fabric also had a hard-bang feel. In comparative example 5, the filaments were broken during spinning, and the filaments were often entangled even when stretched. The obtained polyester multifilament has a single filament fineness as small as 0.8dtex, so that the interweaving degree is as high as 18.8 pieces/m. The polyester multifilament after the strand abrasion test generates a large amount of hairiness and has poor abrasion resistance. In addition, although the polyester multifilament yarn obtained was woven, warp yarn breakage occurred frequently and was completely impossible to weave.

Comparative example 6

Polyester monofilaments were obtained in the same manner as in example 1, except that the discharge amount was changed so that the number of holes of the die was 1 and that the interlacing jet was not used. The physical properties of the obtained polyester monofilament were as shown in table 2. The obtained polyester monofilament is always broken in warp and weft in a water jet loom, and cannot be woven at all.

[ Table 2]

[ 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 temporary winding, the polyester multifilament yarn was drawn in the same manner as in example 1 except that the yarn was heat-set by 2-stage drawing at a draw ratio of 4.5 times between the 1 st and 2 nd hot rolls heated to 90 ℃ and the 3 rd hot roll heated to 200 ℃ using a known drawing apparatus. The physical properties of the obtained polyester multifilament yarn were as shown in table 3. The yarn was broken 1 time at 100m during weaving, and the weaving property was very good. The obtained fabric had no defects such as hairiness and was very excellent in weaving quality. Further, the abrasion resistance of the fabric was good, since no hairiness occurred even when the number of abrasion was 6,000.

[ example 10]

Polyester multifilament yarn was obtained in the same manner as in example 9, except that PET having an intrinsic viscosity of 1.25 was used as the core component, and the spinning speed was set to 500 m/min and the draw ratio was set to 5.8 times. The physical properties of the obtained polyester multifilament yarn were as shown in table 3. For the strand abrasion resistance, hairiness and fibrillation were not observed, but in the weaving of 100m, the number of warp yarn breaks was changed to 8. Further, with respect to the quality of the obtained fabric, hairiness was observed, which was inferior to that of example 1. The abrasion resistance of the fabric was inferior to that of example 1 in that hairiness was generated even when the number of abrasion was 4,500.

Comparative example 7

PET having an intrinsic viscosity of 0.80 was used as a single component, and the mixture was melted at 295 ℃ using an extrusion extruder, and then flowed into a known single component die having 5 holes at 290 ℃ which is the polymer temperature. After the filaments discharged from the die were once wound at a spinning speed of 800 m/min, they were stretched at a draw ratio of 4.3 times between the 1 st hot roll heated to 90 ℃ and the 2 nd hot roll heated to 130 ℃ by a known stretching apparatus, and heat-set. The drawn yarn thus obtained was entangled at an interlacing pressure of 0.23MPa by an interlacing nozzle provided between a final roll and a winder, and then wound at 800 m/min. The physical properties of the obtained polyester multifilament yarn were as shown in table 3. The abrasion resistance of the filament was inferior to that of example 1, since hairiness was likely to occur. The yarn was not broken 1 time at 100m weaving, and the weaving property was very good, but the obtained fabric had hairiness and was inferior to example 1. Further, regarding the abrasion resistance of the fabric, generation of hairiness was observed when the number of abrasion was 500, and the abrasion resistance was remarkably inferior to that of example 1.

[ example 11]

PET having an intrinsic viscosity of 0.80 was used as the core component, PET having an intrinsic viscosity of 0.50 was used as the sheath component, and spinning/drawing was performed by a known direct spinning drawing apparatus. Using an extrusion type extruder, melting at 295 ℃, and forming core components at 290 ℃ in a compounding ratio at a polymer temperature: sheath composition 80: the pump was metered to flow into a known composite die having 5 holes, such as a core-sheath die, as in the case of the 20-stage pump. The yarn discharged from the die was drawn at a spinning speed of 1,300 m/min, and drawn at a draw ratio of 3.8 times without being temporarily wound, and heat-set. The drawn yarn thus obtained was entangled at an interlacing pressure of 0.23MPa by an interlacing nozzle provided between a final roll and a winder, and then wound at 5,000 m/min. Regarding the yarn formability, yarn breakage was observed in the interlaced portion, which was inferior to the two-step method as in example 1. The physical properties of the obtained polyester multifilament yarn were as shown in table 3. The filament fineness at the position of the drawing where the yarn was interlaced was 2.4dtex, which is equivalent to example 1, but the yarn passed through the interlacing jet was made to be as high as 5,000 m/min, and the interlacing degree was as small as 2.8 pieces/m. Since the degree of interlacing was inferior to that in example 1, the bundling property was inferior, and the number of weaving breakage lines at 100m was 7. The obtained fabric had no hairiness, but the defect of filament splitting was observed, which was slightly inferior to that of example 1.

Comparative example 8

Polyester multifilament yarn was obtained in the same manner as in example 11, except that the position where the yarn was interlaced was set before drawing the spun yarn. The physical properties of the obtained polyester multifilament yarn were as shown in table 3. The degree of interleaving becomes 0.7/m, and interleaving cannot be sufficiently introduced. In weaving, warp yarn breakage often occurs, and stops occur every m. Regarding the weaving quality, the filaments were split more, and a large number of streak-like defects were observed.

[ Table 3]

Claims

1. A polyester multifilament, wherein a high viscosity polyester as a core component and a low viscosity polyester as a sheath component are compounded in a core-sheath type, the intrinsic viscosity difference between the core component and the sheath component is 0.20 to 1.00, the total fineness of the polyester multifilament is 4 to 30dtex, the single-fiber fineness is 1.0 to 5.0dtex, the breaking strength is 5.0 to 9.0cN/dtex, the elongation at break is 12 to 45%, the interweaving degree is 2.0 to 15.0/m, and the number of filaments is 3 to 15.

2. The polyester multifilament yarn according to claim 1, wherein the high-viscosity polyester as a core component has an intrinsic viscosity of 0.70 to 1.50 and the high-viscosity polyester as a sheath component has a high viscosity of 0.40 to 0.70.