WO2016052269A1

WO2016052269A1 - Polyester filament package

Info

Publication number: WO2016052269A1
Application number: PCT/JP2015/076714
Authority: WO
Inventors: 西村將生; 内山翔一朗; 吉宮隆之; 佐藤瑛久
Original assignee: 東レ株式会社
Priority date: 2014-09-30
Filing date: 2015-09-18
Publication date: 2016-04-07
Also published as: JP2016069789A; TW201619461A

Abstract

The present invention provides a polyester filament package which has few defects such as sink marks and has a high fineness, high strength, and excellent dimensional stability. This polyester filament package is a package obtained by winding filaments of a polyester comprising a polyene terephthalate as the main constituent component. In the polyester filament package, the filaments wound on a mandrel having a hardness of 200 kgf/100 mm or greater and an outer diameter of 60 mmφ or larger have a 5% modulus of 2.0 cN/dtex or higher, and the filaments, in an examination for wet-heat shrinkage stress in the longitudinal direction, have a peak cycle of 150 m or less.

Description

Polyester filament package

The present invention relates to a polyester filament package.

More specifically, the present invention relates to a high-quality polyester filament package that has fineness, high strength, excellent uniformity, excellent suppression of sink marks, etc., and can be suitably used for screens for high-precision printing.

Conventionally, mesh fabrics made of natural fibers such as silk and inorganic fibers such as stainless steel have been widely used as screen rivets. In recent years, synthetic fiber meshes excellent in flexibility, durability, and cost competitiveness have been used favorably. Among them, monofilaments made of polyester are widely used because they are suitable for screen use such as excellent dimensional stability.

Screen printing is used, for example, for application of electrode paste to a front electrode substrate and a rear electrode substrate constituting a plasma display (hereinafter referred to as PDP), high-precision printing of a design object by computer graphics, electronic circuit printing, and the like. In such applications, high printing accuracy in a wide range is required. Therefore, it is important that the screen ridges used have dimensional stability that can withstand high tension folds, and have a uniform and high mesh number. Furthermore, with the increase in the screen size of PDPs and the like, the screen screen to be used is required to have a high quality with no defects over a wide range of several meters or more.

It is essential that the polyester monofilament used for realizing the above-mentioned required performance has a fineness and high strength. In order to increase the strength and modulus of the polyester fiber, it is necessary to draw the polyester fiber at a high magnification in the production process of the raw yarn to achieve high orientation and high crystallization.
However, when high-strength stretching is performed, mechanical distortion, that is, stress is generated and accumulated in the fiber due to a sudden structural change. This mechanical distortion decreases with time. This is called stress relaxation. When a fiber obtained by high-stretch drawing is wound as a package, this stress relaxation does not progress uniformly throughout the package. A portion where stress relaxation has not progressed appears as a streak-like gloss abnormality. This gloss abnormality is called sink.

On the other hand, there are filters that require a filtration function as the main application other than the screen for monofilaments. For example, a filter for engine oil and a filter that is indispensable for cleaning water. Moreover, the use in clothing is mentioned as a use in a multifilament. Of course, other uses can also be applied without problems.

Currently, screen weaves are used for printing after weaving, applying an emulsion, exposing and curing the emulsion, and copying the electronic circuit. For this reason, when the emulsion sensitizes and hardens, if the halation of the irradiation light occurs, the printing accuracy decreases. In order to prevent a decrease in printing accuracy, the occurrence of halation is reduced by dyeing with a light-colored dye after weaving. However, the above-mentioned sink part remains as a streaky abnormal part even after staining. For this reason, the sunken portion deteriorates the quality of the screen wrinkles, causes a difference in gloss from the normal portion, and causes a photosensitive spot or the like when the emulsion is exposed. As a result, the printing accuracy is lowered, resulting in a low-quality screen wrinkle that is not suitable for high-precision printing by high meshing.

Generally speaking, the higher the precision of screen printing, the greater the number of screen meshes used. For this reason, monofilaments with fineness and high strength must be used for the screen. In particular, in a # 400 or higher high mesh screen wrinkle, it is important that the fineness and strength of all the fibers used, as well as the structure of the fibers are uniform, in addition to the absence of defects due to sink marks. This is because, as the printing accuracy increases, the tension of the tension increases, so that it is necessary to make the physical properties of all the fibers forming the screen defects constant. And by making the physical properties of all the fibers constant, the openings of the screen are made uniform and high-precision printing is possible for the first time.

It is known that the sink marks of the package are more likely to occur as the stress relaxation becomes non-uniform, and the degree thereof is stronger. For this reason, it is very important to improve the uniformity of stress relaxation in the longitudinal direction of the fiber, or to reduce the stress relaxation itself to a level where there is no actual harm.
Various techniques have been proposed in response to such demands. For example, the patent document relating to the composite monofilament discloses a technique for obtaining a high-quality screen wrinkle with fineness, high strength and high modulus (Patent Documents 1 and 2). These documents disclose controlling the heat-and-heat shrinkage stress difference in the longitudinal direction of the fiber with respect to pirn sinks. Patent Document 3 discloses a technique for obtaining a high-strength, high-modulus polyester by winding with a taper angle on a bobbin by a spindle winding method using a direct spinning drawing method (Patent Document 3). Patent Document 4 discloses a technique in which fiber crystallization is relaxed by multi-stage stretching of a polyester unstretched yarn, the generation of internal fiber strain is controlled, and panic marks are suppressed (Patent Document 4). Patent Document 5 focuses on a polyester monofilament package, defines drum hardness, innermost layer winding width, winding thickness, and outermost layer twill angle, and does not generate excellent unwinding properties, thread drop, tarmi, and thread slippage. A technique for obtaining a package having good foam stability is disclosed (Patent Document 5).

As described above, many inventions have been proposed that aim to increase the strength, quality, and sophistication of polyester monofilaments. However, in order to stably obtain a high-mesh screen wrinkle capable of high-precision printing, it has excellent control and uniformity of the fiber surface and internal fiber structure, and high-quality fineness that does not cause quality problems such as sink marks and halation. A strength filament has not yet been obtained. Therefore, there has been a long-awaited demand for polyester tellur filaments that can be suitably used for screens for high-precision printing and for uses other than screens.

International Publication No. 2010/090108 JP 2013-249143 A JP 2004-225224 A JP 2001-355123 A Japanese Patent Laid-Open No. 08-199424

In the present invention, the problem described in each of the above-mentioned patent documents, that is, the methods described in

Patent Documents

1 and 2, cannot be taken large because the winding method is a spindle method and bobbin winding. For this reason, it was found that the tension fluctuation was large and stable winding was difficult, and the fine dispersion of the end face portion was insufficient even with respect to sink marks. Since the technique described in Patent Document 3 is also a bobbin-wrapped package, there is no fine dispersion of sink marks generated due to a difference in stress relaxation between the straight portion and the end surface. For this reason, this technology has not been sufficient in terms of quality. The technique described in Patent Document 4 is based on a so-called two-step method in which each polyester is melt-spun at a temperature equal to or higher than the melting point, wound once at a low speed, and then heated and stretched. And it is the method of winding up in the shape of a pan using the draw twister which is a well-known drawing machine. In this draw twister, the winding tension increases due to the ironing of the traveler, and the degree of relaxation of the residual shrinkage stress of the yarn differs between the package end and the package center. For this reason, it is not possible to avoid panic marks (horizontal sink-like stripes having a gloss difference that appear in the horizontal direction with periodicity). The technique described in Patent Document 5 defines the twill angle and the innermost layer winding width. However, the main objectives were to prevent the package from dropping off and to improve the unwinding property, and there were unresolved studies on the improvement of sink marks, the internal structure and physical properties of the fibers.
The problem of the present invention is to solve such conventional problems, fineness, high strength, excellent dimensional stability, and less occurrence of defects such as sink and halation, as well as uses other than screen wrinkles, It is to provide a polyester filament package that is also suitable for high performance screens.

In order to solve the above problems, the present invention has the following configuration.
(1) The peak period of wet heat shrinkage stress in the longitudinal direction of the fiber when the 5% modulus of the yarn wound on the winding tube having a hardness of 200 kgf / 100 mm or more and an outer diameter of 60 mmΦ or more is 2.0 cN / dtex or more A polyester filament package having a length of 150 m or less.
(2) The polyester filament package according to (1), wherein the wound yarn has a single yarn fineness of 3 to 20 dtex.
(3) The polyester filament package according to (1) or (2), wherein the wound yarn has a breaking strength of 5.0 to 9.0 cN / dtex.
(4) The polyester filament package according to any one of (1) to (3), wherein a wet heat shrinkage difference in the longitudinal direction of the wound yarn is 3.0 cN / dtex or less.

The polyester filament package of the present invention has a high modulus and has excellent dimensional stability when used as a screen wrinkle, and is an excellent wrinkle free from package sink and halation. Needless to say, polyester filaments suitable for high performance screens with particularly demanding performance can be used for other applications such as filters and clothing.

The screen cage using the polyester filament package of the present invention is preferably used for applications that require higher mesh and more stringent quality requirements. For example, graphic design such as a compact disc label, high-precision printing such as an electronic circuit board, and the like.

It is the schematic of the spinning | drawing extending | stretching installation which shows one Embodiment of this invention. It is the schematic of the spinning equipment in a 2 process method. It is the schematic of the extending | stretching installation in a 2 process method.

Hereinafter, the present invention will be described in detail.
As the polyester of the polyester filament package of the present invention, a polyester mainly composed of polyethylene terephthalate (hereinafter referred to as PET) is used.

As PET used in the present invention, terephthalic acid is the main acid component, and ethylene glycol is the main glycol component. In this polyester, 90 mol% or more is composed of repeating units of ethylene terephthalate. The PET used in the present invention can contain a copolymer component capable of forming other ester bonds at a ratio of 10 mol% or less.
Examples of the copolymer component include, as acid components, bifunctional aromatic carboxylic acids such as isophthalic acid, phthalic acid, dibromoterephthalic acid, naphthalenedicarboxylic acid, orthoethoxybenzoic acid, sebacic acid, oxalic acid, and adipic acid. , Difunctional aliphatic carboxylic acids such as dimer acid, and dicarboxylic acids such as cyclohexanedicarboxylic acid. Examples of the glycol component include ethylene glycol, diethylene glycol, propanediol, butanediol, neopentyl glycol, bisphenol A, and polyoxyalkylene glycols such as cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol.

If necessary, the polyester filament of the present invention may contain titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, and a hindered phenol derivative as an antioxidant. Furthermore, a flame retardant, an antistatic agent, an ultraviolet absorber, a color pigment, and the like can be added to the polyester filament.

The polyester filament of the present invention can be a composite fiber or a single fiber. In the case of a composite fiber, a core-sheath type composite polyester filament formed by combining polyethylene terephthalates having different intrinsic viscosities (hereinafter referred to as IV (Inherent Viscosity)) into a core-sheath type is preferable. This is because fiber properties and weaving properties can be easily achieved. The core-sheath type refers to a fiber cross-sectional shape in which one polyester is completely covered with the other polyester. The polyester on the fiber surface is the sheath component, and the polyester inside the fiber covered with the sheath component is the core component. Regarding the cross-sectional shape, if necessary, the irregular cross-section and the core component may be eccentric. The core component and the sheath component are preferably arranged concentrically and have a round cross section for stable spinning and high-order processability.

The cross-sectional shape when the polyester filament of the present invention is composed of a single component may be an irregular cross-section such as a triangle, pentagon, octagon, star, flat, ellipse, etc. if necessary. However, the cross-sectional shape is preferably a round cross-section for stable yarn production and high-order processability.

When the fiber form of the polyester filament of the present invention is a core-sheath type composite fiber, it is preferable to use PET having a high IV as a core component. This is because the inside of the fiber has a high degree of orientation and promotes crystallization, so that the high strength necessary for a filament for screen wrinkles can be imparted. The IV of the core component PET is preferably 0.70 or more, more preferably 0.90 or more from the viewpoint of increasing the strength. On the other hand, it is preferably 1.40 or less, more preferably 1.30 or less, from the viewpoint of the fluidity of the molten polymer in melt spinning.

On the other hand, regarding the sheath component, from the viewpoint of obtaining good scum resistance, the IV of the polyester used for the sheath component is preferably lower than the IV of the core component polyester. The difference between the IV of the core component polyester and the IV of the sheath component polyester is preferably 0.20 to 1.00. Specifically, the IV of the low-viscosity polyester as the sheath component is preferably set to 0.40 or more, so that stable yarn forming properties can be obtained. The more preferable IV of the low-viscosity polyester as the sheath component is 0.50 or more. Further, in order to obtain good abrasion resistance, that is, scum resistance, the IV of the low-viscosity polyester is preferably 0.70 or less.

In the manufacturing process of screen cocoons, high-density woven fabrics are woven at high speed, so that they are exposed to strong friction such as cocoons very many times. In combination with the progress of crystallization of the filament surface, a part of the filament surface may be scraped off, and a so-called scum may be generated in the shape of beard or powder. Even if the amount of scum is small, it will be scattered on the loom, and some of the scum may be woven into the screen cage. Therefore, it is preferable that no scum is generated.

In the polyester filament of the present invention, the difference in IV between the polyester used for the sheath component and the core component polyester is preferably 0.20 or more. Thereby, the polyester of the sheath component, that is, the degree of orientation and crystallinity of the polyester filament surface can be suppressed, and better scum resistance can be obtained. Since the shear stress on the inner wall surface of the discharge port of the melt spinning is concentrated on the sheath component, the shear stress applied to the core component is reduced. As a result, the core component has a low degree of molecular chain orientation and is spun in a uniform state, so that the strength of the finally obtained polyester filament is improved. Further, the difference in IV of the polyester is preferably 0.30 to 0.70.

It is preferable that the inorganic particles added to the core component PET of the polyester filament of the present invention is less than 0.5% by mass based on the total amount of the core component. On the other hand, in the case of PET as a sheath component, it is preferable to add about 0.1 to 0.5% by mass of inorganic particles with respect to the total amount of the sheath component in order to improve the abrasion resistance of the polyester filament.

When the polyester filament of the present invention is a single fiber, the IV is preferably 0.7 or more, more preferably 0.9 or more, from the viewpoint of increasing the strength. On the other hand, from the viewpoint of the fluidity of the molten polymer in melt spinning, IV is preferably 1.4 or less, more preferably 1.3 or less. In consideration of scum resistance, the single fiber has lower strength and lower modulus than the composite fiber. Therefore, quality design that considers the use of the final product is required. In order to improve the abrasion resistance of the polyester filament, it is preferable to add about 0.1 to 0.5% by mass of inorganic particles with respect to the total amount of PET.

The core-sheath composite ratio when the polyester filament of the present invention is a composite fiber is preferably 70:30 to 90:10, more preferably 75:25 to 85:15 in terms of mass percentage. This is because, by setting the ratio of the core component to 70% or more, the necessary strength can be achieved even with fineness. In addition, by setting the ratio of the sheath component to 10% or more, the sheath component bears the shear stress on the inner wall surface of the die discharge hole of melt spinning, so that the shear force applied to the core component is reduced. As a result, the core component has a low degree of molecular chain orientation and is spun in a uniform state, so that the strength of the finally obtained polyester filament is improved.

The single yarn fineness of the polyester filament of the present invention is preferably 3 to 20 dtex. When used for high performance screens, for example, in a # 400 or higher high mesh screen suitable for precision printing, the mesh lattice spacing per line is approximately 63 μm. Therefore, in order to maintain the opening per lattice necessary for printing, the single yarn fineness of the filament used is preferably 13 dtex or less, more preferably 10 dtex or less.

On the other hand, in the case of filter use and clothing use, if it is 20 dtex or less, the target filter and clothing can be obtained.

In order to maintain the weaving property, particularly the warp feeding property, the polyester filament preferably has a single yarn fineness of at least 3 dtex or more, more preferably 4 dtex or more.

The breaking strength of the polyester filament of the present invention requires a high tension in proportion to the number of meshes when it is used for screen kneading. Therefore, the breaking strength of the polyester filament is preferably 5.0 cN / dtex or more. More preferably, it is 6.0 cN / dtex or more, More preferably, it is 7.5 cN / dtex or more.

Polyester filaments desirably have high strength, but a comprehensive balance with other physical properties and yarn-making properties is important. A practical upper limit of the breaking strength of the polyester filament is approximately 9.0 cN / dtex. If it is this range, neither a physical-property value nor a spinning property will fall, and it is preferable.

In order to improve the tension after tensioning at the time of screen cocoon manufacture and the release property at the time of screen printing, the strength at 5% elongation of the polyester filament (hereinafter referred to as 5% modulus) is also an important index. . The 5% modulus of the polyester filament of the present invention is 2.0 cN / dtex or more. In this case, the plate separation at the time of screen printing is good. More preferably, it is 3.0 cN / dtex or more. The 5% modulus is a value linked to the breaking strength of the material to some extent. If the breaking strength of the material is high, the 5% modulus tends to be high, which is one of the physical property values showing a positive correlation. It is difficult to set the 5% modulus alone, and the overall balance is important as is the breaking strength. The strength at 5% elongation of the polyester filament is preferably 7.0 cN / dtex or less.

On the other hand, in the case of filter use and clothing use, the target filter and clothing can be obtained at 2.0 cN / dtex or more.

The polyester filament of the present invention preferably has a stress difference of 3.0 cN or less during wet heat shrinkage in the longitudinal direction of the fiber. Here, the difference in wet heat shrinkage stress in the longitudinal direction of the fiber is a device provided with a tensiometer at a site that applies wet heat between two pairs of rollers that travel at a speed of 10 m / min. The value obtained by dividing the difference between the maximum value and minimum value of the tension when the yarn length is continuously monitored by the single yarn fineness of the filament.

In order to obtain a high strength and high modulus polyester filament for screen wrinkles required in the present invention, stress is generated inside the fiber due to an abrupt structural change when drawn at a high draw ratio. The stress relaxation does not progress uniformly in the package, and the difference in the stress relaxation causes sink marks. The state of stress relaxation can be confirmed by measuring the stress generated when the fiber is subjected to wet heat shrinkage. The fact that the stress during wet heat shrinkage is different in the longitudinal direction of the fiber indicates that stress relaxation has progressed in a certain portion and stress relaxation has not progressed in a certain portion. The occurrence of sink marks can be suppressed by setting the stress difference at the time of wet heat shrinkage in the fiber longitudinal direction to 3.0 cN / dtex or less. As a result, it is possible to obtain a high-quality screen wrinkle yarn suitable for precision printing, which has excellent dimensional stability as an object of the present invention and has no problem of quality such as sink marks. Furthermore, it is preferable that this stress difference is 2.0 cN / dtex or less because a higher sink suppression effect can be obtained.

On the other hand, in the case of filter use and clothing use, the target filter and clothing can be obtained at 3.0 cN / dtex or less.

The polyester filament package of the present invention has a peak period of wet heat shrinkage stress in the fiber longitudinal direction of 150 m or less. The peak of the stress appears at the end surface portion that is the folded portion of the package, and corresponds to the yarn pitch between the end surfaces. At the same time, this value indicates the period of sink marks. If this period is 150 m or less, it will not be recognized as a defect of sink marks when the screen is made after weaving. Therefore, it is preferable that the peak period of the wet heat shrinkage stress in the fiber longitudinal direction of the filament package is 150 m or less because the sink defect is reduced and the actual harm is eliminated.

According to the experiments by the present inventors, when the sink mark of the package becomes a screen jar, it is not recognized as a defect and does not cause any actual damage, depending on the number of meshes of the screen jar. The period is shorter as the mesh is higher, and the period is longer as the mesh is lower. However, when the peak period exceeds 150 m, sink defects become obvious, and the screen flaw becomes defective. On the other hand, if the peak period is 100 m or less, sink marks are preferably reduced, and if the peak period is 50 m or less, sink defects are further reduced. A method for controlling the peak period of sink marks will be described in detail in the paragraph of the manufacturing method described later.

Polyester filaments require higher strength and higher modulus than ordinary fibers when used for screens. For this reason, the degree of orientation of the PET amorphous part is large, and stress relaxation is likely to occur after winding as a package. Due to this stress relaxation, the yarn contracts and tightening occurs toward the center of the package. This winding tightening does not progress uniformly in the whole package, and differs in the straight part and end face part of the package, that is, in the longitudinal direction of the yarn. When stress relaxation, that is, a difference in shrinkage stress occurs in the longitudinal direction of the yarn, it becomes a sink-like defect when it is made into a screen wrinkle, and becomes apparent.

∙ Since the thread in the innermost layer of the package has a wound tube immediately on the inner layer side, the shrinkage of the yarn is hindered. As a result, the variation in shrinkage stress in the fiber longitudinal direction is the largest in the package. For this reason, when the winding tube hardness is soft, winding tightening is strongly generated due to relaxation of the stress of the yarn. This winding tightening is not uniform between the straight portion and the end surface portion of the package, and this shrinkage stress difference causes a sink-like defect in the inner layer of the package.

Even in the case of filter applications and clothing applications, the problem of sink marks due to the difference in shrinkage stress in the innermost layer of the package is a common problem to some extent. Sinks due to the difference in shrinkage stress are likely to appear in the straight part and end face part of the package.

The hardness of the wound tube of the present invention is 200 kgf / 100 mm or more. It is preferable that the winding tube has a hardness of 200 kgf / 100 mm or more because the difference in shrinkage stress between the innermost layers is reduced and sink marks are reduced. More preferably, it is 250 kgf / 100 mm or more, and most preferably 500 kgf / 100 mm or more.

The outer diameter of the wound tube of the present invention is 60 mmΦ or more. When the outer diameter of the winding tube is 60 mmΦ or more, a sufficient contact area is maintained between the spindle and the winding tube, and the adhesion of the winding tube is improved. As a result, there is no slip between the spindle and the winding tube, the traverse trajectory is correctly regulated, the occurrence of thread drop is small, and the package foam is not defective, which is preferable. The upper limit of the outer diameter of the wound tube is preferably 160 mmΦ or less, and in this case, the hardness of the wound tube can be maintained at 200 kgf / 100 mm or more.

Next, a preferred method for producing the polyester filament package of the present invention will be described. *

The manufacturing method of the polyester filament package of the present invention includes the following three steps. A polyester polymer such as PET is melted, discharged from the die, cooled, and then drawn by a roller at a constant speed, a drawing step in which the drawn undrawn yarn is drawn and heat-treated, and a drawn yarn is wound into a package. It is a winding process to form.

A known melt spinning method may be employed in the spinning process. That is, the polyester melted by the extruder is supplied to the spinneret using a metering pump so as to obtain a desired single yarn fineness, and the yarn is discharged. When the polyester is PET, the melt spinning temperature is preferably 280 to 310 ° C. from the viewpoint of sufficiently melting the PET and suppressing thermal decomposition due to excessive heat application.

When a core-sheath type composite fiber is used, the core component (component A) and the sheath component (component B) are separately melted and measured using two extruders, and both components are formed using a known core-sheath composite die. It is made to discharge after compounding. For the purpose of suppressing the alignment of the yarn and making the alignment uniform, a heating cylinder may be used at a site until the discharged yarn is cooled. When a heating cylinder is used, the atmospheric temperature in the heating cylinder is preferably 200 to 330 ° C. If the temperature inside the heating cylinder is 200 ° C. or higher, the effect of the heating cylinder is sufficiently obtained. If the temperature inside the heating cylinder is 330 ° C. or less, unevenness in the diameter of the yarn in the longitudinal direction is suppressed.

Moreover, it is preferable to employ cooling by chimney air as the cooling method. For the cooling with chimney air, for example, a method of spraying from a direction substantially perpendicular to the running direction of the yarn and from one direction, or a method of blowing from a direction substantially perpendicular to the running of the yarn and from the entire circumference can be used.

It is preferable to apply a spinning oil before taking out the cooled yarn with a roller. The composition of the spinning oil is preferably an oil containing 30% by mass or more of a fatty acid ester type smoothing agent from the viewpoint of improving smoothness and suppressing thread fluff during weaving. Further, the addition of about 0.1 to 5% by mass of polyether-modified silicone in the oil can further improve the smoothness.

The oil agent is mixed and emulsified with water, and applied to the yarn with an oiling guide or oiling roller. At this time, it is preferable that the amount of the oil agent attached to the drawn yarn is 0.1 to 2.0% by mass because the smoothness is good and the yarn dropping and breaking during the formation of the package are suppressed.

The lubricated yarn is preferably taken up by a take-up roller with a surface speed of 300 to 3000 m / min from the viewpoints of production efficiency, winding tension fluctuation suppressing effect, and orientation uniformity of the obtained yarn. It is manufactured by the direct spinning and drawing method (DSD method) which is continuously drawn and wound without being wound once.

In the stretching process, for the purpose of uniform stretching, a hot roller that heats the yarn above the glass transition point, and a method that sequentially draws and stretches the hot roller that has a higher surface speed than the hot roller and that heats above the crystallization temperature. Is preferably used. What is necessary is just to select the temperature and draw ratio of a hot roller according to the target physical property. For example, when high modulus and high modulus are desired, the surface temperature of the final hot roller is preferably 120 ° C. or higher, more preferably 200 ° C. or higher, and the draw ratio is preferably 3 to 6 times.

In addition, if another hot roller is installed between the hot rollers, and so-called multistage stretching is performed, the stretching uniformity is improved. In the case of multistage stretching, the first stage draw ratio is preferably 0.5 to 0.9 times the total draw ratio. Moreover, you may provide a non-heating roller between the last hot roller and a winding-up part. If the speed of the unheated roller is faster than the final hot roller, the resulting filament has a higher modulus. As a result, improvement in printing accuracy can be expected in the case of screen use. If the speed of the non-heated roller is slower than the final hot roller, the resulting filament modulus decreases. And the stress difference at the time of wet heat shrinkage is reduced, and thread fluff at the time of weaving is less likely to occur. The speed difference between the final hot roller and the non-heated roller may be adjusted according to desired characteristics. The speed of the non-heated roller with respect to the speed of the final hot roller is preferably -7 to + 2%.

In the winding process, the drawn filament is wound by the following winding method to obtain a desired package. First, as a method for forming the package end surface into a tapered shape, for example, a winding method described in JP-A-2002-284447 can be cited. The yarn winding machine reciprocates the yarn relatively in the bobbin axial direction by a traverse guide while continuously winding the yarn around a bobbin attached to the spindle. At that time, the spindle side is left stationary and the yarn is reciprocated and traversed via a traverse guide (Claim 4), or the yarn supply position of the yarn is fixed and the spindle side is reciprocated and traversed ( Claim 5) is disclosed in JP-A No. 2002-284447. In either case, the reciprocating width of the traverse is gradually decreased as the winding is increased so that a desired taper angle is obtained from the beginning of winding to the end of winding, thereby forming a package on the bobbin on the bobbin (paragraph [0015]).

In the present invention, the winding tension when winding the polyester filament is preferably 0.1 cN / dtex or more and 0.5 cN / dtex or less from the viewpoint of reducing the stress difference during wet heat shrinkage in the fiber longitudinal direction. . This is because, as described above, the polyester filament used in the present invention is more likely to undergo stress relaxation (shrinkage) after winding than normal fibers, and therefore, when the winding tension is high, the stress difference also increases. . The winding tension is more preferably 0.4 cN / dtex or less, and still more preferably 0.3 cN / dtex or less.

) The smaller the winding tension variation when winding the package, the better. If it is 0.4 cN / dtex or less, the wound form of the package is stable and the change in physical properties given to the yarn is small, which is preferable. More preferably, it is 0.3 cN / dtex or less, More preferably, it is 0.2 cN / dtex or less.

Further, the pressure at which the touch roller presses the package surface during winding, that is, the so-called surface pressure is preferably 15 gf / cm or less. If the surface pressure is 15 gf / cm or less, it is preferable that the yarn layer suffers little damage and does not promote the occurrence of yarn drop at the end face. More preferably, the surface pressure is 10 gf / cm or less.

The innermost layer winding width of the package is preferably 100 to 200 mm. The smaller the winding width of the package, the smaller the unwinding tension difference between the front side and the back side during unwinding. Therefore, the innermost layer winding width of the package is preferably 200 mm or less. Further, from the viewpoint of increasing the winding amount per package, the innermost layer winding width is preferably 100 mm or more. More preferably, it is 140 to 180 mm, and still more preferably 150 to 170 mm.

The package preferably has a traverse angle θ _t expressed by the following formula in a range of 0.1 to 1.5 °. Here, the twill angle is the winding angle of the yarn. A package angle of 0.1 ° or more is preferable because the pitch of the package end faces, that is, the end face period in the fiber longitudinal direction of the yarn can be shortened. By setting the end face period to 150 m or less, it is preferable to finely disperse the end face on the raw machine to reduce sink marks and improve the quality of the raw machine. Further, it is preferable that the twill angle is 1.5 ° or less, because the gradient of the unwinding tension does not increase and the package has a good unwinding property. More preferably, it is 0.3 to 1.3 °, and further preferably 0.5 to 1.0 °.

θ _t = tan ⁻¹ {W _f / ((L / 2) ² −W _f ² ) ^1/2 }
θ _t : Twill angle (°) W _f : Outermost layer package winding width (m) L: Yarn length per traverse (m)
The material of the winding tube used for the package is preferably “paper” or “paper + aluminum” from the viewpoint of handling and cost, but the material is not particularly limited as long as the hardness of the winding tube can be maintained.

パッケージ The end face period of the package becomes a sink mark on the living machine, and the conspicuous defect is manifested when the period becomes 5 mm or more. Therefore, it is preferable if this period can be shortened because it does not cause a defect on the living machine. The period of 5 mm or more varies depending on the weaving density, but it is preferable that the end face pitch of the raw yarn is within 150 m because the weaving density of # 200 to 500 can be covered.

Hereinafter, the embodiment will be described in detail. The evaluation in the examples followed the following method.

(1) Intrinsic viscosity (IV)
0.8 g of a sample polymer was dissolved in 10 mL of ortho-chlorophenol having a purity of 98% or more at a temperature of 25 ° C., and a relative viscosity ηr was determined by the following equation (1) using an Ostwald viscometer at a temperature of 25 ° C. Using this relative viscosity ηr, the intrinsic viscosity (IV) was calculated by the following formula (2).
ηr = η / η0 = (t × d) / (t0 × d0) (1)
Intrinsic viscosity (IV) = 0.0242 ηr + 0.2634 (2)
here,
・ Η: Viscosity of polymer solution ・ η0: Viscosity of ortho-chlorophenol ・ t: Dropping time of solution (second)
D: Density of solution (g / cm ³ )
T0: Ortho-chlorophenol drop time (seconds)
D0: density of ortho-chlorophenol (g / cm ³ ).

(2) Glass transition point (Tg)
A 10 mg powder of the polymer used was collected, and a peak associated with the glass transition developed in the temperature rising process while the temperature was raised at 16 ° C./min using a differential scanning calorimeter (Perkin Elmer: DSC-4 type) The glass transition temperature Tg (° C.) was determined by processing with a data processing system manufactured by PerkinElmer.

(3) Single yarn fineness A value obtained by scraping a yarn 500 m and multiplying the mass of the skein by 20 is defined as fineness, and a value obtained by dividing the numerical value by the number of filaments is defined as single yarn fineness.

(4) Tensile strength, elongation, 5% modulus, 10% modulus Strength at 5% elongation (5% modulus) at an initial sample length of 20 cm and a tensile speed of 2 cm / min using an orientex Tencilon tensile tester The strength at 10% elongation (10% modulus), the strength at break, and the elongation were measured, and the average of the values measured five times in succession was determined as the breaking strength (cN / dtex) and the elongation (% ) 5% modulus (cN / dtex), 10% modulus (cN / dtex).

(5) Wet heat shrinkage stress difference and peak period in the longitudinal direction of the fiber Using a filament thermal analysis system (abbreviation: FTA-500) manufactured by Toray Industries, Inc., measurement is performed under the following measurement conditions. The shrinkage stress was continuously measured with a tensiometer and charted, and the difference between the maximum stress and the minimum stress was read. The peak period is the time from the maximum stress peak on the chart to the next maximum stress peak, or the time from the minimum stress peak to the next minimum stress peak, and is calculated from the yarn speed at the time of measurement and the chart speed. Calculated.
Wet heat temperature: 100 ° C
Yarn feeding tension: 19.6 cN
Measuring thread length: 400m
Measurement yarn speed: 20 m / min Chart speed: 2 cm / min.

(6) Tension fluctuation value The tension applied to the running yarn was measured for 1 minute at a position 20 cm after passing through the final roller using a P / C compatible tension meter manufactured by Intec, and the difference between the maximum value and the minimum value was obtained. .

(7) Winding tube hardness and outer diameter The winding tube hardness is a value measured by the following method. An annular test piece having a length of 50 mm or more is cut out from the sample winding tube, left to stand at 23 ± 2 ° C. for 60 minutes or more, and then sandwiched between two flat plates, and “10 ± 2 mm / min. The maximum strength when compressed to 1/2 of the outer diameter at a speed of “. The test temperature is 23 ± 2 ° C. On the other hand, arbitrary 5 points | pieces were measured for the outer diameter with the caliper, and it was set as the average value.

(8) Evaluation of yarn-making property Evaluation was made based on the number of yarn breakage occurrences during spinning for 48 hours. The passing level is ◯ or higher.
A: No thread breakage.
○: 2 times or less.
X: 3 times or more.

(9) Package foam, thread drop Forms such as a deformed shape of the wound polyester filament package and both end faces were visually inspected, and the average number of thread drops per package (N = 10) was counted. The pass level is ◎, ○ or △.
(Double-circle): Foam defect and no thread drop.
○: Minor thread drop 1 to 2 places less than 1 cm in length.
Δ: Minor thread drop 3-5 places less than 1 cm in length
X: There are thread drops of 1 cm or more in length, or 6 or more light thread drops of less than 1 cm in length.

(10) Sink and Weaving Step The following three types of mesh fabrics (screen wrinkles) having a width of 2.54 m and a total length of 30 m were manufactured with a through the loom at a rotation speed of the loom of 120 rpm. The screen scissors obtained were inspected, and the evaluation of the sink marks and the weaving steps (the following ◎ to ×) was performed visually. The pass level is ◎, ○ or △.
・ Fineness 20dtex, 25dtex: Weaving density 250 / 2.54cm
・ Fineness 10dtex: Weaving density 380 / 2.54cm
・ Fineness 6dtex: Weaving density 420 / 2.54cm
・ Fineness 3dtex: Weave density 500 / 2.54cm
A: There are no sink marks or weaves.
○: There is a slight sink or weave, but it is a pass level.
Δ: Slightly strong sink / weave, but acceptable level.
X: There is a strong sink or weave and it is a rejected level.

(Example 1)
PET containing 0.3% by mass of titanium oxide of IV 1.10 (Tg 80 ° C.) polymerized and chipped by a conventional method was melted at 295 ° C. by an extruder. The molten PET was passed through a pipe kept at 290 ° C. and then discharged from a known spinneret 1. The spinning process and the drawing process were based on the DSD method, and the apparatus shown in FIG. 1 was used.

The discharge yarn is positively kept warm by a heating body so that the ambient temperature is 290 ± 10 ° C. for 100 mm downward from the die surface, and then air at 25 ° C. is supplied at 10 m / min by the yarn cooling air device 3. The yarn was sprayed from one direction at the wind speed to cool and solidify.

The yarn after supplying an oil containing 40% by mass of a fatty acid ester-based smoothing agent and 1% by mass of a polyether-modified silicone is taken up by the take-up roller 5 as it is with a surface speed of 1300 m / min. A first hot roller 7 having a surface speed of 1310 m / min and a surface temperature of 90 ° C., a second hot roller 8 having a surface speed of 4000 m / min and a surface temperature of 90 ° C., a third hot roller 9 having a surface speed of 4980 m / min and a surface temperature of 130 ° C. And after passing through non-heated rollers (godet rollers) 10 and 11 having a surface speed of 4950 m / min, which takes a speed difference of -0.6% with respect to the third hot roller 9 as the final hot roller, Take-up tension 0.3 cN / dtex, take-up tension fluctuation 0.2 cN / dtex, surface pressure 10 kgf / cm, traverse angle 0.8 °, traverse speed 68 m / min Using the yarn winding device 12, which is your was wound bobbins hardness 500 kgf / 100 mm, the winding tube of aluminum + Kamigaihi the winding outer diameter 120 mm. The obtained polyester monofilament package had a single yarn fineness of 6 dtex, an end portion of the package having a taper shape, a winding width of the innermost layer of 200 mm, a taper angle of 26 °, and a winding amount of 1.0 kg. . The yarn-making property was good without yarn breakage.

At this time, the first stage draw ratio was 3.1 times and the total draw ratio was 3.8 times. The monofilament obtained had a fineness of 6 dtex, a breaking strength of 5.5 cN / dtex, and an oil adhesion amount of 0.3 mass. %Met. As a result of measuring the wet heat shrinkage stress in the longitudinal direction of the yarn of the innermost layer part of the collected polyester monofilament package, the wet heat shrinkage stress difference between the straight part and the end face of the package is 1.1 cN / dtex, the peak period is 15 m, and this value is It coincided with the cycle of the package end face.

When weaving evaluation of the screen wrinkles was performed using a polyester monofilament package sample collected under the same conditions, weaving steps and sink marks were not observed, and it was confirmed that the fabric quality was acceptable. Detailed results are shown in Table 1.

(Example 2)
PET of IV1.10 (Tg80 ° C.) polymerized and chipped by a conventional method was used as a core component, and PET containing IV0.50 (Tg78 ° C.) containing 0.3% by mass of titanium oxide was used as a sheath component. The spinning process and the drawing process were based on the DSD method, and the apparatus shown in FIG. 1 was used. The core component and the sheath component were each melted at 295 ° C. by individual extruders. The melted PET is passed through a pipe kept at 290 ° C., and then discharged and measured from a known core-sheath type composite spinneret so that the core: sheath mass ratio is 80:20 and the fineness after stretching is 10 dtex. The sheath type composite yarn was discharged. The discharge yarn is positively kept warm by a heating body so that the ambient temperature is 290 ± 10 ° C. for 100 mm downward from the base surface, and then air at 25 ° C. is blown at a wind speed of 10 m / min with a yarn cooling air device. The yarn was sprayed from one direction to cool and solidify.

In the stretching step, the core-sheath composite monofilament package was wound up according to Example 1 except that the first R speed was finely adjusted to 1210 m / min.

At this time, the first stage draw ratio was 3.3 times, the total draw ratio was 4.1 times, the fineness of the obtained core-sheath composite monofilament was 10 dtex, the breaking strength was 6.3 cN / dtex, and the oil adhesion amount was 0.3. 3%. Similar to Example 1, the wet heat shrinkage stress of the collected polyester monofilament package innermost layer in the longitudinal direction of the yarn was measured. As a result, the difference in shrinkage stress between the straight portion and the end face of the package was 1.2 cN / dtex, and the peak period was 14 m. This value was consistent with the period of the package end face. When weaving evaluation of the screen wrinkle was performed using the core-sheath composite polyester monofilament package sample collected under the same conditions, weaving steps and sink marks were not recognized in the weaving process, and it was confirmed that the fabric quality was acceptable. Detailed results are shown in Table 1.

(Example 3)
A polyester multifilament package was basically wound up in the same manner as in Example 1 except that the monofilament of Example 1 was an 8-filament (F) multifilament and the fineness was changed from 6T to 20T.

The total draw ratio at this time was 3.8 times, the fineness of the obtained multifilament was 20 dtex, the breaking strength was 5.5 cN / dtex, and the oil adhesion amount was 0.3% by mass. As a result of measuring wet heat shrinkage stress in the longitudinal direction of the collected polyester multifilament package innermost layer, the difference in shrinkage stress between the straight part and the end face of the package was 1.1 cN / dtex, and the peak period was 15 m. It coincided with the period of the end face. When weaving evaluation of the screen wrinkle was performed using a polyester monofilament package sample collected under the same conditions, weaving steps and sink marks were not recognized in the weaving process, and it was confirmed that the fabric quality was acceptable. Detailed results are shown in Table 1.

Example 4
A polyester multifilament package was basically wound up according to Example 2 except that the core-sheath composite monofilament of Example 2 was a multifilament of 8 filaments (F) and the fineness was changed from 6 dtex to 20 dtex. The total draw ratio at this time was 4.1 times, the fineness of the obtained multifilament was 20 dtex, the breaking strength was 6.3 cN / dtex, and the oil adhesion amount was 0.3 mass%. As a result of measuring the wet heat shrinkage stress in the longitudinal direction of the yarn collected at the innermost layer of the collected polyester multifilament package, the difference in shrinkage stress between the straight part and the end face of the package was 1.2 cN / dtex, and the peak period was 14 m. It coincided with the period of the end face. Using a polyester multifilament package collected under the same conditions as a weft, a thin plain fabric sample was prepared for weaving and evaluated for weaving. As a result, we confirmed that the fabric quality was acceptable. Detailed results are shown in Table 1.

(Example 5)
A polyester monofilament package was obtained in the same manner as in Example 1 except that a winding tube having a winding tube hardness of 620 kgf / 100 mm was used. When the obtained polyester monofilament package was evaluated for weaving the screen wrinkles, weaving steps and sink marks were not recognized in the weaving process, and it was confirmed that the fabric quality was acceptable. Detailed results are shown in Table 1.

(Example 6)
A polyester monofilament package was obtained in the same manner as in Example 1 except that a winding tube having a winding tube hardness of 300 kgf / 100 mm was used. When the obtained polyester monofilament package was evaluated for weaving of the screen basket, it was confirmed that the fabric quality was acceptable. Detailed results are shown in Table 1.

(Example 7)
A polyester monofilament package was obtained in the same manner as in Example 1 except that a wound tube having a wound tube hardness of 200 kgf / 100 mm was used. When the obtained polyester monofilament package was evaluated for weaving the screen wrinkles, weaving steps and sink marks were slightly noticeable as compared with Example 1, but the fabric quality was acceptable. Detailed results are shown in Table 1.

(Comparative Example 1)
A polyester monofilament package was obtained in the same manner as in Example 1 except that a winding tube having a winding tube hardness of 180 kgf / 100 mm was used. When the obtained polyester monofilament package was evaluated for weaving the screen wrinkles, weaving steps and sink marks became apparent and the quality of the fabric was rejected. Detailed results are shown in Table 1.

(Example 8)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the spindle was changed and a wound tube having an outer diameter of 60 mmΦ was used. Since the outer diameter of the wound tube was 60 mmΦ, a sufficient contact area was maintained between the spindle and the wound tube, the adhesion was good, and no slip occurred between the spindle and the wound tube, and the traverse locus Was properly regulated, and there was little occurrence of thread dropping, and a package with good foam was obtained. When the obtained polyester monofilament package was evaluated for weaving of the screen basket, it was confirmed that the fabric quality was acceptable. Detailed results are shown in Table 1.

(Comparative Example 2)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the outer diameter of the wound tube was reduced to 55 mmΦ. The gripping force between the spindle and the winding tube was weak, and the traverse was out of the normal trajectory. Since the yarn breakage also occurred, the evaluation of the subsequent samples was canceled. Detailed results are shown in Table 1.

Example 9
Except for adjusting the speed difference between the

non-heated rollers

10 and 11 to -5% with respect to the third hot roller 9 so that the 5% modulus and 10% modulus are 2.6 cN / dtex and 3.5 cN / dtex, respectively. A polyester monofilament package was obtained in the same manner as in Example 1. There was no particular problem with the yarn-making property, and although the tension of the screen ridge was slightly low, the fabric quality was acceptable. Detailed results are shown in Table 1.

(Comparative Example 3)
As in Example 9, the speed difference of the non-heated roller is forced to −10% with respect to the third hot roller 9 so that the 5% modulus and 10% modulus are 1.8 cN / dtex and 2.8 cN / dtex, respectively. Brought down. When the obtained sample was used for a screen basket, the tension after tension during the production of the screen basket was insufficient, and the fabric quality was not acceptable. Detailed results are shown in Table 1.

(Example 10)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the single yarn fineness was changed to 3 dtex. Compared with Example 1, thread breakage tended to increase. In addition, as a result of the weaving evaluation, weft barely maintained the weft transportability and the fabric quality was acceptable. Detailed results are shown in Table 1.

(Example 11)
A polyester monofilament package was obtained in the same manner as in Example 2 except that the breaking strength was changed to 9 cN / dtex. Although the yarn breakage tended to increase as compared with Example 1 due to stretching at a high magnification, it was within the acceptable level. Evaluation of weaving of screen cocoon When weaving evaluation of screen cocoon was conducted, it was confirmed that the quality of the fabric was acceptable. Detailed results are shown in Table 2.

Example 12
A winding test of the polyester monofilament package was performed in the same manner as in Example 2 except that the conditions were changed so that the breaking strength was 10 cN / dtex. Although the yarn breakage was somewhat frequent, the fabric quality was confirmed to be acceptable. Detailed results are shown in Table 2.

(Example 13)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the winding tension was changed to 0.5 cN / dtex. When weaving evaluation of the screen koji was performed, weaving steps and sink marks were slightly noticeable as compared with Example 1, but the quality of the fabric was acceptable. Detailed results are shown in Table 2.

(Example 14)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the winding tension in Example 13 was further increased to 0.6 cN / dtex. Compared to Example 13, weaving steps and sink marks became more prominent, but the fabric quality was acceptable. Detailed results are shown in Table 2.

(Example 15)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the winding tension variation was changed to 0.4 cN / dtex. When weaving evaluation of the screen koji was performed, weaving steps and sink marks were slightly noticeable as compared with Example 1, but the fabric quality was barely acceptable. Detailed results are shown in Table 2.

(Example 16)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the winding tension fluctuation in Example 15 was further increased and changed to 0.5 cN / dtex. Compared to Example 15, weaving steps and sink marks became more prominent, but the fabric quality was barely acceptable. Detailed results are shown in Table 2.

(Example 17)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the surface pressure was changed to 15 gf / cm. Although slight thread dropping occurred, it was at a level that could be unraveled. When weaving evaluation of the screen wrinkles was continued, weaving steps and sink marks were slightly noticeable compared to Example 1, but the fabric quality was acceptable. It was. Detailed results are shown in Table 2.

(Example 18)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the surface pressure in Example 17 was further increased to 20 gf / cm. Although thread dropping, weaving steps, and sink marks became more prominent than Example 17, the fabric quality was barely acceptable. Detailed results are shown in Table 2.

(Example 19)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the wet heat shrinkage stress difference was changed to 3.0 cN / dtex. When weaving evaluation of the screen koji was performed, the difference in wet heat shrinkage stress was 3.0 cN / dtex, so that sink marks and weaving steps were generated, but it was barely acceptable. Detailed results are shown in Table 2.

(Example 20)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the wet heat shrinkage stress difference was changed to 4.0 cN / dtex. When weaving evaluation and printing evaluation were conducted on the screen, slight sinking was noticeable, but it was barely acceptable. Detailed results are shown in Table 2.

(Example 21)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the twill angle of the package was changed and the peak period of wet heat shrinkage stress was increased to 60 m. When weaving evaluation of the screen wrinkle was performed, the peak period of the wet heat shrinkage stress was 60 m, so the defect of sink marks was acceptable. Detailed results are shown in Table 2.

(Example 22)
A polyester monofilament package was obtained in the same manner as in Example 1 except that the twill angle of the package was changed and the peak period of wet heat shrinkage stress was increased to 150 m. When weaving evaluation of the screen koji was performed, the peak period of the wet heat shrinkage stress was 150 m, so the defect of sink marks was acceptable. Detailed results are shown in Table 2.

(Comparative Example 4)
A polyester monofilament package was obtained in the same manner as in Example 22 except that the peak period of the wet heat shrinkage stress was increased to 170 m. When weaving evaluation of the screen wrinkle was performed, the peak period of wet heat shrinkage stress was as long as 170 m, sink marks became apparent, and the quality of the fabric was rejected. Detailed results are shown in Table 2.

(Example 23)
A polyester monofilament package was obtained according to Example 1 except that the innermost layer winding width was changed to 220 mm. When the yarn from the package was unwound, the unwinding tension varied greatly between the front and back of the package, and the driving tension during weaving varied, but the fabric quality was barely acceptable. Detailed results are shown in Table 2.

(Comparative Example 5)
After supplying the yarn, it is wound once in the state of undrawn yarn, and this is drawn by a two-step method so as to have a predetermined physical property with a normal drawing machine, and the winding tube hardness is 500 kgf / 100 mm, and the winding tube outer diameter is 120 mmΦ. The apparatus shown in FIGS. 2 and 3 was used. As a result of evaluating the package, the interval between the wet heat shrinkage stress peaks was as long as 550 m, sink marks became apparent, and the fabric quality was unacceptable. Detailed results are shown in Table 2.

According to the present invention, in order to stably obtain a high-mesh screen wrinkle capable of high-precision printing, the fiber surface and the internal fiber structure are excellent in control and uniformity, and high-quality that does not cause quality problems such as sink marks and halation. A fine filament high-strength filament can be obtained. Such a filament can be suitably used for filters and clothing, and has very high industrial utility value.

1: Spinneret 2: Heating body 3: Yarn cooling air device 4: Oil supply roller 5: First godet roller 6: Temperature-controlled warming container 7: First roller 8: Second roller 9: Final roller 10: Second Godet roller 11: Third godet roller 12: Yarn winding device 13: Spinneret 14: Heating body 15: Yarn cooling air device 16: Oil supply roller 17: First godet roller 18: Second godet roller 19: Yarn winding device 20: Undrawn yarn 21: Supply roller 22: First roller 23: Final roller 24: Temperature-controlled warming container 25: Godet roller 26: Yarn winding device

Claims

The 5% modulus of a yarn wound around a winding tube having a hardness of 200 kgf / 100 mm or more and an outer diameter of 60 mmΦ or more is 2.0 cN / dtex or more, and the peak period of wet heat shrinkage stress in the fiber longitudinal direction is 150 m or less. Polyester filament package characterized by being.
2. The polyester filament package according to claim 1, wherein the wound yarn has a single yarn fineness of 3 to 20 dtex.
3. The polyester filament package according to claim 1, wherein the wound yarn has a breaking strength of 5.0 to 9.0 cN / dtex.
The polyester filament package according to any one of claims 1 to 3, wherein a difference in wet heat shrinkage stress in the longitudinal direction of the wound yarn is 3.0 cN / dtex or less.