JP2019203215A - Polyester filament package and manufacturing method - Google Patents

Abstract

To provide a polyester filament package free of weaving steps, horizontal, sink, and fluff when woven.SOLUTION: This can be achieved with a polyester filament package characterized in that a polyester filament wound around a tube having a hardness of 200 kgf/100 mm or more and an outer diameter of 60 mmΦ or more satisfies the following (1) to (3). (1) A flatness (maximum), which is the ratio of the maximum diameter A (major axis) of the fiber cross section and the diameter B (minor axis) perpendicular to the major axis in the package innermost layer to outermost layer, is 1.00 to 1.25. (2) A elongation is 5-50%. (3) A winding density is 0.60-1.20 g/cm.SELECTED DRAWING: None

Description

  The present invention relates to a polyester filament package and a method for manufacturing the same. Specifically, it is a high-definition, high-strength, excellent uniformity, excellent anti-sink effect, and the cross-section of the polyester filament is not deformed or flattened over the entire length of the package. The present invention relates to a high-quality polyester filament package that can be suitably used for a screen for precision printing, and a method for manufacturing the same.

  Conventionally, mesh fabrics made of natural fibers such as silk and inorganic fibers such as stainless steel have been widely used as screen wrinkles. In recent years, synthetic fiber meshes excellent in flexibility, durability, and cost competitiveness have been used favorably.

  Screen printing is used for, for example, 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.

  The properties required for the polyester filament used for realizing the above-mentioned required performance include a monofilament excellent in fineness, high strength and dimensional stability. In order to increase the strength and modulus of the polyester monofilament, it is necessary to stretch the polyester monofilament 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 the fiber obtained by high-strength drawing is wound with PAN, it often does not advance uniformly throughout the PAN package, and the portion where stress relaxation has not progressed appears as streaky abnormal luster. This gloss abnormality is called sink.

  On the other hand, as a main use other than the screen basket in the polyester monofilament, there is a filter that requires a filtration function. For example, a filter for engine oil and a filter for water purification can be mentioned. Moreover, the use in clothing is mentioned as a use in a multifilament. Of course, other uses can also be applied without problems.

  Screen weaves are used for printing through a process of coating an emulsion, weaving it, exposing it to light and curing it, 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 glossiness from the normal portion, and causes photosensitive spots and 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.

  In general, the higher the precision of screen printing, the greater the number of screen meshes used. For this reason, polyester 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. The reason for this is that, as the printing accuracy increases, the tension of 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.

  Also, in recent years, when used as wefts for screen reeds, stepped gloss abnormalities (horizontal) manifested in screen reeds when using polyester monofilament at the initial stage of package winding, as a stepped gloss abnormality different from sink marks, In addition, a step-like gloss abnormality (weaving step) that becomes apparent at a portion connecting the innermost layer of the package and the outermost layer of the next package may be confirmed. This is a defect that lowers the quality of the screen wrinkles, which causes a difference in glossiness from the normal part and causes photosensitive spots and the like during emulsion exposure.

  Various techniques have been proposed in response to such demands. For example, Patent Documents 1 and 2 relating to composite monofilaments disclose techniques for obtaining high-quality screen wrinkles with fineness, high strength, and high modulus. These documents disclose controlling the heat-and-heat shrinkage stress difference in the longitudinal direction of the fiber with respect to pirn sinks. In Patent Document 3, a spindle winding method based on a direct spinning drawing method is used to wind up with a taper angle on a bobbin, and the taper angle, the yarn-thread friction coefficient, the unwinding tension fluctuation gradient, the winding thickness of the package layer 1 mm A technique is disclosed in which defects such as thread fluff, sink marks, and weaving steps are not caused by weaving by forming a package in which fluctuations in polyester wet heat shrinkage stress are defined. Patent Document 4 discloses a technique in which uncrystallized polyester yarn is relieved from fiber crystallization by multi-stage drawing to control the occurrence of fiber internal strain and to suppress panic marks. 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 with good foam stability is disclosed. In Patent Document 6, by defining the winding tube type, the 5% modulus of the yarn, and the peak period of the wet heat shrinkage stress in the longitudinal direction of the fiber, the fineness, high strength, and dimensional stability when made into a screen wrinkle are improved. A technique for obtaining a package that is excellent and has few defects such as sink marks and halation is disclosed.

International Publication No. 2010/090108 JP 2013-249143 A International Publication No. 2011/086954 JP 2001-355123 A Japanese Patent Laid-Open No. 08-199424 Japanese Patent Laid-Open No. 2006-69789

  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 technology described in Patent Document 5 is mainly aimed at preventing package yarn drop and improving the unraveling property, and has not been solved regarding improvement studies on sink marks, internal structure of fibers, and physical properties. Although the technique described in Patent Document 6 reduces the occurrence of defects such as sink marks and halation, when used as a weft of a screen kite, the initial stage of winding the package is used as a stepped gloss abnormality different from sink marks. In some cases, a step (horizontal step) that occurs at the time of wrapping, and a step (weaving step) that occurs at the connecting portion of the package are observed. Similar to sink marks, this is a defect that reduces the quality of the screen wrinkles, which causes a difference in glossiness from the normal part and causes photosensitive spots during emulsion exposure.

  The object of the present invention is to solve such a conventional problem and to provide a polyester filament package suitable for high-performance screen wrinkles as well as applications other than screen wrinkles with less occurrence of stepped gloss abnormality defects. There is to do.

In order to solve the above problems, the present invention has the following configuration.
(1) A polyester filament package in which a polyester filament wound around a wound tube having a hardness of 200 kgf / 100 mm or more and an outer diameter of 60 mmΦ or more satisfies the following (a) to (c).
(A) In the filament from the innermost layer to the outermost layer of the package, the flatness (maximum), which is the ratio of the maximum diameter A (major axis) of the fiber cross section and the diameter B (minor axis) perpendicular to the major axis, is 1.00 to 1. .25
(B) Elongation is 5 to 50%
(C) The winding density is 0.60 to 1.20 g / cm ³
(2) The polyester filament package according to (1), wherein the package satisfies the following (d) to (g).
(D) The winding width of the innermost layer is 100 to 300 mm
(E) The ratio of the winding width of the innermost layer to the winding width of the outermost package layer is 1.1 to 4.0.
(F) The shape of the whole package is a cheese shape. (G) The shape of the package end is a taper shape, and the taper angle θ is 5 to 75 degrees. (3) The wound yarn has a fineness of 3 to 20 dtex and a breaking strength. The polyester filament package according to (1) or (2), wherein the polyester filament package is 5.0 to 10.0 cN / dtex.
(4) After switching from the full pipe side during winding to the empty pipe side where winding is started next, after forming a package having a thickness of 0.1 mm or more, contact the contact roll, The method for producing a polyester filament package according to any one of (1) to (3), wherein winding is performed at ˜6.0 degrees.
(5) The speed up rate from the normal winding speed on the empty pipe side and the full pipe side when switching from the full pipe side during winding to the next empty pipe side to start winding is switched at 1.5% or less. (4) The method for producing a polyester filament package according to (4).
(6) The rate of increase in speed from the normal winding speed on the empty tube side and the full tube side when switching from the full tube side during winding to the empty tube side to start winding next is 3.0% or less and the empty tube The method for producing a polyester filament package according to (4), characterized in that switching is performed when the speed-up rate difference between the side and the full pipe side is 1.5% or less.
(7) The winding tension difference before and after switching from the full pipe side during winding to the empty pipe side where winding is started next is 5 cN or less. The manufacturing method of the polyester filament package of description.

  The present invention provides a polyester filament package free from weaving steps, horizontal dents, sink marks and thread fluff when made into a woven fabric.

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

Hereinafter, the present invention will be described in detail.
In the polyester filament package of the present invention, for example, a polyester mainly composed of polyethylene terephthalate (hereinafter referred to as PET) can be 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 may contain a copolymerization component capable of forming other ester bonds in a proportion of less than 10 mol%.

  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 constituting the polyester filament package 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.

  As the polyester filament constituting the polyester filament package of the present invention, either a composite fiber or a single component fiber can be used. 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. It is preferable that the core component and the sheath component are arranged concentrically and close to a round cross section for stable spinning and higher processability.

  The cross section of the filament constituting the polyester filament package of the present invention has a flatness A / B (flatness (maximum)), which is a ratio of the maximum diameter A (long diameter) of the fiber cross section and the diameter B (short diameter) perpendicular thereto. It is important that it is 1.00-1.25. The flatness A / B, which is the ratio of the maximum diameter A (major axis) of the fiber cross section and the diameter B (minor axis) orthogonal to the major axis, from the innermost layer to the outermost layer of the package is 1.00 to 1.25. Regardless of the outermost layer of the package, regardless of the innermost layer, the surface layer is peeled off to an arbitrary point of the package and the filament is collected five times, and the maximum diameter A (major axis) and the major axis of each filament cross section are repeated. A cross section of a diameter B (short diameter) fiber orthogonal to is observed, the lengths of the long diameter portion and the short diameter portion are measured, and the maximum value of the ratio is defined as the flatness of the package. When the flatness is 1.00 to 1.25, it becomes difficult for a level of gloss abnormality such as a horizontal or weaving level to appear during weaving. Since the step at the time of weaving becomes more difficult to appear as it approaches the perfect circle, it is more preferably 1.00 to 1.20, and even more preferably 1.00 to 1.15.

  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 from the viewpoint of increasing strength, and is preferably 1.40 or less from the viewpoint of fluidity of the molten polymer in melt spinning. More preferably, it is 0.90-1.30.

  On the other hand, regarding the sheath component, from the viewpoint of obtaining good scum resistance, it is preferable that the IV of the polyester used for the sheath component is lower than the IV of the core component polyester. The IV of the low-viscosity polyester as the sheath component is preferably 0.40 or more because stable yarn forming properties can be obtained. Moreover, by making it 0.70 or less, favorable abrasion resistance, ie, scum resistance, can be obtained, which is preferable. The IV of the low-viscosity polyester as the sheath component is more preferably 0.50 to 0.70.

  The IV difference between the core component and the sheath component is preferably 0.20 to 1.00. 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. The IV difference between the core component and the sheath component is more preferably 0.30 to 0.70.

  Furthermore, since the high density fabric is woven at a high speed in the manufacturing process of the screen wrinkles, it is exposed to strong friction such as wrinkles extremely 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 scum is small in quantity, it will be scattered on the loom, and a part of it will be woven into the screen basket, which may reduce the product quality. Therefore, it is preferable that no scum is generated.

  It is preferable that the inorganic particles added to the core PET of the polyester filament of the present invention is less than 0.5% by mass with respect to the total amount of the core component. On the other hand, 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 based on the total amount of the sheath component.

  When the polyester filament of the present invention is a single component, IV is preferably 0.7 or more because it leads to an increase in the strength of the filament. By making it 1.4 or less, the fluidity of the molten polymer in melt spinning is improved. Therefore, it is preferable. 0.9-1.3 is more preferable. In consideration of the scum resistance, the single component filament has lower strength and lower modulus than the composite component filament. Therefore, quality design that considers the use of the final product is required. And in order to improve the abrasion resistance of a polyester filament, it is preferable to add about 0.1-0.5 mass% of inorganic particles with respect to PET whole quantity.

The core-sheath composite ratio when the polyester filament of the present invention is a composite filament 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 polyester filament constituting the package of the present invention preferably has a wound yarn having a fineness of 3 to 20 dtex and a breaking strength of 5.0 to 10.0 cN / dtex.

  The polyester filament preferably has a fineness of 3 dtex or more in order to maintain the weaving property, particularly the weft transportability. In the case of a filter application or a garment application, the target filter or garment can be obtained if it is 20 dtex or less. preferable.

  When a polyester filament is used for a high-performance screen wrinkle, for example, in a # 400 or higher high mesh screen wrinkle suitable for precision printing, the mesh lattice spacing per line is approximately 63 μm. Therefore, in order to maintain the opening per lattice required for printing, it is more preferably 3 to 13 dtex, and further preferably 4 to 10 dtex.

  The breaking strength of the polyester filament of the present invention is preferably 5.0 cN / dtex or more because the breaking strength of the polyester filament requires a high tension tension in proportion to the number of meshes when used for screen wrinkling. On the other hand, 10.0 cN / dtex or less is preferable in order to prevent other physical properties and degradation of the yarn forming property. More preferably, it is 6.0-10.0 cN / dtex, More preferably, it is 7.5-10.0 cN / dtex.

  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. . On the other hand, the 5% modulus is one of the physical property values showing a positive correlation with the breaking strength, so it is difficult to set it alone. The 5% modulus of the polyester filament of the present invention is preferably 2.0 cN / dtex or more because it provides good release properties during screen printing, and is suitable for use in filters and clothing. On the other hand, 7.0 cN / dtex or less is preferable in order to prevent other physical properties and a decrease in the spinning property. More preferably, it is 3.0-7.0 cN / dtex.

  It is important that the elongation of the polyester filament constituting the package of the present invention is 5 to 50%. When the elongation is 5 to 50%, the cross section of the polyester filament is not deformed or flattened, and the effect of suppressing sink marks is excellent. In addition, it has excellent process passability and handling in high-order processing processes such as weaving, improved shock absorption and wear resistance, and excellent dimensional stability that does not cause wrinkle elongation when screens are used. Can be obtained. More preferably, it is 10-40%, More preferably, it is 12-40%.

It is important that the winding density of the package of the present invention is 0.60 to 1.20 g / cm ³ . When the winding density is in the range of 0.60 to 1.20 g / cm ³ , the cross section of the polyester filament is not deformed or flattened, and is excellent in the suppression effect of sink marks and the like. If it is 0.60 g / cm ³ or more, the package is difficult to collapse during transportation or handling. In addition, at 1.20 g / cm ³ or less, even if the filament contracts with a delay, the winding is not tightened too much and the diameter of the wound tube does not contract too much. More preferably, it is 1.03-1.18 g / cm < ³ >, More preferably, it is 1.03-1.17 g / cm < ³ >.

  The polyester filament of the present invention preferably has a stress difference of 3.0 cN or less during wet heat shrinkage in the fiber longitudinal direction. 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 where wet heat is applied between two pairs of rolls traveling at a speed of 10 m / min. The value obtained by dividing the difference between the maximum and minimum tension values when the yarn length is continuously monitored by the 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 a sudden 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 a filter application or a garment application, a target filter or garment can be obtained if it is 3.0 cN / dtex or less.

  In the polyester filament package of the present invention, the peak period of wet heat shrinkage stress in the fiber longitudinal direction is preferably 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 flaw, it is not recognized as a defect and the actual harm is lost depending on the number of meshes of the screen flaw. 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.

  When the polyester filament is used for screens, it requires higher strength and higher modulus than ordinary fibers. 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.

  The yarn in the innermost layer of the package has a wound tube immediately on the inner layer side, so that the shrinkage of the yarn is inhibited. 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 apparel 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.

  It is important that the winding tube used in the polyester filament package of the present invention has a hardness of 200 kgf / 100 mm or more and an outer diameter of 60 mmΦ or more. When the hardness is in this range, the difference in shrinkage stress of the innermost layer is reduced, and sink marks are reduced. Preferably it is 300 kgf / 100 mm 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, the package foam does not become defective, and the winding amount is easily increased. More preferably, it is 60 to 160 mmΦ. In this case, the hardness of the wound tube can be easily maintained at 200 kgf / 100 mm or more. More preferably, it is 60-140 mmΦ.

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

  The manufacturing method of the polyester filament package of this invention consists of the following three processes. Polyester polymer such as PET is melted, discharged from the die, cooled, and then a spinning process in which the roll is pulled at a constant speed, a drawing process in which the drawn undrawn yarn is drawn and heat-treated, and the drawn yarn is wound into a package. It is a winding process to form.

  In the spinning step, a known melt spinning method may be adopted. That is, the polyester melted by the extruder is supplied to the spinneret using a metering pump so as to have a desired fineness, and the yarn is discharged. When the polyester is PET, the melt spinning temperature is preferably 260 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 using a heating cylinder, it is preferable that the atmospheric temperature in a heating cylinder shall be 200-360 degreeC. If the temperature inside the heating cylinder is 200 ° C. or higher, the effect of the heating cylinder is sufficiently obtained. If the atmospheric temperature in the heating cylinder is 360 ° C. or less, the uneven fiber diameter in the yarn 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 agent before pulling the cooled yarn with a roll. 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. Moreover, smoothness can be further improved by adding about 0.1 to 5.0% by mass of a polyether-modified silicone in the oil.

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

  The lubricated yarn is preferably taken up by a take-up roll with a surface speed of 300 to 3000 m / min from the viewpoint 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 step, for the purpose of uniform stretching, a hot roll that heats the yarn above the glass transition point, and a method in which the surface speed is higher than the hot roll and the hot roll that is heated above the crystallization temperature is sequentially drawn and stretched. Is preferably used. What is necessary is just to select the temperature and draw ratio of a hot roll according to the target physical property. For example, when high modulus is required with high strength, the surface temperature of the final hot roll is preferably 120 ° C. or higher, more preferably 200 ° C. or higher, and the draw ratio is preferably 3 to 6 times.

  Further, if another hot roll is installed between the hot rolls 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 roll between the last hot roll and a winding part. If the speed of the non-heated roll is higher than the final hot roll, 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 roll is slower than the final hot roll, 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 roll and the non-heated roll may be adjusted according to desired characteristics. The speed of the non-heated roll is preferably −7 to + 2% with respect to the speed of the final hot roll.

  In the winding step, the stretched 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 reciprocally traverses the yarn in the bobbin axial direction by a traverse guide while continuously winding the yarn on a bobbin mounted on a 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 Japanese Patent Laid-Open 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 flatness A / B (flatness (maximum)), which is the ratio of the maximum diameter A (major axis) of the fiber cross section and the diameter B (minor axis) perpendicular to the major axis, is 1.00 to 1.25. In order to achieve this, during winding by the above method, when the package becomes full, it switches to the empty tube side and starts winding, but the thickness of the yarn forming package on the winding tube is 0.1 mm. After the above, by bringing the contact roll into contact with the yarn forming package, it is possible to prevent flattening due to deformation of the fiber cross-section that occurs when the package in the innermost layer and the contact roll come into contact. Thereby, the cross-sectional shape of the fiber from the innermost layer to the outermost layer is made uniform, and the change width of the flatness can be suppressed as compared with the prior art.

  In the present invention, the winding tension when winding the polyester filament is preferably 0.1 to 0.5 cN / dtex 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 susceptible to stress relaxation (shrinkage) after winding than ordinary 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 polyester filament package is preferably manufactured with a tension difference of 5 cN or less before and after switching from the full tube side during winding to the empty tube side where winding is started next. If the tension difference is 5 cN or less, the difference in shrinkage stress between the winding start, which is the innermost layer of the package, and the winding end, which is the outermost layer of the package, is small. It is preferable because it becomes better. When the tension difference is 5 cN or more, an excessive tension is applied to the polyester filament, so that the yarn is easily broken. However, when a material having a higher fineness or strength level is used, thread breakage is less likely. In this case, the tension difference may be increased. Since the above-described speed-up rate is also involved in tension control, it is important to set in consideration of both.

  Further, the pressure at which the contact roll 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, and more preferably the surface pressure is 5 gf / cm.

The polyester filament package of the present invention preferably satisfies the following (d) to (g).
(D) The winding width of the innermost layer is 100 to 300 mm
(E) The ratio of the winding width of the innermost layer to the winding width of the outermost package layer is 1.1 to 4.0.
(F) The shape of the whole package is a cheese shape. (G) The shape of the package end is a taper shape, and the taper angle θ is preferably 5 to 75 degrees. The innermost layer winding width of the package is preferably 100 to 300 mm. An innermost layer winding width of 100 mm or more is preferable because the amount of winding per package can be increased with a stable foam. By setting the innermost layer winding width to 300 mm or less, the smaller the winding width of the package, the smaller the unwinding tension difference between the front side and the back side during unwinding, which is preferable. 150 to 300 mm is more preferable, and 150 to 250 mm is more preferable.

The ratio of the winding width of the innermost layer to the winding width of the outermost package layer is preferably 1.1 to 4.0. It is obvious that the ratio of the winding width becomes larger than 1.0 by forming the package form in a taper shape and increasing the winding amount, and if it is 4.0 or less, the surface pressure on the package does not become too high, It is possible to suppress an abnormality in gloss after weaving due to the fact that foam collapse is less likely to occur and the filament cross-section is less likely to be crushed. 1.1 to 2.5 is more preferable. It is more preferable that it is 1.1-2.1.
The shape of the entire package is preferably a cheese shape. The cheese shape is preferable because the winding amount per package can be increased without tightening as compared with a package having a small winding tube diameter. Moreover, if it is cheese shape, since unwinding property becomes favorable, it is preferable.

  The shape of the end portion of the package is a tapered shape, and the taper angle θ is preferably 5 to 75 degrees. A taper angle θ of 5 ° or more is preferable because it can be wound in a package that forms a cheese shape. Further, it is preferable that the taper angle θ is 75 degrees or less because the yarn can be wound while preventing the thread from dropping from the tapered portion. As the taper angle θ increases, the innermost layer winding width of the package is maintained, and a sufficient winding amount can be obtained in a cheese shape. On the other hand, the larger the taper angle θ, the easier it is to drop the yarn from the tapered portion. Preferably it is 20-50 degrees, More preferably, it is 20-30 degrees.

  The polyester filament package of the present invention has a speed-up rate of 1.5% from the normal winding speed on the empty tube side and the full tube side when switching from the full tube side during winding to the empty tube side to start winding next. It is preferable to obtain by switching at% or less. Further, the polyester filament package of the present invention has a speed increase rate of 3 from the normal winding speed on the empty tube side and the full tube side when switching from the full tube side during winding to the empty tube side where winding is next started. It is preferable to obtain it by switching at 0.0% or less and the difference in speed-up rate between the empty tube side and the full tube side is 1.5% or less. As is well known, the speed-up rate is increased by comparing the empty tube side with the full tube side, for example, the distance from the hot roll, tension cut roll, and each guide to the winding tube when the winder rotates during switching. When it fluctuates, it is set so that winding can be continued without loosening the yarn. If the speed-up rate is 1.5% or less or the speed-up rate difference is 1.5% or less compared to the roll immediately before winding on the winding tube, it is possible to start winding uniformly in the drum width direction, and the winding shape is Become good. It is possible to maintain the unwinding property by suppressing the misalignment on the surface of the low-density package. Also, in order to increase the switching success rate when switching from the full winding side to the empty tube side, a notch is provided at the end of the winding tube, and a thread is gripped at the notch at the end of the empty tube so that the winding is wound on the empty tube side. When we continue to take the thread, the thread will start to cut. When setting the speed-up rate by automatically controlling the take-up tension, it is necessary to set the speed-up rate according to the width and depth of the notch. A certain amount of time is required, and after completion of the rotation operation, it slides to the center of the winding tube to form cheese winding, so when the yarn starts to be wound on the empty tube side, Set the width and depth of the notch that can consume the waiting time, since the package is formed on the empty tube side after the winder is consumed by the cut on the empty tube side and the operation of the winder involved in switching is completed. For example, when the cutting depth is deep, the length of the yarn wound when the winding tube makes one rotation is different. Therefore, if the speed increase rate is low, the yarn loosens, so the yarn breaks and the switching fails. There is a fear. For this reason, it is preferable to add appropriately the speed-up rate according to a notch with respect to the preferable range of the above-mentioned speed-up rate. However, if the rate of speed increase remains high when the package is formed, if the package winding amount is large, the package will be tightened, so the diameter of the winding tube will be small, and there is a risk of poor delivery from the winder. Further, even if the take-out from the winder can be performed, the winding will be tightened over time, so that there may be a problem that it cannot be set on the creel stand used for warping or weaving. Moreover, since the shrinkage rate of the yarn in the innermost layer of the package is increased, this leads to a drawback when it is folded. Therefore, when the winding machine switching operation is completed, it is filled with a thread so that the diameter of the winding tube is the same as the place where there is no notch in the notch, and the winding slides at the center to form a package. Thus, it is preferable to control the speed-up rate to be 0%.

  The polyester filament package can be contacted with a contact roll after forming a package with a thickness of 0.1 mm or more after switching from the full tube side during winding to the empty tube side where winding is started next. It is preferable to obtain by winding as 0.1 to 6.0 degrees.

  Since the contact roll is brought into contact after a package having a thickness of 0.1 mm or more is formed, that is, winding is started with the contact roll floating in the initial stage of winding. Here, the winding tube used in the present invention has a hardness of 200 kgf / 100 mm or more, and the contact roll made of metal or high-hardness resin is harder than the filament on the package. For this reason, when the filament package is thin, when the package and the contact roll come into contact, each filament at the contact portion of the package surface layer is sandwiched between the winding tube and the contact roll, and stress is concentrated. Thus, the more the fiber cross section of the filament is deformed, the more flattened and flattened. In this state, when it is made into a screen flaw etc., it becomes an abnormal portion of gloss and becomes apparent as a horizontal defect. Alternatively, when there is a difference in rotation speed between the contact roll and the package at the contact timing, the surface of the filament may be scraped by the contact roll, resulting in thread fluff and further breakage of the yarn. If the thickness of the package is 0.1 mm or more, the thickness will be a cushion, and the stress applied to each filament will be dispersed, so it will not be flattened and flattened. It is hard to become. Further, even when there is a speed difference between the package and the contact roll, the stress is dispersed by the cushion effect, so that the thread does not become thread fluff or break. Moreover, since the winding start of the innermost layer where the shrinkage stress becomes higher in the package can be reduced by floating and winding 0.1 mm or more, the shrinkage stress difference from the winding end of the outermost layer of the package can be reduced, It is difficult to reveal as a weaving step when it is made into a kite. 0.2 to 10.0 mm is more preferable from the viewpoint of cushioning guarantee and shrinkage stress difference, and the original purpose for contacting and rolling the contact roll, and suppressing foam failure when the package is rolled up. . 0.2-3.0 mm is still more preferable, and 0.2-0.5 mm is the most preferable.

The twill angle is preferably in the range of 0.1 to 6.0 degrees. Here, the winding angle a winding angle theta _t represented by the following formula, is that the winding angle of the yarn. If the traverse angle of the package is 0.1 degree or more, the pitch of the package end face, that is, the end face period in the fiber longitudinal direction of the yarn can be shortened, which is preferable. 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, if the twill angle is 6.0 degrees or less, the thread does not easily fall off at the taper portion of the package. From the viewpoint of thread drop, 0.1 to 3.0 degrees is more preferable. Moreover, if it is 0.3-1.5 degree | times, since the gradient of unwinding tension fluctuation | variation does not become large and it becomes a package with favorable unraveling property, 0.5-1.0 degree | times is the most preferable.
θ _t = tan ⁻¹ {W _f / ((L / 2) ² −W _f ² ) ^1/2 }
θ _t : Twill angle (degree) W _f : Outermost layer 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.

  The fact that the package end face period becomes a sink on the living machine and becomes conspicuous as a defect becomes apparent 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. Although the period of 5 mm or more varies depending on the weaving density, it is preferable if the end face pitch of the raw yarn is within 150 m, since 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 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 formula (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: Drop time of solution (seconds)
D: Density of solution (g / cm ³ )
T0: Ortho-chlorophenol drop time (seconds)
D0: ortho-chlorophenol density (g / cm ³ ).

(2) Glass transition point (Tg)
10 mg of the powder of the polymer used was collected, and a peak associated with the glass transition developed in the temperature rising process while heating 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) Fineness A value obtained by taking 500 m of the filament and multiplying the mass of the skein by 20 is defined as the fineness of the filament.

(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) Winding density The winding density was determined from the weight and volume of the polyester filament constituting the package. For the weight, the total weight of the package is weighed, and the weight obtained by subtracting the weight of the pre-weighed winding tube is taken as the weight of the filament. The volume was calculated from the following equation (3) from the outermost layer winding width, the innermost layer winding width, the outermost layer winding diameter, and the wound tube outer diameter. The winding density was calculated from the following equation (4) from the filament weight and filament volume.
Volume = volume of package taper portion + volume of package straight portion−volume of winding tube in contact with filament = π (w _f −W _f ) ((R / 2) ² + (Rr / 4) + (r / 2) ² ) / 3
+ ΠW _f (R / 2) ² −πw _f (r / 2) ² (3)
Winding density = M / V (4)
V: filament volume, M: filament weight, _{W f:} the outermost layer winding width, _{w f:} the innermost layer winding width,
R: outermost layer winding diameter, r: winding tube outer diameter.

(6) Winding tension The tension applied to the traveling yarn was measured for 1 minute at a position 20 cm after passing through the final roll using a P / C-compatible tension meter manufactured by Intec Corporation.

(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 in a direction perpendicular to the tube axis”. 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 calipers, and the average value was obtained.

(8) Package foam, thread drop The form of the rolled up polyester filament package, etc., and both end faces are visually inspected (by one skilled person), and the average number of thread drops per package (N = 10) I 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.
(Triangle | delta): 3-5 places of slight thread droppings 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.

(9) Weaving stage, Yokochika 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 at a rotation speed of 120 times / min. The obtained screen wrinkle was inspected (by one skilled person) and visually evaluated for the weaving step and the side (N = 3) as follows. The pass level is ◎, ○ or △.
・ Fineness 20dtex, 25dtex: Weaving density 250 / 2.54cm
・ Fineness 10dtex, 13dtex: Weaving density 380 / 2.54cm
・ Fineness 6dtex: Weaving density 420 / 2.54cm
・ Fineness 3dtex, 4dtex: Woven density 500 / 2.54cm
◎: There is no weaving step or okochika, and it is a pass level.
○: There are minor weaving steps and sideways, but it is acceptable.
△: Slightly strong weaving steps and sideways, but acceptable level.
X: Strong weaving stairs / horizontals exist and fail.

(10) Sink, thread fluff With a through the loom, 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 at a rotation speed of the loom of 120 rpm. The obtained screen wrinkle was inspected (by one skilled person) and visually evaluated as follows for sink marks and thread fluff (N = 3). The pass level is ◎, ○ or △.
・ Fineness 20dtex, 25dtex: Weaving density 250 / 2.54cm
・ Fineness 10dtex, 13dtex: Weaving density 380 / 2.54cm
・ Fineness 6dtex: Weaving density 420 / 2.54cm
・ Fineness 3dtex, 4dtex: Woven density 500 / 2.54cm
A: There is no sink mark or fluff and it is a pass level.
○: Passive level with slight sink marks and threads.
Δ: Slightly strong sink / thread fluff but acceptable level.
X: A strong sink / thread fluff exists and is a rejected level.

(11) Flatness The surface layer is peeled off to an arbitrary point on the package and the filament is collected five times, and the maximum diameter A (major axis) of the cross section of each filament and the diameter B perpendicular to the major axis ( The cross section of the short diameter fiber was observed, the lengths of the long diameter section and the short diameter section were measured, and the maximum value of the ratio was defined as the flatness of the package.

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 with the take-up roller 5 as it is with a surface speed of 1300 m / min, and then is not wound up once. 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 which is the final hot roller, Using a yarn winding device 12 controlled at a take-up tension of 0.3 cN / dtex, a surface pressure of 10 gf / cm, a twill angle of 0.8 degrees, and a traverse speed of 68 m / min, Winding was started on a winding tube of aluminum + paper skin having a tube hardness of 500 kgf / 100 mm and a winding tube outer diameter of 120 mmΦ, and after the thickness of the package reached 0.5 mm, the contact roll was brought into contact and further winding was continued. After the weight of the filament package becomes 1 kg, the speed is increased by increasing the speed of the empty-winding tube side and the full-winding tube side to 1.5%. %. Thereafter, the contact roll was brought into contact after the thickness of the package reached 0.5 mm, and the winding was continued until the weight of the filament package reached 1 kg again. Each of the obtained polyester filament packages has a single yarn fineness of 6 dtex, a taper shape at the end of the package, a winding width of the innermost layer of the package of 200 mm, The taper angle at the end was 26 degrees.

  At this time, the first stage draw ratio was 3.7 times, the total draw ratio was 4.7 times, the fineness of the obtained filament was 6 dtex, the breaking strength was 5.5 cN / dtex, and the oil adhesion amount was 0.4. It was mass%. 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 filament package, the wet heat shrinkage stress difference between the straight part and the end face of the package is 0.3 cN / dtex, the peak period is 15 m, and this value is It coincided with the cycle of the package end face. Further, the outermost layer point where the ratio of the major axis to the inner diameter of the filament cross section of the package is 1 kg is 1.04, the point where the weight is peeled off to 0.5 kg is 1.05, and the point where the weight is peeled off to 0.3 kg is 1 0.04, the point where the weight was peeled off to 0.1 kg was 1.05, and the point where the weight was peeled off to 0.01 kg was 1.06, so the flatness (maximum) was 1.06.

  When weaving evaluation of the screen wrinkles was performed using the polyester filament package sample collected under the same conditions, weaving steps, sink marks, horizontal edges and thread fluff were not observed, and it was confirmed that the quality of the fabric was acceptable. Detailed results are shown in Tables 1 and 2.

(Example 2)
Conventionally polymerized and chipped IV 1.10 (Tg 80 ° C.) PET as a core component, IV 0.50 (Tg 78 ° C.) PET as a sheath component, the fineness after stretching is 10 dtex, the first hot roller speed is 1210 m / The core-sheath composite monofilament was wound up under the same conditions as in Example 1 except that the minute was changed. The evaluation results are as shown in Tables 1 and 2.

Example 3
The multifilament was wound up under the same conditions as in Example 1 except that the fineness was changed to 20 dtex and the number of filaments was 8. The evaluation results are as shown in Tables 1 and 2.

Example 4
The core-sheath composite multifilament was wound up under the same conditions as in Example 2 except that the fineness was changed to 20 dtex and the number of filaments was 8. The evaluation results are as shown in Tables 1 and 2.

(Example 5)
The monofilament was wound up under the same conditions as in Example 1 except that the winding tube hardness was 620 kgf / 100 mm. The evaluation results are as shown in Tables 1 and 2.

(Example 6)
The monofilament was wound up under the same conditions as in Example 1 except that the winding tube hardness was 300 kgf / 100 mm. The evaluation results are as shown in Tables 1 and 2.

(Example 7)
The monofilament was wound up under the same conditions as in Example 1 except that the winding tube hardness was 200 kgf / 100 mm. The evaluation results are as shown in Tables 3 and 4.

(Example 8)
The monofilament was wound up under the same conditions as in Example 1 except that the outer diameter of the wound tube was 60 mmΦ. The evaluation results are as shown in Tables 3 and 4.

Example 9
The monofilament was wound up under the same conditions as in Example 1 except that the outer diameter of the wound tube was 90 mmΦ. The evaluation results are as shown in Tables 3 and 4.

(Example 10)
Implemented except that the speed difference between the non-heated rolls 10 and 11 was adjusted to -5% with respect to the third hot roll 9 so that the 5% modulus and 10% modulus were 2.1 cN / dtex and 3.0 cN / dtex, respectively. The monofilament was wound up under the same conditions as in Example 1. The evaluation results are as shown in Tables 3 and 4.

(Example 11)
The monofilament was wound up under the same conditions as in Example 1 except that the fineness was changed to 3 dtex. The evaluation results are as shown in Tables 3 and 4.

(Example 12)
The core-sheath composite monofilament was wound up under the same conditions as in Example 2 except that the first hot roller speed was 900 m / min. The evaluation results are as shown in Tables 3 and 4.

(Example 13)
The core-sheath composite monofilament was wound up under the same conditions as in Example 2 except that the first hot roller speed was 800 m / min. The evaluation results are as shown in Tables 3 and 4.

(Example 14)
The monofilament was wound up under the same conditions as in Example 1 except that the winding tension was changed to 0.5 cN / dtex. The evaluation results are as shown in Tables 5 and 6.

(Example 15)
The monofilament was wound up under the same conditions as in Example 1 except that the winding tension was changed to 0.6 cN / dtex and the winding tension difference was changed to 4.2 cN. The evaluation results are as shown in Tables 5 and 6.

(Example 16)
The monofilament was wound up under the same conditions as in Example 1 except that the surface pressure was changed to 15 gf / cm. The evaluation results are as shown in Tables 5 and 6.

(Example 17)
The monofilament was wound up under the same conditions as in Example 1 except that the surface pressure was changed to 20 gf / cm. The evaluation results are as shown in Tables 5 and 6.

(Example 18)
The monofilament was wound up under the same conditions as in Example 1 except that the innermost layer winding width was changed to 220 mm. The evaluation results are as shown in Tables 5 and 6.

Example 19
The monofilament was wound up under the same conditions as in Example 1 except that the package thickness at the time of contact roll contact was changed to 0.2 mm. The evaluation results are as shown in Tables 5 and 6.

(Example 20)
The monofilament was wound up under the same conditions as in Example 1 except that the package thickness when contacting the contact roll was changed to 5.0 mm. The evaluation results are as shown in Tables 5 and 6.

(Example 21)
The monofilament was wound up under the same conditions as in Example 1 except that the winding density of the package was changed to 0.75 g / cm ³ and the taper angle was changed to 50 degrees. The evaluation results are as shown in Tables 7 and 8.

(Example 22)
The monofilament was wound up under the same conditions as in Example 1, except that the winding density of the package was 0.60 g / cm ³ , the outer diameter of the winding tube was 150 mmΦ, the innermost layer winding width was 150 mm, and the taper angle was 75 degrees. The evaluation results are as shown in Tables 7 and 8.

(Example 23)
The monofilament was wound up under the same conditions as in Example 1, except that the winding density of the package was 1.20 g / cm ³ , the outer diameter of the winding tube was 60 mmΦ, the innermost layer winding width was 300 cm, and the taper angle was changed to 5 degrees. The evaluation results are as shown in Tables 7 and 8.

(Example 24)
Speed up rate on the empty pipe side is changed to 3.0%, speed up rate on the full pipe side is changed to 1.5%, the speed up rate difference is 1.5%, the outer diameter of the wound tube is 150 mmΦ, and the taper angle is changed to 20 degrees. The monofilament was wound up under the same conditions as in Example 1 except that. The evaluation results are as shown in Tables 7 and 8.

(Example 25)
Example 1 except that the speed up rate on the empty pipe side is 2.2%, the speed up rate on the full pipe side is 1.2%, the speed up rate difference is 1.0%, and the taper angle is 30 degrees. The monofilament was wound up under the same conditions. The evaluation results are as shown in Tables 7 and 8.

(Example 26)
The monofilament was used under the same conditions as in Example 1 except that the speed up rate on the empty pipe side was changed to 1.0%, the speed up rate on the full pipe side was changed to 0.5%, and the speed up rate difference was changed to 0.5%. Winded up. The evaluation results are as shown in Tables 7 and 8.

(Example 27)
The monofilament was used under the same conditions as in Example 1 except that the speed-up rate on the empty tube side was changed to 0.5%, the speed-up rate on the full-tube side was changed to 0.2%, and the speed-up rate difference was changed to 0.3%. Winded up. The evaluation results are as shown in Tables 9 and 10.

(Example 28)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 0.1 degree. The evaluation results are as shown in Tables 9 and 10.

(Example 29)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 0.3 degrees and the fineness was changed to 4 dtex. The evaluation results are as shown in Tables 9 and 10.

(Example 30)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 0.5 degrees and the fineness was changed to 13 dtex. The evaluation results are as shown in Tables 9 and 10.

(Example 31)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 1.0 degree. The evaluation results are as shown in Tables 9 and 10.

(Example 32)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 1.5 degrees. The evaluation results are as shown in Tables 9 and 10.

(Example 33)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 3.0 degrees. The evaluation results are as shown in Tables 11 and 12.

(Example 34)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 6.0 degrees. The evaluation results are as shown in Tables 11 and 12.

(Example 35)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 0.05 degrees. The evaluation results are as shown in Tables 11 and 12.

(Example 36)
The monofilament was wound up under the same conditions as in Example 1 except that the twill angle was changed to 10 degrees. The evaluation results are as shown in Tables 11 and 12.

(Comparative Example 1)
The monofilament was wound up under the same conditions as in Example 1 except that the package was brought into contact with the contact roller immediately after the start of winding onto the winding tube. The evaluation results are as shown in Tables 11 and 12.

(Comparative Example 2)
The monofilament was wound up under the same conditions as in Example 1 except that the outer diameter of the wound tube was 55 mmΦ. The evaluation results are as shown in Tables 11 and 12.

(Comparative Example 3)
The monofilament was wound up under the same conditions as in Example 1 except that the package thickness at the time of contact roll contact was 0.0 mm, that is, immediately after the start of winding. The evaluation results are as shown in Tables 11 and 12.

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 wind device 4: Oil supply roll 5: First godet roll 6: Temperature controlled heat-insulating container 7: First hot roll 8: Second hot roll 9: Third hot roll 10: Second godet roll 11: Third godet roll 12: Yarn winding device 13: Spinneret 14: Heating body 15: Yarn cooling air device 16: Refueling roll 17: First godet roll 18: Second godet roll 19: Yarn winding Apparatus 20: Undrawn yarn 21: Supply roll 22: First hot roll 23: Second hot roll 24: Temperature-controlled warming container 25: Godet roll 26: Yarn winding device

Claims (7)

A polyester filament package characterized in that a polyester filament wound around a winding tube having a hardness of 200 kgf / 100 mm or more and an outer diameter of 60 mmΦ or more satisfies the following (1) to (3).
(1) In the filament from the innermost layer to the outermost layer of the package, the flatness (maximum), which is the ratio between the maximum diameter A (major axis) of the fiber cross section and the diameter B (minor axis) perpendicular to the major axis, is 1.00 to 1. .25
(2) Elongation is 5-50%
(3) Winding density is 0.60 to 1.20 g / cm ³ The polyester filament package according to claim 1, wherein the package satisfies the following (4) to (7).
(4) The winding width of the innermost layer is 100 to 300 mm
(5) The ratio of the winding width of the innermost layer to the winding width of the outermost package layer is 1.1 to 4.0.
(6) The shape of the whole package is a cheese shape. (7) The shape of the package end is a tapered shape, and the taper angle θ is 5 to 75 degrees.   The polyester filament package according to claim 1 or 2, wherein the wound yarn has a fineness of 3 to 20 dtex and a breaking strength of 5.0 to 10.0 cN / dtex.   After switching from the full tube side during winding to the empty tube side where winding is next started, a package with a thickness of 0.1 mm or more is formed and then the contact roll is brought into contact, and the twill angle is 0.1 to 6. The polyester filament package manufacturing method according to any one of claims 1 to 3, wherein winding is performed at 0 degrees.   The speed up rate from the normal winding speed on the empty tube side and the full tube side when switching from the full tube side during winding to the next empty tube side to start winding is switched at 1.5% or less. The manufacturing method of the polyester filament package of Claim 4.   When switching from the full pipe side during winding to the empty pipe side where winding is started next, the speed increase rate from the normal winding speed on the empty pipe side and the full pipe side is 3.0% or less and the empty pipe side is full. The method for producing a polyester filament package according to claim 4, wherein the difference in speed-up rate on the tube side is switched to 1.5% or less.   The polyester according to any one of claims 4 to 6, wherein a difference in tension during winding before and after switching from the full pipe side during winding to the empty pipe side where winding is started next is 5 g or less. A method for manufacturing a filament package.