EP3859057A1 - Monofilament de polyester pour tissu de tamis et tissu à mailles tissées pour la fabrication directe de plaques numériques - Google Patents

Monofilament de polyester pour tissu de tamis et tissu à mailles tissées pour la fabrication directe de plaques numériques Download PDF

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Publication number
EP3859057A1
EP3859057A1 EP19865767.8A EP19865767A EP3859057A1 EP 3859057 A1 EP3859057 A1 EP 3859057A1 EP 19865767 A EP19865767 A EP 19865767A EP 3859057 A1 EP3859057 A1 EP 3859057A1
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EP
European Patent Office
Prior art keywords
yarn
dtex
polyester monofilament
screen mesh
printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP19865767.8A
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German (de)
English (en)
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EP3859057A4 (fr
Inventor
Shunsuke Kosaka
Hisashi SASAGAWA
Tomoyuki Ichikawa
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Toray Industries Inc
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Toray Industries Inc
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Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Publication of EP3859057A1 publication Critical patent/EP3859057A1/fr
Publication of EP3859057A4 publication Critical patent/EP3859057A4/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B41C1/148—Forme preparation for stencil-printing or silk-screen printing by a traditional thermographic exposure using the heat- or light- absorbing properties of the pattern on the original, e.g. by using a flash
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/24—Stencils; Stencil materials; Carriers therefor
    • B41N1/247—Meshes, gauzes, woven or similar screen materials; Preparation thereof, e.g. by plasma treatment
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/096—Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes

Definitions

  • the present invention relates to a polyester monofilament suitable for high-mesh woven fabrics for screen mesh cloth applications. More specifically, the present invention relates to a polyester monofilament for a screen mesh cloth suitable for direct digital platemaking, which is a novel high-definition printing technique which performs direct platemaking and printing by digital processing using a computer and in which a positive film is not used and a dyeing process is not required.
  • a woven mesh fabric made of natural fibers or inorganic fibers has been widely used.
  • synthetic meshes which are excellent in flexibility, durability, and cost performance, particularly woven mesh fabrics made of polyester among those are widely used, and are used in a wide range of applications, such as textile printing, identification printing, high accuracy printing of graphic designs such as label printing of compact discs, electronic substrate circuit printing, and the like.
  • the substrate circuit have also become more precise and compact, and it is strongly required that the screen mesh cloth has high printing accuracy.
  • the strength and the modulus of the monofilament as the constituent elements have been increased.
  • the technical revolution is advanced also in the platemaking process.
  • a gray fabric obtained by warping and weaving is dyed in yellow to inhibit halation, and a processed cloth is produced by heat setting.
  • This processed cloth is applied to a plate frame with high tension, and a photosensitive emulsion mainly composed of diazo-based compounds is applied, and then the positive film and the plate are pressed to be bonded in an exposure process, and the photosensitive emulsion is solidified by ultraviolet irradiation.
  • an unsolidified portion of the photosensitive emulsion is removed and a negative is prepared, and the plate frame is filled with the coating material and then the coating agent is applied to the object by squeezing to perform printing.
  • the most important process from the viewpoint of printing accuracy is an alignment process of the positive film and the printing plate. While the alignment of the positive film and the printing plate directly influences the printing accuracy, the alignment operation is largely dependent on the experience, knowledge, and sensation of the operator, and a large number of artificial factors tend to cause variations.
  • Direct digital platemaking is a platemaking/printing technique in which a printing pattern is digitized by a computer, a photosensitive emulsion on a platemaking surface is treated with a laser based on optical output, and a pattern is formed on a printing plate by direct exposure. Since the printing pattern is directly formed by the computer, a positive film is not necessary and thus the cost of the positive film can be reduced, and the alignment with the positive film is eliminated so that the printing accuracy is improved as compared with the conventional screen printing method.
  • Patent Literatures 1 and 2 which disclose typical monofilaments for a screen mesh cloth, titanium oxide, which is also known as a matting agent, is contained, and the screen mesh cloth is dyed in yellow in the dyeing process to prevent halation.
  • titanium oxide which is also known as a matting agent
  • the screen mesh cloth is dyed in yellow in the dyeing process to prevent halation.
  • titanium oxide there are cases in which a chemical substance for preventing halation is contained in the polymer itself.
  • Patent Literature 3 a spun-dyed monofilament in which an organic compound-based yellow pigment is contained in a polymer has been proposed, and in addition to the effect of preventing halation, a dyeing process is not required, so that the environmental load can be reduced.
  • Patent Literature 4 an ultraviolet absorbent is contained in the polymer, the screen mesh cloth is dyed in yellow, and the exposure and the photosensitive emulsion curing are performed to improve the effect of preventing halation.
  • a treatment for preventing halation during exposure and photosensitive emulsion curing is indispensable.
  • direct digital platemaking there is no restriction on the content of titanium oxide and the color of the screen mesh cloth since the influence of halation is small.
  • the curing time of the photosensitive emulsion can be significantly shortened by using the transparent raw yarn excellent in transparency for a laser to be used during exposure for the screen mesh cloth.
  • the platemaking process can be made more efficient, and high accuracy printing can be performed in a short time. From this viewpoint, as a monofilament for a screen mesh cloth used in direct digital platemaking, a transparent bright monofilament having excellent laser transparency is preferable.
  • Patent Literatures 1 and 2 titanium oxide is contained as described above, and the screen mesh cloth is dyed in yellow in the dyeing process.
  • titanium oxide and the dye hinder the laser transmission, it is difficult to say that the monofilaments are suitable for direct digital platemaking.
  • Patent Literature 3 in addition to titanium oxide, an organic compound-based pigment is contained, but it is difficult to say that it is suitable for direct digital platemaking from the viewpoint of inhibiting the laser transmission.
  • Patent Literature 4 in addition to the fact that the yellow dye hinders the laser transmission, the strength and modulus of the screen mesh cloth are reduced due to shrinkage during dyeing, so that the dimensional stability and the printing accuracy of the screen mesh cloth are reduced. Therefore, it is also difficult to say that it is suitable for the direct digital platemaking, in which there is no restriction on the color of the screen mesh cloth.
  • the multifilament for clothing disclosed in Patent Literature 5 has a reduced titanium oxide content in order to improve transparency and esthetics, a screen mesh cloth has a higher quality requirement than a woven fabric for clothing, and even if the technique described in Patent Literature 5 is applied to a monofilament for a screen mesh cloth, the monofilament cannot withstand the abrasion resistance with the reed in weaving. That is, since the content of metal particles to form fine unevenness on the surface of the fiber, such as titanium oxide, is small, the friction coefficient between the raw yarn and the metal is high, and it is obvious that printing defects such as fluffing, scum or the like are caused in weaving. In addition, since a multifilament has poor uniformity of the fiber diameter compared with a monofilament, it is not preferable as a raw yarn for the screen mesh cloth.
  • an object of the present invention is to provide a monofilament which is suitable for direct digital platemaking, in which a positive film is not used and direct platemaking is performed without a dyeing process, excellent in laser transparency so that an emulsion curing time can be shortened, and also excellent in higher order passability in a weaving process.
  • the present invention includes any one of the following configurations (1) to (3).
  • the monofilaments of the present invention having excellent transparency at a wavelength of 405 nm used for exposure can be suitably used for direct digital platemaking, and the emulsion curing time can be shortened, high-definition screen printing can be performed in a short time, and printing defects such as fluffing and scum occurring during weaving can be reduced.
  • the polyester monofilament for a screen mesh cloth of the present invention is a polyester monofilament containing polyethylene terephthalate as a main component.
  • main component refers to a component that occupies 60 wt% or more of all components, and "containing polyethylene terephthalate as a main component” indicates that polyethylene terephthalate is contained at 60 wt% or more with respect to the resin components constituting the monofilament.
  • the polyester monofilament for a screen mesh cloth of the present invention has a transmittance of 30% or more when irradiated with a wavelength of 405 nm for a monofilament wound uniformly in a certain direction at a density of 0.018 g/cm 2 on a transparent acrylic plate having a thickness of 2 mm.
  • FIG. 1 is a schematic view for illustrating a sample preparation method when measuring a transmittance of the polyester monofilament for a screen mesh cloth of the present invention.
  • a transparent acrylic plate 1 having a thickness of 2 mm is placed in an aligned winding evaluation device 2, and the transparent acrylic plate 1 is rotated while being traversed.
  • the monofilament Y that has been unwound and run through a nip roll 4, a tensor 5, a direction change roll 6, and a yarn path regulation guide 7 are wound around the transparent acrylic plate 1 uniformly in a certain direction at a density of 0.018 g/cm 2 via an unwinding guide 3, thereby producing a plate-wound sample 8.
  • the transmittance T1 of the plate-wound sample 8 for a wavelength of 405 nm of the laser used for emulsion curing is measured.
  • T 2 % T 1 + 100 ⁇ T 0
  • the polyester monofilament for a screen mesh cloth used in direct digital platemaking has a transmittance of 30% or more for a wavelength of 405 nm.
  • the emulsion curing time can be shortened when irradiated with the laser required for emulsion curing, and screen printing with high accuracy can be performed in a short time.
  • the transmittance is lower than 30%, emulsion curing is insufficient in a short time, and printing cannot be performed in a designed pattern in some cases.
  • a more preferable transmittance of the monofilament when irradiated with a wavelength of 405 nm is 35% or more.
  • the upper limit of the transmittance is not particularly limited, but the transmittance is preferably 80% or less, and more preferably 70% or less, from the viewpoint of higher order passability in the weaving process.
  • a monofilament having a high transmittance at a wavelength of 405 nm for example, it is preferable to use a bright polyester in which the content of titanium oxide contained in the polyester is reduced.
  • a bright polyester in which the content of titanium oxide contained in the polyester is reduced.
  • the content of titanium oxide commonly known as a matting agent, and the content of titanium oxide is preferably 0.030 wt% or less, more preferably 0.027 wt% or less.
  • the polyester monofilament for a screen mesh cloth of the present invention is formed of a polyethylene terephthalate which contains terephthalic acid as a main acid component and ethylene glycol as a main glycol component and 90 mol% or more of which is composed of a repeating unit of ethylene terephthalate.
  • the polyester monofilament may include a copolymerization component capable of forming another ester bond at a ratio of less than 10 mol%, as long as the transmittance at a wavelength of 405 nm, which is a feature of the present invention, is not inhibited.
  • a metal catalyst, an inorganic particle, a lubricant, an antioxidant, a flame retardant, an antistatic agent, or the like can be added to the polyethylene terephthalate as necessary within a range that does not impair the transmittance which is a feature of the present invention.
  • the intrinsic viscosity of the yarn in the polyester monofilament for a screen mesh cloth of the present invention is preferably 0.60 to 0.90, and more preferably 0.60 to 0.82, from a viewpoint of the strength and the yarn production stability of the obtained monofilaments.
  • the cross-sectional form of the yarn in the polyester monofilament for a screen mesh cloth of the present invention can be either a single component or a core-sheath composite.
  • the monofilament is preferably a single component yarn.
  • the polyester monofilament for a screen mesh cloth of the present invention has a breaking strength of 4.3 cN/dtex to 9.0 cN/dtex and a breaking elongation of 11.0% to 50.0%.
  • the breaking strength is 9.0 cN/dtex or less and the breaking elongation is 11.0% or more, preferably the breaking strength is 6.2 cN/dtex or less and breaking elongation is 25.0% or more.
  • the breaking strength is set to 4.3 cN/dtex or more and the breaking elongation of 50.0% or less.
  • the polyester monofilament for a screen mesh cloth of the present invention has a 10% modulus of 2.5 cN/dtex to 9.0 cN/dtex.
  • the 10% modulus is too low, the cloth stability may not be obtained, and the printing accuracy may be lowered.
  • the 10% modulus is too high, the surface of the fiber becomes highly oriented, and it may be difficult to inhibit fluffing defects and scum defects that occur during weaving. Therefore, the 10% modulus is from 2.5 cN/dtex to 9.0 cN/dtex and the preferred 10% modulus is from 2.8 cN/dtex to 5.0 cN/dtex.
  • the single fiber fineness of the polyester monofilament for a screen mesh cloth of the present invention is preferably 65.0 dtex or less from the needs for screen mesh cloth use, and preferably 4.0 dtex or more from a standpoint of the yarn production property. More preferably, the single fiber fineness thereof is from 8.0 dtex to 62.0 dtex.
  • the boiling water shrinkage rate of the polyester monofilament for a screen mesh cloth of the present invention is preferably 5.0% to 12.0%.
  • the boiling water shrinkage rate is preferably 5.0% or more.
  • the boiling water shrinkage rate is within 12.0%, dimensional stability during heat setting can be obtained, and therefore the boiling water shrinkage rate is preferably within 12.0%. More preferably, the boiling water shrinkage rate is 6.0% to 10.0%.
  • the dynamic friction coefficient between the raw yarn and the satin metal (hereinafter, also referred to as the dynamic friction coefficient between the raw yarn and the satin metal) in the polyester monofilament for a screen mesh cloth of the present invention is preferably 0.100 to 0.170.
  • the satin metal is a metal having fine unevenness on the surface, and in the present invention, the dynamic friction coefficient between the original yarn and the satin metal having a surface roughness of 6S is measured.
  • the dynamic friction coefficient between the raw yarn and the satin metal is preferably 0.170 or less.
  • the dynamic friction coefficient between the raw yarn and the satin metal is 0.100 or more, it is possible to inhibit a decrease in the process passability due to insufficient tension in the yarn production process and the weaving process. Therefore, the dynamic friction coefficient between the raw yarn and the satin metal is preferably 0.100 or more. More preferably, the dynamic friction coefficient between the raw yarn and the satin metal is 0.130 or more.
  • an oil adhesion amount of the drawn yarn in the polyester monofilament for a screen mesh cloth of the present invention is preferably 0.10 wt% to 0.70 wt%.
  • the oil adhesion amount is preferably 0.10 wt% to 0.70 wt%, and more preferably 0.10 wt% to 0.50 wt%.
  • the spinning method of the polyester monofilament of the present invention is not particularly limited, and common techniques can be used. For example, after the polyethylene terephthalate is subjected to melt extrusion and the polyethylene terephthalate is filtered in a predetermined spinning pack, the yarn discharged from a spinneret is solidified by cooling air, and after an oil agent is applied by an oil feed roll, the yarn is taken up via a godet roll to obtain an undrawn yarn.
  • the undrawn yarn may be processed in a two-step method in which the undrawn yarn is wound once and then drawn by a drawing machine, or may be processed in a one-step method (direct spinning drawing method) in which the undrawn yarn is continuously drawn without once winding.
  • the fiber discharged from the spinneret may be passed through a heat-insulating cylinder that has been actively heated.
  • a fatty acid alkyl ester-based smoothing agent is preferably contained in an amount of 45 wt% to 65 wt%, more preferably 50 wt% to 60 wt% from the viewpoint of higher order passability.
  • a fatty acid alkyl ester-based smoothing agent is preferably contained in an amount of 45 wt% to 65 wt%, more preferably 50 wt% to 60 wt% from the viewpoint of higher order passability.
  • the dynamic friction coefficient between the raw yarn and the satin metal increases, and it is difficult to inhibit fluffing defects and scum defects caused by abrasion resistance with the reed in weaving only by adding the fatty acid alkyl ester-based smoothing agent.
  • the dynamic friction coefficient between the raw yarn and the satin metal can be reduced.
  • 6 wt% or more of the modified silicone product it is possible to reduce the dynamic friction coefficient between the raw yarn and the satin metal in the bright polyester monofilament such that the bright polyester monofilament can withstand the abrasion resistance with the reed in the weaving.
  • the content of the modified silicone product exceeds 8 wt%, the dynamic friction coefficient between the raw yarn and the satin metal may not be reduced further, and the effect of reducing the dynamic friction coefficient between the raw yarn and the satin metal may not be obtained anymore.
  • the content of the modified silicone product is 8 wt% or less, it is possible to inhibit destabilization of an oil film on an oil feed roller due to a decrease in surface tension and a decrease in uniform adhesion of an oil agent, and thus fluffing and scum defects can be prevented.
  • the content of the modified silicone product contained in the emulsion is preferably 6 wt% to 8 wt%, more preferably 7 wt% to 8 wt%, in terms of the oil component concentration excluding moisture.
  • Antistatic agents such as alkyl sulfonate, extreme pressure agents such as alkyl phosphate, oil film reinforcing agents, emulsifiers, pH adjusters, preservatives or the like may be added to the oil agent applied to the polyester monofilament of the present invention as long as the smoothness is not impaired.
  • the emulsion concentration of the oil agent applied to the polyester monofilament of the present invention is preferably 2 wt% to 12 wt%, more preferably 2 wt% to 10 wt%, from the viewpoint of the scattering of the oil and the stability of the oil film on the oil feed roller.
  • the spinning speed of the polyester monofilament of the present invention is preferably 500 m/min to 1,300 m/min.
  • the speed of the godet roll is 500 m/min or more, it is possible to stabilize the runnability of the yarn, and in the case where the speed of the godet roll is 1,300 m/min or less, it is possible to inhibit the fiber surface orientation before drawing from being promoted and reduce fluffing and scum defects caused as a result thereof.
  • a more preferred spinning speed is 700 m/min to 1,200 m/min.
  • the method of drawing the polyester monofilament of the present invention is not particularly limited, and may be based on a common technique, for example, after one-stage heating drawing between a first hot roll and a second hot roll, the yarn is wound through a cold godet roll to obtain a drawn yarn.
  • a two-stage heating drawing method may be employed in which the first-stage heating drawing is performed between the first hot roll and the second hot roll, and the second-stage heating drawing is performed between the second hot roll and a third hot roll.
  • the temperature of the first hot roll is preferably within a range of from the glass transition temperature +10°C to the glass transition temperature +30°C of the polyester as the core component
  • the temperature of the second hot roll is preferably within a range of 130°C to 200°C in a case of the first-stage heating drawing.
  • the fiber orientation can be controlled to promote crystallization of the fiber, thereby increasing the strength of the yarn.
  • the temperature of the second hot roll is 200°C or lower, not only the yarn production property is good but also whitening of the yarn due to the promotion of excessive crystallization can be inhibited.
  • a more preferred temperature of the second hot roll is 130°C to 150°C.
  • the draw ratio of the polyester monofilament of the present invention is preferably 3.0 times or more in total in order to obtain a target yarn having a high strength and a high modulus.
  • the draw ratio is preferably 6.0 times or less in total.
  • a more preferable total draw ratio is 3.5 to 5.0 times.
  • the filament can be wound at the same speed between the final hot roll and the cold godet roll, or a relaxing treatment for setting a speed difference between the two rolls can be performed for the purpose of preventing orientation of an amorphous portion.
  • the woven mesh fabric produced using the polyester monofilament of the present invention can be suitably used for direct digital platemaking.
  • the polyester monofilament of the present invention is preferably disposed in at least a part of at least one of a warp and a weft of the woven mesh fabric, and it is more preferable that at least one of the warp and the weft of the woven mesh fabric is formed of the polyester monofilament of the present invention, and it is particularly preferable that both the warp and the weft be formed by the polyester monofilament of the present invention.
  • a transparent acrylic plate 1 having a thickness of 2 mm (manufactured by MISUMI Group Inc.: Model ACSH series) was placed in an aligned winding evaluation device 2 manufactured by EIKO Industrial Co., Ltd.
  • the transparent acrylic plate 1 was rotated at 550 rpm while being traversed, and a monofilament Y that had been run through a nip roll 4, a tensor 5, direction change rolls 6, and a yarn path regulation guide 7 by applying a tension of 10 g was wound around the transparent acrylic plate 1 for four rounds (eight layers) uniformly in a certain direction at a density of 0.018 g/cm 2 via an unwinding guide 3 to obtain a plate-wound sample 8.
  • the number of rounds in winding a yarn on the traverse-moved transparent acrylic plate 1 was determined by the fineness (fiber diameter) of the yarn, and was four rounds (eight layers) in the case of 32 dtex (54 ⁇ m).
  • the number of rounds was adjusted such that the density of the wound sample was the same. For example, the number of rounds is eight (16 layers) for 8 dtex (27 ⁇ m), five (10 layers) for 20 dtex (43 ⁇ m), and nine (18 layers) for 6 dtex (24 ⁇ m).
  • the plate-wound sample 8 of the monofilament was placed in a spectrophotometer (Model SPECTROPHOTOMETER CM-3700d) manufactured by Konica Minolta Co., Ltd., and then the transmittance T1 of the plate-wound sample 8 at 405 nm, which is the wavelength of the laser used for emulsion curing, was measured.
  • the transparent acrylic plate 1 alone exhibits a certain absorption at a wavelength of 405 nm
  • T2 T 1 + 100 ⁇ T 0
  • one woven mesh fabric was placed in a spectrophotometer in the same manner as described above without a transparent acrylic plate, and then a transmittance T3 at a wavelength of 405 nm was measured.
  • the intrinsic viscosity (IV) of the yarn in the polyester monofilament was calculated according to the following formula (2).
  • the relative viscosity ⁇ r in the formula (2) was obtained by the following formula (3) by dissolving 0.8 g of a sample in 10 mL of o-chlorophenol (hereinafter abbreviated as OCP) having a purity of 98% or more at 25°C and using an Ostwald viscometer at a temperature of 25°C.
  • OCP o-chlorophenol
  • Glass transition temperature Tg (°C) was determined as follows: 10 mg of a powder of the polyester to be used was collected; the temperature was raised at 16 °C/min with a differential scanning calorimeter (PerkinElmer Co., Ltd.: DSC-4 type), and the peak associated with the glass transition developed in the temperature rise process was processed with a data processing system manufactured by PerkinElmer Co., Ltd.
  • a Tensilon tensile tester manufactured by ORIENTEC Co., Ltd. was used to measure the strength, elongation, and modulus at 10% elongation at break at an initial sample length of 20 cm and a tensile speed of 2 cm/min were measured, and the average value of the values measured three times was determined as the strength (cN/dtex), elongation (%), and 10% modulus (cN/dtex), respectively.
  • the fineness of the monofilament was skeined by 500 m, and the value obtained by multiplying the mass of the skein by 20 was taken as the fineness.
  • a monofilament was skeined using a measuring machine having a frame circumference of 100 cm to prepare a skein having 10 turns.
  • a constant load was applied to the obtained skein, and the initial skein length L0 (mm) was measured.
  • the weight was removed, immersed in warm water at 100°C for 15 minutes, dried for 30 minutes or more, and then subjected to a constant load to measure a skein length L1 (mm) after shrinkage, and the boiling water shrinkage rate (%) was calculated according to the following formula (4).
  • Boiling water shrinkage rate L 0 ⁇ L 1 / L 0 ⁇ 100
  • the load (g) applied during measurement of the initial skein length and the skein length after shrinkage was set according to the following formula (5) based on the total fineness T (dtex) of the yarn.
  • Load T ⁇ 0.9 ⁇ 1 / 30 ⁇ 20
  • a fineness variation chart (Diagram Mass) was obtained under the following measurement conditions using a Uster Tester UT-4CX manufactured by Zellweger Co., Ltd. without using a twister, and simultaneously, an average deviation rate (U%) was measured in the normal mode.
  • a screen mesh cloth having a width of 2.2 m and a length of 300 m was woven by a loom made by Sulzer at a loom rotation speed of 200 rotations/min.
  • the obtained screen mesh cloth was caused to run at a speed of 2 m/min, a skilled inspection technician visually inspected the fluff and scum according to the inspection rules for a screen mesh cloth, and comprehensively evaluated the fluffing and scum based on the following four grades.
  • the pass levels are A and B.
  • the printing evaluation was performed by direct digital platemaking using the screen mesh cloth. That is, the photosensitive emulsion was applied to the screen mesh cloth obtained in (9) and then was irradiated with a 405 nm laser for 40 seconds to form a 50 ⁇ m line pattern at intervals of 50 ⁇ m. After that, the line accuracy and the distortion of the printing pattern due to dimensional stability in printing 1000 sheets were observed, and comprehensively evaluated based on the following four grades.
  • the pass levels are A, B, and C.
  • the line boundary may be uneven, but dimensional stability is good
  • the pipe passage time of the polymer was 30 minutes, and the pressure applied to the spinneret was 10 MPa. Thereafter, the yarn discharged from the spinneret was spun using a spinning device equipped with the equipment as shown in FIG. 3 .
  • the polyester monofilament discharged from the spinneret 15 was cooled by applying a cooling air of 20 m/min by a yarn cooling air blowing device 16, an oil agent having an emulsion concentration of 4 wt% was applied by an oil feed roll 17, and then was taken up by a non-heated godet roll 18 at a speed of 900 m/min, thereby obtaining an undrawn yarn package 19.
  • the oil agent applied to the undrawn yarn contains 54 wt% of a fatty acid alkyl ester and 7 wt% of a modified silicone product as a smoothing agent, an alkyl phosphate as an extreme pressure agent, an alkyl sulfonate as an antistatic agent, a nonionic ester and a nonionic ether as an emulsifier.
  • the undrawn yarn package 19 was used to perform drawing using a drawing device equipped with the equipment as shown in FIG. 4 . That is, the yarn passed through a feed roll 20 was taken over by a first hot roll 21 heated to a temperature of 91°C at a speed of 174 m/min and by a second hot roll 22 heated to a temperature of 130°C at a speed of 710 m/min, so that drawing at a draw ratio of 4.1 and the heat setting were performed.
  • the drawn yarn was taken over by a cold godet roll 23 at a speed of 710 m/min, and then wound while the spindle rotational speed was controlled so as to obtain a drawn yarn package 24 of a polyester monofilament of 31.8 dtex (fiber diameter 54 ⁇ m).
  • the obtained polyester monofilament had a breaking strength of 4.7 cN/dtex, a breaking elongation of 44.5%, a 10% modulus of 3.0 cN/dtex, a titanium oxide amount of 0.025 wt%, and other physical properties are as shown in Table 1.
  • the obtained 31.8 dtex (54 ⁇ m) polyester monofilament was wound on a transparent acrylic plate for four rounds (eight layers) and irradiated with a wavelength of 405 nm, the transmittance was 39%.
  • Table 1 shows the evaluation results of the quality of the screen mesh cloth based on fluffing and scum defects when the obtained polyester monofilament was woven with a mesh number #120 and the printing evaluation results based on the line accuracy and the dimensional stability when irradiated with 405 nm laser for 40 seconds.
  • the quality of the screen mesh cloth was very good as the fluffing and scum defects w 0 to 1 per 30 m in length.
  • the transmittance was 82%.
  • the line accuracy was extremely good, good results were obtained for dimensional stability, and overall excellent printing accuracy was obtained.
  • a polyester monofilament of 32.0 dtex was obtained in the same manner as in Example 1 except that the titanium oxide content was changed to 0.001 wt%.
  • the titanium oxide amount of the obtained polyester monofilament is 0.001 wt%, and the other physical properties are as shown in Table 1.
  • the transmittance when irradiated with a wavelength of 405 nm was as high as 46%, which was higher than that of Example 1, because of the decrease in the titanium oxide content.
  • the dynamic friction coefficient between the raw yarn and the satin metal was slightly higher than that in Example 1.
  • the screen mesh cloth quality the fluffing and scum defects were the same as those in Example 1, and the results were extremely good.
  • the transmittance was 86%.
  • the line accuracy and the dimensional stability were the same as those in Example 1, and excellent printing accuracy was obtained.
  • a polyester monofilament of 32.5 dtex was obtained in the same manner as in Example 1 except that the transmittance when irradiated with a wavelength of 405 nm was set to 18% by changing the titanium oxide content to 0.500 wt%.
  • the titanium oxide amount of the obtained polyester monofilament is 0.500 wt%, and the other properties are as shown in Table 1. Since the titanium oxide content was increased, the dynamic friction coefficient between the raw yarn and the satin metal was lower than that in Example 1, but the transmittance when irradiated with a wavelength of 405 nm was significantly reduced to 18%. As for the screen mesh cloth quality, the result was extremely good as in Example 1. On the other hand, the transmittance when the woven mesh fabric was irradiated with a wavelength of 405 nm was 68%. As the printing evaluation results, since the time for emulsion curing was insufficient, unevenness occurred at the line boundary, and the printing accuracy was significantly inferior to that in Example 1 from the viewpoint of line accuracy.
  • a polyester monofilament of 32.4 dtex was obtained in the same manner as in Example 1 except that the intrinsic viscosity was changed.
  • the obtained polyester monofilament had an intrinsic viscosity of 0.77, a breaking strength of 5.5 cN/dtex, a breaking elongation of 32.4%, and a 10% modulus of 3.9 cN/dtex.
  • the other physical properties were as shown in Table 1, by increasing the IV as compared with Example 1, the stress applied to the yarn during spinning and drawing was increased, and a yarn with the high strength, low elongation, and high modulus was obtained.
  • the screen mesh cloth quality the result was extremely good as in Example 1.
  • the line accuracy was extremely good, and because of the high strength and low elongation, the dimensional stability was improved as compared with Example 1, and the printing accuracy was extremely good.
  • a polyester monofilament of 31.1 dtex was obtained in the same manner as in Example 1 except that the intrinsic viscosity was changed.
  • the obtained polyester monofilament had an intrinsic viscosity of 0.92, a breaking strength of 6.3 cN/dtex, a breaking elongation of 21.3%, and a 10% modulus of 5.1 cN/dtex.
  • the other physical properties were as shown in Table 2, and as in Example 3, a yarn with a high strength, a low elongation, and a high modulus was obtained by increasing IV as compared with Example 1.
  • the result was extremely good as in Example 1.
  • a polyester monofilament of 33.0 dtex was obtained in the same manner as in Example 1 except that the intrinsic viscosity was changed.
  • the obtained polyester monofilament had an intrinsic viscosity of 0.55, a breaking strength of 4.2 cN/dtex, a breaking elongation of 52.4%, and a 10% modulus of 2.3 cN/dtex.
  • the other physical properties were as shown in Table 2, and a yarn having a low strength, a high elongation, and a low modulus was obtained by lowering the IV as compared with Example 1.
  • the screen mesh cloth quality the result was extremely good as in Example 1.
  • the cloth tensioning stability was lowered, and the line accuracy was lowered as compared with Example 1.
  • the dimensional stability was also greatly lowered from the occurrence of the cloth elongation due to the low strength and high elongation, and the printing accuracy was significantly inferior to that in Example 1.
  • a polyester monofilament of 33.0 dtex was obtained in the same manner as in Example 1 except that the spinning speed (the speed of the spinning godet roll) was changed.
  • the obtained polyester monofilament had a breaking strength of 6.0 cN/dtex, a breaking elongation of 26.5%, a 10% modulus of 4.7 cN/dtex, and other physical properties as shown in Table 2.
  • the spinning speed was high, the orientation of the fiber surface was increased, fluffing defects and scum defects in the weaving process were slightly increased as compared with Example 1, and the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use.
  • the line accuracy was extremely good, and because of the high strength and low elongation, the dimensional stability was improved as compared with Example 1, and the printing accuracy was extremely good.
  • a polyester monofilament of 32.7 dtex was obtained in the same manner as in Example 1 except that the content of the fatty acid alkyl ester in the oil agent was changed.
  • the physical properties of the obtained polyester monofilament were as shown in Table 2, and the dynamic friction coefficient between the raw yarn and the satin metal was 0.190, which was higher than that in Example 1. Because of the higher friction than in Example 1, fluffing defects and scum defects were slightly increased in the weaving process, and the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use. As the printing evaluation results, both the line accuracy and the dimensional stability were the same as those in Example 1, and excellent printing accuracy was obtained.
  • Example 4 Comparative Example 2
  • Example 5 Example 6 kind of Polyester PET PET PET PET Yarn production Process Two-step Method Two-step Method Two-step Method Drawing Method One-stage Drawing One-stage Drawing One-stage Drawing One-stage Drawing Cross-sectional Form of Yarn Single Component Single Component Single Component Single Component Oil Emulsion Content of Fatty Acid Alkyl Ester wt% 54 54 54 43 Content of Modified silicone product wt% 7 7 7 7 Emulsion Concentration wt% 4 4 4 4 Spinning Godet Roll Speed m/min 900 900 1320 900 First Hot Roll Temperature °C 91 91 91 Speed m/min 174 174 174 Second hot roll Temperature °C 130 130 130 130 Speed m/min 710 710 710 710 Drawing Cold Godet Roll Speed m/min 710 710 710 710 Draw ratio Times 4.1 4.1 4.1 4.1 Titanium Oxide Content of Ya
  • a polyester monofilament of 32.1 dtex was obtained in the same manner as in Example 1 except that the content of the modified silicone product in the oil agent was changed to 2 wt%.
  • the physical properties of the obtained polyester monofilament were as shown in Table 3, and the dynamic friction coefficient between the raw yarn and the satin metal was 0.203, which was higher than that of Example 1. Because of the higher friction than in Example 1, fluffing defects and scum defects were slightly increased in the weaving process, and the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use. As the printing evaluation results, the line accuracy was slightly inferior to that in Example 1 since partial fluffing and printing defects occurred. The dimensional stability was good as in Example 1, and the overall printing accuracy was slightly inferior to that in Example 1, but generally excellent printing accuracy was obtained.
  • a polyester monofilament of 33.0 dtex was obtained in the same manner as in Example 1 except that the content of the modified silicone product in the oil agent was changed to 5 wt%.
  • the physical properties of the obtained polyester monofilament were as shown in Table 3, and the dynamic friction coefficient between the raw yarn and the satin metal was 0.184, which was higher than that of Example 1. Because of the higher friction than in Example 1, fluffing defects and scum defects were slightly increased in the weaving process, and the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use. As the printing evaluation results, both the line accuracy and the dimensional stability were the same as those in Example 1, and excellent printing accuracy was obtained.
  • a polyester monofilament of 33.1 dtex was obtained in the same manner as in Example 1 except that the content of the modified silicone product in the oil agent was changed to 9 wt%.
  • the physical properties of the obtained polyester monofilament were as shown in Table 3, and the dynamic friction coefficient between the raw yarn and the satin metal was 0.160, which was equivalent to that in Example 1.
  • the oil film cracking on the oil feed roll occurred in the yarn production process.
  • non-uniform adhesion of oil to the yarn was considered to have occurred, and fluffing defects and scum defects increased slightly during the weaving process, and the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use.
  • both the line accuracy and the dimensional stability were the same as those in Example 1, and excellent printing accuracy was obtained.
  • a polyester monofilament of 32.9 dtex was obtained in the same manner as in Example 1 except that the oil adhesion amount of the drawn yarn was changed to 0.35 wt%.
  • the physical properties of the obtained polyester monofilament were as shown in Table 3.
  • the screen mesh cloth quality the fluffing and scum defects were the same as those in Example 1, and the result was extremely good.
  • the line accuracy and the dimensional stability were the same as those in Example 1, and excellent printing accuracy was obtained.
  • Example 7 Example 8
  • Example 9 Example 10 kind of Polyester PET PET PET PET Yarn production Process Two-step Method Two-step Method Two-step Method Drawing Method One-stage Drawing One-stage Drawing One-stage Drawing One-stage Drawing Cross-sectional Form of Yarn Single Component Single Component Single Component Single Component Oil Emulsion Content of Fatty Acid Alkyl Ester wt% 54 54 54 54 Content of Modified silicone product wt% 2 5 9 7 Emulsion Concentration wt% 4 4 4 4 Spinning Godet Roll Speed m/min 900 900 900 900 900 First Hot Roll Temperature °C 91 91 91 Speed m/min 174 174 Second hot roll Temperature °C 130 130 130 130 Speed m/min 710 710 710 710 Drawing Cold Godet Roll Speed m/min 710 710 710 710 Draw ratio Times 4.1 4.1 4.1 4.1 Titanium Oxide Content of Yarn wt%
  • a polyester monofilament of 33.1 dtex was obtained in the same manner as in Example 1 except that the oil adhesion amount of the drawn yarn was changed to 0.07 wt%.
  • the physical properties of the obtained polyester monofilament were as shown in Table 4, and the dynamic friction coefficient between the raw yarn and the satin metal was 0.191, which was higher than that in Example 1. Because of the higher friction than in Example 1, fluffing defects and scum defects were slightly increased in the weaving process, and the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use. As the printing evaluation results, the line accuracy was slightly inferior to that in Example 1 since partial fluffing and printing defects occurred. The dimensional stability was good as in Example 1, and the overall printing accuracy was slightly inferior to that in Example 1, but generally excellent printing accuracy was obtained.
  • a polyester monofilament of 32.1 dtex was obtained in the same manner as in Example 1 except that the oil adhesion amount of the drawn yarn was changed to 0.75 wt%.
  • the physical properties of the obtained polyester monofilament were as shown in Table 4, by increasing the oil adhesion amount of the drawn yarn as compared with Example 1, the oil was dropped in the weaving process and scum defects were generated, and the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use.
  • the line accuracy was slightly inferior to that in Example 1 since scum was partially mixed in the woven fabric and printing defects were generated.
  • the dimensional stability was good as in Example 1, and the overall printing accuracy was slightly inferior to that in Example 1, but generally excellent printing accuracy was obtained.
  • a polyester monofilament of 32.1 dtex was obtained in the same manner as in Example 1 except that the temperature of the first hot roll was changed in the drawing step.
  • the physical properties of the obtained polyester monofilament were as shown in Table 4. As for the screen mesh cloth quality, the result was extremely good as in Example 1. As the printing evaluation results, since the preheating for drawing was insufficient, the Uster unevenness U% (N) was slightly worse as compared with Example 1, resulting in inferior fiber diameter uniformity, so that the line accuracy was slightly inferior to that in Example 1. The dimensional stability was as good as in Example 1, and the overall printing accuracy was slightly inferior to that in Example 1, but generally excellent printing accuracy was obtained.
  • a polyester monofilament of 31.8 dtex was obtained in the same manner as in Example 1 except that the speed of the first hot roll was changed and the draw ratio was changed to 4.7 times in the drawing process.
  • the obtained polyester monofilament had a breaking strength of 5.5 cN/dtex, a breaking elongation of 30.0%, a 10% modulus of 4.3 cN/dtex, and other physical properties as shown in Table 4.
  • the fiber surface orientation was increased due to a high draw ratio, and the number of fluffing defects and the number of scum defects were slightly increased in the weaving process.
  • the screen mesh cloth quality was slightly inferior to that in Example 1, but not problematic in practical use.
  • the line accuracy and the dimensional stability were the same as those in Example 1, and excellent printing accuracy was obtained.
  • Example 11 Example 12
  • Example 13 Example 14
  • Example 14 Kind of Polyester PET PET PET PET Yarn production Process Two-step Method Two-step Method Two-step Method Drawing Method One-stage Drawing One-stage Drawing One-stage Drawing One-stage Drawing Cross-sectional Form of Yarn Single Component Single Component Single Component Single Component Oil Emulsion Content of Fatty Acid Alkyl Ester wt% 54 54 54 54 Content of Modified silicone product wt% 7 7 7 7 7 Emulsion Concentration wt% 4 4 4 4 Spinning Godet Roll Speed m/min 900 900 900 900 900 First Hot Roll Temperature °C 91 91 75 91 Speed m/min 174 174 150 Second hot roll Temperature °C 130 130 130 Speed m/min 710 710 710 Drawing Cold Godet Roll Speed m/min 710 710 710 710 Draw ratio Times 4.1 4.1 4.7 Titanium Oxide Content of Yarn wt% 0.025
  • a polyester monofilament of 20.0 dtex (fiber diameter of 43 ⁇ m) was obtained in the same manner as in Example 1 except that the draw ratio was changed to 4.3 times by changing the first hot roll speed and the target fineness was changed by changing the discharge amount.
  • the obtained polyester monofilament had a breaking strength of 5.6 cN/dtex, a breaking elongation of 32.5%, a 10% modulus of 4.1 cN/dtex, and other physical properties as shown in Table 5.
  • the polyester monofilament of 20.0 dtex (43 ⁇ m) was wound around a transparent acrylic plate for five rounds (10 layers) so as to have a density equivalent to that of a plate-wound sample obtained by winding a filament of 32 dtex (54 ⁇ m) for four rounds (8 layers), and the transmittance when irradiated with a wavelength of 405 nm was 37%.
  • Example 1 In order to make the strength of the screen mesh cloth equal to that in Example 1, the obtained polyester monofilament was woven with a mesh number #220, and the cloth quality and the printing accuracy were evaluated. As for the screen mesh cloth quality, the result was extremely good as in Example 1. As the printing evaluation results, the line accuracy was extremely good, and in addition, the dimensional stability was improved due to the high strength and high modulus as compared with Example 1, and the printing accuracy was extremely good.
  • a polyester monofilament of 8.0 dtex (fiber diameter of 27 ⁇ m) was obtained in the same manner as in Example 1 except that the draw ratio was changed to 4.3 times by changing the first hot roll speed and the target fineness was changed by changing the discharge amount.
  • the obtained polyester monofilament had a breaking strength of 5.4 cN/dtex, a breaking elongation of 37.0%, a 10% modulus of 3.8 cN/dtex, and other physical properties as shown in Table 5.
  • a polyester monofilament of 8.0 dtex (27 ⁇ m) was wound around a transparent acrylic plate for eight rounds (16 layers) so as to have a density equivalent to that of a plate-wound sample obtained by winding a filament of 32 dtex (54 ⁇ m) for four rounds (8 layers), and the transmittance when irradiated with a wavelength of 405 nm was 38%.
  • Example 1 In order to make the strength of the screen mesh cloth equal to that in Example 1, the obtained polyester monofilament was woven with a mesh number #380, and the cloth quality and the printing accuracy were evaluated. As for the screen mesh cloth quality, the result was extremely good as in Example 1. As the printing evaluation results, the line accuracy was extremely good, and in addition, the dimensional stability was improved because of the high strength and high modulus as compared with Example 1, and the printing accuracy was extremely good.
  • Example 15 Example 16 kind of Polyester PET PET Yarn production Process Two-step Method Two-step Method Drawing Method One-stage Drawing One-stage Drawing Cross-sectional Form of Yarn Single Component Single Component Oil Emulsion Content of Fatty Acid Alkyl Ester wt% 54 54 Content of Modified silicone product wt% 7 7 Emulsion Concentration wt% 4 4 Spinning Godet Roll Speed m/min 900 900 First Hot Roll Temperature °C 91 91 Speed m/min 165 165 Second hot roll Temperature °C 130 130 Speed m/min 710 710 Drawing Cold Godet Roll Speed m/min 710 710 Draw ratio Times 4.3 4.3 Titanium Oxide Content of Yarn wt% 0.025 0.025 Intrinsic Viscosity of Yarn - 0.72 0.71 Single Fiber Fineness dtex 20.0 8.0 Breaking Strength cN/dtex 5.6 5.4 Breaking Elongation % 32.5 37.0 10% Mod
  • a core-sheath composite polyester monofilament was produced by a one-step method (direct spinning and drawing method) using a yarn production device equipped with the equipment shown in FIG. 5 . That is, polyethylene terephthalate (glass transition temperature: 80°C) having a titanium oxide content of 0.025 wt% and an intrinsic viscosity of 1.00 as a high-viscosity polymer, and polyethylene terephthalate (glass transition temperature 80°C) having a titanium oxide content of 0.025 wt% and an intrinsic viscosity of 0.51 as a low-viscosity polymer were polymerized by a common method to form a chip.
  • the obtained two kinds of polyethylene terephthalate were melted at a temperature of 298°C using an extruder, weighed by a pump at a polymer temperature of 295°C, and flowed into a common composite spinneret 25 so that the high-viscosity polymer was arranged in the core component and the low-viscosity polymer was arranged in the sheath component at a core-sheath ratio of 80:20.
  • the pressure applied to the spinneret was 18 MPa for the core component, and the pipe passage time of the core component polymer was 10 minutes.
  • the polyester monofilament discharged from the composite spinneret 25 was actively heated and maintained warm by a heat-insulating cylinder 26 at 380°C, and then was cooled by applying cool air at a speed of 10 m/min by a yarn cooling blowing device 27.
  • the yarn was taken up by an non-heated spinning godet roll 29 at a speed of 500 m/min, and was, without being wound up once, taken up by a first hot roll 30 heated to a temperature of 91 °C at a speed of 505 m/min, a second hot roll 31 heated to a temperature of 91 °C at a speed of 2,092 m/min and a third hot roll 32 heated to a temperature of 200°C at a speed of 2,929 m/min, so that two-stage drawing at a draw ratio of 5.8 times and heat setting were performed.
  • the drawn yarn was wound while the spindle rotational speed was controlled such that the winding tension was 0.3 cN/dtex by a yarn winding device 35, thereby obtaining a drawn yarn package 36 of a core-sheath composite polyester monofilament of 6.0 dtex (fiber diameter of 24 ⁇ m).
  • the oil agent applied to the polyester monofilament contains 54 wt% of a fatty acid alkyl ester and 7 wt% of silicone modified product as a smoothing agent, an alkyl phosphate as an extreme pressure agent, an alkyl sulfonate as an antistatic agent, a nonionic ester and a nonionic ether as an emulsifier.
  • the obtained polyester monofilament had a breaking strength of 8.5 cN/dtex, a breaking elongation of 13.7%, a 10% modulus of 8.1 cN/dtex, a titanium oxide amount of 0.025 wt%, an intrinsic viscosity of 0.81, and other physical properties as shown in Table 6.
  • a polyester monofilament of 6.0 dtex (24 ⁇ m) was wound around a transparent acrylic plate for nine rounds (18 layers) such that the density was equivalent to that of a plate-wound sample in which a filament of 32 dtex (54 ⁇ m) was wound four rounds (eight layers), and was irradiated with the wavelength of 405 nm, the transmittance was 31%.
  • Table 6 shows the evaluation results of the screen mesh cloth quality due to fluffing and scum defects when the obtained polyester monofilament was woven with a mesh number #420 and the printing evaluation results based on the line accuracy and the dimensional stability.
  • the screen mesh cloth quality a low-viscosity polymer was arranged in the sheath component, but due to the high modulus, the fluffing and scum defects was 2 to 5 per 30 m in length, which was slightly inferior to that in Example 1, but there was no problem in practical use.
  • the printing evaluation results although the transmittance of the yarn was slightly lower than that in Example 1, the line accuracy was not affected and the cloth stability was improved, extremely good line accuracy was obtained as in Example 1. With respect to dimensional stability, extremely excellent dimensional stability was obtained due to the high strength and the low elongation, and overall excellent printing accuracy was obtained as compared with Example 1.
  • Example 17 a core-sheath composite polyester monofilament was produced by a one-step method (direct spinning drawing method). At this time, the speed of the spinning godet roll was changed to 475 m/min, the speed of the first hot roll was changed to 480 m/min, and the draw ratio was changed to 6.2. In addition, the temperature of the third hot roll was changed to 220°C, and the other manufacturing conditions were similar to Example 17, a core-sheath composite polyester monofilament of 6.0 dtex (fiber diameter of 24 ⁇ m) was obtained.
  • the physical properties of the polyester monofilament obtained were as follows: a breaking strength of 9.2 cN/dtex, a breaking elongation of 10.2%, a 10% modulus of 9.1 cN/dtex, a boiling water shrinkage rate of 4.8%, and a titanium oxide content of 0.025 wt%, and the other physical properties were as shown in Table 6.
  • Table 6 shows the evaluation results of the screen mesh cloth quality based on fluffing and scum defects when the obtained polyester monofilament was woven with a mesh number #420 and the printing evaluation results based on the line accuracy and the dimensional stability.
  • the drawing margin of the cloth was reduced by decreasing the low elongation, and the yarn breakage was increased.
  • the screen mesh cloth quality the number of fluffing and scum defects were 6 to 9 per 30 m in length because of the higher draw ratio and the higher modulus as compared with Example 17. The result was significantly inferior to that in Example 1.
  • Example 17 and Comparative Example 3 The results of Example 17 and Comparative Example 3 are shown in Table 6.
  • Example 17 Comparative Example 3 Kind of Polyester PET PET Yarn production Process One-step Method One-step Method Drawing Method Two-stage Drawing Two-stage Drawing Cross-sectional Form of Yarn Core-sheath Composite Core-sheath Composite Oil Emulsion Content of Fatty Acid Alkyl Ester wt% 54 54 Content of Modified silicone product wt% 7 7 Emulsion Concentration wt% 10 10 Spinning Godet Roll Speed m/min 500 475 First Hot Roll Temperature °C 91 91 Speed m/min 505 480 Second hot roll Temperature °C 91 91 Speed m/min 2092 2092 Third hot roll Temperature °C 200 220 Speed m/min 2929 2929 Drawing Cold Godet Roll Speed m/min 2929 2929 Draw ratio Times 5.8 6.2 Titanium Oxide Content of Yarn wt% 0.025 0.025 Intrinsic Viscosity of Yarn

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  • Textile Engineering (AREA)
  • Artificial Filaments (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Woven Fabrics (AREA)
EP19865767.8A 2018-09-27 2019-09-25 Monofilament de polyester pour tissu de tamis et tissu à mailles tissées pour la fabrication directe de plaques numériques Withdrawn EP3859057A4 (fr)

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