WO2020067224A1 - 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
WO2020067224A1
WO2020067224A1 PCT/JP2019/037722 JP2019037722W WO2020067224A1 WO 2020067224 A1 WO2020067224 A1 WO 2020067224A1 JP 2019037722 W JP2019037722 W JP 2019037722W WO 2020067224 A1 WO2020067224 A1 WO 2020067224A1
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Prior art keywords
polyester monofilament
yarn
dtex
printing
monofilament
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PCT/JP2019/037722
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English (en)
Japanese (ja)
Inventor
俊祐 向阪
恒 篠川
市川　智之
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東レ株式会社
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Priority to EP19865767.8A priority Critical patent/EP3859057A4/fr
Priority to JP2019569861A priority patent/JPWO2020067224A1/ja
Priority to CN201980063598.XA priority patent/CN112752873A/zh
Publication of WO2020067224A1 publication Critical patent/WO2020067224A1/fr

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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 a high mesh fabric for screen gauze use. More specifically, the present invention relates to a polyester monofilament for screen gauze suitable for direct digital plate making, a new high-definition printing technique, in which direct plate making and printing are performed by a digital process using a computer without using a positive film and a dyeing process is unnecessary. It is.
  • mesh fabrics made of natural fibers or inorganic fibers have been widely used as screen printing fabrics.
  • synthetic fabrics with excellent flexibility, durability and cost performance, especially mesh fabrics made of polyester are widely used for high-precision printing of graphic designs such as textile printing, nameplate printing, label printing of compact discs, etc. It is used in a wide range of applications, such as electronic board circuit printing.
  • electronic devices have become more sophisticated and more compact, circuit boards have become more precise and compact, and screen gauze is strongly required to have high printing accuracy.
  • a negative is prepared by removing the non-solidified portion of the photosensitive emulsion, a coating material is filled in the plate frame, and then a coating agent is applied to the subject by squeezing to perform printing.
  • the most important step from the viewpoint of printing accuracy is the step of aligning the positive film and the printing plate. While the alignment of the two is directly linked to the printing accuracy, the alignment work largely depends on the experience, knowledge, and feeling of the operator, and the variation is likely to occur due to large artificial factors.
  • Direct digital plate making is a plate making / printing technique in which a printing pattern is digitized by a computer, a photosensitive emulsion on a plate making surface is processed by a laser with an optical output, and a pattern is formed on the printing plate by direct exposure. Since a print pattern is formed directly by a computer, a positive film is not required, 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 Literature 1 and Patent Literature 2 which are general monofilaments for screen gauze, titanium oxide, which is also known as a matting agent, is contained, and the screen gauze is dyed yellow in a dyeing process to prevent halation. doing.
  • the polymer itself contains a chemical substance that prevents halation.
  • Patent Document 3 proposes a soaked monofilament in which an organic compound-based yellow pigment is contained in a polymer.
  • an antihalation effect is improved by adding an ultraviolet absorber to a polymer, dyeing a screen gauze yellow, and performing exposure and hardening of a photosensitive emulsion.
  • titanium oxide is contained as described above, and the screen gauze is dyed yellow in the dyeing step.
  • titanium oxide or a dye hinders the transmission of the laser, so that it is difficult to say that it is suitable for direct digital plate making.
  • an organic compound pigment is contained in addition to titanium oxide, it is hard to say that it is suitable for direct digital plate making from the viewpoint that laser transmission is also hindered.
  • Patent Document 4 in addition to the yellow dye hindering the transmission of laser light, the strength and modulus of the screen gauze decrease due to shrinkage during dyeing, and the dimensional stability and printing accuracy of the screen gauze decrease. . Therefore, in direct digital plate making in which the color of the screen gauze is not restricted, it is hardly suitable.
  • the multifilament for clothing described in Patent Document 5 has a reduced titanium oxide content in order to improve transparency and aesthetics, but screen gauze has higher quality requirements than fabrics for clothing. Even if the technique described in No. 5 is applied to a monofilament for screen gauze, the technique cannot withstand abrasion resistance with a reed in weaving. In other words, since the content of metal particles that form minute irregularities on the fiber surface, such as titanium oxide, is small, the friction coefficient between the original yarn and the metal increases, and it is obvious that printing defects such as fluffing and scum in weaving occur. is there. Further, multifilaments are not preferable as raw yarns for screen gauze, because multifilaments are inferior in fiber diameter uniformity to monofilaments.
  • the present invention has any one of the following configurations (1) to (3) in order to achieve the above object.
  • (1) The transmittance when irradiated with a wavelength of 405 nm is 30% or more, the breaking strength is 4.3 to 9.0 cN / dtex, the breaking elongation is 11.0 to 50.0%, and the 10% modulus is 2
  • Polyester monofilament for screen gauze having a viscosity of 0.5 to 9.0 cN / dtex (2)
  • (3) A mesh fabric for direct digital plate making, wherein the polyester monofilament according to (1) or (2) is arranged on at least a part of at least one of a warp and a weft.
  • the monofilament of the present invention having excellent transmittance at a wavelength of 405 nm used for exposure is suitable for direct digital plate making, can shorten the emulsion curing time, and can perform high-definition screen printing in a short time. In addition to being possible, it is possible to suppress printing defects such as fluffing and scum generated during weaving.
  • FIG. 1 is a schematic diagram for explaining a sample preparation method when measuring the transmittance of the polyester monofilament for screen gauze of the present invention.
  • FIG. 2 is a schematic diagram for explaining a method for measuring a kinetic friction coefficient between a raw yarn and a matte metal in a polyester monofilament for screen gauze of the present invention.
  • FIG. 3 is a schematic view showing an example of a spinning apparatus in a two-step method used in the present invention.
  • FIG. 4 is a schematic view showing an example of a stretching apparatus in a two-step method used in the present invention.
  • FIG. 5 is a schematic diagram showing an example of a yarn-making apparatus in a one-step method (direct spinning and drawing method) used in the present invention.
  • the polyester monofilament for screen gauze of the present invention is a polyester monofilament containing polyethylene terephthalate as a main component.
  • main component means a component occupying 60 wt% or more of all the components
  • polyethylene terephthalate as a main component means that polyethylene terephthalate is used as a resin component constituting a monofilament. This indicates that the content is 60 wt% or more.
  • the polyester monofilament for screen gauze of the present invention has a transmittance of 30% or more when a wavelength of 405 nm is applied to a monofilament wound uniformly and uniformly in a direction of 0.018 g / cm 2 on a transparent acrylic plate having a thickness of 2 mm. It is.
  • FIG. 1 is a schematic diagram for explaining a sample preparation method when measuring the transmittance of the polyester monofilament for screen gauze of the present invention.
  • a transparent acrylic plate 1 having a thickness of 2 mm is set in an alignment winding evaluation device 2, and the transparent acrylic plate 1 is rotated while traversing.
  • the monofilament Y which has been unwound through the nip roll 4, the tensor 5, the direction change roll 6, and the yarn path regulation guide 7 via the unwinding guide 3, is rotating at a density of 0.018 g / cm 2 in a uniform direction.
  • the plate-wound sample 8 is placed on a spectrophotometer, and then the transmittance T1 of the plate-wound sample 8 at a wavelength of 405 nm of a laser used for curing the emulsion is measured.
  • T2 (%) T1 + (100 ⁇ T0) (1)
  • the polyester monofilament for screen gauze for direct digital plate making it has been found that it is important for the polyester monofilament for screen gauze for direct digital plate making to have a transmittance of 30% or more at a wavelength of 405 nm.
  • a monofilament having a transmittance of 30% or more it is possible to shorten the emulsion hardening time when irradiating a laser necessary for emulsion hardening, and it is possible to perform highly accurate screen printing in a short time.
  • the transmittance is less than 30%, the emulsion may not be sufficiently cured in a short time, and it may not be possible to print a pattern as designed.
  • the more preferred 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 is preferably 80% or less, and more preferably 70% or less, from the viewpoint of higher passability in the weaving process.
  • ⁇ ⁇ In order to obtain such a monofilament having a high transmittance at a wavelength of 405 nm, it is preferable to use, for example, a bright polyester in which the content of titanium oxide contained in the polyester is suppressed. Although it is possible to obtain a bright monofilament having a high transmittance by another method, it is preferable to minimize the content of titanium oxide generally known as a matting agent, and the preferable content of titanium oxide is 0. 0.030 wt% or less, and more preferably 0.027 wt% or less.
  • the polyester monofilament for screen gauze of the present invention is formed of polyethylene terephthalate having terephthalic acid as a main acid component and ethylene glycol as a main glycol component, and 90% by mole or more of ethylene terephthalate repeating units.
  • the copolymer may contain a copolymer component capable of forming another ester bond at a ratio of less than 10 mol%.
  • a metal catalyst, inorganic particles, a lubricant, an antioxidant, a flame retardant, an antistatic agent, and the like can be added to polyethylene terephthalate, if necessary, within a range that does not impair the transmittance characteristic of the present invention.
  • the intrinsic viscosity of the yarn in the polyester monofilament for screen gauze of the present invention is preferably from 0.60 to 0.90 in view of the strength and the spinning stability of the obtained monofilament, and more preferably from 0.60 to 0.82. is there.
  • the cross-sectional form of the yarn in the polyester monofilament for screen gauze of the present invention can take any form of a single component / core-sheath composite.
  • the monofilament is preferably a single-component yarn because the laser may be reflected and scattered at the interface between the core and the sheath.
  • the polyester monofilament for screen gauze of the present invention has a breaking strength of 4.3 to 9.0 cN / dtex and a breaking elongation of 11.0 to 50.0%. If the strength is too high and the elongation is too low, there is no elongation, the processability in yarn production and weaving is reduced, and the yarn breaks frequently. Therefore, 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 the breaking elongation is 25.0% or more.
  • the polyester monofilament for screen gauze of the present invention has a 10% modulus of 2.5 to 9.0 cN / dtex. If the 10% modulus is too low, the gauze stability cannot be obtained, and the printing accuracy may decrease. On the other hand, if the 10% modulus is too high, the fiber surface becomes highly oriented, and it may be difficult to suppress fluffing defects and scum defects generated during weaving. Therefore, the 10% modulus is 2.5 to 9.0 cN / dtex, and the preferred 10% modulus is 2.8 to 5.0 cN / dtex.
  • the monofilament fineness of the polyester monofilament for screen gauze of the present invention is preferably 65.0 dtex or less in view of the needs for screen gauze applications, and is preferably 4.0 dtex or more from the viewpoint of spinning properties. More preferably, it is 8.0 to 62.0 dtex.
  • the boiling water shrinkage ratio of the polyester monofilament for screen gauze of the present invention is preferably 5.0 to 12.0%. If the crystallization of the monofilament progresses excessively, the boiling water shrinkage decreases, but the yarn may whiten due to excessive progress of crystallization. In such a case, the transmittance for the wavelength of 405 nm, which is a feature of the present invention, may be impaired, so that the boiling water shrinkage is preferably 5.0% or more. In addition, by setting the boiling water shrinkage to 12.0% or less, dimensional stability during heat setting can be obtained. Therefore, the boiling water shrinkage is preferably 12.0% or less. More preferably, the boiling water shrinkage is from 6.0 to 10.0%.
  • the coefficient of kinetic friction between the yarn and the matte metal (hereinafter, also referred to as the coefficient of kinetic friction between the yarn and matte metal) is preferably 0.100 to 0.170.
  • the matte metal refers to a metal having fine irregularities on its surface. In the present invention, the coefficient of kinetic friction between the raw yarn and the matte metal when the matte metal having a surface roughness of 6S is used is measured.
  • the coefficient of kinetic friction between the raw yarn and the satin metal By setting the coefficient of kinetic friction between the raw yarn and the satin metal to 0.170 or less, it is possible to suppress the yarn surface from being scraped due to the abrasion resistance with the reed in weaving, and it is possible to prevent fluffing on the cut nodes and powder scum. Can reduce printing defects and improve the printing accuracy of the screen gauze. For example, in the case of a bright monofilament in which the content of inorganic particles such as titanium oxide that functions as a lubricant is minimized, the coefficient of kinetic friction between the raw yarn and satin metal can be suppressed and the processability in weaving can be improved. It is important that the coefficient of dynamic friction between the yarn and the matte metal is preferably 0.170 or less.
  • the dynamic friction coefficient is preferably 0.100 or more.
  • a more preferable dynamic friction coefficient between the yarn and the matte metal is 0.130 or more.
  • the oil content of the drawn yarn in the polyester monofilament for screen gauze of the present invention is preferably 0.10 to 0.70 wt%.
  • the oil content is 0.10 to 0.70 wt% or more, it is possible to suppress an increase in the dynamic friction coefficient between the raw yarn and the matte metal, and to suppress a fluffing defect and a scum defect caused by insufficient formation of an oil film.
  • the oil content is 0.10 to 0.70 wt%, and more preferably 0.10 to 0.50 wt%.
  • the method for spinning the polyester monofilament of the present invention is not particularly limited, and may be in accordance with a known technique. For example, after polyethylene terephthalate is melt-extruded, the polyethylene terephthalate is filtered in a predetermined spin pack, the yarn discharged from the spinneret is solidified by cooling air, an oil agent is applied by an oil supply roll, and then taken out via a godet roll. To obtain an undrawn yarn.
  • the undrawn yarn may be wound once and then drawn by a drawing machine in a two-step method, or a one-step method in which the undrawn yarn is continuously drawn without being wound once (direct spin drawing method). After discharging from the spinneret for the purpose of suppressing the orientation of the fiber surface, the fiber may be passed through a positively heated heat retaining cylinder.
  • the oil agent applied to the polyester monofilament for screen gauze of the present invention contains a fatty acid alkyl ester-based smoothing agent in an amount of 45 to 65 wt% from the viewpoint of higher passability, as an oil component concentration excluding water in the emulsion. Preferably, it is 50 to 60 wt%.
  • a fatty acid alkyl ester-based smoothing agent in an amount of 45 to 65 wt% from the viewpoint of higher passability, as an oil component concentration excluding water in the emulsion.
  • it is 50 to 60 wt%.
  • bright polyester monofilaments that minimize the content of inorganic particles such as titanium oxide that function as a lubricant are less likely to form fine irregularities on the fiber surface than ordinary polyester monofilaments for screen gauze.
  • the coefficient of kinetic friction between the yarn and the matte metal increases, and it is difficult to suppress the fluffing defect and the scum defect caused by the rubbing 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 matte metal can be suppressed.
  • the silicone-modified product in an amount of 6 wt% or more, it is possible to suppress the coefficient of dynamic friction between the raw yarn and the matte metal in the bright polyester monofilament until it can withstand abrasion resistance with a reed in weaving.
  • the content of the silicone-modified product exceeds 8 wt%, the kinetic friction coefficient between the raw yarn and the matte metal causes saturation, and the effect of suppressing the kinetic friction coefficient between the raw yarn and the matte metal can no longer be obtained. There is.
  • the content of the silicone-modified product contained in the emulsion is preferably 6 to 8% by weight, more preferably 7 to 8% by weight as an oil component concentration excluding water.
  • the oil agent imparted to the polyester monofilament of the present invention includes, as long as the smoothness is not impaired, an antistatic agent such as an alkyl sulfonate, an extreme pressure agent such as an alkyl phosphate, an oil film strengthening agent, an emulsifier, a pH adjuster, a preservative, and the like. May be added.
  • the emulsion concentration of the oil agent applied to the polyester monofilament of the present invention is preferably 2 to 12 wt%, more preferably 2 to 10 wt%, from the viewpoint of scattering of the oil agent and the stability of the oil film on the oil supply roller.
  • the spinning speed of the polyester monofilament of the present invention is preferably 500 to 1300 m / min.
  • the speed of the godet roll is set to 500 m / min or more, the running property of the yarn can be stabilized, and by setting the speed of the godet roll to 1300 m / min or less, the fiber surface orientation generated before drawing can be promoted, and It is possible to suppress the resulting fuzz and scum defects.
  • a more preferred spinning speed is from 700 to 1200 m / min.
  • the stretching method of the polyester monofilament of the present invention is not particularly limited, and can be in accordance with a known technique. For example, after one-stage heating and stretching between a first hot roll and a second hot roll, a cold godet roll is used. Winding to obtain a drawn yarn.
  • two-stage heat stretching in which the first-stage heat stretching is performed between the first hot roll and the second hot roll, and the second-stage heat stretching is performed between the second hot roll and the third hot roll, instead of the one-stage heat stretching. May be adopted.
  • the stretching temperature of the polyester monofilament of the present invention is, in the case of one-stage heating stretching, the temperature of the first hot roll is set to the glass transition temperature of the polyester of the core component + 10 ° C. to the glass transition temperature + 30 ° C., and the temperature of the second hot roll is set.
  • the temperature is preferably in the range of 130 ° C to 200 ° C.
  • the fiber orientation can be controlled and the crystallization of the fiber can be promoted, so that the yarn can have high strength.
  • 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 high-strength, high-modulus yarn. Further, in order to suppress a decrease in the processability in the yarn-making process and the weaving process, it is necessary to leave a margin for yarn elongation and to suppress fuzzing and scum defects in weaving, so that the total is 6.0 times or less. Is preferred. A more preferable total stretching ratio is 3.5 to 5.0 times.
  • polyester monofilament for screen gauze of the present invention when stretched, between the final hot roll and the cold godet roll, it is possible to wind at the same speed or to reduce the speed difference between the two rolls for the purpose of suppressing the orientation of the amorphous portion.
  • a relaxation process can be provided.
  • the mesh fabric produced using the polyester monofilament of the present invention can be suitably used for direct digital plate making.
  • the polyester monofilament of the present invention is preferably disposed on at least a part of at least one of the warp and the weft of the mesh fabric, and at least one of the warp and the weft of the mesh fabric is formed by the polyester monofilament of the present invention. It is more preferable that both the warp and the weft are formed of the polyester monofilament of the present invention.
  • polyester monofilament for screen gauze of the present invention will be described in detail with reference to examples.
  • the evaluation in the examples was performed according to the following method.
  • a transparent acrylic plate 1 manufactured by MISUMI Group Inc .: Model ACSH series
  • an alignment winding evaluation device 2 manufactured by Eiko Sangyo Co., Ltd. installed.
  • the monofilament Y which is rotated at 550 rpm while the transparent acrylic plate 1 is traversed, applied with a tension of 10 g through the nip roll 4, the tensor 5, the direction change roll 6 and the yarn path regulation guide 7 via the unwinding guide 3, and runs.
  • the transmittance (T2) of the monofilament alone at 405 nm was calculated according to the following equation (1).
  • T2 T1 + (100 ⁇ T0) (1)
  • the transmittance T3 at a wavelength of 405 nm was measured.
  • Intrinsic viscosity (IV) According to the following equation (2), the intrinsic viscosity (IV) of the yarn in the polyester monofilament was calculated.
  • the relative viscosity ⁇ r in the formula (2) is obtained 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 a temperature of 25 ° C. was determined by the following formula (3) using an Ostwald viscometer.
  • OCP o-chlorophenol
  • ⁇ viscosity of sample solution
  • ⁇ 0 viscosity of OCP
  • t fall time of solution (seconds)
  • d density of solution (g / cm 3 )
  • t0 OCP fall time (seconds)
  • d0 density of OCP (g / cm 3 ) It is.
  • Glass transition temperature (Tg) 10 mg of the polyester powder to be used was sampled, and a differential scanning calorimeter (Perkin Elmer: DSC-4 type) was used to raise the temperature at 16 ° C./min. And a glass transition temperature Tg (° C.).
  • Boiling water shrinkage rate A monofilament was skeined using a measuring machine having a frame circumference of 100 cm, and a small skein having ten turns was produced. A constant load was applied to the obtained small skein, and the initial skein length L0 (mm) was measured. After removing the weight, immersing in hot water of 100 ° C. for 15 minutes and drying for 30 minutes or more, applying a constant load, measuring the skein length L1 (mm) after shrinkage, and boiling water shrinkage rate according to the following equation (4) (%) was calculated.
  • Boiling water shrinkage (L0 ⁇ L1) / L0 ⁇ 100 (4)
  • the load (g) applied when measuring the initial skein length and the skein length after shrinkage was set according to the following equation (5) based on the total fineness T (dtex) of the yarn.
  • Load T ⁇ 0.9 ⁇ (1/30) ⁇ 20 (5)
  • N2 (g) measured by the tensiometer 13 when taken by the take-up roll 14 via the tensiometer 13 was measured, and It calculated according to the formula (6).
  • Coefficient of kinetic friction between raw yarn and satin metal 1 / ⁇ ⁇ log e (N2 / N1) (6)
  • B The number of fuzz / scum defects is 2 to 5 per 30 m in length.
  • C The number of fuzz / scum defects is 30 m in length. 6 to 9
  • D The number of defects of fluff and scum is 10 or more per 30 m length
  • Example 1 Polyethylene terephthalate (glass transition temperature: 80 ° C.) having a titanium oxide content of 0.025 wt%, which was polymerized and formed into chips by an ordinary method, was melted at a temperature of 287 ° C. using an extruder (pressure melter), and then pumped. , Into a known single-component die. The time for the polymer to pass through the pipe was 30 minutes, and the pressure applied to the base was 10 MPa. Thereafter, the yarn discharged from the spinneret was spun using a prevention device provided with equipment as shown in FIG.
  • the polyester monofilament discharged from the spinneret 15 is cooled by applying a cooling air of 20 m / min by the yarn cooling blower 16, and an oil agent having an emulsion concentration of 4 wt% is applied by the oil supply roll 17, and then 900 m / min.
  • the undrawn yarn package 19 was obtained by taking up the godet roll 18 at an unheated speed at a speed.
  • the oil agent applied to the undrawn yarn contains 54% by weight of a fatty acid alkyl ester as a leveling agent and 7% by weight of a silicone-modified product.
  • an alkyl phosphate as an extreme pressure agent, an alkyl sulfonate as an antistatic agent, an ester nonion as an emulsifier and Ether nonions were included.
  • drawing was performed using a drawing device equipped with equipment as shown in FIG. That is, the first hot roll 21 heated to a temperature of 91 ° C. at a speed of 174 m / min through the supply roll 20 and the second hot roll 22 heated to a temperature of 130 ° C. at a speed of 710 m / min. Stretching and heat setting were performed at a stretching ratio of 4.1 times. Further, the wire was wound around the cold godet roll 23 at a speed of 710 m / min, and was wound by controlling the spindle rotation speed to obtain a drawn yarn package 24 of 31.8 dtex (fiber diameter 54 ⁇ m) of polyester monofilament.
  • the obtained polyester monofilament has a breaking strength of 4.7 cN / dtex, a breaking elongation of 44.5%, a 10% modulus of 3.0 cN / dtex, an amount of titanium oxide of 0.025 wt%, and other physical properties. It is as shown in Table 1.
  • the obtained 31.8 dtex (54 ⁇ m) polyester monofilament was wound around a transparent acrylic plate four times (eight layers), and the transmittance when irradiated with a wavelength of 405 nm was 39%.
  • Table 1 shows the evaluation results of screen gauze quality due to fuzzing and scum defects when the obtained polyester monofilament is woven with a mesh number of # 120, and the printing evaluation results based on line accuracy and dimensional stability when a 405 nm laser is irradiated for 40 seconds. It is as follows. As for the screen gauze quality, the fuzziness and scum defect were extremely good at 0 to 1 per 30 m length. The transmittance of the mesh fabric at a wavelength of 405 nm was 82%. As the printing evaluation results, the line accuracy was very good, the dimensional stability was also good, and comprehensively excellent printing accuracy was obtained.
  • Example 2 A polyester monofilament of 32.0 dtex was obtained in the same manner as in Example 1, except that the content of titanium oxide was changed to 0.001 wt%.
  • the titanium oxide content of the obtained polyester monofilament was 0.001% by weight, and other physical properties are as shown in Table 1. Due to the decrease in the titanium oxide content, the transmittance when irradiated with a wavelength of 405 nm was as high as 46% as compared with Example 1. On the other hand, since the formation of minute irregularities on the fiber surface is suppressed due to the decrease in the titanium oxide content, the coefficient of kinetic friction between the raw yarn and the matte metal is slightly higher than that in Example 1, but the quality of the screen gauze is high.
  • the fuzz and scum defects were the same as those in Example 1, and extremely good results were obtained.
  • the transmittance of the mesh fabric at a wavelength of 405 nm was 86%.
  • the line accuracy and the dimensional stability were equivalent to those in Example 1, and excellent printing accuracy was obtained.
  • Example 1 A polyester monofilament of 32.5 dtex was obtained in the same manner as in Example 1, except that the titanium oxide content was changed to 0.500 wt% and the transmittance at the time of irradiation with a wavelength of 405 nm was changed to 18%.
  • the titanium oxide content of the obtained polyester monofilament was 0.500% by weight, and other physical properties are as shown in Table 1. Due to the increase in the content of titanium oxide, the coefficient of kinetic friction between the raw yarn and the matte metal was lower than that in Example 1, but the transmittance upon irradiation with a wavelength of 405 nm was significantly reduced to 18%. The quality of the screen gauze was extremely good as in Example 1.
  • the transmittance was 68%.
  • the time required for the emulsion hardening was insufficient, and irregularities occurred at the line boundaries.
  • the printing accuracy was greatly inferior to the result.
  • Example 3 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 intrinsic viscosity of the obtained polyester monofilament was 0.77
  • the breaking strength was 5.5 cN / dtex
  • the breaking elongation was 32.4%
  • the 10% modulus was 3.9 cN / dtex.
  • Other physical properties are as shown in Table 1.
  • Example 4 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 intrinsic viscosity of the obtained polyester monofilament was 0.92
  • the breaking strength was 6.3 cN / dtex
  • the breaking elongation was 21.3%
  • the 10% modulus was 5.1 cN / dtex.
  • Other physical properties are as shown in Table 2, and as in Example 3, a yarn having high strength, low elongation and high modulus was obtained by increasing the IV compared to Example 1.
  • the quality of the screen gauze was extremely good as in Example 1.
  • Example 2 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 intrinsic viscosity of the obtained polyester monofilament was 0.55
  • the breaking strength was 4.2 cN / dtex
  • the breaking elongation was 52.4%
  • the 10% modulus was 2.3 cN / dtex.
  • Other physical properties are as shown in Table 2.
  • Example 1 As a result of the printing evaluation, the lowering of modulus compared to Example 1 resulted in a decrease in gauze stability, and the line accuracy was lower than that of Example 1. The dimensional stability was also greatly reduced due to the occurrence of gauze elongation due to low strength and high elongation, and the printing accuracy was significantly inferior to that of Example 1.
  • Example 5 A polyester monofilament of 33.0 dtex was obtained in the same manner as in Example 1, except that the spinning speed (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%, and a 10% modulus of 4.7 cN / dtex, and other physical properties as shown in Table 2. Due to the high spinning speed, the orientation of the fiber surface becomes large, the fluffing defect and the scum defect in the weaving process are slightly increased compared to Example 1, and the screen gauze quality is slightly inferior to Example 1, but is actually used. Had no problem. As a result of the printing evaluation, the line accuracy was extremely good, and the high strength and low elongation improved the dimensional stability as compared with Example 1, and the printing accuracy was extremely good.
  • Example 6 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 are as shown in Table 2, and the kinetic friction coefficient between the raw yarn and the satin metal was 0.190, which was higher than that of Example 1.
  • the fuzzing defect and the scum defect are slightly increased in the weaving process, and the screen gauze quality is slightly inferior to that of Example 1, but has no problem in actual use. there were.
  • both the line accuracy and the dimensional stability were equivalent to those in Example 1, and excellent printing accuracy was obtained.
  • Table 2 shows the results of Examples 4 to 6 and Comparative Example 2.
  • Example 7 A polyester monofilament of 32.1 dtex was obtained in the same manner as in Example 1, except that the content of the silicone-modified product in the oil agent was changed to 2% by weight.
  • the physical properties of the obtained polyester monofilament are as shown in Table 3, and the kinetic friction coefficient between the yarn and the matte metal was 0.203, which was higher than that of Example 1.
  • the fuzzing defect and the scum defect are slightly increased in the weaving process, and the screen gauze quality is slightly inferior to that of Example 1, but has no problem in actual use. there were.
  • the line accuracy was slightly inferior to that of Example 1 because fuzzing occurred partially and printing defects occurred.
  • the dimensional stability was as good as in Example 1, and the overall printing accuracy was slightly inferior to Example 1, but generally excellent printing accuracy was obtained.
  • Example 8 A polyester monofilament of 33.0 dtex was obtained in the same manner as in Example 1, except that the content of the silicone-modified product in the oil agent was changed to 5 wt%.
  • the physical properties of the obtained polyester monofilament are as shown in Table 3, and the coefficient of kinetic friction between the raw yarn and the matte metal was 0.184, which was higher than that of Example 1.
  • the fuzzing defect and the scum defect are slightly increased in the weaving process, and the screen gauze quality is slightly inferior to that of Example 1, but has no problem in actual use. there were.
  • both the line accuracy and the dimensional stability were equivalent to those in Example 1, and excellent printing accuracy was obtained.
  • Example 9 A polyester monofilament of 33.1 dtex was obtained in the same manner as in Example 1, except that the content of the silicone-modified product in the oil agent was changed to 9% by weight.
  • the physical properties of the obtained polyester monofilament are as shown in Table 3, and the kinetic friction coefficient between the raw yarn and the matte metal was 0.160, which was equivalent to that of Example 1. Oil film cracking had occurred. As a result, it is considered that spots of oil attached to the yarn occurred, and fluffing defects and scum defects were slightly increased in the weaving process, and the screen gauze quality was slightly inferior to that of Example 1, but in actual use. There was no problem. As the printing evaluation results, both the line accuracy and the dimensional stability were equivalent to those in Example 1, and excellent printing accuracy was obtained.
  • Example 10 A polyester monofilament of 32.9 dtex was obtained in the same manner as in Example 1, except that the oil content of the drawn yarn was changed to 0.35 wt%. Table 3 shows the physical properties of the obtained polyester monofilament. In terms of screen gauze quality, fuzziness and scum defects were the same as those of Example 1, and extremely good results were obtained. As for the printing evaluation results, the line accuracy and the dimensional stability were equivalent to those in Example 1, and excellent printing accuracy was obtained.
  • Table 3 shows the results of Examples 7 to 10.
  • Example 11 A 33.1 dtex polyester monofilament was obtained in the same manner as in Example 1 except that the amount of oil attached to the drawn yarn was changed to 0.07 wt%.
  • the physical properties of the obtained polyester monofilament are as shown in Table 4, and the coefficient of kinetic friction between the raw yarn and the matte metal was 0.191, which was higher than that of Example 1.
  • the fuzzing defect and the scum defect are slightly increased in the weaving process, and the screen gauze quality is slightly inferior to that of Example 1, but has no problem in actual use. there were.
  • the line accuracy was slightly inferior to that of the first embodiment because fuzzing occurred partially and printing defects occurred.
  • the dimensional stability was as good as in Example 1, and the overall printing accuracy was slightly inferior to Example 1, but generally excellent printing accuracy was obtained.
  • Example 12 A polyester monofilament of 32.1 dtex was obtained in the same manner as in Example 1, except that the oil content of the drawn yarn was changed to 0.75 wt%.
  • the physical properties of the obtained polyester monofilament are as shown in Table 4.
  • Example 13 In the stretching step, 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. Table 4 shows the physical properties of the obtained polyester monofilament.
  • the quality of the screen gauze was extremely good as in Example 1.
  • the Uster unevenness U% (N) was slightly deteriorated compared to Example 1 due to insufficient preheating of stretching, and the uniformity of the fiber diameter was inferior.
  • the line accuracy was slightly higher than that of Example 1. Became inferior.
  • the dimensional stability was a good result as in Example 1.
  • the overall printing accuracy was slightly inferior to Example 1, but generally excellent printing accuracy was obtained.
  • Example 14 In the stretching step, a 31.8 dtex polyester monofilament was obtained in the same manner as in Example 1 except that the speed of the first hot roll was changed and the stretching ratio was changed to 4.7 times.
  • 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 orientation was increased by using a high stretching ratio, and the fluffing defect and the scum defect were slightly increased in the weaving process.
  • the screen gauze quality was slightly inferior to that of Example 1, but had no problem in actual use.
  • the line accuracy and the dimensional stability were equivalent to those in Example 1, and excellent printing accuracy was obtained.
  • Example 15 Polyester monofilament of 20.0 dtex (fiber diameter 43 ⁇ m) 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. I got The obtained polyester monofilament has a breaking strength of 5.6 cN / dtex, a breaking elongation of 32.5%, and a 10% modulus of 4.1 cN / dtex. Other physical properties are as shown in Table 5.
  • a polyester monofilament of 20.0 dtex (43 ⁇ m) was wound 5 times (10 layers) around a transparent acrylic plate so that the density became equivalent to that of a plate-wound sample in which 32 dtex (54 ⁇ m) was wound 4 times (8 layers).
  • the transmittance upon irradiation was 37%.
  • the obtained polyester monofilament was woven with a mesh number of # 220, and the gauze quality and printing accuracy were evaluated.
  • the quality of the screen gauze was extremely good as in Example 1.
  • the line accuracy was extremely good.
  • the dimensional stability was improved due to the higher strength and the higher modulus as compared with Example 1, and the printing accuracy was extremely good.
  • Example 16 8.0 dtex (fiber diameter 27 ⁇ m) polyester monofilament 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. I got The obtained polyester monofilament has 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 wrapped eight times (16 layers) around a transparent acrylic plate so as to have a density equivalent to that of a plate-wound sample in which 32 dtex (54 ⁇ m) was wound four times (eight layers).
  • the transmittance upon irradiation was 38%.
  • the obtained polyester monofilament was woven with a mesh number of # 380, and the gauze quality and printing accuracy were evaluated.
  • the quality of the screen gauze was extremely good as in Example 1.
  • the line accuracy was extremely good.
  • the dimensional stability was improved due to the higher strength and the higher modulus as compared with Example 1, and the printing accuracy was extremely good.
  • Example 17 A core-sheath composite polyester monofilament was produced by a one-step method (direct spinning and drawing method) using a yarn producing apparatus provided with the equipment shown in FIG. That is, as a high-viscosity polymer, polyethylene terephthalate (glass transition temperature: 80 ° C.) having a titanium oxide content of 0.025 wt% and an intrinsic viscosity of 1.00, and a titanium oxide content of 0.025 wt% as a low-viscosity polymer, Polyethylene terephthalate having an intrinsic viscosity of 0.51 (glass transition temperature: 80 ° C.) was polymerized by a conventional method into chips.
  • a high-viscosity polymer polyethylene terephthalate (glass transition temperature: 80 ° C.) having a titanium oxide content of 0.025 wt% and an intrinsic viscosity of 1.00, and a titanium oxide content of 0.025 wt% as a low-viscosity polymer
  • the polyester monofilament discharged from the composite mouthpiece 25 is heated and kept warm by the heat retaining tube 26 at 380 ° C., and then cooled by applying cooling air at a wind speed of 10 m / min by the yarn cooling blower 27.
  • the oil agent was taken up by a non-heated spinning godet roll 29 at a speed of 500 m / min, and heated to a temperature of 91 ° C. at a speed of 505 m / min without winding.
  • a drawn yarn package 36 of a core-sheath composite polyester monofilament of 0 dtex (fiber diameter 24 ⁇ m) was obtained.
  • the oil agent applied to the polyester monofilament contains 54% by weight of a fatty acid alkyl ester as a leveling agent and 7% by weight of a silicone-modified product.
  • a fatty acid alkyl ester as a leveling agent
  • a silicone-modified product contains 54% by weight of a fatty acid alkyl ester as a leveling agent and 7% by weight of a silicone-modified product.
  • an alkyl phosphate as an extreme pressure agent, an alkyl sulfonate as an antistatic agent, an ester nonion and an ether as an emulsifier Nonions were included.
  • the obtained polyester monofilament has a breaking strength of 8.5 cN / dtex, a breaking elongation of 13.7%, a 10% modulus of 8.1 cN / dtex, an amount of titanium oxide of 0.025 wt%, and an intrinsic viscosity of 0.81. And other physical properties are as shown in Table 6.
  • a polyester monofilament of 6.0 dtex (24 ⁇ m) was wound 9 rounds (18 layers) on a transparent acrylic plate so that the density became equivalent to that of a plate-wound sample in which 32 dtex (54 ⁇ m) was wound 4 rounds (8 layers).
  • the transmittance at the time of irradiation was 31%, and it was considered that light having a wavelength of 405 nm was slightly reflected and scattered at the interface between the core and the sheath, because the cross-sectional shape of the yarn was a core-sheath composite. It was slightly lower than 1.
  • Table 6 shows the results of the evaluation of the quality of the screen gauze based on the fuzziness and the scum defect, and the results of the printing evaluation based on the line accuracy and dimensional stability when the obtained polyester monofilament is woven with a mesh number of # 420.
  • Example 3 In the same manner as in Example 17, a core-sheath composite polyester monofilament was produced by a one-step method (direct spinning and drawing method). At that 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 times. In addition, the temperature of the third hot roll was changed to 220 ° C., and other manufacturing conditions were the same as in Example 17, to obtain a core-sheath composite polyester monofilament of 6.0 dtex (fiber diameter: 24 ⁇ m).
  • the physical properties of the obtained polyester monofilament were as follows: breaking strength was 9.2 cN / dtex, breaking elongation was 10.2%, 10% modulus was 9.1 cN / dtex, boiling water shrinkage was 4.8%, and titanium oxide amount was 0.025 wt%, and other physical properties are as shown in Table 6.
  • a polyester monofilament of 6.0 dtex (24 ⁇ m) was wound 9 rounds (18 layers) on a transparent acrylic plate so that the density became equivalent to that of a plate-wound sample in which 32 dtex (54 ⁇ m) was wound 4 rounds (8 layers).
  • the transmittance at the time of irradiation is 26%.
  • Example 6 shows the results of the evaluation of the quality of the screen gauze based on the fuzziness and the scum defect, and the results of the printing evaluation based on the line accuracy and dimensional stability when the obtained polyester monofilament is woven with a mesh number of # 420. In the weaving process, yarn breakage increased due to a decrease in stretch of gauze due to low elongation.
  • Example 17 As for the screen gauze quality, the fluffing and scum defects were reduced to 6 to 9 per 30 m in length due to the higher stretching ratio and higher modulus as compared with Example 17, which was inferior to Example 1. .
  • the transmittance of the yarn was lower than that of Example 1.
  • the emulsion hardening was slightly insufficient, and irregularities occurred at the line boundaries. The printing precision was far from that of Example 1.
  • Example 17 The results of Example 17 and Comparative Example 3 are shown in Table 6.
  • Y monofilament d: satin metal roll diameter 1: transparent acrylic plate 2: aligned winding evaluation device 3: unwinding guide 4: nip roll 5: tensor 6: direction change roll 7: yarn path regulation guide 8: plate winding sample 9: Balancer 10: Direction change guide 11: Fixed pin made of satin metal 12: Direction change guide 13: Tensiometer 14: Take-up roll 15: Spinneret 16: Yarn cooling and blowing device 17: Oil supply roll 18: Godet roll 19: Undrawn yarn package Reference numeral 20: supply roll 21: first hot roll 22: second hot roll 23: cold godet roll 24: drawn yarn package 25: composite spinneret 26: heat retaining cylinder 27: yarn cooling blower 28: oil supply roll 29: spinning godet roll 30: First hot roll 31: Second hot roll 32: Third hot roll 33: Cold godet roll 34: cold godet roll 35: yarn winding device 36: drawn yarn package

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Artificial Filaments (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Woven Fabrics (AREA)

Abstract

La présente invention concerne un monofilament de polyester pour tissus de tamis, qui ne nécessite aucune étape de coloration et convient à une utilisation pour la fabrication directe de plaques numériques dans laquelle aucun film positif n'est utilisé. Le monofilament de polyester permet de raccourcir le temps de durcissement d'émulsion et de réaliser ainsi une sérigraphie très précise en un délai court, a une excellente transmission de lumière laser et une excellente aptitude au passage d'ordre supérieur dans le tissage. Le monofilament de polyester pour tissus de tamis selon la présente invention présente une transmittance, en irradiation avec de la lumière ayant une longueur d'onde de 405 nm, de 30 % ou plus et a une résistance à la rupture de 4,3 à 9,0 cN/dtex, un allongement à la rupture de 11,0 à 50,0 % et un module à 10 % de 2,5 à 9,0 cN/dtex.
PCT/JP2019/037722 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 WO2020067224A1 (fr)

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EP19865767.8A EP3859057A4 (fr) 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
JP2019569861A JPWO2020067224A1 (ja) 2018-09-27 2019-09-25 スクリーン紗用ポリエステルモノフィラメントおよびダイレクトデジタル製版用メッシュ織物
CN201980063598.XA CN112752873A (zh) 2018-09-27 2019-09-25 丝网纱用聚酯单丝及直接数字制版用网眼织物

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US11840799B2 (en) * 2018-03-14 2023-12-12 Nbc Meshtec Inc. Mesh member, sieve, and screen printing plate
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