WO2022004225A1 - ポリエステルモノフィラメント - Google Patents

ポリエステルモノフィラメント Download PDF

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Publication number
WO2022004225A1
WO2022004225A1 PCT/JP2021/020583 JP2021020583W WO2022004225A1 WO 2022004225 A1 WO2022004225 A1 WO 2022004225A1 JP 2021020583 W JP2021020583 W JP 2021020583W WO 2022004225 A1 WO2022004225 A1 WO 2022004225A1
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Prior art keywords
fiber diameter
filter
dtex
gel
strength
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PCT/JP2021/020583
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English (en)
French (fr)
Japanese (ja)
Inventor
遠山純史
三浦拓也
Original Assignee
東レ株式会社
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Application filed by 東レ株式会社 filed Critical 東レ株式会社
Priority to EP21834470.3A priority Critical patent/EP4144900A4/en
Priority to CN202180035253.0A priority patent/CN115605639A/zh
Priority to JP2021534683A priority patent/JPWO2022004225A1/ja
Publication of WO2022004225A1 publication Critical patent/WO2022004225A1/ja

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    • 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
    • D01D1/00—Treatment of filament-forming or like material
    • D01D1/10—Filtering or de-aerating the spinning solution or melt
    • D01D1/106—Filtering
    • 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
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/34—Core-skin structure; Spinnerette packs therefor
    • 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
    • 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
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent

Definitions

  • the present invention relates to a high-definition high-mesh filter that requires high fiber diameter uniformity and a polyester monofilament suitable for a high-mesh screen gauze for high-precision printing. More specifically, the present invention relates to a high modulus screen gauze having extremely high printing accuracy and a monofilament suitable for obtaining a high mesh filter capable of achieving both filtration performance and transmission performance.
  • screen gauze In the electronics field, weaving monofilaments called screen gauze is used for screen printing mesh cloth for printed circuit boards, as well as for molding filters used in automobiles, mobile phones, etc.
  • Specific applications for monofilament woven gauze fabrics include lint filters that prevent reattachment of dust in washing water, filters that remove dust and dirt in the room installed in air conditioners, and vacuum cleaners. Molded filters that remove dust, dust, and dust installed inside, blood transfusion kits and artificial dialysis circuit filters that remove air bubbles in the medical field, fuel channels such as fuel pumps and fuel injection devices in the automobile field. , ABS, brake, transmission, power steering and the like.
  • Patent Document 1 proposes a static kneader as a method for reducing the occurrence of an abnormal fiber diameter portion.
  • the static kneader can be expected to have the effect of suppressing the viscosity unevenness caused by the thermal history of the polymer, when a high-viscosity polymer is used or when the amount of the polymer discharged is small, a complicated flow path in the kneader can be expected.
  • the polymer stays in the kneaded material and forms a gelled product, so that it is not possible to obtain a monofilament having fine fineness and high strength raw yarn and excellent fiber diameter uniformity.
  • Patent Document 1 a method is adopted in which the number of abnormal fiber diameter portions is determined by running a thread between slits adjusted to a specific width and regarding the number of times the yarn is broken at the slit as the number of abnormal fiber diameter portions. is doing.
  • this method there is a high possibility that the thread will break at the slit if the fiber diameter is abnormal, which is sufficiently large compared to the slit width, but if the fiber diameter is relatively small, the thread will pass through the slit. Often deforms and slips through. Therefore, the method for determining the abnormal fiber diameter portion in Patent Document 1 has a problem of poor accuracy.
  • Patent Document 2 proposes to suppress the thermal deterioration of the polymer by reducing the bending of the polymer liquid feeding pipe, setting the time from the introduction of the pack to the ejection within 1 minute, and reducing the amount of heat received by the polymer as much as possible. There is. Certainly, by shortening the residence time of the polymer, the effect of suppressing the thermal deterioration of the polymer can be expected, but when spinning the fineness raw yarn of the polymer, the time from the pack introduction to the ejection is within 1 minute. It is extremely difficult to do so, and it is not possible to sufficiently provide a filtration tank for filtering foreign substances and heat-deteriorated polymers, so that it is not possible to obtain a monofilament having excellent fiber diameter uniformity.
  • Patent Document 3 proposes to suppress the generation of heat-deteriorated substances of the polymer by defining the compound of the polymer together with the temperature and heating time in the polymerization process of the polymer. Certainly, by adopting the method of Patent Document 3, the effect of suppressing the thermal deterioration of the polymer in the polymerization process is recognized, but the thermal degradation of the polymer is not only in the polymerization process of the polymer but also in the subsequent melting step. It happens. Especially when the amount of polymer discharged is small or when a polymer with high viscosity is used, deterioration products are generated more significantly and the uniformity of fiber diameter is impaired. Therefore, the filtration conditions immediately before the polymer is discharged from the mouthpiece must be specified. It was not possible to obtain a monofilament having fineness and high strength raw yarn and excellent fiber diameter uniformity.
  • the size ratio of the deteriorated gelled product to the fiber diameter increases relatively, so even minute gelled material, which has not been a problem in the past, is likely to become apparent as an abnormal fiber diameter portion.
  • fiber diameter abnormal parts such as fiber diameter abnormal parts are included, it causes fatal problems such as deterioration of filtration / permeation performance in filter applications and printing defects in screen printing applications. It is necessary to improve the fiber diameter uniformity of the monofilament as much as possible.
  • the polyester monofilament has high fiber diameter uniformity which cannot be obtained by the conventional polyester monofilament, and is suitable for a high-definition high-mesh filter and a high-mesh screen gauze for high-precision printing. Is to provide.
  • polyester monofilament having a fineness of 3.0 to 13.0 dtex and a strength of 5.0 to 9.0 cN / dtex and a strength of 2.7 to 6.0 cN / dtex at 5% elongation, it is present in 1 million m in the fiber longitudinal direction.
  • a polyester monofilament having an abnormal portion having a fiber diameter of 110% or more with respect to the fiber diameter and having a total length L of 2,000 mm or less.
  • polyester monofilaments with excellent fiber diameter uniformity which are suitable for high-definition high-mesh filters and high-mesh screen gauze for high-precision printing.
  • polyester monofilament of the present invention will be described.
  • polyester of the polyester monofilament of the present invention a polyester containing polyethylene terephthalate (hereinafter referred to as PET) as a main component is used.
  • PET polyethylene terephthalate
  • polyester having terephthalic acid as the main acid component and ethylene glycol as the main glycol component, 90 mol% or more of which is a repeating unit of ethylene terephthalate can be used.
  • it may contain a copolymerization component capable of forming other ester bonds in a proportion of less than 10 mol%.
  • copolymerization components include, as acidic components, bifunctional aromatic carboxylic acids such as isophthalic acid, phthalic acid, dibromoterephthalic acid, naphthalindicarboxylic acid, and octethoxybenzoic acid, sebacic acid, and oxalic acid.
  • Examples thereof include dicarboxylic suns such as bifunctional aliphatic carboxylic acids such as adipic acid and dimaic acid, and cyclohexanedicarboxylic acids, and examples of the glycol component include ethylene glycol, diethylene glycol, propanediol, butanediol, and neopentyl. Examples thereof include, but are not limited to, glycols, bisphenol A, polyoxyalkylene glycols such as cyclohexanedimethanol, polyethylene glycol and polypropylene glycol.
  • Titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives as antioxidants, flame retardants, antistatic agents, ultraviolet absorbers, coloring pigments, etc. should be added to PET as necessary. Can be done.
  • Polyester monofilaments include single component monofilaments formed from a single polyester and composite polyester monofilaments formed from two types of polyesters, but the present invention is not limited to either.
  • a high-viscosity polymer is placed in the core component that bears the strength, and the core component is covered with a low-viscosity excellent wear resistance.
  • the core-sheath type means that the core component may be completely covered by the sheath component, and it is not always necessary that the core components are arranged concentrically.
  • There are various cross-sectional shapes such as round, flat, triangular, square, and pentagonal, but a round cross section is preferable from the viewpoint of the uniformity of the opening of the screen gauze.
  • the composite ratio of the core component: the sheath component is preferably in the range of 60:40 to 95: 5, and the more preferable composite ratio is, in terms of achieving both the scum suppressing effect of the sheath component and the high strength of the core component. It is in the range of 70:30 to 90:10.
  • the composite ratio referred to here is the cross-sectional area ratio of the two types of polyester constituting the composite polyester monofilament in the cross-sectional photograph of the filament.
  • the physical characteristics of the polyester monofilament of the present invention will be described.
  • a monofilament suitable for a high-definition high-mesh filter and a high-mesh screen for high-precision printing when the length of the abnormal fiber diameter portion is within a specific range, the variation in the opening is small. , It has been found that a good woven fabric can be obtained to obtain a fine high mesh filter and a high mesh screen gauze for high precision printing.
  • the fiber diameter abnormal portion which exists in the fiber longitudinal direction of the monofilament at 1 million m and has a fiber diameter of 10% or more with respect to the fiber diameter, to 2,000 mm or less, the opening is uniform when weaving. It is possible to obtain a woven fabric having excellent properties. It is preferably 1,500 mm or less, more preferably 1,000 mm or less.
  • the lower limit of the fineness is preferably 3.0 dtex or more in terms of weaving property, particularly the flying property of the weft in the sulzer type loom.
  • the intensity is 5.0 to 9.0 cN / dtex, and the intensity at 5% elongation (modulus) is 2.7 to 6.0 cN / dtex. If the strength is less than 5.0 cN / dtex, the weaving property may be deteriorated, and especially in the fine fineness varieties of 13 dtex or less, there is a concern that the woven fabric may be torn due to the decrease in strength. If the strength (modulus) at 5% elongation is less than 2.7 cN / dtex, misalignment is likely to occur during gauze, clogging of openings and changes in dimensions after gauze become large, and over time. In some cases, dimensional stability may not be obtained. As the upper limit value, it is desirable that the strength is 9.0 cN / dtex or less and the strength at 5% elongation is 6.0 cN / dtex or less from the viewpoint of scum at the time of weaving.
  • the intrinsic viscosity (IV) of polyester is preferably 0.75 to 1.50. By setting the intrinsic viscosity to 0.75 or more, high strength and high modulus can be achieved, and by setting it to 1.50 or less, melt molding becomes easy. Further, when the core-sheath composite monofilament is formed, the intrinsic viscosity of the polyester used as the sheath component is preferably lower than the intrinsic viscosity of the core component polyester, and the difference is preferably 0.20 to 1.00.
  • the difference in intrinsic viscosity By setting the difference in intrinsic viscosity to 0.20 or more, the degree of orientation and crystallinity of the polyester of the sheath component, that is, the surface of the composite polyester monofilament fiber can be suppressed, and good scum resistance can be obtained. Further, since the sheath component bears the shear stress on the inner wall surface of the mouthpiece discharge hole of the molten spinning, the shearing force received by the core component becomes small. As a result, the core component is spun in a uniform state with a low degree of molecular chain orientation, so that the strength of the finally obtained composite polyester monofilament is improved. By setting the difference in intrinsic viscosity to 1.00 or less, the orientation of the sheath components proceeds appropriately, and high strength can be obtained. More preferably, it is 0.30 to 0.70.
  • the polyester monofilament of the present invention can be obtained by melting and extruding a polymer using a spinning machine, sending it to a predetermined spinning pack, filtering the polymer in the pack, and then spinning it from a spinneret.
  • a spinning machine sending it to a predetermined spinning pack, filtering the polymer in the pack, and then spinning it from a spinneret.
  • the polyester monofilament of the present invention has a non-woven fabric filter layer (hereinafter referred to as a gel capture filter) and a polygonal shape in which short metal fibers having a circular cross section installed in a molten spinning pack are sintered in a molten polymer spun from a spinneret.
  • Short metal fibers having a cross section are filtered in a molten spinning pack provided with a filter layer (hereinafter referred to as a gel subdivision filter) formed by sintering.
  • a filter layer hereinafter referred to as a gel subdivision filter
  • Two types of filter layers with different cross sections of metal short fibers enable capture and subdivision of gel-like substances generated during melting, and reduce fiber diameter abnormal parts that are 10% or more larger than the fiber diameter. , The uniformity of the monofilament becomes good.
  • the first feature of the method for producing a polyester monofilament of the present invention is a filter layer formed by sintering a short metal fiber having a polygonal cross section installed in a molten spinning pack in a molten polymer spun from a spinneret (hereinafter referred to as a filter layer).
  • a filter layer formed by sintering a short metal fiber having a polygonal cross section installed in a molten spinning pack in a molten polymer spun from a spinneret (hereinafter referred to as a filter layer).
  • Gel subdivision filter to cut and subdivide the gel-like material generated by the thermal deterioration of the polymer before spinning.
  • the desirable filtration accuracy of the gel subdivision filter is 40 ⁇ m or less. Within such a range, it is possible to reduce the fiber diameter abnormal portion having a fiber diameter of 10% or more with respect to the fiber diameter, and the fiber diameter uniformity of the monofilament becomes good. When the filtration accuracy exceeds 40 ⁇ m, the size of the gel-like substance that passes through without being subdivided becomes large.
  • the filtration accuracy of 40 ⁇ m means that it has the ability to remove 98% or more of gel-like substances (foreign substances) of 40 ⁇ m or more. Further, by setting the thickness of the gel subdivision filter to 2 mm or more, the filtration flow path becomes long, and a sufficient effect of subdividing the gel-like substance can be obtained.
  • the filtration flow path becomes short, a sufficient effect of subdividing the gel-like substance cannot be obtained, and the uniformity of the monofilament cannot be obtained. Further, if the thickness is increased, the effect of subdividing the gel-like substance is improved, but the pack pressure is also increased. Therefore, the preferable upper limit is 3 mm from the viewpoint of the pack pressure.
  • the cross-sectional shape of the short metal fibers constituting the filter is polygonal.
  • the metal short fibers having a polygonal shape the metal fibers are entangled with each other and the filterability and dispersibility are improved.
  • the gel-like material can be finely dispersed by the voids formed by laminating and sintering polygonal short metal fibers, and the gel-like material generated by the thermal deterioration of the polymer by making the cross-sectional shape sharper. The object is cut, and the effect of subdividing the gel-like substance is obtained.
  • the effect of subdividing the gel-like material cannot be obtained only by the filter layer made by sintering metal short fibers having a circular cross section, but by simply making the filter finer by having the metal short fibers having a circular cross section sintered. It is not fully realized and only causes a further increase in pack pressure due to clogging.
  • By making the cross-sectional shape of the metal short fibers polygonal it is possible to exert a sufficient effect of subdividing the gel-like material with a filter with low filtration accuracy (coarse basis weight), and the uniformity of the monofilament is good. Become.
  • the second feature of the method for producing a polyester monofilament of the present invention is that in a molten polymer spun from a spinneret, a short metal fiber having a circular cross section installed in a molten spinning pack is sintered and passes through a gel trapping filter. This is to sufficiently capture the gel-like substance generated by the thermal deterioration of the polymer.
  • the desirable filtration accuracy of the gel capture filter is 10 ⁇ m or less. Within such a range, a large gelled product can be captured, the fiber diameter abnormal portion having a large fiber diameter of 10% or more with respect to the fiber diameter can be reduced, and the fiber diameter uniformity of the monofilament is good. Become. Gel capture filter When the filtration accuracy exceeds 10 ⁇ m, a large gelled product passes through without being captured, and the fiber diameter uniformity of the monofilament deteriorates. Further, by setting the thickness of the gel trapping filter to 2 mm or more, the filtration flow path becomes long, a sufficient gel-like substance trapping effect can be obtained, and the uniformity of the monofilament becomes good.
  • the filtration flow path becomes short, a sufficient gel trapping effect cannot be obtained, and good monofilament uniformity cannot be obtained.
  • the preferable upper limit is 3 mm from the viewpoint of the pack pressure.
  • the two types of filter layers having different cross sections of the short metal fibers exert different effects of "capture” and “subdivision” of the gel-like substance, respectively, and therefore the order of the filter layers does not greatly depend on the order.
  • the gel capture filter may be installed upstream. By installing the gel capture filter on the upstream side, large-sized gel-like substances were reliably captured by the gel capture filter with high filtration accuracy, and the gel-like substances that could not be captured by the gel capture filter were installed downstream. This is because the gel-like substance can be captured and subdivided more efficiently by cutting and subdividing with a gel subdivision filter.
  • the pack pressure increases as compared with the case where the gel subdivision filter is installed downstream. Is. In that case, for example, by using a filter that has been processed into a corrugated shape and has an increased filtration area compared to a normal flat-section filter, the foreign matter retention capacity of the filter increases and the pressure rise of the pack is reduced for production application. Will be possible.
  • the polyester monofilament of the present invention has a fiber diameter that is 10% or more larger than the fiber diameter, has few abnormal fiber diameters, has a uniform opening when woven, and is used for high-definition high-mesh filters and high-precision printing. It can be suitably used for high mesh screen gauze.
  • Fineness was defined as the value obtained by multiplying the mass (g) of the skein by 20 after removing 500 m of skeins.
  • the fiber diameter of the monofilament is an optical external shape measuring instrument (PSD-200) manufactured by Sensotropic, which measures the fiber diameter by irradiating the running yarn with light and detecting the change in the amount of light reflected from the yarn. )It was used.
  • FIG. 1 shows a schematic diagram of a fiber diameter chart obtained by an optical external shape measuring instrument.
  • the horizontal axis represents time and the vertical axis represents fiber diameter, and the fiber diameter values obtained by the optical external shape measuring instrument are continuously shown as a chart.
  • the point where the fiber diameter value 1 obtained by the optical external shape measuring instrument exceeds the threshold 3 which is a fiber diameter value 10% higher than the average fiber diameter 2 is the starting point 4 and the threshold 3 of the fiber diameter abnormal portion.
  • the point below the limit is defined as the end point 5 of the abnormal fiber diameter portion.
  • each abnormal fiber diameter portion was calculated from the time and the running speed of the thread, with the start point 4 to the end point 5 of the abnormal fiber diameter portion as the length of one abnormal fiber diameter portion.
  • the sampling cycle of the measuring instrument is set to 200 kHz (200,000 times / sec), the running speed of the thread is set to 500 m / min, and the thread length is 0.04 mm at intervals of 1 million.
  • the fiber diameter for m was measured. Then, the total value of the total lengths of all the abnormal fiber diameter portions existing in the 1 million m fiber length was defined as the total length L of the abnormal fiber diameter portions.
  • Intrinsic viscosity (IV) Dissolve 0.8 g of the sample polymer in 10 mL of o-chlorophenol (hereinafter abbreviated as OCP) with a purity of 98% or more, and use an Ostwald viscometer at a temperature of 25 ° C. to obtain relative viscosity ( ⁇ r) and intrinsic viscosity ( ⁇ r). IV) was calculated by the following formula.
  • OCP o-chlorophenol
  • Intrinsic viscosity (IV) 0.0242 ⁇ r + 0.2634
  • ⁇ viscosity of the polymer solution
  • ⁇ 0 viscosity of OCP
  • t falling time of the solution (seconds)
  • d density of the solution (g / cm 3 )
  • t 0 falling time of OCP (seconds)
  • d 0 Density of OCP (g / cm 3 ).
  • the part where the black streak of the woven fabric is confirmed is counted as the number of defects, and the number of defects per 1 m of the woven fabric is 0.010.
  • the following cases were A, the cases of 0.030 or less were B, the cases of 0.050 or less were C, the cases of more than 0.050 were D, and the judgments A and B were passed.
  • Example 1 PET with an intrinsic viscosity of 1.00 (glass transition temperature 80 ° C.) as a core component and PET with an intrinsic viscosity of 0.50 as a sheath component are melted at a temperature of 295 ° C. using an extruder, and then at a polymer temperature of 280 ° C.
  • a gel-like substance is passed through a gel capture filter (filtration accuracy 10 ⁇ m, thickness 2 mm) layer formed by sintering metal fibers having a circular cross section installed in a melt spinning pack.
  • a gel subdivision filter (filtration accuracy 40 ⁇ m, thickness 2 mm) formed by sintering metal fibers having a polygonal cross section, in which a gelled product that has been sufficiently captured and has not been completely captured by the gel capture filter is installed downstream thereof.
  • the gel-like substance generated by the thermal deterioration of the polymer was captured and subdivided.
  • Both the gel capture filter and the gel subdivision filter are processed into a corrugated shape, and a filter having the same diameter as the filter having a planar cross section but having a filtration area increased by 2.5 times is used.
  • the composite polyester monofilament yarn discharged from the spinneret is heated and kept warm by a heating body so that the atmospheric temperature immediately below the spinneret becomes 290 ° C., then cooled by a yarn cooling blower, and a finishing agent is applied by an oiling agent. After applying, it is taken up at a rate of 552 m / min, stretched appropriately without winding once and heat-set to obtain the desired strength, and the fineness is 8.0 dtex, and the strength at 5% elongation is 4.6 cN /. A polyester monofilament having dtex and a strength of 7.5 cN / dtex was obtained.
  • this polyester monofilament has fineness, high strength, and high modulus, and is very excellent in weaving property with high mesh of # 400.
  • the fiber diameter uniformity is excellent
  • the length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m is 646.9 mm
  • the number of defects of the woven fabric confirmed after weaving is 0.008 pieces / m. It was very good.
  • Example 2 The fineness of 8.0 dtex and the strength at 5% elongation are the same as in Example 1 except that the order of the gel subdivision filter is reversed from that of the upstream side and that of the gel capture filter is reversed from that of the downstream side, and a filter having a planar cross section is used.
  • the characteristics of this polyester monofilament are shown in Table 1.
  • the length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m is 818.8 mm, and the number of defects of the woven fabric confirmed after weaving is 0.011 pieces / m, which is a sufficiently practical level. there were.
  • Example 3 Polyester monofilaments having a fineness of 13.0 dtex, a strength at 5% elongation of 4.6 cN / dtex, and a strength of 7.5 cN / dtex were obtained in the same manner as in Example 1 except that the fineness was changed by changing the discharge amount. ..
  • the characteristics of the obtained polyester monofilament are shown in Table 1. Although it was one step inferior to Example 1, the weavability of # 400 with a high mesh was good. Further, the length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m was 283.7 mm, and the number of defects of the woven fabric confirmed after weaving was 0.004 pieces / m, which was very good. ..
  • Example 4 Polyester monofilaments having a strength of 3.0 dtex and a strength of 4.6 cN / dtex and a strength of 7.5 cN / dtex at 5% elongation were obtained in the same manner as in Example 1 except that the discharge amount was changed to change the fineness.
  • the characteristics of the obtained polyester monofilament are shown in Table 1.
  • the weavability of # 400 on the high mesh was very good.
  • the length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m is 1334.2 mm, and the number of defects of the woven fabric confirmed after weaving is 0.018 pieces / m, which is a sufficiently practical level. rice field.
  • Example 5 Similar to Example 1, the strength is 6.0 cN / dtex, the strength at 5% elongation is 3.6 cN / dtex, and the fineness is 8., except that the intrinsic viscosity of the core component polyester is changed to 0.78. A polyester monofilament of 0 dtex was obtained. The characteristics of the obtained polyester monofilament are shown in Table 1. Compared with Example 1, the change in the woven fabric size after weaving was slightly large, and the printing accuracy when applied as a screen gauze was one step inferior, but it was at a level sufficiently durable for practical use. The length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m was 385.8 mm, and the number of defects of the woven fabric confirmed after weaving was 0.005 pieces / m, which was very good.
  • Example 6 The strength was 8.9 cN / dtex, the strength at 5% elongation was 5.9 cN / dtex, and the fineness was 8., as in Example 1, except that the intrinsic viscosity of the core component polyester was changed to 1.20. A polyester monofilament of 0 dtex was obtained. The characteristics of the obtained polyester monofilament are shown in Table 1. There was no tearing of the woven fabric, and the change in the woven fabric dimensions after weaving was very small compared to Example 1, and the printing accuracy when applied as a screen gauze was more excellent. The length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m is 944.7 mm, and the number of defects of the woven fabric confirmed after weaving is 0.014 pieces / m, which is a sufficiently practical level. rice field.
  • Example 7 PET (glass transition temperature 80 ° C.) having an intrinsic viscosity of 1.00 was melted at a temperature of 295 ° C. using an extruder, then pumped at a polymer temperature of 280 ° C. and flowed into a known single component cap.
  • a single component polyester monofilament having a fineness of 8.0 dtex, a strength at 5% elongation of 5.3 cN / dtex, and a strength of 8.1 cN / dtex was obtained in the same manner as in Example 1 except for the above.
  • the characteristics of the obtained polyester monofilament are shown in Table 1.
  • the weaving property of # 400 on the high mesh was good, and the change in the woven fabric size after weaving was very small.
  • the length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m was 764.4 mm, and the number of defects of the woven fabric confirmed after weaving was 0.010 / m, which was very good.
  • Example 1 Fineness in the same manner as in Example 1 except that a generally applied filtration filter having only a gel capture filter (filtration accuracy 10 ⁇ m, thickness 1 mm) formed by sintering metal fibers having a circular cross section was used.
  • the characteristics of this polyester monofilament are as shown in Table 1, and the length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m is 18180.0 mm, which greatly exceeds 2000 mm, which is a confirmed defect of the woven fabric. The number was 0.430 / m, which was extremely inferior to that of Example 1.
  • Comparative Example 2 Similar to Comparative Example 1, the strength at 5% elongation was 2.9 cN /, except that the intrinsic viscosity of the core component polyester was changed to 0.70 and the fineness was changed by changing the discharge rate. A polyester monofilament having dtex and strength of 5.0 cN / dtex was obtained. The characteristics of this polyester monofilament are as shown in Table 1. The length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m is 2810.0 mm, which exceeds 2000 mm, and is confirmed after weaving. The number of defects was 0.040 / m, which was inferior to that of Example 1.
  • Example 3 A polyester monofilament having a fineness of 8.0 dtex, a strength at 5% elongation of 4.6 cN / dtex, and a strength of 7.5 cN / dtex was obtained in the same manner as in Example 2 except that the thickness of the gel capture filter was changed to 1 mm. rice field.
  • the characteristics of the obtained polyester monofilament are as shown in Table 1.
  • the length L of the abnormal portion of the fiber diameter contained in the yarn length of 1 million m is 3902.5 mm, which exceeds 2000 mm, and was confirmed after weaving.
  • the number of defects of the woven fabric was 0.067 / m, which was inferior to that of Example 1.
  • Fiber diameter value 2 Average fiber diameter 3: Threshold (fiber diameter value 10% higher than the average fiber diameter) 4: Start point of abnormal fiber diameter part 5: End point of abnormal fiber diameter part
  • the polyester monofilament of the present invention can be applied to a high-definition high-mesh filter and a high-mesh screen gauze for high-precision printing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Printing Plates And Materials Therefor (AREA)
PCT/JP2021/020583 2020-06-30 2021-05-31 ポリエステルモノフィラメント WO2022004225A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21834470.3A EP4144900A4 (en) 2020-06-30 2021-05-31 Polyester monofilament
CN202180035253.0A CN115605639A (zh) 2020-06-30 2021-05-31 聚酯单丝
JP2021534683A JPWO2022004225A1 (enrdf_load_stackoverflow) 2020-06-30 2021-05-31

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JP2020112490 2020-06-30
JP2020-112490 2020-06-30

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WO2022004225A1 true WO2022004225A1 (ja) 2022-01-06

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JP (1) JPWO2022004225A1 (enrdf_load_stackoverflow)
CN (1) CN115605639A (enrdf_load_stackoverflow)
WO (1) WO2022004225A1 (enrdf_load_stackoverflow)

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CN115605639A (zh) 2023-01-13
JPWO2022004225A1 (enrdf_load_stackoverflow) 2022-01-06
EP4144900A4 (en) 2025-04-23

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