WO2018139651A1 - 無捲縮短繊維の製造方法、及び得られた無捲縮短繊維を含む湿式不織布 - Google Patents

無捲縮短繊維の製造方法、及び得られた無捲縮短繊維を含む湿式不織布 Download PDF

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WO2018139651A1
WO2018139651A1 PCT/JP2018/002771 JP2018002771W WO2018139651A1 WO 2018139651 A1 WO2018139651 A1 WO 2018139651A1 JP 2018002771 W JP2018002771 W JP 2018002771W WO 2018139651 A1 WO2018139651 A1 WO 2018139651A1
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fiber
short fibers
fiber tow
liquid
spinning
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PCT/JP2018/002771
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English (en)
French (fr)
Japanese (ja)
Inventor
紀孝 伴
合田　裕憲
泰 今井
千緒 野見山
翔平 塙
勝田　健
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帝人フロンティア株式会社
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Application filed by 帝人フロンティア株式会社 filed Critical 帝人フロンティア株式会社
Priority to JP2018564690A priority Critical patent/JP6807960B2/ja
Publication of WO2018139651A1 publication Critical patent/WO2018139651A1/ja

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
    • D01G1/06—Converting tows to slivers or yarns, e.g. in direct spinning
    • D01G1/10—Converting tows to slivers or yarns, e.g. in direct spinning by cutting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
    • D06H7/00—Apparatus or processes for cutting, or otherwise severing, specially adapted for the cutting, or otherwise severing, of textile materials
    • D06H7/04—Apparatus or processes for cutting, or otherwise severing, specially adapted for the cutting, or otherwise severing, of textile materials longitudinally

Definitions

  • the present invention relates to a method for producing an uncrimped short fiber, and more particularly to a method for producing an uncrimped short fiber excellent in dispersibility in water.
  • Patent Document 1 discloses a production method in which a drawn tow is produced by a direct spinning drawing method, and crimping is applied.
  • a can is collected after crimping, and then cut, or a can A method of crimping and cutting after processing is employed.
  • the process is temporarily stopped and the production efficiency is lowered, and in addition, the thread guide becomes complicated by guides and rollers in the middle, and quality defects are likely to occur.
  • the remaining raw yarn at the end of production due to variations in the yarn length and the tow of scrap handling are likely to occur, and there is a problem in terms of yield.
  • the spun fiber is temporarily stored in the state of tow or the like, it is required to impart convergence to the fiber for process stability, and a spinning oil with high convergence can be used in the spinning stage. is necessary.
  • a highly convergent oil agent may inhibit the dispersibility of the short fiber as the final product in water.
  • short fibers for papermaking are required to have excellent reinforcing effects and excellent dispersibility in water, and the conventional manufacturing method has not yielded short fibers with sufficient quality.
  • the traveling speed of the drawn fiber tow is 130 to 6,000 m / min, and the finishing oil agent is applied to the synthetic fiber tow by spraying immediately after the heat treatment to give the crimp to the synthetic fiber tow.
  • a method for producing a synthetic fiber tow is disclosed.
  • the present invention has been made based on the above background, and it is an object of the present invention to provide a method for more efficiently producing an uncrimped short fiber excellent in water dispersibility.
  • the method for producing an uncrimped short fiber according to the present invention is a method for producing an uncrimped short fiber in which spinning is performed at a spinning speed of 600 m / min or more and the fiber tow is cut to a length of 35 mm or less at a speed higher than the spinning speed.
  • the cutting speed is preferably in the range of 600 to 4,000 m / min.
  • the said cut is a method cut
  • the fiber tow is preferably 1000 dtex or more.
  • the hydrophilic oil agent is preferably an oil agent containing a polyalkylene glycol derivative.
  • the step of applying the hydrophilic oil agent uses a liquid application device including a curved portion having an arc shape in a cross-sectional view, and the fiber tow is caused to travel while being in contact with the curved portion. It is preferable to include a step of discharging the liquid oil agent to the fiber tow.
  • a liquid applying apparatus including a flat portion and providing an opening region in a part of the flat portion, and having the opening portion (liquid discharge hole) in the opening region. And using the fiber tow to discharge the liquid from the aperture and apply the fiber tow to the fiber tow while traveling above and / or below the aperture area so as not to contact the flat portion. Is preferred.
  • the uncrimped short fibers are preferably undrawn. Furthermore, the birefringence of the unstretched short fibers is preferably in the range of 0.001 to 0.100. Furthermore, it is preferable that the tension of the fiber tow in each step before the cutting of the fiber tow is less than the yield tension.
  • the present invention also provides an aqueous dispersion obtained by mixing the unstretched uncrimped short fibers obtained by the above-described method and the stretched short fibers as a main raw material with a wet nonwoven fabric manufacturing apparatus and hot pressing. A non-woven fabric is provided.
  • uncrimped short fibers excellent in water dispersibility can be produced more efficiently.
  • the method for producing an uncrimped short fiber according to the present invention is a method for producing an uncrimped short fiber in which spinning is performed at a spinning speed of 600 m / min or more and the fiber tow is cut to a length of 35 mm or less at a speed higher than the spinning speed.
  • the polymer used for the production of the uncrimped short fiber may be a polymer made of a synthetic resin that is discharged from a spinneret to form a fiber.
  • aromatic polyesters such as polyethylene terephthalate and polyethylene naphthalate
  • aliphatic polyesters such as polylactic acid
  • aliphatic polyamides such as polyamide 6 and polyamide 66
  • polyparaphenylene terephthalamide and polymetaphenylene isoform.
  • Aromatic polyamides such as phthalamide, polyolefins such as polyethylene and polypropylene, polyacrylonitriles, vinylon, polyphenylene sulfide, etc. can be selected according to the intended use.
  • a polyester resin as such a fiber moldable polymer.
  • polyester resins include polyesters composed of aromatic dicarboxylic acids and aliphatic diols such as polyalkylene terephthalates such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyalkylene naphthalates such as polyethylene naphthalate.
  • polyalkylene terephthalates such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyalkylene naphthalates such as polyethylene naphthalate.
  • Neopentyl glycol, 1,4-cyclohexanedimethanol, polyalkylene glycol, and the like may be copolymerized in one or more components.
  • the polymer structure may be branched by copolymerizing three or more carboxylic acid components such as pentaerythritol, trimethylolpropane, trimellitic acid, trimesic acid, or components having a hydroxyl group.
  • carboxylic acid components such as pentaerythritol, trimethylolpropane, trimellitic acid, trimesic acid, or components having a hydroxyl group.
  • 85 mol% or more, preferably 95 mol% or more of all repeating units is a polyester composed of ethylene terephthalate.
  • a copolymerization component other than the terephthalic acid component and the ethylene glycol component it is preferable to use a small amount of a copolymerization component of 15 mol% or less based on the terephthalic acid component.
  • the intrinsic viscosity of the raw material polyester is preferably in the range of 0.30 to 1.50 dL / g, more preferably 0.40 to 1.20 dL / g.
  • the intrinsic viscosity can be adjusted by a method in which a polymer once formed into a chip shape is further subjected to solid phase polymerization by a drying process.
  • known additives such as pigments, dyes, matting agents, antifouling agents, antibacterial agents, deodorants, fluorescent whitening agents, flame retardants, stabilizers are added to the fiber-forming polymer used in the present invention.
  • an ultraviolet absorber, a lubricant and the like may be contained.
  • a spinning solution obtained by melting or dissolving a fiber-forming polymer as described above is discharged from a spinneret having a plurality of discharge holes, solidified, spun, and unstretched. Multifilament.
  • the spinning speed is 600 m / min or higher.
  • the upper limit of the spinning speed is preferably 3000 m / min or less, more preferably 800 to 2700 m / min, and particularly preferably 900 to 2500 m / min.
  • the spinning device it is preferable to use a melt spinning device equipped with a screw type extruder.
  • the spinning speed is too low, the molecular orientation in the undrawn yarn after spinning tends to be small, and as a result, embrittlement is likely to occur due to crystallization over time, and the physical properties of the resulting short fibers may be reduced.
  • the spinning speed is too high, the physical properties of the fiber are improved, but orientation crystallization on the spinning line is promoted, and the amorphous portion tends to decrease.
  • the adhesive performance of the wet nonwoven fabric after papermaking tends to be reduced.
  • a hydrophilic oil agent in one or more steps from undrawn multifilaments immediately after spinning to before cutting of fiber tows.
  • at least one point is applied immediately after spinning until the multifilament is converged and before the heat treatment from the drawing heat treatment to before cutting the fiber tow.
  • the hydrophilic oil agent is preferably a polyalkylene glycol derivative, and particularly preferably a polyether / polyester copolymer. More specifically, a polyether / polyester copolymer comprising terephthalic acid and / or isophthalic acid, lower alkylene glycol and polyalkylene glycol and / or a monoether thereof is preferable.
  • Preferred lower alkylene glycols include ethylene glycol, propylene glycol, and tetramethylene glycol.
  • examples of the polyalkylene glycol include polyethylene glycol having an average molecular weight of 600 to 6000, a polyethylene glycol / polypropylene glycol copolymer, and polypropylene glycol.
  • examples of the monoether of polyalkylene glycol include monomethyl ether such as polyethylene glycol and polypropylene glycol, monoethyl ether, and monophenyl ether.
  • the copolymer preferably has a molar ratio of terephthalate units to isophthalate units in the range of 95: 5 to 40:60 from the viewpoint of dispersibility in water.
  • alkali metal salts such as sulfoisophthalic acid, adipic acid, sebacic acid, etc. May be copolymerized in a small amount.
  • the average molecular weight of the polyether / polyester copolymer comprising the above components is usually 1000 to 20000, preferably 3000 to 15000, although it depends on the molecular weight of the polyalkylene glycol used. If the average molecular weight is too low, the effect of improving the dispersibility in water is reduced. On the other hand, if the average molecular weight is too high, the emulsification property of the polymer is reduced.
  • a hydrophilic oil agent such as a polyalkylene glycol derivative
  • the hydrophilic oil agent can usually be easily dispersed in water by a stirring process or the like.
  • a small amount of a surfactant or an organic solvent may be added, and it is also preferable to use a mixture of various treatment agents such as other oil agents. is there.
  • a method such as spraying, roller touch (kiss roll), metering oil (a method for applying a fixed amount of oil to a ceramic guide having a hole with a gear pump or the like) as a method for attaching the hydrophilic oil.
  • a method such as spraying, roller touch (kiss roll), metering oil (a method for applying a fixed amount of oil to a ceramic guide having a hole with a gear pump or the like) as a method for attaching the hydrophilic oil.
  • the method for producing crimped short fibers of the present invention it is preferable to apply a hydrophilic oil agent in the spinning step immediately after being discharged from the spinneret.
  • a hydrophilic oil agent in particular, the case of undrawn uncrimped short fibers is preferably effective.
  • Conventionally, in the process of producing short fibers there has been a process of collecting cans after spinning, so there is a problem that multifilaments are scattered, and it is necessary to use a highly convergent oil agent. The required dispersibility in water was not sufficient. However, by omitting the canning process etc.
  • hydrophilic oil agent without binding the fiber tows after the molten polymer discharged from the die is cooled and solidified. While shortening processing time, it becomes possible to provide a hydrophilic oil agent uniformly to the fiber surface.
  • a hydrophilic oil agent such as a polyalkylene glycol derivative
  • it is more effective on the surface of each single fiber than in the conventional case of imparting after being bundled. Ingredients are easy to spread. Therefore, the said component adheres enough to the fiber surface and the effect which suppresses significantly the non-dispersion in water is acquired.
  • a hydrophilic oil as a spinning oil, it is preferably an aqueous emulsion in the production method of the present invention.
  • the emulsion concentration of the polyalkylene glycol derivative is preferably in the range of 0.5 to 3% by mass.
  • the adhesion amount of the emulsion to the unstretched fiber immediately after spinning is preferably 5 to 50% by mass, and particularly preferably 10 to 30% by mass.
  • the adhesion amount of the hydrophilic oil to the undrawn fiber or drawn fiber is preferably 0.1 to 3% by mass, more preferably 0.2 to 2.5% by mass, based on the mass of the undrawn fiber or drawn fiber. More preferably, it is in the range of 0.5 to 1.5% by mass.
  • the amount of adhesion is too small, the dispersion of fibers in water tends to be insufficient in the subsequent paper making process or the like.
  • the amount of adhesion becomes too large, the adhesion between fibers tends to be inhibited.
  • the water quality load on the papermaking process circulation water tends to increase.
  • undrawn multifilaments to which a hydrophilic oil agent has been applied after discharging the spinneret as described above are used as they are or bundled together to form a fiber tow of 1000 dtex or more. It is preferable to discharge multifilaments of 1000 to 50000 dtex, particularly 2000 to 20000 dtex from one spinneret. More preferably, 2 to 40 or more, particularly 3 to 30 multifilaments are bundled to form a fiber tow of 2000 to 100000 dtex, particularly 3000 to 50000 dtex after the combined yarn.
  • the total number of filaments in the final fiber tow in which such short fibers are aggregated is preferably in the range of 500 to 100,000, particularly 100 to 90,000 so that the total fineness is achieved.
  • the fineness of the single yarn constituting the uncrimped short fiber obtained in the present invention is preferably 0.001 to 100 dtex, preferably 0.1 to 30 dtex.
  • the uncrimped short fibers obtained by the production method of the present invention are used for papermaking, such a single yarn fineness enables more efficient production. If the single yarn fineness is too thin, the spinnability at the time of spinning tends to be reduced, and if the single yarn fineness is too thick, cooling after spinning tends to be difficult.
  • the cross-sectional shape of the uncrimped short fiber obtained by the present invention is not particularly limited, and may be an elliptical cross section, a multi-leaf cross section such as a 3-8 leaf cross section, or an irregular cross section such as a 3-8 octagonal cross section in addition to a round cross section. It is also preferable that there is. Moreover, it is not restricted to a solid fiber, It is also preferable that they are a hollow fiber and a composite fiber. Examples of the composite form in the case of a composite fiber include a core-sheath type, an eccentric core-sheath type, a side-by-side type, a sea-island type, and a segment pie type.
  • an unstretched multifilament to which an oil agent containing a polyalkylene glycol derivative is applied is used as it is or bundled into a fiber tow, continuously without collecting, and a surface temperature of 80 ° C. or less.
  • the stretching treatment can be performed at a temperature of less than 240 ° C.
  • the temperature of the stretching treatment is preferably controlled to be less than 240 ° C., more preferably in the range of 140 to 220 ° C.
  • the unstretched fiber is preferably wound by 2 to 10 turns around a pair of rollers, and is stretched in 2 to 10 stages between a plurality of Nelson type rollers whose speed is changed.
  • the draw ratio is preferably greater than 1 and less than 5 times between each pair of rolls, and the overall magnification is preferably 1.5 to 5.0 times.
  • the fiber tow is cut at a speed higher than the spinning speed.
  • the unstretched fiber tow made of unstretched multifilaments is temporarily stored in a tow can, or manufactured in a crimping process. After reducing the speed, etc., it is subjected to a low-speed cutting process.
  • the present invention is a method for producing uncrimped short fibers characterized by eliminating extra steps such as collecting cans and crimping and continuously cutting fiber tows.
  • a polyalkylene glycol derivative necessary for dispersibility in water specifically, a hydrophilic oil agent such as an aqueous emulsion of a polyether / polyester copolymer may be added.
  • a hydrophilic oil agent such as an aqueous emulsion of a polyether / polyester copolymer
  • the oil agent application in the stretching step and other steps can be omitted, and a continuous process is easy.
  • a hydrophilic oil agent is applied in the spinning step, it is difficult to use a hydrophilic oil as a spinning oil because of low friction and insufficient convergence. By omitting the can collecting process, it became possible to use a hydrophilic oil as a spinning oil.
  • the obtained short fibers are not crimped, so that entanglement in water is prevented. And the continuous process is easy also from the point that the crimper process for crimping is omitted.
  • the unstretched tow provided with a liquid immediately after spinning is fed from a spinning machine to a cutter (high-speed cutter) through a stretching process as necessary. And by continuously processing, it becomes possible to shorten the process, and single yarn breakage due to yarn guide scratches in the guides and rollers in the middle and convergence failure in single yarn or sub-tow units occur. This makes it possible to reduce the occurrence of excessive length fibers (fiber length longer than the setting).
  • the fiber tow bends (Giaryl), or even if it does not bend, a single yarn saliva or loop may occur (Ejector). Further, when collecting cans, fiber tow (raw yarn) may be entangled or pulled, and single yarn flakes (salach) may occur.
  • the production method of the crimped short fiber of the present invention is a continuous cutting process, and at this time, it is cut to a length of 35 mm or less at a speed higher than the spinning speed.
  • the cutting speed of the fiber tow in the cutting step is preferably higher than the spinning speed and higher than the spinning speed in the present invention.
  • the cutting speed of the fiber tow in the cutting step is higher than the spinning speed of 600 m / min or more, preferably 800 m / min or more, more preferably 900 m / min or more, and preferably 4 3,000 m / min or less, more preferably 3,500 m / min or less, even more preferably 3,000 m / min or less, and particularly preferably 2700 m / min or less.
  • the uncrimped short fiber of this invention for example, when manufacturing a drawn short fiber, it is preferable to provide water to the drawn fiber tow that has been drawn and heat-treated as necessary.
  • water By applying water, it is possible to prevent the fibers from scattering after being cut, and to reduce the bulk at the time of packaging. Moreover, penetration of water between fibers during papermaking can be promoted, and dispersibility in water can be improved.
  • the moisture content at this time is preferably 0.5 to 35% based on the fiber mass, more preferably 0.5 to 20%, further 2 to 15%, and particularly preferably less than 15%. preferable.
  • the alkylene glycol derivative to be imparted may be the same as or different from that used at the time of spinning.
  • the manufacturing method of this invention does not give crimp, but it supplies to a high-speed cutter, and cuts to predetermined fiber length.
  • it is preferable to control the toe tension in order to prevent the occurrence of excessively long fibers due to slack.
  • a known technique such as an automatic control by a dancer roller or a load cell, or a balancer used in a high-speed winder can be applied.
  • the cut length of the production method of the present invention is 35 mm or less, but particularly when the short fiber obtained by the production method of the present invention is used for papermaking, the fiber length is 1 to 30 mm or less, It is preferably in the range of 1 to 20 mm, particularly 2 to 10 mm.
  • the fiber length is preferably 30 mm or less.
  • the fiber length is preferably 20 mm or less, particularly 10 mm or less.
  • the fiber length is too short, the distance between the cutter blades is reduced, so that the cutting resistance at the time of manufacture in the space formed between the blades is increased, so that the fibers are stretched or the single fibers are It tends to be entangled and tends to lead to a decrease in quality. For example, interfiber sticking occurs and stable cutting tends to be difficult.
  • the fiber mass tends to increase in the obtained fiber, and particularly when used for papermaking, the dispersibility in water tends to deteriorate.
  • the cut has a plurality of cutter blades, and the distance between the cutter blades is the same or longer than the cutting surface of the cutter blade to the back surface.
  • a method of cutting with a fiber cutter is preferred.
  • a normal rotary cutter has a plurality of cutter blades
  • the interval between the cutter blades is gradually narrowed from the cutting surface to the back surface of the cutter blade. This is because the blade is arranged facing the outside of the rotary on which the cutter blade is arranged, the fiber tow is wound around the outside of the rotary, and the cut fiber is discharged from the center of the rotary. In such an apparatus, it is very difficult to ensure a processing speed of 600 m / min or more.
  • a general-purpose rotary cutter as described in Utility Model Registration No. 3103190 is the most commonly used in the industry for cutting fiber tows (long fiber bundles) into short fibers. .
  • the distance between the blades gradually decreases toward the discharge after cutting, and the discharge resistance of the cut fibers increases.
  • a short fiber cutter in which the interval between the cutter blades is the same or longer than the cutting surface of the cutter blade to the back surface (hereinafter, sometimes referred to as a high-speed cutter).
  • a cutter for short fibers having a mechanism described in US Pat. No. 4,577,537 and US Pat. No. 4,528,880.
  • the fiber tow can be easily cut even at a speed exceeding 600 m / min without an increase in discharge resistance as in a normal rotary cutter.
  • the mechanism is to arrange the cutter blades radially, but to cut the fiber tow installed further upward while winding the fiber tow around the rotating rotor placed above it so that the cutting side faces upward. This is a method of gradually pushing through with an inclined ring. Since the distance between the blades from the cutting surface of the cutter blade to the back surface (cut fiber discharge side) is constant, it is possible to suppress an increase in discharge resistance, and the fiber tow is cut at a high speed of 3000 m / min or more. Moreover, generation
  • the non-crimped short fiber obtained by the production method of the present invention is a hydrophilic non-crimped short fiber excellent in water dispersibility, in which an oil agent is uniformly applied to the fiber surface, and becomes undispersed. It is difficult to produce short fibers that are particularly suitable for papermaking. And in the manufacturing method of this invention, it becomes possible to manufacture such an uncrimped short fiber efficiently.
  • this uncrimped short fiber can be suitably used for various living materials and industrial materials by processing it into a wet nonwoven fabric or the like.
  • a short fiber can be obtained by performing unstretched or stretched after spinning depending on the purpose.
  • the tension of the undrawn yarn (fiber tow) before and after the cutter process is important, and in particular, the tension of the undrawn yarn (fiber tow) before the cutter is limited to the limit where neck stretching of the undrawn yarn does not occur. is important.
  • the tension is preferably adjusted to 1% to 95% of the tension at which neck stretching occurs, and particularly preferably adjusted to 2% to 90%.
  • the tension at which neck stretching occurs can be determined by measuring the undrawn yarn's load-drawing curve off-line with a tensile strength tester, determining the yield stress before neck stretching, and comparing it with the tension. It is.
  • a conceptual diagram of the yield stress ( ⁇ y) of the undrawn yarn is shown in FIG.
  • the pre-cutter tension is too small, the fiber tow becomes slack inside the high-speed cutter, and excessively long fibers are generated. On the contrary, if the pre-cutter tension is too high, partial neck stretching starts due to slight fluctuations in the process tension, and uniform short fibers cannot be obtained. When such non-uniform short fibers are used especially in the papermaking field, the binder performance and fiber diameter vary, which causes a decrease in adhesion performance and dimensional stability, and papermaking texture disturbance. In order to control the pre-cutter tension (toe tension), it is necessary to apply known techniques such as automatic control using a dancer roller or load cell, a balancer used in a high-speed winder, and a cutter speed higher than the pre-cutter supply speed. Is preferred.
  • the birefringence index of the undrawn short fiber is 0.001. It is preferably in the range of ⁇ 0.100. Furthermore, although the appropriate range varies depending on the resin, for example, when a polyester resin is used, it is preferably in the range of 0.005 to 0.090, particularly 0.010 to 0.080.
  • Birefringence indicates the molecular orientation of unstretched fibers, especially when it is used as unstretched binder fibers for paper applications, greatly affects binder adhesion performance and paper strength, and greatly affects the bonding temperature and pressure conditions in the intermediate process. It is a physical property.
  • the birefringence of the undrawn non-crimped short fiber can be adjusted by the spinning speed and the spinning draft rate.
  • the spinning speed is preferably in the range of 700 to 3000 m / min in the case of undrawn short fibers. If the spinning speed is low, the molecular orientation in the undrawn yarn is small, so that embrittlement is likely to occur due to crystallization over time, which becomes a defect, and the paper strength when undrawn short fibers are reduced or varies. Is seen. On the other hand, if the spinning speed is too high, oriented crystallization occurs on the spinning line, and the adhesion performance of the post-paper nonwoven fabric, which is controlled by the amorphous part, is deteriorated.
  • the unstretched uncrimped short fibers obtained by the production method of the present invention preferably have a moisture retention of 3 to 40% by mass, particularly when used as a binder fiber for papermaking. If the water retention rate is too low, the hydrophilic oil film formed on the fiber surface is less likely to fall off the fiber surface during the paper making process, causing adhesion failure and decreasing paper strength. It is in. On the other hand, when the moisture retention rate is too high, water scattering increases in the cutting step, making it difficult to stably cut the fiber. Further, the mass of the obtained unstretched fiber increases, which is uneconomical from the viewpoint of transportation cost.
  • the undrawn non-crimped short fibers obtained by the production method of the present invention are undrawn short fibers excellent in water dispersibility and thermal adhesiveness, and are particularly suitable for papermaking binders. It becomes. And in the manufacturing method of this invention, it becomes possible to manufacture such an undrawn short fiber efficiently.
  • the part where the fiber tow comes into contact is formed of a curved part having an arc shape in a sectional view.
  • An opening region is provided in a part of the curved portion, and a liquid application device having an opening portion (liquid discharge hole) in the opening region is used.
  • a fiber tow is held in the opening region at a holding angle larger than 20 °.
  • the liquid is ejected from the aperture and applied to the fiber tow while contacting and running so as to be smaller than 180 °.
  • the curved portion having an arc shape has an apex (FIG. 2-g) upward (FIG. 3), that is, a pattern in the antigravity direction (the curved portion is It can be in any orientation in which the apex of the curved portion is downward (FIG. 4), that is, a pattern in the direction of gravity (the curved portion is brought into contact with the upper side of the fiber tow).
  • the effect of the present invention is exhibited even when the apex of the curved portion is upward.
  • the liquid application rate tends to increase, and the effect of liquid application becomes more prominent as the fiber tow becomes faster.
  • the bending portion may be brought into contact with the fiber tow while being inclined with respect to the tangent line of the apex (FIG. 3-g) of the bending portion within a range that does not affect the effect of the present invention. That is, the traveling direction of the fiber tow may be inclined (blur) in a range where the liquid application does not affect the tangent to the curved portion. 2 and FIG. 3 (pattern in which the curved portion faces upward), it is composed of a curved portion (FIG. 2-a) having a plurality of apertures (FIG. 2-b), and liquid is supplied from the apertures. This is performed using the ejected liquid application device (FIG. 2).
  • the curved portion (FIG.
  • step e) is a curved surface having an arc shape in a cross-sectional view, and the holding angle adjusting portion (FIG. 3-) is adjusted so as to have a predetermined holding angle (FIG. 3- ⁇ ) along the curved surface.
  • step e) the fiber tow is adjusted and fixed, and the fiber tow is brought into contact with the aperture region (FIG. 2-c) in a planar shape. At this time, the liquid can be penetrated into the fiber tow by discharging the liquid from the opening (FIG. 2-b).
  • the shape and formation method of the opening includes punching plate shape by press punching, wire winding with a holed wire wound, mesh shape formed by wire knitting, etc. Can be appropriately selected.
  • a wire wound by winding a wire with a hole is preferable.
  • the hole shape of the aperture is not particularly limited, and a circle, an ellipse, a semicircle, a triangle, a quadrangle, a polygon, a linear slit, and the like can be selected as appropriate. Are formed with holes.
  • the material of the curved portion may be selected appropriately as long as it can withstand the corrosion and wear caused by the oil emulsion, and examples include anodized aluminum and stainless steel (SUS-304, SUS-316, etc.). be able to. Processing may be performed on the material constituting the bending portion so that the liquid film is uniformly formed on the surface of the bending portion by the discharged liquid. In addition, in order to prevent fibers from being taken into the aperture region (FIG. 2-c) when contacted, a friction reducing process such as a satin finish may be performed.
  • the radius of curvature of the arc shape (FIG.
  • 3-f is preferably 30 to 300 mm, more preferably 50 to 200 mm, although it depends on the traveling speed of the fiber tow. If it is smaller than 30 mm, sufficient contact time cannot be obtained even if the holding angle (FIG. 3- ⁇ ) is increased. If it is larger than 300 mm, the area of the aperture region becomes too large with respect to the contact area of the fiber tow, so that the efficiency is lowered and the running cost is increased.
  • the hole area ratio is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less, when defined as a value obtained by dividing the total area of the opening part by the area of the opening region and multiplying by 100.
  • the most preferable content is 1% or less. If it is larger than 10%, the discharge pressure cannot be secured and adhesion spots are likely to occur.
  • the lower limit of the open area ratio is preferably 0.01%, more preferably 0.03%, and even more preferably 0.05%. When the open area ratio is smaller than 0.01%, it becomes difficult for the liquid to adhere uniformly.
  • the liquid application device (FIG. 2) can be brought into contact with the fiber tow in a planar shape by forming an arc shape in a cross-sectional view, and the contact time can be ensured.
  • the liquid By being pressed at a predetermined holding angle, the liquid is thinly spread in the width direction, and at the same time, the liquid supplied from the opening portion easily penetrates into the fiber tow.
  • the holding angle when the fiber tow is brought into contact with the arc-shaped curved portion is larger than 20 ° and smaller than 180 °, preferably larger than 30 ° and smaller than 160 °, more preferably larger than 30 ° and smaller than 150 °.
  • the angle is less than 20 °, the fiber tow does not spread sufficiently in the width direction, the liquid cannot penetrate into the fiber tow, and the contact time is insufficient, so that a sufficient liquid adhesion rate cannot be obtained.
  • the angle is 180 ° or more, the fiber is taken out at the time of contact and single yarn breakage is likely to occur, and entanglement occurs when dispersed in water.
  • the same tendency can be said in FIG. 4, that is, in the pattern in which the curved portion is directed downward.
  • the flow rate discharged from the aperture it is necessary for the flow rate discharged from the aperture to be 0.2 m / second or more to uniformly penetrate the single yarn inside the fiber tow running at a high speed.
  • the liquid discharge flow rate is less than 0.2 m / sec, the liquid (oil agent emulsion solution) is less likely to penetrate into the fiber tow where the single yarn is tightly packed, and the dispersion of the short fibers in the water tends to be uneven.
  • the range of the preferred flow rate is 0.3 to 5.0 m / second, more preferably 0.7 to 3.0 m / second.
  • the contact time (seconds) when the fiber tow is brought into contact with the curved portion of the liquid applicator is 0.001 to 0.05 seconds, preferably 0.002 to 0.01 seconds. If it is shorter than 0.001 seconds, it is difficult to obtain a sufficient amount of oil agent applied, and if it is longer than 0.05 seconds, the amount of adhesion becomes excessive and the scattering of the liquid increases.
  • the means for adjusting is not particularly limited, and a nip roller that grips the fiber tow with a constant gripping pressure by a pair of rollers can be exemplified. By adjusting the pressure gripped by the nip roller, the adhesion rate of the liquid to the fiber tow can be controlled.
  • the portion through which the fiber tow passes is composed of a flat portion, and a liquid applying device having an opening (liquid discharge hole) in the flat portion is used, and the fiber tow is caused to travel so as not to contact the opening region. Then, the liquid is discharged from the aperture and applied to the fiber tow.
  • the plane portion is composed of a plurality of aperture portions (liquid ejection holes) (FIG. 5-aa) included in the aperture region, and a liquid application device (FIG. 5) that ejects liquid from the aperture portions. Use to do.
  • the fiber tow is allowed to pass through without contacting the upper side and / or the lower side of the open area (area with liquid ejection holes, FIG. 5-aa). At this time, the liquid can be applied to the fiber tow without damaging the fiber by positively discharging the liquid from the aperture (FIG. 5-aa).
  • the shape and forming method of the opening are punching plate shape by press punching, wire winding wound with a holed wire, mesh shape formed by wire knitting, Or a nonwoven fabric-like thing etc. can be selected suitably.
  • the hole shape of the opening portion is not particularly limited, and a circular shape, an elliptical shape, a semicircular shape, a triangular shape, a quadrangular shape, a polygonal shape, a linear slit, or the like can be selected as appropriate, and the opening portion is formed by a plurality of holes. .
  • the material of the open area (Fig. 5-aa) can be selected appropriately as long as it is resistant to corrosion and wear due to the oil emulsion. Examples include aluminum and stainless steel (SUS-304, SUS-316, etc.) that have been anodized. can do.
  • the hole area ratio is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less, when defined as a value obtained by dividing the total area of the opening part by the area of the opening region and multiplying by 100.
  • the most preferable content is 1% or less. If it is larger than 10%, the discharge pressure cannot be secured and adhesion spots are likely to occur.
  • the lower limit of the open area ratio is preferably 0.01%, more preferably 0.03%, and even more preferably 0.05%. When the open area ratio is smaller than 0.01%, it becomes difficult for the liquid to adhere uniformly.
  • a liquid can be provided to a fiber tow, without making a liquid application apparatus (FIG. 5) contact with a fiber tow. There are few fiber damages and thread breakage, and good quality fibers can be obtained.
  • the opening area and the opening portion of the liquid applicator may be upward or downward. Either the upward (FIG. 6-ff) or downward (FIG. 6-gg) liquid applicator may be installed, or the upward and downward liquid applicators may be used together, and the fiber tow is viewed from above and below on the flat surface. You may install so that it may pinch
  • the liquid applicator is installed so as to be sandwiched between the upper and lower sides, the liquid can be applied more uniformly by discharging the liquid from both sides of the fiber tow.
  • the distance (h) between the opening portion and the traveling fiber tow is preferably in the range of 5 to 200 mm, more preferably 10 to 100 mm. When the distance between the aperture and the fiber tow is shorter than 5 mm, workability is deteriorated. If the distance is more than 200 mm, it becomes difficult for the discharged liquid to be applied to the fiber tow, resulting in poor liquid adhesion efficiency.
  • the flow rate discharged from the aperture it is necessary for the flow rate discharged from the aperture to be 0.2 m / second or more to uniformly penetrate the single yarn inside the fiber tow running at a high speed.
  • the liquid discharge flow rate is less than 0.2 m / sec, the liquid (oil agent emulsion solution) is less likely to penetrate into the fiber tow in which the single yarn is densely packed, and the dispersion of the short fibers in the water tends to be uneven.
  • the range of the preferred flow rate is 0.3 to 5.0 m / second, more preferably 0.7 to 3.0 m / second. Further, the passing time for the fiber tow to travel through the opening area (FIG.
  • the liquid applicator is 0.001 to 0.05 seconds, preferably 0.002 to 0.01 seconds. If it is shorter than 0.001 seconds, it is difficult to obtain a sufficient amount of oil agent applied, and if it is longer than 0.05 seconds, the amount of adhesion becomes excessive and the scattering of the liquid increases.
  • the area of the flat portion can be appropriately selected depending on conditions such as the traveling speed of the fiber tow and the width of the fiber tow.
  • the length (FIG. 5-bb) in the traveling direction of the fiber tow in the open area (FIG. 5-aa) needs to be set so as to ensure the above-described passage time (seconds).
  • a plurality of the liquid applying devices may be installed in the traveling direction of the fiber tow.
  • the passage time in that case is a time obtained by adding the passage times of the respective liquid application devices.
  • the width of the aperture region (FIG. 5-cc) needs to be wider than the width of the fiber tow (FIG. 5-ee). If the aperture area is narrower than the width of the fiber tow, liquid adhesion spots tend to occur in the width direction of the fiber tow, which is not preferable.
  • the means for adjusting is not particularly limited, and a nip roller that grips the fiber tow with a constant gripping pressure by a pair of rollers can be exemplified. By adjusting the pressure gripped by the nip roller, the adhesion rate of the liquid to the fiber tow can be controlled.
  • the short fiber moisture content is preferably 3 to 40% based on the short fiber mass, and more preferably 5 to 35%.
  • the oil agent adhesion rate is preferably 0.05 to 1.0%, more preferably 0.1 to 0.8%, based on the fiber mass. By setting it as this range, functional liquids, such as an oil agent, can osmose
  • a method for applying a liquid to a fiber tow a method of immersing the fiber tow in a liquid bath, a method of applying with an oiling roller, a method of applying with a shower or spray, and the like can be mentioned.
  • the method of immersing the fiber tow in the liquid bath is difficult to apply under the condition that the fiber tow travels at a high speed and the liquid scatters significantly.
  • the amount of liquid film formed on the roller surface is limited. Is done. In particular, when the fiber tow is thick and the traveling speed is high, sufficient liquid cannot be applied.
  • the method of applying by spraying or showering has a limitation in the amount of liquid applied when the running speed of the fiber tow is fast, and the liquid adheres only to the surface layer part of the fiber tow. An additional process such as allowing the liquid in the surface layer to permeate into the fiber tow by means such as gripping with a screw is required. Furthermore, when spraying a liquid with a spray, there is a problem that a liquid having a high viscosity cannot be applied or the spray hole is blocked when the use time is long.
  • liquid application method in the method for producing short fibers of the present invention can sufficiently apply liquid even in high-speed running of the fiber tow, the above-mentioned general liquid application method can be solved. It becomes possible to obtain short fibers with good dispersibility in water in the paper making process.
  • the method for producing an uncrimped short fiber of the present invention is a production method in which spinning, liquid application, and cutting are performed in a continuous process. Between spinning and cutting, depending on the purpose, unstretched or stretched can be used to obtain short fibers. When stretched (see FIG. 7), it is preferable in terms of physical properties and useful as a main fiber, and when not stretched, it is useful as an unstretched binder fiber. It is also possible to produce a wet nonwoven fabric using the main fiber of the present invention and the unstretched binder.
  • the present invention continuously stretches a fiber tow in which one or a plurality of unstretched multifilaments after spinning are converged without collecting them, and continuously imparts a functional agent such as an oil agent if necessary.
  • the short fiber manufacturing method is carried out by a process of continuous cutting with a high-speed cutter. In such a process, it is necessary to uniformly apply an oil agent to a fiber tow that travels at a high speed and has a high fineness.
  • the fiber tow bends (Giaryl), or even if it does not bend, a single yarn saliva or loop may occur (Ejector). Further, when collecting cans, fiber tow (raw yarn) may be entangled or pulled, and single yarn flakes (salach) may occur. In the continuous production method according to the present invention, it is possible to reduce such defects, and the obtained short fibers have a uniform single yarn length.
  • the short fiber obtained by the production method of the present invention is a short fiber in which a liquid such as an oil emulsion is uniformly applied to the fiber, and the functional component is uniformly applied to the fiber.
  • a liquid such as an oil emulsion
  • the functional component is uniformly applied to the fiber, the spots are reduced, and the quality is excellent.
  • the manufacturing method of this invention it becomes possible to manufacture such a short fiber efficiently.
  • These short fibers can be suitably used for various living materials and industrial materials by processing them into wet nonwoven fabrics, dry nonwoven fabrics and the like.
  • a fiber tow obtained by converging one or a plurality of unstretched multifilaments after spinning is continuously stretched without collecting the can, After stretching at a surface temperature of at least one of the rollers of 120 ° C. or less and a total stretching ratio of 1.5 to 5.5 times, overfeed is performed, and at least one of the rollers at the time of the overfeed It is also possible to perform overfeeding at a surface temperature of 140 to 240 ° C. and a total draft ratio of 0.88 to 0.98 and continuously cut the stretched tow into a length of 1 to 35 mm.
  • the surface temperature of the stretching roller is 120 ° C. or less, preferably 100 ° C. or less. be able to.
  • the lower limit of the drawing roller is preferably room temperature or higher (from 15 ° C.), more preferably 30 ° C. or higher, and further preferably 50 ° C. or higher.
  • continuous overfeed can be performed.
  • the surface temperature of the drawing roller is higher than 120 ° C., the fibers are stuck together or the fibers are blown during drawing.
  • the stretching temperature is low, sufficient stretching and uniform stretching may not be possible.
  • Stretching can be performed between a plurality of heating rollers having different speeds.
  • the stretching can be performed in any of a range of 2 to 10 steps between a plurality of Nelson-type rollers wound around a pair of rollers for 2 to 10 turns and changed in speed.
  • the stretching ratio of the stretching process is preferably greater than 1 and less than 5.5 times between each pair of rolls, and the total stretching ratio is preferably 1.5 to 5.5 times.
  • fiber tows formed by converging one or a plurality of undrawn multifilaments after spinning are continuously supplied to the drawing process without collecting cans.
  • the roller surface temperature is 140 ° C. or higher and 240 ° C. or lower, preferably 160 ° C. or higher and 220 ° C. or lower.
  • the roller surface temperature is 140 ° C. or higher and 240 ° C. or lower, preferably 160 ° C. or higher and 220 ° C. or lower.
  • overfeeding can be performed by winding 2 to 10 turns around a pair of rollers. Furthermore, it is necessary to perform overfeeding between the rollers simultaneously with the heat treatment at this time. By performing overfeed, the molecular orientation can be relaxed, the thermal shrinkage rate of the fiber can be suppressed, and the initial elastic modulus of the fiber can be reduced.
  • Overfeeding can be performed by setting the upstream speed of the Nelson type roller faster than the speed of the downstream roller. That is, when the peripheral speed V1 ⁇ ⁇ m / min of the upstream (spinning side) roller pair and the peripheral speed of the downstream roller pair is V2 m / min, V1 is set larger than V2.
  • V2 / V1 is defined as “draft ratio”
  • overfeed can be rephrased as making the draft ratio smaller than 1.00.
  • the overfeed may be performed in one stage or in multiple stages, and a product obtained by multiplying the draft ratios of the respective stages is defined as a total draft ratio.
  • the total draft ratio is 0.88 to 0.98, preferably 0.90 to 0.96.
  • the total draft ratio is greater than 0.98, the heat shrinkage rate and the elastic modulus are increased, and satisfactory paper properties upon papermaking cannot be obtained.
  • the total draft ratio is less than 0.88, slack occurs between the rollers, and the fibers are caught on the upstream roller or the slack fibers are introduced into the cutter process, etc. Is a problem.
  • the fiber tow after stretching and overfeeding is preferably cooled before cutting.
  • the means for cooling is not particularly limited, but means such as providing water or an aqueous emulsion to a fiber tow wound on a roller having a surface temperature of 100 ° C. or less, and securing a distance for air cooling before introduction into a cutter, etc. Can be considered.
  • stretching process is cut continuously (refer FIG. 7).
  • the method for producing crimped short fibers of the present invention is characterized in that extra steps such as collecting cans and crimping are eliminated, and processing is performed continuously.
  • the method for producing crimped short fibers of the present invention entanglement of the obtained short fibers in water is prevented. And the continuous process became easy also from the point by which the crimper process for crimping was abbreviate
  • a wet nonwoven fabric made of synthetic fibers can be obtained by mixing the unstretched uncrimped short fibers and stretched uncrimped short fibers of the present invention and thermocompression bonding.
  • the wet nonwoven fabric of the present invention uses stretched uncrimped short fibers as the main fibers and unstretched uncrimped short fibers as the binder fibers.
  • the ratio (mass%) of the main fiber to the binder fiber is 30/70 to 80/20. Deviating from these fiber ratios will deteriorate the physical properties (strength and adhesiveness) of the nonwoven fabric.
  • the unstretched uncrimped short fiber and the stretched uncrimped short fiber are dispersed in water at a mixing ratio that can achieve the desired physical properties such as high elongation and air permeability to obtain a dispersion (slurry) before paper making.
  • natural short fibers other than the short fibers of the present invention wood pulp, abaca, sisal hemp, kenaf, etc.
  • synthetic fibers vinyl short fibers, acrylic fibers, polyolefins such as polyethylene and polypropylene
  • Fibers such as inorganic fibers (such as glass fibers), additives and functional materials are added to the aqueous dispersion depending on the purpose, It may be mixed.
  • the industrial continuous papermaking method is a Yankee dryer using a short fiber wet web obtained by drawing a dispersion liquid on a paper net using a known short net paper machine, long net paper machine, circular knitting paper machine, or a combination thereof. Alternatively, it is heat-dried at 80 to 160 ° C. with an apparatus such as a hot-air perforated tube dryer, and at the same time, temporary melt bonding is performed. Furthermore, in order to obtain sufficient strength of the nonwoven fabric, at least a part between the fibers is subjected to thermocompression bonding by performing hot pressing with a calender roller having a flat surface or an embossing roller having an uneven surface.
  • the temperature and pressure of the hot pressure may be selected depending on the desired physical properties, but generally a temperature of 180 to 250 ° C. is selected.
  • a batch type small paper machine is sufficient, and a square sheet machine such as made by Kumagai Riki Kogyo Co., Ltd. is filled with an aqueous dispersion, mixed, stirred, dehydrated and wet web.
  • the web is heated and dried with a hot roller, a hot plate, or a hot air drier, and then the hot-pressing process as described above may be performed.
  • Intrinsic viscosity [ ⁇ ]
  • o-chlorophenol a predetermined amount of the polymer was weighed and dissolved in o-chlorophenol at 35 ° C. to a concentration of 0.012 g / ml, and then determined according to a conventional method.
  • Total fineness was computed from the following formulas.
  • Total fineness (dtex) ⁇ discharge amount per spindle (g / min) ⁇ number of spinning spindles (plumbing) ⁇ 10000 ⁇ / ⁇ spinning speed (m / min) ⁇ total draw ratio (times) ⁇
  • Moisture content short fiber moisture content, moisture content after cutting
  • Moisture content (%) [(W0 ⁇ W1) / W1] ⁇ 100
  • Oil agent adhesion rate oil emulsion concentration (%) ⁇ water content (%) / 100
  • Dispersibility in water 500 mL of tap water is put into a 1000 mL graduated cylinder, and 0.1 g of short fibers are put into this. When the fiber reaches the bottom of the measuring cylinder, cover the opening of the measuring cylinder, hold the top and bottom with both hands, invert the measuring cylinder once to disperse the fiber, and dispersibility in water according to the following criteria Determine.
  • ⁇ There is no undispersed fiber bundle, and each single fiber spreads neatly in water.
  • ⁇ There is almost no undispersed fiber bundle. Slight entanglement between single fibers is observed, but allowable range x: There are several undispersed fiber bundles, and there are many entanglements between single fibers.
  • Overlong fibers 150 g of short fibers are placed on a black velvet plate, a small amount of cotton is taken out and spread with tweezers, one fiber each longer than the set fiber length (short in some cases; ⁇ 2 mm or more), or Sampling was performed on a population (bundle) and the fiber length was measured.
  • Breaking length paper strength
  • the strength of paper using unstretched fibers was measured as the tensile strength according to JIS P8113, and the breaking length was determined.
  • Example 1 A polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 is dried and melted at 300 ° C., discharged through a spinneret having a pore number of 3000 at 492 g / min, taken up at a speed of 1230 m / min, An unstretched multifilament (subtow) having a fineness of 1.3 dtex and ⁇ n 0.0150 was obtained. Immediately after discharging the spinneret, a hydrophilic oil was applied with an oiling roller.
  • PET polyethylene terephthalate
  • the hydrophilic oil used was a poly (ethylene glycol) compound having an average molecular weight of about 12,000 consisting of 80 mol% terephthalic acid, 20 mol% isophthalic acid, 70 mass% polyethylene glycol having an average molecular weight of 3000 (based on copolymerization mass) and ethylene glycol.
  • the aqueous dispersion of the ether / polyester copolymer was adjusted to a concentration of 21% by mass as an emulsion (hereinafter also referred to as “polyether / polyester copolymer aqueous solution”).
  • the obtained unstretched multifilament (sub tow) was bundled up to 12 spindles without being wound up to obtain a fiber tow of 48,000 dtex. Subsequently, using a high-speed cutter, it was cut into 5 mm unstretched short fibers without crimping at a process speed described in the table.
  • the fiber tow tension before the cutter was 0.1 cN / dtex (28.6% of ⁇ y).
  • the moisture content of the undrawn short fibers after cutting was 15% by mass.
  • the high-speed cutter used here was such that the cutter blades faced upward, and the cutter blades were arranged radially.
  • a fiber tow composed of unstretched multifilaments is wound around a rotating rotor disposed further upward on the cutting side of the cutter blade, and is gradually pushed off by an inclined ring installed further upward. It was cut and shortened. Further, the distance between the blades from the cutting surface of the cutter blade to the back surface (cut fiber discharge side) was constant, and even during cutting, there was no increase in fiber discharge resistance, and no blade breakage occurred.
  • the obtained unstretched short fibers were mixed paper with uncrimped stretched short fibers.
  • the contact time with the drum is set to 2 minutes using a KRK high-temperature rotary dryer manufactured by Kumagai Riki Kogyo Co., Ltd. And adhesive heat treatment was performed.
  • the heat-treated sheet was measured for paper strength (breaking length) in accordance with JIS P8113 to obtain a mixed paper containing the undrawn short fibers of the present invention.
  • Example 1 Similarly to Example 1, a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was dried and melted at 300 ° C., and discharged through a spinneret having a pore number of 3000 at a rate of 492 g / min, and a speed of 1230 m / min. To obtain an unstretched multifilament (subtow) having a single fiber fineness of 1.3 dtex and ⁇ n 0.0160.
  • PET polyethylene terephthalate
  • a spinning oil agent prepared by adjusting an aqueous emulsion of 90% by mass of lauryl phosphate potassium salt and 10% by mass of terminal alkyl-blocked polyethylene glycol to 21% by mass was applied with an oiling roller.
  • the spinning oil used in Example 1 was used, the convergence property in the next canning process was too low, resulting in poor convergence in single yarn or subtow units, When it was done, it contained a lot of excess fiber.
  • Example 2 A total of 48,000 dtex of unstretched sub-tow was collected in a tow can. Further, 14 cans were combined to form a fiber tow of 67.2 million dtex, washed with water, and then the polyether / polyester copolymer aqueous solution used as the spinning oil agent in Example 1 was dipped in this step to obtain 100 mm A nip roller was tested and squeezed to give an emulsion at 22% by mass. Further, it was subjected to an EC cutter (drum type rotary cutter) and cut to a fiber length of 5 mm. The amount of emulsion adhered after cutting was 15% by mass. Table 1 shows the process conditions and physical properties of the obtained unstretched short fibers.
  • Example 2 Comparative Example 2
  • the spinning speed of 1230 m / min in Example 1 was changed to the speed shown in Table 1
  • the subsequent process speed was changed to the speed shown in Table 1 accordingly
  • the undrawn short Fiber and mixed paper were obtained.
  • Comparative Example 2 in which the spinning speed was 300 m / min adhered to the dryer in the drying process at the time of papermaking, and could not obtain mixed paper.
  • Table 1 shows the process conditions and physical properties of the obtained unstretched short fibers.
  • Example 3 was obtained by reducing the process speed of Example 1 and lowering the toe tension before the cutter. Table 1 shows the process conditions and physical properties of the obtained unstretched short fibers. Further, when the process speed was further reduced and the tow tension before the cutter was lowered, a large amount of 15 to 30 mm of excessively long fibers was generated, and when the unstretched short fibers were made on paper, it became an obvious defect. Further, when the process speed was increased to increase the toe tension before the cutter to a tension higher than the yield stress of the undrawn yarn, neck stretching occurred and the fiber had a large birefringence variation. Furthermore, when the unstretched short fibers were made on paper, only paper with low paper strength was obtained.
  • Example 4 As in Example 1, a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was used, except that the spinneret with the number of holes changed from 3000 to 1305 in Example 1 was used, and the fineness of the resulting short fibers was further increased. In order to adjust to Example 1, the conditions were changed, the liquid was discharged at 429 g / min, and the sample was taken at a speed of 2530 m / min. The fineness of the obtained single fiber was 1.3 dtex, and an unstretched multifilament (subtow) of ⁇ n 0.036 was obtained.
  • PET polyethylene terephthalate
  • the spinning oil used was an aqueous polyether / polyester copolymer dispersion having an average molecular weight of about 12000 used in Example 1, and 21% by mass was applied.
  • the obtained unstretched multifilament (sub tow) was bundled up to 12 spindles without being wound up to obtain a fiber tow of 20,000 dtex.
  • the high-speed cutter used in Example 1 was used to cut into 5 mm unstretched short fibers.
  • the moisture content of the undrawn short fibers after cutting was 15% by mass.
  • the obtained unstretched short fibers were made into a mixed paper with uncrimped short fibers in the same manner as in Example 1. Table 1 shows the process conditions and the physical properties of the obtained unstretched short fibers.
  • Example 5 instead of the polyethylene terephthalate in Example 1, polyethylene naphthalate (PEN) was used. That is, a polyethylene naphthalate chip having an intrinsic viscosity of 0.51 is dried and melted at 310 ° C., discharged through a spinneret having a pore number of 1305 at 310 g / min, taken up at a speed of 1000 m / min, and the fineness of a single fiber Obtained an unstretched multifilament (subtow) of 1.1 dtex and ⁇ n 0.06.
  • the spinning oil used was an aqueous polyether / polyester copolymer dispersion having an average molecular weight of about 12000 used in Example 1, and 21% by mass was applied.
  • the obtained unstretched multifilament (sub tow) was bundled up to 12 spindles without being wound up to obtain a fiber tow of 37,000 dtex. Subsequently, the high-speed cutter used in Example 1 was used to cut into 5 mm unstretched short fibers. The moisture content of the undrawn short fibers after cutting was 15% by mass.
  • the obtained unstretched short fibers were made into a mixed paper with uncrimped short fibers in the same manner as in Example 1. However, the drum surface temperature of the rotary dryer was 160 ° C. Table 1 shows the process conditions and the physical properties of the obtained unstretched short fibers.
  • a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was prepared.
  • PET polyethylene terephthalate
  • a polyether-polyester copolymer having an average molecular weight of about 12,000 comprising an acid component of 80 mol% terephthalic acid, 20 mol% isophthalic acid, 70% by mass of polyethylene glycol having an average molecular weight of 3000 (based on copolymerization mass) and an ethylene glycol component.
  • a combined aqueous dispersion (emulsion concentration 1 mass%) was prepared as an emulsion oil (spinning oil).
  • the PET chip is dried and melted at 300 ° C. and discharged through a spinneret having a hole number of 1305 at a rate of 510 g / min.
  • Emulsion oil is applied to the unstretched multifilament immediately after the discharge of the die by an oiling roller. After giving the drawn yarn a moisture content of 21%, it was taken up at a speed of 750 m / min with a Nelson roller pair 1 having a temperature of 55 ° C. to obtain an undrawn multifilament (subtow).
  • This subtow is bundled by 12 spindles to make about 82,000 dtex, and then preheated by winding 6 turns around a Nelson type roller pair 2 with a surface temperature of 55 ° C. and a peripheral speed of 788 m / min, then 100 ° C., peripheral speed of 2,
  • the Nelson type roller pair 3 at 457 m / min was made 6 turns.
  • the Nelson type roller pair 4 having a surface temperature of 220 ° C. and a peripheral speed of 2,457 m / min has 6 turns, the Nelson type roller pair 5 having a surface temperature of 220 ° C.
  • the fiber tow was made of stretched fiber by making a Nelson type roller pair having a surface temperature of 50 ° C. and a peripheral speed of 2,457 m / min for 6 turns (total draw ratio: 3.28 times).
  • the stretched fiber tow was continuously cut to a length of 5 mm with a pre-cutter tension of 0.1 cN / dtex.
  • water was sprayed from the upper and lower sides of the fiber tow with a spray, and the moisture content after cutting was set to 5% by mass.
  • the process speed at this time was 2,482 m / min.
  • the high-speed cutter used here was such that the cutter blades faced upward and the cutter blades were arranged radially.
  • a fiber tow composed of stretched multifilaments is wound around a rotating rotor arranged further above the cutting side of the cutter blade, and is further gradually pushed by an inclined ring installed above to cut the fiber tow. And shortened. Further, the distance between the blades from the cutting surface of the cutter blade to the back surface (cut fiber discharge side) was constant, and even during cutting, there was no increase in fiber discharge resistance, and no blade breakage occurred.
  • the obtained uncrimped short fibers were excellent in water dispersibility and particularly suitable for papermaking.
  • Table 2 shows the process conditions and the evaluation results of the obtained uncrimped short fibers.
  • a mixed paper made of the uncrimped drawn short fibers obtained in Example 6 and the undrawn short fibers obtained in Example 1 and Comparative Example 2 was prepared. That is, first, using a square sheet machine manufactured by Kumagai Riki Kogyo Co., Ltd., 60% by mass of the above-mentioned uncrimped stretched short fibers and the uncrimped unstretched short obtained in Example 1 or Comparative Example 2.
  • the paper strength of the mixed paper with the undrawn short fibers obtained in Example 1 was 0.45 km.
  • the mixed paper with the unstretched short fibers obtained in Comparative Example 2 was stuck to the dryer in the drying process at the time of paper making, and a mixed paper could not be obtained.
  • the mixed paper with Example 1 was able to obtain sufficient adhesion as a wet nonwoven fabric.
  • Example 7 The same dispersion as in Example 6 for polyethylene terephthalate (PET) chips having an intrinsic viscosity of 0.64 and an aqueous dispersion (emulsion concentration of 1% by mass) of a polyether / polyester copolymer having an average molecular weight of about 12000 was used as an emulsion oil (spinning oil). ) Prepared.
  • the above PET chip is dried and melted at 300 ° C., and discharged through a spinneret having a pore number of 2504 at 330 g / min.
  • a spinning oil is applied to an unstretched multifilament immediately after discharging the nozzle by an oiling roller. After giving the drawn yarn a moisture content of 21%, it was taken up at a speed of 635 m / min with a Nelson-type roller pair 1 having a temperature of 55 ° C. to obtain an undrawn multifilament (subtow).
  • This subtow is bundled by 12 spindles to make about 62,000 dtex, and then preheated by winding 6 turns around a Nelson type roller pair 2 having a surface temperature of 55 ° C. and a peripheral speed of 667 m / min, then 100 ° C., peripheral speed of 2, Nelson m roller pair 3 at 234 m / min was made to make 6 turns.
  • the Nelson-type roller pair 4 having a surface temperature of 220 ° C. and a peripheral speed of 2,234 m / min has 6 turns
  • the Nelson-type roller pair 5 having a surface temperature of 220 ° C.
  • a fiber tow made of drawn fibers was made into a Nelson type roller pair with a surface temperature of 50 ° C. and a peripheral speed of 2.234 m / min (total draw ratio: 3.52 times).
  • the stretched fiber tow was cut with the same high-speed cutter as in Example 1 so that the tension before the cutter was 0.1 cN / dtex and the length was continuously 5 mm.
  • water was sprayed from the upper and lower sides of the fiber tow with a spray, and the moisture content after cutting was set to 3% by mass.
  • the process speed at this time was 2,256 m / min. Even during cutting, the discharge resistance of the fiber did not increase and the blade was not broken.
  • the obtained uncrimped short fibers were excellent in water dispersibility and particularly suitable for papermaking.
  • the process conditions and the evaluation results of the obtained uncrimped short fibers are also shown in Table 2.
  • Non-crimped short fibers were obtained in the same manner as in Example 6 except that this emulsion oil was used. It was inferior in water dispersibility and was unsuitable for papermaking. The process conditions and the evaluation results of the obtained uncrimped short fibers are also shown in Table 2.
  • Comparative Example 4 In the same manner as in Comparative Example 1, a mixed aqueous emulsion (emulsion concentration 1% by mass) of 90% by mass of lauryl phosphate potassium salt and 10% by mass of terminal alkyl-blocked polyethylene glycol was prepared as an emulsion (spinning) oil.
  • an aqueous dispersion of a polyether / polyester copolymer having an average molecular weight of about 12000 used in Example 1 was prepared as a finishing oil, except that the emulsion concentration was changed from 1% by mass to 1.5% by mass. did.
  • Non-crimped short fibers were obtained in the same manner as in Example 6 except that the above spinning oil was used and the above finishing oil was added after stretching.
  • a finishing oil agent emulsion density
  • Example 8 A polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was dried at 170 ° C. for 4 hours, melted at 287 ° C., and discharged at 700 g / min through a spinneret having a pore diameter of 0.28 mm and a hole number of 1701; An unstretched multifilament (subtow) was obtained with a Nelson roller pair 1 at a speed of 634 m / min. After concentrating the 4 weights of the subtow to 44,164 dtex and continuously collecting the subtow around the Nelson type roller pair 2 at 50 ° C.
  • PET polyethylene terephthalate
  • the first-stage stretching was performed by causing the Nelson-type roller pair 3 at a temperature of 88 ° C. and a peripheral speed of 1,923 m / min to make 6 turns.
  • the Nelson type roller pair 4 having a surface temperature of 120 ° C. and a peripheral speed of 2,500 m / min was subjected to 6 turns to perform the second stage stretching, and then the surface temperature of 220 ° C. and the peripheral speed of 2,500 m / min of Nelson.
  • the mold roller pair 5 is subjected to heat treatment for 6 turns, and then the Nelson-type roller pair 6 is turned 6 times with a surface temperature of 80 ° C. and a peripheral speed of 2,500 m / min to obtain a drawn fiber tow having a total fineness of 11,200 dtex. (Total draw ratio: 3.94 times).
  • the obtained fiber tow is continuously formed in a curved portion a having an upward semicircular arc-shaped curvature radius (FIG. 3-f) of 61 mm shown in FIGS. 2 and 3, with a width of 100 mm (FIG. 2-d), Liquid applicator comprising an aperture region (FIG. 2-c) (stainless steel wire winding) having a plurality of apertures (FIG.
  • An emulsion oil agent which is an aqueous dispersion of 12,000 polyether-polyester copolymer (emulsion concentration 2 mass%), is discharged from a liquid application device at a liquid discharge rate of 5.0 kg / min (liquid discharge flow).
  • a fiber tow composed of stretched multifilaments is wound around a rotating rotor arranged further above the cutting side of the cutter blade, and is further gradually pushed by an inclined ring installed above to cut the fiber tow. And shortened. Further, the distance between the blades from the cutting surface of the cutter blade to the back surface (cut fiber discharge side) was constant, and even during cutting, there was no increase in fiber discharge resistance, and no blade breakage occurred. Despite the high cutting speed, the dispersibility in water was good. Table 3 shows the conditions and the evaluation results of the obtained short fibers.
  • Example 8 For the evaluation of wet nonwoven fabric, the mixed paper of uncrimped drawn short fibers obtained in Example 8 and undrawn short fibers obtained in Example 1 and Comparative Example 2 was used as the procedure described in Example 6. It was produced with.
  • the paper strength of the mixed paper with the undrawn short fibers obtained in Example 1 was 0.48 km.
  • the mixed paper with the unstretched short fibers obtained in Comparative Example 2 was stuck to the dryer in the drying process at the time of paper making, and a mixed paper could not be obtained.
  • the mixed paper with Example 1 was able to obtain sufficient adhesion as a wet nonwoven fabric.
  • Example 9 Short fibers were obtained in the same manner as in Example 8 except that the holding angle of the liquid applicator was 150 degrees (contact length 160 mm, contact time 0.004 seconds). Dispersibility in water was good. Table 3 shows the conditions and the evaluation results of the obtained short fibers.
  • Example 10 Short fibers were obtained in the same manner as in Example 9, except that the liquid discharge area of the liquid applicator was changed from 126 cm 2 (100 mm width ⁇ 126 mm length) to 290 cm 2 (100 mm width ⁇ 290 mm length). The liquid discharge flow rate at this time decreased to 0.6 m / min. Table 3 shows the conditions and the evaluation results of the obtained short fibers. Although both the short fiber moisture content and the oil agent adhesion rate were low, the dispersibility in water was good.
  • Example 5 A fiber was obtained in the same manner as in Example 8 except that the holding angle of the fiber tow was 10 °, the contact time was 0.0003 seconds, and the contact length was 11 mm.
  • the short fiber moisture content and oil agent adhesion rate (hereinafter, the short fiber moisture content and / or oil agent adhesion rate may be referred to as the liquid application rate) were low, and the dispersibility in water was insufficient.
  • Table 3 shows process conditions and evaluation results of the obtained short fibers.
  • Example 11 Short fibers were obtained in the same manner as in Example 8 except that the holding angle of the fiber tow was 40 °, the contact time was 0.001 second, and the contact length was 43 mm. Although the present invention has a low holding angle, dispersibility in water was good. Table 3 shows the conditions and the evaluation results of the obtained short fibers.
  • Example 6 A fiber was obtained in the same manner as in Example 8, except that the holding angle of the fiber tow was 180 °, the contact time was 0.005 seconds, and the contact length was 192 mm. Table 3 shows process conditions and evaluation results of the obtained short fibers. A number of entanglements (defects) between single fibers were confirmed due to single yarn breakage presumed to have occurred in the liquid applicator.
  • Example 12 The liquid discharge area of the liquid application device is changed from 126 cm 2 (100 mm width ⁇ 126 mm length) to 290 cm 2 (100 mm width ⁇ 290 mm length), and the liquid discharge amount from the liquid application device is 1.5 kg / min (liquid discharge flow rate) Except for 0.2 m / sec), it was the same as Example 8, and short fibers were obtained. Although in a region where the liquid discharge flow rate is low, the dispersibility in water was within an acceptable range. Table 3 shows the conditions and the evaluation results of the obtained short fibers.
  • Example 12 was the same as Example 12 except that the liquid discharge rate was 0.6 kg / min (liquid discharge flow rate 0.07 m / sec). The liquid application rate was low and the dispersibility in water was insufficient. Table 3 shows the conditions and the evaluation results of the obtained short fibers.
  • Example 13 A polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was dried at 170 ° C. for 4 hours, melted at 287 ° C., and discharged at 700 g / min through a spinneret having a pore diameter of 0.28 mm and a hole number of 1701; After the undrawn yarn is drawn at a speed of 1350 m / min by the Nelson type roller pair 1, this subtow is converged by 4 spindles without being collected, and the subtow is continuously collected at 50 ° C. and a peripheral speed of 1362 m / min.
  • PET polyethylene terephthalate
  • the mold roller pair 2 was wound for 6 turns and pre-heated, and then the Nelson-type roller pair 3 having a surface temperature of 88 ° C. and a peripheral speed of 3,037 m / min was made 6 turns to perform the first stage drawing.
  • the Nelson type roller pair 4 having a surface temperature of 120 ° C. and a peripheral speed of 3,500 m / min was subjected to 6 turns to perform the second stage stretching, and then the surface temperature of 220 ° C. and the peripheral speed of 3,500 m / min. 6 turns on the mold roller pair 5 and then heat treatment, then 6 turns on the Nelson type roller pair 6 with a surface temperature of 80 ° C. and a peripheral speed of 3,500 m / min, stretching at a total draw ratio of 2.57 times Then, heat treatment was performed to obtain a drawn fiber tow having a total fineness of 8,000 dtex.
  • the obtained fiber tow was continuously used, the liquid application device (liquid discharge area 290 cm 2 ) used in Example 10 was used, the holding angle of the oil agent application device was 150 degrees (contact length 160 mm), and the liquid discharge flow rate was 1.3 m.
  • the liquid application device liquid discharge area 290 cm 2
  • the holding angle of the oil agent application device was 150 degrees (contact length 160 mm)
  • the liquid discharge flow rate was 1.3 m.
  • Example 14 For Nelson type roller pairs 1 to 6, the roller surface temperature is normal temperature (20 to 40 ° C), the distance between each roller is 1.01 times, the total draw ratio is 1.05 times, and the speed before cutter is 660 m The conditions were the same as in Example 11 except that the time was changed to / min. Both the short fiber moisture content and the oil agent adhesion rate were high, but the dispersibility in water was good. Table 4 shows the process conditions and evaluation results of the obtained short fibers.
  • Example 8 The same fiber tow and emulsion oil agent as in Example 8 were used, and oiling was performed using an oiling roller composed of a rubber roller having a diameter of 145 mm.
  • the contact angle of the fiber tow with the oiling roller was 30 ° from the horizontal plane, and the holding angle was 100 °.
  • the rotation direction of the roller was the same as the traveling direction of the fiber tow (forward direction), and the roller rotation number was set to 39 rotations / minute. Since the cutting speed was high, the liquid application rate was low and the dispersibility in water was insufficient. Table 4 shows the process conditions and evaluation results of the obtained short fibers.
  • the curved portion a having a downward semicircular arc-shaped curvature radius (FIG. 4-f) of 61 mm has a width of 100 mm (FIG. 2-d) and a length of 126 mm (liquid ejection area 126 cm 2 ).
  • a liquid applicator (hereinafter referred to as a downward arc-shaped liquid applicator) comprising an aperture region (FIG. 2-c) (stainless steel wire winding) having a plurality of apertures (FIG. 2-b) having an aperture ratio of 0.5%
  • the short fiber was obtained in the same manner as in Example 8, except that the short fiber was changed. Similar to Example 8, the dispersibility in water was good. However, the liquid application rate was higher than that in Example 8. Table 4 shows the conditions and evaluation results of the obtained short fibers.
  • Example 16 Short fibers were obtained in the same manner as in Example 11 except that the liquid applicator was changed to a downward arc-shaped liquid applicator. Similar to Example 11, the dispersibility in water was good. However, the liquid application rate was higher than that in Example 11. Table 4 shows the conditions and evaluation results of the obtained short fibers.
  • Example 17 Short fibers were obtained in the same manner as in Example 14 except that the liquid applicator was changed to a downward arc-shaped liquid applicator. Similar to Example 14, the dispersibility in water was good. However, the liquid application rate was higher than that in Example 14. Table 4 shows the conditions and evaluation results of the obtained short fibers.
  • Example 18 The liquid applicator was changed to a downward arc-shaped liquid applicator, and the liquid discharge rate was changed from 5.0 kg / min to 11.0 kg / min (the liquid discharge flow rate increased from 0.6 m / sec to 1.3 m / sec). Except for this, it was the same as Example 10, and short fibers were obtained. Compared with Example 10, the dispersibility in water was good. The liquid application rate was higher than that in Example 10. Table 4 shows the conditions and evaluation results of the obtained short fibers.
  • Example 19 A polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was dried at 170 ° C. for 4 hours, melted at 287 ° C., and discharged at 700 g / min through a spinneret having a pore diameter of 0.28 mm and a hole number of 1701; An unstretched multifilament (subtow) was obtained with a Nelson roller pair 1 at a speed of 634 m / min. After concentrating the 4 weights of the subtow to 44,164 dtex and continuously collecting the subtow around the Nelson type roller pair 2 at 50 ° C.
  • PET polyethylene terephthalate
  • the first-stage stretching was performed by causing the Nelson-type roller pair 3 at a temperature of 88 ° C. and a peripheral speed of 1,923 m / min to make 6 turns.
  • the Nelson type roller pair 4 having a surface temperature of 120 ° C. and a peripheral speed of 2,500 m / min was subjected to 6 turns to perform the second stage stretching, and then the surface temperature of 220 ° C. and the peripheral speed of 2,500 m / min of Nelson.
  • the mold roller pair 5 is subjected to heat treatment for 6 turns, and then the Nelson-type roller pair 6 is turned 6 times with a surface temperature of 80 ° C. and a peripheral speed of 2,500 m / min to obtain a drawn fiber tow having a total fineness of 11,200 dtex. (Total draw ratio: 3.94 times).
  • the obtained fiber tow is continuously 200 mm long (FIG. 5-bb) (passing time 0.05 seconds) with respect to the running direction of the fiber tow in the opening region (FIG. 5-aa) shown in FIG. ), Width 100 mm (FIG. 5-cc) (liquid discharge area 200 cm 2 ), liquid application comprising a plurality of apertures (FIG. 5-aa) (triangular hole punching) having a porosity of 0.5%
  • the traveling fiber tow was arranged so as to be sandwiched between the upper and lower sides. The distance between the fiber tow and the aperture was 20 mm.
  • An emulsion oil agent that is an aqueous dispersion of an about 12,000 polyether-polyester copolymer (emulsion concentration 2 mass%) is discharged at a discharge rate of 16.0 kg / min (liquid discharge flow rate 1.3 m / sec), After applying an oil agent to the fiber tow, it was cut with a high-speed cutter (NMC-H290 manufactured by Oerlikon Neumag) with a cut length of 5 mm. At this time, the cutting speed of the fiber tow was 2,500 m / min, and the passing time of the liquid applicator was 0.005 seconds.
  • the high-speed cutter used here was such that each cutter blade was arranged radially so that the cutting side of the cutter blade was directed upward.
  • a fiber tow composed of stretched multifilaments is wound around a rotating rotor arranged further above the cutting side of the cutter blade, and is further gradually pushed by an inclined ring installed above to cut the fiber tow. And shortened. Further, the distance between the blades from the cutting surface of the cutter blade to the back surface (cut fiber discharge side) was constant, and even during cutting, there was no increase in fiber discharge resistance, and no blade breakage occurred. Despite the high cutting speed, the dispersibility in water was good. Table 5 shows the conditions and evaluation results of the obtained short fibers.
  • Example 19 For the evaluation of wet nonwoven fabric, the mixed paper of uncrimped drawn short fibers obtained in Example 19 and undrawn short fibers obtained in Example 1 and Comparative Example 2 was used as the procedure described in Example 6. It was made with.
  • the paper strength of the mixed paper with the undrawn short fibers obtained in Example 1 was 0.48 km.
  • the mixed paper with the unstretched short fibers obtained in Comparative Example 2 was stuck to the dryer in the drying process at the time of paper making, and a mixed paper could not be obtained.
  • the mixed paper with Example 1 was able to obtain sufficient adhesion as a wet nonwoven fabric.
  • Example 20 Short fibers were obtained in the same manner as in Example 19 except that the liquid discharge rate was 4.0 kg / min (liquid discharge flow rate 0.3 m / sec). Although in a region where the liquid discharge flow rate is low, the dispersibility in water was within an acceptable range. Table 5 shows the conditions and the evaluation results of the obtained uncrimped short fibers.
  • Example 21 Except that the opening area length in the running direction is 50 mm (liquid discharge area 50 cm 2 , passage time is 0.001 second) and the liquid discharge amount is 1.8 kg / min (liquid discharge flow rate 0.6 m / second), Short fibers were obtained in the same manner as in Example 19. Dispersibility in water was good. Table 5 shows the conditions and the evaluation results of the obtained uncrimped short fibers.
  • Example 22 A polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was dried at 170 ° C. for 4 hours, melted at 287 ° C., and discharged at 700 g / min through a spinneret having a pore diameter of 0.28 mm and a hole number of 1701; After the undrawn yarn is drawn at a speed of 1350 m / min by the Nelson type roller pair 1, this subtow is converged by 4 spindles without being collected, and the subtow is continuously collected at 50 ° C. and a peripheral speed of 1362 m / min.
  • PET polyethylene terephthalate
  • the mold roller pair 2 was wound for 6 turns and pre-heated, and then the Nelson-type roller pair 3 having a surface temperature of 88 ° C. and a peripheral speed of 3,037 m / min was made 6 turns to perform the first stage drawing.
  • the Nelson type roller pair 4 having a surface temperature of 120 ° C. and a peripheral speed of 3,500 m / min was subjected to 6 turns to perform the second stage stretching, and then the surface temperature of 220 ° C. and the peripheral speed of 3,500 m / min. 6 turns on the mold roller pair 5 and then heat treatment, then 6 turns on the Nelson type roller pair 6 with a surface temperature of 80 ° C. and a peripheral speed of 3,500 m / min, stretching at a total draw ratio of 2.57 times And the heat processing was implemented and the drawn fiber tow of the total fineness of 40,400 dtex was obtained.
  • the obtained fiber tow was continuously used in the liquid application apparatus used in Example 19 (length: 200 mm (passage time: 0.003 seconds), width: 100 mm (liquid discharge area: 200 cm 2 ), porosity: 0.5%).
  • Short fibers were obtained in the same manner as in Example 19 except that the fiber tow and the opening distance were 20 mm, and the traveling tow speed was 3,500 m / min. Despite the high cutting speed, the dispersibility in water was good. Table 5 shows the conditions and evaluation results of the obtained short fibers.
  • Example 23 For Nelson type roller pairs 1 to 6, with the roller surface temperature at room temperature (15 to 40 ° C), the distance between each roller is 1.01 times, the total draw ratio is 1.05 times, and the speed before cutter is 660 m The conditions were the same as in Example 19 except that the time was changed to / min. The number of seconds passing through the aperture was 0.018 seconds, and the dispersibility in water was good. Table 5 shows the process conditions and evaluation results of the obtained short fibers.
  • Example 24 In the liquid applicator shown in FIG. 5, except that the liquid is applied from only one surface of the gg portion except the ff portion in FIG. 6, and the liquid discharge rate is 8.0 kg / min (liquid discharge flow rate 0.7 m / sec) Was the same as in Example 19, and short fibers were obtained. Dispersibility in water was good. Table 5 shows the conditions and the evaluation results of the obtained uncrimped short fibers.
  • Oiling was performed using the same fiber tow and emulsion oil agent as in Example 19 and using an oiling roller composed of a rubber roller having a diameter of 145 mm.
  • the contact angle of the fiber tow with the oiling roller was 30 ° from the horizontal plane, and the holding angle was 100 °.
  • the rotation direction of the roller was the same as the traveling direction of the fiber tow (forward direction), and the roller rotation number was set to 39 rotations / minute. Since the cutting speed was high, the liquid application rate was low and the dispersibility in water was insufficient.
  • Table 5 shows the process conditions and the evaluation results of the obtained uncrimped short fibers.
  • Example 25 A polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 was dried at 170 ° C. for 4 hours, melted at 300 ° C., and discharged at 450 g / min through a spinneret having a hole number of 1305. After applying an emulsion oil agent to the unstretched multifilament with an oiling roller so that the moisture content of the unstretched yarn is 21%, the unstretched multifilament ( Subtow).
  • PET polyethylene terephthalate
  • This subtow was converged to 85,000 dtex by converging 12 spindles, continuously wound without being collected, and preheated by winding 6 turns around a Nelson type roller pair 2 having a surface temperature of 55 ° C. and a peripheral speed of 666 m / min.
  • the Nelson type roller pair 3 at 100 ° C. and a peripheral speed of 2,232 m / min was subjected to 6 turns.
  • the Nelson type roller pair 4 having a surface temperature of 220 ° C. and a peripheral speed of 2,188 m / min has 6 turns, the Nelson type roller pair 5 having a surface temperature of 220 ° C.
  • the fiber tow was made of stretched fibers by making a Nelson type roller pair having a surface temperature of 80 ° C. and a peripheral speed of 2,100 m / min for 6 turns (total draw ratio of 3.31 times).
  • the stretched fiber tow was continuously cut to a length of 5 mm with a pre-cutter tension of 0.1 cN / dtex.
  • an acid component composed of 80 mol% terephthalic acid and 20 mol% isophthalic acid, 70 mass% polyethylene glycol having an average molecular weight of 3,000, and ethylene glycol Sprayed with an emulsion oil agent, which is an aqueous dispersion (emulsion concentration 2 mass%) of a polyether-polyester copolymer having an average molecular weight of about 12,000, obtained with a composition of a diol component comprising 30 mass%, and moisture after cutting The rate was 15% by mass.
  • the cutter speed at this time was 2,121 m / min.
  • the high-speed cutter used here was such that the cutter blades faced upward and the cutter blades were arranged radially. Then, a fiber tow composed of stretched multifilaments is wound around a rotating rotor arranged further above the cutting side of the cutter blade, and is further gradually pushed by an inclined ring installed above to cut the fiber tow. And shortened. Further, the distance between the blades from the cutting surface to the back surface (cut fiber discharge side) of the cutter blade was constant, and even during cutting, the fiber discharge resistance did not increase and the blade was not broken.
  • the obtained uncrimped short fibers were not observed to have a bundling defect, were excellent in water dispersibility, and were particularly suitable for papermaking. Table 6 shows the process conditions and the evaluation results of the resulting uncrimped short fibers.
  • Example 25 the mixed paper of uncrimped drawn short fibers obtained in Example 25 and undrawn short fibers obtained in Example 1 and Comparative Example 2 was used as the procedure described in Example 6. It was produced with.
  • the paper strength of the mixed paper with the unstretched short fibers obtained in Example 1 was 0.44 km.
  • the mixed paper with the unstretched short fibers obtained in Comparative Example 2 was stuck to the dryer in the drying process at the time of paper making, and a mixed paper could not be obtained.
  • the mixed paper with Example 1 was able to obtain sufficient adhesion as a wet nonwoven fabric.
  • This sub-tow is converged by 12 spindles to 85,000 dtex, continuously wound without being collected, and preheated by winding 6 turns around a Nelson type roller pair 2 having a surface temperature of 55 ° C. and a peripheral speed of 666 m / min.
  • the Nelson type roller pair 3 was rotated 6 times at a temperature of 2 ° C. and a peripheral speed of 2,232 m / min.
  • the Nelson type roller pair 4 having a surface temperature of 220 ° C. and a peripheral speed of 2,232 m / min has 6 turns, the Nelson type roller pair 5 having a surface temperature of 220 ° C.
  • a fiber tow made of stretched fibers was made 6 turns by a Nelson roller pair 6 having a surface temperature of 220 ° C. and a peripheral speed of 2,232 m / min (total draw ratio: 3.51 times).
  • the stretched fiber tow was continuously cut to a length of 5 mm with a pre-cutter tension of 0.1 cN / dtex.
  • an acid component of 80 mol% terephthalic acid and 20 mol% isophthalic acid and 70% by mass of polyethylene glycol having an average molecular weight of 3,000 (copolymerization Sprayed with an emulsion oil agent, which is an aqueous dispersion (emulsion concentration 2 mass%) of a polyether-polyester copolymer having an average molecular weight of about 12,000, obtained from a diol component composed of 30 mass% ethylene glycol).
  • the moisture content after cutting was set to 15% by mass.
  • the cutter speed at this time was 2,254 m / min.
  • the high-speed cutter used here was such that the cutter blades faced upward and the cutter blades were arranged radially.
  • a fiber tow composed of stretched multifilaments is wound around a rotating rotor arranged further above the cutting side of the cutter blade, and is further gradually pushed by an inclined ring installed above to cut the fiber tow. And shortened. Further, the distance between the blades from the cutting surface to the back surface (cut fiber discharge side) of the cutter blade was constant, and even during cutting, the fiber discharge resistance did not increase and the blade was not broken.
  • the obtained uncrimped short fibers were found to have many bundled defects and had a high heat shrinkage rate, and could not be said to be suitable for papermaking. Table 6 shows the process conditions and the evaluation results of the resulting uncrimped short fibers.

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PCT/JP2018/002771 2017-01-30 2018-01-29 無捲縮短繊維の製造方法、及び得られた無捲縮短繊維を含む湿式不織布 WO2018139651A1 (ja)

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