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WO2022080401A1 - Filé et son procédé de fabrication - Google Patents

Filé et son procédé de fabrication Download PDF

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Publication number
WO2022080401A1
WO2022080401A1 PCT/JP2021/037848 JP2021037848W WO2022080401A1 WO 2022080401 A1 WO2022080401 A1 WO 2022080401A1 JP 2021037848 W JP2021037848 W JP 2021037848W WO 2022080401 A1 WO2022080401 A1 WO 2022080401A1
Authority
WO
WIPO (PCT)
Prior art keywords
sliver
spun yarn
mass
polyimide
fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/037848
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English (en)
Japanese (ja)
Inventor
直也 福島
和広 名本
広大 岸本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unitika Textiles Co Ltd
Unitika Trading Co Ltd
Original Assignee
Unitika Textiles Co Ltd
Unitika Trading Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unitika Textiles Co Ltd, Unitika Trading Co Ltd filed Critical Unitika Textiles Co Ltd
Priority to JP2022557032A priority Critical patent/JP7286122B2/ja
Priority to CN202180068676.2A priority patent/CN116438338A/zh
Publication of WO2022080401A1 publication Critical patent/WO2022080401A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/04—Blended or other yarns or threads containing components made from different materials
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/36—Cored or coated yarns or threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/47—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads

Definitions

  • the present invention relates to a spun yarn containing polyimide staple fibers and a method for producing the same.
  • tops and underwear (tops) used in places exposed to flames, high heat, etc. such as firefighting clothes, work clothes at steel mills or steel mills, work clothes for welding work, etc.
  • cloth made of heat-resistant fibers such as aramid fibers is used for gloves, socks, etc.).
  • polyimide fiber is known as a fiber having excellent chemical resistance and heat resistance.
  • Patent Document 3 describes a manufacturing method for obtaining a polyimide multifilament, and describes that it can be used for various industrial materials such as electrically insulating materials, flameproof clothing, tire cords, and FRP.
  • Patent Document 4 as a laminate suitably used as a filter cloth having excellent heat resistance, chemical resistance, dimensional stability and strength under severe conditions such as high temperature stress and acidic conditions. , A laminate made by laminating a woven fabric made of polyimide multifilament yarn and a web made of polyimide staples is described.
  • polyimide fibers with excellent heat resistance, chemical resistance, etc. are used, further improvement in performance can be expected.
  • the polyimide fiber has a problem that it is inferior in flexibility because it has high rigidity.
  • spun yarns capable of providing woven and knitted fabrics having a soft texture while being able to fully utilize the heat resistance and chemical resistance inherent in polyimide fibers. has not yet been developed.
  • a main object of the present invention is to provide a polyimide staple fiber-containing spun yarn capable of producing a woven or knitted fabric having a soft texture while being excellent in heat resistance, chemical resistance and abrasion resistance by using a predetermined amount of polyimide staple fiber. There is something in it.
  • the present inventors have considered knitting and knitting using spun yarn using polyimide short fibers (staple fibers) in order to obtain the above-mentioned woven and knitted fabric.
  • the above object could be achieved by using a spun yarn containing a polyimide-based staple fiber bundle having a polyimide staple fiber content of 50% by mass or more.
  • spun yarn in addition to the yarn obtained by spinning fibers such as cotton, wool, cotton, wool and hemp, short fibers such as polyester, polyamide and acrylic are used together with the yarn as chemical fibers. Spun yarn is widely used.
  • polyimide staple fibers have high rigidity and greatly differ in the amount of water and oil, so polyimide staple fibers are used instead of the short fibers used in the normal spinning process. However, it is presumed that this is because the desired spun yarn cannot be obtained.
  • the present inventors reviewed the general spinning process, especially in the following points.
  • the raw cotton is unraveled using a blending cotton machine, and at the same time, the dust adhering to the raw cotton is removed to obtain a sheet-shaped "wrap".
  • the sheet-shaped wrap is supplied to the card process.
  • the wrap is carded using a carding machine to separate the fibers one by one and align them in parallel to remove small debris and short fibers. The remaining long fibers are aligned to some extent in a parallel state to spin a web, which is focused and pressed with a calendar roll to obtain a string-shaped "card sliver".
  • Polyimide fibers have high rigidity, and as described above, both water and oil are different from chemical fibers such as polyester and polyamide. Therefore, staple fibers (raw cotton) in which polyimide short fibers account for 50% by mass or more are mixed.
  • the resulting sheet-shaped wrap has poor uniformity.
  • the wrap is carded to separate the fibers one by one, and a web that is aligned in a parallel state is spun, and then the web is focused and introduced into a calendar roll. Is not focused and the phenomenon of rolling up occurs. As a result, the web is not introduced into the calendar roll and the card sliver cannot be obtained.
  • the winding phenomenon is small, and even when the web is introduced into the calendar roll, it is not possible to obtain a highly well-proportioned card sliver in which the fibers are aligned in parallel.
  • the present inventors have made a car with a wrap obtained by using a staple fiber raw material containing a predetermined amount of oil and then cotton-carding it, in particular, in the carding process.
  • a staple fiber raw material containing a predetermined amount of oil
  • cotton-carding it, in particular, in the carding process.
  • the present invention relates to the following spun yarn and a method for producing the same.
  • a spun yarn containing polyimide staple fibers (1) Contains a polyimide-based staple fiber bundle having a polyimide staple fiber content of 50% by mass or more. (2) The content of polyimide staple fibers in the spun yarn is 20% by mass or more.
  • the spun yarn containing polyimide staple fibers has a core portion and a sheath portion in a cross section perpendicular to the longitudinal direction of the yarn, and the core portion is the polyimide-based staple fiber bundle.
  • a method for producing a spun yarn which comprises a step of obtaining. 9.
  • a plurality of kneaded slivers obtained from the card sliver are used, at least one kneaded sliver is used as a core sliver, and the other kneaded sliver is used as a sheath sliver.
  • Item 8 The manufacturing method according to Item 8, further comprising a step of obtaining a blister yarn having a two-layer structure by spinning while winding the sliver for parts.
  • the spun yarn of the present invention contains a polyimide-based staple fiber bundle having a polyimide staple fiber content of 50% by mass or more, it has excellent heat resistance, chemical resistance, and abrasion resistance, which are the original characteristics of the polyimide fiber. It has properties and can give a soft texture to the obtained woven and knitted fabric.
  • the spun yarn of the present invention has excellent heat resistance, chemical resistance, and chemical resistance, particularly when it has a two-layer structure containing polyimide short fibers in the core portion and cellulosic fibers in the sheath portion. It has abrasion resistance and the like, and can impart a soft texture and high dyeability to the obtained woven and knitted fabric.
  • the woven and knitted fabric obtained from the spun yarn of the present invention is used in applications where there is a high risk of being exposed to flames or high heat, such as firefighting clothes, work clothes at steel mills or steel mills, work clothes for welding work, and the like. Suitable for used work clothes, work gloves, etc.
  • the spun yarn of the present invention is a spun yarn containing polyimide staple fibers.
  • a polyimide-based staple fiber bundle having a polyimide staple fiber content of 50% by mass or more (hereinafter, may be simply referred to as "short fiber bundle P") is included.
  • the content of polyimide staple fibers in the spun yarn is 20% by mass or more. It is characterized by that.
  • the spun yarn of the present invention is not particularly limited in its form, structure, etc. as long as it contains a short fiber bundle P, and is, for example, a single type (single layer) consisting of only a short fiber bundle P.
  • the spun yarn of the mold), the two-layer structure spun yarn having a core-sheath structure in which the short fiber bundle P forms the core portion or the sheath portion, or the like may be used.
  • a two-layer structure spun yarn is preferable in order to impart properties such as soft texture, dyeability, and water absorption suitable for clothing applications to a woven or knitted fabric.
  • the single type spun yarn is a spun yarn substantially composed of only short fiber bundles P having a polyimide short fiber content of 50% by mass or more. As shown in FIG. 5A, the spun yarn is a single layer (single phase) in a cross section perpendicular to the longitudinal direction of the yarn.
  • the spun yarn substantially composed of the polyimide short fibers is the spun yarn of the present invention.
  • the short fiber bundle P contains fibers other than the polyimide short fibers (hereinafter, may be referred to as "second short fibers")
  • the polyimide short fibers and the second short fibers are used.
  • the blended yarn containing fibers is the spun yarn of the present invention.
  • the two-layer structure spun yarn has a core portion or a sheath portion of a short fiber bundle P, and has a core portion and a sheath portion in a cross section perpendicular to the longitudinal direction of the yarn.
  • the spun yarn 10 as shown in FIG. 4 can be mentioned.
  • the spun yarn 10 is composed of a core portion 11 which is a staple fiber bundle P and a sheath portion 12 formed so as to cover the periphery thereof.
  • FIG. 5C shows a schematic cross section of the spun yarn 10 perpendicular to the longitudinal direction of the yarn.
  • the present invention may have a structure in which the core portion and the sheath portion have the opposite arrangements to those in FIG. 5C.
  • the present invention also includes a spun yarn in which the staple fiber bundle P is a sheath portion 12, for example, as shown in the cross-sectional view of FIG. 5B.
  • the sheath portion 12 is a staple fiber bundle P (hereinafter, may be referred to as “spun yarn A”).
  • spun yarn B Two types of spun yarns in which the core portion 11 is a staple fiber bundle P (hereinafter, may be referred to as “spun yarn B”) are preferable.
  • the two-layer structure spun yarn of the present invention uses a plurality of kneaded slivers having a high degree of proportion obtained in the above-mentioned kneading process, and in the rough spinning process, at least one kneaded sliver is used as a core sliver, and the like. It is preferable that the kneaded sliver is obtained by a method including a step of winding a sliver for a core portion as a sliver for a sheath portion and spinning while forming a sheath portion to obtain a blister yarn having a two-layer structure. The detailed manufacturing method of the two-layer structure spun yarn will be described later.
  • the content of polyimide staple fibers in the spun yarn is 20% by mass or more, and particularly preferably 25% by mass or more. Therefore, for example, it can be set to 30% by mass or more, or can be set to 50% by mass or more. Thereby, the original physical properties (heat resistance, chemical resistance, abrasion resistance, etc.) of the polyimide staple fiber can be more effectively exhibited.
  • the upper limit of the above content can be, for example, about 90% by mass, but is not limited to this.
  • the polyimide short fibers may be contained in both the core portion and the sheath portion. Alternatively, it may be contained only in the short fiber bundle P.
  • the spun yarn of the present invention is essential to contain the staple fiber bundle P.
  • One or two or more short fiber bundles P may be contained in the spun yarn of the present invention.
  • one staple fiber bundle P is generally composed of one kneaded sliver immediately before being introduced into a roving machine.
  • the number of short fiber bundles P is one.
  • the polyimide short fibers in the short fiber bundle P are not limited as long as they are treated as short fibers, but usually, the fiber length is preferably 20 to 80 mm.
  • the single fiber fineness is preferably in the range of 0.5 to 10.0 dtex, more preferably in the range of 0.8 to 3.0 dtex. If it is less than 0.5 dtex, the strength of the fiber itself may be inferior. On the other hand, if the thickness exceeds 10.0 dtex and becomes excessively thick, the strength of the spun yarn tends to decrease due to less entanglement between the fibers, and the workability and texture of the post-process may be inferior. ..
  • the polyimide staple fiber contained in the short fiber bundle P preferably has a limiting oxygen index (LOI value) of 36 to 38, which is an index of heat resistance (flame retardancy).
  • LOI value limiting oxygen index
  • the content of the polyimide short fibers contained in the short fiber bundle P is usually 50% by mass or more, particularly preferably 60% by mass or more, and more preferably 70% by mass or more.
  • the upper limit of the content can be, for example, 100% by mass, but is not limited thereto. If the above content is less than 50% by mass, the original physical properties of the polyimide fiber may not be obtained.
  • the short fibers other than the polyimide short fibers are contained in the short fiber bundle P. Will be included.
  • the second staple fiber may be one kind or two or more kinds.
  • the second staple fiber is not particularly limited as long as it does not interfere with the effect of the present invention, and may be any synthetic fiber, semi-synthetic fiber or natural fiber.
  • at least one of polyamide fiber, polyester fiber, acrylic fiber, cellulosic fiber, polyvinyl alcohol fiber and the like can be preferably used.
  • cellulosic fibers cellulose-based staple fibers
  • the second staple fiber is preferably one having flame retardancy.
  • the cellulosic fiber is not particularly limited, and for example, natural cellulose fiber such as cotton and linen, regenerated cellulose fiber such as bisco rayon and solvent-spun cellulose fiber, and modal fiber can be used.
  • a cellulose fiber having flame retardancy flame retardant cellulose fiber such as flame retardant rayon fiber
  • the cellulose fiber having flame retardancy include regenerated cellulose fiber containing a flame retardant containing a phosphorus compound as a main component inside the fiber. This regenerated cellulose fiber can be easily obtained by applying the existing viscose method or the like mutatis mutandis. For example, if known wet spinning is performed by adding a flame retardant to the spinning liquid, regenerated cellulose fibers having flame retardancy can be easily obtained.
  • the cellulosic fiber is not limited as long as it is treated as a short fiber, but it is usually preferable that the fiber length is 20 to 80 mm.
  • the single fiber fineness is preferably in the range of 0.5 to 6.0 dtex, and more preferably in the range of 1.0 to 5.0 dtex. If it is less than 0.5 dtex, the strength of the fiber itself may be inferior. On the other hand, if the thickness exceeds 6.0 dtex and becomes excessively thick, the strength of the spun yarn tends to decrease due to less entanglement between the fibers, and the workability and texture of the post-process may decrease.
  • Examples of the embodiment in which the second staple fiber is contained in the short fiber bundle P include a composition in which the polyimide short fiber is 60 to 100% by mass and the second staple fiber is 0 to 40% by mass. Further, the ratio of the cellulosic fiber to the second staple fiber can be, for example, about 90 to 100% by mass, but is not limited to this.
  • the spun yarn of the present invention contains the short fiber bundle P, but in the case of the two-layer structure spun yarn as described above, the short fibers other than the short fiber bundle P are used.
  • One or more of bundles hereinafter, also referred to as "staple bundle Q" will be included.
  • the type of the fiber constituting the short fiber bundle Q the same type as the polyimide short fiber and the second short fiber used in the short fiber bundle P can be used, and one or more of these can be used. It can be adopted as appropriate.
  • the staple fiber bundle Q a yarn containing 50% by mass or more (preferably 60% by mass or more) of cellulosic fibers can be preferably adopted. Thereby, the desired characteristics can be more reliably imparted to the spun yarn.
  • Examples of the embodiment of the short fiber bundle Q include a composition in which the second staple fiber is 60 to 100% by mass and the polyimide staple fiber is 0 to 40% by mass.
  • the ratio of the cellulosic fiber to the second staple fiber can be, for example, about 85 to 100% by mass, but is not limited thereto.
  • the spun yarn of the present invention contains a staple fiber bundle P. Then, by adopting the manufacturing method described later while having the short fiber bundle P, it is possible to obtain a spun yarn having no thickness spots (small Worcester spots (U%)). With such a spun yarn, the obtained woven or knitted fabric has a soft texture and improved quality, and a woven or knitted fabric that can be used for a wide range of clothing applications can be obtained. From this point of view, in the spun yarn of the present invention, the Worcester spot (U%) is preferably 13% or less, and more preferably 12% or less. The lower limit of Worcester spots (U%) can be, for example, about 8%, but is not limited to this.
  • the spun yarn of the present invention preferably has a limiting oxygen index (LOI value) of 25 or more, which is an index of heat resistance (flame retardancy), and more preferably 26 to 41.
  • LOI value limiting oxygen index
  • the wear strength (indicated by the average value of the number of reciprocating frictions measured according to the standard time of 9.10.1 A method of Japanese Industrial Standard JIS L1095) is preferably 350 or more.
  • JIS L1095 9.10 wear strength 9.10.1 A method and A method are based on the following procedure. a) Standard time: A metal cylinder with a diameter of 7.6 cm is wrapped with Cw-C-P1000 abrasive paper specified in JIS R6253, and a sample prepared according to Clause 7 is 0.00265 N / tex as shown in FIG. Make contact with a load applied.
  • the metal cylinder is reciprocated at a reciprocating speed of 130 times / minute for a distance of 10 cm, and the number of reciprocating frictions until the sample is cut due to wear is measured.
  • the number of tests is 30, and the wear strength is expressed by rounding the average value of the number of frictions and the volatility to one digit after the decimal point. If the load is different, if the load and the number of tests are increased, the number of tests shall be added to the test report.
  • the spun yarn of the present invention can be applied to a woven or knitted fabric having characteristics such as soft texture, dyeability, and water absorption, which is particularly suitable for clothing applications. It is preferable to do so. Therefore, as a preferred embodiment, the two-layer structure spun yarn (particularly the above-mentioned spun yarns A and B) will be described more specifically.
  • the spun yarn A is composed of a staple fiber bundle P arranged as a sheath portion 12 and a short fiber bundle Q arranged as a core portion 11 in the space of the sheath portion 12. ..
  • the sheath portion is a polyimide-based staple fiber bundle (short fiber bundle P) in which the content of polyimide staple fibers is 50% by mass or more.
  • the short fiber bundle P in the sheath portion preferably contains 60% by mass or more of polyimide short fibers, and more preferably 70% by mass or more of polyimide short fibers.
  • the second staple fiber other than the polyimide staple fiber contained in the sheath portion those having excellent heat resistance, chemical resistance, abrasion resistance and the like are preferable.
  • flame-retardant rayon fiber, flame-retardant modal fiber, flame-retardant vinylon fiber, flame-retardant polyester fiber, flame-retardant acrylic fiber, aramid fiber and the like can be mentioned.
  • a plurality of types of these fibers may be contained.
  • these can also be used as the second staple fiber of the core portion.
  • the core portion is a staple fiber bundle Q containing 60% by mass or more of the second staple fiber.
  • the second staple fiber preferably contains a cellulosic fiber.
  • the cellulosic fiber preferably contains 60% by mass or more in the core portion.
  • the second staple fiber other than the cellulose-based fiber contained in the core portion those that do not interfere with the mechanical property values of the two-layer structure spun yarn and the effect of imparting a soft texture by the cellulose-based fiber are preferable, for example, acrylic fiber and polyester. Fiber or the like can be used.
  • the content of the polyimide staple fibers in the entire spun yarn A is preferably 20% by mass or more, and more preferably 25% by mass or more.
  • the content of the second staple fiber in the entire spun yarn A is preferably 20 to 80% by mass, more preferably 25 to 75% by mass.
  • the second short fiber in the core preferably contains a cellulosic fiber, and the proportion of the cellulosic fiber in the core is 60% by mass or more, particularly 80% by mass or more, and further 90% by mass or more. It is preferable to have.
  • a cellulosic fiber is used as the second staple fiber, it is possible to impart a soft texture or water absorption to the obtained woven or knitted fabric, and the fiber can be suitably used for clothing.
  • a two-layer structure spun yarn for example, a kneaded sliver containing 50% by mass or more of polyimide short fibers is used as a sliver for a sheath portion, and 50% by mass or more (particularly 60% by mass) of a cellulosic fiber is used as a sliver for a core portion. % Or more) is preferably used as a two-layer structure spun yarn.
  • the spun yarn A has a structure as described above, a large amount of polyimide short fibers are exposed on the fiber surface, so that the spun yarn A is excellent in heat resistance, chemical resistance, abrasion resistance, and the like.
  • the second staple fiber is contained in a relatively large amount in the core portion, the fiber can also have the performance of the second staple fiber. For example, in the case of a cellulosic fiber, it has an excellent soft texture, water absorption and the like.
  • the spun yarn A preferably has a limiting oxygen index (LOI value) of 36 or more, which is an index of heat resistance (flame retardancy), and more preferably 37 or more.
  • LOI value limiting oxygen index
  • the wear strength is preferably 3000 or more, and more preferably 3500 or more. ..
  • the area ratio of the core portion to the sheath portion in the two-layer structure spun yarn of the present invention is obtained by taking a photograph of a cross section cut perpendicular to the longitudinal direction of the two-layer structure spun yarn with an optical microscope. The area ratio can be measured more.
  • the core portion has a composition of 0 to 40% by mass of polyimide staple fibers
  • the second short fiber has a composition of 60 to 100% by mass
  • the sheath portion has a polyimide staple fiber 90.
  • examples thereof include a composition in which the content is up to 100% by mass and the second staple fiber is 0 to 10% by mass.
  • cellulosic fiber is 90 to 100% by mass
  • at least one of acrylic fiber, polyester fiber, polyvinyl alcohol fiber and the like is 0 to 10% by mass. can.
  • the spun yarn B is composed of a short fiber bundle Q arranged as a sheath portion 12 and a short fiber bundle P arranged as a core portion 11 in the space of the sheath portion 12. ..
  • the spun yarn B is a polyimide-based staple fiber bundle (short fiber bundle P) in which the core portion contains 50% by mass or more of polyimide staple fibers.
  • the short fiber bundle P in the core portion preferably contains 60% by mass or more of polyimide short fibers, and more preferably 70% by mass or more of polyimide short fibers.
  • the second short fiber contained in the core portion those having excellent heat resistance, chemical resistance, abrasion resistance and the like are preferable, and for example, flame-retardant rayon fiber, flame-retardant modal fiber, flame-retardant vinylon fiber, flame-retardant polyester fiber, etc. At least one of flame-retardant acrylic fibers and the like can be mentioned. These can also be used as second staples in the sheath.
  • the second staple fiber contained in the core portion contains the same type of fiber as the second staple fiber contained in the sheath portion.
  • the sheath portion is a short fiber bundle Q containing 60% by mass or more (preferably 80% by mass or more, more preferably 90 to 100% by mass or more) of the second short fibers.
  • the second short fiber contained in the sheath portion it is preferable to use a cellulosic fiber, preferably one containing 50% by mass or more of the cellulosic fiber in the sheath portion, more preferably 60% by mass or more, and further. Most preferably, it contains 90% by mass or more. Therefore, the content can be set to 90 to 100% by mass.
  • a cellulosic fiber as the second staple fiber, it is possible to impart a soft texture or water absorption to the obtained woven or knitted fabric, and it can be suitably used for clothing applications.
  • the second staple fiber in the sheath portion preferably contains a cellulosic fiber, but the second staple fiber other than the cellulose fiber depends on the mechanical properties of the two-layer structure spun yarn or the cellulosic fiber. It is preferable to use it within a range that does not interfere with the soft texture or the effect of imparting dyeability.
  • at least one of acrylic fiber, polyester fiber, vinylon fiber and the like can be preferably used.
  • the content of the polyimide staple fibers in the entire spun yarn B is usually preferably 20% by mass or more, and more preferably 25% by mass or more.
  • the content of the second staple fiber in the entire spun yarn B is usually preferably 20 to 80% by mass, and more preferably 25 to 75% by mass.
  • the second staple fiber When the content of the second staple fiber constituting the spun yarn B is less than 20% by mass, or when the proportion of the second staple fiber in the sheath portion is less than 60% by mass, the second staple fiber is placed on the fiber surface. It may not be possible to sufficiently impart the characteristics (for example, soft texture, dyeability, water absorption, etc.) that can be obtained by using the fiber, and it may be difficult to widely use it especially for general clothing applications.
  • a kneaded sliver containing 50% by mass or more (particularly 60% by mass or more) of cellulosic fibers is used as a sliver for a sheath portion, and 50 mass of polyimide short fibers are used as a sliver for a core portion. It is preferable to use a staple sliver containing% or more to form a two-layer structure spun yarn.
  • the spun yarn B covers the property of the polyimide fibers inferior in rigidity or dyeability, and is heat resistant as the spun yarn. It is possible to impart excellent performance such as resistance, chemical resistance, and abrasion resistance. In particular, by containing 50% by mass or more of cellulosic fibers in the sheath portion, it is possible to obtain a spun yarn having excellent dyeability or soft texture.
  • the spun yarn B preferably has a limiting oxygen index (LOI value) of 26 or more, which is an index of heat resistance (flame retardancy), as the above-mentioned characteristic value.
  • LOI value limiting oxygen index
  • the wear strength is preferably 350 or more, and more preferably 450 or more. ..
  • the core portion has a composition of 60 to 80% by mass of polyimide staple fibers
  • the second short fiber has a composition of 20 to 40% by mass
  • the sheath portion is a polyimide staple fiber.
  • examples thereof include those having a composition of 0 to 10% by mass and 90 to 100% by mass of the second staple fiber.
  • cellulosic fiber is 90 to 100% by mass
  • at least one of acrylic fiber, polyester fiber, polyvinyl alcohol fiber and the like is 0 to 10% by mass. can.
  • the yarn of the present invention at least one kneaded sliver is used as a core sliver, and another kneaded sliver is wound around the core sliver as a sheath sliver.
  • the yarn is obtained through a step of forming a blister yarn having a two-layer structure having a core portion and a sheath portion by a method including a step of taking out.
  • a two-layer structure spun yarn having a plurality of core portions can also be used. That is, the two-layer structure spun yarn of the present invention may have two or more core portions.
  • the spun yarn of the present invention is, for example, the following steps (1) and (2): (1) Using a short fiber raw material containing 100 parts by mass of polyimide staple fibers and 0.05 to 0.3 parts by mass of an oil agent, a sheet-shaped wrap containing 50% by mass or more of polyimide staple fibers is obtained by a cotton carder treatment. In the process (blended cotton carding process) and (2) when the sheet-shaped wrap is carded, the amount of static electricity generated in the web obtained after the carding process is within the range of -0.2 to +0.2 kv.
  • the process of obtaining a card sliver while adjusting (card process) It can be suitably produced by a method for producing a spun yarn, which comprises.
  • a short fiber raw material containing 100 parts by mass of polyimide staple fibers and 0.05 to 0.3 parts by mass of an oil agent is used, and by the mixed cotton treatment, a sheet containing 50% by mass or more of polyimide staple fibers is used. Get a lap.
  • a staple fiber raw material containing 100 parts by mass of polyimide short fibers and 0.05 to 0.3 parts by mass of an oil agent is used. That is, a sheet-shaped wrap is obtained by using a surface-treated polyimide staple fiber in which the type and adhesion amount of the oil agent are controlled and the oil agent is applied to the fiber surface as the short fiber raw material (starting material). Then, in the card process, the card process is performed while adjusting the amount of static electricity generated in the web spun from the card machine to ⁇ 0.2 kv or less by adjusting the atmospheric temperature, humidity, etc. near the card process, and the card sliver is performed. obtain.
  • the oil agent a commercially available fiber oil agent for spinning can be used, and the fiber oil agent used at the time of spinning synthetic fibers is particularly preferable.
  • a surfactant it is preferable to use a surfactant, and it is more preferable to use a nonionic surfactant.
  • the nonionic surfactant may be any of an ester type, an ether type, an ester ether type and the like.
  • an ether type particularly a polyoxyethylene / alkyl ether type
  • a commercially available product can also be used. For example, "Marpoteron LE” manufactured by Matsumoto Oil & Fat Pharmaceutical Co., Ltd. can be preferably used.
  • the oil agent is preferably added in an amount of 0.05 to 0.3% by mass, and more preferably 0.08 to 0.2% by mass, based on the fiber mass of the polyimide staple fiber. By setting it within this range, it is possible to more reliably control the amount of static electricity generated on the web in the card process.
  • the method of applying the oil agent to the polyimide staple fibers is not particularly limited.
  • a diluted solution prepared by diluting the oil agent to a concentration of about 1.0 to 5.0% is prepared, and the surface of the raw cotton of the polyimide short fibers is sprayed.
  • a method of refueling by spraying evenly can be preferably adopted.
  • the timing at which the oil agent is applied to the polyimide staple fibers is not limited, but it is desirable to carry out at least before the mixed cotton treatment.
  • the conditions for the mixed cotton treatment are not particularly limited as long as a sheet-shaped wrap can be obtained by unraveling the polyimide short fibers which are raw cotton. It can also be carried out according to the range of.
  • a card sliver is obtained while adjusting the amount of static electricity generated in the web obtained after the carding process within the range of ⁇ 0.2 to +0.2 kv. That is, the carding process is performed so that the amount of electricity generated in the web obtained in the card process is within the range of ⁇ 0.2 to +0.2 kv.
  • one of the particularly important steps is a card step of obtaining a sliver from a wrap obtained by a blending cotton machine.
  • the card process will be described with reference to FIG.
  • the polyimide short fibers which are raw cotton
  • the polyimide short fibers are loosened using a blending cotton machine, and at the same time, dust adhering to the raw cotton is removed to obtain a sheet-shaped wrap 54.
  • This lap is introduced into the card machine via multiple rollers. Even when the polyimide short fibers and the second short fibers are used as the raw cotton, the same procedure is performed.
  • the wrap is carded to separate the fibers one by one, and the web that is aligned in parallel is spun out. Then, this is focused and introduced into the calendar roll.
  • the amount of static electricity generated by the web 52 at this time is preferably measured at the measurement position 53 shown in FIG.
  • the amount of static electricity generated on the web spun from the card machine is measured directly above the web (25 mm above the web) using "Simco-Ion static electricity measuring device ELECTROSTATIC FIELDMETER FMX-003" manufactured by Simco Japan.
  • the web spun after the wrap is carded in the carding process will wind up and cannot be introduced into the calendar roll. Moreover, even if it can be introduced into a calendar roll, it is not possible to obtain a string-shaped card sliver with a high degree of proportion.
  • the atmospheric temperature is usually preferably in the range of 15 to 45 ° C.
  • the humidity is usually preferably in the range of 45 to 75%.
  • the polyimide staple fiber supplied to the mixed cotton step the polyimide staple fiber to which an oil agent of 0.05 to 0.3 mass% with respect to the fiber mass is applied is used in the card process. It becomes possible to more reliably control the amount of static electricity generated on the web.
  • the fibers are aligned in parallel. It is possible to obtain a card sliver with a high degree of proportion.
  • a method for obtaining a sliver containing 50% by mass or more of polyimide short fibers is shown, but the second fiber (cellulose fiber or the like) is contained in 50% by mass or more (particularly 60% by mass or more).
  • the sliver is obtained, it can also be produced by a known method.
  • the card sliver obtained above can be obtained by stretching a plurality of card slivers together in the kneading step to obtain a kneading sliver having no thickness unevenness. As a result, it is possible to obtain a high-quality spun yarn without thickness unevenness.
  • the kneading process can be carried out according to the conditions and the like in the known kneading process. It was
  • a double-layer structure spun yarn is manufactured using the kneaded sliver obtained as described above, a plurality of kneaded slivers are further used, and at least one kneaded sliver is used as a core sliver, and the other sliver is used.
  • a step (coarse spinning step) of obtaining a blister yarn having a two-layer structure is performed by spinning the kneaded strip sliver as a sheath sliver while winding it around the core sliver.
  • Production Method Example 1 A sliver S1 and a sliver S2 are prepared, the sliver S1 is used as a core portion, and the sliver S2 is wound around the sliver S1 to be roughly spun so as to form a sheath portion, and then spun to form the sheath portion of the present invention.
  • a two-layer structure spun yarn can be obtained.
  • the two-layer structure spun yarn of the present invention (example in the case of spun yarn A) can also be obtained by the production method Example 2 shown below.
  • Manufacturing method example 2 A sliver S1 and a sliver S2 are supplied to a sliver to form a blister yarn (crude yarn S1 and blister yarn S2), and then the blister yarn S1 is used as a core portion and the blister yarn S2 is wound around the blister yarn S1.
  • the two-layer structure spun yarn of the present invention can be obtained by spinning so as to form a sheath portion.
  • the sliver S1 and the sliver S2 are supplied as shown in FIG. 3, and the flyer head of the sliver S1 with respect to the draft direction in FIG. 3 is supplied.
  • the traveling angle ⁇ is set to 60 °, and the sliver S2 is wound around the sliver S1 and wound while giving a false twisting effect by the fryer. Thread) can be formed.
  • the spun yarn B is manufactured according to the manufacturing method Example 1, the sliver S1 and the sliver S2 are interchanged and supplied so that the sliver S2 becomes the core portion and the sliver S1 becomes the sheath portion. Can be formed.
  • "twist” is applied and the “crude thread” is wound around the bobbin.
  • the number of twists in these rough spinning processes is not limited, but it is preferable to set the number of twists so as not to cause drawing defects in the spinning process of the next step.
  • the twist coefficient can be adjusted to about 0.4 to 1.5.
  • the blister yarn produced in the roving process can be further used in the scouring process.
  • the blister yarn is twisted and stretched to obtain a spun yarn having a predetermined strength.
  • the number of twists in the spinning process is not particularly limited, but the twist coefficient K is preferably in the range of 3.0 to 6.0, particularly 3.4, from the viewpoint of physical characteristics (strength, fluff, etc.) or texture. It is more preferably in the range of ⁇ 5.0.
  • a sweet twist having a twist coefficient K of less than 3.0 may cause the yarn to come off, or the physical properties (particularly pilling) of the woven or knitted fabric may deteriorate.
  • the twist coefficient K is increased, a certain degree of strength improvement and improvement of crispness can be achieved, but if it exceeds 6.0, there are drawbacks such as deterioration of productivity, texture hardening, poor seams, and snails. It may be easy to connect.
  • twist coefficient K number of twists (number of times / 2.54 cm) / ⁇ (English cotton count)
  • the woven and knitted fabric of the present invention contains the spun yarn of the present invention as described above.
  • the content ratio of the spun yarn of the present invention in the woven and knitted fabric of the present invention is preferably 60% by mass or more, and when heat resistance, chemical resistance, abrasion resistance and the like are more important, it is 80% by mass or more. It is more preferable, and more preferably 100% by mass.
  • the polyimide staple fibers are formed on the sheath portion so that the polyimide staple fibers are on the fiber surface. It is preferable to use a two-layer structure spun yarn (spun yarn A) in which the above is arranged. On the other hand, when the soft texture or dyeability is important, a two-layer structure spun yarn (spun yarn B) in which polyimide fibers are arranged in the core portion and the second staple fibers are arranged so as to be on the fiber surface is used. Is preferable.
  • the structure, basis weight, etc. of the woven and knitted fabric may be appropriately selected according to the purpose of use, the purpose of use, and the like.
  • a structure such as plain weave, twill, double weave, or ripstop is preferable. Since these tissues have less floating of threads, they are difficult to ventilate and can prevent the passage of heat or flame. Also, if it is too light (too thin), these performances will be poor, and if it is too heavy (too thick), comfort will be impaired.
  • the basis weight of the woven and knitted fabric of the present invention is not limited, but is usually preferably in the range of 100 to 500 g / m 2 . Further, the flameproof clothing is particularly preferably in the range of 250 to 350 g / m 2 .
  • the woven fabric obtained by using at least one of a single type spun yarn or the spun yarn A as the warp and weft as the spun yarn of the present invention has flammability and heat as an index showing excellent heat resistance. It has excellent transmission and wear strength.
  • various processing for example, calendar processing, brushing processing, water absorption processing, water repellent processing, antistatic processing, shrink-proof processing, antibacterial processing, etc. Deodorizing processing, etc. may be applied.
  • ⁇ Strong wear> Using the obtained woven fabric, it was evaluated by the number of times until the fabric was broken at a pressing load of 4.45 N by the A-1 method (planar method) of the A method (universal type method) of JIS L 1096: 2010.
  • ⁇ Texture> Using the obtained woven fabric, the presence or absence of a soft texture was evaluated by the touch of a panelist in the following three stages. ⁇ ; It is smooth to the touch and has excellent softness that can be used for clothing. ⁇ : It has a softness but a feeling of stiffness. ⁇ : It does not have softness and is not suitable for use in clothing.
  • ⁇ Stainability> The woven fabrics obtained in Examples and Comparative Examples were used and evaluated visually by a panelist in the following two stages. ⁇ ; It is dyed in a desired color. X; Not dyed in the desired color (light color).
  • Example 1 (Sliver S1) 62.5% by mass of polyimide short fibers and 37.5% by mass of flame-retardant rayon fibers were mixed and put into a cotton-blown cotton machine to obtain a sheet-shaped wrap. At this time, 0.1% by mass of the polyoxyethylene / alkyl ether-based nonionic surfactant "Marpoteron LE” (manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.) was added to the polyimide staple fibers as an oil agent before being put into the blending cotton machine. It was given so as to be the amount of adhesion of. Then, the ambient temperature and humidity near the card process are maintained at a temperature of 25 to 27 ° C.
  • the wrap obtained in the cotton carder process is put into a card machine as shown in FIG. 1 and inside the card machine.
  • the web was spun.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.05 to ⁇ 0.01 kv.
  • the web spun from the card machine was well focused and pressed with a calendar roll to give a well-proportioned card sliver.
  • a card sliver was introduced into a combing machine, and finer and shorter fibers were removed from the card sliver, and a combing process was performed to increase the parallelism and uniformity of the fibers.
  • sliver S1 was prepared as a sliver for the core portion, and a sliver S2 was prepared as a sliver for the sheath portion.
  • a sliver S1 for a core portion and a sliver S2 for a sheath portion are supplied, and the mass ratio of each sliver after stretching is S1.
  • S2 40: 60
  • the traveling angle ⁇ of the core sliver S1 to the fryer head with respect to the draft direction in FIG. 2 is 60 °
  • a crude yarn having a twist number of 0.977 times / 2.54 cm was obtained (0.9144 m).
  • This blister thread is passed through the trumpet (guide) of the spinning machine, passed through the back roller, apron, and front roller in that order, and stretched 30.95 times, and then twisted 20.8 times / 2.54 cm in the Z direction.
  • a 2/1 right twill loom having a warp density of 67 yarns / 2.54 cm and a weft density of 66 yarns / 2.54 cm was obtained by an air jet loom.
  • the woven fabric was prepared by reaction dyeing under the following dyeing conditions. (Degluing conditions) Using Biotex 5 g / L and Sunmol FL 1 g / L as enzyme glue removers, the test was carried out at a bath ratio of 1:50 under the conditions of 60 ° C. ⁇ 90 minutes.
  • Example 2 (Sliver S1) 80% by mass of polyimide short fibers and 20% by mass of flame-retardant rayon fibers were mixed and put into a cotton-blown cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.2% by mass with respect to the total amount of the fibers.
  • the card process, the combing process, and the kneading process were performed under the same conditions as in Example 1 to obtain a sliver S1.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.05 to ⁇ 0.01 kv.
  • Example 2 The same as in Example 1 was used.
  • a sliver S1 was prepared as a sliver for the core portion, and a sliver S2 was prepared as a sliver for the sheath portion.
  • Spinning was carried out in the same manner as in Example 1 to obtain a double-layer structure spun yarn (spun yarn B) having a count of 30 (English cotton count). Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a double yarn of a two-layer structure spun yarn (30/2 count).
  • a woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Example 3 (Sliver S1) 62.5% by mass of polyimide fiber and 37.5% by mass of flame-retardant rayon fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.05% by mass with respect to the total amount of the fibers.
  • the card process, the combing process, and the kneading process were performed under the same conditions as in Example 1 to obtain a sliver S1.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.20 to ⁇ 0.10 kv.
  • Example 2 The same as in Example 1 was used.
  • a sliver S1 was prepared as a sliver for the core portion, and a sliver S2 was prepared as a sliver for the sheath portion.
  • Spinning was carried out in the same manner as in Example 1 to obtain a double-layer structure spun yarn (spun yarn B) having a count of 30 (English cotton count). Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a double yarn of a two-layer structure spun yarn (30/2 count).
  • a woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Example 4 (Sliver S1) 62.5% by mass of polyimide fiber and 37.5% by mass of flame-retardant vinylon fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.1% by mass with respect to the total amount of the fibers.
  • the card process, the combing process, and the kneading process were performed under the same conditions as in Example 1 to obtain a sliver S1.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.05 to ⁇ 0.01 kv.
  • (Sliver S2) Sliver S2 was obtained through a mixed cotton step, a carding step, and a kneading step using only flame-retardant vinylon fiber.
  • a sliver S1 was prepared as a sliver for the core portion
  • a sliver S2 was prepared as a sliver for the sheath portion.
  • a roving machine having the structures shown in FIGS. 1 (schematic cross section) and 2 (schematic cross section)
  • a sliver S1 for a core portion and a sliver S2 for a sheath portion are supplied, and the mass ratio of each sliver after stretching is S1.
  • Example 5 (Sliver S1) 62.5% by mass of polyimide fiber and 37.5% by mass of flame-retardant acrylic fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.2% by mass with respect to the total amount of the fibers.
  • the card process, the combing process, and the kneading process were performed under the same conditions as in Example 1 to obtain a sliver S1.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.10 to ⁇ 0.05 kv.
  • (Sliver S2) Sliver S2 was obtained through a mixed cotton step, a card step, and a kneading step using only flame-retardant acrylic fiber.
  • a sliver S1 was prepared as a sliver for the core portion
  • a sliver S2 was prepared as a sliver for the sheath portion.
  • a roving machine having the structures shown in FIGS. 1 (schematic cross section) and 2 (schematic cross section)
  • a sliver S1 for a core portion and a sliver S2 for a sheath portion are supplied, and the mass ratio of each sliver after stretching is S1.
  • Example 6 (Sliver S1) 37.5% by mass of polyimide fiber and 62.5% by mass of flame-retardant rayon fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.1% by mass with respect to the total amount of the fibers.
  • the card process, the combing process, and the kneading process were performed under the same conditions as in Example 1 to obtain a sliver S1.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.05 to ⁇ 0.01 kv.
  • a sliver S1 was prepared as a sliver for the core portion, and a sliver S2 was prepared as a sliver for the sheath portion.
  • a sliver S1 for a core portion and a sliver S2 for a sheath portion are supplied, and the mass ratio of each sliver after stretching is S1.
  • S2 40: 60, and the traveling angle ⁇ of the core sliver S1 to the flyer head with respect to the draft direction in FIG.
  • Spinning was carried out under the same conditions as in Example 1 except that this blister yarn was used to obtain a double-layer structure spun yarn (spun yarn A) having a count of 30 (English cotton count). Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a double yarn of a two-layer structure spun yarn (30/2 count).
  • a woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Example 8 A sheet-shaped wrap was obtained by putting 100% by mass of polyimide fiber into a blending cotton machine.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.1% by mass with respect to the total amount of the fibers.
  • the card process, the combing process, and the kneading process were performed under the same conditions as in Example 1 to obtain a card sliver.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.10 to ⁇ 0.05 kv.
  • This blister yarn was subjected to a spinning frame in the same manner as in Example 1 to obtain a spun yarn having a count of 30 (English cotton count). Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a twin yarn of a spun yarn (30/2 count). A woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Example 9 In the production of the sliver S1 of the first embodiment, the sliver S1 was obtained in the same manner as in the first embodiment except that the card sliver was obtained and then subjected to the kneading step without going through the combing step.
  • (Sliver S2) The same as the sliver S2 of Example 1 was used.
  • a sliver S1 was prepared as a sliver for the core portion, and a sliver S2 was prepared as a sliver for the sheath portion. .. Then, two yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a double yarn of a two-layer structure spun yarn (30/2 count).
  • a woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Example 10 The sliver S2 (100% flame-retardant rayon fiber) of Example 1 was used.
  • (Sliver S2) In the production of the sliver S1 of Example 6, the sliver S2 (100% polyimide staple fiber) was obtained in the same manner as in Example 6 except that the card sliver was obtained and then subjected to the kneading step without going through the combing step. rice field.
  • a two-layer structure spun yarn (spun yarn A) having a count of 30 (English cotton count) was obtained. Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a double yarn of a two-layer structure spun yarn (30/2 count).
  • a woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Comparative Example 1 (Sliver S1) 62.5% by mass of polyimide fiber and 37.5% by mass of flame-retardant rayon fiber were mixed and put into a mixed cotton machine to obtain a sheet-shaped wrap. At this time, the polyimide short to be put into the mixed cotton machine. No oil was applied to the fibers in advance. Then, the atmospheric temperature and humidity in the vicinity of the card process were set to the same conditions as in Example 1, and the wrap obtained in the mixed cotton card process was put into the card machine. For this reason, when the fibers combed from the doffer part of the card machine become a sheet (web), both ends of the web are rolled up by static electricity, causing poor focusing (spots due to cutting and folding), and the card sliver is used.
  • Comparative Example 2 (Sliver S1) 80% by mass of polyimide fiber and 20% by mass of flame-retardant rayon fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.02% by mass with respect to the total amount of the fibers.
  • the atmospheric temperature and humidity in the vicinity of the card process were set to the same conditions as in Example 1, and the wrap obtained in the mixed cotton card process was put into the card machine.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.50 to ⁇ 0.30 kV. Therefore, as in Comparative Example 1, the web focusing failure occurred in the card machine, and the card sliver could not be obtained.
  • Comparative Example 3 (Sliver S1) 62.5% by mass of polyimide fiber and 37.5% by mass of flame-retardant rayon fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.4% by mass with respect to the total amount of the fibers.
  • the atmospheric temperature and humidity in the vicinity of the card process were set to the same conditions as in Example 1, and the wrap obtained in the mixed cotton carding process was put into the card machine to obtain a card sliver.
  • the amount of static electricity generated in the web spun from the card machine was 0.00 kV, and a card sliver could be obtained.
  • the obtained card sliver was subjected to the kneading process, the fibers were frequently rolled up on the top roller (rubber) from the amount of passing cotton of about 20 kg, and operation defects frequently occurred.
  • the top roller When observing the surface of the top roller, it was discolored and sticky due to the influence of the oil agent, which affected the passing fibers. For this reason, it was not possible to obtain a kneading sliver.
  • Example 4 Comparative Example 4
  • the sliver S2 (100% flame-retardant rayon fiber) used in Example 1 was used.
  • (Sliver S2) 40.0% by mass of polyimide fiber and 60.0% by mass of flame-retardant rayon fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.1% by mass with respect to the total amount of the fibers.
  • the card process, the combing process, and the kneading process were performed under the same conditions as in Example 1 to obtain a sliver S2.
  • a sliver S1 was prepared as a sliver for the core portion, and a sliver S2 was prepared as a sliver for the sheath portion.
  • the rough spinning machine having the structures shown in FIGS. 1 (schematic cross section) and 2 (schematic cross section)
  • the sliver S1 for the core portion and the sliver S2 for the sheath portion are supplied, and the mass ratio of each sliver after stretching is supplied.
  • S1: S2 60: 40, and the traveling angle ⁇ of the sliver S1 for the core portion with respect to the draft direction to the flyer head in FIG.
  • a crude yarn having a twist number of 0.984 times / 2.54 cm was obtained (0.9144 m).
  • Spinning was carried out under the same conditions as in Example 1 except that this blister yarn was used to obtain a double-layer structure spun yarn (spun yarn A) having a count of 30 (English cotton count). Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a double yarn of a two-layer structure spun yarn (30/2 count).
  • a woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Comparative Example 5 (Sliver S1) 62.5% by mass of aramid fiber and 37.5% by mass of flame-retardant rayon fiber were mixed and put into a blending cotton machine without adding an oil agent to obtain a sheet-shaped wrap. Other than that, the wrap obtained in the cotton carder step was put into a card machine under the same conditions as in Example 1 to obtain a card sliver. (Sliver S2) The sliver S2 used in Example 1 was used.
  • a sliver S1 was prepared as a sliver for the core portion and a sliver S2 was prepared as a sliver for the sheath portion, and spinning was performed in the same manner as in Example 1 to obtain a 30-count (English-style cotton count) two-layer structure spun yarn. .. Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a double yarn of a two-layer structure spun yarn (30/2 count). A woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Comparative Example 7 25% by mass of polyimide fiber and 75% by mass of flame-retardant rayon fiber were mixed and put into a blending cotton machine to obtain a sheet-shaped wrap.
  • the same oil agent as in Example 1 was previously applied to the polyimide staple fibers to be charged into the blended cotton machine at a ratio of 0.05% by mass with respect to the total amount of the fibers.
  • a card sliver was obtained through the card process in the same manner as in Example 1.
  • the amount of static electricity generated in the web spun from the card machine was ⁇ 0.05 to ⁇ 0.01 kv.
  • This blister yarn was subjected to a spinning frame in the same manner as in Example 1 to obtain a spun yarn having a count of 30 (English cotton count). Two of these yarns were combined and twisted 16 times / 2.54 cm in the S direction to obtain a twin yarn of a spun yarn (30/2 count). A woven fabric was obtained in the same manner as in Example 1 except that the obtained twin yarn was used.
  • Test Example 1 The spun yarns and woven fabrics obtained in Examples and Comparative Examples were measured or evaluated according to the above-mentioned measuring method and evaluation method. The results are shown in Tables 2 to 3. Table 1 shows the manufacturing conditions and configurations of each spun yarn and woven fabric.
  • the spun yarns obtained in Examples 1 to 8 have excellent heat resistance, chemical resistance, and abrasion resistance, which are excellent properties of the polyimide fiber, and also have excellent properties. It was possible to give a soft texture to the obtained woven and knitted fabric. Among them, the woven fabrics obtained from the spun yarns obtained in Examples 1 to 5 were excellent in dyeability in addition to the soft texture. Further, since the spun yarns obtained in Examples 6 to 8 were particularly excellent in heat resistance and abrasion strength, the obtained woven fabric was sufficiently imparted with these performances.

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Abstract

Le problème décrit par la présente invention est de fournir un filé contenant des fibres courtes de polyimide dans lequel une quantité prescrite de fibres courtes de polyimide est utilisée, le filé contenant des fibres courtes de polyimide possédant une résistance supérieure à la chaleur, aux produits chimiques et à l'usure, et permettant de fabriquer un tissu tissé ou tricoté dont la texture est douce. La solution selon l'invention concerne un filé contenant des fibres courtes de polyimide, ledit filé étant caractérisé en ce que (1) le filé comprend des faisceaux de fibres courtes à base de polyimide dans lesquels la teneur en fibres courtes de polyimide est d'au moins 50 % en masse et (2) la teneur en fibres courtes de polyimide du filé est d'au moins 20 % en masse.
PCT/JP2021/037848 2020-10-13 2021-10-13 Filé et son procédé de fabrication Ceased WO2022080401A1 (fr)

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JPH073557A (ja) * 1993-06-08 1995-01-06 Mitsubishi Rayon Co Ltd 複合材料補強用繊維
JP2004011052A (ja) * 2002-06-06 2004-01-15 Du Pont Toray Co Ltd 被覆糸およびそれらからなる繊維製品
JP2004011060A (ja) * 2002-06-07 2004-01-15 Du Pont Toray Co Ltd 防護手袋
JP2004176212A (ja) * 2002-11-27 2004-06-24 Unitika Ltd 糸斑の低減されたポリイミド繊維及びその製造方法
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