US20180228225A1 - Garment having antistatic capability - Google Patents

Garment having antistatic capability Download PDF

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Publication number
US20180228225A1
US20180228225A1 US15/951,390 US201815951390A US2018228225A1 US 20180228225 A1 US20180228225 A1 US 20180228225A1 US 201815951390 A US201815951390 A US 201815951390A US 2018228225 A1 US2018228225 A1 US 2018228225A1
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US
United States
Prior art keywords
mass
fiber
garment
conductive
conductive fiber
Prior art date
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Abandoned
Application number
US15/951,390
Inventor
Shingo NAKAHASHI
Masashi FUKADA
Atsushi Ide
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Mitsubishi Chemical Corp
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Mitsubishi Chemical Corp
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Filing date
Publication date
Application filed by Mitsubishi Chemical Corp filed Critical Mitsubishi Chemical Corp
Assigned to MITSUBISHI CHEMICAL CORPORATION reassignment MITSUBISHI CHEMICAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKADA, Masashi, IDE, ATSUSHI, NAKAHASHI, Shingo
Publication of US20180228225A1 publication Critical patent/US20180228225A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/008—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting against electric shocks or static electricity
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/0007—Electro-spinning
    • D01D5/0015—Electro-spinning characterised by the initial state of the material
    • D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
    • D01D5/0046—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion the fibre formed by coagulation, i.e. wet electro-spinning
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/09—Addition of substances to the spinning solution or to the melt for making electroconductive or anti-static filaments
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/08—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyacrylonitrile as constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
    • D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
    • 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
    • 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
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/441—Yarns or threads with antistatic, conductive or radiation-shielding properties
    • 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
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/46—Sewing-cottons or the like
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/26—Electrically protective, e.g. preventing static electricity or electric shock
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/26—Polymers or copolymers of unsaturated carboxylic acids or derivatives thereof
    • D06M2101/28—Acrylonitrile; Methacrylonitrile
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/10—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/16—Physical properties antistatic; conductive

Definitions

  • a sewing thread (linking thread) used in sewing clothing items in the present invention is a thread in which a synthetic fiber having an antistatic capability and capable of being dyed is used, and the present invention also relates to a garment having the antistatic capability by using the thread.
  • Static electricity tends to accumulate in a heat-retention clothing for the winter season as a wearer moves, and electrostatic discharge emerged at the time of undressing leads to an uncomfortable feeling.
  • the antistatic function is deteriorated by repeating washing.
  • a fiber having the antistatic capability is a colored fiber containing carbon, titanium oxide or metallic materials, and even when the fiber is dyed, a woven or knitted fabric having a brilliant color can not be obtained. Therefore, a development of a woven or knitted fabric which keeps the antistatic capability without deteriorating a quality of clothing items is required.
  • Patent Document 1 a sewing machine thread manufactured by twisting at least one composite yarn which has a structure of covering a thermoplastic fiber as a core part with a conductive fiber as a sheath part is described.
  • a covering with the sheath part consisting of the conductive fiber it lacks homochromy after dying.
  • Patent Document 2 a method for obtaining an antistatic clothing by sewing together woven fabrics containing the conductive fiber with a thread containing the conductive fiber is described.
  • the antistatic capability of a knitted fabric containing the conductive fiber is conventionally known.
  • the objective of the present invention is to provide a garment having an antistatic capability and washing durability not by using a conductive fiber or incorporating a few amount of the conductive fiber in a part which becomes a wearing part when manufacturing a woven or knitted fabric, or not by applying an antistatic treatment on the woven or knitted fabric, but by incorporating the conductive fiber in a sewing thread.
  • the garment of the present invention is the one in which each woven or knitted fabric part is sewn with a sewing thread containing a conductive fiber, a content of the conductive fiber in the sewing thread is 30 mass %-100 mass %, a content of the conductive fiber in each woven or knitted fabric part is 1 mass % or less, and a frictional charge amount is 0.8 ⁇ C/garment or less.
  • an electric resistance value is 1 ⁇ 10 4 ⁇ -5 ⁇ 10 8 ⁇ per 1 cm length of the conductive fiber in a fiber axis direction.
  • a content of the sewing thread with respect to a total mass of the garment is 2 mass %-8 mass %.
  • a content of the conductive fiber with respect to a total mass of the garment is 2 mass %-8 mass %.
  • the sewing thread is used in at least one part among a shoulder part, a sleeve part, a collar part, a side part, an armhole part, a hem part and a cuff part.
  • the sewing thread is a spun yarn.
  • a single fiber fineness of the conductive fiber is 1 dtex-15 dtex.
  • a fiber length of a single fiber of the conductive fiber contained in the spun yarn is 30 mm-200 mm.
  • a yarn count of a single spun yarn has a metric count of 20-110, the number of fuzz which is 1 mm or longer in a single spun yarn is 130/m or more, and the spun yarn is two-folded yarn or three-folded yarn.
  • the number of fuzz which is 3 mm or longer is 10/m or more, and the number of fuzz which is 5 mm or longer is 1/m or more in the single spun yarn.
  • the conductive fiber contains 5 mass %-9 mass % of carbon black or 10 mass %-25 mass % of conductive titanium oxide.
  • the conductive fiber is a sheath-core type acrylic fiber containing a conductive material in a core part.
  • the garment of the present invention is a sweater or a fleece.
  • the sewing thread of the present invention contains 30 mass %-100 mass % of the conductive fiber.
  • the sewing thread contains the conductive fiber
  • the garment of the present invention is the one in which each woven or knitted fabric part is sewn with a sewing thread containing a conductive fiber, a content of the conductive fiber in the sewing thread is 30 mass %-100 mass %, a content of the conductive fiber in each woven or knitted fabric part is 1 mass % or less, and a frictional charge amount is 0.8 ⁇ C/garment or less.
  • a garment is formed by joining a front body, a back body, sleeves and a collar with a sewing thread.
  • woven or knitted fabric parts mean parts composing a garment; for example, a front body, a back body, sleeves and a collar.
  • a sewing thread is often referred to as “a linking thread” and sewing is often referred to as “linking”.
  • the present invention also includes these meaning of terms.
  • a part where a front body and a back body are sewn means a “side part” and a “shoulder part”
  • a part where the bodies and a sleeve are sewn means an “armhole part”
  • a part where the bodies and a collar are sewn means a “collar part”
  • a part where a sleeve is sewn to be a tubular shape means a “sleeve part”
  • a part where a tip end of the sleeve is folded and sewn means a “cuff part”
  • a lower end of bodies means a “hem part”.
  • a content of the conductive fiber with respect to a sewing thread is 30 mass % or more, corona discharge from the conductive fiber is sufficiently performed in wearing. Therefore, static electricity is hard to accumulate in the garment, and an uncomfortable feeling due to an electric discharge in undressing can be decreased.
  • a content of the conductive fiber with respect to the sewing thread is preferably 50 mass % or more, more preferably 80 mass % or more, and most preferably 100 mass %. Since the electricity in a sheath-core type conductive fiber is eliminated by corona discharge, increasing a fiber cross-section leads to a capability improvement. Therefore, an increase of a mixture rate of the conductive fiber in a spun yarn has an influence on the effectiveness.
  • a content of the conductive fiber with respect to each woven or knitted fabric part is 1 mass % or less, it is preferable since a color of the conductive fiber does not have an influence on a garment. More preferably, a content of the conductive fiber in each woven or knitted fabric part is 0 mass %, i.e. the conductive fiber is not contained.
  • the frictional charge amount is more preferably 0.7 ⁇ C/garment or less, and further more preferably 0.6 ⁇ C/garment or less.
  • 0.6 ⁇ C/garment or less of a frictional charge amount is a standard for an antistatic workwear prescribed in JIS T8118 (year 2001).
  • the conductive fiber used in the sewing thread is not limited in particular, as far as a frictional charge amount of a garment becomes 0.8 ⁇ C/garment or less.
  • Examples of the conductive fiber are; chemical fibers containing conductive materials in the fiber, a fiber in which a surface is coated with conductive materials, and metallic fibers.
  • an electric resistance value of the contained conductive fiber is 1 ⁇ 10 4 ⁇ -5 ⁇ 10 8 ⁇ , and 30 mass %-100 mass % of the conductive fiber is contained.
  • an electric resistance value of the conductive fiber of 1 ⁇ 10 4 ⁇ or more it is preferable since conductivity is high and a mixture rate in the spun yarn can be lowered, and in a case that an electric resistance value of the conductive fiber is 5 ⁇ 10 8 ⁇ or less, it is preferable in light of cost.
  • an electric resistance value of the conductive fiber is more preferably 1 ⁇ 10 5 ⁇ -5 ⁇ 10 7 ⁇ .
  • a preferable content of the sewing thread in a garment is 2 mass %-8 mass %, though it changes according to a structure such as a size of a product, and presence or absence of sleeves.
  • a content of the sewing thread containing the conductive fiber in the garment is 2 mass % or more, it is preferable in light of a high electric discharge effect of static electricity and in light of decreasing an uncomfortable feeling in undressing. In a case that a content of the sewing thread containing the conductive fiber in the garment is 8 mass % or less, it is preferable in light of effectiveness for cost reduction of sewing products in total. From the above standpoint, a content of the sewing thread containing the conductive fiber in a garment is more preferably 3 mass %-6 mass %.
  • a content of the conductive fiber with respect to a total mass of the garment is 2 mass %-8 mass %.
  • a content of the conductive fiber with respect to the total mass of the garment is 2 mass % or more, it is preferable in light of decreasing an uncomfortable feeling in undressing since the electric discharge effect of static electricity is high.
  • a content of the conductive fiber with respect to a total mass of the garment is 8 mass % or less, it is preferable in light of effects of cost reduction of sewing product in total. From the above standpoint, a content of the conductive fiber with respect to a total mass of the garment is more preferably 3 mass %-6 mass %.
  • the sewing thread is used in at least one part among a shoulder part, a side part, an armhole part, a sleeve part, a collar part, and a hem part.
  • the sewing thread is not limited to the one used for sewing the garment and included in the garment, and the sewing thread may be sewn to the garment apart from the sewing thread for sewing the garment.
  • the sewing thread is preferably used in at least a sleeve part, a side part, a shoulder part and an armhole part, more preferably used also in a collar part or a cuff part, and further more preferably used in all the sewn parts.
  • the sewing thread is often used at a side part, a shoulder part, a sleeve part and a collar part, and it is effective to be used where a movable region is large, such as a side part, a shoulder part and a sleeve part.
  • the sewing thread to be used is a spun yarn.
  • the sewing thread is composed of a spun yarn, thereby the conductive fiber can be distributed not only on a surface of the thread but also in a whole thread, and a content of the conductive fiber with respect to the sewing thread can be changed depending on its frictional charge amount. Further, since a short fiber is used, the number of end parts in the conductive fiber increases, and corona discharge can be effectively performed.
  • a single fiber fineness of the conductive fiber is 1 dtex-15 dtex.
  • a spun yarn count can be increased.
  • a single fiber fineness of the conductive fiber is 15 dtex or less, it is preferable since the strength of the spun yarn manufactured can be improved. From the above standpoint, a single fiber fineness of the conductive fiber is more preferably 3 dtex-11 dtex.
  • a fiber length of a single fiber of the conductive fiber is 30 mm-200 mm.
  • a fiber length of a single fiber of the conductive fiber is 30 mm or longer, mixing with cotton or other chemical synthetic fibers can be easy.
  • a fiber length of a single fiber of the conductive fiber is 200 mm or shorter, mixing with wool becomes possible, and a spun yarn can be manufactured by using various spinning methods such as cotton spinning or worsted spinning.
  • it is more preferable that a single fiber fineness is 3 dtex-11 dtex and a fiber length of a single fiber is 35 mm-120 mm.
  • a yarn count of a single spun yarn is a metric count (NM) of 20-110.
  • a single spun yarn for a sewing thread is manufactured within a range of a metric count of 20-110.
  • a processed yarn obtained by the two-folded yarn processing after manufacturing a single spun yarn of a metric count of 20-40 is used.
  • a processed yarn obtained by the three-folded yarn (three-twisted yarn) processing after manufacturing a single spun yarn of a metric count of 90-105 is used.
  • a polyester short fiber is used in light of the thread strength of the spun yarn.
  • the number of fuzz having a length of 1 mm or longer is 130/m or more, since corona discharge from a fiber cross section, which is a characteristic of the conductive fiber, can be sufficiently performed.
  • an upper limit of the number is 300/m or less in light of passability in processing steps.
  • the number of fuzz with a length of 3 mm or longer in a single spun yarn is 10/m or more and the number of fuzz with a length of 5 mm or longer is 1/m or more.
  • corona discharge from the fiber cross section which is a characteristic of the conductive fiber, can be sufficiently performed, and it is preferable.
  • the upper limit of the number of fuzz with a length of 3 mm or longer is 100/m or less and an upper limit of the number of fuzz with a length of 5 mm or longer is 10/m or less.
  • the number of fuzz can be increased by decreasing the number of twisting of a single spun yarn. It should be noted that, since the strength of the thread decreases as the number of twisting decreases, the number of twisting may be set appropriately to balance the both.
  • the conductive fiber is a fiber containing 5 mass %-9 mass % of carbon black, or 10 mass %-14 mass % of conductive titanium oxide.
  • the carbon black is preferable since conductive capability of the fiber can be easily increased.
  • a fiber of conductive titanium oxide has lower conductive capability than the one of carbon black, while it is inconspicuous when it is included in a garment due to its gray color.
  • the conductive fiber is a sheath-core type acrylic fiber which contains a conductive material in the core part in light of conductive capability, color, prevention of dropping of the conductive material in processing, and possibility of maintaining and enhancing conductivity even though washing is repeated.
  • the spun yarn used in the present invention can be obtained by a general cotton spinning method or a worsted spinning method.
  • the fiber forming a spun yarn 30-100 mass % of the conductive fiber, or the sheath-core type acrylic fiber is preferably contained with respect to the spun yarn and in addition, other fibers are mixed and spun.
  • an acrylic fiber or a polyester fiber is preferable to maintain the strength of the thread of the spun yarn.
  • a polyester fiber is more preferable as a counterpart for mixing.
  • an undiluted spinning solution for a sheath component and an undiluted spinning solution for a core component are prepared.
  • an organic solvent solution obtained by solving acrylic polymer in an organic solvent is prepared.
  • an organic solvent solution obtained by mixing conductive particles (A) and acrylic polymer (B) so as mass ratio (A)/(B) to be from 4 to 20 and solving the mixture in an organic solvent is prepared.
  • the acrylic polymers used for the undiluted spinning solutions for the sheath component and the core component are not limited in particular, and general acrylic polymers used in manufacturing conventional acrylic fibers can be used.
  • heat shrinkability by composition and relaxation of the acrylic polymer though depending on the monomer component to be copolymerized, generally, the less acrylonitrile content the polymer has, the higher heat shrinkability tends to be. Accordingly, it is desirable that a content of acrylonitrile in the undiluted spinning solution is appropriately adjusted so that a predetermined heat shrinkability can be obtained in the heat shrinking processing step thereafter.
  • a content of acrylonitrile in acrylic polymer is from 50 mass % to 98 mass %, particularly from 50 mass % to 95 mass %.
  • a content of acrylonitrile is less than 50 mass %, original characteristics of acrylic fiber such as dyeing clearness and chromogenic nature can not be effectively exhibited, and other physical properties including thermal characteristics tend to be deteriorated.
  • acrylonitrile is copolymerized with unsaturated monomers such as acrylic acid ester.
  • a content of acrylonitrile in the sheath part is from 50 mass % to 98 mass % as described above by copolymerizing with unsaturated monomer.
  • unsaturated monomers with which acrylonitrile is copolymerized is not limited in particular. However, for example, acrylic acid and acrylic acid esters, methacrylic acid and methacrylic acid esters, vinyl acetate, vinyl chloride, vinylidene chloride and the like can be used.
  • the acrylic fiber having a sheath-core structure stably without thread breakage in spinning while suppressing an exposure of the core part to the sheath part it is extremely important to adjust viscosity of the undiluted spinning solution of the sheath component. It is important that solid concentration and temperature in the undiluted spinning solution of the sheath component is controlled so as viscosity of the undiluted spinning solution of the sheath component to be 300 poise or less, preferably 150 poise or less.
  • the conductive particles (A) and the acrylic polymer (B) are mixed so as mass ratio (A)/(B) to be from 4 to 20 and solved in an organic solvent as described above.
  • mass ratio (A)/(B) By setting the value of the above mass ratio to be 4 or more, continuous phase of the conductive particles is stably formed in the acrylic fiber when manufacturing the conductive acrylic fiber, and the acrylic fiber can have sufficient conductive capability.
  • the above mass ratio (A)/(B) exceeds 20, dispersibility of the conductive particles or spinnability of the undiluted spinning solution are deteriorated in spinning, and breakage of the core part is likely to occur when picking up or drawing the coagulated yarn. Therefore, spinnability as well as conductivity of the acrylic fiber deteriorate.
  • the conductive particle contained in the undiluted spinning solution of the core component is metallic oxide whose conductivity in a powder form is 10 ⁇ 3 S/cm or more and has high whiteness.
  • conductive particles titanium oxide or zinc oxide can be preferably used, and in addition, for example, tin oxide, indium oxide, or titanium oxide in which a surface is covered with tin oxide or zinc oxide can also be used.
  • antimony oxide can be used together with tin oxide and indium oxide, and tin oxide, indium oxide, aluminum oxide, potassium oxide, germanium oxide and the like can be used together with zinc oxide.
  • a form of the conductive particles contained in the undiluted spinning solution is not limited in particular. However, it is preferable that, in a case that the particle is granular, mean particle size is 3 ⁇ m or smaller in light of stability in a filtration step of the undiluted solution and a spinning step in manufacturing the acrylic fiber.
  • organic solvent such as dimethylacetamide, dimethylformamide, dimethyl sulfoxide and the like is preferably used. However, it is not limited in particular, and other organic solvents used generally in spinning the acrylic fiber may be selected.
  • solid concentration and temperature of each undiluted spinning solution of the above sheath component and the core component are not limited in particular, too.
  • solid concentration in the undiluted spinning solution of the sheath component is 5 mass % or higher
  • solid concentration in the undiluted spinning solution of the core component is 30 mass % or higher.
  • spinning is conducted according to a wet spinning method with a sheath-core type spinning nozzle using the undiluted spinning solutions of the sheath component and of the core component prepared as above, setting a proportion between the sheath part and the core part so as a content of the conductive particles contained in the acrylic fiber to be from 5 mass % to 15 mass %.
  • a content of the conductive particles contained in the fiber is less than 5 mass %, targeted excellent conductive capability can not be added to the acrylic fiber since the conductive particles are a few.
  • a content of the conductive particles is beyond 15 mass %, there occurs a problem that the usage of a product is limited since the fiber whiteness is inferior when manufacturing the conductive acrylic fiber.
  • the wet spinning method can be conducted in the same manner as the method used generally in manufacturing the conventional acrylic fiber.
  • spinning can be conducted by extruding the undiluted spinning solution of the sheath component and the core component from the sheath-core type spinning nozzle into the coagulated liquid composed of the organic solvent and water, and solidifying.
  • the sheath-core type spinning nozzle it is preferable that a spinning nozzle having 3000 holes or more, particularly 5000 holes or more is used.
  • the spinning is conducted by using such a sheath-core type spinning nozzle having 3000 holes or more, thereby the conductive acrylic fiber can be manufactured with extremely high productivity.
  • each processing such as drawing, applying desolventizing agent and oil agent, drying and densification and the like is applied, then heat shrink processing is conducted in which the coagulated yarn is shrunk at shrink rate from 30% to 50%.
  • the processing method and the processing condition in each processing of drawing, applying the desolventizing agent and oil agent, drying and densification and the like is not limited in particular and can be changed appropriately if necessary.
  • drawing processing can be conducted in hot water at 80° C. or higher using desolventizing agent.
  • a draw ratio is preferably set to be 3-10 times and more preferably 4-7 times.
  • the conductive acrylic fibers were bonded to metal monads while distancing at precisely 1 cm intervals with silver paste (“DOTITE” manufactured by Fujikura Kasei Co., Ltd.).
  • DC voltage of 1000 V is applied between the metal monads under the atmosphere of temperature of 20° C. and relative moisture of 40 RH %. Then the resistance value between the metal monads was measured (“SM-8210” manufactured by former Toa Dempa Co., LTd.).
  • a product used in measurement was washed five times repeatedly by JIS L217 106 method, rinsed with injected water for 20 minutes, then tumble dried.
  • a frictional charge amount of the washed product was measured based on JIS T8118 method.
  • the fuzz in the spun yarn was measured based on JIS L1095 9.22.2 B method.
  • a spun yarn was manufactured by putting 100 mass % of conductive sheath-core type acrylic fiber (ET10 manufactured by Mitsubishi Rayon Co. Ltd., fineness: 3.3 dtex, fiber length: 38 mm) into a machine for a cotton spinning step.
  • the conductive sheath-core type acrylic fiber contains conductive titanium oxide in the core part, and a content of conductive titanium oxide with respect to a total fiber is 12 mass %.
  • the spinning rate of a carding machine is set to be 40 m/minute or lower and a draw ratio of a draw frame is set to be 8 times.
  • Spinning of the single spun yarn was conducted with a metric count of 32 and the number of twisting of 630 times/m in a spinning frame.
  • As a sensor for measuring yarn evenness used in rolling the single spun yarn not a normal capacitance method but an optical method was adopted.
  • a doubling step was conducted, and S-twisting was conducted for 400 times/m as the final twist with a twisting machine to make it two-folded yarn.
  • the sewing thread A was manufactured.
  • a knitted fabric of rib knitting structure with 12G was manufactured by using two-folded yarn with a yarn count of 2/32 by metric count made of 100% of wool.
  • a round neck sweater was manufactured by using the sewing thread A and the knitted fabric.
  • the sewn parts at which the sewing thread A was used were a sleeve part, a side part, a shoulder part, an armhole part and a collar part.
  • the sweater was dyed after sewn with black color and a black sweater was obtained. Then, a frictional charge amount of the black sweater was measured.
  • the composition of the garment is shown in Table 1 and the evaluation result is shown in Table 2.
  • a pink V neck sweater was obtained in the same manner as Example 1 except that a V-neck sweater was manufactured, and the dyeing after sewn was performed with a pale color, i.e. pink.
  • a frictional charge amount of the pink sweater was measured.
  • the composition of the garment is shown in Table 1 and the evaluation result is shown in Table 2.
  • a sweater was obtained in the same manner as Example 1 except that the sewing thread A was used for sewing a sleeve part, a side part, a shoulder part and an armhole part, and as for sewing a collar part, a sewing thread not containing the conductive fiber was used instead of the sewing thread A, as shown in Table 1.
  • the evaluation result is shown in Table 2.
  • Example 2 a sweater was obtained in the same manner as Example 1 except that the sewing thread A was used for sewing a sleeve part, a side part, a shoulder part, an armhole part and a cuff part.
  • the evaluation result is shown in Table 2.
  • a sweater was obtained in the same manner as Example 1 except that the sewing thread A was used for sewing a sleeve part, a side part, a shoulder part, an armhole part and a cuff part, a name tag with a size of 1 cm by 5 cm was sewn to an upper part of the back body with the sewing thread A, and dyeing after sewn was conducted with navy blue color.
  • the evaluation result was shown in Table 2.
  • a spun yarn B was manufactured in the same manner as Example 1 except that a content of conductive titanium oxide with respect to the total fiber was 20 mass %.
  • a round neck sweater was manufactured in the same manner as Example 1 except that the spun yarn B was used in a sleeve part, a side part, a shoulder part and an armhole part.
  • the composition of the garment is shown in Table 1 and the evaluation result is shown in Table 2.
  • a black sweater was obtained in the same manner as Example 1 except that instead of the conductive fiber in Example 1, non-conductive acrylic fiber (V 17, manufactured by Mitsubishi Rayon Co., Ltd., single fiber fineness: 3.3 dtex, fiber length: 38 mm) was used.
  • non-conductive acrylic fiber V 17, manufactured by Mitsubishi Rayon Co., Ltd., single fiber fineness: 3.3 dtex, fiber length: 38 mm

Abstract

Provided is a garment that has an antistatic capability and exhibits washing durability without, when producing a woven or knitted fabric, using a conductive fiber at a part that becomes a wearing part of the woven or knitted fabric, and without applying an antistatic treatment to the woven or knitted fabric, but rather by incorporating a conductive fiber into a sewing thread. The garment according to the present invention has a conductive fiber incorporated in a sewing thread (linking thread), and has a frictional charge amount of 0.8 μC or less per garment. The garment preferably has an electric resistance value of 1×104Ω-5×108Ω per 1 cm length of the conductive fiber in a fiber axis direction thereof, and the sewing thread preferably includes the conductive fiber in an amount of 30-100 mass %.

Description

    TECHNICAL FIELD
  • A sewing thread (linking thread) used in sewing clothing items in the present invention is a thread in which a synthetic fiber having an antistatic capability and capable of being dyed is used, and the present invention also relates to a garment having the antistatic capability by using the thread.
    • BACKGROUND ART
  • Due to a recent improvement of an air conditioning installation, temperature is kept comfortable in a working room, while humidity is set to be low. In the winter, humidity is also low both in and out of a room.
  • Static electricity tends to accumulate in a heat-retention clothing for the winter season as a wearer moves, and electrostatic discharge emerged at the time of undressing leads to an uncomfortable feeling. Though suppressing static electricity by antistatic treatment to clothing items is conventionally known, the antistatic function is deteriorated by repeating washing. Further, though there is also a suppression method by incorporating a fiber having the antistatic capability into a woven or knitted fabric, a fiber having the antistatic capability is a colored fiber containing carbon, titanium oxide or metallic materials, and even when the fiber is dyed, a woven or knitted fabric having a brilliant color can not be obtained. Therefore, a development of a woven or knitted fabric which keeps the antistatic capability without deteriorating a quality of clothing items is required.
  • In Patent Document 1, a sewing machine thread manufactured by twisting at least one composite yarn which has a structure of covering a thermoplastic fiber as a core part with a conductive fiber as a sheath part is described. However, due to a covering with the sheath part consisting of the conductive fiber, it lacks homochromy after dying.
  • In Patent Document 2, a method for obtaining an antistatic clothing by sewing together woven fabrics containing the conductive fiber with a thread containing the conductive fiber is described. However, the antistatic capability of a knitted fabric containing the conductive fiber is conventionally known.
    • PRIOR ART DOCUMENT Patent Documents
    • Patent Document 1: JP2010-255157 A
    • Patent Document 2: JP 2015-030934 A
    SUMMARY OF THE INVENTION Problem to be Solved by the Invention
  • The objective of the present invention is to provide a garment having an antistatic capability and washing durability not by using a conductive fiber or incorporating a few amount of the conductive fiber in a part which becomes a wearing part when manufacturing a woven or knitted fabric, or not by applying an antistatic treatment on the woven or knitted fabric, but by incorporating the conductive fiber in a sewing thread.
    • Means for Solving Problem
  • A summary of the present invention is as follows;
  • The garment of the present invention is the one in which each woven or knitted fabric part is sewn with a sewing thread containing a conductive fiber, a content of the conductive fiber in the sewing thread is 30 mass %-100 mass %, a content of the conductive fiber in each woven or knitted fabric part is 1 mass % or less, and a frictional charge amount is 0.8 μC/garment or less.
  • In the garment of the present invention, it is preferable that an electric resistance value is 1×104Ω-5×108Ω per 1 cm length of the conductive fiber in a fiber axis direction.
  • In the garment of the present invention, it is preferable that a content of the sewing thread with respect to a total mass of the garment is 2 mass %-8 mass %.
  • In the garment of the present invention, it is preferable that a content of the conductive fiber with respect to a total mass of the garment is 2 mass %-8 mass %.
  • In the garment of the present invention, it is preferable that the sewing thread is used in at least one part among a shoulder part, a sleeve part, a collar part, a side part, an armhole part, a hem part and a cuff part.
  • In the garment of the present invention, it is preferable that the sewing thread is a spun yarn.
  • In the garment of the present invention, it is preferable that a single fiber fineness of the conductive fiber is 1 dtex-15 dtex.
  • In the garment of the present invention, it is preferable that a fiber length of a single fiber of the conductive fiber contained in the spun yarn is 30 mm-200 mm.
  • In the spun yarn in the garment of the present invention, it is preferable that a yarn count of a single spun yarn has a metric count of 20-110, the number of fuzz which is 1 mm or longer in a single spun yarn is 130/m or more, and the spun yarn is two-folded yarn or three-folded yarn.
  • In the spun yarn in the garment of the present invention, the number of fuzz which is 3 mm or longer is 10/m or more, and the number of fuzz which is 5 mm or longer is 1/m or more in the single spun yarn.
  • In the garment of the present invention, it is preferable that the conductive fiber contains 5 mass %-9 mass % of carbon black or 10 mass %-25 mass % of conductive titanium oxide.
  • In the garment of the present invention, it is preferable that the conductive fiber is a sheath-core type acrylic fiber containing a conductive material in a core part.
  • It is preferable that the garment of the present invention is a sweater or a fleece.
  • The sewing thread of the present invention contains 30 mass %-100 mass % of the conductive fiber.
    • Effect of the Invention
  • Since the sewing thread contains the conductive fiber, a garment in which static electricity does not accumulate when wearing and undressing the garment, a frictional charge amount in undressing is 0.8 μC/garment or less, and then an uncomfortable feeling due to static electricity decreases can be commercially provided, even if the conductive fiber is less contained in the woven or knitted fabric part.
    • MODE(S) FOR CARRYING OUT THE INVENTION
  • The garment of the present invention is the one in which each woven or knitted fabric part is sewn with a sewing thread containing a conductive fiber, a content of the conductive fiber in the sewing thread is 30 mass %-100 mass %, a content of the conductive fiber in each woven or knitted fabric part is 1 mass % or less, and a frictional charge amount is 0.8 μC/garment or less.
  • Normally, a garment is formed by joining a front body, a back body, sleeves and a collar with a sewing thread.
  • In the present invention, woven or knitted fabric parts mean parts composing a garment; for example, a front body, a back body, sleeves and a collar.
  • A sewing thread is often referred to as “a linking thread” and sewing is often referred to as “linking”. The present invention also includes these meaning of terms.
  • Regarding parts to be sewn, a part where a front body and a back body are sewn means a “side part” and a “shoulder part”, a part where the bodies and a sleeve are sewn means an “armhole part”, a part where the bodies and a collar are sewn means a “collar part”, a part where a sleeve is sewn to be a tubular shape means a “sleeve part”, a part where a tip end of the sleeve is folded and sewn means a “cuff part”, and a lower end of bodies means a “hem part”.
  • In a case that a content of the conductive fiber with respect to a sewing thread is 30 mass % or more, corona discharge from the conductive fiber is sufficiently performed in wearing. Therefore, static electricity is hard to accumulate in the garment, and an uncomfortable feeling due to an electric discharge in undressing can be decreased. In this regard, a content of the conductive fiber with respect to the sewing thread is preferably 50 mass % or more, more preferably 80 mass % or more, and most preferably 100 mass %. Since the electricity in a sheath-core type conductive fiber is eliminated by corona discharge, increasing a fiber cross-section leads to a capability improvement. Therefore, an increase of a mixture rate of the conductive fiber in a spun yarn has an influence on the effectiveness.
  • Further, in a case that a content of the conductive fiber with respect to each woven or knitted fabric part is 1 mass % or less, it is preferable since a color of the conductive fiber does not have an influence on a garment. More preferably, a content of the conductive fiber in each woven or knitted fabric part is 0 mass %, i.e. the conductive fiber is not contained.
  • In a case that a frictional charge amount in the garment is 0.8 μC/garment or less, an uncomfortable feeling due to static electricity emerged when undressing the garment can be decreased.
  • From the above standpoint, the frictional charge amount is more preferably 0.7 μC/garment or less, and further more preferably 0.6 μC/garment or less.
  • 0.6 μC/garment or less of a frictional charge amount is a standard for an antistatic workwear prescribed in JIS T8118 (year 2001).
  • The conductive fiber used in the sewing thread is not limited in particular, as far as a frictional charge amount of a garment becomes 0.8 μC/garment or less.
  • Examples of the conductive fiber are; chemical fibers containing conductive materials in the fiber, a fiber in which a surface is coated with conductive materials, and metallic fibers.
  • Among them, chemical fibers with good dyeing affinity and durability, and containing the conductive material in the fiber are preferable. Further, conductive fibers in which a conductive material is contained in an acrylic fiber able to be dyed with cationic dye, which has a good chromogenic nature, are more preferable.
  • In the sewing thread of the garment in the present invention, it is preferable that an electric resistance value of the contained conductive fiber is 1×104Ω-5×108Ω, and 30 mass %-100 mass % of the conductive fiber is contained.
  • In a case that an electric resistance value of the conductive fiber of 1×104Ω or more, it is preferable since conductivity is high and a mixture rate in the spun yarn can be lowered, and in a case that an electric resistance value of the conductive fiber is 5×108Ω or less, it is preferable in light of cost.
  • From the above standpoint, an electric resistance value of the conductive fiber is more preferably 1×105Ω-5×107Ω.
  • A preferable content of the sewing thread in a garment is 2 mass %-8 mass %, though it changes according to a structure such as a size of a product, and presence or absence of sleeves.
  • In a case that a content of the sewing thread containing the conductive fiber in the garment is 2 mass % or more, it is preferable in light of a high electric discharge effect of static electricity and in light of decreasing an uncomfortable feeling in undressing. In a case that a content of the sewing thread containing the conductive fiber in the garment is 8 mass % or less, it is preferable in light of effectiveness for cost reduction of sewing products in total. From the above standpoint, a content of the sewing thread containing the conductive fiber in a garment is more preferably 3 mass %-6 mass %.
  • In the garment of the present invention, it is preferable that a content of the conductive fiber with respect to a total mass of the garment is 2 mass %-8 mass %.
  • In a case that a content of the conductive fiber with respect to the total mass of the garment is 2 mass % or more, it is preferable in light of decreasing an uncomfortable feeling in undressing since the electric discharge effect of static electricity is high. In a case that a content of the conductive fiber with respect to a total mass of the garment is 8 mass % or less, it is preferable in light of effects of cost reduction of sewing product in total. From the above standpoint, a content of the conductive fiber with respect to a total mass of the garment is more preferably 3 mass %-6 mass %.
  • It is preferable that the sewing thread is used in at least one part among a shoulder part, a side part, an armhole part, a sleeve part, a collar part, and a hem part.
  • The sewing thread is not limited to the one used for sewing the garment and included in the garment, and the sewing thread may be sewn to the garment apart from the sewing thread for sewing the garment.
  • Among them, the sewing thread is preferably used in at least a sleeve part, a side part, a shoulder part and an armhole part, more preferably used also in a collar part or a cuff part, and further more preferably used in all the sewn parts.
  • The sewing thread is often used at a side part, a shoulder part, a sleeve part and a collar part, and it is effective to be used where a movable region is large, such as a side part, a shoulder part and a sleeve part.
  • In the garment of the present invention, it is preferable that the sewing thread to be used is a spun yarn.
  • The sewing thread is composed of a spun yarn, thereby the conductive fiber can be distributed not only on a surface of the thread but also in a whole thread, and a content of the conductive fiber with respect to the sewing thread can be changed depending on its frictional charge amount. Further, since a short fiber is used, the number of end parts in the conductive fiber increases, and corona discharge can be effectively performed.
  • It is preferable that a single fiber fineness of the conductive fiber is 1 dtex-15 dtex.
  • In a case that a single fiber fineness of the conductive fiber is 1 dtex or more, a spun yarn count can be increased. In a case that a single fiber fineness of the conductive fiber is 15 dtex or less, it is preferable since the strength of the spun yarn manufactured can be improved. From the above standpoint, a single fiber fineness of the conductive fiber is more preferably 3 dtex-11 dtex.
  • It is preferable that a fiber length of a single fiber of the conductive fiber is 30 mm-200 mm.
  • In a case that a fiber length of a single fiber of the conductive fiber is 30 mm or longer, mixing with cotton or other chemical synthetic fibers can be easy. In a case that a fiber length of a single fiber of the conductive fiber is 200 mm or shorter, mixing with wool becomes possible, and a spun yarn can be manufactured by using various spinning methods such as cotton spinning or worsted spinning. In light of ease of spinning processing, it is more preferable that a single fiber fineness is 3 dtex-11 dtex and a fiber length of a single fiber is 35 mm-120 mm.
  • In the spun yarn, it is preferable that a yarn count of a single spun yarn is a metric count (NM) of 20-110. A single spun yarn for a sewing thread is manufactured within a range of a metric count of 20-110. In a case of a sweater, it is preferable that a processed yarn obtained by the two-folded yarn processing after manufacturing a single spun yarn of a metric count of 20-40 is used. In a case of a fleece, it is preferable that a processed yarn obtained by the three-folded yarn (three-twisted yarn) processing after manufacturing a single spun yarn of a metric count of 90-105 is used. As a mixing counterpart in a case of a fleece, it is preferable that a polyester short fiber is used in light of the thread strength of the spun yarn.
  • Further, in a single spun yarn, it is preferable that the number of fuzz having a length of 1 mm or longer is 130/m or more, since corona discharge from a fiber cross section, which is a characteristic of the conductive fiber, can be sufficiently performed.
  • It is preferable that an upper limit of the number is 300/m or less in light of passability in processing steps.
  • In the garment of the present invention, it is preferable that the number of fuzz with a length of 3 mm or longer in a single spun yarn is 10/m or more and the number of fuzz with a length of 5 mm or longer is 1/m or more.
  • Within the above range, corona discharge from the fiber cross section, which is a characteristic of the conductive fiber, can be sufficiently performed, and it is preferable.
  • In light of the passability in processing steps, it is preferable that the upper limit of the number of fuzz with a length of 3 mm or longer is 100/m or less and an upper limit of the number of fuzz with a length of 5 mm or longer is 10/m or less.
  • The number of fuzz can be increased by decreasing the number of twisting of a single spun yarn. It should be noted that, since the strength of the thread decreases as the number of twisting decreases, the number of twisting may be set appropriately to balance the both.
  • In the garment of the present invention, it is preferable that the conductive fiber is a fiber containing 5 mass %-9 mass % of carbon black, or 10 mass %-14 mass % of conductive titanium oxide.
  • The carbon black is preferable since conductive capability of the fiber can be easily increased. A fiber of conductive titanium oxide has lower conductive capability than the one of carbon black, while it is inconspicuous when it is included in a garment due to its gray color.
  • It is preferable that the conductive fiber is a sheath-core type acrylic fiber which contains a conductive material in the core part in light of conductive capability, color, prevention of dropping of the conductive material in processing, and possibility of maintaining and enhancing conductivity even though washing is repeated.
  • (Spun Yarn)
  • The spun yarn used in the present invention can be obtained by a general cotton spinning method or a worsted spinning method. Regarding the fiber forming a spun yarn, 30-100 mass % of the conductive fiber, or the sheath-core type acrylic fiber is preferably contained with respect to the spun yarn and in addition, other fibers are mixed and spun. In this case, as a counterpart for mixing, an acrylic fiber or a polyester fiber is preferable to maintain the strength of the thread of the spun yarn. In a case of manufacturing a thread having a metric count of 90 or larger, a polyester fiber is more preferable as a counterpart for mixing.
  • (Sheath-Core Type Acrylic Fiber)
  • Preferred Examples in a manufacturing method of the conductive acrylic fiber of the present invention are explained in detail as follows.
  • In the manufacturing method of the conductive acrylic fiber according to the present Embodiment, firstly, an undiluted spinning solution for a sheath component and an undiluted spinning solution for a core component are prepared. As an undiluted spinning solution of the sheath component, an organic solvent solution obtained by solving acrylic polymer in an organic solvent is prepared. As an undiluted spinning solution of the core component, an organic solvent solution obtained by mixing conductive particles (A) and acrylic polymer (B) so as mass ratio (A)/(B) to be from 4 to 20 and solving the mixture in an organic solvent is prepared.
  • In the present Example, the acrylic polymers used for the undiluted spinning solutions for the sheath component and the core component are not limited in particular, and general acrylic polymers used in manufacturing conventional acrylic fibers can be used. In particular, for example, it is preferable to use the acrylic polymer which can exhibit heat shrinkability easily in the heat shrink processing step after spinning as explained later. Regarding heat shrinkability by composition and relaxation of the acrylic polymer, though depending on the monomer component to be copolymerized, generally, the less acrylonitrile content the polymer has, the higher heat shrinkability tends to be. Accordingly, it is desirable that a content of acrylonitrile in the undiluted spinning solution is appropriately adjusted so that a predetermined heat shrinkability can be obtained in the heat shrinking processing step thereafter.
  • Particularly, regarding the undiluted spinning solution for the sheath component, it is appropriate that a content of acrylonitrile in acrylic polymer is from 50 mass % to 98 mass %, particularly from 50 mass % to 95 mass %. In a case that a content of acrylonitrile is less than 50 mass %, original characteristics of acrylic fiber such as dyeing clearness and chromogenic nature can not be effectively exhibited, and other physical properties including thermal characteristics tend to be deteriorated. Further, to improve solubility and dyeability of acrylonitrile, it is preferable that acrylonitrile is copolymerized with unsaturated monomers such as acrylic acid ester.
  • Accordingly, it is preferable that a content of acrylonitrile in the sheath part is from 50 mass % to 98 mass % as described above by copolymerizing with unsaturated monomer. Thereby, the acrylic fiber can have excellent dyeing clearness, chromogenic nature and thermal properties without losing the characteristics which the acrylic fiber originally has. It should be noted that, in the present Example, unsaturated monomers with which acrylonitrile is copolymerized is not limited in particular. However, for example, acrylic acid and acrylic acid esters, methacrylic acid and methacrylic acid esters, vinyl acetate, vinyl chloride, vinylidene chloride and the like can be used.
  • In this case, for manufacturing the acrylic fiber having a sheath-core structure stably without thread breakage in spinning while suppressing an exposure of the core part to the sheath part it is extremely important to adjust viscosity of the undiluted spinning solution of the sheath component. It is important that solid concentration and temperature in the undiluted spinning solution of the sheath component is controlled so as viscosity of the undiluted spinning solution of the sheath component to be 300 poise or less, preferably 150 poise or less.
  • On the other hand, regarding the undiluted spinning solution of the core component, the conductive particles (A) and the acrylic polymer (B) are mixed so as mass ratio (A)/(B) to be from 4 to 20 and solved in an organic solvent as described above. By setting the value of the above mass ratio to be 4 or more, continuous phase of the conductive particles is stably formed in the acrylic fiber when manufacturing the conductive acrylic fiber, and the acrylic fiber can have sufficient conductive capability. In a case that the above mass ratio (A)/(B) exceeds 20, dispersibility of the conductive particles or spinnability of the undiluted spinning solution are deteriorated in spinning, and breakage of the core part is likely to occur when picking up or drawing the coagulated yarn. Therefore, spinnability as well as conductivity of the acrylic fiber deteriorate.
  • At this time, it is preferable that the conductive particle contained in the undiluted spinning solution of the core component is metallic oxide whose conductivity in a powder form is 10−3 S/cm or more and has high whiteness. As such conductive particles, titanium oxide or zinc oxide can be preferably used, and in addition, for example, tin oxide, indium oxide, or titanium oxide in which a surface is covered with tin oxide or zinc oxide can also be used. Further, in order to enhance conductivity, antimony oxide can be used together with tin oxide and indium oxide, and tin oxide, indium oxide, aluminum oxide, potassium oxide, germanium oxide and the like can be used together with zinc oxide. In this case, a form of the conductive particles contained in the undiluted spinning solution is not limited in particular. However, it is preferable that, in a case that the particle is granular, mean particle size is 3 μm or smaller in light of stability in a filtration step of the undiluted solution and a spinning step in manufacturing the acrylic fiber.
  • As for the organic solvent to adjust each undiluted spinning solution of the above sheath component and the core component, organic solvent such as dimethylacetamide, dimethylformamide, dimethyl sulfoxide and the like is preferably used. However, it is not limited in particular, and other organic solvents used generally in spinning the acrylic fiber may be selected.
  • In the present Embodiment, solid concentration and temperature of each undiluted spinning solution of the above sheath component and the core component are not limited in particular, too. However, when solid concentration is too low, void is likely to occur in fiber after spinning, and as a result, it may lead to deterioration of fiber physical properties or deterioration of conductive capability. Accordingly, it is preferable that solid concentration in the undiluted spinning solution of the sheath component is 5 mass % or higher, and solid concentration in the undiluted spinning solution of the core component is 30 mass % or higher.
  • Next, spinning is conducted according to a wet spinning method with a sheath-core type spinning nozzle using the undiluted spinning solutions of the sheath component and of the core component prepared as above, setting a proportion between the sheath part and the core part so as a content of the conductive particles contained in the acrylic fiber to be from 5 mass % to 15 mass %. In spinning, in a case that a content of the conductive particles contained in the fiber is less than 5 mass %, targeted excellent conductive capability can not be added to the acrylic fiber since the conductive particles are a few. On the other hand, in a case that a content of the conductive particles is beyond 15 mass %, there occurs a problem that the usage of a product is limited since the fiber whiteness is inferior when manufacturing the conductive acrylic fiber.
  • It should be noted that, the wet spinning method can be conducted in the same manner as the method used generally in manufacturing the conventional acrylic fiber. For example, spinning can be conducted by extruding the undiluted spinning solution of the sheath component and the core component from the sheath-core type spinning nozzle into the coagulated liquid composed of the organic solvent and water, and solidifying.
  • At this time, as the sheath-core type spinning nozzle, it is preferable that a spinning nozzle having 3000 holes or more, particularly 5000 holes or more is used. The spinning is conducted by using such a sheath-core type spinning nozzle having 3000 holes or more, thereby the conductive acrylic fiber can be manufactured with extremely high productivity.
  • Thereafter, for the coagulated yarn obtained by the above wet spinning, each processing such as drawing, applying desolventizing agent and oil agent, drying and densification and the like is applied, then heat shrink processing is conducted in which the coagulated yarn is shrunk at shrink rate from 30% to 50%. The processing method and the processing condition in each processing of drawing, applying the desolventizing agent and oil agent, drying and densification and the like is not limited in particular and can be changed appropriately if necessary. For example, drawing processing can be conducted in hot water at 80° C. or higher using desolventizing agent. Further, in light of spinning stability and physical properties of the obtained fiber and the like, a draw ratio is preferably set to be 3-10 times and more preferably 4-7 times.
    • EXAMPLE
  • Hereinafter, the present invention is specifically explained referring to Examples. It should be noted that, evaluation items in Examples are measured by the following methods.
  • (Measuring Method for the Electric Resistance Value of a Single Fiber)
  • The conductive acrylic fibers were bonded to metal monads while distancing at precisely 1 cm intervals with silver paste (“DOTITE” manufactured by Fujikura Kasei Co., Ltd.). DC voltage of 1000 V is applied between the metal monads under the atmosphere of temperature of 20° C. and relative moisture of 40 RH %. Then the resistance value between the metal monads was measured (“SM-8210” manufactured by former Toa Dempa Co., LTd.).
  • (Measuring Method for Frictional Charge Amount)
  • A product used in measurement was washed five times repeatedly by JIS L217 106 method, rinsed with injected water for 20 minutes, then tumble dried.
  • A frictional charge amount of the washed product was measured based on JIS T8118 method.
  • (Measuring Method for the Number of Fuzz)
  • The fuzz in the spun yarn was measured based on JIS L1095 9.22.2 B method.
    • Example 1
  • A spun yarn was manufactured by putting 100 mass % of conductive sheath-core type acrylic fiber (ET10 manufactured by Mitsubishi Rayon Co. Ltd., fineness: 3.3 dtex, fiber length: 38 mm) into a machine for a cotton spinning step. The conductive sheath-core type acrylic fiber contains conductive titanium oxide in the core part, and a content of conductive titanium oxide with respect to a total fiber is 12 mass %. At this time, since a single fiber strength is weak, the single fiber breakage occurs according to a draw ratio and the spinning rate in each step, which leads to the possibility of fray occurrence. Therefore, the spinning rate of a carding machine is set to be 40 m/minute or lower and a draw ratio of a draw frame is set to be 8 times. Spinning of the single spun yarn was conducted with a metric count of 32 and the number of twisting of 630 times/m in a spinning frame. As a sensor for measuring yarn evenness used in rolling the single spun yarn, not a normal capacitance method but an optical method was adopted. After the single spun yarn was manufactured, a doubling step was conducted, and S-twisting was conducted for 400 times/m as the final twist with a twisting machine to make it two-folded yarn. Thus the sewing thread A was manufactured.
  • Separately, a knitted fabric of rib knitting structure with 12G was manufactured by using two-folded yarn with a yarn count of 2/32 by metric count made of 100% of wool.
  • Then, a round neck sweater was manufactured by using the sewing thread A and the knitted fabric. The sewn parts at which the sewing thread A was used were a sleeve part, a side part, a shoulder part, an armhole part and a collar part.
  • The sweater was dyed after sewn with black color and a black sweater was obtained. Then, a frictional charge amount of the black sweater was measured. The composition of the garment is shown in Table 1 and the evaluation result is shown in Table 2.
    • Example 2
  • A pink V neck sweater was obtained in the same manner as Example 1 except that a V-neck sweater was manufactured, and the dyeing after sewn was performed with a pale color, i.e. pink.
  • A frictional charge amount of the pink sweater was measured. The composition of the garment is shown in Table 1 and the evaluation result is shown in Table 2.
    • Example 3
  • A sweater was obtained in the same manner as Example 1 except that the sewing thread A was used for sewing a sleeve part, a side part, a shoulder part and an armhole part, and as for sewing a collar part, a sewing thread not containing the conductive fiber was used instead of the sewing thread A, as shown in Table 1. The evaluation result is shown in Table 2.
    • Example 4
  • As shown in Table 1, a sweater was obtained in the same manner as Example 1 except that the sewing thread A was used for sewing a sleeve part, a side part, a shoulder part, an armhole part and a cuff part. The evaluation result is shown in Table 2.
    • Example 5
  • As shown in Table 1, a sweater was obtained in the same manner as Example 1 except that the sewing thread A was used for sewing a sleeve part, a side part, a shoulder part, an armhole part and a cuff part, a name tag with a size of 1 cm by 5 cm was sewn to an upper part of the back body with the sewing thread A, and dyeing after sewn was conducted with navy blue color. The evaluation result was shown in Table 2.
    • Example 6
  • A spun yarn B was manufactured in the same manner as Example 1 except that a content of conductive titanium oxide with respect to the total fiber was 20 mass %.
  • Then, a round neck sweater was manufactured in the same manner as Example 1 except that the spun yarn B was used in a sleeve part, a side part, a shoulder part and an armhole part. The composition of the garment is shown in Table 1 and the evaluation result is shown in Table 2.
    • Comparative Example 1
  • A black sweater was obtained in the same manner as Example 1 except that instead of the conductive fiber in Example 1, non-conductive acrylic fiber (V 17, manufactured by Mitsubishi Rayon Co., Ltd., single fiber fineness: 3.3 dtex, fiber length: 38 mm) was used.
  • Then, a frictional charge amount of the black sweater was measured. The composition of the garment is shown in Table 1 and the evaluation result is shown in Table 2.
  • TABLE 1
    Conductive fiber Sweater
    Electric Single Sewing thread Content of
    resistance fiber Fiber Mixture counductive
    value fineness length rate Count Parts at which sewing thread fiber
    Ω dtex mm Fiber used mass % NM A or B is used mass %
    Example 1 5 × 105 3.3 38 Conductive fiber 100 2/32 Sleeve portion, Side portion, 3.6
    Shoulder portion, Armhole
    portion, Collar portion
    Example 2 5 × 105 3.3 38 Conductive fiber 100 2/32 Sleeve portion, Side portion, 4.0
    Shoulder portion, Armhole
    portion, Collar portion
    Example 3 5 × 105 3.3 38 Conductive fiber 100 2/32 Sleeve portion, Side portion, 4.0
    Shoulder portion, Armhole
    portion
    Example 4 5 × 105 3.3 38 Conductive fiber 100 2/32 Sleeve portion, Side portion, 4.5
    Shoulder portion, Armhole
    portion, Cuff portion
    Example 5 5 × 105 3.3 38 Conductive fiber 100 2/32 Sleeve portion, Side portion, 4.5
    Shoulder portion, Armhole
    portion, Cuff portion, Name tag
    Example 6 1.8 × 104   3.3 38 Conductive fiber 100 2/32 Sleeve portion, Side portion, 3.4
    Shoulder portion, Armhole
    portion
    Comparative Acrylic fiber not containing Acrylic fiber 100 2/32 — 0
    Example 1 conductive fiber
  • TABLE 2
    Frictional charge amount
    Friction cloth Friction cloth Number of fuzz
    (acryl) (nylon) 1 mm or longer 3 mm or longer 5 mm or longer
    μC/garment μC/garment number/m number/m number/m
    Example 1 0.39 0.39 183 15 2
    Example 2 0.56 0.53 167 13 2
    Example 3 0.5 0.73 170 15 2
    Example 4 0.42 0.74 180 14 2
    Example 5 0.53 0.39 165 15 2
    Example 6 0.21 0.27 175 15 3
    Comparative 1.40 0.89 120 10 1
    Example 1

Claims (15)

1. A garment in which each woven or knitted fabric part is sewn with a sewing thread containing a conductive fiber, wherein
a content of the conductive fiber in the sewing thread is 30 mass %-100 mass %,
a content of the conductive fiber in each woven or knitted fabric part is 1 mass % or less, and
a frictional charge amount is 0.8 μC/garment or less.
2. The garment according to claim 1, wherein an electric resistance value is 1×104Ω-5×108Ω per 1 cm length of the conductive fiber in a fiber axis direction.
3. The garment according to claim 1, wherein a content of the sewing thread with respect to a total mass of the garment is 2 mass %-8 mass %.
4. The garment according to claim 1, wherein a content of the conductive fiber with respect to a total mass of the garment is 2 mass %-8 mass %.
5. The garment according to claim 1, wherein the sewing thread is used in at least one part among a shoulder part, a sleeve part, a collar part, a side part, an armhole part, a hem part and a cuff part.
6. The garment according to claim 1, wherein the sewing thread is a spun yarn.
7. The garment according to claim 1, wherein a single fiber fineness of the conductive fiber is 1 dtex-15 dtex.
8. The garment according to claim 6, wherein a fiber length of a single fiber of the conductive fiber contained in the spun yarn is 30 mm-200 mm.
9. The garment according to claim 6, wherein a yarn count of a single spun yarn has a metric count of 20-110, the number of fuzz which is 1 mm or longer in a single spun yarn is 130/m or more.
10. The garment according to claim 9, wherein the number of fuzz which is 3 mm or longer is 10/m or more, and the number of fuzz which is 5 mm or longer is 1/m or more in the single spun yarn.
11. The garment according to claim 6, wherein the spun yarn is two-folded yarn or three-folded yarn.
12. The garment according to claim 1, wherein the conductive fiber contains 5 mass %-9 mass % of carbon black or 10 mass %-25 mass % of conductive titanium oxide.
13. The garment according to claim 1, wherein the conductive fiber is a sheath-core type acrylic fiber containing a conductive material in a core part.
14. The garment according to claim 1, wherein the garment is a sweater or a fleece.
15. A sewing thread containing 30 mass %-100 mass % of the conductive fiber.
US15/951,390 2015-10-20 2018-04-12 Garment having antistatic capability Abandoned US20180228225A1 (en)

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JPWO2017069100A1 (en) 2017-10-19
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EP3366151A4 (en) 2019-05-01
JP6332471B2 (en) 2018-05-30

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