Classifications

• • 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
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/18—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by combining fibres, filaments, or yarns, having different shrinkage characteristics
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S57/00—Textiles: spinning, twisting, and twining
  • Y10S57/905—Bicomponent material

Definitions

• a composite fiber composed of two or more polymers which would exhibit different thermal behaviors and arranged eccentrically along the entire length of the fiber would give rise to three-dimensional or coily crimps upon heating due to the differential thermal shrinkage of said component polymers.
• the yarns made by mix-spinning such as acrylic composite fiber with another fiber, or knit or woven fabrics of such yarn may be expected to have an improved bulk and hand as compared with the comparable products manufactured by using the conventional acrylic fiber.
• This invention provides a method of manufacturing products having a satisfactory bulk, which comprises mixspinning (blending) an acrylic composite fiber having latent coil crimps, i.e. crimps that could be developed upon heating, with a thermally shrinkable acrylic fiber having a high shrinking characteristic so that the spun yarn may have an additional shrinking capacity which is sufiicient to cope with the above-mentioned restrictive forces and, accordingly, the latent coil crimps may be brought into complete development.
• the thermally shrinkable acrylic fiber to be mix-spun or blended with an acrylic composite fiber should have a shrinkage of at least 5% and a shrinking power of at least 30 mg./d. in hot water at 98 C.
• X represents the shrinking power in mg./d. of said thermally shrinkable acrylic fiber in hot water at 98 C. and Y represents the relative amount of the thermally shrinkable acrylic fiber in the blend spun yarn composed of the acrylic composite fibers having latent coil crimps and the thermally shrinkable fiber.
• the above-mentioned shrinking power and shrinkage are determined as follows.
• SHRINKAGE A similar sample is treated with hot water at 98 C. for 10 minutes while it is held in a relaxed state. Theshrunk length is measured under the tension of 10 mg./d.
• any composite acrylic fiber which can develop coil crimps when heat treated may be used.
• the composite fiber may be composed of polyacrylonitrile and an acrylonitrile copolymer, or may be composed of an acrylonitrile copolymer and another acrylonitrile copolymer.
• the different polymers composing the composite fiber must be different in thermal shrinkage, due to which the said fiber develops coil crimps upon being heated.
• the copolymer comprises at least 50% by weight of acrylonitrile.
• the production of such composite acrylic fiber is well known in the art and does not constitute the feature of the invention.
• the resulting fiber was dried in a highly humid atmosphere at a dry-bulb temperature of 105 C. and a wet bulb temperature of 70 C. until it had a water content of less than 3%.
• the fiber was further treated in boiling water for minutes, during which time it was held in a relaxed state.
• the fiber was then mechanically crimped, oiled and dried to prepare a 6-denier composite fiber (this fiber will be referred to as (A) hereinafter).
• another spinning solution (polymer concentration 10%) was prepared by dissolving a copolymer of 90% acrylonitrile and 10% methyl acrylate in a 50% aqueous solution of sodium thiocyanate.
• This spinning solution was extruded and formed into filaments in a conventional manner, and the resulting filaments were washed with water and, then, stretched in boiling water to 8 times its initial length.
• the spinnerette nozzle used had 500 orifiices (each 0.08 mm. in diameter).
• the fiber was dried in a highly humid atmosphere at a drybulb temperature of 105 C. and a wet-bulb temperature of 70 C. until it had a water content of less than 3%. The fiber was then treated in saturated water vapor at 120 C.
• the fibers were mechanically crimped to prepare shrinkable filaments (B), (C) and (D).
• the shrinkage values of the above filaments in hot water at 98 C. were 7%, 13% and 18%, respectively, while their shrinking power values were found to be 32 mg./d., 49 mg./d. and 74 mg./d., respectively.
• the four kinds of filaments prepared above were cut into staples and spun yarns (4/22) were manufactured by mix-spinning (A) with (B), (C) and (D) in various combinations and ratios.
• the hanks of these spun yarns were dyed by means of a hank dyeing machine. The dyeing operation was carried out under the following conditions.
• the yarns were thermally shrunken simultaneously with dyeing, but a satisfactory bulk may likewise be produced by treating them under dry hot or wet hot conditions, independently of the dyeing operation.
• a method of manufacturing bulky yarn or fabric containing acrylic composite fibers and thermally shrinkable acrylic fiber characterized by blending an acrylic composite fiber having latent coil crimps that would be developed upon heating and which are produced by composite spinning two or more dissimilar acrylic polymers different in thermal shrinkage value, with a thermally shrinkable acrylic fiber having a shrinkage value of at least 5 percent and a shrinking power of at least 30 mg./d. as measured in hot water at 98 C. in such a proportion as would satisfy the following formulas:
• X is the shrinking power in mg./d. of said thermally shrinkable acrylic fiber as measured in hot water at 98 C. and Y is the relative amount by weight of said thermally shrinkable fiber in the said blended yarn, and heating the resulting spun yarn or fabric made thereof at temperatures over C. to produce a bulk therein.
• a blended yarn composed of acrylic composite fibers of two or more dissimilar acrylic polymers different in thermal shrinkage and thermally shrinkable acrylic fibers having a shrinkage value of at least 5 percent and a shrinking power of at least 30 mg./d. as measured in 98 C. hot water in such a proportion as would satisfy the following formulas:
• X is the shrinking power in mg./d. of said thermally shrinkable fiber as measured in hot water at 98 C. and Y is the relative amount of said thermally shrinkable fiber in the blend spun yarn composed of said composite fibers and thermally shrinkable acrylic fibers.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Multicomponent Fibers (AREA)
• Artificial Filaments (AREA)
• Knitting Of Fabric (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=12991996

Family Applications (1)

Country Status (8)

Cited By (4)

Citations (13)

• 1963
  • 1963-10-14 JP JP38055199A patent/JPS4825029B1/ja active Pending
• 1964
  • 1964-10-07 BE BE654087D patent/BE654087A/fr unknown
  • 1964-10-09 US US402931A patent/US3434276A/en not_active Expired - Lifetime
  • 1964-10-12 NL NL646411842A patent/NL144677B/xx not_active IP Right Cessation
  • 1964-10-13 DE DE19641435511 patent/DE1435511A1/de active Pending
  • 1964-10-13 LU LU47141A patent/LU47141A1/xx unknown
  • 1964-10-14 ES ES0304913A patent/ES304913A1/es not_active Expired
  • 1964-10-14 GB GB42004/64A patent/GB1028435A/en not_active Expired

Patent Citations (13)

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