Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
  • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
  • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
  • D01D5/30—Conjugate filaments; Spinnerette packs therefor
• • 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
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2922—Nonlinear [e.g., crimped, coiled, etc.]
  • Y10T428/2924—Composite

Definitions

• a multifilament yarn comprising a plurality of filaments composed of two kinds of thermoplastic high polymers having different viscosities and arranged in an eccentric disposition in the cross section of each filament.
• Material high-polymers should preferably be chosen from polyester groups and the difference in viscosities thereof should be larger than 0.05.
• a fabric containing the yarns can be provided with enhanced bulkiness together with unique handling quality.
• the present invention relates to an improved multi filament yarn, more particularly relates to an improved polyester multifilament yarn preferably used as filling yarns of a fabric so as to provide the fabric with enhanced bulkiness together with unique handling quality.
• composite filament yarns thus obtained are preferably used in manufacturing various textile prodnets on account of their unique characteristic features. Some of the examples of such utilization of the conventional composite filament yarns are found in the field of bulky knitted fabrics or crepe fabrics.
• a fabric of a remarkably unique handling quality hereinafter used refers to a fabric having improved bulkiness, moderate extensibility and enhanced flexibility when compared with the conventional fabrics made of synthetic filament yarns.
• the conventional fabrics of this type have been obtained by utilizing bulky textured yarns mainly manufactured by the false-twisting method as the material weaving yarns, and for this reason, such fabrics have generally been called textured fabrics.
• cross sections of the individual filaments deviate substantially from the circular to polygonal ones.
• the light reflection effect of the yarn bundle of filaments having such deformed cross sections is lowered and this results in lowered luminous effect of the fabric manufactured from such filament yarns.
• the false-twisting method usually employs a heat-setting operation using a heated plate or a heated cylinder.
• a heat-setting operation using a heated plate or a heated cylinder.
• lack of uniformity in the effect of the heat-setting operation tends directly to cause irregular affinity of the filaments obtained to dyestuffs. So, there is a great danger of uneven dyeing of the fabric manufactured of such conventional textured filament yarns.
• a principal object of the present invention is to provide an improved polyester multifilament yarn which can favourably be used for manufacturing high quality fabrics provided with appearance and handling quality resembling those of the conventional textured fabrics while eliminating drawbacks which are present in the conventional textured fabrics.
• Another object of the present invention is to provide an improved polyester multifilament yarn which can be processed through weaving or knitting operation without causing troubles which are often observed in case the conventional textured filament yarns are processed.
• a further object of the present invention is to provide an improved polyester multifilament yarn having uniform affinity to dyestuffs and assuring even dye effect upon the fabric containing the same.
• a composite filament is provided with coiled crimps.
• the number of the clockwisely spiralling coils and that of the counterclockwisely spiralling coils are approximately equal along the longitudinal direction of a composite filament. So, the residual torques developed on the composite yarn will cancel each other,
• the polyester multifilament yarn of the present invention is characterized by a composite filament wh ch is substantially composed of two or more polyester polymers having different thermal shrinking properties arranged in an eccentric disposition in the cross section of the filament, the percent apparent shrinkage of the filament yarn in boiling water ranges between 30 and 65%, percent true shrinkage of the filament yarn by dry heating is smaller than 10.0%, the value of the contraction stress measured at 180 C. is smaller than 120 rug/denier and the number of crimps developed upon the filament by treatment with boiling water is larger than 16 crimps/ cm.
• the fabric containing the same can not be provided with the advantages of the present invention. Paper-like handling of the fabric, development of pebbles upon the fabric, excessive contraction of the width of the fabric during finishing or dyeing operation of the fabric and rough handling of the product obtained will be observed.
• the material polyester polymers should be done in such a manner that the intrinsic viscosities of the polymers should be different from each other.
• One of the component polymers should preferably have an intrinsic viscosity ranging from 0.45 to 0.55 and the other component polymer should preferably have an intrinsic viscosity ranging from 0.60 to 0.85.
• Both of the component polymers should be meltspun at a spinning temperature ranging between 290 and 300 C. in such a manner that these component polymers are arranged in an eccentric disposition, or more preferably in a bimetal-like disposition, in the cross section of a filament.
• the bundle of filaments is subjected to coagulation by a cooled air flow and taken up onto a package at a winding-up tension larger than 0.15 g./denier.
• the multifilament yarn thus obtained is subjected to a drawing operation in a drawing machine provided with a heated pin and a heated plate. Drawing is carried out at a drawing ratio ranging between 3.0 and 3.8.
• the temperature of the heated plate should be maintained between room temperature and 180 C. and the temperature of the heated pin should be in a range between the glassy transition point temperature and 160 C.
• a relaxation thermal treatment should be applied upon the drawn multifilament yarn in an equipment provided with heated cylinder through which the multifilament yarn is passed.
• the temperature of the heated cylinder should be maintained between 130 and 240 C., more preferably between 200 and 230 C., and the relaxation ratio should range from to 70%, more preferably around 20%. Then the multi- 4 filament yarn thus obtained is provided with numerous fine spirally coiled crimps thereon developed.
• polyester polymers should preferably be chosen in combination from a group composed of terephthalic acid, lower alkyl derivatives of terephthalic acid, ethylene glycol, bis-2-hydroxyl-ethylterephthalate or its low polymers and polyesters containing at least 70% by weight of polyethylene terephthalate.
• the combination of polymers chosen from the abovedescribed polyester group should be determined in such a manner that the difference in the intrinsic viscosities of polymers should be as hereinafter described.
• a combination of terephthalic acid with ethylene glycol is preferably employed.
• the above-described polymers can also contain copolymer components chosen from a group composed of aliphatic di-carboxylic acids such as oxalic acid, adipic acid and azelaic acid; aromatic di-carboxylic acids such as isophthalic acid, phthalic acid, 2,6-naphthalene di-carboxylic acid and diphenic acid; di-carboxylic acid having alicycles such as 1,2-cyclobutane di-carboxylic acid; dicarboxylic acid containing elements other than carbon, hydrogen and oxygen such as compounds having structures shown by the following general formulas COOH COOH COOH for instance S-sodium sulfophthalic acid and 5-rnethylsulfophthalic acid; multifunctional compounds such as trimellitic acid and pyromellitic acid; lower alkyl esters and glycol esters of such multifunctional compounds; polyoxy compounds such as di-ethylene-glycol, propylene glycol, polyethylene glycol, butendiol
• the polymers may contain such pigments as carbon black, phthalocyamine, titanium pigments and silicic anhydride, and phospho-compounds such as phosphoric acid, phosphorous acid, tri-phenyl-phosphate, trimethyl-phosphate and tri-phenyl-phosphate. Furthermore, in case the viscosity of the molten polyester solution is remarkably low, it is also recommended that additives such as boric compounds or aluminate compounds be mixed.
• intrinsic viscosity refers to a viscosity of polyester polymer dissolved with o-chlorophenol solution measured at 25 C.
• the drawing ratio of the filament is given by the ratio of the peripherical speed of the drawing roller with respect to the feed roller and the percent relaxation ratio of the filament is given by wherein:
• V The peripheral speed of the feed roller
• V The peripheral speed of the relaxing roller
• NUMBER OF CRIMPS A crirnped filament of 20 cm. long is loaded with a weight of l mg./denier, and the number of crimps per unit length (1 cm.) observed on the filament is counted along cm. length of the filament.
• EXAMPLE 1 Two material polyethyleneterephthalate polymers having intrinsic viscosities of 0.50 and 0.80, respectively, were prepared. By composite spinning the material polymers at a spinning temperature of 295 C. in the so-called bimetallike configuration, an undrawn multifilament yarn having a total fineness of 500 denier and containing 48 filaments was obtained and taken up onto a package at a winding-up tension of 0.20 g./denier. Next, the undrawn multifilament yarn was subjected to a drawing operation at a drawing ratio of 3.5 by passing through a drawing machine wherein the temperature of the heated pin was maintained at 98 C., the temperature of the heated plate was maintained at 150 C. After the drawing operation, the total fineness of the yarn was 150 denier.
• a multifilament yarn (Sample No. 1) provided with numerous fine crimps was obtained.
• the temperature of the heated cylinder used in the relaxation thermal treatment of pebbles upon the fabric surface was observed, resulting characteristic features of the yarn thus obtained are illustrated in Table 1 with Sample No. 1.
• a tropical fabric was manufactured using the multifilament yarns thus obtained for both the warps and fillings, and the fabric was subjected to the usual finishing process composed of relaxed scouring, squeezing and drying, heat-setting, scouring, dyeing, squeezing and drying and the final setting.
• the resulting characteristic features of the fabric thus obtained are also illustrated in Table 1 wherein it is apparent that no development of pebbles upon the fabric surface was observed, finishing contraction of the width of the fabric was adequate as this was 23% and the fabric was provided with suitable thickness together with good handling quality.
• EXAMPLE 2 Nine types of polyester multifilament yarns of 150 denier (Samples No. 2 to 10) were manufactured using the method and equipment used in the preceding example. However, in the present example, processing conditions were selected as follows.
• Intrinsic viscosity of the low viscosity component polyrner0.450.55.
• Intrinsic viscosity of the high viscosity component polymer 0.600.85.
• Temperature of the heated plate in the drawing proce'ss--Up to 180 C. or none.
• a multifilament yarn of denier was manufactured from polyethyleneterephthalate polymer having an intrinsic viscosity of 0.48 and polyparaoxyethylenebenzoate polymer having an intrinsic viscosity of 0.56.
• This manufacture employed the equipment used in Example 1 and the processing conditions employed in Example 2.
• the multifilament yarn obtained (Sample No. 12) is provided with properties within the range defined by the scope of the present invention as shown in Table l, and the tropical fabric made of the yarn is also provided with excellent properties which can meet the commercial requirements.
• the fabric of Sample No. 11 was accompanied with development of pebbles and rough handling, the properties of which was outside the range defined by the scope of the present invention.

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=13318991

Family Applications (1)

Country Status (3)

Cited By (6)

Families Citing this family (5)

• 1968
  • 1968-10-10 GB GB1228640D patent/GB1228640A/en not_active Expired
  • 1968-10-15 US US767813A patent/US3570235A/en not_active Expired - Lifetime
  • 1968-10-16 DE DE19681803435 patent/DE1803435A1/de active Pending

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