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WO1993010293A1 - Ameliorations relatives a des brins, des fils et des cables de polyester - Google Patents

Ameliorations relatives a des brins, des fils et des cables de polyester Download PDF

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Publication number
WO1993010293A1
WO1993010293A1 PCT/US1991/008381 US9108381W WO9310293A1 WO 1993010293 A1 WO1993010293 A1 WO 1993010293A1 US 9108381 W US9108381 W US 9108381W WO 9310293 A1 WO9310293 A1 WO 9310293A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarn
shrinkage
yarns
drawn
feed
Prior art date
Application number
PCT/US1991/008381
Other languages
English (en)
Inventor
John Paul Hendrix, Jr.
Benjamin Hughes Knox
James Bennett Noe
Original Assignee
E.I. Du Pont De Nemours And Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E.I. Du Pont De Nemours And Company filed Critical E.I. Du Pont De Nemours And Company
Priority to PCT/US1991/008381 priority Critical patent/WO1993010293A1/fr
Publication of WO1993010293A1 publication Critical patent/WO1993010293A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters

Definitions

  • This invention concerns improvements in and relating to polyester (continuous) filaments, especially in the form of textured yarns, and more especially to a capability to provide from the same feed stock such polyester continuous filament yarns of various differing deniers, as desired, and of other useful properties, including improved
  • Preferred undrawn polyester feed yarns comprise spin-oriented polyester filaments of low shrinkage, such as have been disclosed in Knox U.S. Pat. No. 4,156,071.
  • spin-oriented feed yarns of low shrinkage may be prepared at speeds higher than are used in the Knox patent, including speeds and conditions such as are disclosed by
  • the parent application is primarily concerned with the preparation of and improvement of flat yarns and filaments, as indicated.
  • the present invention is concerned primarily with the air-jet texturing of such yarns to provide novel textured yarns.
  • a process for preparing a textured polyester yarn wherein a feed yarn of spin-oriented polyester filaments is completely or partially drawn to a uniform yarn by hot-drawing or by cold-drawing, with or without heat-setting, and then said uniform yarn is air jet textured, said feed yarn being of
  • E3 elongation-to-break
  • T7 tenacity at 7% elongation
  • S ⁇ boil-off shrinkage
  • thermal stability as shown by an S2 value less than +1%
  • maximum shrinkage tension (ST) less than 0.3 grams/denier
  • Partial drawing and/or cold-drawing are expected to be particularly important embodiments. Hot-drawing with or without post heat-treatment may also be very useful combinations, as will become clear.
  • the feed yarn may be heat treated, without drawing, and then air jet textured.
  • the process may be modified to provide a mixed-shrinkage air-jet .textured polyester yarn from such feed*yarns of spin-oriented flat polyester filaments.
  • a feed yarn (A) may be drawn to a uniform drawn yarn of high shrinkage by cold-drawing without any post heat treatment
  • such a feed yarn (B) may be drawn to a uniform drawn yarn of lower shrinkage by hot or by cold-drawing with a post heat treatment to reduce shrinkage, and these uniform drawn yarns may be comingled and air-jet textured.
  • such a feed yarn (B) may be drawn to a uniform drawn yarn of lower shrinkage by cold-drawing without any post heat treatment, wherein said draw ratios for drawing feed yarns (A) and (B) are selected to provide an elongation for the uniform drawn yarn of lower shrinkage from feed yarn (B) at least about 10% greater than the elongation of the uniform drawn yarn of higher shrinkage from feed yarn (A), and then the uniform drawn yarns may be co-mingled and air-j et textured.
  • At least some difference in shrinkage of said mixed-shrinkage air-jet textured yarns is developed while said yarns are in the form of a weftless warp sheet prior to knitting or
  • the process of the invention is particularly useful in giving a capability of providing yarns desirably textured and with filaments of low denier, less than about 1, which are in great demand
  • Polyester polymers used herein, may, if desired, be modified by incorporating ionic dye sites, such as ethylene-5-M-sulfo-isophthalate residues, where M is an alkali metal cation, for example in the range of about 1 to about 3 mole percent ethylene-5-sodium-sulfo-isophthalate
  • ionic dye sites such as ethylene-5-M-sulfo-isophthalate residues, where M is an alkali metal cation, for example in the range of about 1 to about 3 mole percent ethylene-5-sodium-sulfo-isophthalate
  • A. suitable polymer of relative viscosity (LRV) about 13 to about" 18 is particularly useful.
  • Representative copolyesters used herein to enhance dyeability with disperse dyes are described in part by Most U. S. Patent No. 4,444,710, Pacofsky U. S. Patent No. 3,748,844, Hancock U. S. Patent No. 4,639,347, and Frankfort and Knox U. S. Patent Nos. 4,134,882 and 4,195, 051, and representative
  • shrinkage especially of polyesters modified with ionic dye sites and/or copolyesters, are described in part in Knox U. S. Patent No. 4,156,071, Ma ⁇ Lean U.
  • Air-jet texturing is itself a known process, and commercial machines are available for practicing air-jet texturing.
  • Air-jet texturing may be carried out conventionally, using commercial equipment, such for example, as is available from Barmag, an example being referred to hereinafter, in relation to AJT Examples and Tables XVI and XVII (numbered
  • Tables XVI and XVII use feed yarns as disclosed in the Examples of the parent application (in Tables I-XV and the accompanying disclosure of drawing of feed yarns without any air-jet texturing). This is why the Tables herein are numbered XVI and XVII, as
  • AJT is used herein variously to indicate air-jet texturing and air-jet textured, according to context.
  • Table XVI shows the properties resulting from AJT according to the invention of undrawn feed yarns that were similar to feed yarns IC, IV-1, V-3 and VI- 3, but of 91 denier and 100 filaments. All four yarns were processed similarly by cold drawing, then (sequentially) AJT on a Barmag FK6T-80 machine, using a conventional air-jet at 125 psi (8.8 kg/cm 2 ), and heat set at 105°C at speeds of 300 mpm, but the cold draw ratios were varied, as indicated, to provide bulky (looped) textile yarns with filament deniers between about 0.7 and 0.9 before boil-off shrinkage (BBO) and filament deniers between about 0.77 and 0.94 after boil-off shrinkage (ABO).
  • the deniers shown in Table XVI are for drawn yarns. (Denier) D&JT is the denier of the yarn measured after AJT.
  • (Denier) D is an estimated value for the drawn yarn before AJT, calculated from the draw ratio (DR) used and the denier of the undrawn feed yarn, which is referred to hereinafter as (Denier) Flat
  • the denier of AJT yarn XVI-1 (wherein no draw was taken) showed an increase in yarn denier of about 10% due to the formation of filament loops (i.e., the ratio (Denier) DAJT/(Denier) piat was greater than about 1.1); however, as expected, the denier of the actual filaments remained the same.
  • the "Bulk" of an AJT yarn is herein defined by the ratio of yarn deniers; that is, the Bulk is calculated by subtracting the calculated value of the denier of the drawn yarn before AJT (Denier) D from the denier of the yarn measured after AJT
  • AJT yarns XVI-2 and XVI-3 were uniformly partially cold drawn to provide residual elongations greater that 40%, and were capable of being uniformly dyed without along-end dye variations (such as would result from nonuniform thick-thin drawing,
  • BOS and DHS shrinkages were boil-off and dry-heat shrinkages (BOS and DHS) of 12.7 and 11.0%, respectively, with a differential shrinkage (DHS-BOS) less than +2%. With mild heat setting, these BOS and DHS shrinkages can be reduced to less than about 3%.
  • Co-mingling (plying) 2 or more cold drawn AJT textile yarns wherein at least one AJT yarn has been heat set to shrinkages less than about 3%, and a second AJT yarn has not been heat set, so has
  • mixed shrinkage AJT yarns may be provided by co-mingling 2 or more drawn filament bundles wherein both bundles are drawn by cold drawing without post heat treatment, but the bundles are cold drawn to different elongations, preferably differing by about 10% or more (compare EX. XVI-2 to XVI-4, for example) .
  • the resulting mixed shrinkage drawn yarn may then be AJT to provide a mixed shrinkage textured yarn.
  • the higher-shrinkage components of our mixed shrinkage yarns of the invention differ from yarns made by drawing a conventional POY, in that our higher shrinkage yarns have a differential shrinkage (DHS-BOS) typically less than about 2%, this low differential shrinkage for a higher shrinkage
  • the component provides a very stable level of mixed shrinkage over a large end-use processing temperature range.
  • the level of the "feed" yarn interlace is optimized for desired mixed shrinkage and AJT yarn aesthetics.
  • Preferred AJT filament yarns are prepared from undrawn feed yarns that have been treated with caustic in the spin finish (as taught by Grindstaff and Reese, in allowed copending Application Serial No. 07/420,459, filed October 12, 1989) to enhance their hydrophilicity and provide improved moisture-wicking properties, and comfort.
  • Incorporating filaments of different deniers and/or cross-sections may also be used to reduce filament-to-filament packing and thereby improve tactile aesthetics and comfort.
  • Unique dyeability effects may be obtained by co-mingling drawn filaments of differing polymer modifications, such as homopolymer dyeable with disperse dyes and ionic copolymers dyeable with cationic dyes.
  • a mixed shrinkage flat yarn can be formed in a similar manner, wherein the yarns by-pass the air- jet.
  • polyester co polymer of relative viscosity (LRV) about 13 to about 18 and containing about 1 to about 3 mole percent of ethylene-5-sodium-sulfo isophthalate is preferred. Accordingly, undrawn feed yarns that were capable of being partially and cold drawn to provide uniform drawn filament yarns were prepared by spinning 15.3 LRV copolymer at about
  • the undrawn yarns can be drawn up to 1.77X and 1.68X, respectively, to provide drawn filament yarns (of at least about 20% elongation) that may be air-jet textured to provide bulky, soft cationic-dyeable textured yarns.
  • the undrawn yarns may also be drawn with or without heat treatment and combined with homopolymer drawn filament yarns to provide mixed dyeability yarns.

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

Abstract

La texturation par jet d'air, alliée à l'étirage, en particulier l'étirage à froid, ou à chaud, ou par d'autres traitements thermiques, de brins de polyester cristallins orientés au filage, en particulier des fils d'alimentation de polyester, qui ont été produits par filage à des vitesses de 4 km/min, par exemple, et qui présentent un rétrécissement faible et presqu'aucun rapport d'étirage naturel dans le sens classique, constitue une technique utile pour obtenir des brins étirés uniformes d'un denier requis. Cette technique permet ainsi d'obtenir une flexibilité améliorée dans la production de brins et de fils texturés par jet d'air de différents deniers. Les brins produits présentent des caractéristiques utiles qui sont améliorées à certains égards.
PCT/US1991/008381 1991-11-18 1991-11-18 Ameliorations relatives a des brins, des fils et des cables de polyester WO1993010293A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1991/008381 WO1993010293A1 (fr) 1991-11-18 1991-11-18 Ameliorations relatives a des brins, des fils et des cables de polyester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1991/008381 WO1993010293A1 (fr) 1991-11-18 1991-11-18 Ameliorations relatives a des brins, des fils et des cables de polyester

Publications (1)

Publication Number Publication Date
WO1993010293A1 true WO1993010293A1 (fr) 1993-05-27

Family

ID=22225956

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/008381 WO1993010293A1 (fr) 1991-11-18 1991-11-18 Ameliorations relatives a des brins, des fils et des cables de polyester

Country Status (1)

Country Link
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156071A (en) * 1977-09-12 1979-05-22 E. I. Du Pont De Nemours And Company Poly(ethylene terephthalate) flat yarns and tows
US4195051A (en) * 1976-06-11 1980-03-25 E. I. Du Pont De Nemours And Company Process for preparing new polyester filaments
US4933427A (en) * 1989-03-03 1990-06-12 E. I. Du Pont De Nemours And Company New heather yarns having pleasing aesthetics
US4970038A (en) * 1988-11-29 1990-11-13 Basf Corporation Process of preparing polyester yarn

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195051A (en) * 1976-06-11 1980-03-25 E. I. Du Pont De Nemours And Company Process for preparing new polyester filaments
US4156071A (en) * 1977-09-12 1979-05-22 E. I. Du Pont De Nemours And Company Poly(ethylene terephthalate) flat yarns and tows
US4970038A (en) * 1988-11-29 1990-11-13 Basf Corporation Process of preparing polyester yarn
US4933427A (en) * 1989-03-03 1990-06-12 E. I. Du Pont De Nemours And Company New heather yarns having pleasing aesthetics

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