EP0250664B1 - Verfahren zum Zusammenfügen und Zusammenverstrecken von antistatischen Fasern mit nichtverstreckten Nylonfasern - Google Patents

Verfahren zum Zusammenfügen und Zusammenverstrecken von antistatischen Fasern mit nichtverstreckten Nylonfasern Download PDF

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Publication number
EP0250664B1
EP0250664B1 EP86305069A EP86305069A EP0250664B1 EP 0250664 B1 EP0250664 B1 EP 0250664B1 EP 86305069 A EP86305069 A EP 86305069A EP 86305069 A EP86305069 A EP 86305069A EP 0250664 B1 EP0250664 B1 EP 0250664B1
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EP
European Patent Office
Prior art keywords
filaments
yam
conductive
combined
yarn
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86305069A
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English (en)
French (fr)
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EP0250664A1 (de
Inventor
Jack Renato De Howitt
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EIDP Inc
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EI Du Pont de Nemours and Co
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Filing date
Publication date
Priority to US06/555,513 priority Critical patent/US4612150A/en
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to DE8686305069T priority patent/DE3674795D1/de
Priority to EP86305069A priority patent/EP0250664B1/de
Priority to BR8603045A priority patent/BR8603045A/pt
Publication of EP0250664A1 publication Critical patent/EP0250664A1/de
Application granted granted Critical
Publication of EP0250664B1 publication Critical patent/EP0250664B1/de
Expired legal-status Critical Current

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    • 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

Definitions

  • Windley U.S. 3,971,202 describes the cobulking of electrically conductive sheath-core filaments such as are disclosed in Hull, U.S. Patent 3,803,453, with nonconductive filaments to form a composite yarn.
  • the conductive filaments are melt- spun at a rate of about 890 yards per minute, ypm, (813 meters per minute, mpm) and then drawn at least about 2.0 x on a draw twister, to increase tenacity.
  • the strength is needed for subsequent processing, e.g., in the hot cobulking jet with the non conductive fibers.
  • the separately drawn conductive and nonconductive filaments are then combined on a roll in a hot chest where they are annealed to reduce shrinkage and then the combined yarns are cobulked.
  • a process for producing a carpet yarn with reduced static propensity comprising melt spinning a plurality of nonconductive nylon filaments into a quench chimney, pneumatically introducing spin-oriented electrically conductive bicomponent filaments into the freshly spun threadline within the quench chimney, consolidating the combined yarn at a puller roll, drawing and cobulking the combined yarn and then winding up the yam.
  • the process of the present invention provides a carpet yam with reduced static propensity.
  • the yarn is made up of conductive bicomponent filaments in an amount of less than about 10 wt %, preferably from 1 to 10 wt %, with the remainder being nonconductive filaments.
  • the conductive filaments be as thin as possible, i.e., of low denier.
  • the conductive filaments containing a polymer component having carbon black to provide electrical conductivity generally have a dark appearance and thin dark filaments are less conspicuous to the eye.
  • the thin filaments also provide an economic advantage since the level of antistatic performance is not comparably reduced, with denier reduction, i.e., the thinner filaments retain most of the antistatic capabilities of the thicker filaments, in spite of the fact that less conductive material is used.
  • the conductive filaments used in this invention are prepared by high speed spinning of bicomponent filaments as described below.
  • the preferred bicomponent filaments are sheath/core, i.e., where the nonconductive component fully encapsulates a conductive core and this specification will describe their preparation in detail.
  • filaments as described by Boe U.S. 3,969,559 wherein the nonconducting component (or constituent) encapsulates or surrounds more than 50% but less than all of the conducting component are also included, although less preferred because of limitations on the types of conductive material that may be employed and for other reasons.
  • the sheath component polymers that may be used for the conductive filaments of the present invention are the same as those disclosed in the Hull patent, supra. Titanium dioxide, while not necessary for this invention is added conventionally to the sheath as a delusterant and to improve hiding of the core. Substantially greater amounts of Ti0 2 than disclosed in Hull may be added to the sheath polymer, if desired.
  • the preferred sheath polymer is a polyamide e.g. polyhexamethylene adipamide.
  • the core component materials that may be used are the same as those disclosed by Hull and may be prepared similarly.
  • the preferred core polymer is a polyolefin, most preferably, polyethylene.
  • the core polymer should contain between 15 and 50% by wt of the electrically conductive carbon black dispersed therein. Preferably, the core will constitute less than 10% by volume of the conductive filament.
  • Spinning of the sheath/core filaments useful in this invention is accomplished as shown in Figure 1.
  • the core and sheath materials of filaments 1 are extruded from a spinneret assembly 2 into quench chimney 3 and are cross-flow quenched by roomtemperature air flowing from right to left.
  • the filaments After cooling to a non-tacky state, the filaments are converged into a yam by guide 4 and pass through steam conditioner tube 5, through guide 6, over finish roller 7 immersed in finish bath 8 through guide 9, then wrapped around high-speed puller roll 10 and associated roller 11, and are wound up as package 12 in a manner similar to Hull, except that the filaments are attenuated by pulling the filaments away from the quenching zone as shown in Adams U.S.
  • Patent 3,994,121 at a speed of at least 800 ypm (732 mpm), preferably between 1250 and 1500 ypm (1143 and 1372 mpm).
  • the spinning speed is the speed at which the yam leaves the quenching zone and is equivalent to the peripheral speed of the puller or feed rolls.
  • the spinning speed is adjusted to produce filaments having a preferred denier from about 6 to 11.
  • the resulting filaments are characterized by having a tenacity of from about 1 to 3 gpd, an elongation of between 200 and 500%.
  • a similar extrusion process to that in Boe may be employed and the filaments attenuated by pulling from the quenching zone at the appropriate speed.
  • the polymer has a relative viscosity (RV) of 40.
  • a polyethylene resin (Alathon 4318, density - .916, melt index - 23 ASTM-D-1238, 50 ppm antioxidant, manufactured by Du Pont) is combined with electrically conductive carbon black in the ratio 71.55 resin to 28.2 carbon black by weight with 0.25% by weight
  • Antioxidant 330 (Ethyl Corporation 1,3,5-trimethyl-2,4,6-tris(3,5-ditertiarybutyl-4-hydroxybenzyl) benzene.
  • the carbon black is Vulcan XC-72 available from the Cabot Corporation, Boston, Mass.
  • the carbon black dispersion is compounded in a Banbury mixer, extruded, filtered and pelletized. The pellets are remelted, extruded and filtered through filter media retaining 31 micron particulates, and pelletized. Specific resistance, measured as described by Hull U.S. 3,803,453, is less than 10 ohm-cm.
  • the polymers are spun using a spinneret assembly to spin concentric sheath core filaments by the technique shown in U.S. Patent Nos. 2,936,482 and U.S. 2,989,798.
  • the sheath polymer is melted at 285 ° C at atmospheric pressure and is fed to a pack filter at a rate of 32.9 gm/min.
  • the core polymer containing 1% moisture is melted in a screw melter. Molten polymer is fed through a filter pack at a rate of 1.4 gm/min.
  • the spinning block temperature is 285 ° C. the core polymer supply hopper is purged with dry inert gas.
  • the RV of sheath polymer coming from the spinneret is about 47, the increased RV resulting from further polymerization of nylon while being melted.
  • Antistatic filaments are obtained by extruding the molten polymer materials from a spinneret with 24 capillaries.
  • the extruded filaments pass through a 45 in (1.14 m) ling chamber where they are cross-flow quenched with room temperature air. They then contact guides which converge them into yarns each containing three filaments.
  • the yarns are passed into a 78 in (1.98 m) long steam conditioning tube (see Adams U.S. 3,994,121, Ex. I) into which 1.8 psig (12.6 kPa) steam is introduced from two .04 in (1 mm) orifices near the top of the tube and one 0.050 in (1.27 mm) orifice near the center of the tube.
  • Finish is then applied to the yarn.
  • the yarn is spun at a feed roll speed of 1250 ypm (1143 mpm) and the yarn is packaged at 4.4 gms/denier tension.
  • spin-oriented The three-filament yarns which have been oriented by spinning, hence "spin-oriented", are characterized by having a tenacity of 1.8 gm/den and an elongation of 300%. Denier was 33. Precent core is 2% by volume. Percent sheath is 98%.
  • Figure 2 shows production of two ends of carpet yarn.
  • polyhexamethylene adipamide (72 RV) for the nonconductive yarns (80 filaments per end) is melt spun at 295-300°C into a quench chimney 21 where a cooling gas is blown past the hot filaments 20 at 370 scfm (10.5 m 3 /m).
  • the filaments are pulled from the spinneret 22 and through the quench zone by means of puller or feed roll 23 rotating at 860 ypm (786 mpm).
  • the conductive yarns 24 described above fed from packages are directed by a gaseous stream via forwarding jet 25 fed with air at 30 psig (206.9 kPa gauge) into the nonconductive threadlines approximately 2 feet (0.6096 m) below the spinneret and become part of the threadlines as they travel to the feed roll.
  • air to the forwarding jet is discontinued.
  • the integral threadlines 20' are each converged and treated with finish by contacting finish roller 26 which is partially immersed in a finish trough (not shown). Proper contact with the finish rollers is maintained by adjustment of "U" guides 27.
  • the threadlines pass around the feed roll 23 and its associated separator roll 28 around draw pin assembly 29, 30 to draw rolls 31 (internally heated to produce a surface temperature of 208°C) rotating at 2580 ypm (2359 mpm) which are enclosed in a hot chest (not shown), where they are forwarded by the rolls 31 at a constant speed through yarn guides 32 and through the yarn passageways 33 of the jet bulking devices 34.
  • the threadlines 20' are subjected to the bulking action of a hot air (220 ° C) directed through inlets 35 (only one shown).
  • the hot fluid exhausts with the threadlines against a rotating drum 36 having a perforated surface on which the yarns cool to set the crimp.
  • the threadlines in bulky form pass to a guide 37 and in a path over a pair of guides 38 then to a pair of driven take-up rolls 39.
  • Bulky yarns of this type are disclosed in U.S. Patent No. 3,186,155 to Breen and Lauterbach.
  • the threadlines 20' are then directed through fixed guides 40 and traversing guides 41 onto rotating cores 42 to form packages 43.
  • Each end of the carpet yam is 1220 denier (1332 dtex) and contains 83 filaments.
  • a & B Two other processes are described below as controls A & B.
  • the conductive filaments are combined with the nonconductive filaments on the hot rolls as shown in U.S. 3,971,202.
  • B the conductive filaments are combined with the nonconductive filaments at the draw pin.
  • the level of filament breaks on the package of combined yarn in the process of the invention was only 7% of that of process A and only 10% of that of process B.
  • the number of gained and lost filaments for the process of the invention was 0 per 100,000 lbs. (45 360 kg) of yarn, vs. 3 for process A and 2 for process B.
  • the new process provides a reduced consumption of the more expensive conductive fiber while still achieving adequate static protection levels.

Claims (4)

1. Verfahren zum Herstellen eines Teppichgarns mit verminderter statischer Neigung, das aufweist, daß eine Mehrzahl von nichtleitenden Nylonfilamenten in einem Abschreckschacht schmelzgesponnen wird, die spinnorientierten, elektrisch leitenden Zweikomponentenfilamente pneumatisch in den frisch gesponnenen Fadenlauf in dem Abschreckschacht eingetragen werden, das zusammengefügte Garn an einer Zugwalze verfestigt wird, das zusammengefügte Garn gestreckt und zusammen aufgebauscht wird und daß dann das Garn aufgewickelt wird.
2. Verfahren nach Anspruch 1, bei dem die elektrisch leitenden Zweikomponentenfilamente eine synthetische, thermoplastische faserbildende Polymerkomponente haben, die mehr als 50 % der leitenden Kernkomponente einhüllt, wobei die letztgenannte ein synthetisches, thermoplastisches Polymer aufweist, das darin dispergierten, elektrisch leitenden Ruß enthält.
3. Verfahren nach Anspruch 2, bei dem die Komponente, die den Kern einhüllt, Nylon ist.
4. Verfahren nach Anspruch 1, bei dem die Zweikomponentenfilamente in einer Menge von 1 bis 10 Gew.-% des zusammengefügten Garns eingebracht werden.
EP86305069A 1983-11-28 1986-06-30 Verfahren zum Zusammenfügen und Zusammenverstrecken von antistatischen Fasern mit nichtverstreckten Nylonfasern Expired EP0250664B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US06/555,513 US4612150A (en) 1983-11-28 1983-11-28 Process for combining and codrawing antistatic filaments with undrawn nylon filaments
DE8686305069T DE3674795D1 (de) 1986-06-30 1986-06-30 Verfahren zum zusammenfuegen und zusammenverstrecken von antistatischen fasern mit nichtverstreckten nylonfasern.
EP86305069A EP0250664B1 (de) 1986-06-30 1986-06-30 Verfahren zum Zusammenfügen und Zusammenverstrecken von antistatischen Fasern mit nichtverstreckten Nylonfasern
BR8603045A BR8603045A (pt) 1986-06-30 1986-06-30 Processo para produzir um fio de tapete com propensao estatica reduzida

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP86305069A EP0250664B1 (de) 1986-06-30 1986-06-30 Verfahren zum Zusammenfügen und Zusammenverstrecken von antistatischen Fasern mit nichtverstreckten Nylonfasern
BR8603045A BR8603045A (pt) 1986-06-30 1986-06-30 Processo para produzir um fio de tapete com propensao estatica reduzida

Publications (2)

Publication Number Publication Date
EP0250664A1 EP0250664A1 (de) 1988-01-07
EP0250664B1 true EP0250664B1 (de) 1990-10-03

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EP86305069A Expired EP0250664B1 (de) 1983-11-28 1986-06-30 Verfahren zum Zusammenfügen und Zusammenverstrecken von antistatischen Fasern mit nichtverstreckten Nylonfasern

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EP (1) EP0250664B1 (de)
BR (1) BR8603045A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8252385B2 (en) 2005-03-25 2012-08-28 E I Du Pont De Nemours And Company Spin-printing of electronic and display components

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5001813A (en) * 1989-06-05 1991-03-26 E. I. Du Pont De Nemours And Company Staple fibers and process for making them
US7618704B2 (en) 2003-09-29 2009-11-17 E.I. Du Pont De Nemours And Company Spin-printing of electronic and display components
US8143326B2 (en) 2004-09-28 2012-03-27 E.I. Du Pont De Nemours And Company Spin-printing of electronic and display components

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1449372A (fr) * 1965-10-07 1966-08-12 Courtaulds Ltd Fils textiles entrelacés composés de deux ou plusieurs filaments différents
JPS5319071B2 (de) * 1971-10-18 1978-06-19
US3971202A (en) * 1974-08-08 1976-07-27 E. I. Du Pont De Nemours And Company Cobulked continuous filament yarns
US3969559A (en) * 1975-05-27 1976-07-13 Monsanto Company Man-made textile antistatic strand
DE3176146D1 (en) * 1980-08-18 1987-06-04 Akzona Inc Latent contractable elastomers, composite yarns therefrom and methods of formation and use
AR231552A1 (es) * 1982-10-04 1984-12-28 Du Pont Un hilo cohilado antiestatico
US4612150A (en) * 1983-11-28 1986-09-16 E. I. Du Pont De Nemours And Company Process for combining and codrawing antistatic filaments with undrawn nylon filaments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8252385B2 (en) 2005-03-25 2012-08-28 E I Du Pont De Nemours And Company Spin-printing of electronic and display components

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BR8603045A (pt) 1988-02-09
EP0250664A1 (de) 1988-01-07

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