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
  • D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
  • D02G1/125—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes including means for monitoring or controlling yarn processing
• • 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
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/01—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with hydrogen, water or heavy water; with hydrides of metals or complexes thereof; with boranes, diboranes, silanes, disilanes, phosphines, diphosphines, stibines, distibines, arsines, or diarsines or complexes thereof
  • D06M11/05—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with hydrogen, water or heavy water; with hydrides of metals or complexes thereof; with boranes, diboranes, silanes, disilanes, phosphines, diphosphines, stibines, distibines, arsines, or diarsines or complexes thereof with water, e.g. steam; with heavy water

Definitions

• This invention relates to a process for crimping, specifically, drawn nylon 6 yarn carrying a lubricant finish thereon, said process being of the type wherein the yarn is forced into a pressure crimping zone.
• My process is especially suitable for use with heavy denier multi-filament yarns having denier of say 10005000 and filament count of say about 50-250.
• Crimpers of the general type employed in my process are well-known, being disclosed for example in U.S.P. 2,734,228 of February 14, 1956 to W. D. Hay for Crimping Apparatus; USP. 2,763,898 of September 25, 1956 to C. W. Sammons et al. for Treatment of Textile Fibers; U.S.P. 2,865,080 of December 23, 1958 to R. A. A. Hentschel for Method and Apparatus for Crimping and Relaxing Filaments and U.S.P. 2,888,733 of June 2, 1959 to Harry Wegener for Process for the Fixation of Pressure Crimped Synthetic Fibers.
• the prior art crimpers tend to be unsatisfactory with respect to uniformity of crimp frequency obtained therewith.
• My process comprises contacting a drawn nylon 6 yarn carrying a lubricant finish thereon with dry steam in a steaming zone prior to introduction of the yarn into the crimping chamber, said dry steam being at or slightly above saturation temperature and pressure.
• dry steam being at or slightly above saturation temperature and pressure.
• the yarn thus treated with steam is fed at moisture content of about 2-3% by weight into the crimping chamber and receives no supply of heat and no setting agent other than said steam.
• the yarn in the crimping zone is at a temperature between about 60 C. and about 90 C.
• the desired temperature and moisture content of the yarn will usually be obtained using steam as above specified within a short contact time of the order of about 1 second.
• the yarn temperature resulting from this contact may be close to that of the steam itself, but in general the yarn will cool in the crimping chamber as the result of heat losses therefrom, thus reaching the desired temperature range of about 60- 90 C.
• Preferred operating conditions in my process involve maintaining the temperature of the steam while under pressure, just before the steam enters the steaming zone, in the range between about C. and about C. and the pressure of this steam in the range between about 3 and about 5 p.s.i.g., and maintaining the steam in the steaming zone at about atmospheric pressure and atabout 101 C.
• These conditions can be established by generating steam at say 15 p.s.-i.g. and then reducing the pressure on this steam through an automatically controlled valve while maintaining back pressure by use of an orifice with a very small opening just ahead of the inlet to the steaming zone.
• a superheater is desirably provided having means for automatically con trolling the steam temperature within about 1 C.
• the steam temperature and steam pressure should be sensed as near as possible to the orifice which creates the back pressure.
• the steam leaving the orifice suitably enters a tube serving as steaming zone, at the bottom thereof and about at a mid-point.
• the steam tube is tilted away from the crimper so as to drain any condensate without allowing the condensate to contact the yarn.
• a blower is provided at the exit from the steam tube to withdraw the steam before it can contact the crimper feed rolls and condense thereon.
• a particularly suitable crimper of the stuffing box type for use in my process is described in detail in my copending application Serial No. 26,876 filed simultaneously herewith, wherein a sensitive switch is actuated by motion of the gate of the crimper to stop the feed rolls when the yarn volume in the crimping chamber reaches a predetermined point, and the opposite motion of the gate is limited by a stop bar or the like.
• the nylon 6 yarn employed was of 2100 denier and 112 filament count and had from 0 t0 1/2Z twist per inch. It was produced generally in conventional manner by melt spinning, applying a lubricating oil emulsion finish to the spun filament, drawing the filament on a draw twister over a snubbing pin and a heated block and taking up on a pirn. Six ends of this yarn were threaded through eye holes in the inlet and outlet of a steam tube about 29" long. The steam was initially maintained at back pressures constant within 2 ounces per square inch ranging between 3 and p.s.i.g, and at temperatures, corresponding to said pressures, constant within 1 C. and ranging from 104 C. to 109 C. The steam was withdrawn from the tube by pipes and a blower, to avoid condensation on the crimper feed rolls.
• This steam had saturation temperature of about 101 C. corresponding to saturation pressure of about 1 /2 p.s.i.g.
• the steam outlets from the steam tube were small enough to maintain the steam under slight superatmospheric pressure therein.
• the steam when allowed to issue into the air from the steam tube did not condense to a fog until it had cooled slightly in the air.
• the temperature of the steam tube was 101 011 C.
• the six yarn ends were withdrawn to the crimper as a fiat ribbon from the steam tube.
• the rate of yarn feed to the crimper in feet per minute varied from 730 to 770; the weight on the crimper gate was 1 pound; the maximum movement of the gate was 3 and the rate of winding up the crimped yarn varied from 560-570 feet per minute, being adjusted to take up the yarn slightly slow er (on a weight basis) than the yarn was fed whereby the switch periodically stopped the feed rolls momentarily.
• the temperature of the yarn entering the crimper was about that of the steam tube, say about 95 100 C. and may have risen just beyond the nip rolls; but in the main body of the crimping chamber the yarn was about 70 C. and its moisture content entering the crimper was about 2.5% by weight.
• a process of crimping drawn nylon 6 yarn carrying a lubricant finish thereon by forcing the yarn into a pressure crimping zone which process comprises contacting said yarn with dry steam in a steaming zone prior to introduction of the yarn into the crimping zone, said dry steam being at about its saturation temperature and pressure and being maintained just before said steaming zone at higher temperature of at least about 103 C. and not above about 130 C.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Treatment Of Fiber Materials (AREA)

Priority Applications (7)

Applications Claiming Priority (1)

Publications (1)

Family

ID=21833330

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (2)

Citations (2)

• 0
  • NL NL264302D patent/NL264302A/xx unknown
  • NL NL125882D patent/NL125882C/xx active
• 1960
  • 1960-05-04 US US26702A patent/US3031734A/en not_active Expired - Lifetime
• 1961
  • 1961-04-26 GB GB15159/61A patent/GB904918A/en not_active Expired
  • 1961-04-27 DE DE19611435317 patent/DE1435317A1/de active Pending
  • 1961-04-27 CH CH503061A patent/CH401345A/de unknown

Patent Citations (2)

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