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
• • 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
  • D02G1/122—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes introducing the filaments in the stuffer box by means of a fluid jet

Definitions

• the invention relates to a method for upsetting a multifilament thread according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 12.
• a multifilament synthetic continuous yarn is fed into a by means of a conveying nozzle
• the delivery nozzle has an injector, which introduces a pressure fluid into a delivery channel of the delivery nozzle.
• the crimping effect is based on the fact that the yarn is heated by using a hot conveying medium and jammed in a stuffer box adjoining the conveying nozzle and formed into a stopper.
• the thread stopper is transported out of the stuffer box at a defined speed by a conveyor roller attached behind the crimping device and then cooled.
• Thread tension is not sufficient to pull the thread safely into the crimping device.
• An increased pressure of the pumped medium leads but on the other hand to the fact that the thread plug is blown out of the stuffer box, since the frictional forces between the thread plug and stuffer box wall are no longer sufficient.
• the conveyor roller downstream of the crimping device can, because of the risk of
• Winder formation can no longer be used.
• Crimping device a relief zone in which the conveying fluid guided within the conveying channel can expand.
• the thread is puffed up by loosening the filament bundle.
• the known device thus has the disadvantage that at higher thread speeds and thus higher fluid pressures, the expanded
• Filament bundle hangs in the transition area between the relief chamber and the last section of the thread channel, thus creating an unwanted thread plug in the relief chamber.
• Another disadvantage of the known device is that the filing of the thread in the stuffer box only in dependence on that in the last part of the
• the invention has the particular advantage that the thread is fed to the crimping device in two downstream stages.
• the first conveyor stage is designed such that the thread is drawn into the device at high thread speed.
• the thread speed in the first stage is referred to here as the feed speed.
• the second funding stage that of the first
• the thread already starting at high speed is conveyed into the crimping device at a conveying speed.
• the conveying speed in the second stage is at least equal to or greater than the drawing-in speed of the first stage. This ensures that a minimum thread tension in the thread is not undercut, so that the filament bundle remains closed between the two stages.
• Another advantage of the invention lies in the fact that the conveying of the thread into the stuffer box can essentially only be adjusted to the requirements of plug formation.
• the threading of the thread to build up high thread speeds is generated by the conveying fluid flow in the first stage.
• the method according to the invention is particularly suitable for very high thread speeds, the feed speed being at least 3,000 m / min, preferably at least 4,000 m / min.
• the thread is preferably drawn out of a spinning zone by means of a drafting device and, after being drawn, is taken up by the conveying nozzle of the first stage.
• the feed speed in the first stage is particularly thereupon to ensure that the thread tension of the incoming thread does not fall below, for example, 10 cN.
• Delivery fluid flow in the first delivery stage and the second delivery fluid flow in the second delivery stage are controlled independently of one another. This allows fine adjustments to be made both to build up thread tension in the upstream thread run and to form crimps in the stuffer box.
• the feed fluid is kept in the first stage at a pressure of at least 2 bar to a maximum of 15 bar, preferably at least 4 bar to a maximum of 12 bar.
• the pressure of the delivery fluid for generating the second delivery fluid stream is set in a smaller range from at least 1 bar to a maximum of 8 bar, preferably at least 2 bar to a maximum of 6 bar.
• the pressure of the conveying fluid in the first stage has a higher value than the pressure of the conveying fluid in the second stage.
• the exact setting values are also dependent on the aforementioned parameters such as polymer type, thread tension, crimp formation, etc.
• the delivery fluid for the first delivery fluid stream and the second delivery fluid stream is introduced through a common injector. This is between the
• Delivery nozzles formed an expansion chamber in which the outlet of the delivery channel of the first delivery nozzle and the inlet of the delivery channel of the second delivery nozzle open.
• the expansion chamber is connected to a controllable throttle valve, so that part of the first conveying fluid flow entering the expansion chamber can be discharged.
• the controllable throttle valve enables the discharge fluid flow to be adjusted.
• crimping of 25% and crimping stability of 85% at 4 cN / dtex thread tension could be achieved with pre-stretched polyester yarns of specification 167f46 and 83f36 at thread delivery speeds of 5100 m / min.
• the values for crimping and crimping stability were determined in accordance with DIN 53 840 Part 1.
• Hot air is particularly suitable as the conveying fluid medium. It was found that the crimping of the yarn increased with increasing hot air temperature, an upper limit of 180 ° C. for polyester and 240 ° C. for polyamide being found.
• the device according to the invention has two delivery nozzles, each with a nozzle-shaped delivery channel.
• Conveyor nozzles are arranged one behind the other in the thread running direction in such a way that the outlet of the one conveying channel is directly opposite the inlet of the second conveying channel.
• Two conveying fluid flows can be generated independently of one another by the conveying nozzles in order to draw in the thread in a first stage and in a second downstream stage in the
• each of the delivery nozzles has an injector in order to in each case introduce a fluid flow into the assigned delivery channels.
• the injectors can be supplied individually or together by a controllable pressure source. In the case of a common pressure source supply, means for pressure adjustment must be provided separately from one another.
• the delivery nozzles are connected in such a way that an expansion chamber is formed between the delivery channels, the outlet cross section of the delivery channel opening into the expansion chamber being larger than the narrowest cross section of the downstream delivery channel, so that delivery of the delivery fluid in the downstream delivery channel remains guaranteed.
• the expansion chamber is connected to a controllable throttle valve.
• the conveying channel formed in the first conveying nozzle is preferably designed as a Laval nozzle, so that the conveying fluid can reach the speed of sound in a narrowest cross section of the Laval nozzle.
• the delivery channel of the second delivery nozzle opens directly into the stuffer box.
• outlet of the delivery channel and the inlet of the stuffer box are arranged in a vacuum chamber.
• Stuffer box is connected to the vacuum chamber via opening slots, which is connected to a controllable vacuum source.
• a cooling drum is preferably arranged downstream of the crimping device.
• the thread plug is guided around the circumference of the cooling drum and cooled by a cooling medium, preferably cooling air.
• FIG. 1 shows an arrangement with a device according to the invention for performing the method according to the invention
• FIG. 2 shows a first exemplary embodiment of an apparatus for performing the method according to the invention in section
• Fig. 3 shows another embodiment of an apparatus for performing the method according to the invention in section.
• FIG. 1 schematically shows an arrangement with a device according to the invention for performing the method according to the invention.
• the thread 1 is fed in the thread running direction 2.
• the thread 1 can be fed directly from a spinning device or from a supply spool.
• the arrangement consists of a first godet unit 3, a downstream godet duo 4 and a compression crimping device 5, viewed in the direction of the thread.
• the compression crimping device 5 is one
• a further godet unit 8 is provided in the thread path behind the cooling drum 7.
• the thread 1 is drawn off from the godet unit 3, which is formed from a driven godet and an overflow roller, from a spinning device or a supply spool.
• the thread 1 is stretched between the godet unit 3 and the godet duo 4.
• the godet duo 4 is formed from two driven godets, preferably at least one of the godets being heated.
• the thread 1 is then drawn into the shrub crimp 5, requested and formed into a thread plug 6. In a crimping device
• Cooling drum running cooling section is cooled.
• the crimp is fixed.
• the crimped thread 1 is pulled off the cooling drum 7 by means of the godet unit 8, the thread stopper 6 loosening again, but the crimping of the filaments is retained.
• a first exemplary embodiment of the shrimp curling device shown schematically in FIG. 1 is shown schematically in a section in FIG. 2.
• the upsetting device 5 consists of a first one Delivery nozzle 24, a second delivery nozzle 25 and a crimping device 26.
• the delivery nozzles 24 and 25 and the crimping device 26 are combined to form a component.
• the conveying nozzle 24 has a nozzle-shaped conveying channel 13, which is connected on the upper side to a thread inlet 9 and on the underside to an expansion chamber 14.
• the delivery channel 13 is preferably designed as a lava nozzle.
• the delivery nozzle 24 has an injector 12 in the inlet area of the delivery channel 13.
• the injector 12 is connected via an inlet 11 to a pressure source, not shown here.
• the injector 12 opens into the delivery channel 13 with several injector bores.
• a second delivery nozzle 25 is arranged directly below the first delivery nozzle 24.
• the conveying nozzle 25 has a conveying channel 16 which opens into the expansion chamber 14 on the upper side and is connected to a stuffer box 17 of the crimping device 26 on the underside.
• the expansion chamber 14 is formed between the delivery channel 13 of the first delivery nozzle 24 and the delivery channel 16 of the second delivery nozzle 25.
• the expansion chamber 14 is coupled to a throttle valve 27 via a relief channel 15.
• the crimping device 26 is formed below the second delivery nozzle 25.
• the crimping device 26 has a stuffer box 17.
• the stuffer box 17 is surrounded by a vacuum chamber 19 in the upper region.
• the vacuum chamber 19 is connected to a vacuum source 20.
• the stuffer box 17 and the vacuum chamber 19 are connected to one another via a plurality of slot-shaped openings 18.
• the openings 18 are made in the cylindrical chamber wall of the stuffer box 17 in the region of the vacuum chamber 19. Outside the vacuum chamber 19, the outlet valve 21 of the stuffer box 17 is formed. - ⁇ o.
• the thread 1 is drawn through the thread inlet 9 into the conveying channel 13 at a drawing-in speed.
• a delivery fluid 10 is introduced into the delivery channel 13 via the injector 12 via an inlet 11.
• the pressure of the conveying fluid 10 at the inlet 11 is dimensioned such that the threading speed of the thread 1 maintains sufficient thread tension at the thread inlet 9.
• the conveying fluid 10 is guided within the conveying channel 13 to a first conveying fluid stream, which demands the thread 1.
• the conveying fluid flow and the thread 1 pass through the conveying channel 13, which in this exemplary embodiment is designed as a Laval nozzle.
• the expansion chamber In the expansion chamber
• the conveying fluid flow is expanded and the pressure of the conveying fluid 10 decreases.
• a partial flow of the delivery fluid is discharged through the relief channel 15 via the throttle valve 27.
• the quantity of the partial flow 10.1 can be adjusted by means of the throttle valve 27.
• a remaining partial flow 10.2 of the delivery fluid is by means of the delivery channel
• the pressure in the expansion chamber 14 is dimensioned such that the second flow of conveying fluid brings about a conveying speed of the thread which is at least the same but preferably greater than that
• Thread retraction speed Between the stages, a thread tension is generated in the thread, which prevents premature dissolution of the filament bundle and thus ensures that the thread is securely conveyed further into the stuffer box 17. While the main constituent of the second conveying fluid stream 10.3 is discharged through opening slots 18 after leaving the conveying channel 16, the thread 1 builds up with loops and forms a thread stopper 6. As shown in this example, the removal of the conveying fluid can be supported by a vacuum chamber 19 from which the conveying fluid is removed by means of a vacuum source 20. Through the outlet opening 21 of the
• Stuffer box 17 the thread plug 6 leaves the crimping device 5.
• the thread 1 in the stuffer box 17 is initially not jammed into a thread plug 6.
• a brake fluid 22 is guided via a feed opening 23 into the stuffer box 17 in such a way that the brake fluid 22 exerts a braking effect on the thread 1 and thus the jam formation
• FIG. 3 schematically shows a further exemplary embodiment of a compression crimping device, such as would be used, for example, in the arrangement in FIG. 1.
• the upsetting device consists of a first delivery nozzle 24, a second delivery nozzle 25 and a crimping device 26.
• the delivery nozzle 24 is designed as a separate component.
• the delivery nozzle 25 and the crimping device 26 are integrated into one component.
• the second delivery nozzle 25 is arranged at a short distance or immediately below the delivery nozzle 24.
• the conveying nozzle 25 has a nozzle-shaped conveying channel 16 which is connected on the upper side to a thread inlet 9.2 and on the underside to the stuffer box 17 of the crimping device 26.
• An injector 12.2 is assigned to the delivery channel 16.
• the injector 12.2 is connected via the inlet 11.2 with one not shown here
• a feed fluid under pressure is introduced into the feed channel 16 via the feed 11.2 and the injector 12.2.
• the conveying fluid is guided to a conveying fluid stream which conveys the thread 1 through the conveying channel 16 into the stuffer box 17.
• the conveying fluid flow in the conveying nozzle 24 is formed by the conveying fluid which is supplied to the conveying channel 13 by the injector 12.1.
• the second conveying fluid flow in the conveying nozzle 25 is formed by the conveying fluid which is introduced into the conveying channel 16 through the injector 12.2.
• the method according to the invention and the device according to the invention are characterized in that two feed fluid streams which can be generated independently of one another are used to pull the thread and to convey the thread into the stuffer box.
• the pressure of the supplied fluid can be selected such that a minimum thread tension is maintained. Pressures of up to 15 bar are possible.
• the fluid for conveying the thread into the stuffer box is dimensioned in such a pressure that a reliable plug formation within the stuffer box is ensured.
• the pressure of the fluid for conveying the thread is preferably set between a value of 2 bar and a maximum of 6 bar.
• the method according to the invention is suitable for all types of polymer.
• yarns made of polyester, polyamide or polypropylene can be used. All types of polyester such as PET, PPT or PTT are suitable.
• the process according to the invention made it possible, for example, from a polyester yarn of specification 167f46 and 63 ⁇ 6
• Thread delivery speeds of 5,100 m / min a crimp of 25% and a crimp stability of 65% at 4 cN / dtex thread tension can be achieved. This makes it possible to produce, in particular, textile crimped yarns directly from freshly spun threads in one process step. LIST OF REFERENCE NUMBERS

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Disintegrating Or Milling (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Applications Claiming Priority (3)

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• 2001
  • 2001-02-22 AT AT01927686T patent/ATE409763T1/de active
  • 2001-02-22 KR KR1020027011449A patent/KR100746053B1/ko not_active Expired - Fee Related
  • 2001-02-22 DE DE50114368T patent/DE50114368D1/de not_active Expired - Lifetime
  • 2001-02-22 CN CN018058841A patent/CN1218073C/zh not_active Expired - Fee Related
  • 2001-02-22 WO PCT/EP2001/001993 patent/WO2001064982A2/fr not_active Ceased
  • 2001-02-22 MX MXPA02008443A patent/MXPA02008443A/es unknown
  • 2001-02-22 JP JP2001563663A patent/JP2003525359A/ja active Pending
  • 2001-02-22 EP EP01927686A patent/EP1264020B1/fr not_active Expired - Lifetime
  • 2001-02-22 AU AU2001254657A patent/AU2001254657A1/en not_active Abandoned
• 2002
  • 2002-09-03 US US10/233,736 patent/US6826813B2/en not_active Expired - Fee Related

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