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 device for ruffling a synthetic multifilament thread according to the preamble of claim 1.
• a generic device is known for example from EP 0 554 642 AI.
• the known device For crimping a multifilament thread, the known device has a feed nozzle and a stuffer box arranged downstream of the feed nozzle.
• the thread is conveyed into the compression chamber by means of the conveying nozzle, compressed to a thread stopper and thereby noisy.
• a conveying medium preferably a hot gas, is applied to the conveying nozzle, which urges the thread within a thread channel to the stuffer box.
• the thread plug is formed within the stuffer box.
• the multifilament thread is deposited in loops on the surface of the thread plug and is compressed by the conveying medium, which can escape from the stuffer box above the thread plug.
• the chamber wall of the stuffer box has a plurality of slot-shaped openings on the circumference through which the pumped medium can escape.
• the plug formation in the stuffer box must be very uniform.
• the friction forces generated by the relative movement of the thread plug in the stuffer box have a significant influence on the texturing process. There is an equilibrium of forces between the conveying effect or the dynamic pressure effect of the conveying medium flowing out of the thread channel of the conveying nozzle and the braking effect on the thread stopper caused by the frictional forces.
• the braking effect generated by the friction between the thread plug and the chamber wall essentially depends on the nature of the chamber wall.
• the device known from EP 0 554 642 A1 only small friction surfaces are present, in particular in the section with a gas-permeable wall due to the slot-shaped openings.
• signs of splicing are inevitable as the operating time progresses, which leads to a change in the braking effect.
• If the braking effect drops it can happen that the thread plug is conveyed out of the compression chamber due to low frictional forces. The texturing process then breaks down. With increased frictional forces, however, the thread plug is no longer or no longer evenly challenged from the stuffer box. The result is an uneven crimping of the thread. Uneven crimp also occurs when a stick-slip effect occurs in the stuffer box. These effects cannot be controlled even with a damming medium that counteracts the pumped medium.
• the invention is based on the finding that the filing of the thread on the surface of the thread plug through the loops and arches which form in the significantly affects the uniformity of the crimps.
• the balance of forces between the conveying action and the braking effect generated by the friction on the thread plug must be kept constant.
• the device according to the invention in that the gas-permeable chamber wall has a friction surface made of a wear-resistant material on the inside facing the thread plug. This means that it is not possible to change the friction forces even during very long operating times.
• the invention thus has the advantage that the plug formation can be controlled solely by monitoring the conveyed medium, for example by monitoring the pressure.
• the wear-resistant material on the surface of the chamber wall can basically be formed by two variants.
• the friction surface is formed by a coating applied to the surface of the chamber wall.
• This coating could, for example, consist of a ceramic material or a chrome oxide or a carbon coating.
• the friction surface is formed by the chamber wall made of a ceramic material.
• the chamber wall can be produced, for example, from ceramic materials such as zirconium oxide or aluminum oxide or a combination of both.
• the gas-permeable wall is corrosion-resistant and little is susceptible to contamination. In particular, deposits due to preparation residues can be avoided. Even after a maintenance break, the same friction conditions are achieved when the device is started up as before when the system was switched off.
• the gas-permeable chamber wall can be formed by a cylinder body with longitudinal slots evenly distributed over the circumference.
• the formation of the gas-permeable chamber wall by a plurality of lamellae which are arranged in a ring at a distance from one another is particularly advantageous.
• ceramic lamellas it was observed that by reducing the coefficient of friction, the thread is subjected to less thermal and mechanical stress.
• a further section with a closed chamber wall is also formed on the inside facing the thread plug with a contact surface which consists of a wear-resistant material.
• the contact surface could be formed by a coating applied to the surface of the chamber wall or by the chamber wall made of a ceramic material.
• the thread tension reduction in the feed nozzle was reduced by the friction of the thread on the wall. This means that a higher thread tension can be achieved at the same delivery pressure, which results in higher running reliability of the texturing process, or a thread tension level can be achieved with lower pressure, with a lower delivery pressure leading to lower consumption of the delivery medium.
• the wear-resistant material of the contact surfaces within the delivery nozzle can be formed by coatings or by ceramic base materials.
• the delivery nozzle can also advantageously be made entirely of a ceramic.
• the inlet of the thread channel in the feed nozzle is formed by a guide insert.
• the guide insert which can be made of a ceramic material or could have a coating on its surface, forms an inlet channel in the extension of the thread channel. This particularly prevents wear when the thread enters the feed nozzle. When using ceramic materials or ceramic coatings, the thread can also be guided with very little friction.
• the feed nozzle could also have a guide insert forming the outlet of the thread channel, which is also made of a ceramic material or has a coating on its surface.
• the thread leaves the delivery nozzle through an outlet channel of the guide insert.
• a conveying medium preferably hot air or hot gas
• the air inlet into the thread channel is formed by a guide insert so that no washouts are obtained in the thread channel even at very high flow speeds, which may be in the range of the speed of sound.
• the guide insert contains a guide channel that extends the thread channel is aligned.
• the guide insert also consists of a ceramic material or has a coating on its surface.
• the advantageous further development of the invention according to claim 13 is preferred to be used, in which the guide insert in the area of the air inlet has an additional insert in the inlet area of the guide channel. This allows the thread guide to be stabilized and negative interferences in the thread to be avoided.
• a cooling device is arranged downstream of the stuffer box at the plug outlet, in some cases a conveyor for guiding the thread plug is provided between the cooling device and the stuffer box.
• the conveying means and the cooling device have a coating on the contact surfaces touched by the thread stopper.
• Fig. 1 shows schematically a first embodiment of a device according to the invention in cross section
• Fig. 2 shows schematically a further embodiment of the device according to the invention in partial cross section
• Fig. 3 shows schematically an embodiment of a delivery nozzle in a
• a first embodiment of the device according to the invention is shown schematically in a cross section.
• the device consists of a feed nozzle 1 and a stuffer box 2 arranged downstream of the feed nozzle 1.
• the feed nozzle 1 contains a thread channel 3 which forms an inlet 21 at one end and an outlet 24 at the opposite end.
• the feed nozzle 1 is connected by a feed line 17 to a Draclc source (not shown here).
• the supply line 17 is connected to the thread channel 3 by an air inlet 16 and a pressure chamber 39.
• the air outlet 16 is formed by a plurality of bores which feed a conveying medium to the thread channel 3 in the thread running direction, which is indicated by an arrow. With the outlet 24, the thread channel 3 opens into a plug channel 31 of the stuffer box 2.
• the upsetting chamber 2 is formed by a section 7.1 facing the delivery nozzle 1 with a thread inlet 5 and a section 7.2 downstream of section 7.1 with a plug outlet 6.
• a plug channel 31 is formed by a gas-permeable chamber wall 8.
• the gas-permeable chamber wall 8 contains a plurality of lamellae 9, which are arranged in a ring at a short distance from one another.
• the slats 9 are held by the slat holder 10.1 at the upper end of section 7.1 and by the holder 10.2 at the lower end of section 7.1.
• the slats 9 and the holders 10.1 and 10.2 are arranged in a housing 11, the housing 11 being closed to the outside and being connected to a suction device 12 by an opening 32.
• the lamellae 9 On the side facing a thread plug 13, the lamellae 9 each have a friction surface 14.
• the lamellae 9 are made of a ceramic Who fabricated so that the friction surfaces 14 consist of a low-wear material.
• the plug channel 33 is made larger in diameter than the plug channel 31 in the region of the gas-permeable chamber wall 8.
• the plug channel 33 forms the plug outlet 6 at its end.
• the embodiment of the device according to the invention shown in Fig. 1 is shown with a thread run to illustrate the function of the device.
• the thread 4 in the thread channel 3 is required by the conveying nozzle 1 through a conveying medium supplied via the air inlet 16.
• the thread 4 enters the thread channel 3 via the inlet 21.
• Hot air or a hot gas is preferably used as the conveying medium. Due to the medium flowing at high speed, the thread 4 is conveyed to the stuffer box 2 at high speed.
• a thread plug 13 is formed in the plug channel 31.
• the thread 4, which consists of a plurality of filaments, is placed on the surface of the thread plug 13, so that the filaments form loops and arches. The pumped medium is sucked between the lamellae 9 through the opening 32.
• the thread stopper 13 which forms in the stopper channel 31 lies against the friction surfaces 14 of the lamellae 9.
• the frictional forces and the delivery pressure of the delivery medium acting on the thread plug 13 are essentially in equilibrium, so that the thread plug height within the plug channel 31 remains essentially the same. Since the lamellae 9 are made of a ceramic material, the balance of forces acting on the thread plug 13 is maintained essentially by keeping the pressure of the delivery medium constant.
• the thread plug 13 After leaving the plug channel 31, the thread plug 13 enters the plug channel 33, which is formed by the closed chamber wall 15.
• the closed one Chamber wall 15 which could be designed, for example, as a tube, only serves to guide the thread plug 13 to a downstream cooling device, not shown here.
• the plug channel 33 is made larger than the plug channel 31, so that only slight frictional forces act on the thread plug 13. Wear protection is therefore unnecessary.
• FIG. 2 A further exemplary embodiment is shown schematically in a cross section in FIG. 2.
• the design of the exemplary embodiment is essentially identical to the previous exemplary embodiment according to FIG. 1, so that only the essential differences are shown below. For the sake of clarity, the components with the same functions are provided with identical reference symbols.
• the delivery nozzle 1 has a narrowest cross section for additional acceleration of the delivery medium in the thread channel 3, which cross section is formed immediately below the air inlet 16. As a result, the pumped medium is accelerated to a flow rate that is higher than the speed of sound.
• the thread channel 3 opens into the plug channel 32, which is formed by a cylinder body 18.
• the cylinder body 18 is arranged in the first section 7.1 of the stuffer box 2.
• the cylinder body 18 has a plurality of longitudinal slots 34 distributed around the circumference, as a result of which the plug channel 31 is connected to an annular space 35 formed by the housing 11 and the cylinder body 18. At the annular space 35, the housing 11 is connected to a suction 12 via the opening 32.
• the cylinder body 18 On the side facing the thread plug 13, the cylinder body 18 has a coating 19.
• the coating 19, which forms the friction surface 14 for guiding a thread plug preferably consists of a ceramic material. However, metallic hard chrome layers or carbon compounds are also possible.
• the cylinder body 18 can also be made of an aluminum material which is given an aluminum oxide coating forming the friction surface 14.
• the longitudinal slots 34 extend at least over a partial area of the cylinder body 18.
• the second section 7.2 of the compression chamber is formed by the closed chamber wall 15, which contains the plug channel 33.
• the stopper channel 33 forms the stopper outlet 6 at the end.
• the closed chamber wall 15 has a contact surface 20 on the side facing the stopper 13, which also has a wear-resistant coating 35.
• the upsetting chamber 2 is assigned a conveying means 29 directly at the plug outlet 6, which is formed from two opposing rollers.
• the conveying means 29 guides the thread stopper 13 to a cooling device 30 arranged below the conveying means 29.
• the cooling device 30 could, for example, be formed from a cooling drum, on the circumference of which the thread stopper is cooled. Both the conveying means 29 and the cooling device 30 are provided with a coating on their contact surfaces 37 and 38.
• the function of the exemplary embodiment shown in FIG. 2 is essentially identical to the previous exemplary embodiment according to FIG. 1, so that the representation of the thread path has been omitted.
• the formation of thread plugs can additionally be influenced by the conveying means 29.
• FIG. 3 schematically shows an exemplary embodiment of a delivery nozzle in a cross-sectional view, as would be used, for example, in the exemplary embodiment according to FIG. 1 or in the exemplary embodiment according to FIG. 2.
• the delivery nozzle is shown in Fig. 3.1 in a disassembled state and in Fig. 3.2 in an assembled state.
• Fig. 3.1 in a disassembled state
• Fig. 3.2 in an assembled state.
• the delivery nozzle 1 has an incision 36.1, 36.2 and 36.3 in the area of the inlet 21 in the area of the air inlet 16 and in the area of the outlet 24.
• the incisions 36.1, 36.2 and 36.3 are connected to one another via a thread channel 3.
• a pressure chamber 39 is formed in the delivery nozzle 1 between the incisions 36.1 and 36.2.
• the incision 36.1 in the inlet area of the delivery nozzle 1 serves to receive a guide insert 22.1.
• the guide insert 22.1 forms an inlet channel 23 which is aligned in the extension of the thread channel 3.
• the guide insert 22.1 is preferably made of a ceramic material. However, it is also possible for the guide insert 22.1 to have a coating in the region of the inlet channel 23.
• the guide insert 22.1 is inserted in the incision 36.2.
• the guide insert 22.2 firstly forms the air inlet 16, through which the pumped medium is introduced from the pressure chamber 39 into a guide channel 26 of the guide insert 22.2.
• the guide channel 26 of the guide insert 22.2 is aligned in the extension of the thread channel 3.
• An insert 27 is provided on the inlet side of the guide insert 22 and forms an inlet channel 28.
• the inlet channel 28 has a smaller diameter than the subsequent guide channel 26.
• the insert 27 and the guide insert 22.2 can likewise advantageously be made from a ceramic material or provided with a coating.
• the guide insert 22.3 is embedded in the insert 36.3 on the outlet side of the delivery nozzle 1.
• the guide insert 22.3 forms an outlet channel 25, which is aligned in the extension of the thread channel 3 and forms the outlet 24 of the delivery nozzle 1.
• the guide insert 22.3 is also preferably made of a ceramic material.
• the feed nozzle shown in FIG. 3 consists in particular of the contact points and friction points which are heavily used by the thread, made of a wear-resistant material, so that the thread guide is stable and uniform as well Thread conveyance is achieved. In addition, the coefficient of friction between the thread and the contact points or friction points are significantly reduced.
• the delivery nozzle 1 and the stuffer box 2 are preferably each formed from two halves which are non-positively connected to one another during operation. In principle, however, it is also possible to provide one-piece delivery nozzles and compression chambers with appropriate ceramic inserts or coatings. Regardless of the design of the device, however, there is also the possibility of producing the areas of the device which are contalcated by the thread in each case from an all-ceramic or from a coated aluminum material.
• the device according to the invention is thus particularly characterized by high wear protection and thus stable friction conditions and insensitivity to preparations of the thread as well as a considerable extension of the cleaning cycles due to the insensitivity to soiling.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Insulated Conductors (AREA)
• Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Applications Claiming Priority (3)

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• 2002
  • 2002-06-28 AT AT02740756T patent/ATE353109T1/de active
  • 2002-06-28 WO PCT/EP2002/007161 patent/WO2003004743A1/fr active IP Right Grant
  • 2002-06-28 US US10/482,489 patent/US7318263B2/en not_active Expired - Fee Related
  • 2002-06-28 EP EP02740756A patent/EP1404910B2/fr not_active Expired - Lifetime
  • 2002-06-28 CN CNB028103491A patent/CN100362153C/zh not_active Expired - Fee Related
  • 2002-06-28 DE DE50209409T patent/DE50209409D1/de not_active Expired - Lifetime

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