EP0606434A1 - Dispositif de filage d'un ruban de fibres. - Google Patents

Dispositif de filage d'un ruban de fibres.

Info

Publication number
EP0606434A1
EP0606434A1 EP93915623A EP93915623A EP0606434A1 EP 0606434 A1 EP0606434 A1 EP 0606434A1 EP 93915623 A EP93915623 A EP 93915623A EP 93915623 A EP93915623 A EP 93915623A EP 0606434 A1 EP0606434 A1 EP 0606434A1
Authority
EP
European Patent Office
Prior art keywords
swirl
air inlet
injector
shoulder
inlet bore
Prior art date
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.)
Granted
Application number
EP93915623A
Other languages
German (de)
English (en)
Other versions
EP0606434B1 (fr
Inventor
Herbert Stalder
Andrew S Barritt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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
Priority claimed from DE19924225262 external-priority patent/DE4225262A1/de
Priority claimed from DE4230314A external-priority patent/DE4230314A1/de
Priority claimed from DE4230317A external-priority patent/DE4230317C2/de
Priority claimed from US08/010,265 external-priority patent/US5479680A/en
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP0606434A1 publication Critical patent/EP0606434A1/fr
Application granted granted Critical
Publication of EP0606434B1 publication Critical patent/EP0606434B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/11—Spinning by false-twisting
    • D01H1/115—Spinning by false-twisting using pneumatic means
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides

Definitions

  • the invention relates to a device for spinning a sliver according to the preamble of patent claim 1.
  • a device for nozzle spinning is known from DE 3541219 AI. This device consists of an injector part and a swirl part adjoining it. The injector and swirl part are arranged directly after a drafting system for drawing a fiber sliver. A good yarn is produced in such a device, but the winding of the yarn core with edge fibers is not entirely satisfactory.
  • EP-A-418 694 shows a nozzle construction which, by means of an insert, creates a "shoulder" in the thread passage, with air inlet bores opening into the passage after the shoulder (viewed in the direction of passage). This construction also represents a step forward, but it is not the optimal solution.
  • EP-A-449 073 and EP-A-450 371 show drafting arrangements which are suitable for nozzle spinning. .
  • an optimal nozzle spinning system consists of three essential elements, namely:
  • a device for example a drafting system
  • takes on the task of making drawn fibers available over a predetermined "delivery width” see the aforementioned DE-A-3541219
  • a twist generator which generates a false twist in the fiber structure in such a way that a wrongly twisted core and projecting edge fibers arise
  • An injector part which must be arranged between the drafting device and the swirl device in order to loop the edge fibers around the core.
  • the object of the present invention is therefore to design the above-mentioned elements in such a way that each can perform its subtask as optimally as possible without interfering with another element of the system in fulfilling its task.
  • the sliver is drawn and fanned out in the drafting system and in this state first reaches the injector part. Edge fibers are sucked in here and placed on the yarn core which has been rotated incorrectly by the twist action of the twist part.
  • the passage opening for the sliver is initially narrow and then widens in a shoulder shape.
  • an air inlet hole opens into the interior of the swirl part. In the area of the air inlet bore, the sliver does not lie against the inner wall of the swirl part.
  • the air jet that enters the interior of the swirl part through the air inlet bore thus strikes the fiber structure, which in this area is not guided laterally through the inner wall of the swirl part.
  • the air jet therefore has a very good point of attack on the fibers of the fiber structure at this point.
  • the thread part of the fiber structure that moves spirally in the interior of the swirl part and does not slide along the wall is rotated like a crank by the air flow. Due to the good point of attack according to the invention for the Air flowing into the air inlet bore produces a good swirl effect. This swirl continues up to the drafting system, where the winding fibers are provided outside the spinning triangle. This creates a narrow spinning triangle.
  • the sliver emerges from the drafting device with a width which is at least one and a half times the inside diameter of the injector nozzle. This means that the width of the fiber sliver at the drafting system outlet is wider than the spinning triangle. This targeted production of the wrapping fibers enables the finally parallel lying core fibers to be wrapped with the edge fibers and thus good yarn strength.
  • the shorter design of the twist part in comparison to the injector part enables on the one hand the optimization of the twist generation and on the other hand the even application of the edge fibers to the core (winding around the core).
  • the latter task requires, first of all, the emergence of a state which at all enables uniform winding, and then the maintenance of flow conditions and the resulting rotational movements which bring about the winding.
  • the friction on the wall of the injector part plays a positive role here.
  • twist part On the other hand, there should be as little friction of the yarn as possible on the walls of the twister because such friction prevents the twist from being generated.
  • the maximum possible delivery speed for a given wrong twist is also increased by a higher yarn speed.
  • the length of the twist part is to be selected so that the spiral can form in the yarn, which (under the effect of the air flow) represents the actual "twist generator".
  • the length of the injector part is preferably at least 30% and at most up to 100% greater than the length of the Swirl part.
  • the injector part is preferably between 30% and 60% longer than the swirl part. In the preferred embodiment, the injector part is 50% longer than the swirl part.
  • the length of the swirl part can be selected between 25 and 35 mm (preferably 30 mm).
  • the length of the injector part is preferably at least 40 irim.
  • the injector part has a substantially constant cylindrical inner diameter. This does not hinder the rotation of the thread. In addition, low frictional losses and damage to the thread are brought about.
  • the low-friction rotation of the thread in the injector part is given in particular when the enlarged inner diameter of the twist part is equal to or smaller than the inner diameter of the injector part.
  • the distance of the air inlet bore from the shoulder-shaped extension should be equal to or less than the difference between the inner radii of the swirl part and thus the shoulder height. This ensures that the air jet has a particularly good point of attack on the wrapping fibers.
  • an expanded inner diameter of the swirl part between 2.2 and 2.8 mm has been found to be particularly advantageous.
  • the air jet acting on the thread acts particularly effective.
  • the fibers are impacted by the air jet immediately after the shoulder and rotated vigorously.
  • a ratio of enlarged inner diameter to length of 1 to 6 to 1 to 16 has proven to be an advantageous length of the swirl part. With a ratio of 1 to 12 to 1 to 14, yarns of the best quality and strength can be achieved.
  • the air inlet bores arranged in the injector part are advantageously arranged at an angle of 30 ° to the axis of the injector part.
  • a good winding around the core fibers by the edge fibers is achieved if the width of the fiber sliver emerging from the drafting system is greater than the inside diameter of the injector part.
  • a width and a half of the sliver compared to the inside diameter of the injector part has been found to be particularly advantageous. In this case, the sliver is loosely fed into the air jets and can therefore be easily twisted.
  • the distance of the air inlet bore from the shoulder-shaped extension in the swirl part is less than 0.5 mm. Very good spinning results could thus be achieved.
  • FIG. 4 shows a swirl device a detail of a shoulder-shaped extension a section through the swirl part in the area of air inlet holes a side view of a suitable drafting device a view in the direction II (FIG. 4), and to Fig. 11 are diagrams for explaining the effect of the parts shown in Figures 1 and 2.
  • FIG. 1 shows a device according to the invention for spinning a fiber sliver.
  • An injector part 1 and a swirl part 2 form a pneumatic swirl device.
  • This swirl device is arranged after a pair of delivery rollers 3, 4 in the running direction of a sliver (not shown).
  • the delivery roller pair 3, 4 is the last roller pair of a drafting system, in which a delivered fiber sliver is drawn down to spinning strength.
  • the sliver comes out of the delivery rollers 3, 4 in a width which is larger than the inside diameter A of the injector part 1.
  • the sliver emerging from the delivery roller pair 3, 4 reaches an interior 12 of the injector part 1 Air flows acted upon, which reach the interior 12 through air inlet bores 10, 11.
  • the air inlet bores 10, 11 are arranged at an angle ⁇ in the injector part 1.
  • An angle of about 30 ° between the axis of the injector part 1 and the axis of the air inlet bore has proven to be advantageous. With this angle ⁇ , particularly good guidance of the future wrapping fibers is achieved.
  • the interior 12 of the injector part 1 is cylindrical.
  • the swirl part 2 is arranged at a short distance from the injector part 1.
  • the sliver is on entry led into the swirl part 2 first into a narrow point 220.
  • the constriction 220 has a diameter C which is smaller than the diameter A of the injector part 1.
  • the diameter C is not so small that the constriction 220 acts as a twist stop on the thread or can become blocked when passing through a thick point in the yarn.
  • the narrowing 220 is followed by a shoulder-shaped widening to the diameter D.
  • An advantageous diameter D has a value between 2.2 and 2.8 mm.
  • the constriction should be short in order to keep the friction of the thread on the wall of constriction 220 low.
  • air inlet bores 200, 210 are arranged, through which air flows into the interior 230.
  • the good point of attack for the air also produces a good swirl effect on the thread.
  • the thread that does not slide along the wall of the interior 230 at the location of the air inlet bores 200, 210 is rotated like a crank by the air flow. This rotation is largely propagated up to the nip point on the delivery rollers 3, 4. Because there is no twist reduction due to the constriction 220, stable spinning conditions are created which result in good yarn strength.
  • the wrapping fibers that lie around the yarn core can be generated in a targeted and controlled manner by the width of the fiber sliver emerging from the drafting device.
  • the inner fibers can be wrapped well by the outer fibers of the yarn and thus good yarn strength can be obtained.
  • the thread Due to the large inside diameter A of the injector part, the thread is fed to the twist part 2 in such a way that good rotation can take place. With that they have through the Air inlet bores 200, 210 air flows acting on the thread part have a large lever arm.
  • a particularly good way of twisting the thread has been to arrange the air inlet bores 200, 210 at right angles in their projection to the axis of the twist part 2.
  • the swirl part 2 can have a length of approximately 30 mm (between 25 and 35 mm).
  • the partial length between the air inlet openings and the outlet from the nozzle can be approximately 20 mm (between 18 and 22 mm).
  • a ratio of enlarged internal diameter D to length L of the swirl part 2 of 1: 6 to 1:16 has proven to be particularly advantageous.
  • the interior 230 can be widened conically in the thread running direction. This is indicated by the dashed line in FIG. 1.
  • the conical widening of the interior space 230 is a further measure to reduce the thread friction.
  • the injector part 11 should have a length of approximately 45 mm (between 40 and 50 mm). It is not necessary to have more than two air inlets. provide holes, and they can be arranged in the middle third of the injector part.
  • the length of the zone between the mouths of the air inlet bores and the outlet of the injector part is preferably approximately the same as the length of the free-standing part of a wrapping fiber.
  • Such a nozzle is to be placed as close as possible to the delivery roller pair of the drafting system.
  • the suction flows generated by the injector part 1 are thus able to guide the "edge fibers" (wrapping fibers) supplied by the drafting system into the nozzle.
  • the larger diameter favors this suction effect.
  • FIG. 2 shows a detail of the shoulder-shaped expansion and the arrangement of the air inlet bores 200, 210.
  • a shoulder height c results. It has been found that a particularly effective attack of the air streams on the sliver can be achieved when a distance b of the air inlet bore 210 from the shoulder-shaped enlargement is equal to or less than the difference between the inner radii of the swirl part and thus equal to or less than the shoulder height c is. 0.5 mm was determined as a particularly advantageous value for the distance b.
  • the air inlet bores 200, 210 advantageously have a diameter of approximately 0.3 mm.
  • FIG 3 shows a sketched section through the swirl part 2 in the area of the air inlet bores 200, 210.
  • the air inlet bores 200, 210 have a lateral offset d.
  • the air inlet bores 200, 210 open essentially tangentially into the interior 230.
  • the air inlet bores 10, 11 can also open into the injector part 1. Due to the lateral offset d, the air jet acts in a particularly effective manner on the thread part for rotation.
  • reference numerals 110, 120 indicate the pair of intake rollers of a drafting system.
  • a belt passes through a draft zone 13 and enters between two adjoining debris of a pair of aprons 16, 17 whose aprons 16, 17 are guided around a lower apron roller 14 or an upper apron roller 15, and deflecting bodies 18, 19 and 37, 38, respectively.
  • the main draft zone 22 of the drafting system shown is located between the pair of apron rollers 14, 15 and the delivery roller pair 20, 21.
  • a condenser 26 which is designed to be small in accordance with the available dining space, which according to FIG. 5 has a widthwise direction 4 has an elongated shape which stretches straps 16, 17 and, according to FIG. 4, is designed with its surfaces facing the delivery rollers 20, 21 to be complementary to the parts of the surfaces of the delivery rollers 20, 21 opposite it.
  • the surface of the condenser 26, which is essentially triangular in cross section, facing the straps 16, 17 is largely adapted to the shape of the guide surfaces 24, 25 of the deflection bodies 18, 19 in order to form the straps 26, 27 to form the acute wrap angles ⁇ , ß are led around.
  • the condenser 26 rests on the circumferential surface of the lower delivery roller 20, but is at a small distance 29 relative to the upper delivery roller 21. In this way it is achieved that the condenser 26, which preferably consists of low-friction plastic material, only rests on the delivery roller 20, which is generally made of metal, where it can slide with little friction, while avoiding contact with the delivery roller 21 made of rubber. This avoids unnecessary wear on the delivery top roller.
  • the counter rollers 120, 15, 21 are made of elastic material, such as rubber.
  • the minimum space between the clamping line 23 of the delivery rollers 20, 21 and the exit of the double-groove guide 16, 17, 18, 19 is thus used to accommodate the condenser according to FIGS. 4 and 5, which has a one on the input side Has funnel shape and is provided on its side facing the delivery lower roller 20 with a slot 35 open towards the delivery lower roller 20.
  • the usual suction is provided in the form of a channel 34 extending perpendicular to the axes of the rollers.
  • This drafting system is formed according to German patent application No. 4230314 dated September 10, 1992.
  • a condenser can also be provided in the pre-delay field, e.g. according to EP-A-449073 or the further development described in German Patent Application No. 4230317 dated September 10, 1992. has been described.
  • These condenser designs give good control over the width of the fiber stream emerging from the drafting system without disturbing the warping of the band.
  • the delay can also be compensated for by an apron arrangement according to EP-A-450361, a further development of this variant being described in US patent application SN 08/010265 of January 28, 1993.
  • the content of the applications mentioned is hereby included in the present application.
  • FIGS. 6 to 11 These simplified diagrams each represent only a short section of the entire spinning process, the section under consideration migrating from the "fiber delivery point" (FIG. 6) at the drafting system exit to the finished spun yarn (FIG. 11) at the exit of the twist part 2 "".
  • the diagrams are designed to explain functions. They are not true to scale (even among one another).
  • each wrapping fiber should, if possible, loop around the yarn core over the entire length available for the wrapping.
  • the ratios in the swirl part 2 are different.
  • the fiber structure is already completely wrong-turned and has a solid structure.
  • This solid structure is now transformed into a spiral by the newly entering air currents.
  • the air currents themselves form a vortex W in the swirl part 2, and energy is transferred from this vortex to the yarn spiral.
  • the rotation of this piece of yarn about the longitudinal axis of the channel produces "upstream" from the twist part the aforementioned false twist in the yarn core, which essentially propagates up to the spinning triangle on the drafting system. (Downstream from the swirl part 2, this rotation dissolves again because it is a wrong rotation - but this is not the subject of the invention and is not explained in more detail here.)
  • the spiral drive requires a certain zone where the air currents can act on the spiral. (Swirl part 2). In this zone a vortex which is as uniform as possible must form and as much energy as possible must be transferred from this vortex to the yarn piece. However, this procedure is local, because
  • the direction of rotation of the air flow in the injector part must be reversed compared to the direction of rotation in the swirl part, in order to apply the wrapping fibers provided by the drafting device to the yarn core with a direction of rotation opposite to the false twist (FIG. 10).
  • the invention is not restricted to the exemplary embodiment shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

L'invention concerne un dispositif de filage d'un ruban de fibres comportant un dispositif d'étirage et un dispositif pneumatique de torsion monté directement à la suite du dispositif d'étirage, qui comprend un élément d'injection (1) et un élément de torsion (2) qui s'y raccorde avec un espace. Le diamètre intérieur de l'élément de torsion (2) s'évase en formant un épaulement. Immédiatement après l'élargissement en forme d'épaulement du diamètre intérieur, un alésage d'admission d'air (20, 21) débouche à l'intérieur (23) de l'élément de torsion (2).
EP93915623A 1992-07-31 1993-07-29 Dispositif de filage d'un ruban de fibres Expired - Lifetime EP0606434B1 (fr)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
DE4225262 1992-07-31
DE19924225262 DE4225262A1 (de) 1992-07-31 1992-07-31 Vorrichtung zum Verspinnen eines Faserbandes
DE4230317 1992-09-10
DE4230314A DE4230314A1 (de) 1992-09-10 1992-09-10 Doppelriemchenstreckwerk einer Spinnmaschine
DE4230317A DE4230317C2 (de) 1992-09-10 1992-09-10 Doppelriemchenstreckwerk für eine Spinnmaschine
DE4230314 1992-09-10
US10265 1993-01-28
US08/010,265 US5479680A (en) 1990-04-06 1993-01-28 Sliver drafting apparatus
PCT/CH1993/000193 WO1994003662A1 (fr) 1992-07-31 1993-07-29 Dispositif de filage d'un ruban de fibres

Publications (2)

Publication Number Publication Date
EP0606434A1 true EP0606434A1 (fr) 1994-07-20
EP0606434B1 EP0606434B1 (fr) 1997-10-08

Family

ID=27435545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93915623A Expired - Lifetime EP0606434B1 (fr) 1992-07-31 1993-07-29 Dispositif de filage d'un ruban de fibres

Country Status (4)

Country Link
EP (1) EP0606434B1 (fr)
JP (1) JP3353896B2 (fr)
DE (1) DE59307501D1 (fr)
WO (1) WO1994003662A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2128251C1 (ru) * 1998-01-15 1999-03-27 Палочкин Сергей Владимирович Ровница и способ ее получения
JP4792390B2 (ja) 2004-03-29 2011-10-12 株式会社ガルファーマ 新規ガレクチン９改変体タンパク質及びその用途

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722319B2 (de) * 1977-01-10 1981-01-15 Toyo Boseki K.K., Osaka (Japan) Vorrichtung zum pneumatischen Falschdrallspinnen
JPH01162829A (ja) * 1987-12-18 1989-06-27 Mas Fab Rieter Ag 空気ジェットノズル及び該ノズルの加撚部分で回転空気層を形成する方法
EP0418694A1 (fr) * 1989-09-22 1991-03-27 Maschinenfabrik Rieter Ag Métier à filer à jet d'air avec une tuyère d'injection et une tuyère de torsion
JPH086213B2 (ja) * 1989-10-04 1996-01-24 東レエンジニアリング株式会社 空気式糸形成装置の仮撚ノズル
JPH04163325A (ja) * 1990-10-26 1992-06-08 Murata Mach Ltd 紡績装置
JP2543363Y2 (ja) * 1991-07-01 1997-08-06 村田機械株式会社 紡績用ノズル

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9403662A1 *

Also Published As

Publication number Publication date
JPH07502311A (ja) 1995-03-09
WO1994003662A1 (fr) 1994-02-17
JP3353896B2 (ja) 2002-12-03
EP0606434B1 (fr) 1997-10-08
DE59307501D1 (de) 1997-11-13

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