FR2459305A1 - METHOD AND DEVICE FOR THE PRODUCTION OF A LOOSE SOUFFLE LOOP - Google Patents

Abstract

METHOD AND DEVICE FOR THE MANUFACTURE OF A BLOW-LOOP THREAD. THE ENDLESS WIRE HARNESSES 2, 9 DURING THEIR PASSAGE THROUGH BLOWER NOZZLE 7 ARE IN AN ABSOLUTELY TENSION-FREE STATE AND THE WIRE BLOWS AIR FLUSH LOOP FROM BLOWER NOZZLE 7 IN THE VERTICAL DIRECTION ARRIVES FROM BOTTOM IN TOP TO WINDING DEVICE 5, 15, IN THE FORM OF A LOOP OF FREE OSCILLATING WIRE.

Description

"Method and apparatus for producing a looped spun yarn". The

  The present invention relates to a process for producing a looped spun yarn from at least two bundles of endless yarns which are passed through with

  supercharging - possibly with

  different - in the substantially vertical direction

  down through a blowing nozzle driven by compressed air.

  in which they are mutually mixed with

  simultaneously with individual capillary loops, after

  wired looped wire is fed to a winding device

  arranged laterally offset from the blast nozzle, the present invention also

  for the implementation of this method.

  A process of this type is, for example, known from Japanese Patent Application 77 049 367. In this patent application, a false-twisted texture endless bundle of fibers and another multifilament yarn are mutually mixed in a blown-in nozzle. by compressed air, the capillaries of the false twisted textured end wire bundle being at least partly bonded as small loops or laces. These little loops that protrude from the

  The surface of the looped spun yarn generally helps to improve

  the appearance and feel of the fabric of the tablecloths

made from these yarns.

  The technique of manufacturing curly blown yarns, also known as air texturing, texturing

  by nozzle or texturing by blast nozzle, has constantly

  developed in recent years, and this, too

  good for texturing bundles of individual endless wires

  only for the mixing and texturing of two or more

  bunches of endless yarns, fancy yarns

  stresses that can be made by varying the speeds of supply to the blowing nozzle of different groups of son

  participating in the operation. A good overview of the state of development

  This technique is given by the articles "Entwicklung einer DUse fur das Lufttexturieren" of

  U. LIEBSCHER / K. STEGERER / G.HEBENSTREIT in Wiss.Z.d.Techn.

  Hochsch. Karl-Marx-Stadt 11 (1969), vol. 1, pages 79-93,

  "Die Texturierung von Chemiefeden im Luftstrom" by J.W.

  LUNENSCHLOSS / J.G.HELLI in TEXTIL-PRAXIS 1969, August, pages 515-520 and "Luftblastexturieren von Polyester-und anderen Filamentgarnen" by G. BREHM in chemiefasern / textil-indus-

  Sorted, June 1978, pages 552 - 558 and August 1978, pages 706-708.

  From these articles, it can be seen that, in particular, for the blast nozzle texturing of several groups of yarns exhibiting a different behavior to shrinkage and staining, what matters is the regularity of the formation of the loops (that is, to say the size and the density

  regular loops) and a good mix of these.

  The essential parameters for these characteristics are, on the one hand, the blowing pressure which, from about 8 -

  bars must be relatively high and, on the other hand,

  Thread that should not be too much. high and whose

  maximum limit is usually 300 - 400 m / min. The pressure

  Air flow and wire speed should not be too high as otherwise there is a risk of mechanical damage - especially in the case of fine capillary yarns and low tensile strength yarns. The consequence is the

formation of down.

  For the manufacture of a compound looped spun yarn

  of at least two bundles of endless threads, the present invention

  It is therefore the object of the present invention to provide a method

  despite a gentle treatment of the wire material allows a

  intensive and regular loops and an intimate mixing of these loops without being held to the high air pressures usually practiced nor limited to low speeds of wire

also practiced.

  With a process of the aforementioned type, this result is achieved according to the invention by the fact that the beams of

  endless son while crossing the culverts

  The flange is in an absolutely voltage-free state and the air-blown, blown-up looped nozzle of the blower nozzle in the vertical direction reaches from bottom to top.

  winding device in a loop of free oscillating wire

  is lying. It has been found that the individual capillaries are blown regularly and intensively only if during their passage through the nozzle they are perfectly free of tensile stress and that they are driven out of the nozzle by the jet of gas or gas. air. Only when forming a freely oscillating wire loop is an effect

  regular and faithfully reproducible. The loop of wire oscillating

  It can only be formed if the groups of spun yarns pass through the blast nozzle from top to bottom and

  from the bottom up to the winding device. The ex-

  pushing the bundles of yarns from the nozzle by the blowing fluid from bottom to top in the vertical direction or in the horizontal direction, as is known, for example, from the German patent application 1 410 415 or the British patent 828 641 because of the lack of control over the free formation of the loops and because of the formation of a folding point which then occurs, does not cause the formation of a freely oscillating wire loop more than the pulling a curled spun yarn expelled from the bottom of the blowing nozzle to the winding device in the horizontal direction or in the vertical direction from top to bottom as is known from the Japanese patent 72 15 547 or the application of Japanese patent 77 049 367. Finally, it is not necessary that the blown yarn buckled between the blowing nozzle and the device

  the winding is bent so that the curve of the wire

  feels a more or less pronounced folding point like this

  known from Japanese Patent Application 77 042 955.

  Since it is not important by what constructive measures (geometry of the nozzle, arrangement of the blow nozzle with respect to the winding device) the loop of freely oscillating wire is produced, these factors do not influence the

  operating expenses may be granted in sufficient

  exactly at a given yarn so that with high working speeds it is possible to obtain air consumption

  minimal. Thus, conventional textile yarns may be

  intensively and regularly with pressures of 3

  bars or less and winding speeds of 800 m / min or more.

  Mechanical deterioration of the yarn does not occur with this gentle treatment and the textile characteristics do not

are not affected.

  Another uniformization of the texturing effect can be obtained if the bundles of endless wires fed to the blowing nozzle are guided separated from each other until they enter this blowing nozzle.

  To give the yarn the necessary tension to

  Alternatively, the usual wire brakes may be provided below the winding device. In such a case, the looped spun yarn is preferably fed to the winding device through a device passed from basen high to

confer the tension of the thread.

  The process according to the invention is suitable for treating

  of all current yarns in the range of fine, medium and coarse titles (up to, for example, 3000 dtex for the range of decorative fabrics), yarns of different material by

  polyesters, polyamides, polyurethanes, polyesters,

  lyolefins, rayon, cellulose acetate or the like

can be mixed together.

  If more than two groups of wires are blown together, it is recommended to bring the second, the third group etc. with each time the same overeating. Which is

  essential in such cases is the separation of all groups

  Weighing until the point of blowing.

  The subject of the invention is also a device for

  the implementation of the method according to the invention.

  This device comprises, in a known manner, suppliers for the various bundles of endless wires, a blow nozzle with a wire guide channel disposed substantially

  vertically and a winding device placed

  offset from this blowing nozzle (Japanese Patent Application 77 042 955) and is characterized in that the blow nozzle comprises a wire guide channel which,

  side of the wire, has a larger section of

  than the entrance part of the wire and below the

  winding device is fitted with a

  guide surface, on the output side of the wire, is placed vertically

  below the winding device.

  The special blow nozzle provides a transport effect, that is, it blows the curled spun yarn forming to expel it from the wire guide channel perpendicularly downwardly. The return member below the winding device promotes the formation of the loop

of oscillating wire freely.

  In a preferred device, a separation tip

  wire is arranged in front of the blowing nozzle at a distance of

  about 5 to 20 mm. This separation point makes that

  the wires are blown by the air only in the direction of

  yarns and causes particularly regular loops

  -border. Without a separation point, a blowing occurs

  preliminary forming loops of irregular size. The dis-

  tance of the separation point of the blowing nozzle de-

  hangs to a large extent from its diameter.

  According to another preferred embodiment, the furnaces

  planners for the different bundles of endless wires are made in the form of

  degree of the friction roll of a winding device.

  The invention will be better understood by means of the description

  an embodiment taken as an example, but not a limitation, and illustrated by the appended drawing which represents

  schematically a preferred embodiment.

  Coming from a coil 1, an endless wire bundle 2 is fed by a wire guide 3 to the conical recess 4 'of a coupling of a friction cylinder 5. The bundle of endless wire passes twice over the detachment 4 'via a guide roller 6 and then goes to the blowing nozzle 7. From a second coil 8, a second bundle of endless wires 9 is fed by a wire guide 10 at the recess conical 4 "

  of connection 4 and, as a result of the smaller diameter of this

  4 "relative to that of the recess 4 'reaches the blowing nozzle 7 with a lower speed than the first endless wire bundle 2. The two bundles of endless wire are separated by the pointell until just before their entry in the wire guide channel 7 'of the blast nozzle 7

  which is supplied with compressed air by an "L" pipe.

  The looped spun yarn 12 forming a loop of freely oscillating thread S passes over a friction body 13 serving as a return member and tensioning device, ascends vertically upwards and reaches the spool 15 via a thread guide 14 controlling the winding tension as well as

  therefore the size of the wire slug.

  The position and shape of the oscillating wire loop freely play no role. They can also be

  during operation, see, for example, the

S '.

7

Claims (6)

  A method for producing a looped spun yarn from at least two endless bundles of threads which are passed over-feed - possibly with different feed rates - from top to bottom in the substantially vertical direction through a blowing nozzle driven by compressed air and in which they   are mutually mixed with simultaneous formation of   individual capillaries, after which the blown yarn   loop is brought to a winding device arranged   laterally with respect to the blast nozzle, characterized   This is because the bundles of endless wires during the passage of the blow-out nozzle are in an absolutely voltage-free state and the air-blown looped air-blown spun yarn of the blow nozzle in the vertical direction reaches from low to high. up to the winding device   in a freely oscillating wire loop.   2. Method according to claim 1, characterized in that the bundles of endless wires fed to the blowing nozzle are guided separately from one another to   their entry into this blowing nozzle.   3. Process according to claim 1 or 2, characterized   the fact that the looped spun yarn is brought into   positive winding via a device tensioner.   4. Device for implementing the method   according to any one of claims 1 to 3 comprising   suppliers for the different bundles of wires without   end, a blowing nozzle with wire guide channel dis-   placed substantially vertically and a winding device   positioned laterally offset from said blow nozzle, characterized in that the blow nozzle (7) has a wire guide channel (7 ') which has a larger flow section at the output side of the wire. than   on the input side of the wire and below the   bearing (5; 15) there is installed a return member (13) of which   the guide surface, which has emerged from the wire, is placed vertically   tically below the winding device (5; 15).   ,:.: -5. Device according to claim 4, characterized in that a separation point of the wires (11) is arranged in front of the blast nozzle (7) at a distance about 5 to 20 mm.   6. Device according to claim 4 or 5, characterized in that the suppliers for the various bundles of endless wires (2; 9) are made in the form of conically decreasing couplings per degree of the cylinder of   friction of a winding device (5, 15). : r ,, e L a,., h :. % "