JP6682213B2 - Method for producing air-spun yarn - Google Patents

Description

  According to the present invention, two slivers located adjacent to each other are drawn by using one draft device, and then they are supplied together to an aerodynamic twisting mechanism, drawn out from the twisting mechanism as a yarn, and the yarn is wound up. It relates to a method of manufacturing a yarn, which forms a twill package.

  In pneumatic spinning and in particular in the Einduesenspinnverfahren method, which predominates today, the sliver, which emerges between the exit rollers of the drafting device, passes through the nozzle block and reaches the inlet opening of the hollow spinning spindle. Upon entry of the sliver into the spinning spindle, the free fiber ends are wound with a circulating air stream around a conical shaped spindle head of the spinning spindle and spiraled during the drawing of the yarn into the spindle. Around the so-called core fiber. The core fibers, together with the so-called wound fibers, form a new thread, which is withdrawn, monitored by a thread clearer and optionally cleared and wound up.

  The yarn strength is obtained exclusively by the winding of the fibers in the air-spun yarn, more precisely by the tightening action of the fibers winding around the yarn core. For this purpose, one fiber end must move to the yarn core, while the other fiber end winds around the core. Only by firmly fixing one fiber end, the other fiber end can tighten the yarn core.

  The majority of the fibers of the air-spun yarn are located parallel to each other in the yarn core and only about 10-30% of the fibers are wound fibers. It must be an aim to control the spinning process so that the winding of the fibers is as uniform as possible and always sufficient winding is obtained.

  Patent Document 1 discloses a spinning machine for aerodynamic false twist spinning, in which the spinning portion is formed as a double spinning portion.

  After each two slivers guided alongside one another pass through the drafting device and are then held divided by guide elements such as guide hoppers, the slivers after each leaving the drafting device individually. Reaches the inside of the false twisting device. In order to prevent the sliver from forming a yarn balloon after exiting the drafting device and interfering with each other, a so-called selector is provided between the supply roller pair of the drafting device and the pneumatic false twisting device. It is arranged as a guide element. This selector is driven at a speed higher than the speed of the feed roller and the drawing device and also has a suction slot in the guide surface. As a result, the laterally spread edge fibers move ahead of each other, that is, faster than the core of the sliver in the yarn drawing direction, and in this state, the edge fibers move in the sliver core based on the false twist. It is wrapped around. A further so-called separator is provided between the guide surfaces of the selector in order to prevent the laterally spread edge fibers of the sliver, which rotate on their own axis on the basis of false twist, from contacting each other. It is arranged.

  The disadvantage of this spinning machine is that a relatively large amount of fiber waste is generated. Because, in this case, the fibers whose fiber ends are not sufficiently anchored in the core move away from the sliver axis and thus are poorly or not entirely encased in the formed thread complex. , It cannot be used to reinforce a thread. Furthermore, the assembly of the two false twisting devices, the selector and the separator is relatively complex and expensive as it requires the provision of such an assembly on each spinning station.

  An aerodynamic spinning device and a spinning method are known from US Pat. According to Patent Document 2, rotating corona-shaped fibers (Fasersonne) held by an air vortex are formed in front of the inlet of the spindle passage. One end of the fiber is then located in a corona-shaped fiber that rotates in the spindle channel and forms part of the yarn there. However, not all fibers are trapped by the yarn forming process, so some of the fibers, especially short fibers, are introduced into the exhaust stream.

  In order to achieve improved yarn quality and reduced (short) fiber loss, in a first variant, the fibers contained in the exhaust are captured, regenerated and returned to the spinning process at defined points. . The location established at this time may be in the central region of the corona-shaped fibers, in front of the drafting device or between the drafting device rollers. If the fibers are returned into the corona-shaped fibers, this is done via at least one separate fiber supply passage.

  In a second variant, the fibers are previously excluded from the treated fiber stream, which can then be fed to the thread-forming process in the central region of the corona-shaped fibers.

  A disadvantage of this spinning device and method described in patent document 2 is that the spinning device configured in this way is extremely complex in structure and thus also very expensive.

  US Pat. No. 6,037,058 discloses a bundled yarn with staple fibers and a method of manufacturing such a yarn. In order to produce such a yarn (this concept is mistakenly used here for a twisted yarn (Zwirn)), a sliver is fed to the drafting device, the sliver being fed at least 2 times during the drafting process. Torn into two fiber ribbons. Then from each fiber ribbon a corresponding twisted yarn with wrapping fibers (Umwindefaser) is formed, both yarns are combined by twisting into one twisted yarn, which is likewise wound. Have fibers.

  This method also has the drawback of producing a relatively large amount of fiber waste. The deflection of some fiber ends from the sliver, which is unrolled for winding on the yarn core, is based on the natural ventilation of the drafting device rollers or, for example, electrostatic fields, negative pressure effects, blowing or mechanical This is because it is performed by the action of another external force, such as a general assembly.

  An aerodynamic false-twist spinning method and false-twist spinning device capable of spinning a yarn as uniform as possible are known based on Patent Document 4. Due to the known method and device, two slivers or one sliver divided before or during the drafting process is fed to the drafting device, at the end of the stretching both slivers being established relative to each other. They are spaced apart. The defined distance between the slivers is obtained by the slivers being guided by guide hoppers. In order to influence the winding direction of the edge fibers, a so-called rotor is arranged between the supply roller pair and the false twisting device, which rotor has a higher speed than the supply roller pair and the drawing device. It is driven and has a suction slot. Both slivers run together on the circumference of the rotor, and the edge fibers that emanate from the sliver are sucked in by the two perforation rows of the rotor and are entrained ahead of the fiber core composite. Fiber-core composites, on the other hand, slide at low speeds on the rotor circumference. Both slivers rotate about their own axis based on the false twist imparted to them and run together into the inlet opening of the false twisting device, where the edge fibers of both slivers bond to each other. They wrap around and wrap around the fiber formation.

  This method also has a drawback in that a large amount of fiber waste, particularly short fiber waste, is generated. On the contrary, the rotor will further promote some of the fiber waste. This is because the fibers whose ends do not reach the sliver sufficiently large or deep enough are completely dissociated from the sliver.

  Further, such a false twist spinning device has a complicated structure. That is, the guide hopper must ensure that the slivers run into the drafting device with the required spacing between each other, and the rotor must ensure that the edge fibers are in the fiber core composite. This is because it must function as a leader.

  Furthermore, it is possible to influence the winding speed of the edge fibers by using the method and device described in Patent Document 4, but it is impossible to influence the distribution amount of the wound fibers.

German Patent Application Publication No. 4032117 European Patent Application Publication No. 1279756 German Patent Application Publication No. 3433228 German Patent Application Publication No. 4032941

  The object of the present invention is therefore to provide a method by which an improved pneumatic spun yarn can be produced without the need for complicated and expensive modifications of the pneumatic spinning machine. Furthermore, it is desired that the method according to the invention can be used to influence the distribution of the wound fibers, which is important for the yarn strength in the yarn composite.

  This problem is solved according to the invention by means of the features of claim 1.

  Preferred embodiments of the invention are described in the dependent claims.

  In order to solve the above-mentioned problems, in the structure according to claim 1, an air main twist spinning mechanism (Luftechtdrahtspinnorgan) provided with a twist preventing device is used as a twist mechanism, and both slivers supplied have at least one characteristic. Different from each other, the first sliver was adapted to feed the twisting mechanism closer to the twisting mechanism than the second sliver.

  In the air main twist spinning mechanism, when two slivers are fed together into a drafting device and then to the twisting mechanism, the position of each sliver at the time of feeding is relative to the air spinning process and the yarn structure produced. Have a big impact on It was confirmed in the experiment that when the air-spun yarn is spun, the fibers of the sliver, which enter the twisting mechanism at the center or at a position relatively close to the center, are rather located at the fiber core. . On the other hand, the fibers of the sliver, which are fed somewhat offset with respect to the center, are rather wrapping fibers and thus lie on the outside of the airspun yarn.

  According to the invention, the pneumatically spun yarn can be spun from two different slivers. At this time, whether the fiber later appears as a core fiber or a wound fiber in the yarn can be controlled by the arrangement form of both slivers at the time of entering the twisting mechanism.

  The invention also includes the special case that the sliver running in the vicinity of the longitudinal axis of the twisting mechanism is located on the longitudinal axis of the twisting mechanism.

  Among the advantages obtained by the present invention are the following: That is, based on the method according to the present invention, a plurality of different slivers can be processed into one air-spun yarn, and the fibers of each sliver are used as core fibers for the formed yarn structure. It can have an influence as to whether it is used or as a wrapping fiber.

  Another advantage of the method according to the invention is that, due to the conversion to the method, no troublesome or expensive structural modification of the air spinning machine is necessary, and thus no excessive additional cost occurs. To be

  It is preferred that the different characteristic of both slivers is the average sliver staple length.

  The sliver with a relatively long average staple length is not nearly centered on entry into the twisting mechanism and allows the sliver short fibers oriented near the longitudinal axis of the twisting mechanism to enter the air stream. Protect against.

  Therefore, on the basis of this method, less fiber waste is produced during the air-spinning process than by the methods and devices known from the prior art.

  Thus, in the method according to the invention, the placement of the fibers or sliver can influence where these fibers are located in the air-spun yarn, so that staple fibers are also economically used. Is possible.

  This is particularly effective when spinning 100% carded cotton. This is because fiber waste has hitherto had a particularly negative economic impact on just such feedstocks.

  Furthermore, it is possible to influence the distribution of the wound fibers. This is because the arrangement of the sliver ensures that always sufficient wrapping fibers are utilized and that the wrapping of the fibers can be carried out uniformly.

  Alternatively, as in claim 3, the characteristic which is different from both slivers is the fiber material of the sliver.

  In this way, air-spun yarns of different materials can be controlled and manufactured.

  For example, one sliver is made of polyester fibers and the other sliver is made of viscose fibers. For example, the configuration of the sliver can influence the purpose of which fiber is represented as more wrapped fiber.

  Where high abrasion resistance and rub fastness of the yarn are important, it is desirable that the sliver containing polyester fibers be located less near the longitudinal axis of the twisting mechanism than the sliver containing viscose fibers. As a result, in the yarn core, the properties of the sliver running at the center, that is, the properties of the viscose fiber such as good water absorption and soft hand, are effective. On the other hand, on the outside of the yarn, the properties of polyester, such as high durability, are very important.

  Of course, it is also possible within the framework of the invention for both slivers to differ in further or other characteristics.

  As described in claim 4, it is preferable to use a drawn sliver as the sliver.

  Such a variation has the advantage that the drawing sliver can be directly processed from the drawing path. This eliminates the need for an intermediate step of producing flyer roving or so-called roving from the draw sliver. This means not only time savings, but significant cost savings. This is because not only is the production of flyer roving omitted, but the machine for producing flyer roving is no longer necessary.

  However, in an alternative embodiment, it is also possible to use flyer roving as the sliver, as claimed in claim 5.

  Such Flyer lunte, also called so-called roving, no longer needs to be pulled as strongly as a draw sliver during the air spinning process. The advantage of this variant is that it is possible to spun yarn which is very uniform and of high quality.

  According to claim 6, each sliver has a homogeneous fiber mixture.

  To obtain the advantages obtainable with the invention, it is possible to use a plurality of slivers, each sliver having its own homogeneous fiber mixture. That is, for example, a sliver with a short average staple length or a long average staple length is used. Certainly the slivers used are different from each other, however, each sliver itself is uniform. Depending on which sliver is more centrally or more eccentrically located at the time of feeding to the air spinning process, the fibers can be found in the core or as wound fibers of the yarn.

It is a front view showing a textile machine provided with a pneumatic spinning device. FIG. 3 is a schematic view showing one working part of an air spinning machine, which feeds two slivers as in the present invention.

  Next, an embodiment of the present invention will be described with reference to the working unit of the pneumatic spinning machine shown in the drawings.

  FIG. 1 shows a pneumatic spinning machine 1 in a front view. This textile machine has a number of working parts or spinning parts 2 arranged in rows next to one another, these working parts 2 being so-called end frames 15, 16 arranged on the end side. Are positioned between.

  As further shown in FIG. 1, each working part 2 comprises a feed material, for example a sliver 4 stored in a spinning can 3.

  Further, the working unit 2 has a draft device 5, an air spinning device having a twisting mechanism 6, a yarn drawing device 7, a yarn clearer 8 and a winding device, respectively.

  The associated yarn traversing device 9 serves to wind the yarn 10 produced from the sliver 4 in the pneumatic spinning unit onto the winding package 11 in a traversed state.

  The take-up package or the traverse package 11 is normally held by a package frame (not shown) and is rotated by a package driving device (not shown).

  As further shown in FIG. 1, the working part 2 of the textile machine 1 is preferably managed by an automatically operating operating unit 12, which is guided on rails 13, 14. Can travel along the working unit 2.

  FIG. 2 shows one working part 2 of the pneumatic spinning machine 1 together with the supply form according to the invention of two slivers 4, 4 ′, in which sliver 4, 4 ′ is one yarn. Spins to 10.

  The draft device 5 is supplied with two slivers 4, 4 '. To produce the yarn 10, a sliver 4 with a long average staple length is eccentrically fed to a drafting device 5. The sliver 4 ′ with a short average staple length is located near the longitudinal axis of the twisting mechanism 6.

  A yarn withdrawing device 7, a yarn clearer 8 and a yarn traversing device 9 are arranged downstream of the pneumatic spinning device in the yarn traveling direction.

  After both slivers 4, 4'run into the drafting device 5 together and are stretched together there, the slivers 4, 4'also likewise reach the pneumatic spinning device or twisting mechanism 6 together. Short fibers run into the twisting mechanism 6 in the middle, whereas long fibers run differently, that is to say somewhat offset with respect to the longitudinal axis of the twisting mechanism 6, ie eccentrically. .

  The yarn 10 that has exited from the pneumatic spinning device is determined and drawn out using the yarn drawing device 7, monitored by the yarn clearer 8 and possibly cleared. The subsequent yarn traversing device 9 traverses the yarn 10 in which the yarn core is mainly composed of short fibers and most of the wound fibers (Umwindefaser) are formed of long fibers while traversing and traversing. The package 11 is formed.

  1 pneumatic spinning machine, 2 working section, 4, 4'sliver, 5 draft device, 6 twisting mechanism, 7 yarn drawing device, 8 yarn clearer, 9 yarn traversing device, 10 yarn, 11 winding package, twill winding package, 12 operation units, 13 and 14 rails

Claims (6)

Two adjacent slivers (4, 4 ') are drawn using one drafting device (5) and then fed together to an aerodynamic twisting mechanism (6), which twisting mechanism (6) A method for producing a yarn (10), which comprises pulling out a yarn (10) from a yarn and winding the yarn (10) to form a twill package (11),
As the twisting mechanism (6), an air main twist spinning mechanism equipped with a twisting prevention device is used, and the two slivers (4, 4 ') supplied are different from each other in at least one characteristic, and the first sliver is used. (4, 4 ') is closer to the first sliver (4, 4') than the second sliver (4, 4 ') and closer to the longitudinal axis of the twisting mechanism (6) . And a sliver (4, 4 ') of the above are spaced apart from each other and supplied to the twisting mechanism (6).   The method of claim 1, wherein the characteristic that differs from each other in the sliver is an average staple length of the sliver.   The method of claim 1, wherein the different properties in the sliver are fiber raw materials.   The method according to claim 1, wherein a drawn sliver is used as the sliver (4, 4 ').   The method according to claim 1, wherein flyer roving is used as the sliver (4, 4 ').   Method according to claim 1, characterized in that each sliver (4, 4 ') has a homogeneous fiber mixture.

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