JP2016030887A - Method for producing air-spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which can produce an improved air-spun yarn without requiring a complicated and expensive change in an air spinning machine.SOLUTION: In a method for producing a yarn 10, two slivers 4 and 4' positioned adjacently to each other are stretched by using a draft device 5 and then supplied together to a pneumatic type twisting mechanism 6 to be drawn out from the twisting mechanism as the yarn 10. The yarn is wound to form a cross-wound package 11. As the twisting mechanism 6, an air true twisting spinning mechanism including a twist stopping device is used. Both of the slivers 4 and 4' supplied are different from each other in at least one character. First slivers 4 and 4' are supplied to the twisting mechanism 6 in such a way as to be closer to the longitudinal direction axis line of the twisting mechanism 6 than second slivers 4 and 4'.SELECTED DRAWING: Figure 2

Description

  In the present invention, two slivers located adjacent to each other are stretched by using one drafting device, then fed together to an aerodynamic twisting mechanism, pulled out as a yarn from the twisting mechanism, and wound up. The present invention relates to a method of manufacturing a yarn for forming a traverse package.

  In pneumatic spinning and in particular the Einduesenspinnverfahren, which dominates today, the sliver that advances between the outlet 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 end is wound around the spindle head formed in the conical shape of the spinning spindle using a circulating air stream and spiraled during the drawing of the yarn into the spindle. Wrap around a so-called core fiber. The core fibers together with so-called wound fibers form a new yarn, which is drawn out, monitored by a yarn clearer, and in some cases cleared and wound up.

  Yarn strength is obtained exclusively by air wrapping by wrapping of the fibers, more precisely by the tightening action of the fibers that wrap around the yarn core. For this purpose, one fiber end must move to the yarn core, whereas the other fiber end wraps around the core. Only by the firm fixation of one fiber end can the other fiber end be able to clamp the thread core.

  A majority of the fibers of the air-spun yarn are located in parallel in the yarn core, and only about 10 to 30% of the fibers are wound fibers. It must be the purpose to control the spinning process so that the winding of the fibers is as uniform as possible and always provides sufficiently wound fibers.

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

  After each two slivers guided side by side pass through the drafting device and are then divided and held by a guide element, for example a guide hopper, each sliver individually leaves the drafting device In the false twisting device. In order to prevent the sliver from forming a yarn balloon after leaving the drafting device and interfering with each other, there is a so-called selector 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 supply roller and the drawing device, and further has a suction slot on the guide surface. As a result, the edge fibers spread laterally precede, i.e., faster than the sliver core and move in the thread drawing direction, and in this state, the edge fibers are in this state based on false twisting. Wound around. In order to prevent the edge fibers spread laterally of the sliver rotating around its own axis based on false twisting from contacting each other, so-called separators are further provided between the guide surfaces of the selector. Has been placed.

  The disadvantage of this spinning machine is that a relatively large amount of fiber waste is generated. This is because in this case the fibers whose fiber ends are not sufficiently fastened to the core move away from the sliver axis and can therefore be poorly or not encased in the yarn composite formed. Because it cannot be used to reinforce the yarn. Furthermore, the assembly consisting of two false twisting devices, a selector and a separator is relatively complex and expensive since it is necessary to provide such an assembly in each spinning section.

  From Japanese Patent Application Laid-Open No. 2004-228561, an aerodynamic spinning device and spinning method are known. According to Patent Document 2, a rotating corona-shaped fiber (Fasersonne) held by an air vortex is formed before the entrance of the spindle passage. At this time, one end of the fiber is located in a corona-shaped fiber that rotates in the spindle passage, where it forms part of the yarn. However, not all fibers are captured by the yarn forming process, so some of the fibers, especially the short fibers, are brought 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 a defined point. . The location determined 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 corona shaped fibers, this is done via at least one separate fiber feed passage.

  In the second variant, the fibers can be pre-excluded from the treated fiber stream, which can then be fed into the yarn 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 constructed in this way is extremely complex in structure and thus very expensive as well.

  Patent document 3 discloses a bundled yarn comprising staple fibers and a method for producing such a yarn. In order to produce such a yarn (Garn, this concept is mistakenly used here for Zwirn), a sliver is fed into the drafting device, which is at least 2 during the drafting process. Torn into two fiber ribbons. Each fiber ribbon then forms a correspondingly twisted yarn with wound fibers (Umwindefaser), both yarns being twisted together into one twisted yarn, which is likewise wound Has fibers.

  This method also has a drawback that a relatively large amount of fiber waste is generated. Because the deflection of some fiber ends from the sliver, unrolled to wind around the yarn core, is based on the natural ventilation of the drafting roller or, for example, electrostatic field, negative pressure, blowing or mechanical This is done by the action of other external forces, such as a typical assembly.

  An aerodynamic false twist spinning method and false twist spinning apparatus capable of spinning a uniform yarn as much as possible are known based on Patent Document 4. For known methods and devices, two slivers or one sliver that is split before or during the drafting process is fed to the drafting device, at which time both slivers are defined with respect to each other. Located at a certain interval. The determined distance between the slivers is obtained by the sliver being guided by a guide hopper. 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 is at 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 circumferential surface of the rotor, and edge fibers spread from the sliver are sucked by the two perforation rows of the rotor and are entrained in advance with respect to the fiber core composite. In contrast, the fiber core composite slides at a low speed on the circumferential surface of the rotor. Both slivers rotate around their own axis based on the false twist given to both slivers and run together into the entrance opening of the false twister, the edge fibers of both slivers are bonded together And winds around the fiber formation.

  This method also has a drawback that a large amount of fiber waste, particularly short fiber waste, is generated. On the contrary, part of the fiber waste is further promoted by the rotor. This is because the fibers whose fiber ends are sufficiently large or not deep enough to reach the sliver are thereby completely dissociated from the sliver.

  Furthermore, such a false twist spinning device is complicated in structure. This is because the guide hopper must ensure that the sliver runs into the drafting device with the required spacing between each other, and the rotor also ensures that the edge fibers are in the fiber core composite. This is because it must function in a preceding manner.

  Furthermore, it is possible to influence the winding speed of the edge fiber by using the method and apparatus described in Patent Document 4, but it cannot affect the distribution amount of the wound fiber.

German Patent Application No. 4032117 European Patent Application No. 1279756 German Patent Application Publication No. 3433282 German Patent Application No. 4032941

  Therefore, it is an object of the present invention to provide a method that can produce improved pneumatic spun yarns without requiring complex and expensive changes to the pneumatic spinning machine. It is further desired that the method according to the invention can be used to influence the amount of wrapping fibers that is important for yarn strength in a yarn composite.

  According to the present invention, this problem is solved by the configuration described in the characterizing part of claim 1.

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

  In order to solve the above-mentioned problem, in the configuration according to claim 1, an air main twist spinning mechanism (Luftechtdrahtspinnorgan) having a twist-preventing device is used as the twisting mechanism, and both supplied slivers have at least one characteristic. Different from each other, the first sliver was fed to the twist mechanism closer to the longitudinal axis of the twist mechanism than the second sliver.

  In the pneumatic main-spinning mechanism, when two slivers are fed together to the drafting device and then fed to the twisting mechanism, the position of each sliver at the time of feeding is relative to the pneumatic spinning process and the yarn structure produced. It has a big influence on. It has been confirmed in experiments that when spinning air-spun yarns, the sliver fibers that run into the twisting mechanism at the center or at a position relatively close to the center will rather be located at the fiber core. . In contrast, the sliver fibers, which are fed somewhat offset from the center, are rather wound fibers and are thus located outside the air-spun yarn.

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

  The present invention also includes a special case where a sliver that runs 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, on the basis of the method according to the present invention, a plurality of different slivers can be processed into one air-spun yarn, and for the formed yarn structure, the fibers of each sliver are used as core fibers. It can have an influence on whether it is used or used as a wound fiber.

  Another advantage of the method according to the present invention is that no troublesome or expensive structural changes of the pneumatic spinning machine are required for the conversion to the method, and therefore no excessive additional cost is generated. It is done.

  As claimed in claim 2, it is preferred that the characteristic different from each other in both slivers is the average staple length of the sliver.

  A sliver with a relatively long average staple length is hardly centered upon entry into the twisting mechanism and causes the short fibers of the sliver oriented near the longitudinal axis of the twisting mechanism to flow into the air. Protect against it.

  Therefore, based on this method, only a small amount of fiber debris is generated during the pneumatic spinning process, rather than by known methods and devices based on the prior art.

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

  This is particularly effective when spinning 100% carded cotton. This is because fiber waste has traditionally had a particularly detrimental effect on economics in just such feedstocks.

  Furthermore, it is possible to influence the distribution amount of the wound fiber. This is because the arrangement of the sliver ensures that sufficient winding fibers are always used and that the fibers can be wound uniformly.

  Alternatively, as defined in claim 3, the property that is different from each other in both slivers is the fiber raw material of the sliver.

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

  For example, one sliver is made of polyester fiber and the other sliver is made of viscose fiber. For example, depending on the arrangement form of the sliver, it is possible to influence the purpose of which fiber is more manifested as a wound fiber.

  Where high wear resistance and friction fastness of the yarn are important, it is desirable that the sliver containing the polyester fiber is not located closer to the longitudinal axis of the twisting mechanism than the sliver containing the viscose fiber. As a result, in the yarn core, the characteristics of the sliver that runs more in the center, that is, the characteristics such as good moisture absorption and soft hand of the viscose fiber, are effective. On the other hand, on the outside of the yarn, the properties of the polyester, such as high durability, are very important.

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

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

  Such a change mode has an advantage that the drawn sliver can be processed by coming directly from the drawing path. This eliminates the need for an intermediate step for producing flyer roast or so-called roving from the drawn sliver. This means not only saving time, but also significant cost savings. This is because not only the production of flyer roving is omitted, but also the machine for producing the flyer roving is unnecessary.

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

  Such Flyerlunte, also called so-called roving, is no longer required to be pulled as strongly during the pneumatic spinning process as the Strechenband. The advantage of this variant is that very uniform and quality expensive yarns can be spun.

  According to the sixth aspect, each sliver has a uniform fiber mixture.

  In order to obtain the advantages obtainable by the present invention, a plurality of slivers can be used, each sliver having its own uniform fiber mixture. That is, for example, a sliver having 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 located more centrally or more eccentrically when fed to the pneumatic spinning process, the fibers can be found at the yarn core or as yarn wound fibers.

It is a front view showing a textile machine provided with an air spinning device. It is the schematic which shows one working part of an air spinning machine which supplies two sliver like this invention.

  Next, an embodiment of the present invention will be described with reference to a working section of a 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 side by side in a row, and these working parts 2 are so-called end frames 15, 16 arranged on the end side. Is positioned between.

  As further shown in FIG. 1, each working unit 2 includes a sliver 4 stored in a supply material, for example, a spinning can 3.

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

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

  The winding package or the traverse winding 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 operated operating unit 12, which is guided on rails 13,14. The vehicle can travel along the working unit 2.

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

  Two slivers 4 and 4 ′ are supplied to the draft device 5. In order to produce the yarn 10, the sliver 4 having a long average staple length is fed eccentrically to the draft device 5. A sliver 4 ′ having a short average staple length is located near the longitudinal axis of the twisting mechanism 6.

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

  After both slivers 4, 4 ′ run together into the drafting device 5, where they are stretched together, the sliver 4, 4 ′ likewise reaches the pneumatic spinning device or twisting mechanism 6 together. Short fibers run into the twisting mechanism 6 in the middle, whereas long fibers, on the other hand, run somewhat offset relative to the longitudinal axis of the twisting mechanism 6, i.e. eccentrically. .

  The yarn 10 that has advanced from the pneumatic spinning device is confirmed and drawn out using the yarn drawing device 7, monitored by the yarn clearer 8, and, in some cases, cleared. The succeeding yarn traversing device 9 winds and traverses the yarn 10 in which the yarn core is mainly composed of short fibers and the majority of the wound fibers (Umwindefaser) are formed of long fibers while traversing. A package 11 is formed.

  DESCRIPTION OF SYMBOLS 1 Air spinning machine, 2 Working part, 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, 14 rails

Claims (6)

Two slivers (4, 4 ') located adjacent to each other are stretched by using one drafting device (5) and then fed together to an aerodynamic twisting mechanism (6). A method for producing a yarn (10), wherein the yarn (10) is drawn out as a yarn (10), and the yarn (10) is wound up to form a traverse package (11),
As the twisting mechanism (6), an air main twist spinning mechanism equipped with a twist-preventing device is used, and the supplied two slivers (4, 4 ') are different from each other in at least one characteristic, and the first sliver (4, 4 ') being fed to the twisting mechanism (6) closer to the longitudinal axis of the twisting mechanism (6) than to the second sliver (4, 4') How to manufacture.   The method of claim 1, wherein the characteristics that are different from each other in the sliver are an average staple length of the sliver.   The method of claim 1, wherein the characteristics that are different from each other in the sliver are fiber raw materials.   2. The process as claimed in claim 1, wherein a stretched sliver is used as the sliver (4, 4 ').   2. The method according to claim 1, wherein flyer roving is used as the sliver (4, 4 ').   2. The method according to claim 1, wherein each sliver (4, 4 ') has a uniform fiber mixture.

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