JP6566971B2 - Method and apparatus for drawing and drawing a plurality of yarns that have just been spun - Google Patents

Description

  The present invention provides a method for drawing and stretching a plurality of freshly spun yarns according to the first part of claim 1, and a method for drawing and stretching a plurality of freshly spun yarns according to the first part of claim 7. It is related with the apparatus to do.

  When producing synthetic yarns in the melt spinning process, the freshly spun yarn is guided after cooling in an apparatus consisting of a plurality of godets with driven godet peripheral walls, preferably as one yarn group, for further processing. Is done. At this time, the godet peripheral wall of the godet has a configuration in which it is heated or not heated in order to draw out the yarn after spinning, to stretch and relax the yarn. In the prior art, especially when producing fully drawn yarns (FDY), two different methods and apparatuses are known for drawing and drawing spun yarns.

  For example, in the first form known from DE 199 58 245 A1 (DE 199 58 245 A1), a plurality of yarns are wound together several times and guided in one godet unit. . The godet unit has at least one driven godet peripheral wall and a free-rotating corresponding guide roller (Ueberlaufrolle), whereby the yarn is guided around the godet peripheral wall and the corresponding guide roller by being wound a plurality of times. be able to. For example, to carry out intensive heat treatment on the yarn, the godet unit is preferably operated with two heated godet peripheral walls. Such a godet unit thus requires a long projecting godet peripheral wall, which generates a considerable associated air flow that cannot be ignored based on a relatively large peripheral surface. Thus, in such a method and apparatus, it is known that a shielding metal thin plate is disposed between the godet peripheral walls of the godet unit in order to shield the yarn winding portion in the godet unit from the accompanying air.

  In particular, in another method and apparatus known today for energy saving, the yarn is guided partially wrapped around a plurality of driven godet walls. Such a method and such a device are known, for example, on the basis of WO 2013/020866 (WO 2013/020866 A1). This method and this device are based on the fact that the yarn is drawn, drawn and relaxed after spinning, with little or no wetting. Therefore, a plurality of yarns are guided together as one yarn group with partial winding of less than 360 ° around the driven godet peripheral wall. For this purpose, the godet peripheral wall may be formed as a heating type or a non-heating type. At this time, the protruding length of the godet peripheral wall is substantially determined only by the number of yarns and the yarn interval. Therefore, an extremely compact godet peripheral wall having a relatively small peripheral surface can be realized.

  The present invention starts from this method and this apparatus. In actual use, stable yarn travel around the godet wall is particularly important in order to be able to carry out the desired heat treatment on the filament strand of the yarn each time even with a short contact length with the godet wall. It has been found. For example, it is particularly important that the yarn with each one uniform filament composite can run along the surface of the godet peripheral wall. It has been found that even a small air flow acting on the yarn affects each filament composite of the yarn.

  The object of the present invention is to improve the method and apparatus for drawing and drawing a plurality of freshly spun yarns of the type mentioned at the outset, in particular with high uniformity and stability when guiding the yarn around the circumference of the godet. It is to be guaranteed.

  This object is achieved according to the invention by a method with the features of claim 1 and an apparatus with the features of claim 7.

  Further preferred embodiments of the invention are specified by the features and combinations of features of the respective dependent claims.

  According to the present invention, the guide section that freely guides the yarn formed between the two godet peripheral walls adjacent to each other is substantially not affected by the outside, and in particular, the rotation of the godet peripheral wall inevitably It is outstanding by not being affected by the accompanying air. For this purpose, the accompanying airflow generated by the godet peripheral walls adjacent to each other is kept away from the yarn guided between the godet peripheral walls.

  For this purpose, the device according to the present invention has a shielding metal thin plate for shielding the yarn guide portion between two godet peripheral walls adjacent to each other, and this shielding metal thin plate is located between the axial centers of the godet peripheral walls. Crosses the connection line at. This makes it possible to use the corresponding inclination of the shielding metal sheet in connection with the respective thread guides of the S guide or the Z guide.

  At this time, the yarn is preferably guided at short intervals with respect to the shielding metal sheet according to a preferred method aspect. In this case, since parallel guidance is desired, the yarn is guided by the shielding metal sheet in the range of 2 mm to 20 mm. What is important at this time is to include the yarn running portion from the godet peripheral wall and the yarn running portion to the adjacent godet peripheral wall as much as possible in the shielding portion.

  Therefore, in another aspect provided by the apparatus according to the present invention, the intrusion side end of the shielding metal thin plate is held at a side interval beside the godet peripheral wall of the godet arranged on the upstream side, and The running-side end portion of the shielding metal thin plate is held at an end interval in front of the godet peripheral wall of the godet disposed on the downstream side. If comprised in this way, an accompanying airflow can be kept away from the thread | yarn guide part between godets also in the vicinity region of a godet peripheral wall.

  Depending on the godet arrangement and the characteristics of the free space required for setting the thread, the device according to the invention preferably has a side spacing in the range of 2 mm to 20 mm between the godet peripheral wall and the shielding metal sheet. It is configured.

  Furthermore, the running yarn is shielded until just before the yarn is picked up on the surface of the godet. At this time, the end portion interval between the godet peripheral wall and the shielding metal thin plate is in the range of 1 mm to 10 mm.

  In the heated godet peripheral wall, the godet peripheral wall is normally disposed in the godet box while being insulated from the surroundings. However, such a godet box basically has the disadvantage that the mutual accompanying airflow becomes partially stronger inside the godet box and causes turbulence. Thus, in a particularly preferred manner of the method, the accompanying air flow generated inside the godet box by the godet peripheral wall is collected in one or more free spaces inside the godet box. Such free space can preferably be used to calm the air flow generated inside the godet box.

  Therefore, in another aspect of the apparatus according to the present invention, a godet box for insulating several godet peripheral walls is provided, and the godet box has a free space at least near the godet peripheral wall. Such free space certainly increases the godet box, but has the advantage of uniforming the air flow inside. Such a free space further promotes the uniformity of the indoor environment of the godet box.

  In order to avoid the influence of the entrained air when the yarn has already entered into and out of the godet box, the yarn preferably enters in the region of the inlet opening of the godet box. It is guided using a sheet metal and a running sheet metal in the region of the exit opening of the godet box.

  In a particularly preferred method embodiment, the drawn yarn is guided by partial wrapping around a plurality of heated godet peripheral walls for the shrinking treatment, wherein the accompanying airflow of the godet peripheral walls is at least another shielding metal. The thin plate moves away from the freely guided thread. Just during the shrinking process, the yarn is guided around the godet peripheral wall with as little yarn tension as possible and thus with as little yarn speed difference as possible. It can be significantly improved. Further, the shrinking process is usually performed at a drawing speed which is the highest peripheral speed in the godet system.

  When drawing, drawing and relaxing synthetic yarns, different godet peripheral walls are used, heated or unheated, so it is also possible to arrange such godet peripheral walls in a multi-part godet box. . At this time, the yarn is guided using a through hole between the godet boxes. In order to prevent unwanted associated air from acting on the yarn, especially during transition between godet boxes, the device according to the invention preferably has a through-opening when a plurality of godet boxes are provided. Further, at least one guide metal thin plate that shields the yarn guide portion is arranged correspondingly, and the guide metal thin plate is configured to penetrate the through-hole. If comprised in this way, the reliable guide from the adjacent godet box can be achieved also in the thread | yarn transition part between godets.

  The method according to the invention will now be described in detail by means of some embodiments of the device according to the invention with reference to the accompanying drawings.

1 is a front view schematically showing a first embodiment of an apparatus according to the present invention. FIG. 2 is a side view schematically showing the embodiment shown in FIG. 1. FIG. 6 schematically shows another embodiment of the device according to the invention.

  1 and 2 are schematic views of a first embodiment of an apparatus for drawing and drawing a plurality of yarns that have just been spun according to the present invention as seen from a plurality of directions. 1 is a front view of the first embodiment, and FIG. 2 is a side view of the first embodiment. Unless reference is made specifically to one of the drawings, the following description is for both drawings.

  The first embodiment has a total of four godets 1.1, 1.2, 1.3, and 1.4, and these godets 1.1, 1.2, 1.3, and 1.4. Are arranged side by side on one yarn path and are held on the front side of the mounting wall 5 via one godet flange 3.1, 3.2, 3.3, 3.4. The godets 1.1 to 1.4 have projecting godet peripheral walls 2.1 to 2.4, respectively, and these godet peripheral walls 2.1 to 2.4 are each one godet motor via a drive shaft. It is connected to.

  FIG. 2 shows godet motors 4.1, 4.2, and 4.3. These godet motors 4.1, 4.2, and 4.3 are godet peripheral walls 2.1, 2 and 2, respectively, arranged correspondingly. Drives .2, 2.3.

  The godets 1.1 to 1.4 have separate heating means for heating the godet peripheral walls 2.1 to 2.4. At this time, the surface temperature may be different depending on requirements and yarn processing. For example, the temperature in the range of 40 ° C to 200 ° C can be adjusted.

  Since the godet motors 4.1 to 4.4 are alternately formed by one left rotation motor and one right rotation motor, the godet peripheral walls 2.1 and 2.2 adjacent to each other can be driven in the reverse rotation direction. It is. As a result, a plurality of yarns drawn from the spinning process can be guided as a single yarn group 7 by being partially wound around the godet peripheral walls 2.1 to 2.4. Depending on the arrangement of the godet peripheral walls 2.1 to 2.4, partial wrapping in the range of less than 360 °, preferably in the range of 180 ° to 270 ° may cause the yarn around the godet peripheral wall 2.1 to 2.4 Obtained for guidance.

  A first shielding metal sheet 6.1 is arranged at the yarn transition between the first godet peripheral wall 2.1 and the second godet peripheral wall 2.2 of both godets 1.1, 1.2. ing. The shielding metal thin plate 6.1 is tilted and held between the godet peripheral walls 2.1 and 2.2 so as to intersect with a connection line connecting the axis centers of the godet peripheral walls 2.1 and 2.2. . Such a situation is shown schematically in FIG. The axis center is indicated by 9 and the connection line is indicated by 8. This slanted arrangement of the shielding sheet metal 6.1 between the two godet walls 2.1, 2.2 is a non-contact of the thread 7 stretched between the godet walls 2.1, 2.2. Allows formula guidance and shielding.

  In the embodiment shown in FIG. 1, the run-in end 10 of the shielding metal thin plate 6.1 is arranged near the side of the godet peripheral wall 2.1. The shielding metal sheet 6.1 is held at a side interval near the godet peripheral wall 2.1 of the godet 1.1. This side spacing is indicated by B in FIG.

  The run-out side end portion 11 located on the opposite side of the shielding metal thin plate 6.1 extends to immediately before the godet peripheral wall 2.2 of the adjacent godet 1.2. An end portion interval is formed between the run-out side end portion 11 of the shielding metal thin plate 6.1 and the godet peripheral wall 2.2, and this end portion interval is indicated by a symbol A in FIG.

  Between the entrance side end 10 and the exit side end 11, the shielding metal thin plate 6.1 is formed straight and thereby extends between the godet peripheral walls 2.1 and 2.2. The yarn guide section is almost covered. In the present embodiment, the yarn 7 is guided in parallel with the shielding metal thin plate 6.1 at a short interval. The yarn interval between the yarn 7 and the shielding metal sheet 6.1 is substantially the same as the side interval B. Depending on the process and thread type, the side spacing B can be adjusted and this side spacing B is in the range of 2-20 mm.

  In particular, in order to shield the yarn supply path in the godet peripheral wall 2.2 arranged on the downstream side, the end interval A between the run-out side end 11 of the shielding metal thin plate 6.1 and the godet peripheral wall 2.2. Is adjusted to a value between 1 mm and 10 mm.

  The shielding metal thin plate 6.1 has a bent portion provided with an extension 20 at the run-in side end 10. The extension 20 protrudes beyond the guide section, and the godet peripheral wall 2.1. The flow of the accompanying airflow generated around the is changed.

  As with the shielding metal thin plate 6.1, another shielding metal thin plate 6.2, 6.3 is provided between the godet peripheral wall 2.2, 2.3 and the godet peripheral wall 2.3, 2.4. Yes. These shielding metal thin plates 6.2, 6.3 are also almost the same as the entire guide section of the yarn stretched between the godet peripheral walls 2.2, 2.3 and between the godet peripheral walls 2.3, 2.4. It extends over. Accordingly, each of the shielding metal thin plates 6.2 and 6.3 has a running-side end 10 and a running-side end 11 configured in the same manner as in the shielding metal thin plate 6.1. Therefore, further description of the shielding metal thin plates 6.2, 6.3 is omitted here.

  The shielding metal thin plates 6.1 to 6.3 are arranged on the mounting wall 5 so as to protrude and extend parallel to the godet peripheral walls 2.1 to 2.4. At this time, the shielding metal thin plates 6. 1 to 6.3 extend almost to the protruding end of the godet peripheral wall 2.1 to 2.4.

  In the apparatus shown in FIGS. 1 and 2, a total of four yarns are drawn out as a single yarn group 7 from a spinning device not shown here. At this time, another drawing means (not shown) may be further provided on the upstream side of the first godet peripheral wall 2.1. The yarn is received as a thread group 7 around the godet peripheral wall 2.1, wound around the godet peripheral wall 2.1 by partial winding, and then the yarn is taken over by the second godet peripheral wall 2.2. This second godet peripheral wall 2.2 is driven at a relatively high peripheral speed in order to draw the yarn between the godet peripheral walls 2.1, 2.2. However, basically, it is also possible to operate the godet peripheral walls 2.1, 2.2 at substantially equal peripheral speeds and to perform the stretching between the godet peripheral walls 2.2, 2.3. The godet peripheral walls 2.3 and 2.4 are operated at substantially equal peripheral speeds, whereby a contraction treatment can be performed on the drawn yarn. At this time, the peripheral speed of the godet peripheral walls 2.3 and 2.4 is in a range exceeding 4000 m / min.

  The associated airflow generated by the peripheral speed of the godet peripheral wall 2.1 to 2.4 during operation is caused by the shielding metal thin plates 6.1, 6.2, 6.3 from each thread guide region of the thread between the godets. Be kept away. This prevents unwanted air flow in the yarn guided between the godet circumferential walls 2.1-2.4. The yarn can run out of and into the godet wall with high uniformity. The associated airflow acting during yarn run-in and run-in is likewise reduced to a minimum.

  FIG. 3 shows a front view of another embodiment of an apparatus for drawing and stretching synthetic yarns according to the present invention. Since this embodiment is almost the same as the above-described embodiment shown in FIG. 1, only the differences will be described here, and the other points will be referred to the above description.

  The godets 1.1 to 1.4 are shielded against the surroundings with respect to the godet peripheral walls 2.1 to 2.4. For this purpose, the godet wall wall 2.1 of the godet 1.1 is arranged in the first godet box 12.1, and the godet wall walls 2.2 to 2.4 are arranged in the second godet box 12.2. At this time, the godet box 12.2 has a heat insulator 13 with respect to the surroundings. The godet boxes 12.1, 12.2 form one unit and are connected to each other via a through-hole 15 for yarn guidance.

  For yarn guidance, the godet box 12.1 further has a slit-shaped inlet opening 14 on the upper side and the godet box 12.2 has a slit-shaped outlet opening 16 on the lower side. In order to protect the yarn group entering the godet box 12.1 against the air flow existing inside the godet box 12.1 when already entered, the godet box 12.1 The run-in metal thin plate 17 is correspondingly arranged in the interior. The run-in metal sheet 17 has a free end 23 that ends in front of the godet peripheral wall 2.1 with a short distance. The distance between the end 23 of the intrusion metal sheet 17 and the godet peripheral wall 2.1 is preferably adjusted in the same manner as the end distance A. In this way, the entry portion and the climbing portion of the yarn group 7 around the godet peripheral wall 2.1 are shielded against possible accompanying airflow.

  Inside the godet box 12.2, a run-out metal thin plate 18 is arranged correspondingly to the outlet opening 16, and the free end 24 of the run-out metal thin plate 18 is adjacent to the godet peripheral wall 2.4 with a side interval. Is retained. The running metal sheet 18 extends substantially over the projecting length of the godet peripheral wall 2.4 to form a yarn guide section, whereby the yarn 7 running from the godet peripheral wall 2.4 is brought into the internal air flow. On the other hand, it can be shielded with a slight gap. The side interval between the starting metal sheet 18 and the godet peripheral wall 2.4 is the same as the side interval B shown in FIG. 1 and is in the range of 5 mm to 20 mm.

  In this embodiment, the running metal sheet 18 has a bent guide edge 22 outside the yarn guide region, and this guide edge 22 extends to the wall of the godet box 12.2. With the guide edge 22 in the starting metal sheet 18, the accompanying air flow generated by the godet peripheral wall 2.4 is guided to the free space 21.1 on the upper side of the godet box 12.2. The free space 21.1 formed inside the godet box 12.2 acts to absorb or buffer the accompanying airflow, thereby avoiding turbulent flow that may occur inside the godet box 12.2. can do. At this time, the accompanying airflow of the godet peripheral walls 2.2 and 2.4 is substantially absorbed. A shielding metal thin plate 6.2 is provided between the godet circumferential walls 2.2 and 2.3 for shielding and guiding the accompanying airflow in the godet circumferential wall 2.2. The extension 20 outside the guiding area redirects the accompanying airflow toward the free space 21.1. The structure of the shielding metal thin plate 6.2 between the godet peripheral walls 2.2 and 2.3 is substantially the same as that of the embodiment shown in FIG.

  In the inside of the godet box 12.2, another free space 21.2 is formed on the side opposite to the free space 21.1, immediately below the godet peripheral wall 2.3. By means of the extension 20 formed in the shielding metal sheet 6.3 extending towards the wall of the godet box 12.2, the associated airflow in the godet peripheral wall 2.3 is diverted into the free space 21.2. . The shielding metal thin plate 6.3 disposed between the godet peripheral walls 2.3 and 2.4 is the same as that of the embodiment shown in FIG. 1 and will not be described further here.

  A through hole 15 is provided for guiding the yarn between the godet boxes 12.1, 12.2. In particular, a guide metal thin plate extending through the through-hole 15 between the godet peripheral walls 2.1 and 2.2 in order to prevent an undesirable air flow action from occurring in the yarn when entering and advancing through the through-hole 15. 19 is arranged. This guide metal thin plate 19 has one entry side end portion 10 and a discharge side end portion 11, as in the case of the shielding metal thin plate. At this time, the distance between the end portion of the guide metal thin plate 19 and the godet peripheral wall 2.1, 2.2 is substantially the same as the end portion interval A and the side portion interval B of the embodiment described in FIG. At this time, the guide metal thin plate 19 extends over the yarn guide width equal to the opening width of the through hole 15.

  In principle, however, it is also possible to divide the guide metal sheet 19 into two parts, in which case the first part shields and guides the yarn guide section inside the godet box 12.1. A second portion of the metal sheet 19 disposed downstream in the yarn path shields the yarn guide portion in the godet box 12.2.

  In the embodiment shown in FIG. 3, the yarn is guided along the circumference of the godet peripheral wall through the godet box 12.1, 12.2 without substantial influence by the air flow. Thereby, in particular, the heat treatment carried out on the filament strand of the yarn can be carried out with high uniformity on the basis of a very stable yarn runway.

  In order to withdraw the yarn 7 from a spinning device not shown here, outside the godet box 12.1, upstream of the first godet 1.1 there are two separate godets 1.5,1. .6 is arranged. The godets 1.5 and 1.6 have unheated godet peripheral walls 2.5 and 2.6, respectively, which have a relatively small diameter. The godet peripheral walls 2.5, 2.6 can be preloaded in order to obtain a strong contact already around the godet peripheral wall 2.1. Thus, the arrangement of the godets 1.1 to 1.6 shown in FIG. 3 is particularly suitable for drawing a plurality of yarns together as one yarn group from the spinning device, drawing and relaxing. By shielding the yarn section that is freely guided between the godet peripheral walls, a uniform treatment over the yarn group is possible for each yarn. For example, the method according to the invention and the device according to the invention are particularly suitable for processing a plurality of yarns simultaneously.

  In the embodiment shown in FIGS. 1 and 3, the shielding metal sheet is disposed on one side of the yarn path between the godets. In order to further enhance the shielding effect, it is possible to adopt a mode in which two shielding metal thin plates are arranged side by side. When configured in this way, a guide passage can be formed between the godets. The yarn group is guided between the shielding metal sheets in the guide passage and is shielded from the surroundings on the two sides. At this time, the second shielding metal thin plate is held at a side interval near the yarn landing point in the godet arranged on the downstream side and at an end interval with respect to the godet peripheral wall of the godet arranged on the upstream side. Is done.

  The embodiment shown in FIGS. 1 and 3 shows a shielding sheet metal with a smooth and flat guiding surface. In order to influence the accompanying airflow in the yarn group, the shielding block is formed with a perforated guide surface, for example as a perforated sheet metal, or the shielding block is formed with a profiled guide surface Is also possible. The guide profile forming part can preferably be formed by a longitudinal groove, and at this time, the longitudinal groove on the guide surface is arranged corresponding to each thread of the yarn group. This can further improve the shielding effect on individual yarns of the yarn group.

  The formation of guide passages or deformed guide surfaces is possible, in particular, during the construction and improvement of the run-in metal sheet in the yarn run-in part of the godet box and the run-out metal sheet in the yarn run-out part of the godet box. For example, it is also possible to arrange two incoming metal sheets or two outgoing metal sheets so as to be located facing one guide path.

Claims (11)

A method of drawing and stretching a plurality of yarns that have just been spun, and guiding the plurality of yarns together as one yarn group around a plurality of driven godet peripheral walls, and the yarns to the godet peripheral walls A method in which the godet peripheral walls that are in contact with each other by partial wrapping of less than 360 ° and are adjacent to each other are drivable in opposite directions of rotation and guide the yarn freely between the godet peripheral walls,
The accompanying airflow generated by the godet peripheral walls adjacent to each other is kept away from the yarn that is guided freely between the godet peripheral walls , and at that time, the yarn between the godet peripheral walls adjacent to each other is shielded from the thin metal sheet. The guide plate is guided along the shielding metal sheet with an interval in the range of 2 mm to 20 mm, and the shielding metal sheet intersects a connection line between the axial centers of the godet peripheral walls. A method of drawing out and stretching a plurality of freshly threaded yarns. Wherein said accompanying airstream which is caused by the godet wall inside the godet box, leading to the free space in the interior of the godet box, the process of claim 1. When the yarn enters the godet box and / or runs out of the godet box, the yarn is spaced from each of the entering metal sheet and / or the running metal sheet in a range of 2 mm to 20 mm. 3. A method according to claim 2 , wherein guidance is provided. The stretched yarn is guided by partial wrapping around a plurality of heated godet peripheral walls for the shrinkage treatment, and at this time, the air accompanying the godet peripheral walls is freely transferred by at least another shielding metal thin plate. 4. A method as claimed in any one of claims 1 to 3 , wherein the method moves away from the yarn being guided. An apparatus for drawing and stretching a plurality of yarns that have just been spun,
A plurality of godets (1.1 to 1.4) are provided. In the godet peripheral wall (2.1 to 2.4) that can be driven by the godet (1.1 to 1.4), the yarn is 1 In an apparatus guided as a single thread group (7) with a partial winding of less than 360 °,
Between the two godet peripheral walls (2.1, 2.2) adjacent to each other, a shielding metal thin plate (6.1) for shielding the yarn guide portion is disposed, and the shielding metal thin plate (6.1) ) Intersects the connecting line (8) between the axial centers (9) of the godet peripheral wall (2.1, 2.2) ,
The entrance end (10) of the shielding metal thin plate (6.1) has a side interval (B) near the godet peripheral wall (2.1) of the godet (1.1) arranged on the upstream side. ) And the run-out side end (11) of the shielding metal thin plate (6.1) is disposed on the godet peripheral wall (2.2) of the godet (1.2) disposed on the downstream side. It is held with an end interval (A) in front,
The side interval (B) between the godet peripheral wall (2.1) of the godet (1.1) disposed on the upstream side and the shielding metal thin plate (6.1) is in a range of 2 mm to 20 mm. device for the drawer and stretching a plurality of yarn just been that, spinning lies in the. The end gap (A) between the godet peripheral wall (2.2) of the godet (1.2) arranged on the downstream side and the shielding metal thin plate (6.1) is in a range of 1 mm to 10 mm. 6. The apparatus of claim 5 , wherein: A godet box (12.2) that insulates several godet peripheral walls (2.2 to 2.4) is provided, and the godet box (12.2) includes at least the godet peripheral wall (2.2). The device according to claim 5 or 6 , comprising a free space (21.1) next to ~ 2.4). The godet box (12.1, 12.2) is formed with at least one yarn inlet opening (14) and a yarn outlet opening (16). At this time, the yarn inlet opening (14) Are arranged in the godet box (12.1) correspondingly to a thin metal plate (17) that shields the yarn guide, and the yarn outlet opening (16) has the godet box ( 8. The device according to claim 7 , wherein a running metal sheet (18) that shields the yarn guide is arranged in the interior of 12.2). The run-in metal thin plate (17) has a free end (23) inside the godet box (12.1), and the free end (23) is an end in the range of 1 mm to 10 mm. 9. The device according to claim 8 , wherein the device extends to the godet peripheral wall (2.1) arranged corresponding to the yarn entry portion with a part interval. The protruding metal sheet (18) has a free end (24) inside the godet box (12.2), and the free end (24) is a side portion in the range of 5 mm to 20 mm. 9. The device according to claim 8 , wherein the device extends beside the godet peripheral wall (2.4) arranged corresponding to the yarn running portion with a distance. The plurality of godet peripheral walls (2.1 to 2.4) are distributed and arranged in the plurality of godet boxes (12.1, 12.2), and a thread guide portion is provided in one through hole (15). at least one guide metal sheet (19) is associated arranged apparatus according to any one of claims 5 to 10 for shielding.

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