JP6588012B2 - Method and apparatus for producing fully drawn synthetic yarn - Google Patents

Description

  The present invention provides a method for producing a fully drawn synthetic yarn by drawing and relaxing a plurality of freshly spun yarns described in the front part of claim 1, and a front part of claim 8. The invention relates to an apparatus for producing fully drawn synthetic yarns by drawing and relaxing a plurality of freshly spun yarns.

  In the case of producing synthetic yarns in the melt spinning process, the newly spun yarns are, after cooling, for further processing, preferably as a single yarn group, in a plurality of godet devices with driven guide walls. Guided. At this time, the godet peripheral wall of the godet may be configured to be heated or not heated in order to draw out the yarn after spinning, to stretch and to relax the yarn. Particularly in the production of fully drawn yarn (FDY), in the prior art, a method and an apparatus for drawing out and drawing a spun yarn are known, and in this known method and apparatus, a group of yarns is partially formed on the surface of a godet peripheral wall. Wound around and guided. As a result, it is possible to avoid a godet peripheral wall that is long and protrudes a plurality of times, and as a result, little energy is required to heat the godet peripheral wall.

  Such a method and such a device are known, for example, on the basis of WO 2013/020866. This known method and known apparatus is based on the fact that the yarn is drawn out, drawn and relaxed after spinning without being wetted or slightly wetted. Therefore, a plurality of yarns are guided together as a single yarn group with a partial winding of less than 360 ° around the driven peripheral wall. The godet peripheral wall is configured to be heatable for stretching and relaxation. At this time, the protruding length of the godet peripheral wall is mainly determined 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.

  For the quality of the fully drawn yarn produced, the so-called dyeability of the fibers in the subsequent process is used as a measure. For example, during further processing into a woven fabric, it is necessary that non-uniformity does not occur during dyeing. However, the colorability of the yarn requires that each filament contained in the yarn has an equal absorption capacity for the colored pigment. Therefore, when producing a fully drawn yarn, the uniform drawing of all the filaments within one yarn group has great significance. Even small differences already at the time of release of the drawing point inside the yarn group adversely affect the uniform coloration of the yarn. However, such non-uniformity during the drawing of the yarn depends on the yarn count, at which time the production of fine yarn is particularly sensitive.

  Therefore, the object of the present invention is to improve the method and apparatus as described at the beginning, enabling high-quality coloring in each yarn during the production of the yarn group, irrespective of the yarn count, possible It is to produce the same physical characteristics as much as possible.

  Another object of the present invention is to improve the method and apparatus as described at the outset so that a stable yarn guide and yarn treatment is possible for both dry and wet yarns. It is to be.

  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 8.

  Preferred embodiments of the invention are determined by the features and combinations of features of the respective dependent claims.

  The present invention is based on the recognition that the formation of drawing points during drawing of thermoplastic fibers is strongly related to temperature. The higher the drawing temperature is selected, the greater the spread of the drawing point inside the fiber. However, it is only possible with difficulty to control and adjust such a relatively large flow transition within the fiber group. However, cold drawing is almost impossible based on the yarn guide by one partial winding on the surface of the godet peripheral wall. Therefore, the present invention utilizes a low temperature range that has a great influence on the stabilization of the drawing point for drawing the yarn. For this purpose, the yarn is guided and stretched in a free tension section between the godet peripheral wall heated to the first relatively low temperature and the second godet peripheral wall heated to the second relatively high temperature, at which time Is pretreated with heat at the surface temperature of the first godet peripheral wall at 40 ° C. to 80 ° C. before stretching. However, in connection with polymer types, it is also possible to achieve lower temperatures, in which case the yarn is alternatively guided at room temperature before drawing.

  The device according to the invention thereby provides the following special advantages. That is, in the apparatus according to the present invention, the complete stretching of the yarn can already be performed between the first godet peripheral wall and the second godet peripheral wall. At this time, the first godet peripheral wall is separated by a separate heating means. , Configured to be heatable to a surface temperature of 40 ° C. to 80 ° C., or alternatively, configured to be non-heatable. Such low temperature drawing also allows for the production of very fine filament counts that can achieve quality-quality coloring in further processing.

  When drawing, the relatively high peripheral speed of the godet causes a very strong air flow around the godet peripheral wall, so that the yarn is in the range of 150 mm to 350 mm for drawing in order to stabilize the running of the yarn. It is guided in a free tension section having a free thread length. It has been found that the yarn is hardly vibrationally excited by the air flow at a strained yarn length in the range below 350 mm. For the first time in a longer tension section, the influence of drag air on the godet surface causes yarn group vibrations that adversely affect the stabilization of the drawing point.

  In order to adjust such a free yarn length in the tension section, in the device according to the present invention, the stretching interval between the first godet peripheral wall and the second godet peripheral wall is a value in the range of 40 mm to 200 mm. Is limited to.

  In particular, in order to remove internal stress in the molecular chain of the filament strand that occurs during cold drawing, the yarn is further in a first free relaxation zone between the second godet peripheral wall and the third godet peripheral wall, And guided and relaxed between the third godet peripheral wall and the fourth godet peripheral wall in a second free relaxation zone, wherein the yarn is one each in the range of 100 mm to 200 mm in the relaxation zone. Guided with free thread length. This makes it possible to use a relatively long residence time for heat treating other yarns and extinguishing internal stresses in other yarns, even at high peripheral speeds of 4000-5000 m / min godet circumference. . The relatively short free yarn length in the relaxation zone further promotes uniform temperature regulation of the yarn.

  In order to perform such post-processing in the yarn group, a first relaxation section is formed between the second godet peripheral wall and the third godet peripheral wall, and the third godet peripheral wall and the second godet peripheral wall A second relaxation section is formed between the four godet peripheral walls, and the relaxation section between the godet peripheral walls adjacent to each other has a maximum value of 150 mm. This provides a very compact godet arrangement for post-processing the fully drawn yarn with heat.

  At this time, the relaxation sections between the godet peripheral walls may be formed to have the same size or different sizes.

  In the method according to the present invention, the heat treatment for relaxing the yarn is preferably carried out in a plurality of stages, wherein each godet peripheral wall is heated at a surface temperature in the range of 100 ° C. to 250 ° C.

  In order to obtain as fast and constant temperature adjustment of the filament strands within the yarn as possible after drawing the yarn, in a preferred variant of the method, the yarn is between the second godet peripheral wall and the third godet peripheral wall. In the first free relaxation zone, it is guided with the yarn tension generated by the speed difference. The yarn stress in the first free relaxation zone is chosen so that the filament strand of the yarn is guided in contact with the surface of the godet peripheral wall as much as possible in the form of a belt. Such yarn stress can already occur at low speed differences of 50 to 400 m / min.

  In a preferred variant of the method that promotes the disappearance of internal stresses inside the filament strand of the yarn, the yarn is very low in the second relaxation zone between the third and fourth godet peripheral walls. Guided by tension. For example, the third godet peripheral wall and the fourth godet peripheral wall are preferably operated without a speed difference.

  In another preferred embodiment, which further improves internal stress dissipation in the yarn, the yarn is guided after relaxation by delivery of a fourth godet peripheral wall to the subsequent godet and / or winder. This makes it possible to produce a fully drawn yarn with little shrinkage.

  The heat treatment during the relaxation of the yarn is mainly determined by the contact between the yarn and the surface of the godet peripheral wall. At this time, the apparatus according to the present invention is preferably configured such that the diameter of the godet peripheral wall of the godet is formed to have an equal size for heat treatment of the yarn.

  In order to prevent the mutual influence of the heat treatment, particularly at the time of low-temperature stretching, in another particularly preferable aspect of the apparatus according to the present invention, a thread penetration opening is provided between the first godet peripheral wall and the second godet peripheral wall. The provided heat insulating material is formed. If comprised in this way, the godet surface warmed by low temperature will not receive the influence from the high temperature process of the thread | yarn at the time of relaxation.

  For this purpose, the second godet peripheral wall, the third godet peripheral wall and the fourth godet peripheral wall are arranged together in a godet box provided with a heat insulating material, thereby stabilizing the yarn to relax. The environment is born.

  In order to stabilize the heat treatment before stretching, in another aspect of the apparatus according to the present invention, the first godet peripheral wall is encapsulated in the second godet box.

  In order to be able to perform the speed adjustment necessary for stretching and relaxation in the godet peripheral wall, a separately-controllable godet drive device is arranged corresponding to each of the first godet peripheral wall and the second godet peripheral wall. ing. Further, one common godet driving device is disposed corresponding to the third godet peripheral wall and the fourth godet peripheral wall.

  In particular, in order to utilize a relatively short contact surface between the yarn and the first godet peripheral wall for warming the yarn, in another preferred aspect of the present invention, on the entry side of the first godet, Two guide rollers each having one driven guide wall are provided, and the guide rollers are arranged on the upstream side of the first godet wall. If comprised in this way, the tension | tensile_strength in the inside of a thread | yarn group which accelerates | stimulates the strong speed to the warmed 1st godet surrounding wall can already be produced. At this time, a desired yarn tension can be generated by the difference in diameter between the guide roller and the godet peripheral wall.

  Next, the method according to the present invention will be described in detail for several embodiments of the apparatus according to the present invention with reference to the drawings.

1 schematically shows a first embodiment of an apparatus according to the invention. It is a top view which shows roughly the godet arrangement | positioning form of embodiment shown in FIG. 3.1 and 3.2 are diagrams showing only the godet arrangement form of the embodiment shown in FIG. It is a figure which shows schematically another godet arrangement | positioning form of embodiment shown in FIG.

  1 and 2 show a first embodiment of an apparatus according to the invention for producing a fully drawn synthetic yarn by drawing and relaxing a plurality of freshly spun yarns, and having a plurality of different lines of sight. Shown schematically in direction. FIG. 1 schematically shows the entire apparatus in a front view, and FIG. 2 schematically shows a godet apparatus provided for stretching and relaxation in a plan view. Unless explicitly referred to one of the drawings, the following description is for both figures.

  FIG. 1 schematically shows an embodiment of an apparatus according to the invention for producing a fully drawn synthetic yarn. This embodiment comprises a spinning device 1, which comprises a heated spinning beam 1.1 and a plurality of spinning nozzles 1 held on the spinning beam 1.1 in a row arrangement. .2. Since the spinning nozzles 1.2 are arranged one after the other in the direction perpendicular to the drawing plane, only one of the spinning nozzles 1.2 is shown in the drawing of FIG. The spinning nozzle 1.2 on the lower side of the spinning beam 1.1 is connected to the melt supply path 1.3. At this time, the spinning beam 1.1 includes a spinning pump and a distribution pipe. A melt distribution system is in place.

  A cooling device 2 is provided under the spinning device 1, and this cooling device 2 forms one cooling duct 2.1 under the spinning nozzle 1.2 in the vertical direction. The cooling duct 2.1 is arranged inside the blow chamber 2.2. In this embodiment, the cooling duct 2.1 is formed by a cooling cylinder having an air-permeable wall, so that the cooling air flowing out from the blow chamber 2.2 is spun from the radially outer side toward the inner side. Collides with a filament strand that has just been made. The blow chamber 2.2 is connected via an air connection 2.3 to a cooling air source not shown here.

  A plurality of collective yarn guides 3 are provided under the cooling device 2 in order to combine the filaments spun from the spinning nozzle 1.2 into one yarn.

  Under the collective yarn guide 3, a yarn entering device 21 is provided. In the yarn entering device 21, the yarns are gathered together at a constant processing interval. The yarn feed-in device 21 forms a gathering point where the yarn is supplied to the suction device when the yarn breaks. The yarn feed-in device 21 forms an interface between the spinning device and a plurality of godet godet devices arranged downstream of the spinning device to draw, stretch and relax the just-spun yarn. ing.

  In the embodiment shown in FIG. 1, a plurality of godets 4.1 to 4.4 are arranged on the downstream side of the yarn entering device 21, and these godets 4.1 to 4.4 are each one yarn. They are arranged side by side on the runway. To further describe the godet device, reference is further made to FIG.

  As is clear from FIGS. 1 and 2, the godets 4.1 to 4.4 have protruding godet peripheral walls 5.1 to 5.4, respectively, and these godet peripheral walls 5.1 to 5.4 are It is held on the front side of the mounting wall 10. The godet peripheral walls 5.1 to 5.4 are connected to one godet motor 6.1 to 6.4 via a drive shaft not shown in detail here. For example, the first godet peripheral wall 5.1 is driven by a godet motor 6.1, and a drive control device 7.1 is arranged corresponding to the godet motor 6.1. Correspondingly, the second godet peripheral wall 5.2 is driven by a second godet motor 6.2, which is likewise provided with a separate drive control device 7.2.

  The third godet peripheral wall 5.3 is connected to the third godet motor 6.3, and the fourth godet peripheral wall 5.4 is connected to the fourth godet motor 6.4. 6.4 is connected to one common drive controller 7.3.

  In particular, as can be seen from the illustration in FIG. 2, the godets 4.1 to 4.4 have separate heating means 8.1 to 8.4, respectively, and these heating means 8.1 to 8.4 are The godet peripheral walls 5.1 to 5.4 are arranged correspondingly and can be controlled by separate heating control devices 9.1 to 9.3.

  Since the godet motors 6.1 to 6.4 are alternately formed by a left rotation motor and a right rotation motor, the adjacent godet peripheral walls 5.1 and 5.2 can be driven in mutually opposite rotation directions. It is. As a result, the yarns can be guided together as a single yarn group 19 by partial winding around the godet peripheral wall 5.1-5.4. Depending on the arrangement type of the godet peripheral walls 5.1 to 5.4, in order to guide the yarn around the godet peripheral walls 5.1 to 5.4, a partial winding of less than 360 °, preferably 180 ° to 270 ° Partial wrapping in the range is obtained.

  As can be seen from the drawings in FIGS. 1 and 2, the godet peripheral walls 5.2, 5.3, and 5.4 of the godets 4.2 to 4.4 are disposed inside the godet box 11 and are surrounded by the surroundings. It is insulated and held. The godet box 11 has an inlet opening 12 between the first godet peripheral wall 5.1 and the second godet peripheral wall 5.2, and the yarn group 19 is guided through the inlet opening 12. On the side opposite to the inlet opening 12, the godet box 11 is provided with an outlet opening 13 through which the yarn group 19 exits the godet box 11.

  As can be seen from the illustration in FIG. 1, the yarn group 19 is guided through the two guide rollers 14.1, 14.2 after stretching and relaxation, and both guide rollers 14.1, 14.2 are driven, respectively. Guide peripheral walls 15.1 and 15.2. An oil supply device 22 is disposed on the upstream side of the guide roller 14.1, and the yarn group is wetted after drawing by the oil supply device 22. In a further course, an entanglement device 23 is provided between the guide rollers 14.1, 14.2, and this entanglement device 23 has a processing path (not shown) for each yarn. ing. This allows the filaments of the yarn to be vortexed separately and entangled in order to make the application of the oil uniform and to form a yarn joint.

  At the end of the process, the yarn is fed to a winder to wind the yarn and wind the package. A winder not shown in the present embodiment can have one or more groups of winding points to wind a number of yarns simultaneously to form a package.

  In the embodiment shown in FIGS. 1 and 2, a plurality of multifilament yarns are lined up from one another, preferably from a polymer melt fed to the melt feed path 1.3 via an extruder, through a spinning nozzle 1.2. It is born. FIG. 1 shows filaments 20 of one of the yarns, and these filaments 20 are combined into one yarn by a collecting yarn guide 3 arranged corresponding to the spindle nozzle 1.2. . In order to spin the yarn, for example, 10, 12 or more spinning nozzles may be arranged under the spinning beam 1, whereby a plurality of yarns of one yarn group can be formed. However, it is also possible to use so-called double spinning nozzles in which two yarns are extruded simultaneously from one of the spinning nozzles.

  After the filaments have been cooled and grouped together into one yarn, the yarn group 19 is guided through the yarn run-in device 21 to place a short yarn spacing between each other for further processing. The yarns of the yarn group 19 are arranged in parallel with each other and are first accommodated by the first godet peripheral wall 5.1 of the first godet 4.1. The first godet peripheral wall 5.1 is heated to a surface temperature in the range of 40 ° C. up to 80 ° C. by the associated heating means 8.1. This results in heating of the yarn group, which remains just below the glass transition temperature (Glasumwandlungstemperatur). The first godet peripheral wall 5.1 is driven at a peripheral speed in a range exceeding 1500 m / min. An extension length for a free yarn guide is formed between the first godet peripheral wall 5.1 and the second godet peripheral wall 5.2. Within this stretched length, the yarn group 19 is fully stretched, at which time the second godet circumferential wall 5.2 is at a circumferential speed in the range above 3500 m / min, preferably at a circumferential speed in the range above 4000 m / min. Driven. The second godet peripheral wall 5.2 has a surface temperature significantly higher than that of the first godet peripheral wall 5.1. For example, the godet peripheral wall 5.2 is heated at a temperature in the range above 100 ° C., preferably at a temperature in the range above 120 ° C. to 200 ° C. As a result, immediately after drawing, the yarn group 19 starts post-treatment with heat, whereby internal stress in the molecular structure of the filament can be removed. In order to relax the yarn, the yarn group is heat treated in several stages. For example, the third godet peripheral wall 5.3 and the fourth godet peripheral wall 5.4 are similarly heated to a surface temperature in the range of 100 ° C. to 250 ° C. Between the second godet peripheral wall 5.2 and the third godet peripheral wall 5.3, a first relaxation section for a free yarn guide is formed. The second relaxation section is provided between the third godet peripheral wall 5.3 and the fourth godet peripheral wall 5.4.

To illustrate and explain the free thread length in the tension and relaxation sections, refer to FIGS. 3.1 and 3.2. In FIG. 3.1 and FIG. 3.2, the arrangement of the godets 4.1 to 4.4 is schematically shown. In FIG. 3.1, the yarn running path of the yarn group 19 is shown together. At this time, the tension section between the first godet peripheral wall 5.1 and the second godet peripheral wall 5.2 is capital letter S. It is shown. The first relaxation interval is indicated by capital letters R _1, is formed between the second godet wall 5.2 and third godet wall 5.3. The second relaxation interval, indicated by the capital letters R _2, extends between the godet wall 5.3 and godet wall 5.4. At this time, the tension section and the relaxation section represent a free yarn length that occurs between the feeding point around the godet peripheral wall and the yarn winding point on the adjacent godet peripheral wall.

In contrast, FIG. 3.2 shows the pure spacing between the godet walls. For example spacing between the godet wall 5.1 and godet wall 5.2, referred to as stretching gap, indicated by the capital letters G _S. A second godet wall 5.2 first relaxation interval between the third godet circumferential wall 5.3 is indicated by reference numeral G _R1. Second relaxation interval occurring between the godet wall 5.3 and godet wall 5.4 is referred to as the G _R2.

  In particular, at the time of drawing the yarn, in order to obtain a yarn guide that is as stable as possible, the drawing length S is limited to a range of 100 mm to 350 mm. The stretching interval between the first godet peripheral wall 5.1 and the second godet peripheral wall 5.2 thus has a value in the range of 40 mm to 200 mm.

The relaxation sections R ₁ and R ₂ are formed in the same size in this embodiment. However, basically, the relaxation zones R ₁ and R ₂ can also be formed with different sizes. In the present embodiment, the relaxation sections R ₁ and R ₂ are formed for free yarn guidance in the range of 100 mm to 200 mm. This makes it possible to obtain a relatively uniform yarn temperature for the yarn within the entire relaxation zone. The relaxation intervals between the godet peripheral wall 5.2 and the godet peripheral wall 5.3 and between the godet peripheral wall 5.3 and the godet peripheral wall 5.4 are formed in a range of 30 mm to 150 mm depending on the arrangement of the godets. ing.

In the heat treatment of the multi-stage to mitigate the yarn, in order to obtain a rapid and intensive heating, yarn group is guided with a speed difference to give rise to thread tension in the first relaxation interval R _1. Thus, the first free relaxation zone is utilized for thermal homogenization of the temperature substantially inside the filament bundle. Disappearance of the internal stress is mainly performed in the second relaxation interval R ₂ between the third godet wall 5.3 and fourth godet wall 5.4. For this purpose, the yarn is guided almost without stress, and at this time, the peripheral speeds of both godet peripheral walls are preferably set to the same magnitude. In order to continue the stress extinction, the peripheral speed of the fourth godet peripheral wall 5.4 is preferably larger than the peripheral speed of the guide peripheral wall 15.1 arranged downstream of the subsequent guide roller 14.1. Selected. In this way, the yarn group is smoothly delivered to the subsequent process smoothly.

  In a further course, the yarns of the yarn group 19 are wetted by the fluid by the oil supply device 22 after the stress has disappeared and then individually entangled in the entanglement device 23.

  The method according to the invention and the device according to the invention are particularly suitable for producing fully drawn yarns (FDY) of fine counts. At this time, polyester and polyamide can be used as the yarn material.

  In the embodiment of the device according to the invention shown in FIGS. 1 and 2, after cooling, the yarn is drawn for drawing in a substantially dry state. Basically, however, it is also possible to lightly apply an oil agent with little moisture after cooling to the yarn.

  The embodiment of the godet arrangement shown in FIGS. 1 and 2 is also an example. FIG. 4 shows another embodiment of a godet arrangement, which can be used, for example, under a spinning device according to the embodiment shown in FIG. In this embodiment, two guide rollers 14.1 and 14.2 are provided in the run-in part in front of the first godet 4.1, and both guide rollers 14.1 and 14.2 are driven. Guide peripheral walls 15.1 and 15.2 are provided. The diameters of the guide peripheral walls 15.1 and 15.2 are smaller than the diameters of the godet peripheral walls 5.1 to 5.4, respectively. The guide peripheral walls 15.1, 15.2 are configured not to be heated. A preload is applied to the yarn group 19 by the guide peripheral walls 15.1, 15.2, so that a strong contact can already be obtained around the first godet peripheral wall 5.1. Thereby, by arranging such guide rollers 14.1 and 14.2 on the upstream side, strong contact for adjusting the temperature of the yarn group 19 on the first godet peripheral wall 5.1 can be generated. it can.

  In the embodiment shown in FIG. 4, the first godet peripheral wall 5.1 of the godet 4.1 is arranged in the first godet box 16 and the godet peripheral walls 5.2 to 5.4 are second godet walls. It is arrange | positioned in the dead box 11, and the godet box 11 has the heat insulating material 17 with respect to the circumference | surroundings at this time.

  The godet boxes 11 and 16 form one unit and are connected to each other through a through opening 18 for a yarn guide.

  For yarn guide, the godet box 16 has a slit-shaped inlet opening 12 on the upper side, and the godet box 11 has a slit-shaped outlet opening 13 on the lower side.

  Godet 4.1 is formed with a heating device not shown, which can selectively heat the godet peripheral wall 5.1 to a surface temperature of 40 ° C. to a maximum of 80 ° C. Alternatively, it can be brought to room temperature by shutting down the heating device. If the yarn can be guided at low temperatures before drawing, this makes the formation of draw points uniform at a high level, especially in filament composites. The choice of low temperature is then matched to the polymer type.

  In the subsequent godets 4.2 to 4.3, a post-treatment of the yarn with heat for relaxation is carried out as already described for the embodiment shown in FIGS.

  The method according to the invention and the device according to the invention are particularly suitable for producing a large number of yarns parallel to one another and with substantially identical physical properties.

Claims (16)

A method of producing fully drawn synthetic yarn (FDY) by drawing and relaxing a plurality of freshly spun yarns, wherein the spun yarns are combined together as one yarn group after cooling and curing Guiding around a plurality of driven godet peripheral walls, bringing the yarn into contact with the godet peripheral wall with partial wrapping of less than 360 °, heat treating the yarn on the surface of the godet peripheral wall, and Freely guiding between the godet peripheral walls with at least one speed difference between the godet peripheral walls,
The yarn is guided and fully stretched in a free tension section between the first godet peripheral wall and the heated second godet peripheral wall, and the yarn is then stretched between 40 ° C. and 80 ° C. before stretching. Characterized in that the yarn is guided at room temperature before drawing by pre-treatment with heat at the surface temperature of the godet peripheral wall or at this time by shutting down the heating device of the first godet peripheral wall A method for producing a drawn synthetic yarn.   The method according to claim 1, wherein the yarn is guided with a free yarn length in the range of 150 mm to 350 mm for drawing in the free tension section.   The yarn in a first free relaxation section between the second godet peripheral wall and the third godet peripheral wall, and second between the third godet peripheral wall and the fourth godet peripheral wall; A method according to claim 1 or 2, wherein the yarn is guided and relaxed in a free relaxation section, wherein the yarn is guided in the relaxation section with one free thread length in the range of 100 mm to 200 mm. .   4. The yarn according to any one of claims 1 to 3, wherein the yarn is heat treated in a plurality of stages, each having a surface temperature of 100C to 250C, of one of the following godet peripheral walls for relaxation. Method.   5. The yarn according to claim 1, wherein the yarn is guided with a yarn tension generated by a speed difference in the first free relaxation section between the second godet peripheral wall and the third godet peripheral wall. The method of any one of Claims.   The method according to claim 5, wherein the yarn is guided with a slight yarn tension in the second relaxation section between the third godet peripheral wall and the fourth godet peripheral wall.   The method according to claim 5 or 6, wherein the yarn is guided after relaxation by delivery of the fourth godet peripheral wall to a subsequent godet and / or winder. An apparatus for producing a fully drawn synthetic yarn (FDY) by drawing and relaxing a plurality of yarns that have just been spun, and a spinning device (1) and a cooling device (2) for spinning a plurality of yarns; , A plurality of godets (4.1 to 4.4) are provided, and the godet (4.1 to 4.4) can be driven on the godet peripheral wall (5.1 to 5.2). Each thread group is guided by partial wrapping of less than 360 °. At this time, the godet peripheral wall (5.1 to 5.2) is configured to be separately heatable, and the godet peripheral wall (5.1 to 5.1) In a device in which at least one speed difference between the peripheral speeds of 5.4) is adjustable;
Between the first godet peripheral wall (5.1) and the second godet peripheral wall (5.2), a drawing interval (G _S ) for completely stretching the yarn is formed. At this time, the first godet peripheral wall (5.2) is formed. wall (5.1), the by separate heating means (8.1) are heatable configured at a surface temperature of 40 ° C. to 80 ° C., the first godet wall and (5.1) stretching distance between the second godet peripheral wall _(5.2) (G S) is characterized in that it has a value in the range of 40Mm～200mm, to produce a fully drawn synthetic thread device . Between the second godet peripheral wall (5.2) and the third godet peripheral wall (5.3), the first relaxation interval (G _R1) is formed, and the third godet peripheral wall 4 of between godet peripheral wall, it is formed a second relaxation interval (G _R2) is, the relax interval between godet (4.2 to 4.4) adjacent to each other at this time, the maximum of 150mm 9. The apparatus of claim 8, comprising:   10. The device according to claim 9, wherein the relaxation spacing between the godet peripheral walls (5.2 to 5.4) is formed with equal or different sizes.   The godet peripheral wall (5.1-5.2) of the godet (4.1-4.4) is formed with an equal diameter for heat treatment of the yarn. A device according to claim 1.   The heat insulating material (17) provided with the thread | penetration opening (18) is formed between the said 1st godet surrounding wall (5.1) and the said 2nd godet surrounding wall (5.2). The apparatus according to any one of 8 to 11.   The second godet peripheral wall (5.2), the third godet peripheral wall (5.3) and the fourth godet peripheral wall (5.4) together include a godet including the heat insulating material (17). Device according to any one of claims 8 to 12, arranged in a box (11).   14. The device according to claim 13, wherein the first godet peripheral wall (5.1) is arranged encapsulated in a first godet box (16).   The first godet peripheral wall (5.1) and the second godet peripheral wall (5.2) are individually controlled by godet driving devices (6.1, 6.2, 7.1, 7.2). ) And the third godet peripheral wall (5.3) and the fourth godet peripheral wall (5.4), one common godet drive device (6.3, 6.4, 15. A device according to any one of claims 8 to 14, wherein 7.3) is arranged correspondingly.   Two guide rollers (14.1, 14.2) each having one driven guide peripheral wall (15.1, 15.2) are provided on the entry side of the first godet (4.1). The guide roller (14.1, 14.2) is provided, and the guide roller (14.1, 14.2) is disposed upstream of the first godet peripheral wall (5.1). The device described.

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