Drawing device for spun yarns

Abstract

Drawing device for spun threads (2) comprising rollers used for drawing threads spun from a spinning device (4) and a thermally insulated box (24), wherein the threads are wound onto the rollers at a winding angle of 360° or less, the rollers comprising: at least one first roll (21a, 21b) which is provided in the thermally insulated box (24), second rolls (22a, 22b), each being a heating roll and provided in the thermally insulated box (24), and the threads coming from the at least one first roll (21a, 21b) are wound onto the second rolls (22a, 22b), and a third roller (23a, 23b) which is not a heating roller and onto which the threads coming from the second rollers (22a, 22b) are wound; wherein the yarn transport speeds of the second rollers (22a, 22b) are greater than the yarn transport speed of the at least one first roller (21a, 21b), the yarn transport speeds of the second rollers (22a, 22b) are provided in such a way that the yarn transport speed of each roller is greater than the yarn transport speed of an adjacent roller on the downstream side in the yarn direction, thereby subjecting the yarns to a looser thermal treatment, and the yarn transport speed of the third roller (23a, 23b) is less than the yarn transport speed of the second roller furthest downstream (22a, 22b) in the yarn direction.

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a drawing device for spun threads, which is designed to draw threads spun from a spinning device.

[0002] A known spinner includes elements such as a drawing device for spun threads, which is provided with rollers designed to draw threads spun from a spinning device and made of polyester or the like, and to thermally fix the threads, and a receiving winder designed to wind the threads drawn by the drawing device for spun threads and to form thread bodies.

[0003] A drawing device for spun threads, described in JP 2012-87436A, comprises a first heating roller, a first separate roller paired with the first heating roller, a second heating roller, and a second separate roller paired with the second heating roller. Threads are wound multiple times onto the first heating roller and the first separate roller, and then wound multiple times onto the second heating roller and the second separate roller.

[0004] The first heating roller on the upstream side is set to a temperature (not lower than the glass transition temperature) at which filaments can be drawn. The second heating roller on the downstream side is set to a temperature higher than that of the first heating roller, at which the drawn filaments can be thermally cured or fixed. The filament transport speed of the second heating roller on the downstream side is higher than that of the first heating roller on the upstream side. With this arrangement, the filaments, which have been preheated at the first heating roller on the upstream side, are drawn between the first heating roller on the upstream side and the second heating roller on the downstream side, which has a higher filament transport speed than the first heating roller on the upstream side.The stretched threads are then thermally hardened on the second heating roller.

[0005] WO 2011 / 009 497 A1 discloses a method and a device for drawing and stretching a synthetic thread to a fully stretched yarn, wherein the thread is formed by joining a plurality of extruded filaments and is guided in contact with the circumference of heated guide sheaths of several driven pairs of galettes.

[0006] DE 602 20 807 T2 discloses a method for producing spunbond nonwovens having filaments with high crimp levels, wherein the filaments are guided alternately under and over at least two serpentine feed rollers in a single wrap and subsequently alternately under and over at least two serpentine stretching rollers in a single wrap.

[0007] US Patent 2011 / 0121480A1 discloses a method and apparatus for melt spinning, drawing and winding a multifilament thread into an FDY thread, wherein a filament bundle is drawn off at a speed of over 1,500 m / min, heated to a temperature above the glass transition temperature of the thermoplastic material and drawn at a drawing speed of over 4,000 m / min.

[0008] DE 10 2011 109 784 A1 discloses a device for melt spinning, drawing, stretching, relaxing and winding a synthetic thread, wherein the galette system comprises at least one driven drawing galette, several driven stretching galettes and several driven relaxing galettes, which are arranged one behind the other in a thread run and guide the thread with a thread wrap of max. 270° on their guide sleeves, wherein the guide sleeves of the galettes are heated or unheated. SUMMARY OF THE INVENTION

[0009] It was desirable to produce threads with different properties, such as tensile strength, boiling water shortening (BWS), and Young's modulus, by changing the temperature and tension of the threads during drawing. In this regard, the drawing device for spun threads of JP 2012-87436A has the disadvantage that, since the thread transport speed of the second heating roll must be equal to that of the second separate roll, it is not possible to change the tension of the threads while they are being thermally hardened at the second heating roll. Therefore, the properties of the threads are controlled only by either changing the temperature of the second heating roll or changing the thread transport speed of the first heating roll relative to the second heating roll (i.e., changing the draw ratio). Thus, the degrees of freedom for controlling the properties of the threads are limited.

[0010] One object of the present invention is to modify the control of the properties of the threads by changing the tension of the thermally hardened threads.

[0011] Stretching devices according to the invention are defined in independent claims 1 and 5. Preferred embodiments thereof are specified in more detail in the dependent claims.

[0012] According to the first aspect of the invention, a drawing device for spun threads comprises rollers used for drawing threads spun from a spinning device, the threads being wound onto the rollers at a winding angle of 360° or less, the rollers comprising: at least one first roller provided in a thermally insulated box; second rollers, each of which is a heating roller and provided in a thermally insulated box, with the threads coming from the at least one first roller being wound onto the second rollers; and a third roller, which is not a heating roller, onto which the threads coming from the second rollers are wound.wherein the yarn transport speeds of the second rollers are set higher than the yarn transport speed of the at least one first roller, and the yarn transport speeds of the second rollers are provided such that the yarn transport speed of each roller is higher than the yarn transport speed of an adjacent roller on the downstream side with respect to a yarn direction, thereby subjecting the yarns to a looser thermal treatment, and the yarn transport speed of the third roller is provided to be lower than the yarn transport speed of the second roller furthest downstream in the yarn direction.

[0013] According to the present invention, the yarn transport speeds of the second rollers are configured such that the yarn transport speed of each roller is greater than the yarn transport speed of an adjacent roller on the downstream side with respect to the yarn direction, thereby subjecting the yarns to a looser thermal treatment. Alternatively, the yarn transport speeds of the second rollers are configured such that the yarn transport speed of each roller is less than the yarn transport speed of an adjacent roller on the downstream side in the yarn direction, thereby subjecting the yarns to a tensile thermal treatment. This makes it possible to control the properties of the yarns by changing (decreasing or increasing) the tension of the yarns that are thermally cured on the second rollers.This increases the degree of freedom in controlling the properties of the threads.

[0014] Based on this aspect, the yarn transport speed of the third roll, which carries the yarns coming from the second rolls, is lower than the yarn transport speed of the second roll furthest downstream in the yarn direction. Therefore, in addition to the intermittent heat treatment applied to the second rolls themselves, a loose heat treatment is performed between the second roll furthest downstream in the yarn direction and the third roll.

[0015] According to the second aspect of the invention, the drawing device for spun threads of the first aspect is provided such that the second rollers are thermosetting rollers and are set to a higher temperature than the first rollers.

[0016] According to the third aspect of the invention, the drawing device for spun threads of the first or second aspect is provided such that a thread transport speed difference between the second roll furthest downstream and the third roll is not greater than 20 m / min (meters per minute).

[0017] In accordance with this principle, the yarn transport speed difference between the second and third rollers, located furthest downstream, is not specified as exceeding 20 m / min. Since this difference in transport speed maintains the yarn tension between the rollers at a suitable level, it is possible to avoid problems such as excessive winding of the yarn onto the roller and yarn breakage.

[0018] According to the fourth aspect of the invention, the drawing device for spun threads of the first, second or third aspect is provided such that the thread transport speeds of the second rollers are provided in such a way that a thread transport speed difference between adjacent rollers is not greater than 20 m / min and the thread transport speed of each roller is greater than that of an adjacent roller on the downstream side in the thread direction.

[0019] In accordance with this aspect, the yarn transport speeds of the second rollers are designed such that the yarn transport speed difference between adjacent rollers does not exceed 20 m / min, and the yarn transport speed of each roller is greater than that of an adjacent roller on the downstream side in the yarn direction. Since this yarn transport speed difference maintains the yarn tension between the rollers at a suitable level, it is possible to avoid problems such as excessive winding of the yarns onto the roller and yarn breakage.

[0020] According to the fifth aspect of the invention, a drawing device for spun threads comprises rollers used for drawing threads spun from a spinning device, the threads being wound onto the rollers at a winding angle of 360° or less, the rollers comprising: at least one first roller provided in a thermally insulated box; second rollers, each of which is a heating roller and provided in a thermally insulated box, with the threads coming from the at least one first roller being wound onto the second rollers; and a third roller, which is not a heating roller, onto which the threads coming from the second rollers are wound.wherein the yarn transport speeds of the second rollers are set higher than the yarn transport speed of the at least one first roller, and the yarn transport speeds of the second rollers are provided such that the yarn transport speed of each roller is lower than the yarn transport speed of an adjacent roller on the downstream side in the yarn direction, thereby subjecting the yarns to a tensile thermal treatment, and the yarn transport speed of the third roller is provided to be lower than the yarn transport speed of the second roller furthest downstream in the yarn direction.

[0021] According to the sixth aspect of the invention, the drawing device for spun threads of the fifth aspect is provided such that a thread transport speed difference between the second roll furthest downstream and the third roll is not greater than 20 m / min.

[0022] In accordance with this principle, the yarn transport speed difference between the second and third rollers, located furthest downstream, is not specified as exceeding 20 m / min. Since this difference in transport speed maintains the yarn tension between the rollers at a suitable level, it is possible to avoid problems such as excessive winding of the yarn onto the roller and yarn breakage.

[0023] According to the seventh aspect of the invention, the drawing device for spun threads of the fifth or sixth aspect is provided such that the thread transport speeds of the second rollers are provided in such a way that a thread transport speed difference between adjacent rollers is not greater than 20 m / min and the thread transport speed of each roller is less than that of an adjacent roller on the downstream side in the thread direction.

[0024] In accordance with this principle, the yarn transport speeds of the second rolls are designed such that the yarn transport speed difference between adjacent rolls does not exceed 20 m / min, and the yarn transport speed of each roll is lower than that of an adjacent roll on the downstream side in the yarn direction. Since this yarn speed difference maintains the yarn tension between the rolls at a suitable level, it is possible to avoid problems such as excessive winding of the yarn onto the roll and thread breakage.

[0025] According to the present invention, the yarn transport speeds of the second rollers are configured such that the yarn transport speed of each roller is greater than the yarn transport speed of an adjacent roller on the downstream side in a yarn travel direction, thereby subjecting the yarns to a looser thermal treatment. Alternatively, the yarn transport speeds of the second rollers are configured such that the yarn transport speed of each roller is less than the yarn transport speed of an adjacent roller on the downstream side in the yarn travel direction, thereby subjecting the yarns to a tensile thermal treatment. This makes it possible to control the properties of the yarns by changing (decreasing or increasing) the tension of the yarns that are thermally hardened or fixed on the second rollers.This increases the degree of freedom regarding the control of the properties of the threads. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a front view of a spin winder of an embodiment of the present invention. Fig. Figure 2 is a profile of the spin winder of the embodiment of the present invention. DESCRIPTION OF PREFERRED EXECUTION FORMS

[0026] The following describes an embodiment of the present invention. Fig. Figure 1 is a front view of a spinner of the embodiment of the present invention, which includes a drawing device for spun threads. Fig. 2 is a profile of the spin winder. The following are the directions that are in Fig. 1 and Fig. 2 are shown, accordingly designated as an upward / reverse direction, a left / right direction and a forward / backward direction. As shown in Fig. 1 and Fig.As shown in Figure 2, the spinner includes a drawing device for spun threads 2 and a receiving winder 3. The spinner draws threads Y through the drawing device 2, the threads Y being spun from a spinning device 4 located above and added serially to the device 1. The spinner then sends the drawn threads to the receiving winder 3 and winds the threads Y onto the receiving winder 3. The threads Y are, for example, made of polyester fibers, which require temporary heating before drawing. It should be noted that oil is applied to the threads Y spun from the spinning device 4 by means of an oil supply line (not shown).

[0027] The drawing device 2 for spun threads contains elements, such as galettes 21a to 23b (rollers), which are intended for drawing the threads Y spun from the spinning device 4. Details of these rollers will be given later.

[0028] The receiving winder 3 is located below the spinning device 4 and forms yarn bodies P by winding the yarns Y, which are fed from the spinning device 4 via the drawing device 2 for spun yarns, onto bobbins B. The receiving winder 3 includes elements such as guide rollers 5 and 6, rotary axis guides 7, and two winding units 8.

[0029] Guide rollers 5 and 6 are drive rollers driven by a motor (not shown), and each roller has an axis extending parallel to the left / right direction. Guide roller 6 is positioned behind and above guide roller 5. The threads Y, fed by the drawing device for spun threads 2, are guided by guide rollers 5 and 6 to the rotary axis guides 7 below.

[0030] The rotary axis guides 7 are provided below the guide roller 6 and above the transverse guides 12 of a winding unit 8 described later. The rotary axis guides 7 are arranged above the corresponding transverse guides 12 and the corresponding coil formers B, which are attached to the coil former holder 11, at the same intervals as the coil formers B along the forward / reverse direction.

[0031] The winding unit 8 contains elements such as: a main body frame 9; a disc-shaped turntable 10 rotatably mounted on the main body frame 9; two bobbin holders 11 freely mounted on the turntable 10, each having a horizontally extending winding axis and each having bobbins B mounted serially or in series along the winding axis on each of them; the transverse guides 12, which are designed to run transversely with respect to the threads Y, and a contact roller 13, which is movable in the up / down direction with respect to the main body frame 9 and is able to come into contact with and move away from the bobbins B mounted on the bobbin holders 11.

[0032] The winding unit 8 rotates each coil former holder 11 by operating the motor (not shown), causing the coil formers B attached to the coil former holders 11 to rotate and wind the threads Y onto the rotating coil formers B. The threads Y wound onto the coil formers B run transversely in the axial directions of the coil formers B, with the rotation axis guides 7 acting as the axes or pivot points, through the transverse guides 12 provided above the respective coil formers B.

[0033] The threads Y, guided transversely around the rotary axis guides 7 by the transverse guides 12, are wound onto the bobbins B, resulting in the formation of thread bodies P. During this process, the contact roller 13 comes into contact with the outer circumferences of the thread bodies P as the threads are wound onto the bobbins B. The shape of each thread body P is adjusted by the rotation of the contact roller 13 and the application of a specific contact pressure to the thread bodies P. Once the thread bodies P, which are attached to the bobbin holder 11, are completely wound, they are pushed forward and removed from the bobbin holder 11 by means of a pressure means (not shown).

[0034] Next, the drawing device for spun threads 2 is described. The drawing device for spun threads 2 contains elements such as galettes 21a to 23b, a thermally insulated box 24, and a braiding unit 25. The drawing device for spun threads 2 is located below the spinning device 4.

[0035] The galettes 21a to 23b are designed to draw the threads Y spun from the spinning device 4. Each of the galettes 21a to 23b is a drive roller, cantilevered by a frame (not shown) and rotated by a motor (not shown). The galettes 21a to 23b comprise first galettes 21a and 21b (first rollers), second galettes 22a and 22b (second rollers), and third galettes 23a and 23b (third rollers). The first galettes 21a and 21b and the second galettes 22a and 22b are heating rollers, each containing a heater (not shown).

[0036] The first galettes 21a and 21b are preliminary heating galettes, on which the threads are wound and heated before drawing. These rollers are typically set to a temperature in the range of 80 to 100°C. Since the threads Y are made of polyester fibers, it is necessary to heat them to at least one glass transition temperature in order to draw them. It should be noted that different types of polymers have different glass transition temperatures. The threads Y coming from the first galettes 21a and 21b are wound onto the second galettes 22a and 22b. The second galettes 22a and 22b are thermosetting galettes, used for thermally curing or fixing the drawn threads Y. These rollers are typically set to a temperature in the range of 120 to 150°C.Thus, the second galettes 22a and 22b are set to a higher temperature than the first galettes 21a and 21b.

[0037] The axes of the first rollers 21a and 21b and the axes of the second rollers 22a and 22b run parallel to each other, and all these rollers have essentially the same diameter, for example, in the range of 220 to 300 mm. The first rollers 21a and 21b are positioned above the second rollers 22a and 22b. The first roller 21b is positioned above and to the left of the first roller 21a. The second roller 22b is positioned above and to the right of the second roller 22a.

[0038] The threads Y coming from the second galettes 22a and 22b are wound onto the third galettes 23a and 23b. The third galettes 23a and 23b are not heating coils and do not contain a heating element, such as a heater. The third galettes 23a and 23b are located outside the thermally insulated box 24 and to the right of the lower part of the thermally insulated box 24. The third galette 23b is located above and to the right of the third galette 23a. The threads Y are wound onto the first galettes 21a and 21b, the second galettes 22a and 22b, and the third galettes 23a and 23b, one after the other, from the upstream side, each with a winding angle of no more than 360°.

[0039] The thermally insulated box 24 contains the first galettes 21a and 21b and the second galettes 22a and 22b. The thermally insulated box 24 is essentially a rectangular parallelepiped box made of a heat-insulating material. This thermally insulated box 24 remains warm because the heat generated by the first galettes 21a and 21b and the second galettes 22a and 22b does not escape to the outside. A wall 28 is provided in the thermally insulated box 24 between the first galettes 21a and 21b and the second galettes 22a and 22b. Because of this wall 28, the first galettes 21a and 21b do not affect the second galettes 22a and 22b, which are set to a different temperature, and vice versa. A slot 26 is formed through the upper surface of the thermally insulated box 24, through which the threads Y are introduced into the thermally insulated box 24.The threads Y enter the thermally insulated box 24 through the slot 26 and are then wound onto the first galette 21a. A slot 27 is formed in the right side surface of the thermally insulated box 24 (the side surface on the side of the third galettes 23a and 23b) to allow the threads Y to exit the thermally insulated box 24. The threads Y, which are fed from the second galette 22b, exit through the slot 27 and run out of the thermally insulated box 24 and are then wound onto the third galette 23a.

[0040] The interlacing unit 25 bundles the filaments that form each thread Y by interlacing the threads together using a fluid discharge nozzle, in order to limit the widening of gaps in the fibers and the separation of the fibers. The interlacing unit 25 is located between the third galette 23a and the third galette 23b.

[0041] The threads Y, spun from the spinning device 4, come into contact with the first galettes of the preliminary heating elements 21a and 21b to be temporarily heated to a temperature not lower than the glass transition temperature. As the first galettes of the preliminary heating elements 21a and 21b rotate, the threads Y are advanced to the thermosetting second galettes 22a and 22b on the downstream side. In this context, the thread transport speed V2 of the first galette 21b is designed to be somewhat (a few tens of meters per minute) greater than the thread transport speed V1 of the first galette 21a (V1 < V2) in order to limit the reduction in tension due to the decrease in the internal stress of the threads Y, which occurs when the threads Y are heated at the first galette 21a.Furthermore, the thread transport velocity V3 of the second galette 22a and the thread transport velocity V4 of the second galette 22b are designed to be correspondingly greater than the thread transport velocity V1 of the first galette 21a and the thread transport velocity V2 of the first galette 21b (V1 < V2 << V3, V1 < V2 << V4). Since the second galettes 22a and 22b on the downstream side have a greater thread transport velocity than the first galettes 21a and 21b on the upstream side, the threads Y are stretched between the first galettes 21a and 21b and the second galettes 22a and 22b. The stretched threads Y come into contact with the thermo-curing second galettes 22a and 22b and are thermally fixed and are then brought to the third galettes 23a and 23b by rotating the second galettes 22a and 22b.It should be noted that the thread transport speed is determined by the rotational speed of the roller and the diameter of the roller.

[0042] In known drawing devices for spun threads, the properties of the threads can be controlled by changing the drawing ratio (difference in thread transport speed) between the first and second galettes. However, if the drawing ratio is changed while the threads are in the drawable state, several properties are altered simultaneously to a significant degree because the molecular orientation is significantly changed. For this reason, it is difficult to control the properties of the threads by changing the drawing ratio. Taking this problem into account, the present invention provides that the tension of the threads can be varied during thermal fixing, in which the molecular orientation does not change significantly, in order to control the properties of the threads.

[0043] In the drawing device for spun threads 2 of the present invention, the thread transport speed V3 of the second galette 22a and the thread transport speed V4 of the second galette 22b are set such that the roller on the downstream side is slower in the thread transport direction than the roller on the upstream side in order to achieve a looser thermal treatment of the threads Y. In other words, to subject the threads Y to the looser thermal treatment, the thread transport speed V4 of the second galette 22b is designed to be lower than the thread transport speed V3 of the second galette 22a (V3 > V4). Consequently, it is possible to control the properties of the threads Y by changing (decreasing) the tension of the threads that are thermally hardened or fixed on the second galettes 22a and 22b. The degree of freedom with regard to controlling the properties of the threads Y is thus increased.

[0044] It should be noted that the term "loosened thermal treatment" refers to thermal fixing or thermosetting, which is performed while the fibers Y are loosened or less taut. Since the loosened thermal treatment reduces the molecular alignment in the amorphous region of the fibers Y, it is possible to produce fibers Y with low boiling water shortening (BWS) and Young's modulus.

[0045] Furthermore, the yarn transport speed V5 of the third galette 23a is lower than the yarn transport speed V4 of the second galette 22b, which is the roll furthest downstream in the yarn direction (V3 > V4 > V5). For this reason, a less intensive heat treatment is performed between the second galette 22b, which is the roll furthest downstream in the yarn direction, and the third galette 23a, in addition to the less intensive heat treatment of the second galettes 22a and 22b.

[0046] In addition, the yarn transport speed difference between the yarn transport speed V4 of the second galette 22b, which is the roller furthest downstream in the yarn direction, and the yarn transport speed V5 of the third galette 23a is preferably not greater than 20 m / min. Since this transport speed difference keeps the tension of the yarns Y between the second galette 22b and the third galette 23a at a suitable level, it is possible to avoid problems such as excessive winding of the yarns Y onto the roller and thread breakage.

[0047] The difference in yarn transport speed between the yarn transport speed V3 of the second galette 22a and the yarn transport speed V4 of the second galette 22b is preferably set to no more than 20 m / min. Since this difference in transport speed keeps the tension of the yarns Y between the second galette 22a and the second galette 22b at a suitable level, it is possible to avoid problems such as excessive winding of the yarns Y onto the spool and thread breakage.

[0048] In addition, in the drawing device for spun threads 2 of the present invention, the thread transport speed V3 of the second galette 22a and the thread transport speed V4 of the second galette 22b are configured such that the roller on the downstream side is faster than the other roller in the thread travel direction, thereby achieving the tensile thermal treatment of the threads Y. That is, in order to subject the threads Y to the tensile thermal treatment, the thread transport speed V4 of the second galette 22b is configured to be greater than the thread transport speed V3 of the second galette 22a (V3 < V4). Consequently, it is possible to control the properties of the threads Y by changing (increasing) the tension of the threads that are thermally fixed to the second galettes 22a and 22b. The degree of freedom with regard to controlling the properties of the threads Y is thus increased.

[0049] Tensile thermal treatment is a thermal fixation process performed while the Y fibers are stretched. Because tensile thermal treatment enhances the molecular alignment in the amorphous region of the Y fibers, it is possible to produce Y fibers with increased boiling water shortening (BWS) and Young's modulus.

[0050] In addition, the yarn transport speed V5 of the third galette 23a is greater than the yarn transport speed V4 of the second galette 22b, which is the roll furthest downstream in the yarn direction (V3 < V4 < V5). Consequently, in addition to the tensile thermal treatment on the second galettes 22a and 22b, the tensile thermal treatment is also carried out between the second galette 22b, furthest downstream in the yarn direction, and the third galette 23a.

[0051] In addition, the yarn transport speed difference between the yarn transport speed V4 of the second galette 22b, which is the most downstream roller in the yarn direction, and the yarn transport speed V5 of the third galette 23a is preferably not greater than 20 m / min. Since this yarn transport speed difference keeps the tension of the yarns Y between the second galette 22b and the third galette 23a at a suitable level, it is possible to avoid problems such as excessive winding of the yarns Y onto the roller and yarn cutting.

[0052] In addition, the yarn transport speed difference between the yarn transport speed V3 of the second galette 22a and the yarn transport speed V4 of the second galette 22b is preferably set to no more than 20 m / min. Since this transport speed difference keeps the tension of the yarns Y between the second galette 22a and the third galette 23b at a suitable level, it is possible to avoid problems such as excessive winding of the yarns Y onto the spool and thread breakage.

[0053] The temperature of the second galette 22a is preferably set equal to or slightly higher (by no more than 10°C) than the temperature of the second galette 22b. This makes it possible to efficiently raise the temperature of the threads Y to the temperature required for thermosetting.

[0054] Although the embodiment of the present invention has been described, the embodiment of the present invention is not limited to the one above and can be suitably modified within the scope of the present invention, as described in the examples below.

[0055] In the embodiment above, the number of first galettes 21a and 21b on which the threads Y run before drawing is two. Alternatively, the number of first galettes on which the threads Y run before drawing can optionally be determined, as long as at least one roller is provided.

[0056] In the above embodiment, the first rollers 21a and 21b, on which the threads Y run before drawing, are heating rollers. Alternatively, these rollers can be non-heating rollers, each containing no heater, or they can be rollers that each have a heater but are used in an unheated operating mode in which the heater is switched off, taking into account the type of threads being produced, for example, nylon, which can be drawn at room temperature.

[0057] In the embodiment above, the number of second galettes 22a and 22b, onto which threads Y coming from the first galettes 21a and 21b are wound, is two. Alternatively, the number of second galettes can be optional, as long as more than one galette is provided.In such cases, the yarn transport speeds of the second galettes are provided to be greater than the yarn transport speeds of the first galettes 21a and 21b, and the yarn transport speeds of the second galettes are provided such that the speed of each roll is greater than the speed of the immediately adjacent downstream roll in the yarn direction, thereby subjecting the yarns Y to a loosened thermal treatment, or the speed of each roll is less than the speed of the immediately adjacent downstream roll in the yarn direction, thereby subjecting the yarns Y to a tensile thermal treatment. Furthermore, the yarn transport speed difference between two adjacent second galettes in the yarn direction is provided to be no greater than 20 m / min.

[0058] In the embodiment above, the number of third galettes onto which the threads Y coming from the second galettes 22a and 22b are wound is greater than one. Alternatively, the number of third galettes can be one. Furthermore, the number of third galettes need not be two, as in the embodiment above, but can be three or more.

[0059] In the above embodiment, the thread transport speed V4 of the second galette 22b differs from the thread transport speed V5 of the third galette 23a. Alternatively, the thread transport speed V4 of the second galette 22b can be identical to the thread transport speed V5 of the third galette 23a (V4 = V5).

[0060] While in the above embodiment the first galettes 21a and 21b and the second galettes 22a and 22b have essentially identical diameters, these rollers can have different diameters.

[0061] While in the above embodiment the third galette 23a is not a heating roller, this roller can be a heating roller.

Claims

[1] Drawing device for spun threads (2) comprising rollers for drawing threads spun from a spinning device (4) and a thermally insulated box (24), wherein the threads are wound onto the rollers at a winding angle of 360° or less, the rollers comprising: at least one first roll (21a, 21b) which is provided in the thermally insulated box (24), second rolls (22a, 22b), each being a heating roll and provided in the thermally insulated box (24), and the threads coming from the at least one first roll (21a, 21b) are wound onto the second rolls (22a, 22b), and a third roller (23a, 23b) which is not a heating roller and onto which the threads coming from the second rollers (22a, 22b) are wound; wherein the yarn transport speeds of the second rollers (22a, 22b) are greater than the yarn transport speed of the at least one first roller (21a, 21b), the yarn transport speeds of the second rollers (22a, 22b) are provided in such a way that the yarn transport speed of each roller is greater than the yarn transport speed of an adjacent roller on the downstream side in the yarn direction, thereby subjecting the yarns to a looser thermal treatment, and the yarn transport speed of the third roller (23a, 23b) is less than the yarn transport speed of the second roller furthest downstream (22a, 22b) in the yarn direction. [2] Drawing device for spun threads according to claim 1, wherein the second rollers (22a, 22b) are thermosetting rollers and are set to a higher temperature than the first rollers (21a, 21b). [3] Drawing device for spun threads (2) according to claim 1 or 2, wherein a thread transport speed difference between the second roll furthest downstream (22a, 22b) and the third roll (23a, 23b) is not greater than 20 m / min. [4] Drawing device for spun threads (2) according to one of claims 1 to 3, wherein the thread transport speeds of the second rollers (22a, 22b) are provided in such a way that a thread transport speed difference between adjacent rollers is not greater than 20 m / min and the thread transport speed of each roller is greater than that of an adjacent roller on the downstream side in the thread travel direction. [5] Drawing device for spun threads (2) comprising rollers used for drawing threads spun from a spinning device (4) and a thermally insulated box (24), wherein the threads are wound onto the rollers at a winding angle of 360° or less, the rollers comprising: at least one first roll (21a, 21b) which is provided in the thermally insulated box (24), second rolls (22a, 22b), each being a heating roll and provided in the thermally insulated box (24), and the threads coming from the at least one first roll (21a, 21b) are wound onto the second rolls (22a, 22b), and a third roller (23a, 23b) which is not a heating roller and onto which the threads coming from the second rollers (22a, 22b) are wound; wherein the yarn transport speeds of the second rollers (22a, 22b) are greater than the yarn transport speed of the at least one first roller (21a, 21b), the yarn transport speeds of the second rollers (22a, 22b) are provided in such a way that the yarn transport speed of each roller is less than the yarn transport speed of an adjacent roller on the downstream side in the yarn travel direction, thereby subjecting the yarns to a tensile thermal treatment, and the yarn transport speed of the third roller (23a, 23b) is less than the yarn transport speed of the second roller furthest downstream (22a, 22b) in the yarn direction. [6] Drawing device for spun threads (2) according to claim 5, wherein a thread transport speed difference between the second roll furthest downstream and the third roll (23a, 23b) is not greater than 20 m / min. [7] Drawing device for spun threads (2) according to claim 5 or 6, wherein the thread transport speeds of the second rollers (22a, 22b) are provided in such a way that a thread transport speed difference between adjacent rollers is not greater than 20 m / min and the thread transport speed of each roller is less than that of an adjacent roller on the downstream side in the thread direction.

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