JP2007297764A - Nipping-type false-twister - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nipping-type false-twister capable of texturing a wide range of filament yarns including thin to thick ones, and also capable of suppressing fluffings in the above range. <P>SOLUTION: The nipping-type false-twister 104 is such that respective endless belts 12 wrapped on a pair of pulleys 10 and 11 are disposed so as to be crossed each other with filament yarn nipped at the cross-point; wherein the two endless belts 12 are wrapped in parallel to each other on the pair of pulleys 10 and 11, and the surface of each of the belts 12 is provided with grooves 12a extending in the belt's longitudinal direction and divided by these grooves 12a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a nip type false twisting device that imparts false twist to a filament yarn.

  2. Description of the Related Art Conventionally, false twisting machines that perform false twist processing on multifilament yarns include a false twist device for applying false twist to the filament yarns. As this false twisting device, a nip type false twisting device (nip twister) is known in which belts wound around a pair of pulleys cross each other, and a yarn is nipped and twisted at this intersecting portion (nip twister) ( For example, see Patent Document 1 (Japanese Patent Laid-Open No. 64-68531) and Patent Document 2 (Japanese Patent Laid-Open No. 6-228836). There is also known a nip type false twisting device in which an endless belt is wound around a pair of pulleys in two rows (for example, see Patent Document 3 (Japanese Patent Laid-Open No. 6-33328)). In this false twisting apparatus, since one yarn is nipped in two steps, slip is unlikely to occur between the yarn and the belt.

  On the other hand, a friction twister type comprising a large number of friction disks provided on each of the parallel three-axis spindles, and twisting the yarns while contacting the yarns between the rotating friction disks with their peripheral surfaces. A false twisting device is also known.

  The former nip type false twisting device can twist a yarn by strongly niping the yarn with high contact pressure between intersecting belts. For this reason, when applying a twisting force to a thick yarn (for example, a yarn of 300 denier or more), it is necessary to apply a certain amount of force to the yarn. This is advantageous.

  On the other hand, when false twisting is applied to a relatively thin yarn, the force acting on the yarn may be weak. In this case, in the nip type false twisting device, the contact pressure between the belt and the yarn at the time of nip is set to a small value. The effects of bending and bending cannot be ignored. For example, when the contact pressure is set by adjusting the air pressure that urges one belt toward the other belt, if this air pressure setting value is reduced, the effects of device errors, belt vibration and deflection, etc. As a result, the contact pressure actually acting on the yarn (effective contact pressure) may fluctuate. Thus, when the effective contact pressure fluctuates, when twisting is applied to a yarn by a single nip, the twist is likely to be concentrated and applied to a specific filament, so that it is applied to a plurality of filaments constituting the yarn. The twists that are made vary. As a result, the lengths of the plurality of filaments vary and filament breakage is likely to occur, and as a result, more fluff is generated. On the other hand, in the friction twister type, the twist angle of each filament is almost determined by the size, shape, and arrangement of the friction disk, and moreover, the twist is given little by little by many friction disks. The twist angle of each filament is stabilized. Therefore, when false twisting is performed on a thin yarn by a nip type false twisting device, there is a tendency that fluff is generated more than the friction disk type.

  Note that the nip type false twisting device disclosed in Patent Document 3 nips one yarn in two portions, but prevents slipping at the time of nip and makes the yarn twist evenly over its entire length. It is intended to do so, and is not intended to equalize the twist imparted to each of the plurality of filaments constituting the yarn.

  An object of the present invention is to provide a false twisting device capable of processing a wide range of filament yarns from thin yarns to thick yarns, and further capable of suppressing the occurrence of fluff in these thickness ranges. It is.

Means and effects for solving the problems

  A nip type false twisting device according to a first aspect of the present invention is a nip type false twisting device that includes two yarn nip units, sandwiches a yarn between the two yarn nip units, and applies twist to the yarn. Each of the plurality of yarn nip members has a plurality of yarn nip members, and the plurality of yarn nip members are arranged in parallel. Are formed, respectively.

  According to this configuration, since a plurality of pairs of yarn nip members are arranged in parallel, the nip length (the length of the portion where the yarn is nipped) is increased, and a large pressing force is applied to the yarn nip member. However, since the actual contact pressure (effective contact pressure) acting on the yarn is reduced, even if the effective contact pressure is lowered, a large pressing force can be applied to the yarn nip member to stabilize the yarn nip member, and thin threads are processed. It becomes possible to do. Further, when the nip length is increased, a large twisting torque can be applied to the yarn, so that a thick yarn can be processed. That is, it is possible to process a wide range of yarns from thin yarns to thick yarns. The number of grooves to be divided is not limited to one and may be two or more.

  Further, since the surfaces of both the yarn nip members of each pair are divided by the grooves, the number of times that one yarn is nipped further increases. In this way, by twisting the yarn a plurality of times, it is possible to evenly apply twist to all the filaments constituting the filament yarn, and to stabilize the propagation of the twist by making the twist angles of all the filaments uniform. it can. That is, since the variation in the length of each filament per unit length of the filament yarn is reduced and filament breakage is less likely to occur, the occurrence of fluff is suppressed.

  In the nip type false twisting device according to the second invention, in the first invention, each of the yarn nip units includes a pair of pulleys, and the yarn nip member is wound around the pair of pulleys. An endless belt, the endless belts are arranged so as to cross each other, and are configured to sandwich a yarn at the crossing portion, and a plurality of the endless belts are wound around the pair of pulleys in parallel. Further, a groove extending along the longitudinal direction of the belt is formed on the surface of each endless belt that contacts the yarn, and the surface of the endless belt that contacts the yarn is divided by the groove. .

  As described above, by using the endless belt as the yarn nip member, the same effect as that of the first invention described above can be obtained. In addition, since a plurality of belts are wound around a pair of pulleys, the warp of the belt can be suppressed as compared with the case of a single belt, and the yarn can be processed stably.

  The nip type false twisting device of the third invention is characterized in that, in the second invention, the two endless belts are wound around the pair of pulleys in parallel. If the number of endless belts wound around a pair of pulleys is too large, inconveniences such as excessive increase in power consumption when driving the pulleys occur. Therefore, it is preferable that the number of endless belts wound around a pair of pulleys is the minimum number necessary to suppress the occurrence of fluff, that is, about two.

  In the nip type false twisting device according to a fourth aspect of the present invention, in the second or third aspect of the invention, the outer peripheral surface of each pulley is formed with a plurality of annular curved portions protruding outward in an axial direction. It is characterized by.

  According to this configuration, the two endless belts are respectively wound around the two annular curved surface portions, whereby the two belts are not easily displaced in the axial direction of the pulley, and the yarn processing is stabilized.

  In the nip type false twisting device of the fifth invention, in the first invention, the yarn nip member of one yarn nip unit is an annular portion provided on at least one surface of a rotatable disk, and the other The yarn nip member of the yarn nip unit is an endless belt wound around a pair of pulleys and facing the one surface of the disc and having flexibility and elasticity, and the one of the discs A plurality of the annular portions are concentrically arranged on the surface of the belt, and a plurality of the endless belts are wound around the pair of pulleys in parallel. A groove is formed in the circumferential direction, and a groove extending in the length direction is formed on the surface of each endless belt that contacts the yarn.

  As described above, the yarn nip member includes the annular portion provided on at least one surface of the rotatable disk and the endless belt wound around the pair of pulleys. The same effect as that of the present invention can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a drawing false twisting machine 100 of the present embodiment. As shown in FIG. 1, the drawing false twisting machine 100 includes a yarn feeding section 1 </ b> A that holds a yarn feeding package 101 and a drawing false twisting process on a yarn Y that is unwound from the yarn feeding package 101 of the yarn feeding section 1 </ b> A. And a winding unit 1C that winds the processed yarn Y to form an appropriate package.

  The drawing false twisting machine 100 includes a plurality of processing units (weights) each having the yarn supplying unit 1A, the processing unit 1B, and the winding unit 1C. The plurality of weights are provided side by side in a direction perpendicular to the paper surface of FIG. Further, the yarn feeding section 1A and the winding section 1C are arranged with 2 to 4 spindles stacked one above the other in order to reduce the installation space.

  A peg 201 for holding the yarn supply package 101 is provided in the yarn supplying portion 1A of each weight, and each peg 201 is attached to a common creel stand 202 by a plurality of weights.

  The processing unit 1B for each weight is arranged in order along the flow of the yarn Y, the first feed roller 110, the primary heater 102, the cooler 103, the false twisting device 104, the second feed roller 111, the interlace nozzle 105. A secondary heater 106, a third feed roller 112, and the like are provided.

  The first to third feed rollers 110 to 112 are for feeding the yarn Y. The yarn feed speed of the second feed roller 111 is faster than that of the first feed roller 110, and the yarn feed speed of the third feed roller 112 is slower than that of the second feed roller 111. Each thread feed speed is set. Therefore, the yarn Y is stretched between the first feed roller 110 and the second feed roller 111, while the yarn Y is relaxed between the second feed roller 111 and the third feed roller 112.

  The yarn Y drawn between the first feed roller 110 and the second feed roller 111 is twisted by a nip type false twisting device 104 (nip twister) described later. More specifically, the yarn Y is twisted between the first feed roller 110 and the false twisting device 104. The yarn Y that has been twisted while being drawn is heat-set by the primary heater 102 and then cooled by the cooler 103 (cooling plate). The twisted and heat-set yarn Y is untwisted after passing through the false twisting device 104. In this way, the yarn Y subjected to the drawing false twisting process is partially entangled by air injection from the interlace nozzle 105, and is given the same convergence as the twisted yarn. The yarn Y to which the converging property is imparted by the interlace nozzle 105 is subjected to relaxation heat treatment by the secondary heater 106 and wound by the winding unit 1C to form a package.

  It should be noted that between the false twisting device 104 and the second feed roller 111, a twisting guide 107 for preventing the twist of the yarn Y from propagating downstream, and a winding angle of the yarn Y around the twisting guide 107 are predetermined. A guide roller 108 is provided to make the angle or more. The twist guide 107 and the guide roller 108 will be described in detail later.

  Next, the false twisting device 104 (nip type false twisting device) will be described in detail. FIG. 2 is a perspective view of the false twisting device 104. As shown in FIG. 2, the false twisting device 104 includes two pairs of belts each having a pair of pulleys 10 and 11 and an endless belt 12 wound around the pair of pulleys 10 and 11. A unit (yarn nip unit) 20 (20A, 20B) is provided.

  A pair of pulleys 10 and 11 of each belt unit 20 have the same structure, but one pulley 10 is a drive pulley that is driven to rotate by a motor (not shown) via a drive shaft 13, and the other pulley 11 is A driven pulley that is driven to rotate around a driven shaft (not shown) via a belt 12. FIG. 3 is a cross-sectional view of the drive pulley 10. As shown in FIG. 3, the pulley 10 is externally fitted to the tip of the drive shaft 13 and is configured to rotate integrally with the drive shaft 13. Yes.

  As shown in FIG. 2, the two sets of belt units 20 </ b> A and 20 </ b> B are arranged so that the respective belts 12 intersect each other. Each belt 12 is mainly a rubber belt and has flexibility and elasticity. Of these two sets of belt units 20A and 20B, one belt unit 20A is fixed to a support body (not shown), and the other belt unit 20B swings around the support body with the drive shaft 13 as a fulcrum. It is supported freely. Further, the belt 12 of the swing side belt unit 20B is urged by air pressure toward the belt 12 of the fixed side belt unit 20A, and a predetermined contact pressure is applied to the yarn Y passing between the belts 12. Then, the yarn Y is nipped at the intersection of the belts 12. In the two sets of belt units 20A and 20B, when the belt 12 is driven by the driving pulley 10 respectively, twist is applied to the yarn Y nipped by the intersecting portion of the belt 12, and the yarn Y is downstream (see FIG. 2 (under the above-mentioned patent documents 1 and 2).

  By the way, in such a nip type false twisting device 104, the twist angle of the yarn Y becomes unstable particularly when false twisting is performed with a relatively small contact pressure, such as when false twisting is performed on a thin yarn. Cheap. For example, even if the pressure (air pressure) that urges the belt 12 of the swinging belt unit 20B toward the belt 12 of the stationary belt unit 20A is fixed to a predetermined setting value, this setting value is small. In this case, the influence of the apparatus error or the influence of factors such as vibration and deflection of the belt 12 on the contact pressure cannot be ignored, and the contact pressure (effective contact pressure) actually applied to the yarn Y tends to vary. Thus, when the effective contact pressure varies, the mutual movement between the filament located on the inner side and the filament located on the outer side when the twist is applied, that is, interlayer movement (migration) becomes unstable. Then, the twist angles differ between the plurality of filaments constituting the yarn, and the filament length per unit length of the yarn varies between the plurality of filaments. For this reason, filament breakage is likely to occur when tension is applied after being sent out from the false twisting device 104, and as a result, more fluff is generated. Further, the thinner the yarn Y, the more easily the belts 12 that nip the yarn Y come into contact with each other, and there is a problem that the life of the belt 12 is shortened due to the wear.

  Therefore, as shown in FIGS. 2 and 3, in the false twisting device 104 of the present embodiment, two endless belts 12 are wound in parallel on a pair of pulleys 10 and 11 of each belt unit 20. It has been. Therefore, as shown in FIGS. 2 and 4, one belt 12 of the belt unit 20A is in contact with the two belts 12 of the belt unit 20B, and the other belt 12 of the belt unit 20A is also a belt. It is in contact with the two belts 12 of the unit 20B. That is, as shown in FIG. 4, the two belts 12 of each belt unit 20 are in contact with each other at all four hatched portions. In addition, when a thin thread is nipped by the belt 12, the belt 12 of each belt unit 20 comes into contact with the entire hatched portion in FIG. 4, but when a thick thread is nipped, the belt 12 of each belt unit 20 is , Partial contact. As shown in FIG. 3, on the outer peripheral surfaces of the pulleys 10 and 11, two annular curved surface portions 15 (crowning) projecting outward are arranged in the length direction (axial direction: left and right direction in FIG. 3). Is formed. Two belts 12 are respectively wound around the two annular curved surface portions 15, and the two belts 12 are not easily displaced in the length direction of the pulleys 10 and 11.

  As described above, the two belts 12 are wound around the pair of pulleys 10 and 11, so that the force for urging the swing-side belt 12 to the fixed-side belt 12 is increased in parallel. Since the belt 12 is evenly distributed, the effective contact pressure can be reduced. More specifically, as shown in FIG. 4, compared to a case where one belt 12 is wound around a pair of pulleys 10 and 11, as shown in FIG. If the (shaded portion) is quadrupled and the pressing force of the belt 12 is the same, the surface pressure is ¼. On the other hand, compared to a case where one belt 12 is wound around a pair of pulleys 10 and 11, in the present embodiment, two belts 12 are wound around a pair of pulleys 10 and 11. Therefore, the nip length (the length of the nip portion of the yarn Y) is doubled. That is, the effective contact pressure acting on the yarn Y is ½ times. Accordingly, the set value of the air pressure for urging the belt 12 is set to a value that is somewhat large so that the influence of factors such as device errors on the effective contact pressure can be ignored, and a small contact with the yarn Y. It is possible to apply pressure. In addition, since the effective contact pressure is reduced, wear caused by the contact between both belts 12 is also suppressed, so that the life of the belt 12 is improved. Further, when the two belts 12 are wound around the pulleys 10 and 11, the belt 12 is less likely to warp than the case where the number of the belts 12 is one.

  Furthermore, one groove 12a extending along the longitudinal direction of the belt is formed on the surface of each belt 12, and the surface of the endless belt 12 in contact with the yarn Y is divided by the groove 12a.

  In this way, since the surfaces of the two belts 12 wound around the pair of pulleys 10 and 11 are divided by the grooves 12a, the yarn Y is rotated four times when passing through the false twisting device 104. It will be divided into nips. That is, since the twist is applied to the yarn Y in four times, the interlayer movement (migration) of the filament is stabilized and the twist angle for each filament becomes constant. Then, since the variation in the length of the filament per unit length of the yarn becomes small and the filament breakage hardly occurs, the occurrence of fluff is suppressed. Further, when the twist angle is constant, the propagation of the twist is stabilized, so that the processing limit speed is increased and the productivity is improved.

  As shown in FIGS. 2 and 3, the groove 12 a is formed at the center of the belt 12 in the width direction. The two belts 12 wound around the pulleys 10 and 11 are arranged close to each other.

  Here, the number of the belts 12 wound around the pair of pulleys 10 and 11 is not limited to two, and even if three or more belts 12 are wound within the allowable range in design. Good. Further, the number of grooves 12a provided in each belt 12 can be appropriately changed within the design range. Furthermore, although the groove 12a shown in FIG. 3 is a V-shaped groove, it may be a groove having another shape such as a U-shaped groove or a square groove.

  It is possible to realize the four nips of the yarn Y as described above by winding four belts without grooves around the pair of pulleys 10 and 11. However, if the width of each belt is too narrow, the gripping force of the belt by the pulleys 10 and 11 becomes small, and the vibration of the belt becomes large. Therefore, if the number of windings is increased while increasing the width of each belt, the power consumption of the motor when the drive pulley 10 is driven to rotate becomes very large. From such a viewpoint, the number of the belts 12 wound around the pair of pulleys 10 and 11 is an appropriate number (for example, about two) in consideration of ensuring the reliable operation of the false twisting device 104 and running cost. In order to increase the number of nips, it is most preferable that the grooves 12a are formed in each belt 12.

  While the false twisting device 104 configured as described above can expand the processing range (the range of the thickness of the thread that can be processed) and can greatly reduce the occurrence of fluff, The false twisting machine 100 of the embodiment has a configuration for further suppressing the generation of fluff. This configuration will be described in detail below.

  As shown in FIG. 5, when the yarn tension on the upstream side of the false twisting device 104 is the twisting tension T1, and the yarn tension on the downstream side of the false twisting device 104 is the untwisting tension T2, the ratio T2 / T1 is generally called a K value, and this K value is an important factor that determines the physical properties and quality of the yarn. As the K value is larger, the untwisting tension T2 is larger and filament breakage is more likely to occur, so that the occurrence of fluff increases. Therefore, in order to suppress the occurrence of fluff, it is effective to lower the K value. However, if the K value is lowered, the yarn twisted by the false twisting device 104 is not sufficiently untwisted downstream. Then, untwisting occurs to cause problems such as a reduction in the crimpability of the yarn or an increase in the residual torque of the yarn, resulting in a reduction in yarn quality. Therefore, it is preferable to suppress the occurrence of fluff without lowering the K value.

  By the way, as shown in FIG. 1, the yarn twisted by the false twisting device 104 is untwisted in a section between the false twisting device 104 and the second feed roller 111 that holds and sends the yarn. Here, as shown in FIG. 5, the position (untwisting point) at which the yarn Y begins to open varies depending on the K value (T2 / T1). That is, the untwisting point approaches the false twisting device 104 as the K value increases, while the untwisting point moves away from the false twisting device 104 as the K value decreases. However, actually, members that are resistances on the yarn path such as various guides and tension sensors are arranged between the false twisting device 104 and the second feed roller 111. Twist points tend to be unstable. And in the state where this untwisting point is unstable, since it becomes easy to produce dispersion | variation in the length and untwisting tension of a filament, fluff increases.

  Therefore, in the false twisting machine 100 of the present embodiment, as shown in FIG. 6, the yarn rotated as the yarn Y travels on the downstream side of the false twisting device 104 and is fed from the false twisting device 104. A twist stop guide 107 is arranged to prevent the Y twist from propagating downstream. Here, there is no resistor in contact with the yarn such as a guide between the false twisting device 104 and the anti-twisting guide 107, and the yarn Y twisted by the false twisting device 104 is directly wound around the anti-twisting guide 107. It is done.

  As shown in FIGS. 7 and 8, the anti-twisting guide 107 includes two rotating disks 30 that are rotatably supported by the rotating shaft 31 via bearings 32 in a state of being opposed to each other. A large number of blade pieces 33 are provided radially at the circumferentially equidistant positions of the outer peripheral portion on one surface side of each turntable 30 (the face side facing the other turntable 30). The edge of each blade piece 33 has a shape that is gently inclined from the tip to the base end, and the base end portion of each blade piece 33 protrudes toward the other rotating disk 30. A portion 34 is formed.

  The two rotary disks 30 are connected by a plurality of bolts 35 in a state where the blade pieces 33 face each other. In this state, as shown in FIG. 9, the blade pieces 33 of the two rotary disks 30 are alternately arranged in the circumferential direction of the rotary disk 30. In a state where the yarn Y is wound between the two rotary disks 30, the yarn Y is zigzag in side view along the edges 36 of the plurality of blade pieces 33 of the two rotary disks 30. Move to the shape. At this time, when the yarn Y comes into contact with a large number of blade pieces 33, the propagation of the twist is suppressed, and the yarn Y after passing through the twist-stop guide 107 becomes untwisted.

  As described above, the twist prevention guide 107 prevents the twist of the yarn Y applied by the false twisting device 104 from propagating to the downstream side. Then, since the untwisting point of the yarn Y is fixed and stabilized at the position of the anti-twisting guide 107 on the downstream side of the false twisting device 104, generation of fluff is suppressed.

  In order to more reliably suppress the propagation of the twist of the yarn Y, as shown in FIG. 6, it is necessary that the winding angle of the yarn on the twist stop guide 107 is a certain size. Therefore, in the present embodiment, a guide roller 108 that is driven to rotate as the yarn Y travels is provided on the downstream side of the false twisting device 104, and the guide roller 108 allows the yarn on the downstream side of the false twisting device 104. The path is changed so that the winding angle θ of the yarn Y around the twist-stop guide 107 is secured to a predetermined angle (for example, 45 degrees) or more. However, if the winding angle around the twist stop guide 107 can be set to a predetermined angle or more by devising the arrangement of various guides, the second feed roller 111, etc. on the downstream side of the false twisting device 104, the guide roller 108 is not necessary.

  The twist guide 107 is not limited to the structure shown in FIGS. 7 to 9, and can be driven to rotate as the yarn Y travels and can suppress the twist propagation of the yarn Y. If it exists, it may have a structure other than this. Moreover, the twist prevention guide 107 can use the thing made from steel, ceramics etc., for example, However, It is not limited to the thing of these materials.

  According to the false twisting device 104 described above, since the two belts 12 are wound around the pair of pulleys 10 and 11, the nip length becomes long. By increasing the nip length in this way, the contact pressure (effective contact pressure) actually acting on the yarn Y is reduced, and thin yarn can be processed. Further, by increasing the nip length, the twisting torque applied to the yarn can be increased, and the processing range of thick yarn is further widened.

  Further, since the surface of each belt 12 is divided by the grooves 12a extending in the belt longitudinal direction, one yarn Y is nipped in four times, and the yarn Y is twisted at a plurality of locations. When dispersed, the twist angle of each filament can be made constant and the propagation of twist can be stabilized.

  Therefore, the present invention has been applied particularly in situations where fluff is likely to occur, such as when false twisting is performed on thin yarns or yarns with a large number of filaments, or when false twisting is performed in a region having a high K value. In some cases, the effect is particularly high. Further, when air is jetted from the interlace nozzle 105 (see FIG. 1) to impart convergence to the yarn, fluff is likely to occur, which is particularly suitable for such a case.

  In addition, when false twisting is applied to a relatively thick yarn, as in the conventional nip type false twisting device, the yarn can be niped while applying a large contact pressure to the yarn, and the twist can be reliably applied. it can. In other words, the present invention does not impair the advantage over the friction twister type.

Next, more specific examples of the present invention will be described together with comparative examples.
First, in Example 1 and Comparative Examples 1 to 3 below, a relatively thin multifilament yarn having 120 dtex and 216 filaments was used. The number of fluff generated in the yarn after false twisting is performed on such a yarn by a false twisting device having the specifications shown in Table 1 and further converging is given to the yarn by an interlace nozzle. Was measured. In addition, the processing limit speed of false twisting was also examined.

  Example 1 is an example of false twisting by the nip type false twisting device of the present invention, and Comparative Examples 1 to 3 are examples of false twisting in which various conditions shown in Table 1 are changed with respect to Example 1. In Table 1, Nip indicates a nip type false twisting device as described above, while Friction indicates a friction twister type false twisting device.

  The configuration of the friction twister type false twisting device will be briefly described. As shown in FIG. 10, the false twisting device 304 includes a triaxial spindle 300 having a plurality of disk-shaped friction disks 301. The triaxial spindle 300 is arranged so that the position in contact with the thread on the circumferential surface of the friction disk 301 is located in a spiral shape (zigzag shape), and a number of friction disks that rotate with the triaxial spindle 300. A twist is imparted to the yarn Y while the yarn Y passes between 301 while contacting the peripheral surface. The disk 310 located on the most downstream side is called a guide disk, and the position of the yarn Y sent out from the false twisting device 304 is determined by the guide disk 310.

  Returning to Table 1, in the nip type false twisting device, the number of belts is the number of belts wound in parallel on a pair of pulleys, the belt width is the width of one belt, and the presence or absence of a belt groove is the number of belts. Whether or not grooves (see FIGS. 2 and 3) are formed on the surface is shown. In Example 1 and Comparative Examples 1 and 2, which use a nip type false twisting device, the set pressure of the air that urges one belt toward the other belt is 0.1 MPa (1.1 kg / cm 2). It is said.

  First, with respect to Example 1 and Comparative Example 1 using a nip type false twisting device and Comparative Example 3 using a friction twister type false twisting device, fluff with respect to K value (untwisting tension T2 / twisting tension T1) FIG. 11 is a graph showing the relationship between the numbers (the number of fluffs contained in a yarn having a length of 2000 m). In particular, regarding Example 1 and Comparative Examples 1 and 2 using a nip type false twisting device, similarly, a graph showing the relationship between the number of fluffs with respect to the K value is shown in FIG.

  11 and 12, in Example 1 in which two belts having a groove on a pair of pulleys are wound in parallel and the yarn is nipped four times, compared to Comparative Examples 1 and 2 in which the number of belts is one. Thus, it can be seen that the generation of fluff can be suppressed. Furthermore, in Example 1, fluff can be suppressed to the same extent as when a friction twister type false twisting device is used (Comparative Example 3).

  Next, regarding Example 1 and Comparative Examples 1 and 2 using a nip type false twisting device and Comparative Example 3 using a friction twister type false twisting device, the relationship between the twisting tension T1 and the processing limit speed SS FIG. 13 shows a graph of the above. As can be seen from FIG. 13, even in the case of a thin filament yarn, in Example 1, the twist angle is more stable than in the same nip type Comparative Example 1 and Comparative Example 2, so that the processing limit speed SS is about 50 to 100 m / It can be increased by min, and can be further increased to the same level as in the friction twister type comparative example 4.

In Example 4 and Comparative Example 4, the yarn strength and elongation were measured for 12 spindles, and the standard deviation was calculated to examine the degree of variation. The results are shown in Table 3.
Example 4 is the same as Example 1 except that a high multifilament yarn having 83 dtex and 144 filaments is used. Comparative Example 4 is the same as Comparative Example 1 except that the same yarn as in Example 4 was used.

  From Table 3, it can be seen that in Example 4, variations in yarn strength and elongation are smaller than in Comparative Example 4.

  Furthermore, it was also verified that the false twisting apparatus of Example 1 can process a wide range of yarns from 20d to 600d. For example, even when a multifilament yarn having a filament number of 20d and 24 filaments was processed for 18 hours by a 12-twist false twisting device, yarn breakage did not occur and no abnormality in tension occurred.

  Next, while using the nip type false twisting device of Example 1, the same investigation was performed when a twist stop guide as shown in FIG. 6 was further provided on the downstream side of the nip type false twisting device. It was.

  Specifically, when a high multifilament yarn having 83 dtex and 144 filaments is used and a twist guide is provided (Example 2), and when a twist guide is not provided (Example 3) The number of fluff was measured. In Example 2, a guide roller (see FIG. 6) is further provided in addition to the anti-twist guide, and the winding angle of the anti-twist guide is 90 degrees. Table 2 shows the results of measuring the number of fluff for these Examples 2 and 3.

As shown in Table 2, in Example 2 where the K value is substantially the same and the anti-twisting guide is provided, the number of fluffs is significantly reduced compared to Example 3 without the anti-twisting guide. It can be seen that the generation of fluff can be suppressed by suppressing the propagation of the twist by the twist prevention guide.
In addition, by experiment, the effect equivalent to Example 2 was acquired even if the winding angle to the anti-twist guide was 60 degree | times. Further, even if the winding angle was set to 45 degrees without a guide roller, an effect similar to that of Example 2 could be obtained.

  As described above, the embodiment in which the present invention is applied to the nip type false twisting device configured to nip the yarns by the belts arranged in an intersecting manner as shown in FIG. 2 has been described. However, the nip type false twisting device having another configuration is described. It is also possible to apply the present invention to the above.

  For example, in the above embodiment, both of the pair of yarn nip members that nip the yarn Y are endless belts, but one is an annular member provided on one surface of a rotatable disk. (Example of FIG. 14).

  The nip type false twisting device 204 shown in FIG. 14 is configured to simultaneously apply S twist and Z twist to the two yarns Y, respectively. That is, the false twisting device 204 includes a disk 41 that is rotatably supported via the rotating shaft 40 and two sets of belt units 42 that are disposed so as to sandwich the disk 41. An annular portion 46 made of an elastic material (rubber or the like) is provided on each edge of the disk 41. Each belt unit 42 includes a pair of pulleys 43 and 44 and an elastic and flexible belt 45 wound around the pair of pulleys 43 and 44. The pulleys are driven by driving means such as a motor. The belt 45 is configured to travel along the outer circumferences of the pulleys 43 and 44 when the rollers 43 and 44 are rotationally driven. The belt 45 is pressed against the disk 41 by air pressure.

  When the belt 45 is driven in the direction indicated by the arrow while the two yarns Y are sandwiched between the disk 41 and the belt 45 of the two sets of belt units 42, the annular portions on both sides of the disk 41 are driven. Two yarns Y are respectively nipped between the belt 46 and the belt 45 and twisted in opposite directions. That is, the S twist is applied to the yarn Y on one side of the disk 41, and the Z twist is applied to the yarn Y on the other side of the disk 41 at the same time.

  Here, two annular portions 46 are concentrically arranged on the disk 41, and two belts 45 are wound in parallel on a pair of pulleys 43 and 44 of each belt unit 42. The contact state between the two annular portions 46 and the two belts 45 is the same as in FIG. Therefore, similar to the nip type false twisting device in Fig. 2, the effective contact pressure is smaller than the belt pressing force and the nip length is longer, allowing the yarn to be processed in a wide range from thin to thick yarn. It becomes.

Further, a groove 46a is formed in the circumferential direction on the surface of each annular portion 46 in contact with the yarn, and a groove 45a extending in the length direction is formed on the surface of each belt 45 in contact with the yarn. The surface of the belt 45 is divided by grooves 46a and 45a. For this reason, the number of times that one yarn Y is nipped further increases, and all the filaments constituting the filament yarn can be evenly twisted, and the occurrence of fluff is suppressed.
According to the present embodiment, S and Z non-torque yarn processing can be performed. Since it is a double thread that is processed on the left and right sides of the disk, it is possible to process thicker threads.

FIG. 1 is a schematic configuration diagram of a drawing false twisting machine according to an embodiment of the present invention. FIG. 2 is a perspective view of the false twisting device. FIG. 3 is a cross-sectional view of the drive pulley with the belt wound thereon. FIG. 4 is a schematic plan view of the nip type false twisting device. FIG. 5 is a diagram illustrating the relationship between the K value (T2 / T1) and the untwisting point. FIG. 6 is a layout diagram of a false twisting device, a twist-stop guide, and a guide roller. FIG. 7 is a front view of the turntable of the anti-twist guide. FIG. 8 is a cross-sectional view of the anti-twist guide. FIG. 9 is a diagram illustrating a state of the yarn wound around the twist-stop guide. FIG. 10 is a front view of a friction twister type false twisting device. FIG. 11 is a graph showing the relationship between the K value and the number of fluff in Example 1 and Comparative Example 1 using a nip type false twisting device and Comparative Example 3 using a friction twister type false twisting device. FIG. 12 is a graph showing the relationship of the number of fluff to the K value in Example 1 and Comparative Examples 1 and 2 using a nip type false twisting device. FIG. 13 is a graph showing the relationship between twisting tension T1 and processing limit speed SS in Example 1 and Comparative Examples 1 to 3. FIG. 14 is a perspective view of a false twisting device according to a modified embodiment of the present embodiment.

Explanation of symbols

10,11 pulley
12 belts
12a groove
15 Annular curved surface
41 disc
45 belt
46 Annulus
45a / 46a groove
100 drawing false twisting machine
104,204 Nip type false twisting device

Claims (5)

In a nip type false twisting device that includes two yarn nip units, sandwiches a yarn between the two yarn nip units, and applies twist to the yarn.
Each of the yarn nip units has a plurality of yarn nip members, and the plurality of yarn nip members are arranged in parallel,
Furthermore, grooves that divide the surface in contact with the yarn are formed on the surface of each yarn nip member that contacts the yarn,
A nip type false twisting device. Each of the yarn nip units includes a pair of pulleys, and the yarn nip member is an endless belt wound around the pair of pulleys,
The endless belts are arranged so as to intersect with each other, and are configured to sandwich the yarn at the intersecting portion,
A plurality of the endless belts are wound around the pair of pulleys in parallel,
Furthermore, the surface which the endless belt contact | connects the thread | yarn is formed with the groove | channel extended along a belt longitudinal direction, The surface which the endless belt contact | connects the thread | yarn is divided | segmented by the said groove | channel. Nip type false twisting device. The nip type false twisting device according to claim 2, wherein two endless belts are wound in parallel on the pair of pulleys. 4. The nip type false twisting device according to claim 2, wherein a plurality of annular curved surfaces protruding outward are formed side by side in the axial direction on the outer peripheral surface of each pulley. 5. The yarn nip member of one yarn nip unit is an annular portion provided on at least one surface of a rotatable disk;
The yarn nip member of the other yarn nip unit is an endless belt wound around a pair of pulleys and facing the one surface of the disk and having flexibility and elasticity;
A plurality of the annular portions are arranged concentrically on the one surface of the disk, and a plurality of the endless belts are wound around the pair of pulleys in parallel.
Further, a groove is formed in the circumferential direction on the surface of each annular portion in contact with the yarn, and a groove extending in the length direction is formed on the surface of each endless belt in contact with the yarn. The nip type false twisting device according to 1.

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