JPS626010B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a friction false-twisting device for producing spunlike textured yarn by false-twisting yarn and at the same time raising it to give it fluff. The object of the present invention is to provide a friction false twisting device that can stably perform false twisting at a high level, simultaneously raise a large amount of short fluff, and raise the fluff without causing yarn breakage, and that can perform this processing at low cost. We aim to provide the following. BACKGROUND ART Various devices have been known for producing spunlike processed yarns by crimping and fluffing yarns. One method, as shown in Japanese Patent Publication No. 45-9143, involves applying false twist to the yarn using a false twisting spindle, and at the same time installing a rough friction body such as a grindstone in the twisting area. This is a crimping and raising processing device that applies fluff to the cloth. In such a device, the false twisting spindle and the raising grindstone are separate, and therefore each requires a drive motor. Furthermore, conventional existing false-twisting machines do not have the mechanical space to incorporate a grindstone and a motor through modification, and require additional modifications such as raising the height of the motor, resulting in high costs. Furthermore, the napping device disclosed in Japanese Patent Publication No. 19743/1974 integrates a frictional false-twisting device suitable for high-speed false-twisting and a napping cutter, and has the advantage of being capable of low-cost production. However, in such a device, in order to achieve a high level of false twisting, it is necessary to press the yarn against a friction disk mounted on a single axis at a considerably high yarn tension, and as a result, uneven twisting is likely to occur. , it also has the disadvantage of being easy to break. Furthermore, since it is necessary to press the yarn against the twisting friction disk with high tension, the yarn must also be pressed against the napping blade with high tension, and when the tension increases instantaneously for some reason, the yarn This has a fatal flaw in that it cuts not only the fibers in the surface layer but also the entire yarn, making it impossible to achieve a stable napping process. Furthermore, the proposed napping device has three shafts equipped with a plurality of friction discs, which are arranged in parallel so that the discs of each shaft partially overlap and intersect with each other, and are positioned along a spiral. Among frictional false-twisting devices, there is a frictional false-twisting device in which the yarn sliding contact surface of a friction disk is made rough so that the yarn can be raised. Such a triaxial frictional false twisting device has the advantage that sufficient false twisting can occur without pressing the yarn with unreasonably high tension. However, in this case, it is unreasonable to roughen the yarn contacting surface of the friction twisting body to perform both false twisting and raising, and it is difficult to make the surface of the friction body rough to obtain the required number of fuzz. The yarn slips on the friction body, making it impossible to impart sufficient false twist.On the other hand, in order to obtain a high level of twist, the surface of the friction body must be smooth, resulting in a lack of fuzz. It has the disadvantage that it cannot satisfy twisting and raising at the same time. In addition, if the surface of the friction body is made rough to raise the yarn, the twisting slip of the yarn on the surface of the friction body increases, which not only causes a decrease in the number of twists, but also causes slight fluctuations in yarn tension. This causes a change in the degree of yarn twisting slip, that is, a variation in the number of twists, which has the disadvantage of not only unevenness within the spindle but also making it extremely difficult to adjust the spindle spacing of a production machine consisting of multiple spindles. Furthermore, if the level of false twist imparted by the friction twisting body is low, the twisting of the threads on the friction surface will result in poor convergence, resulting in a problem that the fluff will become longer, making it impossible to obtain short fluff. be. As mentioned above, false twisting is performed at a high level and stably,
At the same time, it has been impossible to raise a large amount of short fluff, to raise the fluff without causing yarn breakage, and to carry out the processing at low cost. As a result of intensive research aimed at solving these drawbacks, the inventors have arrived at the present invention. That is, the present invention provides three or more shafts equipped with a plurality of disc friction bodies, which are arranged in parallel so that the discs of each shaft partially overlap and intersect with each other and are located along a spiral. The friction false twisting device includes a twisting friction body in which a plurality of disk friction bodies apply false twist to the yarn;
This is a friction false twisting device characterized by comprising a raised friction body that gives fluff to the yarn. The present invention will be explained below based on the drawings. FIG. 1 is a front view of the device of the present invention. In the figure, a bracket 1 is provided with three bearings 2, 3, and 4 at the apex positions of an approximately equilateral triangle, and a shaft 5, 6 and 7 are each rotatably supported.
A pulley 5a is formed at the lower end of the shaft 5, pulleys 6a, 6b and a driving wheel 8 are formed at the lower end of the shaft 6, and a pulley 7a is formed at the lower end of the shaft 7, and are integrally molded or fixed to the shaft. A power transmission member such as a timing belt 9 is connected between pulleys 5a and 6b, and similarly, a power transmission member such as a timing belt 9 is connected to pulley 6.
A transmission member such as a timing belt 10 is stretched between a and 7a. When the drive wheel 8 is pressed by the drive means such as the belt 11, the drive shaft 8 moves to the shaft 6.
Furthermore, shafts 5,
The rotational force is transmitted to each of the shafts 5, 6, and 7, and the shafts 5, 6, and 7 are rotated in the same direction. 12, 13, 14, 15, 16, 17, 18,
Reference numerals 19 and 20 denote disk friction bodies fixed to the shafts 5, 6, and 7, and these disk friction bodies are composed of a twisting friction body that falsely twists the yarn and a napping friction body that raises the yarn to give it fluff. In Fig. 1, as an example, 12, 16, 1
7, 18, 19, and 20 are twisted friction bodies without a raising action, and 13, 14, and 15 are raised friction bodies. The twisted friction body is made of a conventionally known high-friction material such as polyurethane, or a wear-resistant material such as ceramic or ceramic-coated metal, and its surface roughness is suitably 1 to 6S. By setting the surface roughness to 1 to 6S, it is possible to obtain almost the same twisting effect as a disc friction body made of a high friction material such as polyurethane, and it has a much longer life than a polyurethane friction body. However, the surface roughness
If it exceeds 6S, the twist of the yarn will slip on the thread contact surface of the friction body, making it difficult to obtain the required high level of twist. As the raised friction body, a rough disk friction body such as a rough disk formed or coated with aluminum oxide particles or a rough disk coated with diamond particles is used. The surface roughness of the raised friction body should be appropriate depending on the thickness of the yarn to be processed, the thickness of the single fiber, and the structure of the yarn, but the average particle size should be equivalent to 100 to 3000 meshes. 300 to 1000 meshes is suitable, and even more preferable effects can be obtained. If particles coarser than 100 mesh are used, the twist applied by the twisting friction body will be inhibited by the rough raised friction body surface, making it impossible to obtain the required level of false twist, and also causing yarn breakage. It becomes easier. Furthermore, if fine particles exceeding 3,000 meshes are used, the surface becomes smooth and a sufficient napping effect cannot be obtained. A plurality of disc friction bodies fixed to the three shafts 5, 6 and 7 are composed of a twisting friction body that falsely twists the yarn and a raising friction body that gives fluff to the yarn, respectively. It will have independent functions with respect to By dividing the functions of the disk friction body between the twisting friction body that exclusively performs twisting and the raised rough surface body that exclusively performs napping, it is possible to achieve the necessary high level of false twisting and to create a large amount of short fluff at the same time. It becomes like this. In other words, since a high level of false twist is applied by the twisting friction body, the fiber bundles are temporarily strongly focused by the twisting, and in this state, the fiber bundles can be rubbed and raised by the raised rough surface body. Short fluff is thus obtained. In addition, even if the surface of the raised friction body is roughened until a sufficient number of fluffs is obtained, the number of false twists will not decrease at all.
It is possible to attach as many sheets as necessary depending on the desired number of fuzz. The processed yarn thus produced has sufficient bulk (usually due to heat setting of the false twist) due to the high level of false twisting, and has many short fluffs. In the present invention, the plurality of disc friction bodies may include twisted friction bodies and raised rough surfaces, but
The last frictional body that comes into sliding contact with the yarn during processing is a twisted frictional body that does not have a raising effect. In the friction body where the yarn finally comes into sliding contact, the yarn is gathered by false twisting on the surface where the yarn is pressed against the surface, but the yarn begins to untwist at the part where it is about to leave the surface of the friction body. , the yarn loses its cohesiveness, and due to the added crimp, the constituent single fibers of the yarn become dispersed and swell. If the last friction that comes into contact at this time is a raised tracheal surface, the moment the thread is about to leave that surface, the single fibers that are about to disperse and swell will be pulled together by the particles of the tracheal surface. , resulting in long fluff. Moreover, if the degree of damage is too high, it may cause thread breakage. Therefore, it is preferable that the friction body with which the yarn comes into sliding contact last is a twisted friction body that does not have a raising effect. On the other hand, it is preferable that the friction body with which the yarn comes into sliding contact first is also a twisted friction body for another reason. That is, when the first friction body is a raised friction body, it is necessary to carefully set the position of the thread guide in front of it so that its contact length is as determined. If this happens, in a multi-spindle production machine, yarns with different numbers of fuzz will be produced between the spindles. To avoid this problem, if the first friction body is a twisted friction body, then by adjusting the mechanical arrangement of the attachment, the yarn is brought into contact with the raised friction body attached after the second friction body at a predetermined contact length. It becomes possible to do so. Furthermore, regarding the diameter relationship between the raised friction body and the twisted friction body, it is appropriate that the diameter of the former is equal to or less than the diameter of the latter. The brushed friction body is selected and installed depending on the thickness of the yarn to be processed, the thickness of the constituent single fibers, the structure of the yarn, and the number of fuzz to be obtained. If a plate is used, the twisting friction plate may impede the retroactivity of the twisted twists, and the number of twists retroactive to the heater section for twist setting may decrease. This requires particular attention when using a brushed friction material with a particle size coarser than 400 mesh. In order to avoid this problem, it is possible to solve the problem by setting the surface speed of the twisted friction body to a higher speed. This may cause problems. On the other hand, according to the present invention, by making the diameter of the raised friction body smaller than the diameter of the twisted friction body, the sliding contact angle of the thread on the rough surface is reduced.
The twisting resistance of the yarn is reduced accordingly, the twisting is no longer inhibited, and the above-mentioned problem is solved. In addition, the thickness T of the twisted friction disk is generally 5 to 10 mm.
And the radius of curvature R of the circular arc portion of the end face is 3/4 to 1 times the thickness T. It is preferable that the upper and lower surfaces of the friction disk and the arc portion of the end surface are smoothly connected by a radius of curvature r that is sufficiently smaller than the radius of curvature R. The diameter D of the friction disc is usually 40 to 55 mm.
It is preferable to set it as the range of. Furthermore, the thickness T' of the brushed friction disk is generally 5 to 10
mm, and the radius of curvature R' of the circular arc portion of the end face is 3/5 to 1 times the thickness T'. It is preferable that the upper and lower surfaces of the friction disk and the circular arc portion of the end surface are smoothly connected by a radius of curvature r' that is sufficiently smaller than the radius of curvature R'. The friction body disks constructed in this way are connected to the shafts 5 and 5, respectively.
6 and 7 so that the friction disks of each shaft partially overlap and cross each other. Here, the gap t between adjacent friction disks is usually maintained at 2.0 mm or less. If it exceeds this, the thread will become unstable and the thread will run 0.5mm.
If it is less than that, threading becomes difficult. On the other hand, the number of twisted friction bodies is greater than the number of raised friction bodies. If the number of twisting friction members is small, it will be difficult to obtain the necessary twist, and furthermore, the twisting of the yarn will be defeated by the slight inhibition of twisting due to the raising friction, and the false twist level will tend to drop. Such a problem can be solved by making the number of twisted friction members greater than the number of raised friction members. Furthermore, it is preferable that the number of twisted friction bodies is at least twice the number of raised friction bodies. In the false twisting and raising device constructed as described above, the yarn Y reaches the yarn guide 22 from the yarn guide 21 by sequentially sliding along the yarn path formed by overlapping and intersecting friction disks. Here, the thickness T of the twisted friction disk is made sufficiently thick, and the radius of curvature R of its end surface is
3/4 to 1 times the thickness T is sufficiently large, so the rotational speed at the point where the yarn Y reaches and leaves the friction disk, and the yarn Y is twisted at the maximum rotational speed. The difference between the rotational speed at the point where the twisting point is small, and almost uniform twisting in the yarn path direction is possible, and the thick twisting friction disk makes the twisting part long enough to prevent twisting from being retroactively inhibited by the raised friction body. It is possible to achieve even and high-level twisting by overcoming the
In addition, a processed yarn with high bulkiness can be obtained. still,
If the thickness of the twisting friction disk is too thin, the twisting will not be carried out sufficiently, and if it is too thick, resistance will occur in the direction of the yarn path and yarn breakage will occur easily. Furthermore, if the radius of curvature R of the end face becomes excessively large, the end face approaches a cylindrical cross section, and the twisting of the yarn is mainly performed at its arrival and departure points. Therefore, it is necessary to twist by overcoming the retrograde inhibition of twisting by the raised friction body. This results in a decrease in the bulk of the resulting processed yarn, and the fluff becomes long and untidy. Furthermore, if the R is too small, the speed difference between the arrival point of the yarn and the outermost part of the arcuate cross section becomes large, which tends to cause uneven twisting. Furthermore, considering the above points, it is possible to obtain a sufficiently high level of twisting, and in the case of the raised friction body, the thickness T′ of the disc is sufficiently thick, so that a sufficient amount of fluff can be obtained. In addition, the radius of curvature R' of the end face is set to 3/5 to 1 times the thickness T' in order to optimize the stress concentration on the surface in contact with the thread. Processing that does not cause problems with threads, etc. is possible. In addition, the thickness of the brushed friction body
If T' is too thick, the twist imparted by the twisting friction body will be inhibited, the bulk of the processed yarn will be reduced, and the fluff will become long. In addition, resistance in the direction of the yarn path increases and yarn breakage is likely to occur. On the other hand, if it is too thin, a sufficient napping effect cannot be obtained. Also, if the radius of curvature R′ of the end face is too large, the stress concentration on the surface in contact with the threading will be too small and sufficient fluffing effect will not be obtained, and conversely, if R′ is too small, the stress concentration on the surface in contact with the threading will Stress concentration is too large and thread breakage is likely to occur. FIG. 2 is a schematic diagram showing an example of applying the napping false twisting device of the present invention to the production of spunlike processed yarn, in which the raw yarn 23 passes through the yarn guide 24 and the tension adjustment device 25 and reaches the supply roller 26. , is supplied from the roller to the false twisting and crimp processing area. Yarn 2 in this area
3 is given false twist by the twisting and raising friction body 28, and this false twist is heat-fixed by the heater 27, and is then raised when passing through the twisting and raising friction body 28, and then untwisted, and then passed through the take-up roller 30. Rolled up into rolled cheese. In the present invention, synthetic filaments such as polyester, polyamide, etc., or acetate are mainly used as the raw yarn 23, but these can be processed not only singly but also in the form of mixed yarns or aligned yarns. Furthermore, from the viewpoint of producing spunlike textured yarns, it is preferable to subject yarns with the same type of atoms, such as polyester filament yarns, but with different degrees of elongation (for example, undrawn yarns and partially blended yarns) to the drawing, stretching, and false twisting process. . As described above, according to the present invention, false twisting can be carried out at a high level and stably, and at the same time, a large number of short fluffs can be created, and the fluff can be raised to prevent yarn breakage, and it can be compared with ordinary false twisted crimped yarn. It has the advantage that spunlike textured yarn can be produced at a low cost with almost no change. Furthermore, compared to a device in which the false twisting device and the raising device are separate, only a part of the disk of the friction false twisting device has a rough surface, and high-speed false twisting processing is possible. It has become possible to produce spunlike textured yarn at almost the same cost as normal false-twisted crimped yarn. The present invention will be explained below with reference to Examples. Example 1 An undrawn polyester filament (220 de/72 fils) with an elongation of 350% and a partially oriented polyester filament (115 de/36 fils) with an elongation of 120% were aligned and subjected to interlacing treatment (entanglement point 40
Using the raw yarn of 1000 g/m), drawing and raising processing was carried out using the false twisting device shown in FIG. Here, the apparatus shown in FIG. 1 was used for the false-twisting friction body 28 in FIG. 2, and as a comparative example, a friction false-twisting apparatus was used in which all the friction plates were used as friction plates for both false twisting and raising. The processing conditions for both Examples and Comparative Examples were a draw ratio of 1.55 times, a heater temperature of 200° C., a surface speed of the twisted and raised friction body: 700 m/min, and a yarn speed of 350 m/min. The results are shown in Table 1.

[Table] As is clear from the above table, according to the present invention,
A textured yarn with the required high twist level and with it a large number of short fluffs is obtained. Example 2 Using a device in which a false-twisted/raised friction body as shown in Fig. 1 is composed of a twisted friction disk and a raised friction disk, the arrangement of the friction plates is changed so that the friction body that comes into sliding contact last is raised. The effects of a twisted friction plate with no action and a raised friction body with a raised action were compared. That is, as in the embodiment shown in FIG. 1, the friction bodies 12, 16, 17, 18, 19, and 20 are twisted friction plates, and the friction bodies 13, 14, and 15 are raised friction plates; ,17,18,19
A comparison was made between the cases where 1 was used as a twisted friction plate and 13, 14, and 20 were used as raised friction plates. The raw yarn was interlaced using the usual method (40 entanglement points/m ) The yarn was drawn and false-twisted in the process shown in FIG. The processing conditions were as follows: Stretching ratio: 1.55 times Heater temperature: 200°C Surface speed of twisting/fleeting friction body: 700 m/min Yarn speed: 350 m/min. The results are shown in Table 2.

[Table] From the table above, when the friction plate on which the yarn comes into sliding contact at the end is a twisted friction plate (No. 5), the fluff length is shorter and the number of yarn breaks is shorter than when a raised friction plate is used. It can be seen that the amount decreases as well. Embodiment 3 Using a device consisting of a false twisted/raised friction body as shown in FIG. 1, consisting of a twisted friction body and a raised friction body, the friction plates were arranged as shown in FIG.
16, 17, 18, 19, 20 twisted friction plate, 1
Nos. 3, 14, and 15 were used as raised friction plates, and the effect of the diameter of the raised friction plates was studied. The diameter of the twisted friction plate was 50 mm, and the distance between the shafts 5, 6, and 7 was 39 mm. Also, the surface roughness of the twisted friction plate is
2S was used. The raw yarn was interlaced using the usual method (40 entanglement points/m ) The yarn was drawn and false-twisted in the process shown in FIG. The processing conditions were as follows: Stretching ratio: 1.56 times Heater temperature: 195°C Surface speed of twisting/fleeting friction body: 700 m/min Yarn speed: 350 m/min. The results are shown in Table 3.

[Table] As shown in the table above, when the diameter of the twisting friction body is 50 mm or smaller, false twisting occurs frequently, and the proportion of long fuzz is small, resulting in a good effect. This effect is particularly great when the surface of the brushed friction plate is rough. Example 4 Using a device in which a false-twisted/raised friction body as shown in Fig. 1 is composed of a twisted friction disk and a raised friction disk, the effect on the composition of the number of twisted friction plates and raised friction plates was evaluated. We considered this. As shown in Fig. 1, three friction plates are fixed to each of the shafts 5, 6, and 7, among which friction plates 12 and 20 are twisted friction plates, and 13
Initially, only 13 of the friction plates 1 to 19 was a raised friction plate, and the number of raised friction plates was increased one by one, such as 13 and 14, 13, 14, and 15. The combustion friction plate used had a surface roughness of 2S, and the brushed friction plate had a diamond coat with a roughness of 800 mesh. The raw yarn was interlaced using the usual method (42 entanglement points/m ) The yarn was drawn and false-twisted in the process shown in FIG. The processing conditions were as follows: Stretching ratio: 1.56 times Heater temperature: 210°C Surface speed of the twisted and raised friction body: 870 m/min Yarn speed: 450 m/min. The results are shown in Table 4.

[Table] As shown in the table above, when the number of twisted friction bodies is greater than the number of brushed friction plates, especially when the number is more than twice (No. 15 to 17), the number of false twists is large and the fluff length is Many of them are also short, and very good results can be obtained. Example 5 Using a device consisting of a false twist and raised friction body as shown in FIG. 1, consisting of a twisted friction body and a raised friction body,
The arrangement of the friction plates is as shown in FIG.
2, 16, 17, 18, 19, and 20 are twisted friction plates 13, 14, and 15 are brushed friction plates, and the thickness of each friction plate is T, T', and the radius of curvature of the arc cross section of the end face R, R' We investigated the effects of The diameter of each friction plate was 50 mm, and the distance between the shafts 5, 6, and 7 was 39 mm. The twisted friction body was made of ceramic with a surface roughness of 2S, and the raised friction plate was made of diamond coat with a roughness of 600 mesh. The raw yarn was interlaced using the usual method (40 entanglement points/m ) The yarn was drawn and false-twisted in the process shown in FIG. The processing conditions were as follows: Stretching ratio: 1.56 times Heater temperature: 200°C Surface speed of the twisted and raised friction body: 970 m/min Yarn speed: 500 m/min. The results are shown in Table 5.

[Table] As shown in the table above, the shapes of the twisted friction disk and brushed friction disk are T = 5 to 10 mm, T' = 5 to 10 mm, and R/T = 3/4.
~1, When R'/T' = 3/5 ~ 1 is satisfied at the same time (No. 21 ~ 25), good results can be obtained that simultaneously satisfy a higher level of false twist number, short length, and large number of fuzz. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the apparatus of the present invention. Moreover, FIG. 2 is a schematic diagram showing an example of the case where the apparatus of the present invention shown in FIG. 1 is applied to the production of spunlike textured yarn. In Fig. 1, 1: bracket, 2 to 4: bearing, 5 to 7: friction body fixing shaft, 5a: pulley, 6
a: pulley, 6b: pulley, 7a: pulley, 8: drive wheel, 9-10: timing belt,
11: Drive belt, 12: Twisted friction plate, 13-1
5: Brushed friction plate, 16-20: Twisted friction plate, 21
~22: Yarn guide, D: Diameter of twisted friction plate, T:
Thickness of twisted friction plate, R: radius of curvature of end face of twisted friction plate, T′: thickness of brushed friction plate, R′: radius of curvature of end face of brushed friction plate, t: distance between adjacent friction disks ,
Y: Yarn, In Fig. 2, 23: Original yarn, 24: Yarn guide, 25: Tension tensioning device, 26: Supply roller, 27: Heater, 28: Twisting/raising friction body,
29: Take-up roller, 30: Take-up roller, 31: Take-up cheese (processed yarn).

Claims (1)

[Scope of Claims] 1. Three or more shafts equipped with a plurality of disc friction bodies are arranged in parallel so that the discs of each shaft partially overlap and intersect with each other and are located along a spiral. In the single frictional false twisting device, a plurality of disk friction bodies are composed of a twisting friction body that applies only false twist to the yarn, and a napping friction body that gives fluff to the yarn, and furthermore, the yarn is A frictional false-twisting device characterized in that the frictional body that slides into contact with the frictional body is a twisting frictional body that does not have a napping action. 2. The friction false twisting device according to claim 1, wherein the diameter of the raised friction body is equal to or less than the diameter of the twisting friction body. 3. The twisted friction body disc has a thickness T of 5 to 10 mm, and the end face has an arcuate cross section with a radius of curvature R of 3/4 to 1 times the thickness T, and a raised friction body disc is used. has a thickness T' of 5 to 10 mm, and its end face is a circular arc cross section having a radius of curvature R' that is 3/5 to 1 times the thickness T'. friction false twisting device. 4. The friction false twisting device according to claim 1, wherein the number of twisting friction bodies is greater than the number of raised friction bodies.