JPS5846129Y2 - Friction false twisting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a friction false twisting device for producing spunlike textured yarn by imparting false twist to a yarn and at the same time imparting fluff by raising it.

The purpose of this invention is to create a friction false twist that can stably perform false twisting at a high level, create a large number of short fluffs, and raise the fluff without causing yarn breakage, and that can be processed at low cost. The aim is to provide the equipment.

BACKGROUND ART Various devices have been known for producing spunlike processed yarns by crimping and fluffing yarns.

One of these methods, 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 heating area. This is a crimping and raising processing device that raises the hair and gives it fluff.

In such a device, the false twisting spindle and the raising grindstone are separate, and therefore each requires a drive motor.

Furthermore, general 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.

Further, the napping device disclosed in Japanese Patent Publication No. 19743/1974 integrates a frictional false-twisting device suitable for high-speed false-twisting processing and a napping cutter, and has the advantage of being able to be produced at low cost.

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 one axis at a considerably high yarn tension, which tends to cause uneven twisting. 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 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, in a friction false twisting device, three shafts equipped with a plurality of friction disks are installed in parallel so that the disks of each shaft partially overlap each other and are positioned along a spiral. A friction false-twisting device has been proposed in which the yarn sliding contact surface of a disk is roughened to enable yarn raising.

Such a three-axis 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 sliding contact surface of the friction twisting disk to perform both false twisting and raising, and the friction twisting disk must be If the circumferential surface is made rough, the yarn will slip on the friction disk, and sufficient false twist cannot be imparted.In order to obtain a high level of twist, it is necessary to make the circumferential surface of the friction disk smooth. However, this method has the disadvantage that it cannot satisfy both twisting and raising at the same time, such as the lack of fluff.

In addition, if the circumferential surface of the friction disk is made rough for napping, the twisting slip of the yarn on the circumferential surface 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 causes not only unevenness within the spindle but also the drawback that it is 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 disk is low, the twisting of the yarn 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. .

As described above, with conventional equipment, it is not possible to perform false twisting at a high level and stably, at the same time create a large number of short fluffs, raise the fluff without yarn breakage, and carry out the process at a low cost. It was impossible.

In order to solve this problem, the inventors of the present invention first installed three or more shafts with a plurality of friction disks,
In a friction false twisting device in which disks on each axis are partially overlapped and intersected with each other and are arranged parallel to each other so as to be located along a spiral, a twisting friction circle is used to false twist yarns using a plurality of friction disks. We proposed a friction false twisting device characterized by consisting of a plate and a raised friction disk that gives fluff to the yarn (Japanese Patent Application No. 53-58).
No. 10).

This friction false twisting device is suitable for producing spunlike processed yarn, but as a result of research to further improve its performance, by placing a yarn guide plate immediately upstream of the napping friction disk, A simple yarn guide setting makes it possible to equalize the degree of sliding contact with the nap friction disk, reducing variations in the number of fluffs and yarn strength, making it possible to produce spun-like textured yarn that is even better than before. We discovered this and arrived at the present invention.

That is, the present invention has three or more shafts equipped with a plurality of discs, the discs of each shaft partially overlap and intersect with each other,
In a friction false twisting device installed in parallel along a spiral, a plurality of discs are used: a twisting friction disc that applies only false twist to the yarn, and a raised friction disc that gives fluff to the yarn. , and a yarn guide disk provided immediately upstream of the yarn friction body, the number of twisted friction disks is larger than that of the raised friction disks, and the radius of curvature of the end surface of the raised friction disk is Thickness 31
5 to 1 times, and the diameter of the napping friction disk is 1/1.10 to 1/1.20 of the diameter of the twisting friction disk.

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, three bearings 2, 3, and 4 are installed on a bracket 1 at approximately apex positions of an equilateral triangle, and a shaft 5° is provided through the bearings 2, 3, and 4. 6 and 7 are each rotatably supported.

Boo IJ S a is attached to the lower end of shaft 5, and Boo I is attached to the lower end of shaft 6.
J6a, 6b, the drive wheel 8, and the pulley 7a at the lower end of the shaft 7 are each molded integrally with the shaft or fixed thereto.

A power transmission member such as a timing belt 9 is stretched between the pulleys 5a and 6b, and a power transmission member such as a timing belt 10 is similarly stretched between the pulleys 6a and 7a.

When the drive wheel 8 is pressed by a drive means such as a belt 11, it rotates from the drive shaft 8 to the shaft 6, and then from the pulleys 6a and 6b to the shafts 5 and 7 via the timing belts 9 and 10 and pulleys 5a and 7a, respectively. The force is transmitted and the shafts 5, 6.7 are rotated in the same direction.

13. 14, 15, 16, 17, 18. 19, and 20 are friction disks fixed to the shafts 5 and 6.7, and these friction disks serve as the twisting friction disks that apply false twist to the yarn and the yarn. In Fig. 1, as an example, 14, 15, 16, 17, 18, 19 and 20 are twisted friction disks that do not have a nap effect, and 13 is a nap friction disk. The case of a disk is shown.

Further, 12 is a yarn guide disk placed on the raised friction disk 13 on the most upstream side.

The threading surface of the twisting friction disk 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 the surface roughness thereof is suitably 1 to 6S.

As the raised friction disk, a rough friction disk whose tangent surface is formed of or coated with aluminum oxide particles, a rough surface coated with diamond particles, a rough surface coated with tungsten carbide particles, etc. is used.

The roughness of the tangent surface of the raised friction disk 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. In terms of size, a size equivalent to 100 to 3000 meshes is appropriate, and a more preferable effect can be obtained when the size is 300 to 1000 meshes.

The yarn guide disk 12 is made of metal with a surface roughness of about 3 to 7S on the weaping surface, and does not have a twisting action or a raising action on the yarn.

In the present invention, the plurality of friction disks fixed to the three shafts 5, 6, and 7 are composed of a twisting friction disk that applies false twist to the yarn and a raised friction disk that gives fluff to the yarn. and have independent functions regarding false twisting and raising, respectively.

By dividing the functions of the friction disk into a twisting friction disk that exclusively performs twisting and a napping friction disk that exclusively performs napping, it is possible to achieve the required high level of false twisting and to create a large amount of short fluff at the same time. become able to.

In other words, since a high level of false twist is applied by the twisting friction disk, the fiber bundle is temporarily strongly focused by the twisting, and in this state, it can be rubbed and raised by the brushing friction disk. Therefore, short fluff is obtained.

Furthermore, even if the surface of the raised friction disk is roughened until a sufficient number of fluffs is obtained, the number of false twists will not be reduced at all. ,
It is possible to attach as many sheets as necessary depending on the desired number of fuzz.

The textured yarn produced in this way has a sufficiently high quality due to the high level of false twisting (usually due to heat setting of the false twisting).

) and a lot of short fluff.

The arrangement order of the above-mentioned twisting friction disks and napping friction disks can be selected as appropriate, but during processing of the yarn, the disk that comes into sliding contact first is the yarn guide disk, and the disk that comes into sliding contact last is used for the raising action. Preferably, the twisted friction disc has no .

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 furthermore, due to the applied crimp, the constituent single fibers of the yarn become dispersed and swell.

If the last frictional body that comes into sliding contact at this time is a brushed tracheal surface, the moment the thread is about to leave that surface, the single fibers that are about to disperse and swell will be caught by the tracheal particles and become long. This will result in fuzz.

In addition, if the degree of damage exceeds this level, it may cause thread breakage.

Therefore, it is preferable that the friction body with which the yarn comes into sliding contact at the end is a twisted friction disk that does not have a raising effect.

On the other hand, it is preferable that the disk with which the yarn comes into sliding contact first is a yarn guide disk for another reason.

That is, when the first friction body is a raised friction disk, 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 production machine with multiple spindles, yarns with different numbers of fuzz will be produced between the spindles.

To avoid this problem, if you place the yarn guide disk just upstream of the first raised friction disk, the mechanical arrangement of the device will allow the raised friction disks to stick to the second and subsequent sheets. It becomes possible to bring the threads into contact with each other at a predetermined contact length.

Regarding the diameter of each disc, it is appropriate that the diameter of the raised friction disc is about 1/1.10 to 1/1.20 of the diameter of the twisting friction disc, and It is appropriate that the diameter of the plate is approximately 1.02 to 1.12 times the diameter of the raised friction disk.

In other words, the raised 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. When a rough friction disk is used, the twisting friction disk may obstruct the retroactivity of the twisted twist, and the number of twists retroactive to a part of the heater to be twisted may be reduced.

This requires particular attention when using a raised friction body 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, but this would cause the equipment originally used for high-speed machining to rotate even faster, which would cause other problems such as vibration. It may cause

However, the diameter of the raised friction body is 171 times the diameter of the twisted friction body.
．． By setting the ratio to 10 to 1/1.20, the sliding contact angle of the yarn on the rough surface is reduced, the winding resistance of the yarn is correspondingly reduced, and twisting is not inhibited, thereby solving the above-mentioned problem.

In addition, if the diameter of the yarn guide disk is made slightly larger than the diameter of the raised friction disk by 1.02 to 1.12 times, the sliding contact angle of the yarn with the raised friction disk becomes the most preferable range, and processing The strength and elongation of the yarn is optimized, and the appropriate number of fluffs is also ensured.

On the other hand, the thickness of the twisted friction disk is generally 5 to 1Q mm,
Moreover, it is preferable that the radius of curvature of the arcuate portion of the end face is 3/4 to 1 times the thickness.

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 that is sufficiently smaller than the radius of curvature.

It is preferable that the diameter of the friction disk is usually in the range of 40 to 55 mm.

Furthermore, the thickness of the brushed friction disk is generally 5 to 10 mm,
The radius of curvature of the arc portion of the end surface is preferably 315 to 1 times the thickness, and the distance between the upper and lower surfaces of the friction disk and the arc portion of the end surface has a radius of curvature that is sufficiently smaller than the radius of curvature. Preferably, they are connected smoothly by a radius.

Further, the thickness of the yarn guide disk is preferably 2 to 6 mm, and the number of twisted friction disks is greater than the number of raised friction disks.

If the number of twisting friction disks is small, it will be difficult to get the necessary twist, and furthermore, the twisting of the yarn will be defeated by the slight inhibition of twisting at the nap friction part, and the false twist level will tend to drop.

Such a problem can be solved by increasing the number of twisted friction disks to a greater number than the number of raised friction disks.

Furthermore, it is preferable that the number of twisting friction disks be at least twice the number of brushed friction disks. Although preferred, they may be provided at slight intervals or may be provided on other raised friction disks.

In the device of the present invention constructed as described above, the yarn Y reaches the yarn guide 22 by sliding sequentially from the yarn guide 21 through the yarn path formed by overlapping and intersecting each disk.

Here, since the thickness of the twisted friction disk is made sufficiently thick and the radius of curvature of the end face is made sufficiently large from 3/4 to 1 times the thickness, the yarn Y is The difference between the rotational speed at the point where the yarn reaches and leaves the yarn Y and the rotational speed at the point where the yarn Y is twisted at the maximum rotational speed is small, and almost uniform twisting in the yarn path direction is possible. Because the friction disk is thick, the twisting part is sufficiently long, so it is possible to overcome the twisting inhibition effect caused by the raised friction disk and perform even and high-level twisting, resulting in extremely uniform and high-quality twisting. Processed yarn can be obtained.

Note that if the thickness of the twisting friction disk is too thin, the twisting will not be done 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 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, twisting can overcome the retrospective inhibition of twisting by the raised friction disk. This tends to reduce the authenticity of the resulting processed yarn, and the fluff tends to be long and untidy.

Furthermore, if the radius of curvature of the end face of the twisting friction disk is too small, the speed difference between the arrival point of the yarn and the outermost part of the arcuate cross section will be large, and a twisted portion will easily occur.

Furthermore, in consideration of the above points, if a sufficiently high level of twisting is obtained, as for the raised friction disc, the thickness of the disc is sufficiently thick so that a sufficient number of fluffs can be obtained. It is possible to reduce the radius of curvature of the end face to 315% of the thickness.
Since the stress concentration on the surface in contact with the yarn is optimized by setting the yarn to 1 times as much, it is possible to achieve a sufficient napping effect and to perform processing that does not cause problems such as yarn breakage.

As described above, according to the present invention, it is possible to perform false twisting at a high level and stably, at the same time create a large number of short fluffs, raise the fluff without yarn breakage, and perform high-speed false twisting processing. It has the advantage that spunlike textured yarn can be produced at a low cost that is almost the same as that of ordinary false-twisted crimped yarn.

Furthermore, since the yarn guide plate is placed immediately upstream of the napping friction disk, it is possible to easily equalize the degree to which the yarn slides into sliding contact with the napping friction disk by simply adjusting the yarn guide. As a result, variations in the number of fuzz and yarn strength are reduced, and spun-like processed yarn with even better quality can be produced.

Examples Untwisted undrawn polyester multifilament (222 de/72 fil) with an elongation of 350% and untwisted partially oriented polyester multifilament (225 de/72 fil) with an elongation of 120%
de/48 fil) with an air turbulence nozzle.
Using raw yarn mixed and entangled so as to have an entanglement degree of 0 threads/m, drawing and simultaneous false twisting was performed under the following conditions using a friction false twisting device shown in FIG. 1 and having the following specifications.

At this time, the experiment was repeated using the discs in Table 1 as the discs in the friction false twisting device, and the results are shown in Table 2.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the friction false twisting device of the present invention. 1 nib bracket, 2-4: bearing, 5-7: friction body fixing shaft, 5a: pulley, 6a: pulley, 6b: pulley-1
7a: Pulley, 8: Drive wheel, 9-10: Timing belt, 11: Drive belt, 12: Yarn guide disk, 13
: Brushed friction disk, 14-20: Twisted friction disk, 21-2
2: Thread guide.

Claims (1)

[Scope of utility model registration request] In a friction false twisting device, three or more shafts equipped with a plurality of discs are provided in parallel so that the discs of each shaft partially overlap each other and are located along a spiral, A twisting friction disk that applies only false twist to the yarn, a napping friction disk that gives fluff to the yarn, and a yarn guide disk that is provided immediately upstream of the yarn friction body. The number of twisted friction disks is larger than that of the raised friction disks, and the radius of curvature of the end face of the raised friction disks is 315 to 1 times the thickness,
and the diameter of the raised friction disk is 1/1 of the diameter of the twisted friction disk.
A friction false twisting device characterized in that the twisting ratio is 1.10 to 1/1.20.