JPS60126343A - Yarn friction false twisting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a friction false twisting device for producing false twisted yarns at high speed, stability, and good quality. Friction disks are superimposed and intersected with respect to the rotation axis of the 1! j! In the rubbed false twisting processing device, only one friction disk located at the yarn exit pressure is made of a material with excellent wear resistance, preferably solid ceramic, thereby preventing quality abnormalities that occur over time during processing of the friction disk. This invention relates to a friction false twisting device that prevents yarn breakage and makes it possible to apply stable false twist for a long time using the same friction disk.

Prior art In recent years, the rotational speed of the false-twisting spindle in the conventional pin type system has reached t, o o o, o o o r-, but this is considered the limit of this system7, and there is no need to further increase the speed. I can't hope for that.

However, the friction false twisting method, which was initially applied only to false twisting of fine denier yarn, was improved from the bush type to the disk type, and at the same time, high elastic materials such as polyurethane were used as the friction members of the friction false twisting device. Since then, wear-resistant materials such as ceramics have come into use, and the friction false twisting method for medium-thick denier yarn has reached the stage of practical use. There are two types of ceramics: solid ceramics and ceramic coatings, but the former has safety issues and is superior in wear resistance, but the solid ceramics are prone to scattering when broken.
Although the latter is inferior in terms of wear resistance, it has a thin film so there is no problem with scattering. In order to improve the drawbacks of solid ceramic and ceramic coating,
As seen in JP-A-88759, JP-A-52-1321/46, and JP-U-54-150542, various studies have been made on surface conditions, materials, #i manufacturing methods, etc.
These shortcomings have not yet been sufficiently improved. For this reason, solid ceramic is used when longevity is important, and ceramic coating is used when safety is more important than longevity, but it is hoped that a ceramic footing disc with a longer lifespan will be developed. When we investigated the causes of shortening the lifespan of ceramic coatings, we found that friction (twisting), which is composed of multiple components,
The disc is worn out, resulting in quality abnormalities.

It was found that problems such as thread breakage and fuzzing occurred.

In order to conduct a more detailed KA inspection, we looked at the friction condition of each friction disk from the friction disk at the yarn entrance to the friction disk at the yarn exit, and found that the one friction disk at the yarn exit wore the most. was confirmed to be in progress. On the other hand, in the case of solid ceramic, almost no wear was observed on the friction disk at the yarn exit, indicating that the material had a strong tendency to wear.

Object and Structure of the Invention The present invention aims to eliminate the deficiencies of the prior art as described above, and to provide a false-twisting device for obtaining false-twisted yarn with stable quality and high productivity. It consists of the following structure. That is, the present invention has the following features: 1. A yarn in which at least as many friction disks as the rotation shafts are arranged in sequence and in circulation around a plurality of rotation shafts that rotate in the same direction and are arranged substantially parallel to each other. The yarn false twisting device is characterized in that the welding portion of one friction disk located at the yarn exit is made of a material with better wear resistance than the welding portions of other friction disks. Frictional false twisting processing device for yarn.

2. In a yarn false twisting device in which friction disks are sequentially and circularly arranged around a plurality of rotating shafts that rotate in the same direction and are arranged approximately in parallel, One friction disk is made of solid ceramic, and the other friction disks are ceramic coated or embedded with wear-resistant particles, and the rotating shaft is supported on one side, with the one side supported on the yarn exit side. 3. A frictional false twisting device for yarn, characterized in that a plurality of friction disks are connected to a plurality of rotational shafts rotating in the same direction and arranged approximately in parallel, and a plurality of friction disks In a false twisting device for yarns arranged in a circular manner,
This is a yarn friction false twisting device characterized in that one friction disk located at the yarn outlet is made of solid ceramic, and a safety cover is provided on the solid ceramic friction disk.

Hereinafter, the present invention will be explained based on the drawings. FIG. 1 is a front view showing one example of the present invention. At rotation pressure, 11, 12.
Reference numeral 13 denotes three rotating shafts that are rotatably protruded from the bracket 20 in parallel so as to be located at the vertices of a triangle, and pulleys 14, 1 are attached to these rotating shafts 11, 12, and 13, respectively.
5, 16, and 17 are provided. A drive pulley 19 is attached to the lower end of the rotating shaft 11 and is connected to the drive belt 1B.

The drive of the belt 18 causes the pulley 19 to rotate, which is transmitted to the pulleys 15 and 16, which is then transmitted to the pulleys 14 and 17 connected by a timing belt, and the rotating shaft! 1,12.1
3 rotate in the same direction and at the same speed. Friction discs 1 to 1O are fixedly attached to the rotating shafts 11, 12, and 13 in such a manner that they overlap and intersect with each other. Three rotating shafts 11. ．． 12 and 13 are rotatably supported on one side through bearings 21, 22 and 23 provided on the bracket 20, respectively, and are arranged so that the side supporting the rotating shaft, that is, the side of the bearings 21 to 23 is the exit side of the yarn Y. ing.

Here, the friction disks 1 to 0 are arranged in a circular manner in the order of 4, 3, and 3 on the rotating shafts 11 to 13, respectively, and the friction disks 1 to 9 are in contact with the yarn. The yarn of the friction disk lO on the yarn exit side located at the lowest end is inserted with a ceramic coating (alumina, chromium oxide, etc.) or embedding of particles with excellent wear resistance. The strip contact portion is made of solid ceramic.

The friction disk 10 on the thread exit side is preferably made of solid ceramic, but any material may be used as long as it has better wear resistance than the other friction disks 1 to 9, such as synthetic rubber such as urethane. The other friction discs 1 to 9 may also be made of synthetic rubber, metal, ceramic, or any other suitable material.

As the solid ceramic, fired alumina (ceramics) is mainly used, but any material such as silicon carbide or silicon nitride can also be used. Further, the form may be entirely made of solid ceramic, or may be partially formed by fitting only the yarn splicing portion into the support.

In addition, when the friction disk 10 at the yarn outlet is made of solid ceramic, it is preferable to provide a safety cover 24 that surrounds the entire circumference or a part of the circumference of the friction disk 10, as will be described later.
Figure 1 (double-dashed line).

Effects and Effects In such a device, the yarn Y being processed enters through the friction disk 1 and exits through the friction disk 10 (at this time, the yarn Y is twisted up to the friction disk 10, The tension of the yarn at the exit of the friction disk IO is relatively high in the false twisting process, and the change from twisted to untwisted yarn occurs rapidly and instantaneously. Therefore, it is easily affected by the surface condition of the disk (friction disk 10 is the most important friction disk in the friction disk of the friction false twisting device in order to obtain stable quality and processing condition during high-speed processing. .

If a solid ceramic is attached to the friction disk 10, safety is a concern, but breakage of the solid ceramic often occurs when it comes into contact with an adjacent friction disk due to vibration of the rotating shaft.

The vibration of the rotating shaft is small on the side where the rotating shaft is gripped, and large on the opposite side. Most of the damage occurs at the parts where the deflection is large (discs 1 and 2°3 in Fig. 1). In this sense, the rotation shaft gripping side (the first
There is no particular problem when attaching it to the disk s in the figure (9.10). There are devices that grip the rotating shaft from both sides,
In this case, there is almost no core runout, so there is no need to worry about damage. In the case of a type in which solid ceramic is bonded to a base material other than solid ceramic, damage may occur due to defects in the bonded area in addition to center runout of the rotating shaft, so it is preferable to manufacture the disk only from solid ceramic. However, it has a great effect on increasing safety.Furthermore,
When only one solid ceramic plate is used, safety can be easily improved by protecting only one disc of the false twisting device with a safety cover. this is,
This is particularly effective when the yarn exit side is opposite to the rotating shaft support side.

The present invention is particularly effective at a false-twisting speed of 400 m/min or more, and the effect becomes more pronounced as the false-twisting speed increases. At 30'om/min or less, there is little wear on the disc, and even if wear progresses, the speed is low, so quality
The effect on machining condition is relatively small.

Looking at heating by a friction disk, in the case of solid ceramics and ceramic coatings, the false-twisted medium pressure yarn is pressed by the tension of the yarn itself against the surface of the friction disk, which is made up of countless minute irregularities, and the friction The protrusions on the disk surface protrude into the interior from the yarn surface, and the protrusions catch the yarn, which generates frictional force and heats it. For this reason,
The protrusions on the surface of the friction disk are important, and if the protrusions change due to wear or falling off, the heating power will be reduced.

When it comes to solid ceramics and ceramic coatings, the protrusions on the friction disk are more likely to change with kana, so the lifespan of the false-twisting device is generally shorter. When we investigated the lifespan in more detail, we found that in Figure 1, from friction disk 1 to friction disk 9, the yarn enters the friction disk with a twist in it, and leaves the friction disk with the thread still in a twisted state. Therefore, even if there is something with a changed protrusion in the friction disks 1 to 9, the twisting can be covered by other friction disks, which will affect quality, processing condition, etc. The impact is negligible (and does not pose any particular problem in terms of production).

In the friction disk 10 located at the other yarn exit, the twisted yarn enters and is untwisted the moment it exits, so unlike the friction disks 1 to 9, the friction disk surface Changes are directly related to quality abnormalities and poor processing conditions. In this case, quality abnormalities occur due to changes in the protrusions on the surface of the friction disk, resulting in a decrease in frictional force or unevenness in the frictional force within one friction disk.
This occurs due to tension fluctuations at the exit of the friction disk and fluctuations in the untwisting point. In addition to the importance of the friction disk surface at the yarn exit, the surface of this friction disk at the yarn exit changes more rapidly than other friction disks, making it difficult to change the surface. This is why ceramic installation is extremely effective.

The present invention has the same effect even when kite disks (for example, matte chrome-plated disks) having a smaller coefficient of friction than the friction disk are provided above and below the friction disk. In this case, the one friction disk located at the yarn outlet is the final friction disk excluding the kite disk.

The present invention can be applied to all thermoplastic synthetic fibers such as polyester, polyamide, and polyolefin.

Although the above description has mainly been given to examples of friction disks made of solid ceramic and coated ceramic, combinations of other materials are equally effective, and the present invention is not limited thereto.

As described above, according to the present invention, for example, when a material is composed only of ceramic coating, it has a lifespan of about half a year when processed at high speed and under harsh conditions. As a result, the product can be used for more than three years, the quality and processing conditions are stabilized, and the frequency of replacing the friction disks is greatly reduced.

Also, in the case of other materials, when only the friction disk on the yarn outlet side is made more wear resistant than the other materials, a remarkable effect can be obtained.

Example Polyethylene terephthalate yarn (225d/48f, spinning speed 3 s o o TL/min) was produced directly in the apparatus shown in Fig. 1.
A machining test was conducted under the following conditions using silk replacement for each friction disk drawing configuration. The results are shown in Table 1.

Conditions: Stretching ratio: River, 5. Machining speed...goon/
Minutes.

False twist heater length...2m.

False-twisting heater temperature: 230°C Frictional false-twisting device: 3-axis disc type, 10 friction discs In Table 1 f, level l is because all 10 friction discs are ceramic coated. After 0.5 years, one streak, one fuzz, and thread breakage button problems have occurred. 9th and 10th sheet of level l false twisting device
When the second disk (friction disk 9 and friction disk 0) was replaced, a good processed yarn was obtained. This is because the ninth friction disk 9, which has less wear, is installed at the yarn outlet.If a good friction disk is installed in this area, even if a worn disk is placed in the ninth position. This indicates that there is no problem. As an extreme example of this, as shown in Level 3, even if worn friction disks are inserted in the 1st to 9th disks, if the 10th disk located at the yarn exit is not worn, then the yarn is normal. processing is possible.

Level 4 is the disk structure of the present invention.FI'-1 As shown above, the 10th disk is made of solid ceramic, which has a strong abrasion resistance, resulting in stable quality over a long period of time.1. @ Haku with f-.

[Brief explanation of the drawing]

FIG. 1 is a front view of a false twisting device showing one example of the present invention. ]~9...Friction disk. 10...Friction disk located at the yarn outlet. 11-13...Rotating shaft, 21-23...Bearing. 24... Safety cover special fraud applicant Teijin Ltd.

Claims (1)

[Claims] (1) A thread in which a plurality of rotating shafts rotating in the same direction and arranged approximately in parallel are provided with at least as many friction disks as the rotating shafts, which are sequentially and circularly arranged around the rotating shafts. The yarn false twisting device is characterized in that the welding portion of one friction disk located at the yarn outlet is made of a material with better wear resistance than the welding portions of other friction disks. Frictional false twisting processing device for thread blinds. 2. The yarn friction false twisting device according to claim 1, wherein the welding portion of the one friction disk located at the yarn outlet is made of solid ceramic. 3. Claim 1, wherein the welding portion of one friction disk located at the yarn exit is made of solid ceramic, and the welding portion of the other friction disk is made of ceramic coating, synthetic rubber, or synthetic resin. A friction false twisting device for yarn as described in 2. 4゜ In a yarn false twisting device in which friction disks are sequentially and circularly arranged around a plurality of rotating shafts that rotate in the same direction and are arranged approximately in parallel, The one friction disk located is made of solid ceramic2.
The other part is a friction disk with ceramic coating or wear-resistant particles embedded therein, and the rotating shaft is supported on one side, and the shaft is configured on the one side support side or the yarn exit side. Frictional false twisting processing equipment. 58 In a yarn false twisting device in which a plurality of friction disks are sequentially and circularly arranged around a plurality of rotating shafts rotating in the same direction and arranged approximately in parallel, the yarn exit 1. A friction false twisting device for yarn, characterized in that one friction disk located at the top is made of solid ceramic, and a safety cover is provided on the solid ceramic friction disk.