JPH06173155A - Method for washing carbon yarn and device therefor - Google Patents

Abstract

PURPOSE:To enable high-speed washing by spraying yarn of carbon fiber with a cleaning solution while continuously transporting the yarn through a grooved roller also used as a yarn guide and dehydrating the yarn in vacuum. CONSTITUTION:Carbon yarn is subjected to surface treatment by electrolytic oxidation, introduced into a cleaning tank for supplying and replacing cleaning water successively or periodically and primarily washed to give hydrous yarn 12, which is continuously transported through a grooved roller 13 also used as a yarn guide revolving at the same peripheral speed as the transportation speed of the yarn along a yarn transportation path, sprayed with a cleaning solution 19 from a spraying nozzle 14 laid just above the roller 13 and cleaned. Then the yarn is dehydrated while being brought into contact with a vacuum dehydrating roller 18 having the surface wound with a filter medium 16 revolving at the same peripheral speed as the transportation speed of the yarn 12 at 60-180 degree contact angle. Plural pairs of cleaning devices comprising a combination of the grooved roller 13, the spraying nozzle 14 and a cleaning water tray 15 to receive the sprayed cleaning water 19 are arranged in series in a multiple stage to improve cleaning effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning and dehydrating a chemical solution after surface oxidation treatment in a yarn continuous conveyance type chemical solution surface treatment step in the production of carbon fiber. More specifically, the present invention relates to a method and apparatus for cleaning and dehydrating an electrolytic solution in an electrolytic oxidation surface treatment step.

[0002]

2. Description of the Related Art In a continuous fiber-conveying chemical liquid surface treatment process in the production of carbon fibers, carbon fiber bundles (hereinafter also referred to as yarns) before sizing treatment are easy to separate and defibrate. When it comes into contact with the transport guides in this state, it easily gets fluffed, which makes it difficult to handle. Therefore, a sizing treatment is applied at the end of the surface treatment process,
The fluffing is prevented by focusing the fiber bundle. In the electrolytic oxidation treatment performed before the sizing treatment and the cleaning treatment for removing the surplus chemical liquid after that, it is necessary to pay attention to yarn deterioration such as fluffing.

As a cleaning step after the oxidation treatment, however, the immersion type cleaning apparatus shown in FIG. 1 was used for cleaning.
That is, as shown in FIG. 1, in the immersion type cleaning device 1, the cleaning water 2 is continuously (or periodically) supplied from the upstream side so as not to damage the yarn 5, and the cleaning water 2 is successively overflowed and sent to the next chamber for replacement. Guide rollers 4 and 7 are disposed above and above the liquid surface of each chamber of the washing tank 3 to be used, and the liquid-containing yarn 5 is threaded and conveyed in order through these, and the yarn 5 is washed in the washing liquid of the washing tank 3. Cleaning was carried out by immersing it in the container at a relatively low speed.

However, in the above immersion type cleaning method,
Since the staying time of the yarn in the cleaning liquid is long, the cleaning speed per unit length of yarn in the cleaning liquid is slow, which necessitates a multi-stage treatment of the cleaning tank, which increases the number of guide rollers and the threading. The workability was poor as it became complicated. Further, since the number of contact rollers is large, even when the yarn is passed at a relatively low speed, it is not possible to sufficiently suppress the yarn flaws such as single yarn breakage and fluffing, which causes the yarn deterioration. Further, since the number of rollers is large, it is difficult to control the process tension, and there are many problems such as an obstacle to speeding up from the viewpoint of yarn transport controllability.

Further, as a dehydration method after the immersion type cleaning,
Conventionally, as shown in FIG. 1, the liquid level upper guide roller 4 on the pulling side of the immersion yarn of the final stage cleaning tank 3 of the immersion type cleaning device.
In addition to the method of combining the nip roller 6 with the nip roller 6 to squeeze the liquid content under the roller pressure for dehydration, a method of pressing the liquid-containing thread against the squeezing roller rotating at the same peripheral speed as the thread conveying speed, or There are methods such as draining with an air blow nozzle, but in both cases, the yarn liquid content cannot be reduced to 70% or less, the drying load in the post process becomes large, and the yarn deteriorates under mechanical pressure. Because of the large quality,
There were problems such as many restrictions in terms of productivity.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce contact with conveyance guides when washing a chemical solution after electrolytic oxidation surface treatment in a yarn continuous conveyance type chemical solution surface treatment step. (EN) Provided are a yarn cleaning method and a device having a high washing rate per unit length of yarn, a multi-stage treatment of a washing tank is unnecessary, a small number of guide rollers, easy threading, and good workability. .

Another object of the present invention is to reduce the number of contact rollers when cleaning the chemical solution after electrolytic oxidation surface treatment, to prevent yarn deterioration such as single yarn breakage and fluffing, and to reduce the number of rollers and process tension. (EN) Provided are a yarn cleaning method and a device thereof, which are easy to control and easy to speed up in terms of controllability of yarn transportation.

Still another object of the present invention is to wash the chemical liquid after the electrolytic oxidation surface treatment and then to dry the chemical liquid, by pressing the liquid-containing yarn against a roller and without performing dehydration under the pressure thereof. The present invention provides a yarn washing method and a device therefor capable of reducing the liquid content to 70% or less.

[0009]

Means for Solving the Problems The inventors of the present invention have earnestly studied a method and apparatus for cleaning and dehydrating liquid-containing yarn after surface oxidation treatment in the production of carbon fiber. In place of the mold washing tank, thread is passed linearly on the grooved roller without bending, and the washing water is sprayed in the form of a film directly on the upper part of the roller, and the spray pressure is used to properly form the yarn. By defibrating it, it can quickly penetrate into the inside of the yarn and wash it, and after passing the yarn under the spraying, contact the filter cloth rotating at the same peripheral speed as the yarn with the vacuum suction dewatering roller wound on the roller surface. As a result, the inventors have learned that the above objects can be achieved, and have completed the present invention based on this finding.

That is, an object of the present invention is to provide the groove portion of the grooved roller, which also functions as a yarn guide rotating at the same peripheral speed as the yarn conveying speed, at the lower portion of the yarn conveying path, and to contain the liquid in the groove portion. A method for cleaning a carbon fiber, characterized in that a yarn is continuously conveyed, and washing water is sprayed from above onto the yarn in the groove of the roller from a spray nozzle provided directly above the roller (1). ) Can be achieved.

Another object of the present invention is to provide the groove portion of the grooved roller, which also functions as a yarn guide, which rotates at the same peripheral speed as the yarn conveying speed, at a position below the yarn conveying path, and to preliminarily wash water in the groove portion. Is continuously or periodically supplied and dipped into the liquid in the cleaning tank to carry the primary cleaning to continuously convey the liquid-containing yarn, and the roller groove portion is provided from the spray nozzle provided directly above the roller. It can be achieved by the method (2) for cleaning carbon fibers, which comprises cleaning the yarn by spraying cleaning water from above.

A further object of the present invention is to vacuum suction dewater the wound yarn, which has been washed by the above-mentioned yarn washing method (1) or (2), around a roller surface with a filter medium rotating at the same peripheral speed as the yarn conveying speed. This can be achieved by a carbon fiber cleaning method characterized in that the roller is dehydrated while being bent and conveyed at a contact angle of 60 to 180 °.

Another object of the present invention is also to serve as a yarn guide which is arranged at the lower part of the yarn passing route for a liquid-containing yarn which is continuously conveyed and which rotates at the same peripheral speed as the yarn conveying speed. And a grooved roller and a spray nozzle for spraying cleaning water onto the upper part of the liquid-containing yarn provided immediately above the roller in at least one stage. can do.

Another object of the present invention is to add at least one step of a washing tank as a pre-step for dipping and washing the liquid-containing yarn while supplying or substituting the washing water continuously or periodically and continuously. A grooved roller which is disposed below the threading and conveying path for the liquid-conveying yarn which is conveyed in a uniform manner and which also functions as a yarn guide and rotates at the same peripheral speed as the yarn conveying speed; A washing tank for continuously or periodically supplying and replacing the washing water to a device having at least one stage of a spray nozzle for spraying the washing water to the upper part of the liquid-containing yarn, and a liquid surface upper part of the washing tank and A guide device disposed in the liquid, and at least one stage of a cleaning device, in which liquid-containing yarns that are continuously conveyed to the roller are sequentially conveyed, are added as a pre-process. Achieved with a carbon fiber cleaning device (2) characterized by Rukoto can.

Still another object of the present invention is to provide the yarn washing device (1) or (2) and the yarn feeding speed for the yarns that are continuously fed by passing under the washing device. The surface of the roller is wound with a filter medium that rotates at the same peripheral speed as the
This can be achieved by a carbon fiber cleaning device characterized by being combined with a vacuum suction dehydration roller that is bent and conveyed at a contact angle of 80 ° to dehydrate.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic plan view showing an embodiment of a carbon fiber cleaning apparatus for carrying out the carbon fiber cleaning method according to the present invention, and FIG. 3 is a schematic view taken along line III--III of FIG. FIG. 4 is a sectional view, and FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 2.

2 to 4, the carbon fiber cleaning apparatus 11 of the present invention shows that the carbon fiber is surface-treated, for example, electrolytically oxidized, and then the liquid-containing yarn 12 that is continuously conveyed is passed. The cleaning water is sprayed on the grooved roller 13 which is arranged at the lower part of the conveying path and which also functions as a yarn guide which rotates at the same peripheral speed as the yarn conveying speed, and on the upper part of the liquid-containing yarn 12 provided immediately above the roller. And a cleaning liquid tray 15 for receiving the sprayed cleaning liquid.

As described above, the cleaning device including the grooved roller 13, the spray nozzle 14 provided immediately above the roller 13 and the cleaning liquid tray 15 for receiving the sprayed cleaning liquid is composed of at least one set. Yes, but Figures 2-3
It is preferable to use a plurality of sets of devices arranged in series as shown in FIG.

Before the at least one set of the cleaning apparatus of the present invention as described above, a conventionally used immersion type cleaning apparatus may be connected and used (not shown).

The required number of stages of such a device, the combination of different types of devices, etc. are appropriately determined on the basis of the conveying speed, the yarn diameter, the required cleaning degree, and the like.

Further, the yarn washed by the apparatus is continuously conveyed and the filter cloth 16 rotating at the same peripheral speed as the yarn conveying speed is wound around the surface of the hollow roller, and the yarn 12 is 60
It may be combined with a vacuum suction / dewatering roller 18 that causes the yarn to come into contact with the contact angle of ˜180 °, and uses the vacuum pump 17 communicating with the inside of the roller to suck the inside of the roller under vacuum.

Using this device 11, the liquid-containing yarn 12 is threaded and conveyed to each groove 20 of the grooved roller, and washing water is applied to the upper portion of the yarn 12 from the spray nozzle 14 provided directly above the roller 12. After spraying and cleaning the film, it is preferable that the yarn 12 is conveyed to the dehydrating roller 18 and bent to suck and dehydrate the cleaning liquid attached to the yarn 12.

The chemical liquid contained in the liquid-containing yarn of the present invention is a chemical liquid used for the surface treatment in the yarn continuous conveyance type chemical liquid surface treatment step in the production of carbon fiber, and more specifically, the surface in the electrolytic oxidation surface treatment step. It is an electrolytic solution used for the treatment, and examples thereof include salts such as ammonium nitrate, ammonium sulfate, and ammonium carbonate, and acids such as sulfuric acid, nitric acid, and phosphoric acid.

Further, in the grooved roller of the present invention which also functions as a yarn guide, when the liquid-containing yarn is passed through the bottom of the groove of the roller, the yarn protrudes from the groove due to the spray pressure of washing water, Any groove shape and size that does not cause a problem such as entanglement of the yarns may be used. For example, by forming a concave trapezoidal shape as shown in FIG. 4, the yarns are defibrated by the spray pressure of the cleaning water. When flattened, it spreads evenly on the bottom of the trapezoidal groove,
The inside of the yarn can be quickly washed.
The yarn conveying speed and the jetting flow rate are interrelated and can be appropriately determined based on factors such as the yarn diameter and the required number of stages of the cleaning device. For example, a yarn consisting of 10 μm × 3000 single fibers is When impregnated with an electrolytic solution having a chemical concentration of 4.0%, the yarn-conveying speed is 1 to 5 m / min and the ejection flow rate is 2.5 to 3 using only one stage of the spray-type cleaning device of the present invention.
Within the range of liters / min, the desired residual chemical concentration can be reduced to 100 ppm or less.

Further, it is desirable that the spray nozzle of the present invention is provided immediately above the support roller and sprays in a fan shape on the yarn running on the roller, because the cleaning liquid can be sprayed in a film shape and the cleaning efficiency can be improved. Further, the factors such as the shape of the spray nozzle, the diameter of the ejection port, the ejection speed, etc. are appropriately determined based on the diameter of the yarn to be used, the required cleaning degree, and the like. Further, the number of width direction nozzles at the time of conveying multiple yarns is appropriately determined by the number of yarns to be passed, and the spray angle of each nozzle is 2 to 5 in a direction perpendicular to the yarn conveying direction.
It is desirable to shift the angle by shifting the spray range and ensuring the uniformity of the cleaning effect in the width (roller axis) direction of one step.

If desired, the cleaning liquid of the present invention may be received by a tray for cascade processing.

Further, in the vacuum suction dewatering roller of the present invention, it is preferable that the water content of the yarn is 30 to 70%, preferably 30 to 40% because the drying load in the subsequent step can be reduced. Therefore, the contact angle of the yarn with respect to the roller and the degree of vacuum may be appropriately determined so that the water content of the yarn is the above, but the contact angle is usually 60 to 180 °, preferably 90 to 1
In the range of 80 °, the degree of vacuum is 500 to 600 mmH ₂ O,
It can be achieved preferably by setting it in the range of 550 to 600 mmH ₂ O. Further, the force applied to the yarn is only the pressing force to the roller due to the conveying tension even when the yarn is bent, and the deterioration of the yarn can be reduced without additional mechanical pressure such as the conventional nip roller. The filter material wound around the surface of the vacuum suction dewatering roller is not particularly limited, and various cloth materials or paper materials can be used.

In order to wash the carbon fibers by using such an apparatus, as shown in FIGS. 2 to 4, on the grooved rollers 13, 13, ... Which rotate at the same peripheral speed as the yarn conveying apparatus. The liquid-containing yarns 12, 12, ... Are passed through the yarn, and the cleaning liquid 19 is sprayed from the spray nozzle 14 provided at the upper portion. In the meantime, the yarn 12 is in contact with the grooved roller 13
Held in the groove 20 and fully contact with the cleaning liquid.

In the illustrated apparatus 11, the cleaning liquid 19
Is sprayed from the first spray nozzle 14 through the line 21 and comes into contact with the yarn 12, and then the first chamber 15 of the tray 15
a, and is sprayed from the chamber via the line 22 through the second spray nozzle 14. In this way, the cleaning liquid 19 that has come into contact with the yarn 12 is sequentially sent to the next spray nozzle 14 by the cleaning liquid pump 24 for cleaning, and is discharged from the final line 23 to the outside of the system.

When used in combination with the conventional immersion type cleaning device, the carbon fiber is cleaned by connecting before or after the device 11.

[0032]

EXAMPLES Next, examples of the present invention will be described.

Example 1 Black smoke treated carbon fibers were subjected to electrolytic oxidation surface treatment using a sulfuric acid aqueous solution, and liquid-containing yarns (14, 1) were applied using a five-stage type washing apparatus shown in FIGS. The diameter is 10 μm x 3000
A single fiber bundle 12 consisting of a book is fed to the yarn at a speed (5 m / m).
in) (not shown), the yarn is passed through each groove portion 20 of the grooved roller 13 rotating at the same peripheral speed, and the spray angle of each nozzle 14 is immediately above the roller 13 in a direction perpendicular to the yarn conveying direction. 5
The washing water 19 was sprayed onto the film at the upper part of the yarn at a jet flow rate of 3 liters / min from the spray nozzles that were staggered to wash the film. Then, the yarn is conveyed to a vacuum suction / dewatering roller 18 rotating at the same peripheral speed as the yarn conveying speed, and while being bent at a contact angle of 70 °, the cleaning liquid attached to the yarn is sucked and dehydrated with a vacuum degree of 550 mmH ₂ O. I went. The residual drug solution concentration of the thread after washing and dehydration was measured by liquid chromatography, and the obtained results are shown in FIG.

At this time, as the liquid-containing yarn, a yarn containing 2.69% of the electrolytic solution used in the electrolytic oxidation surface treatment step was used. Further, the cleaning liquid was received by the tray 15 and sequentially cascade-processed in the reverse direction of conveyance, and the cleaning waste liquid received by the final tray was sent to a waste liquid treatment step outside the system.

Example 2 A one-stage cleaning apparatus was used, in which the liquid-containing yarn was immersed in the liquid in the cleaning tank for continuously supplying and replacing the cleaning water at a yarn conveying speed of 5 m / min and a dipping time of 24 seconds / tank. Using a cleaning device that dips and conveys and cleans, and a liquid level upper guide roller on the pulling up side of the immersed yarn in the immersion type washing tank is used as a grooved roller that doubles as a yarn guide, After washing 5 units of the same apparatus as in Example 1 except that the speed was set to 5 m / min by connecting in five stages, suction dehydration was performed in the same manner as in Example 1. The residual drug solution concentration of the thread after washing and dehydration was measured by liquid chromatography, and the obtained results are shown in FIG.

At this time, as the liquid-containing yarn, a yarn containing 2.69% of the electrolytic solution used in the electrolytic oxidation surface treatment step was used. Further, the cleaning liquid from the spray nozzle was received in each stage of the cleaning tank instead of being received by the tray, and was sequentially cascade-processed in the reverse direction of conveyance, and the cleaning liquid received in the final cleaning tank was appropriately sent to the waste liquid treatment step.

Comparative Example 1 Using the 5-stage immersion type washing apparatus shown in FIG. 1, the liquid-containing yarn is fed into the liquid in the washing tank in which washing water is continuously supplied and replaced at a yarn conveying speed of 5 m / min. Immersion time was set to 24 seconds / tank, and after immersion, transportation and cleaning, suction dehydration was performed in the same manner as in Example 1. The residual drug solution concentration of the thread after washing and dehydration was measured by liquid chromatography, and the obtained results are shown in FIG.

At this time, as the liquid-containing yarn, a yarn containing 1.28% of the electrolytic solution used in the electrolytic oxidation surface treatment step was used. Further, the cleaning liquid was sequentially subjected to cascade processing in the reverse direction of conveyance, and the cleaning liquid in the final cleaning tank was appropriately sent to the waste liquid processing step.

From the results of FIG. 5, Example 1 and Example 2
Therefore, the sufficient cleaning effect is obtained in the first step, and depending on the set value of the allowable residual chemical liquid concentration during actual use, it may be possible to use only a single-step cleaning device without connecting in multiple steps. confirmed. In particular, in Example 2, there is no clear difference in the residual chemical concentration between the case of connecting in multiple stages and the case of only one stage.

Further, in visual inspection of the appearance of the yarn after dehydration,
The sample of Example 1 had the least number of thread defects, and subsequently, Comparative Example 1 and Example 2 showed substantially the same degree of deterioration due to thread defects.
However, it was also confirmed by visual inspection of the appearance of the yarn when the cleaning apparatus of Example 2 was used in only one stage, as in Example 1, there were few yarn flaws.

In each of Examples 1 and 2 and Comparative Example 1, the water content of the yarn after dehydration was about 40%, and it was confirmed that the dehydration was sufficient.

[0042]

According to the thread washing method used in the present invention,
Since there is little contact with the conveyance guides and linear threading is possible, equipment such as a washing tank and multi-stage processing are not required, reducing washing water, downsizing the device, and threading workability. It is easy to control the process tension and speed up the yarn transportation, and further, because the yarn can be appropriately defibrated by the spraying pressure of the cleaning liquid, the deterioration of the yarn, the cleaning degree and the cleaning speed, etc. can be improved. By drying, the external pressure on the yarn, the drying time, the drying speed, etc. can be greatly improved.

The grooved roller which also serves as the yarn guide of the yarn cleaning device used in the present invention is arranged at the lower part of the yarn passing route with respect to the liquid-containing yarn which is continuously conveyed, and the yarn conveying speed is It rotates at the same peripheral speed as. Therefore, the yarn can be linearly threaded, and the yarn passes through the bottom of the roller groove that also serves as a yarn guide. Therefore, most of the spray pressure from directly above the roller is at the bottom of the roller groove. The receiving and the damage to the yarns can be reduced, and a plurality of yarns can be simultaneously conveyed without being entangled with each other depending on the number of the groove portions. Further, since the threading resistance is small, it is possible to easily control the process tension, and it is possible to achieve speedup without any problem in terms of controllability of the yarn transfer.

The spray nozzle is provided directly above the grooved roller that also serves as the yarn guide, and sprays the washing water onto the upper part of the liquid-containing yarn. Therefore, the spray pressure is utilized to appropriately defibrate the yarn in the roller groove portion, so that the cleaning liquid quickly permeates into the inside of the yarn, and the cleaning power and the cleaning speed can be improved.

Further, the vacuum suction dewatering roller is combined with the above-mentioned yarn washing device, and after passing through the device, a filter cloth rotating at the same peripheral speed as the yarn conveying speed is wound around the roller surface, and the yarn is wound on the yarn. On the other hand, the yarn is contact-threaded at a contact angle of 60 to 180 °. Therefore, the liquid adhering to the yarn is quickly adsorbed on the filter cloth and dehydrated at the portion where the liquid-containing thread is bent and in contact with the filter material on the roller surface, and the liquid adsorbed on the filter cloth is When the roller makes one rotation, it penetrates into the filter cloth and is removed to the outside of the system by vacuum suction inside the roller. When the filter cloth makes one rotation and contacts the liquid-containing yarn again, The yarn water content is always 30 because it is returned to the dry state.
It can be reduced to a range of up to 70% and can be stabilized at an appropriate value.

[Brief description of drawings]

FIG. 1 is a schematic view showing an immersion type cleaning apparatus as one embodiment of a cleaning apparatus for carrying out a carbon fiber cleaning method according to a conventional invention.

FIG. 2 is a schematic plan view showing an embodiment of a cleaning apparatus for carrying out the carbon fiber cleaning method according to the present invention.

FIG. 3 is a schematic cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a schematic enlarged cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is a graph showing the concentration of residual chemical liquid contained in the yarn after washing and dehydrating carbon fiber as a test in the example of the present invention.

[Explanation of symbols]

1 ... Immersion type cleaning device 2 ... Cleaning water 3 ... Cleaning tank 4, 7 ... Guide roller 5 ... Liquid-containing yarn 6 ... Nip roller 11 ... Carbon fiber cleaning device 12 ... Liquid-containing yarn 13 ... Grooved roller 14 ... Spraying Nozzle 15 ... Cleaning liquid tray 16 ... Filter cloth 17 ... Vacuum pump 18 ... Vacuum suction / dewatering roller 19 ... Cleaning liquid 20 ... Roller groove 21, 22, 23 ... Line 24 ... Cleaning liquid pump

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication location D06L 1/20 7199-3B (72) Inventor Kunio Fukamachi 20-1 Shintomi, Futtsu-shi, Chiba Made in Shinnihon Steel Technology Co., Ltd. Technology Development Division, Facility Technology Center

Claims (6)

[Claims] 1. A grooved roller, which also functions as a yarn guide that rotates at the same peripheral speed as the yarn conveying speed, is provided at a position below the yarn conveying path, and a liquid-containing yarn is continuously provided in the groove. Transport
A method for cleaning carbon fibers, characterized in that cleaning water is sprayed from above onto the yarns of the roller groove portion from a spray nozzle provided directly above the roller. 2. The yarn according to claim 1, wherein the liquid-containing yarn is a yarn that has been preliminarily washed by immersing it in a liquid in a cleaning tank in which cleaning water is continuously or regularly supplied and replaced. Carbon fiber cleaning method. 3. A vacuum suction dewatering roller in which a yarn cleaned by the method for cleaning carbon fiber according to claim 1 or 2 is wound around a roller surface with a filter medium rotating at the same peripheral speed as the yarn conveying speed. A method for cleaning carbon fibers, which comprises dehydrating while bending and conveying at a contact angle of 60 to 180 °. 4. A grooved roller which is arranged at a lower portion of a yarn passing path for a liquid-containing yarn which is continuously conveyed and which also functions as a yarn guide and rotates at the same peripheral speed as the yarn conveying speed. A carbon fiber cleaning device characterized in that at least one stage of a spray nozzle for spraying cleaning water is provided on an upper portion of a liquid-containing yarn provided directly above the roller. 5. The cleaning water is continuously or regularly supplied,
A cleaning tank to be replaced, and a liquid level upper portion of the cleaning tank and a guide roller arranged in the liquid, and the liquid-containing yarns continuously conveyed to the roller are sequentially conveyed. The carbon fiber cleaning apparatus according to claim 4, wherein at least one cleaning apparatus is added as a pre-process. 6. The carbon fiber cleaning device according to claim 4 or 5, and the yarn continuously threaded under the cleaning device and conveyed continuously, is rotated at the same peripheral speed as the yarn conveying speed. A cleaning apparatus for carbon fibers, characterized in that the filter material is wound around a roller surface, and the yarn is bent and conveyed at a contact angle of 60 to 180 °, and is combined with a vacuum suction dehydration roller for dehydrating.