JP2001279536A - Apparatus for imparting entanglement to precursor fiber bundle for carbon fiber - Google Patents

Abstract

(57) [Summary] [Problem] To impart uniform and appropriate entanglement to a carbon fiber precursor fiber bundle in a longitudinal direction and a radial direction, to improve operation stability in a carbon fiber manufacturing process, and to open the fiber later. If necessary,
Provided is a confounding device that can provide confounding that can be easily opened. A confounding device (1) includes a fluid ejection chamber (3), and seal chambers (4, 5) of the fluid ejection chamber (3) before and after the fluid ejection chamber. The fluid ejection chamber (3) has two fluid ejection surfaces (3d) orthogonal to the traveling direction of the fiber bundle (F).
In d), six fluid ejection holes (3e) having a fluid ejection angle of 90 ° with respect to the running direction of the fiber bundle are arranged at equal intervals displaced by 60 °. In particular, it can be suitably used for a multifilament fiber bundle having a single fiber fineness of not less than 0.04 tex and not more than 0.4 tex and the number of the constituting single fibers is not less than 800 and not more than 100,000.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an entanglement device for converging a carbon fiber precursor fiber bundle, and more particularly, to imparting uniform entanglement to the fiber bundle in the longitudinal direction and the radial direction of the fiber bundle. Not only excellent convergence but also excellent spreadability,
The present invention relates to an apparatus for imparting entanglement to a carbon fiber precursor fiber bundle that ensures operation stability in a subsequent carbon fiber manufacturing process.

[0002]

2. Description of the Related Art Carbon fibers have excellent specific strength and specific elastic modulus as compared with other fibers, and have many excellent properties such as excellent specific resistance and high chemical resistance as compared with metals. Has characteristics,
Utilizing its excellent various properties, it is widely used in reinforcing fibers for composite materials with resins, other industrial uses, and also in the sports and aerospace fields.

[0003] In general, carbon fibers are obtained by oxidizing raw material fibers such as acrylonitrile fibers in an oxidizing atmosphere at 200 ° C or higher and then carbonizing them in an inert atmosphere at 300 ° C or higher.

In the above-mentioned flame-proofing step, in order to improve the processing efficiency and to save the space of the apparatus, a plurality of carbon fiber precursor fiber bundles are arranged in parallel at predetermined intervals in a sheet-like form and the flame-proofing is performed. While traveling in the furnace, the traveling fiber bundle is wrapped around a plurality of rolls to change the traveling direction of the fiber bundle, and is passed through the flameproofing furnace in a plurality of stages.

[0005] The running carbon fiber precursor fiber bundle deteriorates the physical properties and quality of the carbon fiber due to winding around the roll or interference with the fiber bundle running next to the roll. In order to prevent interference between the fiber bundles, it is necessary to impart convergence to each fiber bundle. Therefore, various studies have been made to improve the convergence of each fiber bundle, especially in the production of carbon fibers.

[0006] As a method of imparting a bundle property to a fiber bundle,
For example, it is common to apply an oil agent treatment for applying an oil agent, or to perform a entanglement treatment in which single fibers constituting a fiber bundle are entangled in the same fiber bundle, and any of these treatments or a combination of these treatments is applied to the fiber bundle. Provides convergence.

[0007] Further, for example, in the method for producing oxidized fiber disclosed in Japanese Patent Application Laid-Open No. 58-214530, the above-described method is used in a case where a fiber bundle is impregnated with a silicon compound prior to the conventional oxidization treatment. An object of the present invention is to prevent a failure due to static electricity caused by a silicon-based compound and a generation of fluff or breakage of single yarn during a flame-proof treatment due to lack of convergence. In the manufacturing method of the publication, before the fiber bundle is introduced into the flameproofing furnace, the fiber bundle is subjected to the entanglement treatment by the fluid jetting method without impregnating the fiber bundle with the silicon-based compound, and then 10 times / m or less.

Further, in the method of producing carbon fibers disclosed in Japanese Patent Application Laid-Open No. 59-36727, when the oil is bundled by applying a conventional oil, the oil is tarified at the time of the flameproofing treatment and the fluff is formed. Problems such as breakage of single yarn and single yarn breakage, and problems such as damage due to static electricity caused by silicon-based compounds similar to the above-mentioned publication and generation of fluff and breakage of single yarn during flame-resistant treatment due to lack of convergence Trying to solve. Therefore, in the method disclosed in the same publication, before introducing the fiber bundle to a flameproofing furnace, a specific raw yarn oil agent is applied to the fiber bundle and dried, and then a ring-shaped air nozzle having 3 to 10 blowing holes is provided. The fiber is opened and entangled by an air jet method.

[0009] The fiber bundle having a high bunching property obtained by such a treatment is not wound around a roll in a carbon fiber manufacturing process such as a flame-proofing treatment, or the fiber bundle does not interfere with each other, so that the process passage property is improved.

[0010] By the way, before or during the carbon fiber production step, a confound is imparted in order to ensure the stability of the production step, and then the carbon fiber bundle produced through the carbon fiber production step is There are cases where the fibers are used in a state of being entangled, and cases where fiber opening such as weaving is required.

For example, when the carbon fiber bundle is used in a state of being entangled, if the entanglement imparted before or during the carbon fiber manufacturing process is not uniform, the physical properties and quality of the carbon fiber bundle are also uneven. And is not preferred. On the other hand, in the case where the confounding is used after being opened, the confounding is performed by using a spreading roll or the like. Furthermore, when the confounding is strong, or when there is an excessive confounding locally, a strong ironing operation is required for opening the fiber, which causes a problem that the physical properties are deteriorated and the quality is deteriorated due to generation of fluff. At the same time.

[0012]

Here, in any of the carbon fiber manufacturing methods disclosed in the above-mentioned publications, confounding is applied by a fluid injection method.
In Japanese Patent Application Laid-Open No. 8-214530, there is no specific description about a confounding device used for confounding by a fluid ejection method. Also, in JP-A-59-36727,
It is disclosed that a ring-shaped air nozzle having 3 to 10 blowing holes is used, which is a device used for imparting confounding to a general fiber bundle. That is, a commonly used entanglement imparting device introduces a traveling fiber bundle into a fluid ejection region where a fluid is ejected at a high pressure, and entangles it by turbulence. In such a general fiber bundle, strict uniformity of entanglement is not required unlike the above-described carbon fiber.

[0013] Therefore, no particular configuration of the confounding device is disclosed, and in any of the above-mentioned publications in which the uniformity of confounding is not considered at all, the confounding device provided with the confounding device is not disclosed. Does not have the strict uniformity required for carbon fibers and is considered to be non-uniform confounding.

[0014] Further, there is no description about the use of carbon fibers, and particularly about the opening of carbon fibers, and the above-mentioned publication improves the convergence of fiber bundles to improve the processability in the carbon fiber production process. The emphasis is only on planning. Therefore, although the convergence is high and the process stability is excellent,
On the other hand, it is difficult to open, and when opening is necessary, forced force such as ironing must be applied, and the physical properties and quality will deteriorate during the carbon fiber manufacturing process or during higher processing afterwards. There is a fear of coming. Incidentally, the single fiber fineness of the fiber bundle disclosed in the above publication is 0.5 to 2.0 denier (0.056 to 0.22 tex).

According to the present invention, the single fiber fineness is 0.04 to 0.4.
Tex's carbon fiber precursor fiber bundle also imparts appropriate bunching properties to the fiber bundle and imparts uniform entanglement in the longitudinal and radial directions of the fiber bundle, thereby improving the operation stability in the carbon fiber production process. In the case where the fiber opening can be improved and the fiber opening is required later, the entanglement imparting device for the carbon fiber precursor fiber bundle to which the entanglement that is easy to open uniformly is applied without performing the excessive forced opening operation. It is intended to provide.

[0016]

In order to achieve the above-mentioned object, the invention according to the first aspect of the present invention is to provide a entanglement for imparting entanglement by injecting a fluid to a continuously running carbon fiber precursor fiber bundle. An apparatus, comprising: a fluid ejection chamber for ejecting the fluid; and a seal chamber for sealing the fluid ejection chamber.

The fiber bundle is continuously passed through the carbon fiber precursor fiber bundle entanglement imparting device. A fluid is ejected from the fiber bundle traveling in the device in the fluid ejection chamber, and the fluid bundle gives the fiber bundle an entanglement.

The confounding device of the present invention has a seal chamber for sealing the fluid ejection chamber. That is, since the seal chamber is interposed between the fluid ejection chamber in which the fluid is ejected and in a high pressure state and the outside of the apparatus at atmospheric pressure, the pressure in the fluid ejection chamber can be maintained uniform and the ejection fluid can be maintained. By controlling the injection amount, the internal pressure of the fluid ejection chamber can be easily and accurately controlled. Therefore, uniform entanglement can be imparted to the fiber bundle in the longitudinal direction and the radial direction. Further, since the internal pressure of the fluid ejection chamber can be stabilized in the device of the present invention, the degree of confounding can be easily and accurately adjusted by the supply amount of the fluid, and the fluid on the fluid supply side of the confounding device of the present invention can be adjusted. Can be monitored by pressure. The seal chamber is preferably provided at both the entrance and exit of the fluid ejection chamber, but may be provided only at one of the entrance and exit in consideration of the installation space of the apparatus.

The fiber bundles imparted with uniform entanglement in the longitudinal direction and the radial direction as described above can secure carbon fiber excellent in physical properties and quality of the carbon fiber bundles while ensuring the stability of the carbon fiber bundle in the process of producing carbon fiber. Can be provided. Moreover, by ensuring the process passage stability, the process monitoring point can be omitted, and the productivity in the carbon fiber manufacturing process and the high-order processing process can be significantly improved.

Further, as described above, uniform entanglement can be imparted in the longitudinal direction and the radial direction of the fiber bundle, and the fiber bundle is unnecessarily highly entangled or locally excessively entangled. Therefore, even if the manufactured carbon fiber is opened later, it is easy to open the fiber, preventing damage to the fiber at the time of opening, maintaining the quality and reducing the load on the equipment for opening. it can.

Further, in the invention according to the second aspect of the present invention, in the fluid ejection chamber, a plurality of fluid ejection surfaces crossing the travel path of the fiber bundle are arranged at required intervals along the travel path, Each fluid ejection surface has a plurality of fluid ejection holes that open to the travel path, and is formed so that the central axis of each fluid ejection hole intersects the center line of the travel path. It is characterized in that the jet angle of the fluid from the hole has a direction vector that is a parallel flow of 60 ° or more and 90 ° or less with respect to the running direction of the fiber bundle. Here, the fluid ejection surface is not limited to a flat surface, and includes, for example, a conical surface having a point on the center line of the traveling path as an apex, and a wavy surface.

In the entanglement imparting device, since the fluid ejection chamber has a plurality of fluid ejection surfaces along the running path of the fiber bundle, the fluid ejection chamber gradually passes through the fluid ejection chamber in a plurality of stages. Is confounded. The fiber bundle thus gradually entangled by the plurality of fluid ejecting surfaces has an appropriate convergence property and further enhances the uniformity of the entanglement in the longitudinal direction and the radial direction. Therefore, the process passage stability in the carbon fiber manufacturing process is further improved, and when the manufactured carbon fiber is later opened, the opening becomes easier, and damage to the fiber during opening is prevented. Quality can be improved.

In the present invention, in particular, a plurality of fluid injection holes which are open to the traveling path of the carbon fiber precursor fiber bundle are provided in the fluid injection chamber of the entanglement processing apparatus, with each central axis of the fluid injection hole being aligned with the traveling path. Since a plurality of fluid ejection surfaces formed so as to intersect at one point on the center line are arranged along the traveling direction of the fiber bundle, the fiber bundle passing through the fluid ejection chamber is
The degree of entanglement is gradually and uniformly increased, and uniform entanglement without unevenness in the longitudinal and radial directions of the fiber bundle is provided.
In addition, the ejection amount of the fluid on the plurality of fluid ejection surfaces may be the same, or may be different from each other.

Further, a plurality of fluid ejection holes are formed in the fluid ejection surface, each of which is open to the traveling path of the fiber bundle, and a plurality of fluid ejection holes are also opened in the radial direction of the fiber bundle. Therefore, in particular, the unevenness of the entanglement in the radial cross section of the fiber bundle can be minimized. In order to reduce the radial confounding unevenness, it is preferable to arrange the fluid injection holes at 4 or more at a uniform angle in the radial direction, and more preferably, to arrange 6 to 9 fluid injection holes at an equal angle. It is preferable to arrange them.

Further, the ejection angle of the fluid from the fluid ejection hole is 60 ° or more with respect to the traveling direction (0 °) of the fiber bundle.
Since it has a direction vector that is 90 ° (orthogonal) or less, it is possible to impart appropriate confounding without generating fluff or the like.

When the fluid ejection angle is less than 60 °,
Because the effect of the turbulence of the fiber bundle by the fluid is reduced,
The fiber bundle is insufficiently entangled, and impairs the processability in the carbon fiber manufacturing process. On the other hand, if the fluid ejection angle exceeds 90 °, the flow direction of the fluid becomes countercurrent to the traveling direction of the fiber bundle, and the single fibers constituting the fiber bundle are excessively disturbed. As a result, mechanical properties are impaired, and fluff is likely to occur. Furthermore, the bundle property of the fiber bundle also tends to deteriorate.

The fluid ejection angles from the fluid ejection holes may all be the same, or may be different for each of the fluid ejection surfaces, and may also be different within the same fluid ejection surface. . However, when the fluid ejection angles from the respective fluid ejection holes in the same fluid ejection surface are made different, it is preferable that the opposing fluid ejection holes that are displaced by 180 ° have the same fluid ejection angle.

It is desirable that the seal structure in the seal chamber is not in contact with the fiber bundle, and it is necessary to be able to seal efficiently and maintain the internal pressure of the fluid ejection chamber. From this point of view, the invention according to claim 3 is characterized in that the seal chamber has a labyrinth seal structure. By adopting the labyrinth seal structure in the seal chamber in this manner, the internal pressure gradually decreases from the fluid ejection chamber to the outside of the apparatus due to the vortex in a plurality of stages in the seal chamber. Therefore, when the seal chamber is provided on the outlet side of the fluid ejection chamber, while the fiber bundle entangled in the fluid ejection chamber passes through the seal chamber,
The vortices make the confounding more uniform and stable. In addition, since the pressure is sufficiently reduced at the entrance and exit of the fiber bundle to the device, the fluid does not erupt with a strong force, and the running of the fiber bundle is not disturbed or the fiber is not damaged. .

Further, the invention according to claim 4 of the present invention is characterized in that an ejector is disposed at an outlet of the carbon fiber precursor fiber bundle. By arranging an ejector at the outlet of the fiber bundle of the entanglement device, the inside of the entanglement device is depressurized by activating the ejector at the time of threading the fiber bundle, and the fiber bundle is easily passed through the entanglement device. It becomes possible to thread.

[0030] The invention according to claim 5 is characterized in that the fluid is a gas. It should be noted that air is preferably used as the gas. Further, the temperature of the fluid is not particularly limited, but is generally room temperature.

As described above, by using the entanglement imparting device of the present invention, a uniform entanglement can be imparted to the fiber bundle, the degree of the entanglement can be easily and accurately controlled, the bunching property is excellent, and the fiber opening property is excellent. An excellent carbon fiber precursor fiber bundle can be obtained. Therefore, even in the case of a fiber bundle composed of extremely fine fibers having a single fiber fineness of not less than 0.04 tex and not more than 0.4 tex, it is possible to impart entanglement with appropriate bunching properties and openability, and to produce carbon fibers. Since breakage of single yarns and fluff in the process can be prevented, and the obtained carbon fiber bundle can be easily opened without applying an excessive load, a carbon fiber bundle excellent in physical properties and quality can be manufactured.

In the present invention, in particular, the single fiber fineness is 0.1.
04 tex or more, 0.4 tex or less, particularly suitable when imparting entanglement to a carbon fiber precursor fiber bundle composed of a multifilament fiber bundle in which the number of the single fibers constituting the fiber is 800 or more and 100,000 or less. Used for Examples of the carbon fiber precursor fiber bundle include an acrylic fiber bundle, a polyvinyl alcohol-based fiber bundle, and a pitch-based fiber bundle. Particularly, it is suitable for imparting entanglement of an acrylic fiber bundle, and the acrylic fiber bundle preferably contains at least 90% by mole of acrylonitrile.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an apparatus for imparting entanglement to a carbon fiber precursor fiber bundle according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an apparatus for imparting entanglement to a carbon fiber precursor fiber bundle according to the present invention. FIG. 2 is a view taken along line AA of FIG. 1, and FIG. It is sectional drawing which followed the B line.

In the entanglement imparting device 1, the running path 2 of the fiber bundle F penetrates through the center in the longitudinal direction, and the fiber bundle F runs continuously in the running path 2. A fluid ejection chamber 3 is arranged at the center in the longitudinal direction of the device 1, and seal chambers 4 and 5 are arranged before and after the fluid ejection chamber 3, respectively. Furthermore,
An ejector 6 is arranged at an outlet of the rear seal chamber 5.

The fluid ejection chamber 3 has an inner wall 3a having a circular cross section perpendicular to the running direction of the fiber bundle F, and the inside of the inner wall 3a constitutes the running path 2 of the fiber bundle F. I have. Further, a fluid storage chamber 3b is provided around the entire outer periphery of the inner wall portion 3a.
Is formed, and fluid is supplied to the fluid storage chamber 3b from a fluid supply port 3c.

In the fluid ejection chamber 3, fluid ejection surfaces 3d, 3d orthogonal to the traveling direction are provided at two places along the traveling direction.
Are formed. As shown in FIG. 3, the fluid jetting surface 3d has a distance of 60 from each other along the radial direction of the inner wall surface 3a.
Six fluid injection holes 3e are formed by being displaced by degrees. The fluid injection hole 3e is formed to open in the travel path 2 of the fiber bundle F and penetrate the fluid storage chamber 3b. The six fluid ejection holes 3e formed on the single fluid ejection surface 3d have their central axes intersecting at one point on the center line of the traveling path 2.

Further, the center axis of the fluid injection hole 3e is formed so as to be 90 ° (perpendicular) to the center line of the traveling path 2, and the fluid supplied to the fluid storage chamber 3b is the same. Injection is performed from the injection hole 3e toward the fiber bundle F traveling on the traveling path 2 with a perpendicular direction vector. In this embodiment, all the fluid ejection holes 3e have the same diameter, and the fluid storage chamber 3b is provided so that the fluid can be ejected from the plurality of fluid ejection holes 3e at a uniform ejection pressure and ejection amount. Can be. It should be noted that a fluid supply pipe may be individually connected to each of the fluid ejection holes 3e to eject fluid at a desired pressure and flow rate.

In the sealing chambers 4, 5, the housings 4a,
5a, a cylindrical labyrinth seal structure 4b, 5
b is inserted and fixed at a predetermined position by a set bolt or the like. Labyrinth seal structure 4b, 5
A traveling path 2 having a circular cross section orthogonal to the traveling direction of the fiber bundle F is formed inside b. The cross-sectional shape of the traveling path 2 is not limited to a circle, but may be an ellipse or a polygon.

As described above, in the present embodiment, the fluid ejection chamber 3
Since the seal chambers 4 and 5 are disposed on both the front and rear sides, the fluid ejection chamber 3 can be effectively sealed. That is, the seal chambers 4 and 5 are interposed between the fluid ejection chamber 3 in which the fluid is ejected and in a high pressure state and the outside of the apparatus under the atmospheric pressure.
The pressure in the fluid ejection chamber 3 is kept uniform. Therefore, the fiber bundle F can be uniformly entangled in the longitudinal direction and the radial direction. Further, the internal pressure of the fluid ejection chamber 3 can be easily and accurately controlled by the seal chambers 4 and 5, and the degree of confounding can be controlled by controlling the ejection pressure and the ejection amount of the fluid as necessary. Can be adjusted freely.

Further, in the present embodiment, particularly, since the seal chambers 4 and 5 having the labyrinth seal structure are employed, the pressure in the seal chambers 4 and 5 is increased by the vortex formed in multiple stages. The temperature gradually decreases from the chamber 3 toward the outside of the apparatus. Therefore, the confounding imparted in the fluid ejection chamber 3 is further uniformed and stabilized in the seal chamber 5 on the outlet side (rear side) of the fluid ejection chamber 3.

The seal chambers 4 and 5 prevent a sudden change in pressure in the vicinity of the entrance and exit of the fiber bundle in the fluid injection chamber 3, and the fluid has a strong momentum at the entrance and exit of the fiber bundle to the entanglement device 1. To prevent spouting. Therefore, the fiber bundle F can run stably, there is no yarn sway, and no damage occurs due to contact with the entrance and exit of the apparatus 1 and the peripheral wall of the traveling path 2.

It is most preferable to provide the seal chambers 4 and 5 at both the entrance and exit of the fluid ejection chamber 3 as in the present embodiment. The seal chamber may be provided only in one of the three entrances.

When the entanglement is imparted to the carbon fiber precursor fiber bundle by using the entanglement imparting device 1, first, the fiber bundle is inserted into the traveling path 2 of the entanglement imparting device 1 by using the ejector 6. Let it. The ejector 6 has a fluid inlet 6
When the fiber bundle is brought close to the entrance side of the traveling path 2 of the entanglement device 1 in a state where the fluid is supplied from a and the inside of the entanglement device 1 is reduced in pressure, the fiber bundle F is inserted into the entanglement device 1. This makes threading easier.

After the fiber bundle F is passed through the confounding device 1 in this way, the fiber bundle F is run and the device 1 is driven to confound the fiber bundle F. The fiber bundle F inserted into the entanglement device 1 is under tension, and the tension is not particularly limited as long as it does not contact the peripheral wall surface of the traveling path 2 of the entanglement device 1.

The fiber bundle F is introduced into the fluid jet chamber 3 through the front seal chamber 4. First, in the fluid ejection chamber 3,
At the front fluid ejection surface 3d, fluid is ejected from the six fluid ejection holes 3e toward the entire circumference of the fiber bundle F at a direction vector of 90 ° at a uniform pressure and a uniform flow rate, and confounding is applied. In the same manner, confounding is also applied to the fluid ejection surface 3d. That is, in the entanglement imparting device 1, the fluid is ejected from the fiber bundle F from two cross sections perpendicular to the running direction, and the fluid is ejected from the fiber bundle F by a total of 16 fluid ejection holes 3e. Sprayed.

As described above, since the entanglement is sequentially applied by the two fluid ejection surfaces 3d, 3d, compared to the conventional entanglement imparting apparatus in which the fluid is ejected at a single location and entangled, the fiber bundle is formed. More uniform confounding can be provided in the longitudinal direction and the radial direction. Therefore, also in the subsequent carbon fiber manufacturing process, winding around a roll or contact with an adjacent fiber bundle is reliably prevented, and the process passage stability is improved, and the quality of the carbon fiber can be secured.

Further, since the confounding is uniform in the longitudinal direction and the radial direction, there is no locally excessive confounding portion, and the confounding is applied in two stages, so that the degree of confounding can be controlled with high precision. Even when fiber opening is required later, the fiber bundle can be easily opened without applying an excessive load,
The carbon fibers are not degraded by the opening.

As the fluid used for the confounding, it is preferable to adopt room temperature air from the viewpoints of cost and handleability, and the amount of supplied air depends on the amount of air introduced on the fluid supply side of the confounding device 1. The pressure is appropriately adjusted depending on the pressure, that is, the supply amount to the fluid storage chamber 3b.

The confounding device 1 'shown in FIG. 4 is a modification of the confounding device 1 described above, and the same components are denoted by the same reference numerals, and detailed description thereof will be omitted. The entanglement imparting device 1 ′ which is a modification example has a fluid injection hole 3 in the fluid injection chamber 3.
Only e 'differs from the device 1 described above.

The fluid ejection chamber 3 of the confounding device 1 'is also provided with two fluid ejection surfaces 3d, 3d.
Are formed with six fluid injection holes 3e '. The six fluid injection holes 3e 'are displaced by 60 ° from each other along the radial direction of the inner wall surface 3a, and are formed so as to open to the traveling path 2 of the fiber bundle F and penetrate the fluid storage chamber 3b. Have been. All the fluid injection holes 3e 'have the same diameter, and the central axes of the six fluid injection holes 3e' all intersect at one point on the center line of the running path 2 of the fiber bundle F. Further, the traveling path 2 is located at the center axis of the fluid injection hole 3e '.
Is formed such that the angle D with respect to the center line of the fluid storage chamber 3b is about 60 °, and the fluid supplied to the fluid storage chamber 3b is directed to the fiber bundle F traveling on the travel path 2 from the injection hole 3e ′ by about 60 °. It is injected with a direction vector that is a co-current of °.

In the confounding device 1 described above, the two fluid ejection surfaces 3d are arranged at an interval in the fluid ejection chamber 3, but the fluid ejection surfaces are not limited to two surfaces. The above can also be provided. In the present invention, at least two fluid ejection surfaces are required, and preferably 2 to 5 surfaces in order to impart uniform entanglement in the radial and longitudinal directions of the fiber bundle. Further, the interval between the plurality of fluid ejection surfaces is not particularly limited, but is preferably 4 mm or more from the viewpoint of device production.
It is preferably 0 mm or less.

In the entanglement devices 1 and 1 'shown in FIGS. 1 and 4 described above, all six fluid ejection holes 3e and 3e' formed in one fluid ejection surface 3d are aligned with the central axis thereof. Although the intersection angle with the center line of the traveling path 2 is the same, that is, the fluid ejection angle (ejection direction vector) is the same, the fluid ejection angle of the plurality of fluid ejection holes 3e and 3e 'of one fluid ejection surface 3d is It can be changed and varied within the range of the present invention (60 ° or more and 90 ° or less). However, in that case,
Each injection hole intersects at a point on the center line of the traveling path 2, and 18
It is preferable that the fluid ejection holes that are displaced by 0 ° and face each other have the same fluid ejection angle.

When the fluid ejection angle is 60 ° or more and less than 90 °, the traveling direction of the fiber bundle F and the traveling direction of the fluid are substantially the same as shown in FIG. Further, the number of the fluid ejection holes is not limited to six, and it is sufficient that two or more fluid ejection holes are formed. In addition, when the fluid ejection angles of the fluid ejection holes are all the same, it is preferable that the plurality of fluid ejection holes are arranged so as to open on the same circumference, and the intervals between the openings are uniform.

The entanglement device of the present invention is often installed immediately before winding of a carbon fiber precursor fiber bundle such as an acrylic fiber bundle, or may be installed during the carbon fiber manufacturing process as necessary. It is also possible to place them in places.

Hereinafter, the present invention will be described with reference to specific examples and comparative examples. In the examples and the comparative examples, the fiber bundle is subjected to the entanglement treatment using the entanglement imparting device described later. For each of the treated fiber bundles, the operation stability in the carbon fiber production process and the uniformity of the entanglement were evaluated. The results are shown in Table 1. In addition, the uniformity of confounding is a CV value indicating a variation in the degree of confounding of the fiber bundle measured according to JIS-L1013. The evaluation of x in the uniformity of confounding indicates that the degree of confounding is extremely low compared to the others.

In the following Examples and Comparative Examples, Fiber bundle: acrylonitrile 96 mol% Single fiber tex: 0.11 tex Number of single fibers constituting fiber bundle: 12,000 Fluid: Pressure on the fluid introduction side of the entanglement imparting device Room-temperature air of 250 kPa The tension of the fiber bundle: 0.5 g / tex The passing speed of the fiber bundle: 10 m / min, and these conditions are all the same.

Embodiment 1 In the entanglement processing apparatus 1 shown in FIG. 1, three fluid ejection surfaces 3d are arranged at equal intervals in the fluid ejection chamber 3 along the running direction of the fiber bundle. In 3d, the entanglement processing is performed on the fiber bundle by using an entanglement imparting device in which six fluid ejection holes having a fluid ejection angle of 90 ° (a total of 18 on three surfaces) are displaced by 60 ° and arranged at equal intervals. Was given. The obtained fiber bundle has a good bunching property, is not wrapped around a roll or interferes with an adjacent fiber bundle at all in the carbon fiber production process, and is extremely excellent in operation stability. The CV value of the confounding uniformity is 7%, which is extremely high. There was no excessively entangled portion, and the fiber was excellent in opening property.

Comparative Example 1 An apparatus similar to that of Example 1 was used except that only one fluid ejection surface was used (a total of six fluid ejection holes) in the entanglement imparting device used in Example 1. A confounding treatment was applied. The obtained fiber bundle is provided with a bundle property, and the operation stability in the carbon fiber production process can be secured. However, the uniformity of the entanglement has a CV value of 13%.
And high and non-uniform. In addition, the spreadability was low.

[Comparative Example 2] The entanglement treatment was performed using the same apparatus as in Example 1 except that the fluid injection angle from the fluid injection hole was 30 ° in the entanglement imparting apparatus used in Example 1. . The obtained fiber bundle has a low bunching property, and is wound around a roll or interferes with an adjacent fiber bundle in the carbon fiber production process, resulting in low operation stability. In addition, the degree of confounding was uneven, and the spreadability was poor.

Comparative Example 3 Example 1 was repeated except that the number of fluids formed on each fluid ejection surface was one (three in total on the three surfaces) in the entanglement imparting device used in Example 1. The confounding treatment was performed using the same apparatus as that described above. The obtained fiber bundle is provided with a bundle property, and the operation stability in the carbon fiber production process can be secured. However, the uniformity of the entanglement is as high as 14% and the CV value is non-uniform. . Also, the spreadability was poor.

[Comparative Example 4] In the entanglement imparting device 1 of FIG. 1, the fluid seal chambers 4 and 5 are not provided, and the fluid ejection chamber 3 has only one fluid ejection surface 3d. The fiber bundle was subjected to entanglement treatment using a entanglement imparting device in which only one fluid 3e having a fluid ejection angle of 90 ° was formed in 3d. The obtained fiber bundle is provided with a bundle property, and the operation stability in the carbon fiber manufacturing process can be secured. However, the CV value is 14 with respect to the uniformity of the entanglement.
% And is non-uniform.

[0062]

[Table 1]

As described above, according to the apparatus for imparting entanglement to a carbon fiber precursor fiber bundle of the present invention, it is possible to impart uniform entanglement in the longitudinal direction and the radial direction with good convergence to the fiber bundle. . By using such an entanglement imparting device, it is possible to maintain high operation stability in the carbon fiber production process, and at the same time, in high quality, high quality carbon fiber bundles, and in higher order processes such as openability. It is possible to obtain carbon fibers excellent in handleability.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a confounding device according to a preferred embodiment of the present invention.

FIG. 2 is a view as viewed from an arrow AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a schematic diagram of a confounding device according to a modification of the confounding device in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Entangling device 2 Travel path of fiber bundle 3 Fluid ejection chamber 3a Inner wall 3b Fluid storage chamber 3c Fluid supply port 3d Fluid ejection face 3e Fluid ejection hole 4 Seal chamber 4a Housing 4b Labyrinth seal structure 5 Seal chamber 5a Housing 5b Labyrinth Seal structure 6 Ejector 6a Fluid inlet F Carbon fiber precursor fiber bundle D Fluid injection angle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiro Makishima 20-1 Miyukicho, Otake City, Hiroshima Prefecture Inside Mitsubishi Rayon Co., Ltd. Otake Works (72) Inventor Masahiro Shibahashi 201-1 Miyukicho, Otake City, Hiroshima Prefecture Mitsubishi Rayon Co., Ltd. Otake Works F-term (reference) 4L036 AA01 4L037 CS03 CT27 PA53 PF23 PF57 PS20

Claims (5)

[Claims] 1. A entanglement imparting apparatus for imparting entanglement by ejecting a fluid to a continuously running carbon fiber precursor fiber bundle, wherein the fluid ejection chamber for ejecting the fluid and the fluid ejection chamber are sealed. And a sealing chamber for entanglement with the carbon fiber precursor fiber bundle. 2. The fluid ejection chamber, wherein a plurality of fluid ejection surfaces crossing the travel path of the fiber bundle are arranged at predetermined intervals along the travel path, and each fluid ejection surface is open to the travel path. It has a plurality of fluid injection holes, and is formed so that the central axis of each fluid injection hole intersects on the center line of the traveling path, and the injection angle of the fluid from the fluid injection hole is 2. The device for imparting entanglement to a carbon fiber precursor fiber bundle according to claim 1, wherein the device has a direction vector which is a co-current of 60 ° or more and 90 ° or less with respect to a running direction. 3. The apparatus according to claim 1, wherein the seal chamber has a labyrinth seal structure. 4. The apparatus for imparting entanglement to a precursor fiber bundle for carbon fibers according to claim 1, wherein an ejector is disposed at an outlet of the precursor fiber bundle for carbon fibers. 5. The apparatus for imparting entanglement to a precursor fiber bundle for carbon fibers according to claim 1, wherein the fluid is a gas.