JP4408323B2 - Entangling device for carbon fiber precursor fiber bundle - Google Patents

Description

【００６３】
このように、本発明の炭素繊維前駆体繊維束への交絡付与装置によれば、繊維束に対して集束性が良く、長手方向及び径方向に均一な交絡を付与することができる。かかる交絡付与装置を用いることで、炭素繊維製造工程においては高い操業安定性を維持することが可能になると同時に、高品質、高品位な炭素繊維束、更には開繊性などの高次工程での取扱性にも優れた炭素繊維を得ることが可能となる。
【図面の簡単な説明】
【図１】本発明の好適な実施形態による交絡付与装置の概略図である。
【図２】図１におけるＡ−Ａ線から見た矢視図である。
【図３】図１におけるＢ−Ｂ線に沿った断面図である。
【図４】図１における交絡付与装置の変形例による交絡付与装置の概略図である。
【符号の説明】
１ 交絡付与装置
２ 繊維束の走行路
３ 流体噴射室
３ａ 内壁部
３ｂ 流体貯留室
３ｃ 流体供給口
３ｄ 流体噴射面
３ｅ 流体噴射孔
４ シール室
４ａ ハウジング
４ｂ ラビリンスシール構造体
５ シール室
５ａ ハウジング
５ｂ ラビリンスシール構造体
６ エゼクター
６ａ 流体導入口
Ｆ 炭素繊維前駆体繊維束
Ｄ 流体噴射角[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an entanglement imparting device for converging carbon fiber precursor fiber bundles, and in particular, uniform entanglement is imparted in the longitudinal direction and the radial direction of the fiber bundle, so that the fiber bundle not only has excellent converging properties. The present invention relates to a device for imparting entanglement to a carbon fiber precursor fiber bundle that is excellent in fiber opening property and ensures operational stability in a subsequent carbon fiber production process.
[0002]
[Prior art]
Carbon fiber has excellent specific strength and specific modulus compared to other fibers, and has many excellent characteristics such as excellent specific resistance and high chemical resistance compared to metal, Utilizing its excellent characteristics, it is widely used for reinforcing fibers for composite materials with resins, other industrial applications, and in the sports and aerospace fields.
[0003]
In general, carbon fibers are obtained by making a raw material fiber such as acrylonitrile fiber flame resistant in an oxidizing atmosphere of 200 ° C. or higher and then carbonizing it in an inert atmosphere of 300 ° C. or higher.
[0004]
In the flameproofing 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 in a sheet shape with a predetermined interval inside the flameproofing furnace. While traveling, the traveling fiber bundle is wound around a plurality of rolls to change the traveling direction of the fiber bundle and pass through the flameproofing furnace in a plurality of stages.
[0005]
This traveling carbon fiber precursor fiber bundle is deteriorated in the physical properties and quality of the carbon fiber due to winding around the roll or interference with the fiber bundle traveling next to the roll. In order to prevent this interference, it is necessary to impart convergence to each fiber bundle. Therefore, especially in the production of carbon fibers, various studies have been made so far to improve the convergence of each fiber bundle.
[0006]
As a method for imparting convergence to a fiber bundle, for example, an oil agent treatment for imparting an oil agent or an entanglement treatment in which single fibers constituting the fiber bundle are entangled in the fiber bundle are generally performed. The fiber bundle is given convergence by any of these methods or a combination of these treatments.
[0007]
Further, for example, in the method for producing flameproof fibers disclosed in Japanese Patent Application Laid-Open No. 58-214530, the silicon compound in the case where the fiber bundle is impregnated with a silicon compound prior to the conventional flameproofing treatment. The purpose is to prevent the occurrence of fluff and single yarn breakage during the flameproofing treatment due to static electricity caused by the lack of convergence. And in the manufacturing method of the publication, before introducing the fiber bundle into the flameproofing furnace, the fiber bundle is subjected to the entanglement treatment by the fluid injection method without impregnating the fiber bundle with the silicon compound, and further 10 times / A low false twist treatment of m or less is performed.
[0008]
Furthermore, in the method for producing carbon fiber disclosed in Japanese Patent Application Laid-Open No. 59-36727, when the oil is concentrated by applying a conventional oil agent, the oil agent is tarred during the flameproofing treatment, and fluff and single yarn Let's solve the problem of cutting, the trouble caused by static electricity caused by the same silicon compound as the previous publication, and the problem of fluff and single yarn breakage during flameproofing treatment due to lack of convergence It is said. Therefore, in the method disclosed in the publication, a ring-like air nozzle having 3 to 10 blow holes is provided after a specific yarn oil agent is applied to the fiber bundle and dried before introduction into the flameproofing furnace. Using the air-spreading method, the fiber is spread and entangled.
[0009]
The highly bundled fiber bundle obtained by such a treatment is improved in process passability without being wound around a roll or interfering with each other in a carbon fiber production process such as a flameproofing treatment.
[0010]
By the way, before the carbon fiber manufacturing process or in the middle of the manufacturing process, confounding is given to ensure the stability of the manufacturing process passing, and then the carbon fiber bundle manufactured through the carbon fiber manufacturing process is given the confounding. There are cases where it is used in a state where it is applied and cases where opening is required during weaving.
[0011]
For example, when used in a state where entanglement is applied, if the entanglement applied before or during the carbon fiber manufacturing process is non-uniform, the physical properties and quality of the carbon fiber bundle will also be non-uniform. Is not preferable. On the other hand, when the entanglement is opened and used, the entanglement is opened by a spread roll or the like, but if the entanglement is not uniform, the degree of opening is also not uniform. Furthermore, when the entanglement is strong, or when there is excessive entanglement locally, a strong ironing operation is necessary for the opening, which causes a problem of deterioration of physical properties and quality due to occurrence of fluff and the like. Is included at the same time.
[0012]
[Problems to be solved by the invention]
Here, in any of the carbon fiber manufacturing methods disclosed in the above-mentioned publications, entanglement is imparted by the fluid ejection method, but in Japanese Patent Application Laid-Open No. 58-214530, entanglement is imparted by the fluid ejection method. There is no specific description of the confounding imparting device used in the above. Japanese Laid-Open Patent Publication No. 59-36727 discloses the use of a ring-shaped air nozzle having 3 to 10 blowout holes, which is used for imparting entanglement to a general fiber bundle. Device. That is, the confounding imparting device that is generally used introduces a traveling fiber bundle into a fluid ejecting area where a fluid is ejected at a high pressure, and confounds it by turbulent flow. Such a general fiber bundle does not require strict entanglement uniformity unlike the carbon fiber described above.
[0013]
Therefore, it is not disclosed that the entanglement imparting device has any special configuration, and in any of the above-mentioned publications in which no consideration is given to the uniformity of entanglement, the entanglement imparted is a carbon fiber. It does not have the exacting degree of uniformity required as a non-conformal entanglement.
[0014]
In addition, there is no description about the use of carbon fiber, especially the opening of carbon fiber, and the above publication aims to improve the processability in the carbon fiber manufacturing process by improving the convergence of the fiber bundle. Only with emphasis. Therefore, it has high convergence and excellent process stability, but on the other hand, it is difficult to open, and when opening is necessary, forced force such as ironing must be applied. There is a risk that physical properties and quality may be deteriorated during the fiber manufacturing process or in the subsequent high-order processing. 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).
[0015]
In the present invention, even if it is a carbon fiber precursor fiber bundle having a single fiber fineness of 0.04 to 0.4 tex, the fiber bundle is appropriately focused and uniform in the longitudinal direction and the radial direction of the fiber bundle. Entanglement, can improve the operational stability in the carbon fiber manufacturing process, and if it is necessary to open the fiber later, it is easy to open the fiber uniformly without excessive forced opening operation. It aims at providing the confounding provision apparatus to the carbon fiber precursor fiber bundle to which is provided.
[0016]
[Means for Solving the Problems]
In order to achieve the above-described object, the invention according to claim 1 is an entanglement imparting device that imparts entanglement by injecting a fluid onto a continuously running carbon fiber precursor fiber bundle, and injects the fluid. And a seal chamber disposed at least one of a carbon fiber precursor fiber bundle inlet and an outlet of the fluid jet chamber and sealing the fluid jet chamber.
[0017]
The fiber bundle is continuously passed through the carbon fiber precursor fiber bundle entanglement imparting device. The fiber bundle traveling in the apparatus is ejected with fluid in the fluid ejection chamber, and the fluid is entangled with the fiber bundle.
[0018]
The confounding imparting 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 atmospheric pressure device, the pressure in the fluid ejection chamber can be maintained uniformly, and the ejection fluid By controlling the ejection 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. Moreover, since the internal pressure of the fluid ejection chamber can be stabilized in the apparatus of the present invention, the degree of entanglement can be easily and accurately adjusted by the amount of fluid supplied, and the fluid on the fluid supply side of the entanglement imparting apparatus of the present invention Can be monitored by pressure. The seal chamber is preferably provided at both the entrance and exit of the fluid ejection chamber, but can be provided only at either the entrance or exit in consideration of the installation space of the apparatus.
[0019]
Thus, the fiber bundle to which the uniform entanglement was given in the longitudinal direction and the radial direction ensures process passage stability in the carbon fiber production process, and provides a carbon fiber excellent in the physical properties and quality of the carbon fiber bundle. Can do. Moreover, by ensuring the process passage stability, the productivity of the carbon fiber manufacturing process and the high-order processing process can be remarkably improved, for example, the process monitoring point can be omitted.
[0020]
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 not unnecessarily highly entangled or locally entangled excessively. Therefore, when the produced carbon fiber is opened later, the opening is easy, damage to the fiber at the time of opening can be prevented, the quality can be maintained, and the equipment burden for opening can be reduced.
[0021]
Further, in the invention according to claim 2, in the fluid ejection chamber, a plurality of fluid ejection surfaces crossing the traveling path of the fiber bundle are arranged at a predetermined interval along the traveling path, and each fluid ejection chamber The surface has a plurality of fluid ejection holes that open to the travel path, and is formed so that the center axis of each fluid ejection hole intersects the center line of the travel path. It is characterized by having a direction vector in which the fluid ejection angle is a parallel flow of 60 ° or more and 90 ° or less with respect to the traveling 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 travel path as a vertex, a wavy surface, and the like.
[0022]
In the entanglement imparting device, since the fluid ejection chamber has a plurality of fluid ejection surfaces along the traveling path of the fiber bundle, the entanglement is gradually entangled in a plurality of stages when passing through the fluid ejection chamber. Is granted. In this way, the fiber bundle gradually entangled by the plurality of fluid ejection surfaces has an appropriate convergence and further improves the uniformity of the entanglement in the longitudinal direction and the radial direction. As a result, the process-passing stability in the carbon fiber manufacturing process is further improved, and even when the manufactured carbon fiber is later opened, the opening is further facilitated, and damage to the fiber during opening is prevented. The quality can be improved.
[0023]
In the present invention, in particular, a plurality of fluid ejection holes that open to the traveling path of the carbon fiber precursor fiber bundle are provided in the fluid ejection chamber of the entanglement processing apparatus. Since a plurality of fluid ejection surfaces formed so as to intersect at one point are arranged along the traveling direction of the fiber bundle, the fiber bundle passing through the fluid ejection chamber is gradually and uniformly entangled. Is increased, and uniform entanglement without unevenness is imparted in the longitudinal direction and radial direction of the fiber bundle. Note that the amount of fluid ejected on the plurality of fluid ejecting surfaces may be the same or different from each other.
[0024]
Furthermore, each of the fluid ejection surfaces is formed with a plurality of fluid ejection holes that open to the travel path of the fiber bundle, and the plurality of fluid ejection holes are also opened in the radial direction of the fiber bundle. Unevenness of entanglement of the radial cross section of the fiber bundle can be minimized. In order to reduce the radial entanglement unevenness, it is preferable to arrange the fluid injection holes at 4 or more at an equal angle in the radial direction, and more preferably 6 to 9 fluid injection holes at an equal angle. It is preferable to arrange them.
[0025]
In addition, since the jet angle of the fluid from the fluid jet hole has a direction vector that is parallel flow of 60 ° or more and 90 ° (orthogonal) or less with respect to the traveling direction (0 °) of the fiber bundle, Appropriate confounding can be imparted without generating fuzz and the like.
[0026]
When the fluid ejection angle is less than 60 °, the effect of the disturbance of the fiber bundle due to the fluid is reduced, so that the fiber bundle is insufficiently entangled and impairs the processability in the carbon fiber manufacturing process. On the other hand, when the fluid ejection angle exceeds 90 °, the flow direction of the fluid becomes a counterflow opposite 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 convergence property of the fiber bundle tends to deteriorate.
[0027]
The fluid ejection angles from the fluid ejection holes may all be the same, or may be different for each fluid ejection surface, 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 displaced by 180 ° have the same fluid ejection angle.
[0028]
The seal structure in the seal chamber is desirably non-contact with the fiber bundle, and it is necessary to efficiently seal and to maintain the internal pressure of the fluid ejection chamber. From this viewpoint, the invention according to claim 3 of the present invention 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 toward the outside of the apparatus due to a plurality of vortex flows in the seal chamber. Therefore, when the seal chamber is provided on the outlet side of the fluid ejection chamber, the entanglement makes the entanglement more uniform and stable while the fiber bundles entangled in the fluid ejection chamber pass through the seal chamber. Turn into. In addition, since the pressure at the entrance and exit of the fiber bundle to the device is sufficiently reduced, the fluid will not be ejected with a strong force, and the running of the fiber bundle will not be disturbed or the fiber will not be damaged. .
[0029]
Further, the invention according to the present claim 4, the exit of the carbon fiber 維前 precursor fiber bundle is characterized in that an ejector is arranged. By arranging an ejector at the exit of the fiber bundle of the confounding imparting device, the inside of the confounding imparting device is depressurized by operating the ejector when the fiber bundle is threaded, and the fiber bundle is easily passed through the confounding imparting device. It becomes possible to thread.
[0030]
The invention according to claim 5 is characterized in that the fluid is a gas. In general, air is preferably used as the gas. Further, the temperature of the fluid is not particularly limited, but is generally room temperature.
[0031]
As described above, by using the entanglement imparting device of the present invention, carbon fiber that can impart uniform entanglement to the fiber bundle, can easily and accurately control the degree of entanglement, and has excellent convergence and spreadability. A fiber precursor fiber bundle can be obtained. Therefore, even a fiber bundle composed of extremely thin fibers with a single fiber fineness of 0.04 tex or more and 0.4 tex or less can be entangled with appropriate convergence and spreadability, and carbon fiber production Single fiber breakage and fluff can be prevented in the process, and the obtained carbon fiber bundle can be easily opened without applying an excessive load. Therefore, a carbon fiber bundle excellent in physical properties and quality can be produced.
[0032]
In the present invention, in particular, a carbon having a single filament fineness of 0.04 tex or more and 0.4 tex or less and a multifilament fiber bundle in which the number of the single fibers constituting is 800 or more and 100,000 or less. It is particularly preferably used when confounding the fiber precursor fiber bundle. Examples of the carbon fiber precursor fiber bundle include an acrylic fiber bundle, a polyvinyl alcohol fiber bundle, and a pitch fiber bundle. In particular, it is suitable for imparting entanglement of an acrylic fiber bundle, and the acrylic diameter fiber bundle preferably contains at least 90 mol% of acrylonitrile.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the entanglement imparting device for the carbon fiber precursor fiber bundle of the present invention will be described in detail with reference to the drawings by giving preferred embodiments.
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 an arrow view taken along line AA in FIG. 1, and FIG. It is sectional drawing along a B line.
[0034]
In the entanglement imparting device 1, the travel path 2 of the fiber bundle F passes through the center in the longitudinal direction, and the fiber bundle F travels continuously in the travel path 2. A fluid ejection chamber 3 is disposed in the center of the apparatus 1 in the longitudinal direction, and seal chambers 4 and 5 are disposed in front of and behind the fluid ejection chamber 3, respectively. Further, an ejector 6 is arranged at the outlet of the rear seal chamber 5.
[0035]
The fluid ejection chamber 3 has an inner wall portion 3 a having a circular cross section perpendicular to the traveling direction of the fiber bundle F, and the interior of the inner wall portion 3 a constitutes the traveling path 2 of the fiber bundle F. Further, a fluid storage chamber 3b is formed on the entire outer periphery of the inner wall portion 3a, and fluid is supplied to the fluid storage chamber 3b from a fluid supply port 3c.
[0036]
The fluid ejecting chamber 3 is formed with fluid ejecting surfaces 3d and 3d perpendicular to the traveling direction at two locations along the traveling direction. As shown in FIG. 3, the fluid ejection surface 3d is formed with six fluid ejection holes 3e that are displaced by 60 ° from each other along the radial direction of the inner wall surface 3a. The fluid injection hole 3e is formed in the fiber bundle F so as to open to the traveling path 2 and penetrate the fluid storage chamber 3b. The six fluid ejection holes 3e formed in the single fluid ejection surface 3d have their central axes intersecting at one point on the center line of the travel path 2.
[0037]
Furthermore, the central axis of the fluid injection hole 3e is formed to be 90 ° (right angle) with respect to the center line of the travel path 2, and the fluid supplied to the fluid storage chamber 3b is the same as the injection hole 3e. To the fiber bundle F traveling on the traveling path 2 with a perpendicular direction vector. In the present embodiment, all of the fluid ejection holes 3e have the same diameter, and the fluid storage chamber 3b is provided so that the fluid is ejected from the plurality of fluid ejection holes 3e with a uniform ejection pressure and ejection amount. Can do. It is also possible to individually connect a fluid supply pipe to each fluid ejection hole 3e and eject the fluid at a desired pressure and flow rate.
[0038]
In the seal chambers 4 and 5, cylindrical labyrinth seal structures 4b and 5b are inserted inside the housings 4a and 5a, and are fixed at specified positions by set bolts or the like. In the labyrinth seal structures 4b and 5b, a traveling path 2 having a circular cross section perpendicular to the traveling direction of the fiber bundle F is formed. In addition, the cross-sectional shape of the travel path 2 is not limited to a circle, and may be an ellipse or a polygon.
[0039]
Thus, in this embodiment, since the seal chambers 4 and 5 are arranged on both the front and rear sides of the fluid ejection chamber 3, the fluid ejection chamber 3 can be effectively sealed. That is, the pressure in the fluid ejection chamber 3 is kept uniform by interposing the seal chambers 4 and 5 between the fluid ejection chamber 3 in which the fluid is ejected and in a high pressure state and the outside of the apparatus at atmospheric pressure. . Accordingly, the fiber bundle F can be uniformly entangled in the longitudinal direction and the radial direction. Also, the internal pressure of the fluid ejection chamber 3 can be easily and highly 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.
[0040]
Further, in the present embodiment, since the seal chambers 4 and 5 having a labyrinth seal structure are employed in particular, the pressure in the seal chambers 4 and 5 is caused by the vortex flow formed in multiple stages from the fluid ejection chamber 3. It gradually decreases toward the outside of the device. Therefore, the entanglement imparted in the fluid ejection chamber 3 is further uniformized and stabilized in the seal chamber 5 on the outlet side (rear side) of the fluid ejection chamber 3.
[0041]
The seal chambers 4 and 5 prevent a sudden change in pressure in the vicinity of the fiber bundle entrance and exit of the fluid ejection chamber 3, and the fluid is ejected with a strong force at the entrance and exit of the fiber bundle to the confounding device 1. I can prevent it. Therefore, the fiber bundle F can travel stably, there is no yarn swinging, and damage due to contact with the entrance / exit of the apparatus 1 and the peripheral wall of the travel path 2 does not occur.
[0042]
As in this embodiment, the seal chambers 4 and 5 are most preferably provided at both the entrance and exit of the fluid ejection chamber 3, but the entrance and exit of the fluid ejection chamber 3 are taken into account in consideration of the installation space of the apparatus 1 and the like. It is also possible to provide a seal chamber only in one of the above.
[0043]
When entanglement is imparted to the carbon fiber precursor fiber bundle using the entanglement imparting device 1 described above, first, the fiber bundle is inserted into the running path 2 of the entanglement imparting device 1 using the ejector 6. When the fluid bundle is supplied to the ejector 6 from the fluid inlet 6a and the inside of the confounding device 1 is depressurized, the fiber bundle F is confounded when the fiber bundle is brought closer to the entry side of the running path 2 of the confounding device 1. It is inserted into the inside of the device 1 and threading is facilitated.
[0044]
After the fiber bundle F is inserted through the entanglement imparting device 1 in this way, the fiber bundle F is caused to travel and the device 1 is driven to impart entanglement to the fiber bundle F. The fiber bundle F inserted into the entanglement imparting 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 running path 2 of the entanglement imparting device 1.
[0045]
The fiber bundle F is introduced into the fluid ejection chamber 3 through the front seal chamber 4. In the fluid ejection chamber 3, first, fluid is ejected from the six fluid ejection holes 3 e on the front fluid ejection surface 3 d toward the entire circumference of the fiber bundle F with a 90 ° direction vector at a uniform pressure and a uniform flow rate. Entangling is applied, and then confounding is similarly applied to the rear fluid ejection surface 3d. That is, in the entanglement imparting device 1, fluid is ejected from the two cross sections perpendicular to the traveling direction to the fiber bundle F, and the fluid is fed to the fiber bundle F by a total of 16 fluid ejection holes 3 e. Be sprayed.
[0046]
In this way, since the entanglement is given sequentially by the two fluid ejecting surfaces 3d and 3d, the longitudinal direction of the fiber bundle and the entanglement imparting device in which the fluid is ejected and entangled at a single location and More uniform entanglement can be imparted in the radial direction. Therefore, also in the subsequent carbon fiber manufacturing process, the winding around the roll and the contact with the adjacent fiber bundle are reliably prevented, the process passing stability is improved, and the quality of the carbon fiber can be ensured.
[0047]
In addition, the entanglement is uniform in the longitudinal direction and the radial direction, there is no part of excessive entanglement locally, and entanglement is given in two stages, so that the degree of entanglement can be controlled with high accuracy, so that it will be opened later. Even when the fiber is necessary, the fiber bundle can be easily opened without applying an excessive load, and the carbon fiber is not deteriorated by the fiber opening.
[0048]
In addition, it is preferable to employ | adopt normal temperature air from a viewpoint of a price and handleability as the fluid used for confounding, and the quantity of the air supplied is the introduction pressure by the side of the fluid supply of the said confounding provision apparatus 1, ie, It adjusts suitably with the supply amount to the said fluid storage chamber 3b.
[0049]
An entanglement imparting device 1 ′ shown in FIG. 4 is a modified example of the entanglement imparting device 1 described above, and the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
The confounding imparting device 1 ′, which is a modification, is different from the device 1 described above only in the fluid ejection hole 3 e ′ in the fluid ejection chamber 3.
[0050]
The fluid ejecting chamber 3 of the confounding imparting device 1 ′ also includes two fluid ejecting surfaces 3d and 3d, and six fluid ejecting holes 3e ′ are formed on each fluid ejecting surface 3d. The six fluid ejection holes 3e ′ are displaced by 60 ° from each other along the radial direction of the inner wall surface 3a, and open to the traveling path 2 of the fiber bundle F and penetrate through the fluid storage chamber 3b. It has been. All the fluid ejection holes 3e ′ have the same diameter, and the central axes of the six fluid ejection holes 3e ′ all intersect at one point on the center line of the traveling path 2 of the fiber bundle F. Further, the angle D of the center axis of the fluid ejection hole 3e ′ with respect to the center line of the travel path 2 is formed to be about 60 °, and the fluid supplied to the fluid storage chamber 3b is allowed to flow into the ejection hole. Injected from 3e 'toward the fiber bundle F traveling on the traveling path 2 with a direction vector having a parallel flow of about 60 °.
[0051]
In the confounding imparting device 1 described above, the two fluid ejecting surfaces 3d are arranged at an interval in the fluid ejecting chamber 3. However, the fluid ejecting surface is not limited to two surfaces, and more fluid ejecting surfaces are provided. You can also. In the present invention, in order to provide uniform entanglement in the radial direction and the longitudinal direction of the fiber bundle, at least two fluid ejection surfaces are required, and preferably 2 to 5 surfaces. Moreover, although the space | interval of several fluid ejection surfaces is not restrict | limited in particular, 4 mm or more is preferable on apparatus manufacture, and in order to prevent the enlargement of an unnecessary apparatus, it is preferable that it is 20 mm or less.
[0052]
Further, in the confounding imparting devices 1 and 1 ′ shown in FIG. 1 and FIG. 4 described above, all of the six fluid ejection holes 3e and 3e ′ formed on one fluid ejection surface 3d have a central axis and a traveling path 2. The crossing angle with the center line is the same, that is, the fluid ejection angle (ejection direction vector) is the same, but the fluid ejection angles of the plurality of fluid ejection holes 3e, 3e 'of one fluid ejection surface 3d are the same as those of the present invention. It can also be varied by changing within a range (60 ° or more and 90 ° or less). However, also in this case, it is preferable that each injection hole intersects at one point on the center line of the traveling path 2 and the fluid injection holes facing each other by being displaced by 180 ° have the same fluid injection angle.
[0053]
When the fluid ejection angle is not less than 60 ° 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 fluid ejection holes is not limited to six, and it is sufficient that two or more fluid ejection holes are formed. When all the fluid ejection angles of the fluid ejection holes are 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.
[0054]
Such an entanglement imparting device of the present invention is often installed immediately before the removal of a carbon fiber precursor fiber bundle such as an acrylic fiber bundle, or is disposed anywhere in the carbon fiber production process as necessary. It is also possible to do.
[0055]
Hereinafter, the present invention will be described with specific examples and comparative examples.
In each of the examples and the comparative examples, the entanglement imparting process is performed on the fiber bundle using the entanglement imparting device described later. For each of the fiber bundles after treatment, the operational stability in the carbon fiber production process and the uniformity of the entanglement were evaluated, and the results are shown in Table 1. In addition, the uniformity of the entanglement is a CV value indicating a variation in the entanglement degree of the fiber bundle measured according to JIS-L1013. In this entanglement uniformity, an evaluation of x indicates that the degree of entanglement is extremely lower than the others.
[0056]
In the following examples and comparative examples,
Fiber bundle: 96 mol% of acrylonitrile
Single fiber tex: 0.11 Number of single fibers constituting the tex fiber bundle: 12000 Fluid: Tension of room temperature air fiber bundle having a pressure of 250 kilopascals on the fluid introduction side of the entanglement imparting device: 0.5 g / tex fiber bundle Passing speed: 10 m / min. These conditions are all the same.
[0057]
[Example 1]
In the entanglement processing apparatus 1 shown in FIG. 1 described above, three fluid ejection surfaces 3d are arranged in the fluid ejection chamber 3 at equal intervals along the traveling direction of the fiber bundle, and each fluid ejection surface 3d has a fluid ejection angle of 90. The fiber bundles were entangled using an entanglement imparting device in which six fluid injection holes (18 in total on three surfaces) at 60 ° were displaced by 60 ° and arranged at equal intervals.
The obtained fiber bundle has good convergence, and has excellent operation stability without any wrapping around a roll or interference with adjacent fiber bundles in the carbon fiber production process. In addition, the CV value of the entanglement uniformity is 7%, and the uniformity is extremely high. There were no excessively entangled parts, and the fiber opening was excellent.
[0058]
[Comparative Example 1]
In the confounding imparting apparatus used in Example 1, the confounding process was performed using the same apparatus as in Example 1 except that only one fluid ejection surface (total 6 fluid ejection holes) was used.
The obtained fiber bundle is provided with converging properties and can ensure the operational stability in the carbon fiber production process. However, the entanglement uniformity was as high as 13% and was not uniform. . Moreover, the opening property was also low.
[0059]
[Comparative Example 2]
In the confounding imparting apparatus used in Example 1, the confounding process was performed using the same apparatus as in Example 1 except that the fluid ejection angle from the fluid ejection hole was set to 30 °.
The obtained fiber bundle has low converging property, and winding around a roll or interference with an adjacent fiber bundle occurs in the carbon fiber production process, resulting in low operational stability. In addition, the degree of entanglement was uneven and the spreadability was poor.
[0060]
[Comparative Example 3]
In the confounding imparting device used in Example 1, the confounding is performed using the same device as in Example 1 except that the number of fluids formed on each fluid ejection surface is 1 (a total of 3 on 3 surfaces). Treated.
The obtained fiber bundle is provided with converging properties, and can ensure the operational stability in the carbon fiber production process. However, the entanglement uniformity was as high as 14% and was not uniform. . Moreover, the opening property was also bad.
[0061]
[Comparative Example 4]
The entanglement imparting device 1 of FIG. 1 does not include the fluid seal chambers 4 and 5 and has only one fluid ejection surface 3d in the fluid ejection chamber 3, and the fluid ejection surface 3d has a fluid ejection angle of 90. The fiber bundle was entangled using an entanglement imparting device in which only one fluid 3e at a temperature was formed.
The obtained fiber bundle is provided with converging properties and can ensure the operational stability in the carbon fiber production process, but the entanglement uniformity is as high as 14% and is not uniform.
[0062]
[Table 1]

[0063]
Thus, according to the entanglement imparting device to the carbon fiber precursor fiber bundle of the present invention, the fiber bundle has good convergence and can impart uniform entanglement in the longitudinal direction and the radial direction. By using such an entanglement imparting device, it becomes possible to maintain high operational stability in the carbon fiber production process, and at the same time, in high-order processes such as high-quality, high-quality carbon fiber bundles, and further, openability. It becomes possible to obtain a carbon fiber excellent in handling property.
[Brief description of the drawings]
FIG. 1 is a schematic view of a confounding device according to a preferred embodiment of the present invention.
2 is an arrow view taken along line AA in FIG. 1. FIG.
3 is a cross-sectional view taken along line BB in FIG.
4 is a schematic view of a confounding device according to a modification of the confounding device shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Confounding provision apparatus 2 Traveling path 3 of fiber bundles Fluid ejection chamber 3a Inner wall portion 3b Fluid storage chamber 3c Fluid supply port 3d Fluid ejection surface 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

Claims (5)

A confounding imparting device that imparts confounding by injecting a fluid to a carbon fiber precursor fiber bundle that runs continuously,
A fluid ejection chamber that ejects the fluid ; and a seal chamber that is disposed at least one of the inlet and the outlet of the carbon fiber precursor fiber bundle of the fluid ejection chamber and seals the fluid ejection chamber. An apparatus for imparting confounding to a carbon fiber precursor fiber bundle, which is characterized. In the fluid ejection chamber, a plurality of fluid ejection surfaces that cross the traveling path of the fiber bundle are arranged at a predetermined interval along the traveling path, and a plurality of fluid ejection holes that open to the traveling path are formed in each fluid ejection surface. And the center axis of each fluid ejection hole intersects the center line of the travel path, and the fluid ejection angle from the fluid ejection hole is relative to the travel direction of the fiber bundle. The entanglement imparting device for the carbon fiber precursor fiber bundle according to claim 1, wherein the device has a direction vector having a parallel flow of 60 ° or more and 90 ° or less. The seal chamber intermingling imparting device to a carbon fiber 維前 precursor fiber bundle according to claim 1, characterized in that a labyrinth seal structure. Intermingling application device to a carbon fiber 維前 precursor fiber bundle according to claim 1, characterized by being arranged that the ejector to the outlet of the carbon fiber precursor fiber bundle. Intermingling application device to a carbon fiber 維前 precursor fiber bundle according to claim 1, wherein the fluid is a gas.

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