JP2005256201A - Heat-treating oven and method for imparting flame retardance - Google Patents

Heat-treating oven and method for imparting flame retardance Download PDF

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JP2005256201A
JP2005256201A JP2004067029A JP2004067029A JP2005256201A JP 2005256201 A JP2005256201 A JP 2005256201A JP 2004067029 A JP2004067029 A JP 2004067029A JP 2004067029 A JP2004067029 A JP 2004067029A JP 2005256201 A JP2005256201 A JP 2005256201A
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yarn
heat treatment
roll
heat
treatment furnace
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Takashi Honda
隆 本田
Tetsushi Onishi
徹史 大西
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Toray Industries Inc
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Toray Industries Inc
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<P>PROBLEM TO BE SOLVED: To provide a heat-treating oven capable of preventing a yarn from winding around a conveying roll, easily and stably giving the heat treatment, and producing a flame retardant yarn, further a carbon fiber or the like in a good productivity, and a method for imparting flame retardance by using the same. <P>SOLUTION: This heat-treating oven for heat treating the yarn by circulating a heat treating gas within a heat-treating chamber having an entrance part and exit part of the traveling yarn is characterized by having a recessed groove facing to the entrance part and exit part, extending in circumferential direction and guiding the yarn, and arranging a roll for conveying the treated yarn having 5-30 μm range surface roughness Rmax in the recessed groove, and a method for imparting flame retardance by using the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、糸条を熱処理するための熱処理炉およびその熱処理炉を用いた耐炎化方法に関し、さらに詳しくは耐炎化処理すべき繊維束をロールへの巻き付きを発生させることなく安定して搬送し、優れた生産性をもって耐炎化繊維を製造することが可能な熱処理炉および耐炎化方法に関する。   The present invention relates to a heat treatment furnace for heat treating yarn and a flame resistance method using the heat treatment furnace. More specifically, the fiber bundle to be subjected to the flame resistance treatment is stably conveyed without causing winding around the roll. The present invention relates to a heat treatment furnace and a flameproofing method capable of producing flameproofed fibers with excellent productivity.

一般に前駆体繊維、たとえばポリアクリロニトリル系前駆体繊維を耐炎化する装置としては、たとえば特許文献１に示されている方法が知られている。すなわち、熱風吹き出し口と吸い込み口を糸条の通路の上下に備えた構造を持ち、熱処理室内に糸条の移送方向と平行な方向へ熱風を吹き出し、熱処理室の前後に糸条通過口がスリット状構造のシール室を設けることによって極めて均一な温度制御性を備えた熱処理炉を用いる方法である。この熱処理炉においては、走行糸条は熱処理室に対し適宜往復され、熱処理室の入口部および出口部には、走行方向を反転させるための搬送ロールが設けられる。   In general, as a device for making a precursor fiber, for example, a polyacrylonitrile-based precursor fiber flame resistant, for example, a method disclosed in Patent Document 1 is known. In other words, it has a structure with hot air outlets and suction ports above and below the yarn passage, hot air is blown into the heat treatment chamber in a direction parallel to the yarn transfer direction, and the yarn passage openings are slit before and after the heat treatment chamber. This is a method of using a heat treatment furnace having a very uniform temperature controllability by providing a seal chamber having a cylindrical structure. In this heat treatment furnace, the running yarn is appropriately reciprocated with respect to the heat treatment chamber, and conveyance rolls for reversing the running direction are provided at the inlet and the outlet of the heat treatment chamber.

このようなポリアクリロニトリル系前駆体繊維を耐炎化する熱処理炉より得られる耐炎化繊維束の品質、生産性を安定化させるためには、熱処理炉外に配設されている搬送ロールにおける巻き付き防止が不可欠となるが、従来装置においては巻き付き防止への配慮が十分になされていないために、搬送中に糸条の巻き付きがたびたび発生するという問題がある。   In order to stabilize the quality and productivity of the flame-resistant fiber bundle obtained from the heat treatment furnace for making such polyacrylonitrile-based precursor fibers flame resistant, it is necessary to prevent wrapping in the transport rolls arranged outside the heat treatment furnace. Although indispensable, the conventional apparatus does not sufficiently take into consideration the prevention of winding, so that there is a problem that the yarn is frequently wound during conveyance.

この問題に対し、特許文献２には、ブラシやバー、ブレードなどをロールに接触させて、糸条の巻き付きを防止し、巻き付きが発生した場合にはそれを早期に発見する方法が提案されているが、ロールの幅方向に均一にブラシ等を接触させるためには、押しつけ力を大きくする必要があり、ロールのメカニカルロスが大きくなり、ロール前後で搬送糸条に張力差が発生することとなり、安定生産の継続が困難になる可能性がある。   In order to solve this problem, Patent Document 2 proposes a method for preventing winding of a yarn by bringing a brush, a bar, a blade, or the like into contact with a roll, and detecting the winding early when it occurs. However, in order to make the brush contact uniformly in the roll width direction, it is necessary to increase the pressing force, which increases the mechanical loss of the roll and causes a tension difference in the conveyed yarn before and after the roll. This may make it difficult to continue stable production.

糸条の巻き付きが発生するメカニズムとして、上記のような熱処理炉で耐炎化する方法においては、アクリロニトリル系合成繊維を加熱および酸化することにより、シアン化合物やアンモニア、一酸化炭素およびアクリロニトリル前駆体に付与している油剤の分解物が走行糸条に付着し、ひいては、通常鏡面仕上げされている搬送ロールに転写し、単繊維がロールに粘着した粘着物に引き込まれて糸条の巻き付きが発生すると考えられる。前記粘着物の粘性を小さくする方法として、走行糸条のロールへの接触温度をコントロールすることで粘着性を小さくすることができ、コントロールする方法として、走行糸条を熱処理炉から離して自然冷却または、外気を吹き付け強制的に冷却する方法がある。しかし、そのような方法を用いた場合、熱処理炉を大きくする必要が生じ、また、熱処理炉の付帯設備が増え、熱処理炉の設備コストが高くなり、ひいては製造コストが高くなる。
特開平１０−２３７７２３号公報 特開２００２−１２３７１号公報 In the method of flame resistance in the heat treatment furnace as described above, as a mechanism of yarn winding, it is given to cyanide compounds, ammonia, carbon monoxide and acrylonitrile precursors by heating and oxidizing acrylonitrile-based synthetic fibers. It is thought that the decomposed product of the oiling agent attached to the running yarn is transferred to the transport roll, which is usually mirror-finished, and the single fiber is drawn into the adhesive that adheres to the roll, causing the winding of the yarn to occur. It is done. As a method of reducing the viscosity of the sticky material, the adhesiveness can be reduced by controlling the contact temperature of the running yarn to the roll. As a control method, the running yarn is separated from the heat treatment furnace and naturally cooled. Alternatively, there is a method of forcibly cooling by blowing outside air. However, when such a method is used, it is necessary to enlarge the heat treatment furnace, and the incidental equipment of the heat treatment furnace is increased, the equipment cost of the heat treatment furnace is increased, and the manufacturing cost is increased.
JP-A-10-237723 JP 2002-12371 A

本発明の課題は、かかる従来技術の問題点に鑑み、搬送ロールへの巻き付きを防止でき、容易にかつ安定して熱処理を施すことができ、優れた生産性をもって耐炎化繊維、さらには炭素繊維等を製造することが可能な熱処理炉、およびそれを用いた耐炎化方法を提供することにある。   In view of the problems of the prior art, the object of the present invention is to prevent wrapping around a transport roll, to easily and stably heat-treat, flame-resistant fiber, and carbon fiber with excellent productivity. And the like, and a flameproofing method using the same.

上記課題を解決するために、本発明に係る熱処理炉は、走行糸条の入口部および出口部を有する熱処理室内に加熱処理気体を循環させて糸条を熱処理する熱処理炉であって、前記入口部および出口部に対し、周方向に延び糸条を案内する凹溝を有し、該凹溝内の表面粗さ（最大高さ）Ｒｍａｘが５〜３０μｍの範囲にある被処理糸条を搬送するためのロールを配設したことを特徴とするものからなる。   In order to solve the above problems, a heat treatment furnace according to the present invention is a heat treatment furnace for heat treating a yarn by circulating a heat treatment gas in a heat treatment chamber having an inlet portion and an outlet portion of a running yarn, wherein the inlet Conveying yarn to be processed which has a groove extending in the circumferential direction and guiding the yarn to the outlet and the outlet, and having a surface roughness (maximum height) Rmax in the groove of 5 to 30 μm It consists of what is characterized by arrange | positioning the roll for doing.

本発明に係る耐炎化方法は、このような熱処理炉を用いて糸条を耐炎化することを特徴とする方法からなる。   The flameproofing method according to the present invention comprises a method characterized by flameproofing a yarn using such a heat treatment furnace.

この耐炎化方法においては、たとえば、ポリアクリロニトリル系前駆体からなる糸条が熱処理炉に導入される。また、この糸条は、生産性を向上するためには、ポリアクリロニトリル系前駆体の総フィラメント数が１０，０００本以上であることが好ましい。さらに、実質的に無撚りであるポリアクリロニトリル系炭素繊維前駆体を耐炎化することが好ましい。耐炎化された繊維は、続いて炭化処理が施されることにより、炭素繊維が製造される。   In this flameproofing method, for example, a yarn made of a polyacrylonitrile-based precursor is introduced into a heat treatment furnace. In order to improve the productivity of this yarn, it is preferable that the total number of filaments of the polyacrylonitrile-based precursor is 10,000 or more. Furthermore, it is preferable to make the polyacrylonitrile-based carbon fiber precursor which is substantially untwisted flameproof. The flame-resistant fiber is subsequently carbonized to produce carbon fiber.

本発明は、前記課題、つまり被処理繊維束としての糸条を搬送するためのロールへの巻き付きを減少させ、かつ安定で、生産性に優れた耐炎化繊維、さらには炭素繊維の製造方法について、鋭意検討し、特定の熱処理炉で耐炎化処理してみたところ、かかる課題を一挙に解決することを究明したものである。すなわち、搬送ロールの表面の粗度を特定の範囲の表面粗さとして適正化することによって、粘着物のロールへの転写を抑制し、巻き付きを防止することによって、安定した品質の耐炎化繊維、さらには炭素繊維を製造することができたものである。   The present invention relates to a method for producing the above-mentioned problem, that is, a flame-resistant fiber that reduces winding around a roll as a bundle of fibers to be treated, and is stable and excellent in productivity, and further a carbon fiber. As a result of diligent examination and flame-proofing treatment in a specific heat treatment furnace, it was clarified that such problems could be solved all at once. That is, by optimizing the roughness of the surface of the transport roll as a specific range of surface roughness, suppressing the transfer of the adhesive to the roll and preventing wrapping, stable flame-resistant fibers, Furthermore, the carbon fiber could be manufactured.

本発明に係る熱処理炉によれば、凹溝付きの搬送ロールが使用されることにより走行糸条の搬送経路が安定して所定の経路に保たれ、凹溝内の表面が特定の範囲の表面粗さ、すなわち従来の鏡面仕上げされた表面に比べて特定の範囲の粗い表面とされることにより、粘着物のロールへの転写が抑制されて、糸条はその搬送面としての凹溝内の表面に対し粘着しにくくなり、ロールへの巻き付きが防止される。   According to the heat treatment furnace according to the present invention, by using a conveyance roll with a concave groove, the conveyance path of the running yarn is stably maintained in a predetermined path, and the surface in the concave groove is a surface in a specific range. Roughness, that is, a rough surface in a specific range compared to a conventional mirror-finished surface, the transfer of the sticky material to the roll is suppressed, the yarn in the concave groove as its conveying surface It becomes difficult to adhere to the surface, and winding around the roll is prevented.

そしてこのような搬送ロールへの巻き付きが防止された熱処理炉を用いて耐炎化処理を行うことにより、生産を安定して継続することが可能になる。搬送ロールに凹溝を設けるとともに凹溝内の表面を適切な特定の範囲内の粗さにするだけの簡単な改良で済むから、設備費を大きく増大させることはない。したがって、安価に、優れた生産性を達成でき、優れた生産性により、耐炎化繊維、さらには炭素繊維等を安価に製造することも可能になる。   And it becomes possible to continue production stably by performing a flame-proofing process using the heat-treatment furnace in which the winding to the conveyance roll was prevented. Since a simple improvement is required only by providing a concave groove on the transport roll and making the surface in the concave groove within an appropriate specific range, the equipment cost is not greatly increased. Therefore, it is possible to achieve excellent productivity at low cost, and it becomes possible to produce flame resistant fibers, carbon fibers, and the like at low cost due to the excellent productivity.

以下に、本発明の望ましい実施の形態について、図面を参照しながら説明する。
図１は、本発明の一実施態様に係る耐炎化処理される繊維糸条を搬送するロールを熱処理炉外に設けた熱処理炉の一例を示す概略構成図である。この熱処理炉１は、熱処理炉１内の熱処理室４内に加熱処理気体を循環させて複数の糸条（図１において、紙面と垂直の方向に配列された複数の糸条）を熱処理する熱処理炉である。この熱処理炉１においては、耐炎化繊維糸条２を熱処理室４に対して複数回往復するように搬送するための搬送ロール３が、熱処理室４の各入口部および出口部に対して配設されている。各ロール３は、図２に示すように、周方向に環状に延びる凹溝５を有しており、複数の凹溝５がロール長手方向に配列されている。このような凹溝５を設けることにより、凹溝のない平面ロールに比べ、繊維束を凹溝５により幅規制することができ、それによって繊維束内の集束性が高くなり、また繊維束同士の絡みもなく容易に分割が可能になる。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating an example of a heat treatment furnace in which a roll for conveying a fiber yarn subjected to flame resistance treatment according to an embodiment of the present invention is provided outside the heat treatment furnace. The heat treatment furnace 1 is a heat treatment in which a heat treatment gas is circulated in a heat treatment chamber 4 in the heat treatment furnace 1 to heat-treat a plurality of yarns (a plurality of yarns arranged in a direction perpendicular to the paper surface in FIG. 1). It is a furnace. In the heat treatment furnace 1, a transport roll 3 for transporting the flameproof fiber yarn 2 so as to reciprocate a plurality of times with respect to the heat treatment chamber 4 is provided for each inlet and outlet of the heat treatment chamber 4. Has been. As shown in FIG. 2, each roll 3 has a concave groove 5 that extends annularly in the circumferential direction, and a plurality of concave grooves 5 are arranged in the roll longitudinal direction. By providing such a concave groove 5, the width of the fiber bundle can be restricted by the concave groove 5 as compared with a flat roll without a concave groove, thereby increasing the convergence in the fiber bundle, and between the fiber bundles. It becomes possible to divide easily without entanglement.

この凹溝５内の表面、つまり、凹溝５の底面および両側面の表面粗さＲｍａｘが、５〜３０μｍに加工されている。この表面粗さＲｍａｘは、ＪＩＳ Ｂ０６０１に規定されている基準に基づくものである。この凹溝５は、走行糸条を案内し、糸条への接糸面となるが、上記表面粗さによるロールの接糸面の凹凸は、糸条やその単繊維のロールへの接触面積を減少させる役割を持っており、小さすぎると減少効果小さく、また、大きすぎると、単繊維のロールへの接糸部分の応力が大きくなり、単糸切れの原因となる。また、上記のように適切に粗い表面とすることにより、糸条からの粘着物も付着しにくくなり、単糸が粘着物によって引き込まれ、糸条が巻き付くことも防止される。より好ましいＲｍａｘは、１０〜２０μｍの範囲である。   The surface roughness Rmax of the surface in the groove 5, that is, the bottom surface and both side surfaces of the groove 5 is processed to 5 to 30 μm. This surface roughness Rmax is based on a standard defined in JIS B0601. The groove 5 guides the running yarn and serves as a yarn contact surface to the yarn. The unevenness of the yarn contact surface of the roll due to the surface roughness is the contact area of the yarn or its single fiber to the roll. If it is too small, the reduction effect is small, and if it is too large, the stress of the yarn-contacting portion of the single fiber on the roll increases, causing single yarn breakage. Further, by appropriately making the surface rough as described above, the sticky material from the yarn becomes difficult to adhere, and the single yarn is pulled in by the sticky material and the yarn is prevented from being wound. More preferable Rmax is in the range of 10 to 20 μm.

上記ロール３の表面には硬質クロムメッキが施されているのが好ましく、これによりロールの更新周期を長くできる。   It is preferable that the surface of the roll 3 is plated with hard chrome, whereby the roll renewal cycle can be lengthened.

上記ロール３の直径としては、１５０〜４００ｍｍの範囲であることが好ましく、ロールの直径が小さすぎると、円周方向の距離が短くなり粘着した単繊維がロールから離れる前に繊維束の接糸面に巻き込まれることにより巻き付きに発展するおそれがある。また、大きい方には制限はないが、大きすぎると慣性が大きくなり、また設備も大がかりなものとなるため、この面からは、２００〜３５０ｍｍの範囲であることが好ましい。   The diameter of the roll 3 is preferably in the range of 150 to 400 mm. If the diameter of the roll is too small, the circumferential distance is shortened, and the fiber bundle is threaded before the adhered single fiber leaves the roll. There is a risk of developing into wrapping by being caught on the surface. Moreover, although there is no restriction | limiting in the larger one, since an inertia will become large and an installation will also become large if it is too large, From this surface, it is preferable that it is the range of 200-350 mm.

糸条のロールへの接触角（巻付け角）は、９０〜１８０°の範囲であることが好ましく、接触角が小さすぎると、繊維束に対するロールの把持力が小さくなり、ロールのメカロス等により回転斑が発生し、単糸毛羽の発生や品質斑が発生するおそれがある。   The contact angle (winding angle) of the yarn to the roll is preferably in the range of 90 to 180 °. If the contact angle is too small, the gripping force of the roll with respect to the fiber bundle becomes small, and due to the mechanical loss of the roll, etc. Rotation spots may occur, and single yarn fluff and quality spots may occur.

以下に本発明の実施例および比較例を具体的に説明する。
図１に示した熱処理炉１を用いた。被処理物である走行糸条２を案内するために、熱処理室４の各入口部および出口部に対して上記搬送ロール３（実施例１）を設け、熱処理室４内に加熱処理気体を循環させて、ロール３によって加熱処理室内を蛇行して搬送させ、耐炎化処理を行った。 Examples of the present invention and comparative examples will be specifically described below.
The heat treatment furnace 1 shown in FIG. 1 was used. In order to guide the traveling yarn 2 that is an object to be processed, the above-described transport roll 3 (Example 1) is provided for each inlet and outlet of the heat treatment chamber 4, and the heat treatment gas is circulated in the heat treatment chamber 4. Then, the roll 3 meandered and was conveyed in the heat treatment chamber to perform flameproofing treatment.

実施例１
図１の熱処理炉で、実質的に無撚りで、総フィラメント数５０，０００本のポリアクリロニトリル前駆体１００糸条を、該熱処理炉の入口部および出口部に直径２００ｍｍの搬送ロールを設け、ロールの凹溝内の表面に表面粗さＲｍａｘが１０μｍの硬質クロムメッキを施した。ロール面長方向に１５ｍｍ毎に円周方向に延びる環状の凹溝を有する搬送ロールで前駆体を送り、２３０℃で約５ｔ連続に耐炎化処理したところ、糸条の巻き付きもなく安定して耐炎化処理できた。また、生産が終了した時点で検査したところ、該搬送ロールの表面には単繊維の巻き付きもなかった。 Example 1
In the heat treatment furnace of FIG. 1, a polyacrylonitrile precursor 100 yarn having a total number of 50,000 filaments, which is substantially untwisted, is provided with a transport roll having a diameter of 200 mm at the inlet and outlet of the heat treatment furnace. Hard chrome plating with a surface roughness Rmax of 10 μm was applied to the surface in the groove. When the precursor is fed with a transport roll having an annular concave groove extending in the circumferential direction every 15 mm in the roll surface length direction and subjected to flame resistance treatment at 230 ° C. for about 5 tons continuously, there is no flame winding and stable flame resistance. Was able to be processed. Moreover, when it inspected at the time of completion | finish of production, there was no winding of a single fiber on the surface of this conveyance roll.

比較例１
同じく図１の熱処理炉で、実質的に無撚りで、総フィラメント数５０，０００本のポリアクリロニトリル前駆体１００糸条を、該熱処理炉の入口部および出口部に直径２００ｍｍの搬送ロールを設け、ロールの凹溝内の表面粗さＲｍａｘを３μｍとする硬質クロムメッキを施し１５ｍｍ毎に円周方向に凹溝を設けた搬送ロールで前駆体を送り、同様に２３０℃で耐炎化処理したところ、約５ｔの耐炎化処理を行ったが、処理の途中で３繊維束の巻き付きが発生した。また、生産が終了した時点で検査したところ、該搬送ロールの表面に１００糸条中１５糸条の単繊維の巻き付きを確認した。 Comparative Example 1
Similarly, in the heat treatment furnace of FIG. 1, a polyacrylonitrile precursor 100 yarn having a total number of filaments of 50,000, which is substantially untwisted, is provided with a transport roll having a diameter of 200 mm at the inlet and outlet of the heat treatment furnace, When the precursor is sent by a transport roll having a hard chrome plating with a surface roughness Rmax of 3 μm in the concave groove of the roll and provided with a concave groove in the circumferential direction every 15 mm, and similarly flameproofed at 230 ° C., Although a flameproofing treatment of about 5 t was performed, winding of three fiber bundles occurred during the treatment. Moreover, when it inspected when production was complete | finished, the winding of the single fiber of 15 yarns in 100 yarns was confirmed on the surface of this conveyance roll.

比較例２
同じく図１の熱処理炉で、実質的に無撚りで、総フィラメント数５０，０００本のポリアクリロニトリル前駆体１００糸条を、該熱処理炉の入口部および出口部に直径２００ｍｍの、円周方向に凹溝のない搬送ロールを設け、ロール表面に表面粗さＲｍａｘが１０μｍの硬質クロムメッキを施し、該搬送ロールで前駆体を送り、同様に２３０℃で耐炎化処理したところ、約５ｔの耐炎化処理を行ったが、処理の途中で１０繊維束の巻き付きが発生し、生産継続不能となった。生産終了後の該搬送ロールの表面に１００糸条中８０糸条の単繊維の巻き付きを確認した。 Comparative Example 2
Similarly, in the heat treatment furnace of FIG. 1, 100 polyacrylonitrile precursor yarns having a total number of filaments of 50,000, which are substantially untwisted, are arranged in the circumferential direction with a diameter of 200 mm at the inlet and outlet of the heat treatment furnace. A transport roll without a concave groove is provided, the surface of the roll is hard chrome plated with a surface roughness Rmax of 10 μm, the precursor is fed with the transport roll, and similarly subjected to a flame resistance treatment at 230 ° C. Although the treatment was performed, winding of 10 fiber bundles occurred in the middle of the treatment, making it impossible to continue production. The winding of the single fiber of 80 yarns out of 100 yarns was confirmed on the surface of the transporting roll after the end of production.

これらの結果をまとめて表１に示す。表１に示すように、凹溝のない搬送ロール（比較例２）では糸条の巻き付き、単繊維の巻き付きが共に発生した。凹溝を有する搬送ロールを用いても、その凹溝内の表面粗さが本発明の範囲外であると（比較例１）、糸条の巻き付き、単繊維の巻き付き共に防止することはできなかった。凹溝内の表面粗さを本発明で規定した特定の範囲内にすることにより（実施例１）、糸条の巻き付き、単繊維の巻き付き共に防止することができることが確認された。   These results are summarized in Table 1. As shown in Table 1, both the winding of the yarn and the winding of the single fiber occurred in the transport roll without the groove (Comparative Example 2). Even if a conveyance roll having a concave groove is used, if the surface roughness in the concave groove is outside the scope of the present invention (Comparative Example 1), it is impossible to prevent both the winding of the yarn and the winding of the single fiber. It was. It was confirmed that both the winding of the yarn and the winding of the single fiber can be prevented by setting the surface roughness in the concave groove within the specific range defined in the present invention (Example 1).

Figure 2005256201
Figure 2005256201

このように、本発明は、とくに実質的に無撚りで、総フィラメント数が１０，０００本以上のポリアクリロニトリル系前駆体繊維束などを耐炎化する熱処理炉およびその耐炎化方法として好適であり、ロールの凹溝表面に表面粗さＲｍａｘが５〜３０μｍの硬質クロムメッキを施し、例えば直径２００ｍｍの溝付きロールに１８０°の接触角で搬送することにより、耐炎化工程での巻き付きを抑制でき、安定に、かつ、円滑、迅速に耐炎化処理を行うことができ、安定にこのプロセスを通過させて生産性を向上させた炭素繊維製造方法にそれに用いて好適な熱処理炉および耐炎化方法を提供することができる。   As described above, the present invention is particularly suitable as a heat treatment furnace for making a polyacrylonitrile-based precursor fiber bundle having substantially no twist and a total number of filaments of 10,000 or more flame resistant and a method for making the flame resistant. By applying hard chrome plating with a surface roughness Rmax of 5 to 30 μm to the concave groove surface of the roll, for example, by conveying it to a grooved roll with a diameter of 200 mm at a contact angle of 180 °, winding in the flameproofing process can be suppressed, Providing a heat treatment furnace and a flameproofing method suitable for use in a carbon fiber manufacturing method capable of stably, smoothly and quickly performing a flameproofing process and improving the productivity by passing through this process stably. can do.

本発明に係る熱処理炉および耐炎化方法は、とくに耐炎化処理を必要とする用途に好適であり、中でも、炭素繊維製造工程に用いて好適なものである。   The heat treatment furnace and flameproofing method according to the present invention are particularly suitable for applications that require flameproofing, and are particularly suitable for use in carbon fiber production processes.

本発明の一実施態様に係る熱処理炉の概略構成図である。It is a schematic block diagram of the heat processing furnace which concerns on one embodiment of this invention. 図１における搬送ロールの拡大部分断面図である。It is an expanded partial sectional view of the conveyance roll in FIG.

符号の説明Explanation of symbols

１ 熱処理炉
２ 糸条
３ ロール
４ 熱処理室
５ 凹溝 1 Heat Treatment Furnace 2 Yarn 3 Roll 4 Heat Treatment Room 5 Groove

Claims (5)

走行糸条の入口部および出口部を有する熱処理室内に加熱処理気体を循環させて糸条を熱処理する熱処理炉であって、前記入口部および出口部に対し、周方向に延び糸条を案内する凹溝を有し、該凹溝内の表面粗さＲｍａｘが５〜３０μｍの範囲にある被処理糸条を搬送するためのロールを配設したことを特徴とする熱処理炉。   A heat treatment furnace for heat treating a yarn by circulating a heat treatment gas in a heat treatment chamber having an inlet portion and an outlet portion of a traveling yarn, and guides the yarn extending in a circumferential direction with respect to the inlet portion and the outlet portion. A heat treatment furnace characterized in that a roll is provided for conveying a processed yarn having a groove and having a surface roughness Rmax in the range of 5 to 30 μm in the groove. 請求項１に記載の熱処理炉を用いて糸条を耐炎化することを特徴とする耐炎化方法。   A flameproofing method comprising flameproofing a yarn using the heat treatment furnace according to claim 1. ポリアクリロニトリル系前駆体からなる糸条を熱処理炉に導入することを特徴とする、請求項２に記載の耐炎化方法。   The flameproofing method according to claim 2, wherein a yarn comprising a polyacrylonitrile-based precursor is introduced into a heat treatment furnace. 前記糸条は、ポリアクリロニトリル系前駆体の総フィラメント数が１０，０００本以上であることを特徴とする、請求項３に記載の耐炎化方法。   4. The flameproofing method according to claim 3, wherein the yarn has a total number of filaments of a polyacrylonitrile-based precursor of 10,000 or more. 実質的に無撚りであるポリアクリロニトリル系炭素繊維前駆体を耐炎化することを特徴とする、請求項３または４に記載の耐炎化方法   The flameproofing method according to claim 3 or 4, characterized in that a polyacrylonitrile-based carbon fiber precursor that is substantially untwisted is flameproofed.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021090641A1 (en) * 2019-11-06 2021-05-14 東レ株式会社 Method for manufacturing carbon fiber bundle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021090641A1 (en) * 2019-11-06 2021-05-14 東レ株式会社 Method for manufacturing carbon fiber bundle

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