JPS60167928A - Method for infusibilizing pitch based carbon fiber and apparatus therefor - Google Patents

Abstract

PURPOSE:To eliminate fusion or ignition of fibers, etc. and reduce the fluctuation in oxygen content, by passing an oxidizing gas through fibers to be treated in the thickness direction thereof while running a layer of the fibers in a treating furnace. CONSTITUTION:A net conveyor 2 put in a treating furnace 1 is provided with pairs of sollers (3a) and (4a) respectively, and the interior of the treating furnace 1 is substantially sealed from the outside air. Both edges of the net conveyor 2 in the longitudinal direction thereof are also sealed to divide the interior of the treating furnace 1 into the upper and lower spaces (A) and (B). Discharge holes (9a) and (9b) for gases are perforated on the furnace wall opposite to an inlet hole 8 for an oxidizing gas with respect to the net conveyor 2.

Description

【発明の詳細な説明】 技術分野 本発明はピッチ系炭素繊維の不融化処理に関する。更に
詳しくは均一な不融化処理を可能にする方法並びに装置
に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to infusibility treatment of pitch-based carbon fibers. More specifically, the present invention relates to a method and apparatus that enable uniform infusibility treatment.

従来技術 溶融したピッチ原料を紡糸ノズルから吐出して得られた
ピッチ系炭素繊維はとのま＼の状態で再び加熱すると溶
融して繊維状をなさなくなるので、炭化、賦活処理等の
活性化処理を施こす前に、不融化処理を行なうことが必
要である。この不融化処理は酸化性雰囲気下で被処理繊
維層にピッチの発火点（５００℃ン以下の熱処理を施こ
し繊維の分子構造中に酸素を取入れて炭素原子同士を架
橋結合させその軟化点を上昇せしめるものである。Prior Art Pitch-based carbon fiber obtained by discharging molten pitch raw material from a spinning nozzle melts and loses its fibrous form when heated again in its original state, so activation treatments such as carbonization and activation treatments are required. It is necessary to carry out an infusible treatment before applying this. This infusibility treatment involves heat-treating the fiber layer to be treated in an oxidizing atmosphere at a temperature below the ignition point of the pitch (500°C) to introduce oxygen into the molecular structure of the fiber and cross-link carbon atoms to lower the softening point. It is something that makes you rise.

しかしこの反応は発熱反応であって、発生した熱が繊維
層の内部に蓄えられて温度の上昇を招き、繊維の溶融や
発火に至る危険がある。これを防ぐために処理温度を６
０℃前後の低温とし、オゾン雰囲気下での処理が提案さ
れているが、繊維層の密度が大きい場合には矢張シ内部
蓄熱は避けられず前述の問題が生じる。更に従来の不融
化処理においては炉内で繊維層に対して単にその表面に
沿って熱風を作用せしめておシ、繊維層の内部には表面
を通じて拡散によって侵透する気体のみが作用する処理
方式であるため、層の厚さ方向に沿って酸素の含有量が
減少し、その結果、賦活処理さ訃た後の活性炭素繊維の
微細孔の数及び孔径に差を生じ、バラツキの多い比表面
積を有する製品どなってしまう欠点があった。However, this reaction is an exothermic reaction, and the generated heat is stored inside the fiber layer, leading to an increase in temperature, which poses a risk of melting the fibers or igniting them. To prevent this, the processing temperature was increased to 6.
Treatment at a low temperature of around 0° C. and under an ozone atmosphere has been proposed, but if the density of the fiber layer is high, heat accumulation inside the fiber layer is unavoidable and the above-mentioned problem occurs. Furthermore, in conventional infusibility treatment, hot air is simply applied to the fiber layer along its surface in a furnace, and only gas that diffuses through the surface acts on the inside of the fiber layer. Therefore, the oxygen content decreases along the thickness direction of the layer, resulting in differences in the number and pore diameter of micropores in the activated carbon fibers after the activation treatment, and the specific surface area varies widely. There was a drawback that products with

発明の目的及び構成 本発明はかかる従来技術の欠点に鑑みガされたものであ
シ、繊維の溶着又は発火等の危険がなく、シかも酸素含
有量のバラツキの少ない良好な不融化処理を可能にする
方法並びに装置を提案することを目的とする。Object and Structure of the Invention The present invention has been developed in view of the drawbacks of the prior art, and it is possible to perform a good infusibility treatment without the risk of fiber welding or ignition, and with little variation in oxygen content. The purpose is to propose a method and device for

即ち本発明はナフサピッチ、コールタールピッチ等を原
料とする、溶融紡糸によって得られたピッチ系炭素繊維
の不融化処理方法であって、被処理繊維層を連続的に処
理炉内を進行せしめつつ、酸化性ガスを該繊維層の厚さ
方向に強制的に貫通せしめることを特徴とするピッチ系
炭素繊維の不融化処理方法であシ、又この方法を実施す
るのに好適な、入口から出口へ向って走行するネットコ
ンベアを具え、且つ該入口、出口及び側面部が実質的に
気密にシールされている処理炉を具えたピッチ系炭素繊
維の不融化のための連続処理装置であって、前記処理炉
には前記ネットコンベアに関して互いに反対側の壁面に
酸化性ガスの導入孔と排出孔が設けられていることを特
徴とするピッチ系炭素繊維の不融化処理装置である。That is, the present invention is a method for infusibility treatment of pitch-based carbon fiber obtained by melt spinning using naphtha pitch, coal tar pitch, etc. as a raw material, in which a fiber layer to be treated is continuously advanced through a treatment furnace, A pitch-based carbon fiber infusibility treatment method characterized by forcing an oxidizing gas to pass through the fiber layer in the thickness direction, and a method suitable for carrying out this method from an inlet to an outlet. 1. A continuous treatment apparatus for infusibility of pitch-based carbon fibers, comprising a treatment furnace having a net conveyor running toward the furnace and having an inlet, an outlet, and a side surface substantially hermetically sealed, the apparatus comprising: This apparatus is characterized in that the processing furnace is provided with an oxidizing gas introduction hole and an oxidizing gas discharge hole on opposite wall surfaces with respect to the net conveyor.

実施例 以下図面に示す実施例に基いて本発明を更に詳細に説明
する。EXAMPLES The present invention will be explained in more detail below based on examples shown in the drawings.

第１図には本発明の第１実施例にかかる処理装置の概略
側断面図が示されている。FIG. 1 shows a schematic side sectional view of a processing apparatus according to a first embodiment of the present invention.

この装置においては、処理炉ｌはその中央部を貫通して
ネットコンベア２が張設されておシ、その人口３．出口
４には夫々一対のローラ３ａ。In this device, a processing furnace 1 has a net conveyor 2 extending through its center, and has a population of 3. Each outlet 4 has a pair of rollers 3a.

４ａがコンベア２を挾持するように設けられている。こ
のローラ３ａ　、４ａによって処理炉ｌの内部は外気か
ら実質的にシールされている。4a is provided so as to sandwich the conveyor 2. The interior of the processing furnace I is substantially sealed from the outside air by these rollers 3a and 4a.

又ネットコンベア２は、第２図に示すように、その長手
方向の両側縁は無孔のスチールベルト５で構成されてお
シ、該ベルト５を処理炉ｌの内側壁に設けられたシール
兼用ガイド６に沿って摺動せしめながら進行する。これ
によって炉１の内部は上部空間Ａと下部空間Ｂとに区分
され両者間は実質的にネットコンベア２の中央のネット
部分７を通じてのみ連通するようになされている。In addition, as shown in FIG. 2, the net conveyor 2 is constructed of non-porous steel belts 5 on both sides in the longitudinal direction, and the belts 5 are also used as seals provided on the inner wall of the processing furnace 1. It advances while sliding along the guide 6. As a result, the inside of the furnace 1 is divided into an upper space A and a lower space B, and the two are communicated substantially only through the central net portion 7 of the net conveyor 2.

処理炉ｌの出口側の壁面には酸化性ガスの導入孔８が穿
設され、又ネットコンベア２に関して前記導入孔８と反
対側の炉壁にはガスの排出孔９ａ及び９ｂが穿設されて
いる。An oxidizing gas introduction hole 8 is formed in the wall surface on the exit side of the processing furnace 1, and gas discharge holes 9a and 9b are formed in the furnace wall on the opposite side of the introduction hole 8 with respect to the net conveyor 2. ing.

又処理炉ｌ内にはこれをネットコンベア２の進行方向に
二つのチャンバｌｏａ、Ｊｏｂに区分する隔１３１１１
がネットコンベア２の進行を阻げないような方法で設け
られている。前記ガス排出孔９ａ。In addition, there is a gap 13111 inside the processing furnace 1 that divides it into two chambers loa and job in the direction of movement of the net conveyor 2.
is provided in such a way that the progress of the net conveyor 2 is not obstructed. The gas exhaust hole 9a.

９ｂは夫々チャンバ１ｏａｔｌｏｂ内に位置するように
配置されている。又隔壁１１には前記上部空間Ａ内のあ
る部分に開口１２が設けられ、両チャンバｌＱａ、１０
ｂを連通している。9b are arranged so as to be located within the chamber 1oatlob, respectively. Further, an opening 12 is provided in a certain part of the upper space A in the partition wall 11, and both chambers lQa, 10
b is connected.

このような構成の処理装置において、不融化されるべき
繊維はネットコンベア２上に適当な厚さの層１３をなす
ように積載された状態で入口３から処理炉ｌ内に連続的
に供給される。一方たとえば２７０℃程度の適温に加熱
された酸化性のガスは導入孔８を通じてチャンバ】Ｏａ
Ｏ上術空間Ａ内に導入される。該ガスは炉内を進行中の
ネットコンベア２上の繊維層１３を貫通して下部曳間Ｂ
に移動し、排出孔９ａから排出されるが、繊維層１３を
通過する際に層内の繊維に対して均一に接触するので増
勢な不融化処理が力される。In the processing apparatus having such a configuration, the fibers to be infusible are loaded on the net conveyor 2 in a layer 13 of an appropriate thickness and are continuously fed into the processing furnace l from the inlet 3. Ru. On the other hand, an oxidizing gas heated to an appropriate temperature of, for example, about 270°C is introduced into the chamber through the introduction hole 8.
O is introduced into the surgical space A. The gas passes through the fiber layer 13 on the net conveyor 2 that is moving inside the furnace and reaches the lower pulling gap B.
, and is discharged from the discharge hole 9a, but when passing through the fiber layer 13, it comes into uniform contact with the fibers in the layer, so that an increased infusibility treatment is applied.

導入されたガスの一部は隔壁１１の開口１２を通じてチ
ャンバ９ｂ内にも供給されるが、該ガスは導入孔８から
かなシの距離を経ているので当初の温度よシ低温（たと
えば２００℃）と々っている。A part of the introduced gas is also supplied into the chamber 9b through the opening 12 of the partition wall 11, but since the gas has passed a distance of about 100 ft from the introduction hole 8, the temperature is lower than the initial temperature (for example, 200°C). It's so hot.

この低温ガスもまた前述と同様に繊維層１３を貫通して
排出孔９ｂを通じて排出され、その間に繊維に対して均
一な酸化処理を行なう。This low-temperature gas also passes through the fiber layer 13 and is discharged through the discharge hole 9b in the same manner as described above, during which time the fibers are uniformly oxidized.

即ちネットコンベア２上の繊維層１３は炉内に導入され
ると先ずチャンバ１９）ｂ内で比較的低温の酸化性ガス
によって貫通されて予備的々前処理を受け、次にチャン
バ序）ａに至って高温の酸化性ガスの透過によって本格
的な不融化のための後処理を受けることとなる。That is, when the fiber layer 13 on the net conveyor 2 is introduced into the furnace, it is first penetrated by a relatively low-temperature oxidizing gas in the chamber 19)b and subjected to preliminary pretreatment, and then transferred to the chamber 19)a. As a result, the material undergoes post-treatment for full-scale infusibility due to the permeation of high-temperature oxidizing gas.

このように二段の処理によシ、シかも繊維層を貫通する
ガスによる均一処理によυ、ピッチ系炭素繊維は充分な
不融化特性を有することとなる。In this manner, by the two-stage treatment and by the uniform treatment with the gas that penetrates the fiber layer, the pitch-based carbon fiber has sufficient infusibility properties.

第３図には本発明の第２実施例の処理装置を示す。FIG. 3 shows a processing apparatus according to a second embodiment of the present invention.

この装置も本質的には第１実施例の装置と同じであるが
、異なる点はガス導入孔を炉の出口側のチャンバｌｏａ
の壁面に設けた８ａのみでなく、入口側のチャンバ１０
ｂの壁面にも８ｂとして設け、更に両チャンバを距でる
隔壁１１に設けられていた開口１２を廃して両者をより
完全に隔離した点にある。This device is essentially the same as the device of the first embodiment, but the difference is that the gas inlet hole is placed in the lower chamber on the outlet side of the furnace.
In addition to the chamber 8a provided on the wall of the chamber 10 on the entrance side,
8b is also provided on the wall of chamber b, and furthermore, the opening 12 provided in the partition wall 11 that extends between the two chambers is eliminated to more completely isolate the two chambers.

この装置によれば第１のチャンバ１０ｂと第２のチャン
バ１０ａとに導入される酸化性ガスとして組成の異なる
ものを用いることができる利点がある。This apparatus has the advantage that gases having different compositions can be used as the oxidizing gases introduced into the first chamber 10b and the second chamber 10a.

たとえばガス導入孔８ｂからは低温のオゾン含有ガスを
第１チヤンバ１０ｂ内に導入して、未だ軟化点の低いピ
ッチ繊維に低温での予備酸化を施こして充分な酸素を取
込オせた上で、今度はガス導入孔８ａから高温の酸素含
有ガスを第２チヤンバ１０ａ内に導入して本格的な不融
化処理を行なうことが可能となる。For example, low-temperature ozone-containing gas is introduced into the first chamber 10b from the gas introduction hole 8b, and the pitch fibers, which still have a low softening point, are pre-oxidized at a low temperature to take in sufficient oxygen. Now, it becomes possible to introduce a high temperature oxygen-containing gas into the second chamber 10a from the gas introduction hole 8a to perform a full-scale infusibility treatment.

以下本発明の効果を次に示す実施例によって明らかにす
る。The effects of the present invention will be clarified by the following examples.

〔実施例１〕 第１図に示す本発明装置を用いて、充填密度が０．０１
ｆ／ｃｍ”で層高３備のピッチ繊維層を処理した。酸化
性ガスとして２７０℃の熱風をチャンバ１０ａに導入し
、２００℃まで下がったその一部を開口１２を通じてチ
ャンバｌＯｂに供給した。低温チャンバ１０ｂにおける
繊維層１３の滞留時間は１．５時間、高温チャンバ１０
ａ　Ｋおけるそれは２．５時間となるように各チャンバ
の長さ及びコンベア２の走行速度は調整された。[Example 1] Using the apparatus of the present invention shown in FIG. 1, the packing density was 0.01.
A pitch fiber layer with a layer height of 3 was processed at a temperature of 3.3 f/cm. Hot air at 270° C. was introduced into the chamber 10a as an oxidizing gas, and a portion of the air, whose temperature had dropped to 200° C., was supplied to the chamber lOb through the opening 12. The residence time of the fiber layer 13 in the low temperature chamber 10b is 1.5 hours, and the residence time of the fiber layer 13 in the high temperature chamber 10b is 1.5 hours.
The length of each chamber and the running speed of the conveyor 2 were adjusted so that the heating time at K was 2.5 hours.

得られた不融化繊維には溶着は皆無であシ、又サンプル
を繊維層１３の表面、中心部、及び裏面の夫々から採取
し夫々の酸素含有量を測定した結果、１２．５％、　１
２．１％、１２．３％　と極めて均一な結果を示した。There was no welding in the obtained infusible fibers, and samples were taken from the surface, center, and back of the fiber layer 13, and the oxygen content of each was measured, and the results showed that the oxygen content was 12.5%.
The results showed extremely uniform values of 2.1% and 12.3%.

又これらの各サンプルを９００℃の温度下で２時間の水
蒸気処理によつて賦活したがその比表面積は夫ｋ　９５
０ｍ”／ｌ　＋　９１０ｍ”／ｌ　、　９３５ｍ”／ｆ
と均一な値を示した。Furthermore, each of these samples was activated by steam treatment at a temperature of 900°C for 2 hours, and the specific surface area was 95
0m”/l + 910m”/l, 935m”/f
and showed uniform values.

〔比較例１〕 実施例１と同じ繊維層に対して、酸化性ガスを強制貫通
させる代シに表層部に沿って流動させる従来型の装置を
用いて、同じ条件下で不融化処理を行なった。[Comparative Example 1] The same fiber layer as in Example 1 was subjected to infusibility treatment under the same conditions using a conventional device that forced the oxidizing gas to flow along the surface layer instead of forcing it through. Ta.

得られた不融化繊維中に溶着したものがかなυ存在し、
又サンプルを繊維層の表面、中心部、裏面の夫々から採
取して酸素含有量を測定した結果は１２５％、５．１％
、３．２％と非常に差があシ、更にこれを実施例の場合
と同様に賦活した結果においてもその比表面積は夫々９
４０ｍ”／ｆ、７８０ｍ″／ｙ。There is some welded material in the obtained infusible fiber,
In addition, samples were taken from the surface, center, and back of the fiber layer and the oxygen content was measured, and the results were 125% and 5.1%.
, 3.2%, which is a very large difference, and even when activated in the same way as in the example, the specific surface area was 9.
40m"/f, 780m"/y.

６５０ｍ”／Ｐと変動していた。It fluctuated at 650m”/P.

〔実施例２〕 第１図に示す装置を用いて、実施例１と同じ繊維層に対
し、て処理を行なった。この場合の酸化性ガスとしては
３，０００ｐＩ）ｍのオゾンを含む１１０℃の空気をガ
ス導入孔８からチャンバｌｏａ内に供給し、これが７０
℃にまで冷却場れてチャンバ１０ｂ内に供給されるよう
になした。低温チャンバ１０ｂ内での繊維層の滞留時間
は３０分、高温チャンバ１０ａ内では１．５時間になる
ようにコンベアの速度は調整された。[Example 2] Using the apparatus shown in FIG. 1, the same fibrous layer as in Example 1 was treated. In this case, as the oxidizing gas, air at 110°C containing 3,000 pI)m of ozone is supplied from the gas introduction hole 8 into the chamber loa, and this
℃ and then supplied into the chamber 10b. The speed of the conveyor was adjusted so that the residence time of the fiber layer in the low temperature chamber 10b was 30 minutes and in the high temperature chamber 10a 1.5 hours.

得られた不融化繊維には溶着は皆無であシ、又繊維層の
表面、中心部、裏面の各部から採取されたサンプルの酸
素含有率は夫々５．２％、５．５％。There was no welding in the obtained infusible fibers, and the oxygen contents of samples taken from the front, center, and back surfaces of the fiber layer were 5.2% and 5.5%, respectively.

５．０％と均一な値を示した。It showed a uniform value of 5.0%.

〔実施例３〕 第３図に示す本発明装置を用いて第１実施例と同じ繊維
層に対して処理を行々つた。この場合の酸化性ガスとし
ては３．０００ｐｐｍのオゾンを含む７０℃の空気をガ
ス導入孔８ｂからチャンバ１０ｂ内に、一方２７０℃の
熱風をガス導入孔８ａからチャンバ１０ｂ内に供給した
。[Example 3] Using the apparatus of the present invention shown in FIG. 3, the same fiber layer as in the first example was treated. As the oxidizing gas in this case, 70°C air containing 3.000 ppm ozone was supplied into the chamber 10b from the gas introduction hole 8b, while hot air at 270°C was supplied into the chamber 10b from the gas introduction hole 8a.

このような二段処理によって得られた不融化繊維には溶
着は皆無であわ、又繊維層の表面、中心部、裏面の各部
から採取されたサンプルの酸素含有率は夫々１２．０％
、　１２．２％、　１２．５％と略々均一な値を示した
。There was no welding in the infusible fibers obtained by such two-stage treatment, and the oxygen content of samples collected from the surface, center, and back of the fiber layer was 12.0%.
, 12.2%, and 12.5%, which were almost uniform values.

なお以上説明した各実施例においてはいずれも酸化性ガ
スを繊維層の上方から下方へ透過させて処理する場合に
ついてのみ記載されているが、装置をガスが繊維層を下
方から上方へ通過するように構成することも勿論可能で
おる。In addition, in each of the embodiments described above, only the case where the oxidizing gas is passed through the fiber layer from above to the bottom for treatment is described, but the apparatus is designed so that the gas passes through the fiber layer from the bottom to the top. Of course, it is also possible to configure it as follows.

発明の効果 本発明の効果は次の通シである。酸化処理によってピッ
チ繊維の内部に取シ込まれた酸素は、繊維を構成する炭
素と結合状態にあシ、不活性ガス雰囲気でも６００℃以
上の温度であれば、Ｃ０１ＣＯ１の形でガス化されて繊
維から脱出し、後に微細孔を生成するので繊維は数百ｍ
ｌ！、／りの比表面積を有するようになる。これが賦活
化と称されるものである。本発明によれは酸素含有率が
従来の処理によるものよシも多くなるため、この賦活化
の際に生ずる微創孔も多く、又各繊維の酸素自存率も均
一となるため比表面積のバラツキも小さくできる。Effects of the invention The effects of the invention are as follows. Oxygen taken into the pitch fibers through oxidation treatment is bonded to the carbon that makes up the fibers, and even in an inert gas atmosphere, if the temperature is 600°C or higher, it is gasified in the form of CO1CO1. It escapes from the fibers and later generates micropores, so the fibers are several hundred meters long.
l! , /ri. This is called activation. According to the present invention, the oxygen content is higher than that obtained by conventional treatment, so there are many micropores that are generated during this activation, and the oxygen survival rate of each fiber is also uniform, so the specific surface area is Variations can also be reduced.

またガス流が常にａｍ層内部を貫通するので発熱反応に
よって層内部に蓄積される熱も速やかに取去られ、従来
技術において問題となっていた局部的な昇温によるピッ
チ繊維の溶着も防止される。In addition, since the gas flow always penetrates the inside of the AM layer, the heat accumulated inside the layer due to exothermic reactions is quickly removed, and welding of pitch fibers due to localized temperature rise, which was a problem in the conventional technology, is also prevented. Ru.

更に常に新鮮な酸化性ガスが内層の繊維にも供給される
ので全体としての処理時間を短縮することができる。Furthermore, since fresh oxidizing gas is constantly supplied to the fibers in the inner layer, the overall processing time can be shortened.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明にか＼る装置の一実施例の概略を示す側
断面図、第２図は同じくネットコンベア部分の正面断面
図、及び第３図は本発明にかかる装置の別の実施例の概
略を示す慟断面図である。 １・・・処理炉、　２・・・ネットコンベア、３・・・
入　口、　４・・・出　口、 ３ａ、４ａ・・・ローラ、　５・・・スチールベルト、
６・・・シール兼用ガイド、Ａ・・・上部空間、Ｂ・・
・下部空間、　７・・・ネット部分、８・・・ガス導人
孔、 ９ｍ、９ｂ・・・ガス排出孔、１０ａ、１０ｂ・・・チ
ャンバ、１１・・・隔壁、１２・・・開　口、 １３・・・繊維層。 第１図FIG. 1 is a side sectional view schematically showing an embodiment of the apparatus according to the present invention, FIG. 2 is a front sectional view of the net conveyor portion, and FIG. 3 is another embodiment of the apparatus according to the present invention. FIG. 2 is a cross-sectional view of the vagina schematically showing an example. 1... Processing furnace, 2... Net conveyor, 3...
Inlet, 4... Outlet, 3a, 4a... Roller, 5... Steel belt,
6...Guide that also serves as a seal, A...Upper space, B...
・Lower space, 7... Net part, 8... Gas guide hole, 9m, 9b... Gas discharge hole, 10a, 10b... Chamber, 11... Partition wall, 12... Opening , 13... fiber layer. Figure 1

Claims (1)

【特許請求の範囲】 １、　ナフサピッチ、コールタールピッチ等を原料とす
る、溶融紡糸によって得られたピッチ系炭素繊維の不融
化処理方法であって、被処理繊維層を連続的に処理炉内
を進行せしめつつ、酸化性ガスを該繊維層の厚さ方向に
強制的に貫通せしめることを特徴とするピッチ系炭素繊
維の不融化処理方法。 ２、前記不融化処理が低温のガスによって実施される前
処理と、高温のガスによって実施される後処理の二段階
に区分されていることを特徴とする特許請求の範囲第１
項に記載された方法。 ３、前記前処理がオゾンを含有するガスによって、又後
処理が酸素を含有するガスによって実施されることを特
徴とする特許請求の範囲第２項に記載された方法。 ４、入口から出口へ向りて走行するネットコンベアを具
え、且つ該入口、出口及び側面部が実質的に気密にシー
ルされている処理炉を具えたピッチ系炭素繊維の不融化
のだめの連続処理装置であって、前記処理炉には前記ネ
ットコンベアに関して互いに反対側の壁面に酸化性ガス
の導入孔と排出孔が設けられていることを特徴とするピ
ッチ系炭素繊維の不融化処理装置。 ５、前記処理炉が隔壁によって前処理室と、後処理室の
二つに区分されていることを特徴とする特許請求の範囲
第４項に記載された装置。 ６、前記隔壁が開口部を有しておυ、これによって前記
後処理室から前処理室に向うガス流が生ずることを特徴
とする特許請求の範囲第５項に記載された装置。[Claims] 1. A method for infusibility treatment of pitch-based carbon fiber obtained by melt spinning using naphtha pitch, coal tar pitch, etc. as a raw material, which comprises continuously passing a fiber layer to be treated in a treatment furnace. 1. A method for infusibility treatment of pitch-based carbon fibers, which comprises forcing an oxidizing gas to pass through the fiber layer in the thickness direction thereof. 2. Claim 1, characterized in that the infusibility treatment is divided into two stages: a pre-treatment carried out with a low-temperature gas and a post-treatment carried out with a high-temperature gas.
The method described in Section. 3. The method according to claim 2, characterized in that the pre-treatment is carried out with a gas containing ozone, and the post-treatment is carried out with a gas containing oxygen. 4. Continuous treatment of pitch-based carbon fiber infusible pots, comprising a treatment furnace equipped with a net conveyor running from the inlet to the outlet, and in which the inlet, outlet and side portions are substantially hermetically sealed. 1. A pitch-based carbon fiber infusibility treatment apparatus, wherein the treatment furnace is provided with an oxidizing gas introduction hole and an oxidizing gas discharge hole on opposite wall surfaces with respect to the net conveyor. 5. The apparatus according to claim 4, wherein the processing furnace is divided into a pre-processing chamber and a post-processing chamber by a partition wall. 6. The apparatus according to claim 5, wherein the partition wall has an opening, thereby creating a gas flow from the post-treatment chamber to the pre-treatment chamber.