JPH034832B2 - - Google Patents
Info
- Publication number
- JPH034832B2 JPH034832B2 JP7335286A JP7335286A JPH034832B2 JP H034832 B2 JPH034832 B2 JP H034832B2 JP 7335286 A JP7335286 A JP 7335286A JP 7335286 A JP7335286 A JP 7335286A JP H034832 B2 JPH034832 B2 JP H034832B2
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- treatment chamber
- hot air
- furnace
- yarn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Treatment Of Fiber Materials (AREA)
- Tunnel Furnaces (AREA)
- Inorganic Fibers (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高性能炭素繊維を高速生産性下に製造
するのに適した熱処理炉、とくに耐炎化熱処理炉
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat treatment furnace suitable for producing high-performance carbon fibers at high speed productivity, and particularly to a flame-retardant heat treatment furnace.
炭素繊維、とくにアクリロニトリル系合成繊維
を原料として作られた炭素繊維は、その引張強度
が500Kg／mm2以上、伸度２％以上と極めて高性能
なものとすることができるため、航空、宇宙用素
材としての用途開発が進められている。
Carbon fibers, especially carbon fibers made from acrylonitrile synthetic fibers, have extremely high tensile strength of 500 kg/mm 2 or more and elongation of 2% or more, making them suitable for aerospace and aerospace applications. Development of applications as a material is progressing.
アクリロニトリル系合成繊維を出発原料として
炭素繊維を製造するには、まず該繊維を200〜350
℃の酸化性雰囲気下で耐炎化処理することが必要
であるが、この耐炎化反応工程は発熱反応である
ため、一挙に大量の糸条を耐炎化処理すると、耐
炎化反応の暴走が起こり、着火現象が認められる
に至るため、これまでは、できるだけ糸間隔を設
けた小規模焼成法により作らざるを得ず、その製
造コストの低減は極めて困難なものとなつてお
り、従来より、この困難を解決するための方法が
提案されてきた。 To produce carbon fiber using acrylonitrile synthetic fiber as a starting material, first the fiber is
It is necessary to carry out flameproofing treatment in an oxidizing atmosphere at ℃, but since this flameproofing reaction process is an exothermic reaction, if a large amount of yarn is flameproofed at once, the flameproofing reaction will run out of control. Since the ignition phenomenon has been observed, up until now, it has been necessary to use a small-scale firing method in which the threads are spaced as much as possible, making it extremely difficult to reduce manufacturing costs. Methods have been proposed to solve this problem.
例えば特公昭52−21090号公報に示される方法、
或いは特開昭55−1322号公報及び特開昭55−
71818号公報に示される方法があり、後者には熱
処理炉内に複数本上下に並べられた広巾ローラ群
の間に、アクリロニトリル系繊維束をかけ渡し、
これらローラ群を定速で熱処理炉入口より出口に
向けて移動せしめながら熱風を炉の天井部より吹
出し床部で吸気する、いわゆるホツトフル−型熱
処理炉を用いた堅型耐炎化処理炉が示されてい
る。 For example, the method shown in Japanese Patent Publication No. 52-21090,
Or JP-A-55-1322 and JP-A-55-
There is a method shown in Publication No. 71818, and the latter involves passing an acrylonitrile fiber bundle between a group of wide rollers arranged vertically in a heat treatment furnace.
A vertical flame-retardant treatment furnace using a so-called hot full type heat treatment furnace is shown, in which a group of rollers is moved at a constant speed from the inlet to the outlet of the heat treatment furnace, and hot air is blown out from the ceiling of the furnace and sucked in at the floor. ing.
これらの方法によると、連続して大量のアクリ
ロニトリル系繊維束を耐炎化処理することが可能
であるが、これら堅型炉の最大の難点は、炉内で
極部的な上昇気流が生じ、均一な温度分布を有す
る熱処理炉とすることができない点にあり、この
方法によつて得た部分的に不均一熱処理を受けた
耐炎化糸は、その炭素化処理法を工夫しても引張
強度500Kg／mm2以上の高強度炭素繊維或いは弾性
率27〜33t／mm2、引張強度500Kg／mm2以上の高強度
中弾性炭素繊維を効率よく作ることは極めて難し
い現状にある。
According to these methods, it is possible to continuously flame-retardize a large amount of acrylonitrile fiber bundles, but the biggest drawback of these vertical furnaces is that local updrafts occur within the furnace, making it difficult to maintain uniformity. However, it is not possible to use a heat treatment furnace with a uniform temperature distribution, and the flame-retardant yarn obtained by this method and partially subjected to non-uniform heat treatment has a tensile strength of 500 kg even if the carbonization treatment method is devised. The present situation is that it is extremely difficult to efficiently produce high-strength carbon fibers with an elastic modulus of 27 to 33 t/mm 2 and a tensile strength of 500 Kg/mm 2 or higher.
一方、特公昭52−21604号公報に示される如き
横型熱処理炉は、熱風の風向きを上下方向或いは
左右方向に変更して熱処理を行つてもやはり炉内
での対流現象を極めて小さくすることはできず、
均一な熱処理を行うことはできない。更に、この
横型炉ではシート状に並列した多数本のアクリロ
ニトリル系合成繊維を焼成しようとする際には熱
風の供給方法が極めて難しいという難点をも有し
ている。 On the other hand, in the horizontal heat treatment furnace as shown in Japanese Patent Publication No. 52-21604, even if heat treatment is performed by changing the direction of the hot air to vertical or horizontal directions, the convection phenomenon inside the furnace cannot be minimized. figure,
Uniform heat treatment cannot be performed. Furthermore, this horizontal furnace has the disadvantage that it is extremely difficult to supply hot air when attempting to sinter a large number of acrylonitrile synthetic fibers arranged in a sheet-like manner.
そこで本発明者らは、熱風吹き出し口と吸気口
を糸条の通路の上下に備えた構造とするととも
に、この熱処理室の前後に糸条通過口がスリツト
状構造のシール室を設けることによつて、従来法
に比べ、極めて均一な温度制御性を備えた熱処理
炉となし得ることを見出し本発明を完成した。
Therefore, the present inventors created a structure in which a hot air outlet and an inlet are provided above and below the yarn passage, and also provided a seal chamber with a slit-shaped yarn passage opening before and after this heat treatment chamber. Therefore, the present invention was completed by discovering that a heat treatment furnace with extremely uniform temperature control compared to conventional methods can be achieved.
本発明の要旨とするところは、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す熱風
吹き出し口１と該熱風を熱処理室外に排出する為
の吸気口２とを糸条の通路の上下に備え、かつ、
糸条の通路間を区画するように熱処理室内に仕切
板３を設けた熱処理室と、該熱処理室の出入口部
にスリツト６を有するシール室４，５を設けたこ
とを特徴とする炭素繊維製造用横型熱処理炉にあ
る。 The gist of the present invention is that a hot air outlet 1 for blowing hot air into a heat treatment chamber in a direction parallel to the direction of yarn transfer and an air intake port 2 for discharging the hot air to the outside of the heat treatment chamber are connected to the yarn passage. Provided for the top and bottom, and
Carbon fiber production characterized in that a heat treatment chamber is provided with a partition plate 3 in the heat treatment chamber to partition the passages of yarn, and seal chambers 4 and 5 having slits 6 at the entrance and exit of the heat treatment chamber are provided. It is located in a horizontal heat treatment furnace.
以下図面により本発明を説明する。 The present invention will be explained below with reference to the drawings.
第１図は糸条Ａの移送方向と平行な方向へ熱風
を吹き出す熱風吹き出し口１ａ，１ｂ，１ｃ…
と、該熱風を熱処理室外に排出する為の吸気口２
ａ，２ｂ，２ｃ…とを糸条の通路の上下に備え、
かつ、糸条の通路を区画するように熱処理室内に
仕切板３ａ，３ｂ…を設けるとともに、熱処理室
の出入口にスリツトを有するシール室４及び５を
設けた本発明の炭素繊維製造用横型熱処理炉を示
す。 Figure 1 shows hot air outlets 1a, 1b, 1c, etc. that blow out hot air in a direction parallel to the direction in which yarn A is transported.
and an intake port 2 for discharging the hot air to the outside of the heat treatment room.
a, 2b, 2c... are provided above and below the thread passage,
In addition, the horizontal heat treatment furnace for producing carbon fibers of the present invention is provided with partition plates 3a, 3b, . shows.
第２図に示すように熱風吹き出し口１ａ，１
ｂ，１ｃ…より熱処理室に供給される熱風は、通
常、熱処理室外に設けた熱風加熱器１１とフアン
１２を、吸気口２ａ，２ｂ，２ｃ…と熱風吹き出
し口１ａ，１ｂ，１ｃ…とダクトにより接続して
循環使用される。シール室４及び５の前後には糸
条が通過できるようにスリツト６ａ，６ｂ，６ｃ
…が設けられている。このスリツトの開口寸法は
糸条と接触しない範囲で可能な限り狭い方が好ま
しく、この点から上下方向に調節可能なスリツト
とするのが好ましい。 As shown in Figure 2, hot air outlets 1a, 1
The hot air supplied to the heat treatment chamber from b, 1c... is normally passed through a hot air heater 11 and fan 12 provided outside the heat treatment chamber, through intake ports 2a, 2b, 2c..., hot air outlets 1a, 1b, 1c... and ducts. Connected and used in circulation. Slits 6a, 6b, 6c are provided before and after the seal chambers 4 and 5 so that the yarn can pass through.
...is provided. The opening size of this slit is preferably as narrow as possible without coming into contact with the yarn, and from this point it is preferable that the slit be adjustable in the vertical direction.
さらにシール室４及び５には夫々排気口７及び
８が設けられており、炉外に設置したフアン９及
び１０により強制的に排気出来る構造となつてい
る。 Further, the seal chambers 4 and 5 are provided with exhaust ports 7 and 8, respectively, and are configured to be forcibly evacuated by fans 9 and 10 installed outside the furnace.
熱風吹き出し口１ａ，１ｂ，１ｃ…及び吸気口
２ａ，２ｂ，２ｃ…を本発明の構造とすることに
より、炉内における熱風の流れを容易に糸条走行
方向と実質的に平行な流れとすることができ、シ
ート状に並列した多数の糸条を耐炎化処理しても
激しい糸条間摩擦を防げるため、この工程におけ
る擦過による糸条の毛羽立ちや糸切れ現象がほと
んど起こらないものとすることができる。また、
仕切板を設けることにより仕切板で区画される熱
処理室内の空間，，…の雰囲気の熱対流を
従来開発されたきた炉に比べ著しく低いものとす
ることができるので、偏流のないより均一な流れ
となし得るだけでなく、炉内の上下方向の温度の
不均一性をも低減できる。 By making the hot air outlets 1a, 1b, 1c... and the intake ports 2a, 2b, 2c... into the structure of the present invention, the flow of hot air in the furnace can be easily made to flow substantially parallel to the yarn running direction. Even if a large number of yarns lined up in a sheet form are flame-retardantly treated, severe friction between the yarns can be prevented, so the phenomenon of thread fuzzing and yarn breakage due to friction in this process should hardly occur. Can be done. Also,
By providing a partition plate, the heat convection in the atmosphere of the heat treatment chamber divided by the partition plate can be significantly lowered compared to conventionally developed furnaces, resulting in a more uniform flow without uneven flow. Not only can this be achieved, but also the non-uniformity of temperature in the vertical direction within the furnace can be reduced.
一般に、熱処理室内の圧力と炉外の圧力との圧
力差は、気体温度の違いにより生ずる熱処理室内
外の浮力差の影響で炉の高さ方向に変化する。そ
のため、熱処理室の上部スリツトからは熱風が炉
外に逃げやすく、又、下部スリツトからは外部気
体が熱処理室内へ流入し易いが本発明の熱処理炉
は前述した如きシール室４及び５を備えているた
め、シール室内の圧力を熱処理室内の圧力より小
さくすることができるので熱処理室内の圧力変動
に伴う熱処理室内への外部気体の流入による熱処
理室の温度変化を極めて少なくすることができる
のである。 Generally, the pressure difference between the pressure inside the heat treatment chamber and the pressure outside the furnace changes in the height direction of the furnace due to the difference in buoyancy between the outside and outside of the heat treatment chamber caused by the difference in gas temperature. Therefore, hot air easily escapes from the upper slit of the heat treatment chamber to the outside of the furnace, and external gas easily flows into the heat treatment chamber from the lower slit. However, the heat treatment furnace of the present invention is equipped with the seal chambers 4 and 5 as described above. Therefore, the pressure inside the sealing chamber can be made lower than the pressure inside the heat treatment chamber, so it is possible to extremely minimize temperature changes in the heat treatment chamber due to external gas flowing into the heat treatment chamber due to pressure fluctuations inside the heat treatment chamber.
本発明の熱処理炉は前述したごとき構造を有す
るため、熱処理室を所定の温度に加熱した際の温
度コントロール性に極めて優れていると共に、風
向きが糸条の走行方向と平行に保たれている走行
糸条に無理な力が加えられることを防止すること
ができ、シート状に編成した糸条を熱処理した際
にも糸条間の異常な摩擦による毛羽や糸切れの発
生を防ぎ得るものであり、特に炭素繊維製造工程
において採用する耐炎化炉として用いた場合、そ
の性能を高く発揮することができるものである。
Since the heat treatment furnace of the present invention has the above-described structure, it has excellent temperature controllability when heating the heat treatment chamber to a predetermined temperature, and also has a running direction in which the wind direction is kept parallel to the running direction of the yarn. It can prevent excessive force from being applied to the yarn, and even when yarn knitted into a sheet is heat-treated, it can prevent fuzz and yarn breakage due to abnormal friction between the yarns. In particular, when used as a flameproofing furnace employed in a carbon fiber manufacturing process, it can exhibit high performance.
第１図は本発明による炭素繊維製造用横型熱処
理炉の概略構造を示す立断面図、第２図は第１図
を上から見た平面断面図である。
１ａ，１ｂ，１ｃ……熱風吹き出し口、２ａ，
２ｂ，２ｃ……吸気口、３ａ，３ｂ……仕切板、
４，５……シール室、６ａ，６ｂ，６ｃ……スリ
ツト、７……排気口、８……排気口、９，１０…
…排気フアン、１１……熱風加熱器、１２……フ
アン、Ａ……糸条。
FIG. 1 is an elevational sectional view showing a schematic structure of a horizontal heat treatment furnace for producing carbon fibers according to the present invention, and FIG. 2 is a plan sectional view of FIG. 1 viewed from above. 1a, 1b, 1c...Hot air outlet, 2a,
2b, 2c...Intake port, 3a, 3b...Partition plate,
4, 5... Seal chamber, 6a, 6b, 6c... Slit, 7... Exhaust port, 8... Exhaust port, 9, 10...
...exhaust fan, 11...hot air heater, 12...fan, A...yarn.
Claims (1)
熱風を吹き出す熱風吹き出し口１と該熱風を熱処
理室外に排出する為の吸気口２とを糸条の通路の
上下に備え、かつ、糸条の通路間を区画するよう
に熱処理室内に仕切板３を設けた熱処理室と、該
熱処理室の出入口部にスリツト６を有するシール
室４，５を設けたことを特徴とする炭素繊維製造
用横型熱処理炉。1. A hot air outlet 1 for blowing hot air into the heat treatment chamber in a direction parallel to the direction in which the yarn is transferred, and an air inlet 2 for discharging the hot air to the outside of the heat treatment chamber are provided above and below the yarn path, and A horizontal type for manufacturing carbon fiber, characterized in that a heat treatment chamber is provided with a partition plate 3 in the heat treatment chamber to partition the passages, and seal chambers 4 and 5 having slits 6 at the entrance and exit of the heat treatment chamber are provided. Heat treatment furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7335286A JPS62228865A (en) | 1986-03-31 | 1986-03-31 | Horizontal heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7335286A JPS62228865A (en) | 1986-03-31 | 1986-03-31 | Horizontal heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62228865A JPS62228865A (en) | 1987-10-07 |
| JPH034832B2 true JPH034832B2 (en) | 1991-01-24 |
Family
ID=13515685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7335286A Granted JPS62228865A (en) | 1986-03-31 | 1986-03-31 | Horizontal heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62228865A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014007169A1 (en) * | 2012-07-02 | 2014-01-09 | 三菱レイヨン株式会社 | Method for producing carbon fiber bundle and heating furnace for carbon fiber precursor fiber bundle |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001055635A (en) * | 1999-08-12 | 2001-02-27 | Mitsubishi Rayon Co Ltd | Heat treatment furnace for producing carbon fiber and method for producing carbon fiber |
| JP4493775B2 (en) * | 2000-01-06 | 2010-06-30 | 三菱レイヨン株式会社 | Horizontal heat treatment apparatus for yarn and method for producing carbon fiber |
| JP5022014B2 (en) * | 2006-12-13 | 2012-09-12 | 三菱レイヨン株式会社 | Heat treatment method for carbon fiber precursor |
| JP4818964B2 (en) * | 2007-03-19 | 2011-11-16 | 三菱レイヨン株式会社 | Flame resistant furnace |
| JP5207796B2 (en) * | 2008-03-28 | 2013-06-12 | 三菱レイヨン株式会社 | Flame resistant treatment apparatus and precursor fiber bundle flame resistant treatment method |
| JP4494511B2 (en) * | 2009-08-12 | 2010-06-30 | 三菱レイヨン株式会社 | Horizontal heat treatment apparatus for yarn and method for producing carbon fiber |
| CN105074065B (en) | 2013-03-27 | 2018-03-23 | 三菱化学株式会社 | Manufacturing method of carbon fiber |
| JP6372095B2 (en) * | 2014-03-06 | 2018-08-15 | 三菱ケミカル株式会社 | Carbon fiber manufacturing method |
-
1986
- 1986-03-31 JP JP7335286A patent/JPS62228865A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014007169A1 (en) * | 2012-07-02 | 2014-01-09 | 三菱レイヨン株式会社 | Method for producing carbon fiber bundle and heating furnace for carbon fiber precursor fiber bundle |
| CN104428456A (en) * | 2012-07-02 | 2015-03-18 | 三菱丽阳株式会社 | Method for producing carbon fiber bundle and heating furnace for carbon fiber precursor fiber bundle |
| TWI507579B (en) * | 2012-07-02 | 2015-11-11 | Mitsubishi Rayon Co | Method for manufacturing carbon fiber bundle and heating furnace for carbon fiber precursor fiber bundle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62228865A (en) | 1987-10-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |