JPS5932173B2 - Autoclave steam recovery equipment - Google Patents
Autoclave steam recovery equipmentInfo
- Publication number
- JPS5932173B2 JPS5932173B2 JP11681681A JP11681681A JPS5932173B2 JP S5932173 B2 JPS5932173 B2 JP S5932173B2 JP 11681681 A JP11681681 A JP 11681681A JP 11681681 A JP11681681 A JP 11681681A JP S5932173 B2 JPS5932173 B2 JP S5932173B2
- Authority
- JP
- Japan
- Prior art keywords
- steam
- pressure
- autoclave
- boiler
- pipeline
- 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
- 238000011084 recovery Methods 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】
本発明はゴムの加硫やコンクリート製品の蒸気養生等に
使用されるオートクレーブの蒸気の回収装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recovering steam from an autoclave used for vulcanizing rubber, steam curing concrete products, and the like.
オートクレーブの運転はイ製品の挿入、口空気放出、ハ
予熱昇温、二加圧保持、水蒸気放出、へ製品取出の６エ
程を順次サイクルし、口空気放出、ハ予熱昇温、二加圧
保持の各工程で多量の蒸気を使用する。The autoclave is operated by sequentially cycling through 6 steps: (a) Inserting the product, releasing air at the mouth, (c) Preheating and increasing the temperature, (2) Holding pressure, releasing water vapor, and removing the product. Each holding step uses large amounts of steam.
従来上記の工程における水蒸気放出はオートクレーブ内
にある高圧蒸気を大気中に放出していたのである。Conventionally, the steam release in the above process involved releasing high-pressure steam inside the autoclave into the atmosphere.
しかしながらオートクレーブの容積は例えば１５０ｍ程
度ある場合、製品の容積を除いても蒸気容量は１００ｍ
’程度あるため、仮りに１０ｋｇ／ｃｒＡＧで運転され
ている場合にはその放出蒸気の保有熱量は約３７ ｘ
１０’Ｋｃａｌ ／ ｈｒになり、重油に換算すると約
４０．Ｊが大気中に放出されることになる。However, if the volume of an autoclave is, for example, about 150 m, the steam capacity is 100 m even excluding the volume of the product.
If it is operated at 10 kg/crAG, the heat capacity of the released steam is approximately 37 x
10'Kcal/hr, which is approximately 40.0Kcal/hr when converted to heavy oil. J will be released into the atmosphere.
そのため近時七メント製品の蒸気養生の場合にはオート
クレーブよりの放出蒸気の高圧から低圧に至る迄のすべ
ての蒸気を次に使用するオートクレーブの空気放出と予
熱昇温のために有効に使用する方法もあるが、未だ完全
ではな（、オートクレーブの排熱の完全な有効利用とな
らず、中圧蒸気の回収が充分できない欠点があった。Therefore, in the case of steam curing of 7-mentioned products, there is a method to effectively use all the steam released from the autoclave, from high pressure to low pressure, for air release and preheating of the autoclave to be used next. However, it is still not perfect (it has the disadvantage that the exhaust heat of the autoclave cannot be used completely effectively and that medium-pressure steam cannot be recovered sufficiently).
本発明は上記に鑑み、放出蒸気の完全回収と有効利用に
より省エネルギー効果を増大せんとするもので、本発明
は（１）加圧蒸気加熱を使用する複数基のオートクレー
ブの系において、ボイラより各オートクレーブへの高圧
、中圧蒸気の２系列のパイプライン及び各オートクレー
ブとボイラ吸水タンクのボイラ供給水加熱用熱交換器と
を連結する低圧蒸気パイプラインを設け、オートクレー
ブ使用後蒸気放出の際に、オートクレーブ内の高圧の蒸
気が所望の一定の中圧に減圧されるまで、中圧蒸気パイ
プラインを経て、製品を挿入して稼動を開始せんとする
オートクレーブの空気放出と予熱昇温用のために供給し
、オートクレーブ内高圧の蒸気が中圧から所望の一定の
低圧に達したときに該低圧蒸気を低圧蒸気のパイプライ
ンに切換え、ボイラ給水予熱用真空ポンプを備えた熱交
換器に連結してボイラ吸水の加熱に使用するようになし
、中圧蒸気ラインの中圧蒸気が不足する場合にはボイラ
より減圧弁を設けた中圧蒸気パイプラインに連結するパ
イプによって、所望の一定の中圧に減圧したボイラより
の蒸気を夫々のオートクレーブに供給し、中圧蒸気が余
剰になった場合は制御弁を設けた中圧蒸気パイプと熱交
換器とを連結するパイプによって中圧蒸気を低圧蒸気に
減圧して熱交換器に供給してボイラ給水の予熱に使用す
るようになしたオートクレーブの蒸気回収装置を提供す
るものである。In view of the above, the present invention aims to increase the energy saving effect through complete recovery and effective use of released steam. Two lines of high-pressure and medium-pressure steam pipelines to the autoclave and a low-pressure steam pipeline connecting each autoclave and a heat exchanger for heating boiler feed water in the boiler water absorption tank are installed, and when releasing steam after using the autoclave, The high-pressure steam inside the autoclave is passed through the medium-pressure steam pipeline until the pressure is reduced to the desired constant medium pressure, and is used for air release and preheating of the autoclave before starting operation after inserting the product. When the high-pressure steam inside the autoclave reaches a desired constant low pressure from medium pressure, the low-pressure steam is switched to a low-pressure steam pipeline and connected to a heat exchanger equipped with a vacuum pump for preheating boiler feed water. It is used to heat water absorbed by the boiler, and when there is insufficient medium pressure steam in the medium pressure steam line, the desired constant medium pressure is maintained by a pipe connected from the boiler to the medium pressure steam pipeline equipped with a pressure reducing valve. Steam from the reduced pressure boiler is supplied to each autoclave, and if there is surplus medium pressure steam, the medium pressure steam is converted to low pressure steam by a pipe connecting the medium pressure steam pipe equipped with a control valve and the heat exchanger. The present invention provides an autoclave steam recovery device that reduces the pressure and supplies it to a heat exchanger for use in preheating boiler feed water.
次に図面によって本発明を説明する。Next, the present invention will be explained with reference to the drawings.
第１図は従来のオートクレーブの使用における装置のフ
ローシートを示すもので、ボイラ１７で発生した蒸気は
高圧蒸気パイプライン９より制御弁４，４’、４“を介
して各オートクレーブ１，１’。FIG. 1 shows a flow sheet of the apparatus in the use of a conventional autoclave. Steam generated in the boiler 17 is passed from the high-pressure steam pipeline 9 to each autoclave 1, 1' via control valves 4, 4', 4". .
１“に供給される。1".
オートクレーブ１内に製品が挿入されると空気抜弁６を
開放の状態で制御弁４を開き、送気して内部空気の放出
を行なう。When a product is inserted into the autoclave 1, the air vent valve 6 is left open and the control valve 4 is opened to supply air and release the internal air.
空気放出完了後は空気抜弁６を閉じ、予熱昇温、加圧保
持の後、制御弁２を開にしてオートクレーブ内蒸気をす
べて放出し製品を取り出して１サイクルを完了する。After the air release is completed, the air release valve 6 is closed, and after preheating, raising the temperature, and maintaining the pressure, the control valve 2 is opened to release all the steam in the autoclave and take out the product, completing one cycle.
従来は空気放出、予熱昇温、加圧保持の工程を高圧蒸気
のみで実施していたが、実際のオートクレーブの操業に
おいては空気放出と予熱昇温工程の途中まではオートク
レーブ内蒸気圧力が低い（１ｋｇ／ｃｒｌｔＧ程度）た
め、２ｋｇ／ｃｒＡＧ程度の中圧蒸気で充分である。Conventionally, the processes of air release, preheating and temperature raising, and pressurization and holding were carried out using only high-pressure steam, but in actual autoclave operation, the steam pressure inside the autoclave is low until the middle of the air release and preheating and temperature raising processes ( (approximately 1 kg/crltG), therefore, medium pressure steam of approximately 2 kg/crAG is sufficient.
本発明はこの点に着目し、省エネルギーの見地から、オ
ートクレーブの加圧保持後、蒸気放出の工程で放出され
る高圧蒸気を例えば２ｋｇ／ｃｒｔｒＧ程度の所望の一
定の中圧になるまでは次に使用を開始する他のオー・ク
レープの空気放出や予熱昇温に供し、然る後さらに２ｋ
ｇ／ｃｒｔｆＧ未満の低圧になったとき、該低圧蒸気を
ボイラの給水予熱に供することによって、オートクレー
ブの排熱の完全回収を計るような装置になしたものであ
る。The present invention focuses on this point, and from the viewpoint of energy saving, the high-pressure steam released in the steam release process after pressurization of the autoclave is maintained until it reaches a desired constant intermediate pressure of, for example, about 2 kg/crtrG. Used for air release and preheating of other au crepes to be used, and then heated for an additional 2k.
This device is designed to completely recover exhaust heat from the autoclave by supplying the low-pressure steam to preheat the feed water of the boiler when the pressure is lower than g/crtfG.
上記は本発明の一実施の態様を示したものであるが本発
明は中圧蒸気圧力が２ｋｙ／ｃｎｉＧより大幅に低下し
た場合も実施可能である。Although the above shows one embodiment of the present invention, the present invention can also be practiced when the intermediate pressure steam pressure is significantly lower than 2ky/cniG.
第２図は本発明のオートクレーブ蒸気回収装置の一実施
例のフローシートを示す。FIG. 2 shows a flow sheet of an embodiment of the autoclave vapor recovery apparatus of the present invention.
第２図においてボイラ１７より発生した蒸気を高圧蒸気
のパイプライン９より制御弁４，４’、４″を介して各
オートクレーブ１ 、１’、 １“に供給し、更に高圧
蒸気パイプライン９より減圧弁７により２ｋｇ／ｃａＧ
程度の中圧にまで減圧された蒸気を中圧蒸気のパイプラ
イン１０に導き、制御弁５ 、５’。In FIG. 2, steam generated from a boiler 17 is supplied from a high-pressure steam pipeline 9 to each autoclave 1, 1', 1" via control valves 4, 4', 4", and then supplied from a high-pressure steam pipeline 9 to each autoclave 1, 1', 1". 2kg/caG by pressure reducing valve 7
The steam whose pressure has been reduced to a medium pressure of about 100 ml is guided to the medium pressure steam pipeline 10 through control valves 5 and 5'.
５“を介してオートクレーブ１．１’、１“に供給する
。5" to the autoclave 1.1', 1".
オートクレーブ１，１’、１“より放出される２’に９
／ｃｒＡＧ以上の蒸気が２ｋｇ／ｃｍＧ程度の中圧にな
・るまでは制御弁２，２’、γを介して中圧蒸気パイプ
ライン１０に供給し、オートクレーブ１，１’。9 to 2' released from autoclave 1, 1', 1"
Steam having a pressure higher than /crAG is supplied to the intermediate pressure steam pipeline 10 via the control valves 2, 2' and γ until the steam reaches an intermediate pressure of about 2 kg/cmG, and then is supplied to the autoclave 1, 1'.
１“より放出される２ ｋｇ ／ｃｒｒｒ Ｇ未満に圧
力の降下した低圧蒸気は制御弁３．３’、３“を介して
低圧蒸気パイプライン１１より熱交換器１２に供給され
、熱交換器１２で給水タンク１４から循環ポンプ１３に
よって供給されたボイラ給水に熱を与え、凝縮復水した
後、真空ポンプ１８によって吸引排出される。The low-pressure steam released from the low-pressure steam pipeline 11 with a pressure drop of less than 2 kg/crrr G is supplied to the heat exchanger 12 from the low-pressure steam pipeline 11 via the control valves 3.3' and 3''. The boiler feed water supplied from the water tank 14 by the circulation pump 13 is given heat, condensed and condensed, and then sucked and discharged by the vacuum pump 18.
吸水タンク１４内の水は給水タンク１４→循環ポンプ１
３→熱交換器１２→給水タンク１４を常時循環して低圧
蒸気パイプライン１１からの蒸気の熱を吸収し、ボイラ
吸水ポンプ１６によってボイラ１７に供給される。The water in the water suction tank 14 is transferred from the water supply tank 14 to the circulation pump 1
3→heat exchanger 12→water supply tank 14 to absorb the heat of steam from the low-pressure steam pipeline 11 and supply it to the boiler 17 by the boiler water suction pump 16.
次に本発明を使用してオートクレーブの蒸気を回収する
方法を以下に説明する。A method for recovering autoclave vapor using the present invention will now be described.
今仮にオートクレーブ１が蒸気放出工程に、オートクレ
ーブ１′が加圧保持工程にオートクレーブ１“が予熱昇
温工程にあるときは次のようになる。If the autoclave 1 is in the steam release process, the autoclave 1' is in the pressure holding process, and the autoclave 1'' is in the preheating temperature raising process, the following will occur.
オートクレーブ１より放出される蒸気は制御弁２を介し
て中圧蒸気ライン１０に入り制御弁５“よりオートクレ
ーブ１“に供給される。Steam discharged from the autoclave 1 enters the medium pressure steam line 10 via the control valve 2 and is supplied to the autoclave 1'' via the control valve 5''.
オートクレーブ１の内圧が所定の圧力、約２ｋｇ／ｃｒ
ｔｔＧまで低下したとき、制御弁２は閉となり制御弁３
が開き、低圧蒸気は低圧蒸気ライン１１を経て熱交換器
１２に供給され、ボイラ給水の予熱に使用される。The internal pressure of autoclave 1 is the specified pressure, approximately 2 kg/cr.
When the temperature drops to ttG, control valve 2 is closed and control valve 3 is closed.
is opened, and low-pressure steam is supplied to the heat exchanger 12 via the low-pressure steam line 11, where it is used to preheat boiler feed water.
一方オートクレープ１“はオートクレーブ１よりの放出
蒸気がなくなっても、減圧弁７を介して中圧パイプライ
ン１０を経て供給されるボイラ１７からの蒸気を受け、
さらに昇温を続げ、オートクレーブ１“内の内圧が所定
の圧力になった時点で制御弁５“が閉となり、制御弁イ
が開き高圧蒸気の供給を受け、加圧保持の工程に入る。On the other hand, even if the steam discharged from the autoclave 1 is exhausted, the autoclave 1'' receives steam from the boiler 17 supplied via the medium pressure pipeline 10 via the pressure reducing valve 7.
The temperature continues to rise further, and when the internal pressure within the autoclave 1'' reaches a predetermined pressure, the control valve 5'' is closed, and the control valve I opens to receive the supply of high-pressure steam and enter the pressurization maintenance process.
またオートクレーブ１′は制御弁４′が開の状態で加圧
保持を続ける。Further, the autoclave 1' continues to be pressurized with the control valve 4' open.
上記の様に複数台並列運転されるオートクレーブの何れ
かが空気放出か又は予熱昇温の工程にあれば、他の何れ
のオートクレーブが蒸気放出の工程に入っても何等問題
なく運転が継続される。As mentioned above, if one of the autoclaves operated in parallel is in the air release or preheating process, the operation will continue without any problems even if any other autoclave is in the steam release process. .
萬−何れかのオートクレーブが蒸気放出の工程に入つて
も他のすべてが空気放出か又は予熱昇温工程以外の工程
にある場合には中圧蒸気パイプライン１０内の蒸気圧力
が上昇するため所定圧力以上になったとぎは制御弁８を
開き、低圧蒸気パイプライン１１′を経て、熱交換器１
２に導かれるようになり、複数台並列のオートクレーブ
の如何なる運転状態にあっても使用蒸気のロスは全熱な
い。- Even if any autoclave enters the steam release process, if all other autoclaves are in air release or in a process other than the preheating temperature raising process, the steam pressure in the medium pressure steam pipeline 10 will rise, so the predetermined When the pressure exceeds the level, the control valve 8 is opened, and the steam is passed through the low-pressure steam pipeline 11' to the heat exchanger 1.
2, there is no heat loss in the steam used, regardless of the operating state of multiple autoclaves in parallel.
本発明のオートクレーブの蒸気回収装置は上記の様に、
複数台のオートクレーブが如何なる運転状態にあっても
、蒸気を一切大気中に放出することなく、完全に回収さ
れるため省エネルギー効果は多大であり、現在のエネル
ギー事情において社会的貢献度が著しく高い。As described above, the autoclave steam recovery device of the present invention has the following features:
Regardless of the operating state of multiple autoclaves, the steam is completely recovered without being released into the atmosphere, so the energy saving effect is significant, and the social contribution is extremely high in the current energy situation.
第１図は従来のオートクレーブの使用における装置のフ
ローシート、第２図は本発明のオートクレーブ蒸気回収
装置の一実施例のフローシートを示す図である。
１．１’、１“−−−−−−、ｔ −トクＬ／−７”、
２，２′、ｚ′。
３．３′、′ｇ′、４，４′、７ｔ／、５，５′、５′
′・・・・・・制御弁、６．６’、６″・・・・・・空
気抜弁、７・・・・・・減圧弁、８・・・・・・制御弁
、９・・・・・・高圧蒸気パイプライン、１０・・・・
・・中圧蒸気パイプライン、１１ 、１１’・・・・・
・低圧蒸気パイプライン、１２・・・・・・熱交換器、
１３・・・・・・循環ポンプ、１４・・・・・・給水タ
ンク、１５・・・・・・補給水管、１６・・・・・・ボ
イラ給水ポンプ、１７・・・・・・ボイラ、１８・・・
・・・真空ポンプ。FIG. 1 is a flow sheet of the apparatus in use of a conventional autoclave, and FIG. 2 is a flow sheet of an embodiment of the autoclave vapor recovery apparatus of the present invention. 1.1', 1"----, t-tokuL/-7",
2, 2', z'. 3.3', 'g', 4,4', 7t/, 5,5', 5'
'... Control valve, 6.6', 6''... Air vent valve, 7... Pressure reducing valve, 8... Control valve, 9... ...High pressure steam pipeline, 10...
...Intermediate pressure steam pipeline, 11, 11'...
・Low pressure steam pipeline, 12... Heat exchanger,
13... Circulation pump, 14... Water supply tank, 15... Supply water pipe, 16... Boiler water supply pump, 17... Boiler, 18...
···Vacuum pump.
Claims (1)
ブの系において、ボイラかもそれぞれの空気抜き用弁６
を備えたオートクレーブ１に分岐して連結する高圧蒸気
供給用高圧蒸気のパイプライン９を備え、該高圧蒸気の
ビイプライン９がそれぞれのオートクレーブ１に連結す
る前方に制御弁４を備え、更にそれぞれのオートクレー
ブ１をバイパスによって連結する中圧１０及び低圧１１
蒸気のパイプラインを備え、それぞれのオートクレーブ
から該中圧１０及び低圧１１蒸気のパイプラインに対し
て設けられた共通の連結管を経て、中圧側１０及び低圧
側１１にそれぞれ制御弁２，３を備えかつ高圧蒸気パイ
プ９と中圧蒸気パイプ１０とを減圧弁７を備えたパイプ
によって連結して必要時にボイラより減圧された蒸気が
それぞれのオートクレーブに供給されるようにし、更に
中圧蒸気を排出並びに供給する中圧側パイプ１０にはバ
イパスによりそれぞれのオートクレーブへの入口側に中
圧用制御弁５を備え、かつ中圧側蒸気パイプライン１０
には制御弁８を経て蒸気パイプライン１１′により、ま
た低圧側蒸気パイプライン１１はそのまま直接、両蒸気
パイプライン１１′、１１は共に合一されて、熱交換器
１２に連結し、低圧側１１及び中圧側１１′より共に低
圧の蒸気がボイラの熱交換器１２に供給されるようにし
、かつボイラの熱交換器１２は一方では低圧蒸気パイプ
ライン１１ 、１１’に連結し、他方では吸引用真空ポ
ンプ１８を備えて、ボイラ給水タンク１４との間にボイ
ラへの給水循環用パイプラインを備え、低圧蒸気パイプ
ライン１１ 、１１’からの蒸気の熱を回収して、ボイ
ラ１７に供給されるようにしてなるオートクレーブの蒸
気回収装置。1 In a system of multiple autoclaves heated by pressurized steam, the air vent valve 6 of each boiler
A high-pressure steam pipeline 9 for supplying high-pressure steam is branched and connected to an autoclave 1 having a 1 connected by a bypass, an intermediate pressure 10 and a low pressure 11
A steam pipeline is provided, and control valves 2 and 3 are connected to the intermediate pressure side 10 and the low pressure side 11, respectively, through a common connecting pipe provided from each autoclave to the intermediate pressure 10 and low pressure 11 steam pipelines. The high pressure steam pipe 9 and the intermediate pressure steam pipe 10 are connected by a pipe equipped with a pressure reducing valve 7 so that steam reduced in pressure from the boiler is supplied to each autoclave when necessary, and the intermediate pressure steam is further discharged. In addition, the medium pressure side pipe 10 for supplying the medium pressure side is equipped with a medium pressure control valve 5 on the inlet side to each autoclave by bypass, and the medium pressure side steam pipeline 10
The steam pipeline 11 on the low pressure side is directly connected to the heat exchanger 12 through the control valve 8, and the low pressure side steam pipeline 11 is directly connected to the heat exchanger 12. 11 and intermediate pressure side 11', and the boiler heat exchanger 12 is connected to the low pressure steam pipelines 11 and 11' on the one hand and the suction side on the other hand. A vacuum pump 18 is provided, and a pipeline for circulating water supply to the boiler is provided between the boiler water supply tank 14 and heat of steam from the low pressure steam pipelines 11 and 11' is recovered and supplied to the boiler 17. An autoclave steam recovery device designed to
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11681681A JPS5932173B2 (en) | 1981-07-25 | 1981-07-25 | Autoclave steam recovery equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11681681A JPS5932173B2 (en) | 1981-07-25 | 1981-07-25 | Autoclave steam recovery equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5817829A JPS5817829A (en) | 1983-02-02 |
| JPS5932173B2 true JPS5932173B2 (en) | 1984-08-07 |
Family
ID=14696347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11681681A Expired JPS5932173B2 (en) | 1981-07-25 | 1981-07-25 | Autoclave steam recovery equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5932173B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2541035A1 (en) * | 2006-03-27 | 2007-09-27 | Brian H. Harrison | Reactor for rubber reduction |
| JP6498401B2 (en) * | 2014-09-05 | 2019-04-10 | 株式会社ブリヂストン | Tire manufacturing method and tire manufacturing facility |
-
1981
- 1981-07-25 JP JP11681681A patent/JPS5932173B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5817829A (en) | 1983-02-02 |
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