JP6306257B1 - Cleaning method for removing contaminated grease from objects to be cleaned with grease - Google Patents
Cleaning method for removing contaminated grease from objects to be cleaned with grease Download PDFInfo
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- JP6306257B1 JP6306257B1 JP2017180210A JP2017180210A JP6306257B1 JP 6306257 B1 JP6306257 B1 JP 6306257B1 JP 2017180210 A JP2017180210 A JP 2017180210A JP 2017180210 A JP2017180210 A JP 2017180210A JP 6306257 B1 JP6306257 B1 JP 6306257B1
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- 239000004519 grease Substances 0.000 title claims abstract description 84
- 238000004140 cleaning Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000009835 boiling Methods 0.000 claims abstract description 6
- 239000002904 solvent Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000011109 contamination Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
- C23G5/028—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing halogenated hydrocarbons
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
【課題】被洗浄物に付着した大量の汚染グリースを、容易且つ確実に除去する。【解決手段】被洗浄物5,25のオーバーホール時に、この被洗浄物5,25に付着した汚染グリースを滴点以上に加熱することにより、被洗浄物5,25から汚染グリースを液化除去する方法であって、この汚染グリースの滴点以上の加熱は、汚染グリースの滴点以上の沸点を有する完全フッ素化液、加熱油、又はグリースを汚染グリースの滴点以上に加熱して加熱液体4,24とし、この加熱液体4,24又は加熱液体4,24から発生する洗浄蒸気26を、汚染グリースが付着した被洗浄物5,25に接触させて行う。【選択図】図１A large amount of contaminated grease adhering to an object to be cleaned is easily and reliably removed. A method of liquefying and removing contaminated grease from objects to be cleaned by heating the contaminated grease adhering to the objects to be cleaned to a drop point or higher when the objects to be cleaned are overhauled. The heating above the dropping point of the contaminating grease is performed by heating the fully fluorinated liquid, heating oil, or grease having a boiling point above the dropping point of the contaminating grease to the heating liquid 4, 24, the cleaning liquid 26 generated from the heated liquids 4 and 24 or the heated liquids 4 and 24 is brought into contact with the objects 5 and 25 to which the contaminated grease is attached. [Selection] Figure 1
Description
本発明は、潤滑などの用途で被洗浄物に使用した汚染グリースを、この被洗浄物から除去するための汚染グリース除去洗浄方法に係るものである。 The present invention relates to a contaminated grease removing and cleaning method for removing contaminated grease used for an object to be cleaned in applications such as lubrication from the object to be cleaned.
車両のボールジョイントやユニバーサルジョイントをはじめとする各種作業機械は、高荷重や衝撃荷重を受ける摩擦面に潤滑用のグリースが大量に塗布されて使用されるものである。また、使用頻度に応じて定期点検をかねたオーバーホールが行われるため、このオーバーホールの際には、作業機械に大量に付着している汚染グリースを除去する作業が必要となる。 Various work machines such as vehicle ball joints and universal joints are used with a large amount of lubricating grease applied to a friction surface that receives a high load or impact load. In addition, since overhaul is also performed in accordance with the frequency of use, it is necessary to remove the contaminated grease adhering to the work machine in large quantities during this overhaul.
そこで上記特許文献１に示す如く、被洗浄物に付着したグリースを除去する洗浄方法について開示されているが、特許文献１では主に精密部品やその組み立てに使用する治具類に付着した油分を除去するためのものであるから、オーバーホール時に作業機械に大量に付着した汚染グリースを十分に除去しきれないものであった。また特許文献１では洗浄溶剤によって被洗浄物に付着した汚染グリースを除去するものであるから、大量のグリースを除去するためには洗浄溶剤や水を大量に使用しなければならず環境に負荷がかかるとともにコストが高くつくものとなっていた。 Therefore, as shown in Patent Document 1 above, a cleaning method for removing grease adhering to an object to be cleaned is disclosed, but in Patent Document 1, oil components adhering mainly to precision parts and jigs used for assembly thereof are disclosed. Since it was for removing, the contaminated grease adhering to the work machine in large quantities during overhaul could not be removed sufficiently. Further, in Patent Document 1, since the contaminated grease adhered to the object to be cleaned is removed by the cleaning solvent, in order to remove a large amount of grease, a large amount of the cleaning solvent and water must be used, and there is a burden on the environment. At the same time, the cost is high.
またオーバーホールの際には、従来より被洗浄物に付着した大量のグリースを布や紙でふき取ったり、水の高圧ジェット噴射によって物理的に除去したりする方法が主流となっていた。そのため作業者に多大な労力がかかるとともに、高圧ジェット噴射の場合は大量の水を必要とするものであるため、いずれの方法もやはりコストや手間、更に時間がかかるものとなっていた。 In the case of overhaul, conventionally, a method of wiping off a large amount of grease adhering to an object to be cleaned with a cloth or paper or physically removing it by high-pressure jet of water has been the mainstream. For this reason, a great deal of labor is required for the operator, and in the case of high-pressure jet injection, a large amount of water is required. Therefore, both methods are costly, labor-intensive, and further time-consuming.
そこで、本願発明は上述の如き課題を解決しようとするものであって、被洗浄物に付着した大量の汚染グリースを、容易且つ確実に除去しようとするものである。 Accordingly, the present invention is intended to solve the above-described problems, and is intended to easily and reliably remove a large amount of contaminated grease adhering to an object to be cleaned.
本願発明は上述の如き課題を解決するため、被洗浄物のオーバーホール時に、この被洗浄物に付着した汚染グリースを滴点以上に加熱することにより、被洗浄物から汚染グリースを液化除去する方法であって、この汚染グリースの滴点以上の加熱は、グリース、又は汚染グリースの滴点以上の沸点を有する加熱油を汚染グリースの滴点以上に加熱して加熱液体とし、この加熱液体を、汚染グリースが付着した被洗浄物に接触させて行うものである。尚、本発明の汚染グリースとは、被洗浄物を使用する際に高負荷、衝撃加重を受ける摩擦面などに塗布された潤滑用のグリースであって、オーバーホール時まで使用された被洗浄物に付着しているものを意味する。 In order to solve the above-described problems, the present invention is a method for liquefying and removing contaminated grease from an object to be cleaned by heating the contaminated grease adhering to the object to be cleaned at a dropping point or more during overhaul of the object to be cleaned. there are, heating above the drop point of the contaminating grease, grease, or heating oil having a boiling point above the drop point of the contaminating grease heated above dropping point of contaminated grease with heated liquid, the heating fluid body, It is performed by contacting the object to be cleaned with contaminated grease. The contaminated grease of the present invention is a grease for lubrication applied to a friction surface that receives a high load and impact load when the object to be cleaned is used. It means what is attached.
また、被洗浄物は、上記汚染グリース除去洗浄において加熱された後、常温水、温水、又は沸騰水のいずれかに接触させて急冷することにより、この急冷とともに生じる水蒸気発生の物理力によって、上記汚染グリースの除去洗浄後に被洗浄物に残存している汚れを除去するものであっても良い。尚、上記の如く被洗浄物に付着した汚染グリースを滴点以上に加熱した場合には多くの被洗浄物が１５０℃以上の高温になることから、上記の如く水を接触させて急冷することにより、被洗浄物を冷却するという目的についても果たすことができる。 In addition, the object to be cleaned is heated in the above-described cleaning for removing contaminated grease, and then brought into contact with normal temperature water, warm water, or boiling water and rapidly cooled. It is also possible to remove dirt remaining on the object to be cleaned after removing the contaminated grease. In addition, when the contaminated grease adhering to the object to be cleaned is heated above the dropping point, many objects to be cleaned reach a high temperature of 150 ° C. or higher. Thus, the object of cooling the object to be cleaned can also be achieved.
また上記の如く、加熱油、又はグリースをグリースの滴点以上に加熱して加熱液体とし、この加熱液体を、汚染グリースが付着した被洗浄物に接触させて被洗浄物からの汚染グリースの除去洗浄を行った後、仕上げ洗浄として、上記被洗浄物に残存している汚染グリースを、洗浄溶剤にて除去洗浄したものであっても良い。尚、上記の如く被洗浄物に付着した汚染グリースを滴点以上に加熱した場合には多くの被洗浄物が１５０℃以上の高温になることから、上記の如く洗浄溶剤にて仕上げ洗浄を行うことにより、被洗浄物を冷却するという目的についても果たすことができる。 Also as mentioned above, the pressurized hot oil or grease and heated to heat the liquid to the above dropping point of the grease contamination grease the heating liquid body, from the object to be cleaned is brought into contact with the object to be cleaned contamination grease adhered After the removal cleaning, the contaminated grease remaining on the object to be cleaned may be removed and cleaned with a cleaning solvent as the final cleaning. In addition, when the contaminated grease adhering to the object to be cleaned is heated above the dropping point, many objects to be cleaned reach a high temperature of 150 ° C. or higher, so the final cleaning is performed with the cleaning solvent as described above. Thus, the object of cooling the object to be cleaned can also be achieved.
本発明は上述の如く構成したものであるから、被洗浄物に付着した汚染グリースを滴点以上に加熱することによって、加熱前は除去洗浄に手間やコストがかかっていた汚染グリースを、被洗浄物から容易に滴下させて除去することが可能となる。また、被洗浄物から汚染グリースを完全に滴下除去する必要がある場合でも、上記の如く汚染グリースを滴点以上に加熱して被洗浄物から除去することにより大半の汚染グリースを除去することができるため、その後に溶剤洗浄などの簡単な仕上げ洗浄を行うことによって、残存している少量の汚染グリースを被洗浄物から完全に除去することが可能となる。そしてこのように仕上げ洗浄を行う場合でも、少量の汚染グリースを除去するのみであるから洗浄溶剤の使用量を少なくすることができるとともに、汚染グリースによる洗浄溶剤への汚染も少ないものとなるため、環境への負荷を低減することができるとともに、洗浄コストを低く抑えることができる。 Since the present invention is configured as described above, by heating the contaminated grease adhering to the object to be cleaned above the dropping point, the contaminated grease that has been troublesome and costly to remove and clean before heating can be cleaned. It can be easily dropped from an object and removed. Even when it is necessary to completely remove and remove contaminating grease from the object to be cleaned, it is possible to remove most of the contaminated grease by heating it above the dropping point and removing it from the object to be cleaned as described above. Therefore, by performing simple finishing cleaning such as solvent cleaning after that, it is possible to completely remove a small amount of remaining contaminated grease from the object to be cleaned. And even when performing finish cleaning in this way, since only a small amount of contaminated grease is removed, the amount of cleaning solvent used can be reduced, and contamination of the cleaning solvent with contaminated grease is also reduced. The load on the environment can be reduced and the cleaning cost can be kept low.
本発明の実施例１を図１に於いて説明すると、図１に示す如く（１）は洗浄槽であって、底部側にはヒーター(2)と温度調節を行うためのセンサー(3)とを配置するとともに、内部にはグリースを収納している。 Embodiment 1 of the present invention will be described with reference to FIG. 1. As shown in FIG. 1, (1) is a cleaning tank, and a heater (2) and a sensor (3) for adjusting temperature are provided on the bottom side. In addition, grease is stored inside .
そしてこのグリースをヒーター(2)にて汚染グリースの滴点以上に加熱して加熱液体(4)とし、この加熱液体(4)に、図１に示す如く汚染グリースが付着した被洗浄物(5)を浸漬する。このように加熱液体(4)に被洗浄物(5)を浸漬することにより、この被洗浄物(5)に付着していた汚染グリースが滴点以上に加熱されて液化する。そして本実施例では被洗浄物(5)を加熱液体(4)に１０分間浸漬した後、被洗浄物(5)を加熱液体(4)から引き上げて汚染グリースを被洗浄物(5)から滴下させることにより、被洗浄物(5)に付着した汚染グリースを除去した。尚、本実施例では上記洗浄を主洗浄とする。 Then, this grease is heated by the heater (2) above the dropping point of the contaminated grease to form a heated liquid (4), and the object to be cleaned (5) with the contaminated grease adhered to the heated liquid (4) as shown in FIG. Soak). By soaking the object to be cleaned (5) in the heated liquid (4) in this way, the contaminated grease adhering to the object to be cleaned (5) is heated above the dropping point and liquefied. In this embodiment, the object to be cleaned (5) is immersed in the heated liquid (4) for 10 minutes, and then the object to be cleaned (5) is pulled up from the heated liquid (4) to drop the contaminated grease from the object to be cleaned (5). As a result, the contaminated grease adhered to the object to be cleaned (5) was removed. In this embodiment, the above cleaning is the main cleaning.
この主洗浄のみで汚染グリースの除去洗浄を終了することも可能であるが、主洗浄のみでは少量ながら汚染グリースが被洗浄物(5)に残存してしまう場合がある。そのため、本実施例では被洗浄物(5)から汚染グリースを完全に除去するために、更に洗浄溶剤による汚染グリースの仕上げ洗浄を行った。この仕上げ洗浄について説明すると、上記洗浄槽(1)とは別の洗浄槽(図示せず。)を用意し、この洗浄槽内に、本実施例の洗浄溶剤としてブチルジグリコールを収納し、この洗浄溶剤内に上記主洗浄後の被洗浄物(5)を５分間浸漬して洗浄を行った。 It is possible to finish the removal and removal of the contaminated grease only by this main cleaning, but the contaminated grease may remain in the object to be cleaned (5) with a small amount only by the main cleaning. For this reason, in this example, in order to completely remove the contaminated grease from the object to be cleaned (5), the contaminated grease was further cleaned with a cleaning solvent. This finishing cleaning will be described. A cleaning tank (not shown) separate from the cleaning tank (1) is prepared, and butyl diglycol is stored as a cleaning solvent in this embodiment in the cleaning tank. The object to be cleaned (5) after the main cleaning was immersed in a cleaning solvent for 5 minutes for cleaning.
ここで、本実施例において主洗浄及び仕上げ洗浄時の被洗浄物(5)からの汚染グリースの除去率を調べたところ、主洗浄時で約96％の汚染グリースが除去され、仕上げ洗浄によって汚染グリースが100％除去される結果となった。この結果から、汚染グリースを滴点以上に加熱して除去する主洗浄により、短時間で大半の汚染グリースを被洗浄物(5)から容易に除去できるとともに、仕上げ洗浄を行うことによって被洗浄物に付着した汚染グリースを確実に除去することができることが確認できた。尚、上記の如く主洗浄を行った場合には被洗浄物(5)が加熱されて１５０℃以上の高温となった。そこで本実施例の如く仕上げ洗浄を行うことにより、被洗浄物(5)を冷却するという目的についても果たすことができた。 Here, the removal rate of contaminated grease from the object to be cleaned (5) at the time of main cleaning and finish cleaning was examined in this example. As a result, about 96% of the contaminated grease was removed at the time of main cleaning. As a result, 100% of the grease was removed. From this result, it is possible to easily remove most of the contaminated grease from the object to be cleaned (5) in a short time by the main cleaning that removes the contaminated grease by heating it above the dropping point, and also by performing the final cleaning. It was confirmed that the contaminated grease adhering to can be removed reliably. When the main cleaning was performed as described above, the article to be cleaned (5) was heated to a high temperature of 150 ° C. or higher. Therefore, the purpose of cooling the object to be cleaned (5) could be fulfilled by performing the final cleaning as in this example.
また上記実施例１では、加熱液体(4)としてグリースを使用しているが、本実施例では加熱液体(4)として加熱油を用いている。即ち図１に示す如く、本実施例でも上記実施例１と同様の洗浄槽(1)を用いるとともに、この洗浄槽(1)内に、汚染グリースの滴点以上の沸点を有する加熱油を収納する。そして、この加熱油をヒーター(2)にて汚染グリースの滴点以上に加熱し、加熱液体(4)とする。そしてこの加熱液体(4)中に汚染グリースが付着した被洗浄物(5)を浸漬する。 In the above embodiment 1, the use of the grease as a heated liquid (4), in this embodiment with a heating oil as a heating fluid (4). That is, as shown in FIG. 1, the cleaning tank (1) similar to that of the first embodiment is used in this embodiment, and heating oil having a boiling point higher than the dropping point of contaminated grease is stored in the cleaning tank (1). To do. Then, this heated oil is heated by the heater (2) to a point above the dropping point of the contaminated grease to obtain a heated liquid (4). Then, the object to be cleaned (5) to which the contaminating grease adheres is immersed in the heated liquid (4).
そして所定の時間浸漬することにより、被洗浄物(5)に付着していた汚染グリースが、加熱液体(4)によってこの汚染グリースの滴点以上に加熱されて液化する。そのため、この状態で被洗浄物(5)を加熱液体(4)から引き上げることにより、この被洗浄物(5)に付着していた汚染グリースが滴下して被洗浄物(5)から除去されるものとなる。 Then, by immersing for a predetermined time, the contaminated grease adhering to the object to be cleaned (5) is heated and liquefied by the heated liquid (4) above the dropping point of the contaminated grease. Therefore, by pulling up the object to be cleaned (5) from the heated liquid (4) in this state, the contaminated grease adhering to the object to be cleaned (5) is dropped and removed from the object to be cleaned (5). It will be a thing.
4 加熱液体
5 被洗浄物
4 Heating liquid
5 Objects to be cleaned
Claims (3)
After the contaminated grease is removed and washed on the object to which the contaminated grease according to claim 1 is adhered, the contaminated grease remaining on the object to be cleaned is removed and washed with a cleaning solvent as a final cleaning. A cleaning method for removing contaminated grease from an object to be cleaned that has contaminated grease.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017180210A JP6306257B1 (en) | 2017-09-20 | 2017-09-20 | Cleaning method for removing contaminated grease from objects to be cleaned with grease |
| PCT/JP2018/017370 WO2019058624A1 (en) | 2017-09-20 | 2018-05-01 | Cleaning method for removing contaminant grease from object to be cleaned to which grease adheres |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017180210A JP6306257B1 (en) | 2017-09-20 | 2017-09-20 | Cleaning method for removing contaminated grease from objects to be cleaned with grease |
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| Publication Number | Publication Date |
|---|---|
| JP6306257B1 true JP6306257B1 (en) | 2018-04-04 |
| JP2019055353A JP2019055353A (en) | 2019-04-11 |
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| JP (1) | JP6306257B1 (en) |
| WO (1) | WO2019058624A1 (en) |
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| EP4008549A4 (en) * | 2019-08-01 | 2023-12-06 | Lintec Corporation | Film-like fired material with support sheet, roll body, laminate, and device manufacturing method |
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| JPH026048A (en) * | 1988-01-29 | 1990-01-10 | Monsanto Co | Method of heating vapor phase by using polyether per-fluoride |
| JPH05123658A (en) * | 1991-10-17 | 1993-05-21 | Japan Field Kk | Method for cleaning body to be cleaned and apparatus therefor |
| JP2000156562A (en) * | 1998-11-19 | 2000-06-06 | Sony Corp | Processor and method |
| JP2002282801A (en) * | 2001-03-27 | 2002-10-02 | Kobex Kk | Vacuum steam cleaning method and device for the same |
-
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- 2017-09-20 JP JP2017180210A patent/JP6306257B1/en active Active
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- 2018-05-01 WO PCT/JP2018/017370 patent/WO2019058624A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH026048A (en) * | 1988-01-29 | 1990-01-10 | Monsanto Co | Method of heating vapor phase by using polyether per-fluoride |
| JPH05123658A (en) * | 1991-10-17 | 1993-05-21 | Japan Field Kk | Method for cleaning body to be cleaned and apparatus therefor |
| JP2000156562A (en) * | 1998-11-19 | 2000-06-06 | Sony Corp | Processor and method |
| JP2002282801A (en) * | 2001-03-27 | 2002-10-02 | Kobex Kk | Vacuum steam cleaning method and device for the same |
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| WO2019058624A1 (en) | 2019-03-28 |
| JP2019055353A (en) | 2019-04-11 |
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