About ultrasonic cleaner

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About washing machine

What is an ultrasonic cleaner?

An ultrasonic cleaner is a cleaner that generates and cleans ultrasonic waves.

 

Originally widely used industrially, nowadays it has become a major measure that can be easily purchased by individuals for cleaning eyeglass cleaning machines and precious metal and wristwatch belts, thanks to ultrasound. Dirt that could not be removed by conventional cleaning methods can now be cleaned.

 

Ultrasonic cleaning enhances the cleaning effect by combining the physical action of ultrasound and the chemical action of the cleaning liquid.

What was not removed only by the chemical effect of the cleaning solution can be removed, dispersed and emulsified by physical action by cavitation and vibration acceleration, and fine dirt can be cleaned.

 

Ultrasonic cleaning can also be expected to achieve uniform cleaning quality and shorten cleaning time.

 

 

Why can ultrasound be cleaned?

1. Ultrasonic cavitation

Cavitation is a physical phenomenon in which a pressure difference is generated by the flow that occurs in a liquid and bubbles are generated and disappeared in a short time.

Also known as “cavity phenomenon”.

 

When powerful ultrasonic waves are irradiated into a liquid, countless microcavities (= cavitation) close to vacuum are generated.

A powerful shock wave is generated at the moment when the cavitation is crushed, and it is a mechanism that can destroy dirt directly from the workpiece and disperse it in the liquid for cleaning. This shock wave is actually quite powerful, and depending on the conditions, if a cavitation shock wave is applied to aluminum foil placed in water, a hole will open in tens of seconds.

 

Cleaning by cavitation is said to be effective against oil stains, and will remove dirt as shown below.

 

超音波洗浄機のしくみ

 

 

The degree of cavitation generation depends on the depth of the liquid, the type of liquid, and the frequency of the ultrasonic wave, and is adjusted according to the object to be cleaned.

The lower the frequency, the greater the cavitation, and the greater the shock wave when crushed.

The higher the frequency, the smaller the cavitation and the smaller the shock wave, so it can be used for cleaning precision parts.

 

 

2. Ultrasonic vibration

When the liquid is irradiated with ultrasonic waves, the liquid molecules vibrate.

The acceleration of this vibration is

1000 times in the case of 28kHz and

100000 times in the case of 950kHz

than the state where it is left still without applying ultrasonic waves.

The dirt is peeled off from the workpiece surface at this tremendous vibration speed.

 

950kHz ultrasonic waves are so fine that cavitation does not occur, so oil stains cannot be cleaned, but submicron stains can be cleaned.

 

 

About frequency

We wrote that oil dirt cannot be washed at a frequency of 950kHz, but the field of dirt that can be removed depends on the frequency.

By selecting an appropriate frequency, the cleaning effect can be maximized, so a prior check is required.

 

Let’s look at the compatibility between frequency and dirt in descending order of damage.

Frequency: 28kHz

The cleaning energy is strong, and it is ideal for removing oil and cleaning visible trash. This can wash metal parts and resin parts.

 

Frequency: 40kHz

As it is less damaging than 28kHz, ideal for washing precision parts and glass. Specifically, it plays an active role in cleaning glasses and accessories. Suitable for removing dust.

 

Frequency: 100kHz

This is a frequency that has recently attracted attention. Used when damage occurs even at 40kHz. Suitable for cleaning electronic precision parts such as hard disks and CSP boards.

 

Frequency: 160kHz

There is little damage to the workpiece, and fine dirt can be removed. Ideal for cleaning compound wafers and hard disks.

 

Frequency: 400kHz

0.2-5μm dirt can be cleaned.

 

Frequency: 1MHz

Used to remove invisible stains. There is little damage to the workpiece, and it is attracting attention with wafer cleaning.

 

Frequency: 3MHz

Ideal for 0.2μm cleaning. Acceleration is stronger than 1MHz, yet finer dirt than 1MHz can be removed.

 

 

Kind of Ultrasonic cleaner

The ultrasonic cleaning machine mainly consists of an ultrasonic vibrator that generates ultrasonic waves, an ultrasonic oscillator that moves the ultrasonic vibrator, and a tank that contains liquid.

 

There are two types of existing tanks, one with a vibrator and an oscillator, and the other with a tank and a vibrator / oscillator.

 

 

The advantage of another type of tank is that it can be handled with a special cleaning object even if the shape of the tank is unique, and it is relatively easy to move and move.

One-body type is easy to place even in a narrow space and is characterized by a relatively compact point.

 

In addition, there are many types that are soaked, and there are also types that wash by placing ultrasonic waves on the water flow. (See the figure below)

 

 

 

 

 

 

 

 

 

Some ultrasonic cleaners not only apply ultrasonic waves, but also have other functions.

For example, it is a function that can enhance the cleaning effect by combining it with ultrasonic waves, such as those with a heater that raises the liquid temperature and those with a decompression function.

 

There are many other useful functions such as an explosion-proof specification that can be used with various cleaning solutions, and a function that can change the frequency to handle various types of dirt. Let’s check well.

 

How to select an ultrasonic cleaner

Up to this point, you can see that there are various types of ultrasonic cleaners.

In addition to frequency and shape, the cleaning solution must also be compatible with the cleaning machine.

It is important to maximize the cleaning effect by combining the physical action of ultrasound and the chemical action of the cleaning solution.

 

1. Clarify the purpose of cleaning

Before selecting a washing machine, clarify what you want to wash once again.

Example) Degreasing, cleaning of abrasive powder and chips, removal of particles, etc.

2. Understand the type of workpiece

Make sure you know what is being cleaned.

Example) What is the size of the workpiece, what components are made of, etc ….

 

After carefully recognizing the situation, look at the washing machine. The following are important at that time.

 

3. Select the cleaning solution

here are lots of different types of cleaning liquids.

This selection is very important because if you select the wrong cleaning solution, you may not be able to clean at all.

In addition to water-based and solvent-based systems, “quasi-water-based” cleaning agents have recently attracted particular attention in ultrasonic cleaning.

Originally, ultrasonic cleaners were often cleaned using chlorofluorocarbon or chlorinated solvents, but alternatives are being investigated due to their adverse effects on health and the environment.

4. Select the frequency

As already introduced, the effect obtained by the frequency is different.

Therefore, you must select the frequency according to your purpose.

Also note that the tabletop type ultrasonic cleaner has few ultrasonic output points, and the cleaning performance will be different even at the same frequency.

5. Consider the cleaning position

In an ultrasonic cleaning machine, it is necessary to consider which part the pressure reaches most.

You may have grasped the size in (2), but even if a workpiece enters the washing machine, it is often the case that the workpiece is too large, which causes uneven cleaning, and in that state the cleaning effect cannot be 100%.

Generally, it is possible to eliminate unevenness by shaking or swing.

6. Select the insert tray

If a workpiece is placed directly in the cleaning tank, the workpiece may come into contact with the vibrator and normal ultrasonic waves will not be emitted, leading to defective cleaning and failure.

As countermeasures, it is common to use a container called an insert tray or a washing basket.

However, depending on the type of tray and the fineness of the mesh of the cleaning bowl, the ultrasonic wave may be greatly attenuated, and the cleaning effect may be reduced.

7. Liquid temperature setting

Generally, when the temperature of the liquid rises, bubbles are generated in the liquid and the ultrasonic wave becomes weaker.

However, when viewed with a single cleaning solution, the higher the temperature, the better the cleaning power. (However, do not raise the temperature above the limit temperature!)

Therefore, it must search for the point where the effects of the ultrasonic wave and cleaning solution are maximized, but this depends on the cleaning solution.

For example, in the case of water, 50-60 ° C is said to be optimal.

 

There are many points that must be taken into account, it will be difficult for people to use. However, if a suitable washing machine and solution are found, the workability will change greatly.

We are also accepting consultations on cleaning solutions, so please feel free to contact us!

 

Click here for Sankyo Chemical’s ultrasonic cleaners

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Comments for this article

  • 石丸 泰三 より:

    ニクロム線のコイリングに機械油を使用⇒油脂洗浄に超音波効果はどれ程でしょうか?

    • sankyo管理者 より:

      >>石丸様

      コメントありがとうございました。
      ニクロム線のコイリングの脱脂洗浄でございましたら、
      超音波洗浄は効果があり、洗浄可能でございます。
      ただ、その際の洗浄液の選定にはご注意いただきたいと思います。
      またお困りごとございましたら、こちらか、弊社ホームページお問い合わせ欄よりお気軽にお問い合わせください。

  • 犬ちゃん より:

    ドン・キホーテでメガネ用の超音波洗浄機見かけましたが、ああいうのって意味あるんですか?

    • sankyo管理者 より:

      >>犬ちゃん様

      コメントありがとうございます。
      端的に言わせていただくと、意味はあります!
      眼鏡には沢山の隙間が(レンズとフレームの間や、フレームの飾りなど)ありますが、その隙間に入ってしまった汚れなどを超音波洗浄機では落とすことができます。
      威力が弱いのではないか、もっと強いものがいいのではないかと思われるかもしれませんが、
      眼鏡は精密機器なので、あまり強い超音波で洗われてしまうとレンズに傷が入ってしまったり、精度に支障が出る可能性があります。

  • 荒木健治 より:

    家庭用ファンヒーター(機器)の掃除を大量に扱っています。
    構造が複雑で、機械の内部にも埃が付着しており、清掃に手間が掛かります。例えば洗浄液に機器をドブ漬けして、超音波洗浄できないでしょうか。又、ドブ漬けの場合電子部品に影響がありますか?その場合、早急な乾燥で対応できないでしょうか?

    • sankyo管理者 より:

      >>荒木健治様

      コメントありがとうございます。
      超音波は物理的な力になりますので、電子部品に影響を与える可能性がございます。
      その点は超音波洗浄機にもよりますので、超音波洗浄機メーカー様にご確認ください。
      また、洗浄液に関しては、
      洗浄されたいパーツがどの部分にあたるのかにもよります。
      コンデンサに電圧がかかっているとショートしてしまうものもございますので、
      炭化水素系洗浄剤などの極性のないものがおすすめですが、
      一方で炭化水素系ですと水溶性の汚れには不向きな面もございます。

  • ネッコ より:

    現在リールのメンテナンスをしようと超音波洗浄機を買いました。そこで、無水エタノールで洗浄しようと思うのですが洗浄効果ってどれほどのものなのでしょうか?

    • sankyo管理者 より:

      >>ネッコ様

      コメントありがとうございます。
      お返事が遅くなり申し訳ありません。

      リールの汚れの性質にもよりますので、試してみないと分かりません。
      ですが無水エタノールは引火点が低く、
      その液体を防爆仕様でない電子機器にかけるということは、火花が散ったりして火災につながることが多く弊社としてはあまりお勧めできません。

  • マフティー・ナビーユ・エリン より:

    こんにちは、チタン合金を超音波洗浄で脱脂をしたいのですが。効果的な洗浄液とかわかりますでしょうか?

    • sankyo管理者 より:

      >>マフティー・ナビーユ・エリン様

      コメントありがとうございます。
      洗浄剤は数多ございますので、マフティー様がどのような条件の洗浄剤をご希望するかによっても変わってきます。
      また、使用されている超音波洗浄機は防爆仕様のものでしょうか。
      防爆仕様になっていなければ、非危険物や引火点40℃以上の洗浄剤をご使用ください。

  • かーちゃん より:

    SUS304の表面に付着した異物を除去したいのですが、超音波洗浄て可能ですか?
    出力は50~70mv程度です。

    • sankyo管理者 より:

      >>かーちゃん様

      コメントありがとうございます。
      超音波洗浄機によっても、相性が異なる場合がございますので
      お手持ちの超音波洗浄機のメーカー様へお問い合わせください。

  • 匿名希望 より:

    鋳物製品で、成形後、中子を取り除くのですが表面に砂が残るので超音波洗浄したい。
    洗浄に最適な超音波照射位置を特定したいのでコンピュータシミュレーションしてくれと言われました。どうしたらよいですか?
    シミュレーションツールなのあるのでしょうか?
    流体解析や構造解析ならよくやっているのですが、超音波はどんな物理法則をどのように解くのかさっぱりです。
    (キャビテーションがないなら音響解析ツールでもよいような気がします。)

    • sankyo管理者 より:

      >>匿名希望様

      コメントありがとうございます。
      超音波のシュミレーションに関しては、超音波洗浄メーカー様にお伺い頂くことをお勧め致します。
      申し訳ありません。

  • ふじ より:

    金属巻き線フィルターのスケール除去に使用したいのですが、適切な周波数や被洗浄物との距離など、気を付ければよいことはありますか?

    • sankyo管理者 より:

      >>ふじ様

      コメントありがとうございます。
      弊社でご紹介をしておりますのが、一般的な周波数についてでございますので、
      具体的な事例や、実際にどのように使用したらよいかは、
      機材によってもまちまちのため、洗浄機メーカー様へお問い合わせいただくのが確実です。

  • 谷  より:

    こんにちは。最近、40Hz超音波洗浄器を流しに設置して食洗機として使える商品が日本で予約販売開始されました。Brand Design Plusという会社です。購入を検討しています。中国製なので、他の商品の様に40Hzの超音波がちゃんと出ていない可能性はありますが、40Hzの超音波が出たとして、従来の食洗機の様に油汚れや様々な食器汚れを洗う事は可能ですか?

    • sankyo管理者 より:

      >>谷様

      コメントありがとうございます。
      実際に弊社でそちらの製品を使用して実験していないので、なんとも申し上げることができません。申し訳ありません。
      もしメーカー様が中国語のみの対応であれば、販売店様へお問い合わせ頂くのがよろしいかと思います。

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