ultrasonic cleaning electronic manufacturing PCB assembly

ultrasonic cleaning PCBA turnkey assembly Manufacturing

ultrasonic cleaning PCBA turnkey assembly Manufacturing
In an ultrasonic cleaner, the object to be cleaned is placed in a chamber containing a suitable solution (in an aqueous or organic solvent, depending on the application). In aqueous cleaners, surfactants (e.g., laundry detergent) are often added to permit dissolution of nonpolar compounds such as oils and greases. An ultrasound generating transducer built into the chamber, or lowered into the fluid, produces ultrasonic waves in the fluid by changing size in concert with an electrical signal oscillating at ultrasonic frequency. This creates compression waves in the liquid of the tank which ‘tear’ the liquid apart, leaving behind many millions of microscopic ‘voids’ or ‘partial vacuum bubbles’ (cavitation). These bubbles collapse with enormous energy; temperatures and pressures on the order of 5,000 K and 20,000 lbs per square inch are achieved;[6][7] however, they are so small that they do no more than clean and remove surface dirt and contaminants. The higher the frequency, the smaller the nodes between the cavitation points, which allows for cleaning of more intricate detail.

Ultrasonic transducers showing ~20 kHz and ~40 kHz stacks. The active elements (near the top) are two rings of lead zirconate titanate, which are bolted to an aluminium coupling horn.
Transducers are usually piezoelectric (e.g. made with lead zirconate titanate (PZT), barium titanate, etc.), but are sometimes magnetostrictive. The often harsh chemicals used as cleaners in many industries are not needed, or used in much lower concentrations, with ultrasonic agitation. Ultrasonics are used for industrial cleaning, and also used in many medical and dental techniques and industrial processes.

Cleaning solution[edit]
Ultrasonic activity (cavitation) helps the solution to do its job; plain water would not normally be effective. The cleaning solution contains ingredients designed to make ultrasonic cleaning more effective. For example, reduction of surface tension increases cavitation levels, so the solution contains a good wetting agent (surfactant). Aqueous cleaning solutions contain detergents, wetting agents and other components, and have a large influence on the cleaning process. Correct composition of the solution is very dependent upon the item cleaned. Solutions are mostly used warm, at about 50–65 °C (122–149 °F), however, in medical applications it is generally accepted that cleaning should be at temperatures below 45 °C (113 °F) to prevent protein coagulation.

Although propellers seem to spin incredibly fast when moving a boat, the bubbles they produce from that spinning can’t be used to clean. This is because while Morantz Ultrasonic Cleaning Systems do clean using cavitation, the bubbles produced by our Ultrasonic machines are very different from those produced by a propeller in two important ways:

First, our bubbles are enormously powerful compared to propeller bubbles.
Second, our bubbles are microscopic which makes them incredibly efficient.
How Cavitation Cleans

ULTRASONIC CLEANING involves the use of high-frequency sound waves (above the upper range of human hearing, or about 18 kHz) to remove a variety of contaminants from parts immersed in aqueous media. The contaminants can be dirt, oil, grease, buffing/polishing compounds, and mold release agents, just to name a few. Materials that can be cleaned include metals, glass, ceramics, and so on. Ultrasonic agitation can be used with a variety of cleaning agents: detailed information about these agents is available in the other articles on surface cleaning in this Section of the Handbook.

Typical applications found in the metals industry are removing chips and cutting oils from cutting and machining operations, removing buffing and polishing compounds prior to plating operations, and cleaning greases and sludge from rebuilt components for automotive and aircraft applications.

Ultrasonic cleaning is powerful enough to remove tough contaminants, yet gentle enough not to damage the substrate. It provides excellent penetration and cleaning in the smallest crevices and between tightly spaced parts in a cleaning tank.

This generator has the ability to perform in a variety of aqueous and semi-aqueous cleaning chemistries. The generator operates at a base 40 kHz frequency and a 4 kHz sweep (+ 2 kHz and - 2 kHz). Sweep rate is how fast the output sweeps between 38 to 42 kHz. On the front panel of the generator on the right hand side there is a control that controls the sweep rate (300 Hz to 1000 Hz). Turn clockwise to increase sweep rate. For most aqueous solutions the sweep should be set in the full counter clock-wise position (300 Hz). For more viscous solutions and various hydrocarbon-based solutions the sweep typically should be set at full clockwise position 1000 Hz, high enough to reach peak cavitation performance. Certain applications will deviate from these standard sweep rate settings.

Ultrasonic cleaning is one of the most modern processes today that particularly effectively and efficiently removes dirt and other contamination in the shortest time and without damage from many different products to be cleaned.

Why is Ultrasonic Cleaning so Efficient and Effective?
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The ultrasonic energy is created within a liquid by means of transducers, which convert electrical energy into acoustic energy. These transducers are similar in function to a radio speaker except they function at ultrasonic frequencies (40,000 Hz) and transmit acoustic energy to a liquid rather than to air. The transducers consist of vibrating elements (piezoelectric disc) bolted between thick metal plates. The transducers are bonded to the underside of the tanks containing the cleaning liquid or are encased in stainless steel for immersion within a liquid. For reliability, many transducer modules are uniformly distributed over the tank bottom rather than having a single transducer in the center of the tank working very hard. An electronic generator energizes the transducers. The generator transforms the electrical energy from the wall outlet into a suitable electrical form for efficiently energizing the transducers at the desired frequencies. All ultrasonic cleaning systems consist of the four fundamental components; transducer, generator, container for liquid, and cleaning liquid. The performance and reliability of the system depends upon the design and construction of the transducers and generators. The overall effectiveness of the cleaning is dependent upon the cleaning liquid. The size of the tank is dependent upon the size or quantity of the parts being cleaned. The number of transducers and generators is determined by the tank size. The choice of cleaning liquid depends upon the parts being cleaned and contaminant to be removed.

VERSATILITY OF ULTRASONIC POWER CORPORATION (UPC) EQUIPMENT

UPC manufactures engineered equipment that fulfills the broad spectrum of perform¬ance requirements dictated by the various cleaning applications. The varied frequency requirements are met by UPC’s “Simultaneous Multi-frequency®” which provides many frequencies at the same time, thus eliminating the difficulty of choosing a particular frequency for a particular cleaning application.

The exclusive UPC features of “Simultaneous Multi-frequency®” provide the most versatile equipment available on the market. The UPC “Vibra-bar®” transducer module and generator module combine to provide equipment having maximum reliability and simplified field maintenance.

The UPC product line consists of the generator modules and standard “Vibra-bar®” transducer modules. In addition, immersible transducers can be built to be used within existing installations or where application flexibility is required.

Ultrasonic power corporation facilities provide one source for all phases of industrial ultrasonic equipment. All of our products have been designed and developed by UPC engineers and are manufactured by UPC personnel. This experience and ability is available for field assistance on ultrasonic cleaning equipment applications.

“SIMULTANEOUS MULTI-FREQUENCY®"

The versatile performance of UPC equipment results from the simultaneous presence of many ultrasonic frequencies, 40 through 90 kHz, within the cleaning chamber. The higher frequencies, with their greater penetrating capability, initiate the cleaning by loosening soils in inaccessible areas, such as tapped holes and undercuts. This allows the heavy duty lower frequencies to rapidly and thoroughly complete the cleaning operation. The presence of more than one frequency also reduces the probability of damage to frequency sensitive parts, as it avoids the single strong resonance found in conventional ultrasonic tanks. The cooperating effect of many frequencies insures constantly uniform and thorough cleaning.

“Simultaneous Multi-frequency®” is accomplished by energizing the patented rectangular “Vibra-bar®” transducer module at two critical points with active piezoelectric stacks. This causes complex vibrational modes, which creates more than one frequency in the cleaning bath. This is similar to the creation of various resonant frequencies by vibrating a rectangular, rather than circular, drumhead. The dominant frequency is 40 kHz, but significant energy is produced at other higher frequencies.

Another important UPC advantage is the elimination of undesirable standing wave patterns, which are always present in conventional single frequency ultrasonic cleaners. Because of the coexistence of frequencies with many different wavelengths, UPC equipment provides extremely uniform energy distribution throughout the entire fluid volume. So called "dead" spots simply do not exist with UPC ultrasonic equipment. Degassing is also efficient with UPC equipment because of the presence of the dominant frequency of 40 kHz.

POWER INTENSITY CONTROL

To further increase the versatility of UPC equipment, an adjustable output power control is on all model 5300 and 5400 series generators. This control, combined with “Simultaneous Multi-frequency®”, extends the equipment cleaning ability to very fragile items such as semiconductor devices, wafers and delicate glass parts. The adjustable output power control provides maximum flexibility over a wide range of cleaning applications. It also maximizes the equipment performance when used for solution degassing.

MODULATION SWEEP CONTROL

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ENGINEERED RELIABILITY OF UPC EQUIPMENT

The fundamental reliability of the UPC line is the result of the design and construction of the patented “Vibra-bar®” transducer modules and generator modules. These standard modules are used throughout the entire product line, thereby eliminating "one time untried designs". Required production tooling and facilities have been engineered to insure consistent product quality control. Spreading out from the standard module base are system designs and fabrication that are the result of years of specific field experience in ultrasonic cleaning applications.

“VIBRA-BAR®” TRANSDUCER MODULE RELIABILITY

It depends, on a small tank you can easily change the solution for a fresh one quite quickly, a large tank can require up to 2-3 hours changing the solution and reheating to the proper temperature. It also depends on how dirty your parts are. Extremely dirty parts will overwhelm the chemistry and solution and require a change of cleaning solution more often.

The answer to these problems is a filtration system that will re circulate the cleaning fluid though a filter of the appropriate type and return it to the tank. There are several things to keep in mind when using a filter system.

1.You should run the filter at no more than 1-2 gallons per minute if you are using the ultrasonics at the same time. The pump in a filter system will introduce air into the liquid and lower the ultrasonic activity if it is run at a higher rate. It is better to run the filter between cleaning cycles

2.Even with a filter, there comes a time when the tank must be emptied and cleaned as the soap or other cleaning agent is exhausted.

3.Filters should be changed on a regular basis.

Should I rinse my parts after cleaning in an ultrasonic tank?

In most cases rinsing will improve the final result, When you use a detergent of any type you will leave a residue of that detergent on a part. The best way to remove this residue is to rinse in DI water spray and or another Ultrasonic tank filled with a continuous over flow of Hot DI water. This will remove any traces of the cleaning chemical.

Spray Rinse Tanks are designed to be a little larger than the ultrasonic tank that is used. The spray is delivered from 2 or more spray bars on the topsides of the tank. The drain is usually twice the size of the inlet. In most cases a point of use DI water heater is used to deliver a hot spray rinse. The tanks can be made of Polypropylene or stainless steel.

A point of use DI water heater uses ceramic heaters to instantly raise the temperature of the DI water as it flows into the tank A switch that is sensitive to the flow of water into the heater activates the system on demand. The ultimate temperature that is reached is dependent on the flow rate of the water and the power of the heater. It must be sized to the demand of the system.

How should I dry my parts?

There are several methods of drying parts that range from air dry to baking in an oven. The most common way to dry your parts is to simply let them dry in a warm area that has clean air. If you need to keep the parts very clean you can use a commercially available HEPA filtered drying system. This will dry your parts with hot filtered air in clean room conditions. Infra red lams are also used.

Can I use flammable solvents in an ultrasonic cleaner?

Flammable solvents can be used in special types of ultrasonic tanks that are custom built for that purpose. You should make every effort to find a non-flammable solvent or process before resorting to using flammable solvents in an ultrasonic system. The tank must be constructed so that a freeboard equal to the depth of the liquid in the tank is included in the design. Other considerations are the inclusion of a condenser coil in the freeboard area that will re condense the vapor from the flammable solvent so that it does not escape the tank. The tank must also have a sealed transducer compartment that is purged with an inert gas. This prevents any sparks or other electrical malfunction from igniting any vapor that may have found its way to that area.

Since most flammable solvents have a low density they form a fuel air mixture [ the military uses this principal as a very effective bomb] above the liquid when ultrasonically activated. For this reason tanks should be mounted in a stainless steel fume hood and the generators located outside any flammable area. Infra red fire suppression systems are required by most local rules.

Small amounts of flammable solvents such as alcohol may be used in an ultrasonic cleaner only if the solvent is in a beaker that is immersed in the water of the tank. The beaker should be capped and the entire unit should have adequate ventilation. Care must be exercised when using this method to prevent fire.

The cost of a system of this type is 5-10 times the cost of a tank that uses water as the base cleaning liquid. It is imperative to follow all the requirements when using flammable solvents in any ultrasonic system. You should check with your plant facilities personnel and with the ultrasonic manufacturer for complete information. Failure to do so could result in explosion and fire.

Cleaning Chemistry
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What is De Ionized Water and why should I use this for cleaning?

De Ionized water is water that has had all of the minerals, particulates, and dissolved ions removed by a filtration process. It is extremely pure water. The level of purity is expressed in Meg Ohms [resistance to an electrical current]

What is a point of use DI water Heater?

DI water is extremely active. It will pull ions from any surrounding metal, including stainless steel. To heat DI water in a stainless steel vessel is possible though if it remains standing in the vessel it will eventually pick up ions and deteriorate. A better method is to heat the DI water only when it is needed.

Ultra pure DI water is rated at 18 Meg Ohms this is extremely pure water. Lesser grades of DI water are also used for cleaning. [10 meg ohm etc.] It is so clean that if you drank it would pull the ions from your body chemistry and would cause serious health problems,

DI water has a great capacity for ions; it will pull them from the contaminants that are on your parts. It is an extremely active cleaner in itself. The use of DI water will greatly improve your cleaning results.

Distilled water is also a good cleaner when you do not need the full benefit of DI water. Another good reason to use distilled or DI water is that the rinsing process is greatly improved and it leaves no residue to cause spotting on your parts. Hot DI water is even more effective in cleaning and rinsing.

Is the cleaning chemical important?

Solutions are the most single influential variable in ultrasonic cleaning. Properties of the specific fluid interact greatly, that is, some fluids operate quite well at ambient temperatures while others operate better at 140 to 160 degrees F. Some fluids require wetting agents [surfactants, detergents] to effectively transfer the ultrasonic energy into the solution. Water always requires a wetting agent and operates better at the higher temperatures. The choice of a detergent is dependent on the type of soils to be removed. This is one of the more important choices to make in any ultrasonic cleaning process.

The intensity with which cavitation takes place in a liquid medium varies greatly with the Colligative properties of that medium which include vapor pressure, surface tension, viscosity, and density as well as any other property that is related to the number of atoms, ions or molecules in the medium. In ultrasonic cleaning applications, the surface tension and the vapor pressure characteristics of the cleaning fluid play the most significant part in determining cavitation intensity and cleaning effectiveness. The energy required to form a cavitation bubble in a liquid is proportional to both surface tension and vapor pressure. The higher the surface tension of a liquid, the greater will be the energy that is required to produce a cavitation bubble and the greater will be the shock wave energy that is produced when the bubble collapses, In pure water whose surface tension is about 72 dynes/cm sq. , cavitation is produced only with great difficulty at ambient temperatures. It is easily produced when a surface-active agent is added to the liquid, reducing the surface tension to about 30dys/cm sq. When the vapor pressure of a liquid is low, as is the case with cold water, cavitation is difficult to produce but becomes less and less so as the temperature is increased. Every liquid has a characteristic temperature relationship in which cavitation exhibits maximum activity within a fairly narrow temperature range.

The flow characteristics or reological properties of the cleaning applications static fluid conditions are highly conducive to the formation of the standing wave pattern that characterize intense ultrasonic fields, and hence it would seem likely that cavitation intensity would be maximized under such conditions. Optimum performance is seldom achieved in static fields since continuous purification of the cleaning fluid either by overflow or by recycle filtration [filtering up to 50% of the tank volume per minute] is a prerequisite to effective cleaning. When the filtered liquid is properly introduced into the bath little or no cavitation is lost. In fact, improvement in overall surface impingement and homogeneity of cleaning can be attained with this method.

Acidic type cleaners are typically used for removal of scale, rust and calcium deposits. Heavy acid cleaners are used for pickling parts as they are cleaned, since in a good ultrasonic system the parts are striped to the bare metal and all natural oxides are removed the part will oxidize rapidly after extraction unless protected either by pickling or by addition of rust inhibitors to the cleaning solution

The “Vibra-bar®” transducer module is permanently bonded to the radiating surface by means of a high temperature adhesive. Each stack utilizes only a single PZT element and single center bolt, thus providing increased reliability over designs with several PZT elements and bolts. The PZT element is relatively thin and under compression, which results in a strong structure. The PZT is similar to concrete in that by itself it tends to be brittle, but under compression, it is one of the strongest materials. The PZT in the UPC designs is not the normal commercially available formulation. The UPC formulation has special additives to obtain low dissipation, high density, and low porosity, resulting in improved performance, negligible aging and reliability. The PZT element has a curie temperature above 620°F and during manufacture is heat stabilized and pre-aged at 400°F. The special formulation and pre-aging eliminate any of the previous difficulties with PZT elements, such as changing characteristics after field usage. The field aging of the UPC elements is less than 1 percent.
In an ultrasonic cleaner, a wave generator is connected to a diaphragm, the cone-shaped part that vibrates inside of a speaker. The generator causes the diaphragm to vibrate at a specific frequency and amplitude. Instead of causing air molecules to vibrate like a speaker does, the diaphragm causes the water molecules in the bath to vibrate.
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The use of ultrasonics in cleaning has become increasingly popular due to the restrictions on the use of chlorofluorocarbons such as 1,1,1-trichloroethane. Because of these restrictions, many manufacturers and surface treaters are now using immersion cleaning technologies rather than solvent-based vapor degreasing. The use of ultrasonics enables the cleaning of intricately shaped parts with an effectiveness that corresponds to that achieved by vapor degreasing. Additional information about the regulation of surface cleaning chemicals is contained in the article “Environmental Regulation of Surface Engineering” in this Volume. The article “Vapor Degreasing Alternatives” in this Volume includes descriptions of cleaning systems (some using ultrasonics) that have been designed to meet regulatory requirements while at the same time providing effective surface cleaning.

PROCESS DESCRIPTION
In a process termed cavitation, micron-size bubbles form and grow due to alternating positive and negative pressure waves in a solution. The bubbles subjected to these alternating pressure waves continue to grow until they reach resonant size. Just prior to the bubble implosion (Fig. 1), there is a tremendous amount of energy stored inside the bubble itself.

Temperature inside a cavitating bubble can be extremely high, with pressures up to 500 atm. The implosion event, when it occurs near a hard surface, changes the bubble into a jet about one-tenth the bubble size, which travels at speeds up to 400 km/hr toward the hard surface. With the combination of pressure, temperature, and velocity, the jet frees contaminants from their bonds with the substrate. Because of the inherently small size of the jet and the relatively large energy, ultrasonic cleaning has the ability to reach into small crevices and remove entrapped soils very effectively.

Ultrasonic cleaning uses high frequency sound waves to generate cavitation in the liquid. The resulting energetic bubble action penetrates blind holes, cracks, and recesses to thoroughly remove all traces of contamination adhering or embedded on the solid surface. Contaminants can include dust, dirt, oil, pigments, grease, polishing compounds, flux agents, soot, and more.

Ultrasonic cleaners come in many types, from home models that cost less than $50 to industrial grade models that sell for thousands, but the underlying theory is the same. Each cleaner has a "bath" area that is filled with water (or a water-detergent mix). At the bottom of the bath there is a device that makes ultrasonic waves by vibrating up and down thousands of times each second.

Sound waves are created by vibrating molecules. When you talk to a friend, for example, the act of speaking vibrates the air molecules around your mouth in specific ways. These vibrations, or sound waves, propagate through the air and eventually vibrate your friend's ear drum. The vibrations are turned into electrical signals, which the brain interprets as sound. (For more on sound waves visit How Sound Waves Work).

Ultrasonic energy exists in a liquid as alternate rarefactions and compressions of the liquid. During rarefaction, small vacuum cavities are formed which collapse, or implode, during compression. This continuing rapid process, called cavitation, is responsible for the scrubbing effect which produces ultrasonic cleaning. Three factors affecting the scrubbing action are the degree of liquid degassing, the ultrasonic frequency and the chemical characteristics of the liquid at specific temperatures.

Degassing is the removal of unwanted air from the liquid, typically found in fresh tap water. As the cavities form, they fill with the unwanted air forming bubbles, which resist collapse and tend to remain suspended in the liquid. These bubbles act as "shock absorbers," which materially reduce cleaning efficiency. The amount of air can be reduced by periodically switching off, or modulating, the sound energy to permit adjacent bubbles to coalesce, float to the surface, and escape. The type of modulation is important, for the correct balance between degassing and cleaning efficiency must be selected for each cleaning application.

Frequency affects cleaning efficiency by determining the cavity size. Low frequencies generate large but relatively few cavities with high cleaning power. High frequencies generate a great number of small cavities with good penetrating capability. The selection of the correct frequency is difficult, for it varies with each cleaning application. The frequency also affects degassing, with 40 kHz nearly optimum.

Cleaning efficiency is also affected by the chemical and physical characteristics of the liquid. For best cleaning, the liquid must chemically soften the soil, yet maintain effective cavitation and provide the desired characteristics for rinsing and drying the cleaned parts. Ultrasonic cleaning solutions are broadly characterized as aqueous or non-aqueous. Final selection is dependent upon the overall process considerations for the cleaning application.

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With the Elmasonic series, we have developed powerful ultrasonic cleaners that are available as different models for our customers for different applications.

All Elmasonic units have a case made of stainless steel that is robust on the one hand and on the other hand can be cleaned and disinfected easily. Thanks to a wide range of accessories and appropriate machine functions, the individual machine series are ideally designed for the individual sectors.

What does this have to do with cleaning?

The vibrations in the water cause tiny cavities (bubbles) to form, about the size of a red blood cell or bacteria. However, the constant vibrating puts pressure on the cavities—they are rapidly stretched and compressed. This causes the cavities to violently implode, and if they are near a hard surface, turn into jets of liquid traveling at high speeds. An object submerged in the bath is hit by these jets millions of times per second. On impact the jets dislodge particles like dust and oil from the object, giving it a nice cleaning. The cavities are very small, so despite the millions of collisions the process is gentle.

This method is often used to clean intricate objects because the cavities are small enough to get into all of the cracks and crevices, cleaning the places that we can't otherwise reach.

There are many variations of ultrasonic cleaners. They can be designed to operate at a specific frequency that most efficiently cleans a specific type of surface. For example, higher frequencies create smaller cavities and so are better for cleaning very intricate objects. Some cleaners are designed to use a water-detergent mix to speed up the cleaning process or aid in rinsing and drying. And, of course, cleaners come in different sizes in order to accommodate objects of different sizes.
From our sophisticated Benchmark Series to the compact Omni Series, Branson aqueous cleaning systems are designed to meet the most demanding production requirements.

Blackstone-NEY Ultrasonics is the leading provider of industrial and precision ultrasonic cleaning equipment. We design and manufacture efficient and environmentally sound solutions for challenging parts cleaning applications.

It seems that each advance in technology demands greater and greater attention to cleanliness. As a result, Blackstone-NEY Ultrasonics has been challenged to meet these exceedingly high expectations and has done so through rapid innovation. Many of these advances have involved the use of ultrasonic cleaning technologies utilizing multiple frequency ultrasonic generators and advanced waveform ultrasonic generators. These cutting edge ultrasonic cleaning technologies are used by our most demanding OEM customers to remove sub-micron particles from hard disk drive components and silicon wafers.

While the cleaning industry continues to use solvent degreasing with alternative Sodium Hydroxide friendly" means of parts washing. Although substitute water-based, aqueous degreasers, citrus degreasers and petroleum based chemistries are available, they are sometimes less effective as cleaners than the solvents and may not perform adequately in some applications unless a mechanical energy boost is added to assure the required levels of cleanliness. Ultrasonic energy is now used extensively in critical cleaning applications to both speed up and enhance the cleaning effect of these alternative chemistries.

Preconfigured or modular, Branson aqueous cleaning systems are typically used for particulate removal, oil removal, defluxing and many other precision cleaning applications. All of our systems are environmentally friendly, compatible with many materials and can be used with a wide range of chemistry options.

An excellent demonstration of this phenomenon is to take two flat glass microscope slides, put lipstick on a side of one, place the other slide over top, and wrap the slides with a rubber band. When the slides are placed into an ultrasonic bath with nothing more than a mild detergent and hot water, within a few minutes the process of cavitation will work the lipstick out from between the slide assembly. It is the powerful scrubbing action and the extremely small size of the jet action that enable this to happen.

ULTRASOUND GENERATION
In order to produce the positive and negative pressure waves in the aqueous medium, a mechanical vibrating device is required. Ultrasonic manufacturers make use of a diaphragm attached to high-frequency transducers. The transducers, which vibrate at their resonant frequency due to a high-frequency electronic generator source, induce amplified vibration of the diaphragm. This amplified vibration is the source of positive and negative pressure waves that propagate through the solution in the tank. The operation is similar to the operation of a loudspeaker except that it occurs at higher frequencies. When transmitted through water, these pressure waves create the cavitation processes.

The resonant frequency of the transducer determines the size and magnitude of the resonant bubbles. Typically, ultrasonic transducers used in the cleaning industry range in frequency from 20 to 80 kHz. The lower frequencies create larger bubbles with more energy, as can be seen by dipping a piece of heavy-duty aluminum foil in a tank. The lower-frequency cleaners will tend to form larger dents, whereas higher-frequency cleaners form much smaller dents.

Since bubbles such as those created through Cavitation are just empty space, there’s nothing to keep them open. As a result, these bubbles collapse, or implode, almost as fast as they are created. In our machines, this happens millions of times per second. This constant implosion produces tremendous vacuum energy in the form of heat and pressure. It’s this combination of heat and pressure which gives Ultrasonics its cleaning capability and power.

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industrial ultrasonicdigital mini ultrasonic cleaner for mini ultrasonic jewelry cleaning
12 Sets (Min. Order)
Material: Metal / Coil
Brand Name: DADI
Model Number: 968
Fuel: Electric
Cleaning Type: Industrial Ultrasonic Cleaner
Power(W): 30W/50W
industrial ultrasonicdigital mini ultrasonic cleaner for mini ultrasonic jewelry cleaning 3 Photos
Guangzhou Sunshine Electronic Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
30 Transactions(6 months)
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Small Size 30W/50W Dual Power Digital Ultrasonic Cleaner 600ml
US $12.5-13.94 / Set
1 Set (Min. Order)
Voltage (V): 220
Power (W): 50
Model Number: DA968
Capacity: 600
Place of Origin: Guangdong,China (Mainland)
Certification: CE
Small Size 30W/50W Dual Power Digital Ultrasonic Cleaner 600ml 5 Photos
Guangzhou MaYuan Electronic Technology Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
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Quickly and effectively cleaning,800ml ultrasonic cleaner
US $26-32 / Piece
150 Pieces (Min. Order)
Voltage (V): 220
Power (W): 50
Model Number: YB-JP-008
Capacity: 0.8
Place of Origin: Guangdong,China (Mainland)
Certification: CE,RoHS
Quickly and effectively cleaning,800ml ultrasonic cleaner 4 Photos
Shenzhen Yomband Electronics Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
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Record ultrasonic cleaning machine for record ultrasonic cleaning
US $350-500 / Set
1 Set (Min. Order)
Material: Metal / Coil
Brand Name: JSM
Cleaning Process: Hot Water Cleaning
Place of Origin: Shandong,China (Mainland)
After-sales Service Provided: Overseas third-party support available
Certification: CE
Record ultrasonic cleaning machine for record ultrasonic cleaning 6 Photos
Shandong Jie Siming Precision Machinery Equipment Co., Ltd.
China (Mainland) Trade Assurance
Transaction Level:
7 Transactions(6 months)
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Ultrasonic cleaning s1yq65 large capacity digital ultrasonic cleaner
US $16.9-17.15 / Piece
100 Pieces (Min. Order)
Voltage (V): 220
Power (W): 50
Model Number: BW 2407075-e5v
Capacity: 600
Place of Origin: Guangdong,China (Mainland)
Brand Name: Bothwinner
Ultrasonic cleaning s1yq65 large capacity digital ultrasonic cleaner 4 Photos
Shenzhen Bothwinner Plastic Electronic Factory
China (Mainland) Trade Assurance
Transaction Level:
35 Transactions(6 months)
20,000+
Response Rate
83.3%
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High Quality Ultrasonic Cleaner For Motherboard Cleaning

When cavitation happens near a dirty object, the vacuum action produced by those million of bubbles constantly imploding creates a tiny pressure wave that reaches deep into every nook and cranny of even the most delicate items. This tiny pressure wave dislodges and breaks up the dirt and other contaminants and gently lifts it away. The result is very fast and effective cleaning.

How Morantz Ultrasonic Machines Create Cavitation

To create cavitation, Morantz Ultrasonic Cleaning Systems use our state-of-the-art Prowave™ Digital Generators to power electro-mechanical transducers that are submerged in a tank of hot water. These generators activate the transducers which then vibrate very quickly. This vibration sends sound waves through the water at frequencies ranging from 25 to 40kHz which produces cavitation.

Water-based solutions are more limited in their ability to remove contaminants by chemical action alone than solvent solutions; e.g. for delicate parts covered with thick grease. The effort required to design an effective aqueous-cleaning system for a particular purpose is much greater than for a solvent system.

Some machines (which are not unduly large) are integrated with vapour degreasing machines using hydrocarbon cleaning fluids: Three tanks are used in a cascade. The lower tank containing dirty fluid is heated causing the fluid to evaporate. At the top of the machine there is a refrigeration coil. Fluid condenses on the coil and falls into the upper tank. The upper tank eventually overflows and clean fluid runs into the work tank where the cleaning takes place. Purchase price is higher than simpler machines, but such machines are economical in the long run. The same fluid can be reused many times, minimising wastage and pollution.

Carbon tetrachloride was used in the past, but is now prohibited as a health hazard.

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