Removal of Buffs by Ultrasound – Use of Spherical Nebula Cavities 2024/5/2
Cleaning after buffing has been a challenge in the cleaning industry for 40 years, and removal methods have changed over time. In the past, solvents were often used, but now alkaline cleaners are often used.
When using alkaline water-soluble cleaning agents, the temperature should be set to 35°C to 55°C and ultrasonic irradiation should be used to clean.
The difference between Blue Star R&D and other companies is the shape of the cavity at this time. Blue Star R&D usually generates spherical nebula cavities of 3 to 6 mm in diameter and uses the positive and negative impact force to remove buffing powder and deteriorated, sometimes baked-on, carbonized tallow. In the case of other companies, the cleaning process utilizes the positive and negative impact force of gas nebula cavities, which are generated by a series of micro cavities less than 1 mm in diameter in a striated pattern. In the former case, the cavities are alone and move vertically on the diaphragm at a speed of 50 m/s or more, while in the latter case, they exist in a dense horizontal streak-like array on the diaphragm. This is sometimes referred to as standing wave formation.
If the type of liquid is the same, the temperature is the same, and the frequency is the same, the impact energy of the cavity generated by ultrasonic waves is proportional to the third power of the diameter and the square of the velocity, since it is a mass transfer. Therefore, the difference between the impact energy of 1 mm in diameter and that of 5 mm in diameter is five times the ratio of the diameters squared. In other words, the impact force of one of our buffing cavities for buffing removal (dare I say it, positive – at onset, negative/explosion – at extinction) is 5 to the 5th power of 5 to 3125 times that of another company’s 1mm. In reality, we believe that the 1mm cavities exist in groups in the horizontal direction, and therefore, the impact force will be mitigated to less than one-tenth of this value. The energy used out of the total energy of the generated cavities for a 1 mm buffing residue (let’s say 1 mm square) is about one 300th of the total energy used. Of course, we assume that this buffing residue exists on a cavity sphere of 5 mm diameter and is at one.
In any case, the positive and negative impact forces of our spherical nebula type are 10 to 100 times greater than those of ordinary ultrasonic cleaning, and the impact energy is used to remove buffs.
If you are still having trouble with buffing, please visit our laboratory to solve your problem. by shibano