1、The air in the deep hole and the parts can be sucked out, the cleaning liquid can easily flow in, and the cleaning ability can be greatly improved.
2、When the gas in the cleaning liquid is removed, the effect of ultrasound is better.
3、The cleaning liquid can be heated to the ignition point and the solubility of dirt is doubled.
4、In cleaning, high temperature liquid is used to provide uniform and necessary heat for drying process.
5、In vacuum, the boiling point of solution decreases and evaporation rate accelerates, because of the rapid formation of high vacuum, the solvent coated on the object evaporates at one stroke.