Ultrasonic Dispersion And Oil Removal

Before the parts are electroplated, the oil stains on the surface of the parts should be cleaned to enhance the bonding force between the parts and the coating and improve the adhesion of the coating. Ultrasonic can strengthen the oil removal process by dispersing and emulsifying, shorten the oil removal time, improve the oil removal quality, and reduce the consumption of chemicals. Especially for parts with complex shapes, small precision parts, parts with difficult-to-remove dirt on the surface and parts made of insulating materials, it has a significant degreasing effect, which can save time-consuming manual labor and prevent damage to parts.

First, the principle of ultrasonic degreasing

When the ultrasonic wave acts on the degreasing liquid, due to the conduction of the pressure wave (sparse and dense waves), the solution is subjected to negative stress at a certain instant, and is subjected to positive stress at the next instant, and so on repeatedly. When the solution is subjected to negative pressure, an instantaneous vacuum will appear in the solution, and a cavity will appear, and the vapor and dissolved gas in the solution will enter into it and become bubbles. Immediately after the bubbles are formed, due to the action of positive pressure, the bubbles are ruptured and dispersed, and at the same time, a shock wave of thousands of atmospheres is generated around the cavity. Ultrasonic enhanced oil removal is to use the destructive effect of shock waves on the oil film and the strong stirring effect caused by cavitation.

Application of the second ultrasonic degreasing in chemical fiber knitted fabrics

In the spinning and weaving process of chemical fiber knitted fabrics, in order to make the production smoother, spinning oil and weaving oil are added to reduce the friction between the yarn and the machine. However, the oil on these grey fabrics will affect the subsequent printing and dyeing processing and must be removed.

Ultrasonic waves will have a significant reflection effect at different-phase interfaces with different densities, and the reflected sound pressure will also make the solution on the interface agitated violently, which plays a good role in "breaking" and refining, thus making the two different phases. Dissolved liquids (such as water and oil) are emulsified, and the dissolution of the solute is accelerated, so that the oil stains on the surface of the fabric and in the memory are peeled off and dispersed, forming small particles in an oil-in-water emulsification state. In addition to the spraying and overflow washing on the upper part of the machine, and then passing through the rolling mill (or vacuum suction), part of the oil is removed. Another part of the textile oil particles that have been taken away from the grey cloth and have formed an "oil-in-water" emulsified state is evaporated by the high-temperature setting of the setting machine, and brought into the exhaust gas purification device of the setting machine through the exhaust air for recycling, so as to achieve further oil removal. Purpose.