By simply passing the oil particles, which are dispersed and emulsified in the water as fine particles, through a filter, the tiny emulsified oil particles will be separated from the water!
The oil that has become an emulsion is a state of oil where oil particles have been refined due to ultrasonic waves or friction at sliding surfaces. Such oil cannot achieve a difference in specific gravity with water, resulting in an emulsion (emulsified) state without separating from water.
The oil removal filter adsorbs tiny oil particles that are in an emulsion state onto the surface of the filter fibers. Tiny oil particles continuously adhere to the fiber surface, gradually increasing in size, and once they exceed a certain size, they detach from the fiber surface due to the force of the water flow and flow out to the secondary side of the filter.
At this time, the oil particles that have flowed out are of a size greater than several micrometers in diameter, making them easily separable from water and resulting in floating oil particles. As a result, the oil particles that were in an emulsion state on the primary side of the filter are separated from water on the secondary side of the filter due to the difference in specific gravity with water.