During the last fifteen years, membrane technology in the world dairy industry has been developed so much that 100, 000m2 area of UF membrane is used nowadays.
The main reason of this development is due to the worldwide whey problem. Also, UF cheese production by the MMV method has been successfully industrialized.
In this paper the membrane technology was birds-eye-viewed in a chart and its structure was diagrammed. According to this diagram UF and RO were reviewed. And a Japanese milk products company's whey problem and involvement in membrane technology were briefly intro-duced.
