Rows of metal discs or plates are dipped into the paste. The oil preferentially wets and sticks to the metal and is removed with scrapers in a continuous process.
- higher polyphenol content of oil
- low temperature method
- low labor
- oil/water separation step unnecessary
- low energy requirement
- often must be combined with one of the above methods to
maximize oil extraction which requires more space, labor, etc.
- large surface areas can lead to rapid oxidation
Sale of future machines are currently outlawed in European Union due to difficulty in cleaning such large surface areas.