The mechanical cold extraction of oils using an expeller
is mainly used for fiber-rich sources with oil content above
20%, i.e., in the extraction of oil from copra, palm, peanut
and cotton, among others, aiming at a pre-extraction or the
preservation of compounds which might be degraded in the
solvent extraction process. But the expeller usually results
in the lower extraction yield than that obtained using
solvent extraction (10–18% of the oil)