For the oil extraction, the seed is purified to a purity of at least 98%. Unwanted accompanying material (e.g. straw residues) and incompletely developed seeds can be separated by sieving, air classification or table separator from the seed flow.
With a continuously operating magnetic separator can be removed magnetic iron particles.
The gleaning of oily debris after the sunflower peeling process can be done by a vibrating sieve (decks are modular). In this case, up to 3% oil-containing fraction are obtained.
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