Production of Unrefined Walnut Oil

Nerafinirano orahovo ulje dobivamo postupkom prešanja uz prethodno kondicioniranje samljevenog oraha. Proces proizvodnje se sastoji od nekoliko faza: ljuštenje, čišćenje, sušenje, mljevenje, kondicioniranje. Sušenjem se odstranjuje dio vode zbog čega se osušeni plod može duže čuvati, a osim toga se bolje prerađuje. Tako prethodno obrađena sirovina se zatim melje da bi se razorile biljne stanice i time se povećala površina kojom se vrši izdvajanje ulja tijekom prešanja. Prešanjem, odnosno primjenom visokog tlaka izdvajamo ulje iz oraha, nakon čega sirovo ulje ide na bistrenje da bi se izdvojile sve nečistoće koje dospiju u ulje tijekom prešanja. Skladištenje ulja i samo punjenje u ambalažu treba provest pažljivo jer je orahovo ulje zbog velikog sadržaja nezasićenih masnih kiselina izuzetno osjetljivo na oksidacijsko kvarenje.Unrefined walnut oil is produced by pressing with previously grinded walnut. Production process consists of several phases: peeling, cleaning, drying and storage of walnuts before further processing. Drying removes water so dryed walnut may last longer, furthermore dryed walnut have better processing performance. Raw materials processed in such way are then ground in order to destroy cells and increase the surface that is used for oil extraction during pressing. By applying high pressure oil is extracted from the walnut, after that oil requires clarification so all the dirts that get into the oil during pressing can be segregated. Oil storage and filling in the wraping material must be conducted carefully due to walnut oil extreme sensitivity to oxidation caused by the great content of unsaturated fatty acid