Equipment for cold pressing of oil on family farms

Iz uljarica hladnim prešanjem dobijemo uljanu pogaču i visoko kvalitetno ulje. Ulje se upotrebljava za ljudsku prehranu, ali i za kozmetiku te za ljekovite namjene. Uljna pogača najviše se upotrebljava za ishranu stoke, ali se konzumira i u ljudskoj ishrani. Za prešanje se najčešće upotrebljavaju vijčane preše s pogonom na elektromotor. Kod vijčanih preša može se podešavati broj okretaja vijaka, promjer mlaznice i udaljenost kompresijske glave od vijka. Kod prešanja zbog trenja nastaje i toplina. Ona mora biti što niža, da se održi kvaliteta ulja. Granična temperatura kod hladnog prešanja nije zakonski određena ni u Sloveniji, ni u Hrvatskoj. Potrebna električna snaga povećava se s povećanjem brzine vijka. Također je potrebna veća električna snaga za prešanje sjemena s mlaznicom manjeg promjera.From cold press oilseeds, high quality oil and oil cake are produced. Cold pressed oil is used for human consumption, for cosmetics or for medicinal purposes. Oil cake is mostly used for feeding cattle and some people consume it as well. For cold pressing screw presses with electric motor drive are mostly used, where the number of revolutions of the screws, the diameter of the nozzle and the distance of the compression head from the screw can be adjusted. The required electrical power increases with increasing screw speed. Higher electrical power is also required to press the seeds with a nozzle of smaller diameter. Heat is also generated when pressing due to friction. The temperature of oil must be as low as possible to maintain the quality, but the limit temperature for cold pressing has not yet been legally determined in Slovenia or Croatia