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Glasnik Zaštite Bilja, Vol. 44. No. 3., 2021.

Review article

https://doi.org/10.31727/gzb.44.3.9

Equipment for cold pressing of oil on family farms

Tomaž Poje ; Kmetijski inštitut Slovenije, Ljubljana, Slovenija

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Abstract

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.

Keywords

cold pressing of oil; oilseeds; screw press; oil temperature; press performance

Hrčak ID:

257082

URI

https://hrcak.srce.hr/257082

Publication date:

7.5.2021.

Article data in other languages: croatian

Visits: 763 *

License (open-access, http://creativecommons.org/licenses/by/2.5/):

Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

License (open-access):

Ovo je članak s otvorenim pristupom distribuiran pod uvjetima licence Creative Commons Attribution, koji dopušta neograničenu upotrebu, distribuciju i reprodukciju u bilo kojem mediju, pod uvjetom da se izvorno djelo pravilno citira.

License (open-access):

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Date received: 23 February 2021

Date accepted: 20 April 2021

Publication date: 14 June 2021

Volume: 44

Issue: 3

Pages: 74-81

DOI: 10.31727/gzb.44.3.9

Article Information (continued)

Categories:

Subject: Pregledni rad

Categories:

Subject: Review-article

Keywords:

Keyword: hladno prešanje ulja

Keyword: uljarice

Keyword: vijčana preša

Keyword: temperatura ulja

Keyword: učinak preše

Keywords:

Keyword: cold pressing of oil

Keyword: oilseeds

Keyword: screw press

Keyword: oil temperature

Keyword: press performance

Oprema za hladno prešanje ulja na obiteljskim poljoprivrednim gospodarstvima

Translated Title (en): Equipment for cold pressing of oil on family farms

Tomaž Poje[1]

Email: tomaz.poje@kis.si

 

[1] Kmetijski inštitut Slovenije, Ljubljana, Slovenija

Abstract

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.

Translated Abstract

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.

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