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Prilog proučavanju mogućnosti racionalizacije tehnološkog postupka mlevenja pšenice primenom osmovaljne stolice / Study on the possibilities of the rationalization of wheat flour milling processusing the eight-roller mill

<p>U radu je proučavana mogućnost racionalizacije tehnolo&scaron;kog postupka<br />mlevenja p&scaron;enice primenom osmovaljne stolice u fazi mlevenja griza i<br />osevaka. Na svim ispitivanim prolazi&scaron;tima mlevenja griza i osevaka, pri istom<br />razmaku između valjaka i istoj veličini otvora sejnog tkiva za odsejavanje<br />bra&scaron;na, ukupan prinos bra&scaron;na u postupku sa osmovaljnom stolicom manji je<br />nego u klasičnom postupku. Pomenuta razlika varira u zavisnosti od uzorka i<br />prolazi&scaron;ta mlevenja, ali je uvek statistički značajna. Nižim vođenjem valjaka u<br />postupku sa osmovaljnom stolicom, u poređenju sa razmacima između valjaka<br />u klasičnom postupku, u zavisnosti od uzorka i prolazi&scaron;ta mlevenja se<br />smanjuje razlika, dostiže ili prevazilazi prinos bra&scaron;na u odnosu na klasični<br />postupak. Povećanjem veličine otvora sejnog tkiva za odsejavanje bra&scaron;na<br />značajno se povećava prinos bra&scaron;na u postupku sa osmovaljnom stolicom, pri<br />čemu se pri odabiru sejnog tkiva u obzir mora uzeti i veličina svetlog otvora.<br />Odabirom odgovarajuće veličine otvora sejnog tkiva može se i prevazići<br />prinos bra&scaron;na u klasičnom postupku. Niže vođenje valjaka i/ili povećanje<br />veličine otvora sejnog tkiva za odsejavanje bra&scaron;na, pri primeni osmovaljne<br />stolice, nema za posledicu pogor&scaron;anje kvaliteta bra&scaron;na (po pitanju sadržaja<br />pepela) u odnosu na klasični postupak. Specifični utro&scaron;ak energije za<br />usitnjavanje po jedinici mase bra&scaron;na, pri istom vođenju valjaka i istoj veličini<br />otvora sejnog tkiva za odsejavanje bra&scaron;na, veći je u postupku sa osmovaljnom<br />stolicom nego u klasičnom postupku. Povećanjem izvoda bra&scaron;na u postupku sa<br />osmovaljnom stolicom, značajno se smanjuje specifični utro&scaron;ak energije za<br />usitnjavanje. Mogućnost ostvarenja bliskih efekata usitnjavanja u fazi<br />mlevenja griza i osevaka, u klasičnom i postupku sa osmovaljnom stolicom,<br />ukazuje da je za dalju racionalizaciju savremenog tehnolo&scaron;kog postupka<br />mlevenja p&scaron;enice neophodno uključivanje osmovaljne stolice.</p> / <p>Rationalization of the wheat flour milling process using the eight-roller mill in<br />the reduction system has been investigated. At the same roll gaps and same<br />sieving conditions, a lower flour yield has been obtained using an eight-roller<br />mill compared to a conventional one. The difference is statistically significant<br />regardless the passage. By decreasing the roll gap in the process with the<br />eight-roller mill, compared to the roll gap in the conventional process, it is<br />possible to decrease the difference, obtain a similar or even exceed the flour<br />release in the conventional system. Increasing the size of the screen aperture<br />for sifting flour, while percent open area of the screen also needs to be<br />observed, results in significant increase of flour yield (in some cases<br />exceeding the flour yield in the conventional system). Adjustments of the roll<br />gap and sieving conditions in the process with the eight-roller mill are not<br />followed by deterioration of flour quality. At the same roll gaps and same<br />sieving conditions, energy requirements for grinding are higher in the process<br />with the eight-roller mill compared to a conventional system. With the<br />increase of the flour release in process using the eight-roller mill, these energy<br />requirements can be significantly reduced. The possibility of achieving similar<br />milling results to those obtained in the conventional system, while the<br />investment costs and overall energy requirements are significantly lower,<br />justifies the use of the eight-roller mill in the reduction system of the wheat<br />flour milling process.</p>

Identiferoai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)71277
Date07 September 2009
CreatorsFišteš Aleksandar
ContributorsTanović Gavrilo, Pajin Biljana, Mastilović Jasna
PublisherUniverzitet u Novom Sadu, Tehnološki fakultet Novi Sad, University of Novi Sad, Faculty of Technology at Novi Sad
Source SetsUniversity of Novi Sad
LanguageSerbian
Detected LanguageUnknown
TypePhD thesis

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