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A general extrudate bulk density model for both twin-screw and single-screw extruder extrusion cooking processes


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Cheng, Hongyuan; Friis, Alan; Høeg Hansen, Jonas and Tolderlund Rasmussen, Hanne (2010) A general extrudate bulk density model for both twin-screw and single-screw extruder extrusion cooking processes. Journal of Food Engineering. [Submitted]

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Effects of extrusion parameters and raw materials on extrudate expansion are respectively investigated in a twin-screw extruder and a single-screw extruder extrusion cooking experiments for fish feed, wheat, and oat & wheat mixture processing. A new phenomenological model is proposed to correlated extrudate bulk density, extrusion parameters and raw material changes based on the experimental results. The average absolute deviation (AAD) of the correlation is 2.2% for fish feed extrusion in the twin-screw extrusion process. For the single-screw extrusion process, the correlation AAD is respectively 3.03%, 5.14% for wheat and oat & wheat mixture extrusion; and the correlation AAD is 6.6% for raw material change effects. The correlation results demonstrate that the proposed equation can be used to calculate extrudate bulk density for both the twin-screw extruder and the single-screw extruder extrusion cooking processes.

Summary translation

Effekter af extruderings parametre og råmateriale på extrudat ekspansion er undersøgt i henholdsvis i en dobbeltsnekke og en enkeltsnekke ekstruder for fiskefoder, hvede, rug/hvede. Den opstillede model vist sig praktisk brugbar til beregning af ekstrudatdensitet for begge typer ekstrudere.

EPrint Type:Journal paper
Keywords:extrusion; expansion; model; fish feed; wheat
Subjects: Values, standards and certification > Assessment of impacts and risks
Research affiliation: Denmark > DARCOF III (2005-2010) > ORAQUA - Organic fish production
Denmark > DTU - Technical University of Denmark
Deposited By: Jokumsen, Senior Advisory Scientist Alfred
ID Code:18204
Deposited On:13 Jan 2011 14:42
Last Modified:13 Jan 2011 14:42
Document Language:English
Refereed:Submitted for peer-review but not yet accepted

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