Optimization of vacuum coating conditions to improve oil retention in trout feed

Asma Chaabani (1, 2) , Laurent Labonne (2) , Carlos Alburez Tercero (2) , Jean-Pierre Picard (3) , Catherine Advenier (3) , Vanessa Durrieu (2) , Antoine Rouilly (2) , Fabien Skiba (1) , Philippe Evon (2)

1 Nutricia (FRANCE)
2 CAI - Chimie Agro-Industrielle
3 Aqualia (FRANCE)

This work describes a process approach to study the oil leakage phenomenon in feeds for large Trout. Using a pilot vacuum coater, four experimental coating parameters were studied (stirring speed, pressure, filling rate, and time needed to restore atmospheric pressure) through an experimental design. The properties measured on the coated pellets were the oil leakage rate and three other important usage properties, i.e. durability, hardness, and floatability. The coating conditions had a significant influence on oil leakage rate, varying at 40 °C from 2.7 % to 1.2 % depending on the coating conditions used. Finally, the vacuum level was the most effective factor in reducing leakage. Indeed, a progressive reduction in oil leakage rate was observed as the pressure inside the coater was reduced during coating.

Mots clés: Extruded fish feed Vacuum coater; High fat content; Oil leakage rate; Vacuum level

Domaines: Alimentation et Nutrition; Ingénierie des aliments; Science des productions animales; Mécanique des matériaux [physics.class-ph]

Asma Chaabani, Laurent Labonne, Carlos Alburez Tercero, Jean-Pierre Picard, Catherine Advenier, et al.. Optimization of vacuum coating conditions to improve oil retention in trout feed. Aquacultural Engineering, 2020, 91, pp.1-14. ⟨10.1016/j.aquaeng.2020.102127!⟩. ⟨hal-02968045⟩