Effect of preconditioner operating parameters on the physical and chimical quality of extruded fish pellets [electronic resource].

Includes references.

The purpose of this study was to identify physicochemical properties of preconditioner process with impact on extruder productivity, energy requirements, bulk density, total protein and pellet durability. The extruder machine was used under the different levels of temperature (control (without steam), 100, 110 and 120°C), feeding rate (114, 228, 342 and 456 kg/hr.) and compression room (distance between die and screw) (I, 1 ,5, 2 and 2,5 em) Using constant values of die hole diameter of 4 mm, average ration moisture content of 30% (w.b). The evaluation included extruder productivity, energy requirements, pellets quality (durability, bulk density) and total protein. The obtained data showed that, the highest values of extruder productivity of 465.5 kg/hr., lowest energy requirements of 36.29 kW.hr./Mg, were recorded in the case of 120°C of steam temperature, 2 em compression room, 456 kg/hr., feeding rate, but the highest values of pellets bulk density (768.81 kg/m3 ) was recorded in the case of 120°C steam temperature, 2cm compression room and 114 kg/hr., feeding rate. The highest values of durability (97.75%) was recorded in the case of control, 2 em compression room (distance between die an screw), 114 kg/hr., feeding rate and !20°C steam temperature. Inclusions of preconditioner improved productivity, durability, bulk density significantly, no effect on extruded total protein and the positive effect was evident at both extrusion temperatures. Pellets extruded at the highest temperature and feeding rate 120°c and 456kg/hr., respectively, showed significant lower energy requirements and high extruder productivity.

Summary in Arabic.

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