挤压加工对脱壳菜籽油脂品质的影响

Study on the Influence of Extrusion Processing on Properties of Rapeseed Oil

研究了脱壳油菜籽挤压系统参数(套筒温度、螺杆转速、螺头至模板距离、模孔长度、模孔孔径)对从榨笼中挤压出的菜籽油的游离脂肪酸、碘值和油脂稳定性的影响规律。结果表明:挤压系统参数对脱壳菜籽油的游离脂肪酸及油脂稳定性的影响较大,对油脂碘值影响较小。比较了传统压榨菜籽油、挤压不脱壳菜籽油、挤压脱壳菜籽油的游离脂肪酸、碘值和油脂稳定性,结果显示:从榨笼挤出的脱壳菜籽油的游离脂肪酸及油脂稳定性都好于传统压榨油和不脱壳挤压油。

The influence regularity of the parameters of rapeseed extrusion system on free fat acid, iodine value and stability of rapeseed oil extruded from extract cage of extruder was studied. The parameters included those of barrel temperature, screw speed, distance between the end of screw and the inner surface of die, length and diameter of nozzle. The test results indicated that the influence of parameters of rapeseed extrusion system on free fat acid and stability of rapeseed oil is bigger, but the influence of parameters of rapeseed extrusion system on iodine value is smaller. The oil of extruded rapeseed dehulled was contrasted with that of traditional rapeseed pressed and extruded rapeseed with hull. It pointed out that the stability of rapeseed oil extruded dehulled is better than that of traditional rapeseed pressed and extruded rapeseed with hull. It provided some reference for application the technology in production.