Research and application of twin-screw press for cold pressing of de-hulled rapeseed

Li Wenlin~1,Huang Fenghong~1,Gu Qianghua~2,Gan Weirui~2(1.Oil Crops Research Institute,Chinese Academy of Agricultural Sciences,Wuhan 430062,China;2.Wuhan Lianglong Machine Manufacture Co.,Ltd.,Wuhan 430000,China)

twin-screw press;double-low rapeseed;de-hulling;cold pressing;equipment

In order to solve the technical problems of cold pressing of de-hulled double-low rapeseed,a new twin-screw press with a principle of combination of joggling and non-joggling was designed and manufactured,the pressing chamber of which had characteristics of multiple-stage compression and relaxation and a thin layer of(materials) when pressing.Theoretical compressing ratio of the twin-screw press is 23.0,and ratio of length and diameter of pressing chamber is 11.5,and pressing time is 180 seconds.In the twin-screw press materials could be cleaned up intensely so that the problem of de-hulled rapeseed feeding was solved.The twin-screw press was applied to cold pressing of de-hulled rapeseed successfully.The oil content of cold pressing cake is reduced to about 15%.Cold pressing oil approaches the Standard of National Ⅲ Rapeseed pressing Oil.Cold pressing cake temperature is lower than 70℃ which assures good quality of cold pressing oil and cake.Twin-screw press is fit for the cold pressing of de-hulled rapeseed with obvious improvement of quality of rapeseed oil and reduction of energy consumption,which can increase processing value of double-low rapeseed.