Technology and Squeezing Parameters Optimization of Low-temperature and Cold-pressed Extraction of Walnut Oil

In order to obtain high quality walnut oil，pilot experiment of shell breaking，separation and low temperature screw cold-pressed technology was carried out by taking“Xinxin 2”as research object.Effect of material granularity on oil yield，and effect of squeezing parameters（outlet diameter and pressing shaft speed）of cold-pressed extraction technology on residual oil rate and crushing efficiency were studied，optimum process conditions were obtained as：walnut kernel grain size was 10 mm，pressing temperature was 35 ℃，squeeze moisture content was 8%，pressing shaft speed was 60 r/min and outlet diameter was 6 mm，oil extraction rate could reach 40% at optimum process conditions.Integrate cold pressed device with walnut shell breaking and shell kernel separation production line，that form a low-temperature and cold-pressed walnut oil production line，which could provide a solid foundation for industrial production of cold pressing walnut oil.