Hongxiangjiao apples are picked in suitable time and irradiated by 60Co-γ rays 0.5 kGy,dose rate not more than 10 Gy/min. Under the circumstances that the tempreture is0-5℃,humidity is 85-95%,they are stored in packing box which has nonpoisonous polyethylene plastics inside for 6 months. There are no notable changes on their hardness,major nutrient content,colour,smell,tastes and appearance.
The results indicated that the acceleration in packing box and between box layers increased not only from the bottom to top but also greater than that of the vibration table,when the frequency was 2 Hz and the acceleration above 1.0×9.8 m/s 2.The middle layer damage volume in packing box was more serious than that of the bottom and the bottom still more than that of the top.
According to experience of other plants, oil wiper, seal air pressure for piston rod, air valve and packing box in 4M8-62. 5/32 type oxygen compressor were re- formed. Thus, it guarantees safty operation of the unit. The oxygen compressor is matched with 6000m3～/h oxygen making machine.