1Material selection and treatment: remove the stalk leaves and the yellow and damaged leaves of fresh sweet potato shoot tips, cut and trim, drain, soak in 0.2% Na2SO3 color protection solution for 18-24 hours, rinse in clear water until the leaves are non-sticky. After the slippery feeling, the can is filled and the tank liquid of 80-90 ° C is injected. 2 Exhaust and seal: After filling at 80 °C, the tank is exhausted for 10 minutes and then sealed. 3 Sterilization, cooling: sterilization at 115 ° C for 3 minutes, rapid cooling to below 40 ° C, the sterilization formula is 5-3-5 minutes / 115 ° C. 4 Inspection and packaging: After removing the broken cans and expansion cans, samples are taken for sensory, physical and chemical and microbiological indicators. Safety Raincoat Reflective,High Visibility Raincoat,Safety Raingear,Class 3 Raincoat Ningbo Staneex Imp. & Exp. Co., Ltd. , https://www.staneex.com