Process flow: raw material selection → cleaning → lye treatment → green protection → Baobian → sterilization → packaging → finished product. Processing points: (1) raw material selection: selection of fresh, no dead leaves, disease-free leaves, no old root, plant shape of bitter herbs as raw materials. (2) Cleaning: The bitter herbs are dug out of the ground and there is a lot of dirt attached to them. They need to be carefully cleaned. Put it into a washing tank, detect dead leaves, debris, and foreign materials in the earth and stone, wash it thoroughly with flowing water, and then remove and drain the water. (3) Alkaline treatment: Soak the bitter for 10 minutes with a 1% sodium carbonate aqueous solution to neutralize some of the organic acids in the bitter herbs; Second, remove the wax from the middle leaves of the bitter herbs, which is conducive to the penetration of copper, zinc ions, etc. Within the bitter vegetable; three can protect the green. After treatment, the residual lye can be washed off with fresh water. (4) Protecting the green: It is prepared with 200 mg/L copper acetate, 200 mg/L zinc acetate, and 200 mg/L sodium carbonate, and maintained at a vacuum of 0.09 MPa for 15 minutes to enter the green protection process. After processing, remove and rinse with clean water. (5) Keep crisp: Soak the bitter with 0.1% calcium chloride solution for 10 minutes. Calcium penetrates into the bitter herbs and acts with the pectic acid therein to form calcium pectate. This salt has a gelling effect, which can bond in the intercellular space to increase the connection between cells, thus making the bitter herbs brittle and hard. . (6) Sterilization: soaking in 0.05% sodium benzoate solution for 30 minutes to avoid high temperature sterilization and softening the product. (7) vacuum packaging: using drawing nylon / polyethylene composite bag vacuum packaging. Related links: bitter herbs, belonging to the chrysanthemum family Chicory, commonly known as Sonchus, bitter leeks and so on. Its nature is bitterly cold, its main function is heat, cooling, detoxification. Bitter herbs is a kind of wild vegetable, non-polluting, unique in taste, rich in nutrition and popular among consumers. The following describes the processing techniques of two bitter herbs. Goggle,Breathable Safety Goggle,,Protective Disposable Goggle Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com