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Polylactic acid (PLA) is a new type of biodegradable material. It is made from starch extracted from renewable plant resources such as corn. The starch is made into lactic acid by fermentation, and then converted into polylactic acid by chemical chorus. It has good biodegradability and can be completely degraded by natural microorganisms after use, and finally produce CO2 and water, which does not pollute the environment It is very beneficial to the protection of the environment and is recognized as an environmentally friendly material.