PLA, also known as polylactic acid fiber, has excellent drapiness, smoothness, moisture absorption, natural antibacterial activity and skin soothing weak acidity, good heat resistance and UV resistance linearity. This kind of fiber does not use chemical raw materials such as petroleum, and its waste can be decomposed into water and carbon dioxide under the action of microorganisms in soil and sea water, which will not pollute the earth's environment and meet the requirements of sustainable development of the international community. Therefore, it is widely valued by the international textile industry for biodegradable self-adhesive bags, biodegradable zipper bags, biodegradable bags, biodegradable bags, biodegradable waste bags, biodegradable non-woven fabrics (food packaging, seasoning bags, tea bags, masks, facial masks, surgical tablecloths, disposable surgical gowns, sanitary napkins, dust bags, desert tree bags, filter cloth), etc.