Due to the development of microbiological technology, there are several biodegradable plastics in the world, and polylactic acid is more and more popular among them. Because polylactic acid plants will not deplete natural resources, non-woven producers are more interested in developing new products with this raw material. All kinds of nonwoven fabrics made of polylactic acid are biodegradable, and some blend polylactic acid with other natural fibers or rayon fibers to make the final product biodegradable.   
Due to the development of microbiological technology, there are several biodegradable plastics in the world, and polylactic acid is more and more popular among them. Because polylactic acid plants will not deplete natural resources, non-woven producers are more interested in developing new products with this raw material. All kinds of nonwoven fabrics made of polylactic acid are biodegradable, and some blend polylactic acid with other natural fibers or rayon fibers to make the final product biodegradable.  
Polylactic acid film cloth is a new biological material, soft, strong absorbent, moisturizing and breathable, bacteriostasis, is a kind of pure, safe, healthy, close to the skin of high quality materials, with other materials unparalleled many biological characteristics, is the ideal base material of high quality mask. Polylactic acid and polylactic acid fiber are natural antibacterial, anti mite, pH value close to the skin value, known as the second layer of skin. (SGS test data). Polylactic acid can support the normal growth of skin fibroblasts, and is used as a cell culture substrate in skin tissue engineering in medical field. (China Academic Journal online publication database, 2002 22).  
Polylactic acid can be implanted into the human body and absorbed by the human body. It has been applied in the medical field for nearly 30 years. Polylactic acid fiber is used in the substrate of the mask, which separates some free small molecules, and the small molecule has strong permeability. After combining with the lactic acid substance of the skin itself, it can not only bacteriostasis, but also improve the absorption of nutrient solution and enhance the growth vitality of facial skin. At the same time, the polylactic acid film fabric has a very good water absorption performance, can store more essence, and has strong adsorption performance, can better adsorb oil and remove impurities, so that the facial skin to reach a deeper level of cleaning. The porous structure of the polylactic acid membrane can let air and water vapor permeate, fully retain the active factor in the essence, moisturize the effect well, the essence is not easy to dry or volatilize, prolong the skin absorption time, can promote the product effect.  
At present, Japan polylactide non-woven manufacturers only Shintec and Younitika two. The use of polylactic acid to produce hot sticky needled nonwovens is more widely used. Only Ma On Shan and Jay good company have developed diapers, sanitary napkins, polylactic acid fiber and so on, without any added ingredients, material natural bacteriostasis, anti mites.  
 
(the above comes from Baidu Encyclopedia)