Polylactic Acid, also known as polypropylene glycol ester, is a polyester polymer obtained by polymerizing lactic acid as the main raw material, which is a new type of biodegradable material. PLA has good thermal stability, processing temperature of 170~230℃, good solvent resistance, and can be processed in various ways, such as extrusion, spinning, biaxial stretching, injection blow molding. In addition to biodegradability, products made from PLA have good biocompatibility, gloss, transparency, handfeel and heat resistance.