In the production of non-woven fabrics, there is no impurity removal process for polyester staple fiber. Therefore, the defects in polyester staple fiber will be directly brought into the non-woven fabric, resulting in uneven webs, and in severe cases, hard spots on the fabrics will occur, thereby affecting Leather fabric coating process. If the polyester staple fiber used in medical or OEI nonwovens contains dirty silk or tail silk impurities, the impact is even more severe, and it may even cause the entire batch to be scrapped. Therefore, the production of spunlaced nonwovens requires that the content of the deuterium impurities in the polyester staple fiber be as low as possible, and it is desirable to achieve zero defects.

In order to ensure the quality of leather spunlace nonwoven fabric products, it is necessary to stabilize the shrinkage of polyester staple fiber in the heat treatment process. Therefore, polyester staple fibers are required to have a stable dry heat shrinkage.

For polyester staple fiber of non-woven fabrics for medical and medical use, the oils attached to the fibers must meet the hygienic and safety requirements.