Generally speaking, there are 3 types of polyester staple fiber in the market: large chemical fiber, medium chemical fiber and small chemical fiber.
Large chemical fiber: short fibers made from PET chips or direct melt spinning. It has great color, large batch number, strong stability and few defects.
Medium chemical fiber: PET or PET material spinning. The price and quality is between big and small chemical fiber.
Small chemical fiber: use PET back spun. The price and quality parameters are not suitable for export to some markets and areas, where quality requirements are not too high (such as filling materials, etc.).