Polyester fiber is a synthetic fiber. Due to its low price and excellent mechanical properties, it has the highest output and consumption rate among natural fibers and synthetic fibers. These fibers have higher resistance to wrinkles, abrasion and heat while being less absorbent, making them easier to wash and wear, but less comfortable. Polyester fibers are used in the form of filaments and short fibers, either alone or in combination with other fibers. Polyester fibers are mainly combined with hydrophilic fibers in order to obtain products with high comfort and good mechanical properties at an economical price. Due to polyester's mechanical and chemical strength, these fibers have a wide range of applications, from tents and umbrellas to scarves and uniforms. Polyester fibers are spun through a melt spinning process that allows the fibers to be manufactured in different shapes and sizes depending on specific applications. Polyester staple fiber is mainly spun by ring spinning. Polyester microfibers are extremely fine fibers with a cross-sectional diameter less than 10 microns. The fineness of these fibers is similar to silk fibers in appearance and has a fine feel and drape, but dyeing these fibers into dark shades is problematic