Its versatility in blending is one of the unique advantage of polyester. The polyester have probably undergone more research and development work than any other fiber. One of the important physical changes has been that of changing from the standard round shape to a trilobal cross-section that gives the fiber silk-like properties. A chemical modification, high tenacity staple, was developed for use in durable press fabrics. The strength of the polyester reinforces the cotton fibers, which are weakened by the finishing process.
Based on the picking operations looms are divided into various categories. The two major ones are based upon the method of filling insertion. Looms that uses shuttle are called conventional shuttle or fly shuttle looms. Shuttle looms have very compact selvedge.