Polypropylene resin is the main raw material for woven pp bag.It is firstly extruded ,stretched into flat fiber ,and the flat fiber is weaved into fabric .Then the fabric is sewn into pp bags. The printing of these kinds of bags can be common or multi-colored. Woven pp bags are extensively used by people ,especially in industry. It is mainly used for packing various products like fertilizer, rice, oresand, feed,fodder and so on with the advantage of environmental protection.