Nonwoven fabric is a kind of fabric made without spinning and weaving. It only requires directional or random arrangement of textile short fibers or filaments in order to form a fiber network structure, which is then reinforced by mechanical, thermal bonding or chemical methods. Nonwoven fabric breaks through the traditional textile principle and has the characteristics of short process flow, fast production speed, high yield, low cost, wide range of uses and wide source of raw materials. Because of its outer shape like pearls, it is also called pearl canvas.