Valve bags, also known as spout pouches, are filled from the top or bottom spout using specialized filling equipment. After filling, they automatically form a rectangular shape, offering efficient filling, neat stacking, and convenient transportation. They are widely used for packaging powdery or granular solid materials and flexible items in industries such as powders, chemicals, synthetic materials, pharmaceuticals, and minerals. Extra-large valve bags are commonly used in the meteorological silica industry and for packaging ultra-fine nano-scale powders. They represent a currently mainstream, environmentally friendly packaging solution for powders internationally.

Valve bags, also known as spout pouches, are filled from the top or bottom spout using specialized filling equipment. After filling, they automatically form a rectangular shape, offering efficient filling, neat stacking, and convenient transportation. They are widely used for packaging powdery or granular solid materials and flexible items in industries such as powders, chemicals, synthetic materials, pharmaceuticals, and minerals. Extra-large valve bags are widely used in the packaging of meteorological silica and ultra-fine nano-powders. They are currently the mainstream environmentally friendly packaging bags for powders internationally.