Valve Bags

Valve bagging is when a bag is filled using a specialized machine. The machine uses a spout placed in or near the opening of the bag.
Bags would form itself into a rectangle during the filling process.
The benefits of this bag are you can be filled and closed per hour and the package is neat and tidy to palletizing or storage, even it makes the stable stacking on the pallets and it's safer for transportation.

Valve bag is widely applied to cement, mineral powder, food grade powder ,chemical powder and construction material etc.