This series of machines are designed for packing high air content, low bulk density and super fine to nanophase powdery materials into valve bags, the advantage is no dust leaking and protection of the environment. The packaging process can achieve high compression ratio when filling materials, the finished packaging bag has plump shape and smaller size, the packaging effect is particularly outstanding. Representative materials are Silica Powder, Carbon Black, White Carbon Black, Superconducting Carbon Black, Active Carbon in Powder, Stearate, Graphite, and etc. http://www.puda-en.com