Spiral press filtrate fabrics Flat surface, not easily cracked Good air permeability We have won ISO9001:2000,SGS Spiral press filtrate fabrics Flat surface, not easily cracked Good air permeability We have won ISO9001:2000,SGSPress and filtrate fabrics by filling wad into the spiral fabrics to reduce the air permeability,so orifice change to compact,reduce matter running out from fabrics, ...