... /m2 4.Air permeability:13500-21500 m3/m2 Polyester Spiral Dryer FabricsAccording to Finland standard with first-class monofilament, ... which makes the polyester spiral fabric, has the characteristic of stable property and long ... cardboard, Kraft paper, corrugated paper, paper for train fare, single two-shed press-filter, replacing papermaking machine dry blanket, ...