Equipped with outer vacuum structure. There is a pair of corrugated rollers to make a paper sheet into one corrugated paper, the Equipped ... with outer vacuum structure. There is a pair of corrugated rollers to make a paper sheet into one corrugated paper, then ... pairs of corrugating rollers to make.Flute Type: UV, flutes A,B, C ,BC,D,E , one of them can be selected ...