three roll mill filter

The three-roll mill has proven to be the most successful of the range of roll mills which saw extensive development in the 19th century.

These included the single-roll mill and the five-roll mill. The single-roll mill works by material passing between the roll and a fixed bar pressing against the roll. The five-roll mill incorporates four successively smaller in-running nips and hence, compared to the three-roll mill, allows the use of larger agglomerates as part of the input material- but is correspondingly more complicated and expensive.