Permitted Variations in Flatness of Plate Mill Plate .
A typical layout of a mill using the kraft chemical pulping process is shown in figure 2-1. Mechanical, semichemical, and sulfite pulp mills differ in detail, particularly in wood preparation, fiber separation, and bleaching, but many of the downstream refining, bleaching, and papermaking processes are similar.Use hot rolled steel (HRS) when cost is more important than surface finish. Hot rolled sheet should be punched instead of cut on the laser, as the mill scale affects the quality of the cut. Hot rolled sheet can be formed easily. If painted, any mill scale or pits will show through the paint, resulting in a rough finish.