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Suction rolls have four major components. One, a roll shell with through drilled holes. Two, one or more suction boxes or vacuum boxes. Three, a head and journal at each end. And four, a roll cover on the shell. Suction roll shells are typically constructed of bronze or stainless steel. Holes are drilled through the shell to supply vacuum to the roll's surface. The hole pattern influences the strength of the shell. The amount of noise generated and the amount of open area available. The suction press roll shell is the primary interface for applying pressure to the sheet in the nip. It is designed to handle high nip loads and withstand repeated cycles of loading and unloading.