Paper Machine Suction Rolls and Roll Covers

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Though their design and construction are very similar, suction rolls perform several different functions on paper machines, depending on their position. They can be used to remove water from the sheet, transfer the sheet, improve dewatering in a press nip, dewater a felt, stabilize the sheet, or pull steam into the sheet. Roll cover selection should take into account the functions of the roll and the operating conditions.

Learning objectives for this course are:

• The purpose of suction rolls in the forming and press sections of a paper or board machine
• The function of key components of a suction roll
• The importance of proper vacuum box and end deckle positioning in suction rolls
• The various types of roll cover materials and their typical applications
• The benefits of grooved and blind-drilled roll covers