RunDry™ Maximum power with minimum water
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Water to papermaking is like air for human life. Without water making paper is not possible, or at least it is very difficult. Conversely, too much water in the paper sheet causes low dryness and higher energy consumption in the drying section. Additional problems might be too many breaks, high draws, foreign deposits, and bad profiles. Maximizing dryness after the wire section and press sections improves paper machine efficiency and reduces the dryer section energy consumption.
High speed paper machines generally have mechanical doctoring for the press section nip rolls. Slower machines producing board, liner board or fluting grades generally have high felt dewatering with very little water coming from the nip, hence save-alls or doctors are not needed.
Today, it is widely accepted that nip dewatering is the most efficient and economical way of removing water at the press section. However, in order to get the full benefit from nip dewatering doctoring, the press section doctoring and save-alls need to be properly designed to handle the increased water loads. It’s also very important for the press nip rolls to have high void volumes to facilitate the higher water load and enable that water to be removed from the roll grooves and holes.
Energy efficiency can be simply acheived by installing RunDryTM. The RunDryTM process has been created to maximize dewatering at the press section and maintain the lowest possible energy consumption. In most cases RunDryTM allows customers to run felts without a uhle box.
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