Mini-Encyclopedia of Papermaking Wet-End
Part Three: Equipment & Unit Operations
The function of a stuff box is to provide a constant head of thick-stock furnish to be metered into the fan pump. It is critical that the thick-stock valve always perform with high accuracy and predictability. As shown in the picture, an excess of stock from a machine chest is pumped upwards into the base of a stuff box. Part of the flow passes over a weir and drops by gravity through pipes leading back to the machine chest. Another part of the flow satisfies the demand of the thick-stock valve and fan pump. Because of its easy accessibility, the stuff box is often used as the addition point for chemicals.
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