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.
Request from the webmaster: Our goals include brevity and accuracy. Hopefully we have succeeded with the first goal without sacrificing the second. Please let us know right away if you find an error or omission. Also, please indicate points that need a clearer description.
RETURN TO INDEX PAGE OF ENCYCLOPEDIA
This page is maintained by Martin hubbe, Associate Professor of Wood and Paper Science, NC State University, email@example.com .