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This Technical Information Paper provides guidelines for design of paper machine headbox approach pipingbetween the machine chest discharge and the headbox. The approach system has a significant influence onuniformity of the final sheet of paper. The goal of this TIP was to compile information on current approach pipingguidelines from machine builders, other equipment suppliers, design engineers, and paper company representatives.The purpose is to provide design guidelines that paper companies can use to minimize residual machine directionbasis weight variation on paper machines. The guidelines were developed for paper machines operatingconventional headboxes. Changes may be required for application on machines operating at low ( < 0.2%) or high( > 2.0%) headbox consistency.

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Published: 2012 Number of Pages: 36