Wet pressing and product quality: Review of previous pilot machine trials, TAPPI Journal July 2020

Application: This paper describes how wet pressing affects the printability of paper. This information can be used to optimize existing press sections, understand the impact of press felt design, and to improve future press section design.

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Author: J. David McDonald
Wet pressing and product quality: Review of previous pilot m
ABSTRACT: The purpose of wet pressing is to remove water by mechanical means to consolidate the web and minimize the energy expended in the dryer section. In this process, paper is compacted and densified to degrees that impact end-use performance. Average density is increased by pressing, which has implications for grades where stiffness is important. The z-direction density gradients can affect printing and converting. Lastly, pressing affects surface quality of paper and its response to printing. Broadly speaking, the final press nip dominates the paper surface roughness and the early press nips affect printing performance.

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