Abstract
The present invention provides a method making stratified paper by redistributing the
pulp suspension inside the
headbox nozzle using acoustic radiation waves. Acoustic radiation forces fractionate fibers based on fiber radius. The acoustic radiation waves separate the fibers by pushing the coarse and longer
fibers to the inner area while fines and smaller fibers remain in the outer area. This has a similar effect of multi-layer stratification headbox, and provides paper with a smoother surface.
Inventors: Park; Chang Shin (San Diego, CA); Xu; Hanjian (Middletown, NY)
Assignee: International Paper Company (Stamford, CT)
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