Mini-Encyclopedia of Papermaking Wet-End
Part Three: Equipment & Unit Operations
Fourdrinier machines may be modified with the addition of a top-wire dewatering unit, making it possible to produce a sheet with greater symmetry and much better dewatering. The next further step in sophistication is to place a headbox and dewatering elements on the top unit, making it into another Fourdrinier former. The two sheets are joined together when the forming fabrics come together. Some paper machines are set up with separate stock systems for different headboxes, making it possible to use premium fibers or other materials in a top ply.
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