The “Up’s and Down’s of the Pulp & Paper Industry” deals with the design, fabrication, and installation elements of upflow and downflow bleach (retention) towers utilized in the Pulp & Paper industry. Fabrication processes for the shop and field components of these systems are reviewed. In addition, an overview of the advantages of Fiberglass Reinforced Plastics (FRP), considering the changing chemistries for pulp bleaching is presented, and a number of case histories are reviewed.
Keywords: upflow, downflow, bleaching tower, retention tower, pulp & paper, FRP, composites, pulp bleaching