The purpose of the reported study was to isolate, identify, and control the deposits formed on a fourdrinier wire during the manufacture of fine paper grades. Analysis of the wire deposit indicated that alumina (41%), sulfate ion (11%), and rosin (11-14%) were its major components. The relationships between alum concentration, pH, and temperature and the effect of these variables on deposit formation were studied. Alum concentration is the governing factor in deposit formation. Reducing the alum level and avoiding pH variations and pH shocks in the system are recommended. An operating temperature below 90 degree F also helps to prevent deposit formation.
