Addition Points

The addition points of various chemicals should be analyzed from time to time to see if there are better places to add the chemicals. For example, new defoamers may be available that are less detrimental to sheet properties, but have a lower retention time. Thus, the defoamer should be added closer to the are where foam is an issue. Any chemical can be moved to improve efficiency. Optical brightening agents (OBA) or fluorescent whitening agents (FWA) may be added in more places to increase whiteness. Here's a hint look to add OBA's and FWA's further back in the system, think way back. For acid paper look at places where acid can be added to improve drainage. Too much acid will damage fiber and possibly machine clothing. Alum is another chemical that can be moved around. I was able to reduce alum usage by simply moving the addition point. Moving addition points can be easy. Setup some temporary lines and run some simple trials.