Characterization of retention and drainage aids Optimized lab retention measurement allows fast and reliable conclusions for the process. Increasing productivity is a critical success factor for a paper mill. Productivity is strongly connected with how quickly water can be removed from the fiber suspension while retaining a maximum amount of fines and fillers. To pursue this goal papermakers rely on new technologies and chemical additives such as retention and drainage aids. Most of these are high-molecular, charged polymers which support flocculation and bonding of fines and fillers to the fiber. Retention and drainage aids need to be adjusted specifically to the paper machine onsite and the raw materials used. In order to select the right products, preliminary tests in the laborator

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