This procedure is used to define the papermaking quality of pulp, by subjecting it to a controlled mechanical treatment in a laboratory beater; see also TAPPI T 248 “Laboratory Beating of Pulp (PFI Mill Method).” The term beating denotes a specific type of refining, but is now commonly used to describe refining in a laboratory. This procedure is used by market pulp mills as a basis for product quality claims, in research studies, to evaluate new pulps, and to provide a basis for process control when using variable pulp sources. The beating procedure may be used with any pulp, suitably modifying the withdrawal schedule to provide the number of samples required for a satisfactory beater curve. The method may not give satisfactory results with certain extremely long-fibered pulps, such as cotton fibers or jute since the fibers entangle and tend to rope in the beater.

 

The amount of sample need to perform the beating procedure is the equivalent of 390 grams of oven-dried pulp. This sample size should enable the pulp to be refined at a minimum of four freeness levels depending upon the amount of time needed for refining.

 

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