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TAPPI T 248 Laboratory beating of pulp






Laboratory beating of pulp (PFI mill method)


TAPPI T 248 describes the processing of pulp by means of the PFI mill to evaluate pulp quality for papermaking. In principle, the standard practice applies to all types of pulp; in practice, the method may not give satisfactory results with certain very long fiber pulps such as cotton. The standard practice is especially suited to processing small quantities of test specimens that are too small for processing in the Valley beater, as described in TAPPI T 200 “Laboratory Processing of Pulp (Beater Method).”


A measured amount of pulp at specified concentration is beaten between a roll with bars and a smooth-walled beater housing, both rotating in the same direction but at different peripheral speeds. Beating action is achieved through the differential rotational action and the application of a specified load between the beater roll and housing for a specified number of revolutions.


While no one laboratory method of beating pulp can simulate commercial refining practices, the PFI mill method is very well accepted for use on small sample sizes. Physical testing of laboratory-beaten pulps provides significant data that aid in determining the ultimate performance of pulp when converted to paper.


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