This standard practice 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 fibered pulps such as cotton. The standard practice is especially suited to processing test specimens too small for processing in the Valley beater, as described in T 200.

 

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.

 

Laboratory beating of the pulp is a widely accepted method of simulating commercial refining practices. Physical testing of laboratory-beaten pulps provides significant data that aid in determining the ultimate performance of pulp when converted to paper.

 

From the sample of pulp being tested, 24 grams oven-dried pulp is required for each refining interval. For dry lap pulps cut edges should be avoid. Normally, four to five refining intervals are tested.

 

Please note:
IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.