THEORETICAL NORMALIZED REFINING SPACE (TNRS) AS A NEW TOOL FOR ASSESSING THE PULP REFINING PROCESS, TAPPICon24

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Pulp refining process is one of the most important technological operations in papermaking. The purpose of this process is to develop the ability of the cellulosic fibers to create a mechanically durable paper structure. Despite its great importance in paper technology, pulp refining is still not fully described and researched. One of the reasons of this situation is the fact that the refining process depends on both the refining device with its settings and the properties of the raw material. This results in the lack of the universal method that would allow to describe this process in global terms. The global description of the refining process means also that for a given pulp refined in a specific device, the result of each refining trial could be located in a limited space of available refining results. This would allow for immediate information on the results of a given refining process, also in terms of paper properties and energy consumption. The concept of the normalized refining space called further Theoretical Normalized Refining Space (TNRS) was introduced by the authors in 2019 (Olejnik, K., Fabijańska, A., Pełczyński, P., Stanisławska, A. 2019. Controllability of low-consistency chemical pulp refining process, Computers and Chemical Engineering, 128(2), 468-476). It was defined as a three-dimensional space of parameters representing three primary refining effects: fiber WRV, average fiber length and fines content which could be obtained within the limits of the process technological parameters. In other words, refining space TNRS contains all theoretically possible combinations of the primary refining effects. In order to define the Theoretical Normalized Refining Space (TNRS) as accurately as possible, the refining trials should be conducted to the limits of the given device. In the TNRS space, which takes the form of a unit cube, the diagonal of this cube (Fig. 1) can be considered as the line of the uniform evolution of primary refining effects (abbreviated URE Line - Uniform Refining Evolution Line). As a result, each refining of the given pulp can be compared with the values on the URE line.

The value of the given refining effect above the URE line means that at this point the change was greater than the average in the process. Values below the URE line mean that changes occurred slower than the average.

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