Effect of pulp refining on thixotropy of cellulose fiber suspensions, TAPPI Journal September 2025

 


Application: Understanding the progressive breakdown on shearing and slow rebuild at rest with thixotropic structures is of vital importance for the proper functioning and operation of different process equipment in the pulp and paper industry, as variations in viscosity pose difficulties in mixing and handling of pulp suspensions during the different process steps.

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Author: Jorge H. Sánchez and Mary A. Rivera
Effect of pulp refining on thixotropy of cellulose fiber sus
ABSTRACT: This paper presents results on the thixotropic behavior of low-consistency bleached eucalyptus fiber suspensions that had been mechanically treated. The pulps were refined in a PFI mill at different numbers of revolutions (0, 3000, and 6000) to study the effect of refining intensity on the viscosity time-response of fiber suspensions. In steady rheological tests, all the suspensions exhibited shear thinning behavior and no significant differences were observed after mechanical treatment. Stepwise experiments showed that viscosity continuously increased with time when shear rate was suddenly reduced. Additionally, a delay in time evolution of viscosity was observed as the pulp was more refined. A stretched exponential model was fitted to the experimental results of viscosity.
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