Cellulosic fibrils grinding

Mechanical separation of cellulose fibrils from natural fibre resources may involve the process of grinding to apply shear stress to the longitudinal axis of the fibres, so that the fibrillated fibres will have diameters ranging 20—90 nm (Taniguchi and Okamura, 1998). Ultrasonic extraction is another approach to disrupt the adhesion among the fibrils so as to extract nanofibrils from both cellulosic and protein fibre sources... 

The Supermass colloider used in the formation of cellulosic fibrils has been described earlier in Sect. 5.2. The gap between the stones, which had a grit size of 46, was adjusted to 80 pm. Grinding was performed at room temperature and the... 

In the case of grinding, the cellulose fibers go over a state of fine fibrillation into a more or less powdery substance. This mechanical severance of cellulose may break main valence bonds and will, therefore, decrease its degree of polymerization. In addition, the crystal structure of cellulose fibers is nearly lost [32]. Grinding of the cellulose fibers also, appreciably increases its surface area. 

Vartiainen, J., Pohler, T., Sirola, K., Pylkkanen, L., Alenius, H., Hokkinen, J.,. .. Laukkanen, A. (2011). Health and environmental safety aspects of friction grinding and spray drying of micro-fibrillated cellulose. (3), 775-786. 

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