Highly fibrillated cellulose, including cellulose micro or nanofibrils (CMFs or CNFs), has been extensively investigated. However, its morphological properties defined as the degree of fibrillation vary over time according to the fiber sources and preparation methods. In this study, a facile method for evaluating the degree of fibrillation was developed using a conventional Canadian standard freeness (CSF) tester and the obtained values were called drainage volumes (DVs). The standard screen used in the CSF test is used to retain fibers and fibril, but the screens in the DV test to fractionate the fibrils by their size. Two DVs of the highly fibrillated cellulose were obtained using two special mesh size screens in the DV test. The differences between two DVs were found to have a linear relationship with the degree of fibrillation and the average fibril width of the highly fibrillated cellulose. They also exhibited a linear relationship with the crystallinity, degree of polymerization and the mechanical properties of the fibril-based sheets. Two commercial CNFs produced by paper mills with different wood sources were evaluated using the developed method. Their DV differences enabled the estimation of their degree of fibrillation, with which the average fibril widths and physical and mechanical properties were predicted and they were found to be well matched.

高度原纤化的纤维素，包括纤维素微纤丝或纳米纤丝（CMFs 或 CNFs），已被广泛研究。然而，其定义为原纤化程度的形态特性根据纤维来源和制备方法随时间而变化。在这项研究中，使用传统的加拿大标准游离度 (CSF) 测试仪开发了一种用于评估纤颤程度的简便方法，获得的值称为排水量 (DVs)。CSF 测试中使用的标准筛网用于保留纤维和原纤维，但 DV 测试中的筛网根据原纤维的大小进行分级。在 DV 测试中使用两个特殊筛目尺寸的筛网获得了两个高度原纤化纤维素的 DV。发现两个DV之间的差异与原纤化程度和高度原纤化纤维素的平均原纤宽度呈线性关系。它们还与原纤维基片材的结晶度、聚合度和机械性能呈线性关系。使用开发的方法评估了由不同木材来源的造纸厂生产的两种商业 CNF。它们的 DV 差异能够估计它们的原纤维化程度，从而预测平均原纤维宽度和物理和机械性能，并且发现它们非常匹配。使用开发的方法评估了由不同木材来源的造纸厂生产的两种商业 CNF。它们的 DV 差异能够估计它们的原纤维化程度，从而预测平均原纤维宽度和物理和机械性能，并且发现它们非常匹配。使用开发的方法评估了由不同木材来源的造纸厂生产的两种商业 CNF。它们的 DV 差异能够估计它们的原纤维化程度，从而预测平均原纤维宽度和物理和机械性能，并且发现它们非常匹配。