Spheronization of cylindrical extrudates on a rotating friction plate involves breakage and rounding. Little attention has been given to the breakage stage and quantitative modeling of this process is scarce. Two simple models are compared with experimental data obtained for the early stages of spheronization of microcrystalline cellulose/water extrudates. Tests were conducted for different times (t), rotational speeds (ω), initial loadings, and on pyramidal friction plates with different dimensions. The first model, describing the number of pellets, validated ω³t as a characteristic time scale for the breakage stage. The kinetic parameters obtained by fitting showed a systematic dependence on plate dimensions expressed as a scaled gap width. The second model, a simple population balance, described the evolution of the number and length of pellets. The pseudo rate constants provided insights into the kinetics: extrudates tended to break near the middle, while breakage of smaller pellets was slowed down by more pellet–pellet collisions.

中文翻译：

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对圆柱状糊料挤出物的球形化过程中的破损阶段进行建模

圆柱形挤出物在旋转摩擦板上的球形化涉及断裂和倒圆。几乎没有关注破损阶段，并且该过程的定量模型很少。将两个简单的模型与为微晶纤维素/水挤出物的球形化的早期阶段获得的实验数据进行比较。针对不同的时间（t），转速（ω），初始载荷以及在具有不同尺寸的金字塔形摩擦板上进行了测试。第一个模型，描述小球，经验证的数ω ³吨作为破损阶段的特征时间标度。通过拟合获得的动力学参数显示出对板尺寸的系统依赖性，该尺寸表示为缩放的间隙宽度。第二种模型是简单的种群平衡，描述了颗粒数量和长度的演变。伪速率常数提供了动力学方面的见解：挤出物倾向于在中部附近破裂，而较小的颗粒的破裂因更多的颗粒-颗粒碰撞而减慢了速度。