论文部分内容阅读
介绍了几种测定化学浆细小纤维特性的新方法,包括测量细小纤维悬浮液的脱水速率、沉降速率和黏度,这些指标和细小纤维的表面性质密切相关。细小纤维悬浮液的脱水速率是用保水值测定仪通过压力过滤测得,测定结果与用常规方法在标准纸页成形过程中所测得的滤水时间一致。用浊度扫描仪测定沉降速率,该装置设有扫描器,能对样品进行自动扫描,这和传统的目测法测得的结果相近。细小纤维悬浮液的布氏黏度与纤维网状结构的水化度有关。这些新方法可简单、快速和准确地测定纤维特性。细小纤维组分越细,纤维的沉降速度越慢,纤维悬浮液的黏度越大。
Several new methods for determining the properties of fines, including measuring the dehydration rate, sedimentation rate and viscosity of fines, are described. These indexes are closely related to the surface properties of fines. The rate of dewatering of the fine fiber suspension was measured by pressure filtration using a water retention tester and the results were in agreement with the filtration times measured during standard sheet formation using conventional methods. The settling rate was measured with a turbidity scanner with a scanner that automatically scanned the sample, similar to the results of a conventional visual inspection. The Brookfield viscosity of the fine fiber suspension is related to the degree of hydration of the fibrous network structure. These new methods allow the determination of fiber properties simply, quickly and accurately. The finer the fine fiber component, the slower the fiber deposition rate, the greater the viscosity of the fiber suspension.