| Abstract:The aspen APMP was beated using PFI mill and trough beater, the effects of beating on fiber morphology and quality, papermaking performance were studied. The change of fiber morphology was observed with optical microscope, fiber length, curl, kink and other mophological parameters and change of fines content were analyzed by Fiber Quality Analyzer (FQA). The high/low freeness pulps prepared by refining in the lab were mixed to the same freeness level of the secondary refiner of the mill, then the papermaking performance of the pulps was compared. With the continuing refining, fiber length decreased, fiber curl index and kink index increased first and then decreased, and the fines content increased. Compared to the low consistency refining, medium consistency refining had an excellent result: much more fibers were crushed and fibrillated and less fibers were cut off. The bulk property of the paper made of the mixed high and low freeness pulps prepared in the lab was improved compared with the paper made of the pulp from the secondary refiner of the mill. And this feature is more significant when using the medium refining. |
