摘要
Poplar alkaline peroxide mechanical pulp （APMP） was refined in a PFI mill at varied revolution and the properties of the refined fibers and the resulting hand sheets were tested. The raw poplar APMP fibers are stiff and have been detached from the lamella during APMP pulping process. During the refining process, the APMP fibers did not swell and fibrillate; they were easily broken and formed into fragments. The breaking length of formed hand sheets increased as the heating degree increased because lots of hydrogen bonds were formed between fibers and fine pieces. The tear strength of hand sheets first increased and then decreased as the beating degree changed from 17 to 70~SR. The maximum tear strength was achieved at 61 ~SR of the beating degree. These results indicated that the hydrogen bond between the fibers was the main factor influencing the tear index followed by the fiber length. Along with the increase of the beating degree, the sheet density increased while the opacity decreased.
