The charge demand, beating degree, and water retention value (WRV) of fines that come from original (P200) and fiber fragment (P′200) were studied under various stock conductivities and treating times.

Focused on poplar APMP with the beating degree of 65 °SR,the content of fines passing through 200-mesh sieve was determined by screening experiment and the effects of fines on handsheet performance,such as tensile strength,tear strength,tightness and opacity were also studied.

Focused on poplar APMP with the beating degree of 65°SR, the content of fines passing through 200-mesh sieve was determined by screening experiment and the effects of fines on handsheet performance, such as tensile strength, tear strength, tightness and opacity, were also studied in this paper.

The practice shows that most of lints produced in the drying process are mainly fiber fines and filler particles.

As the degree of white water closure improvement, the fibers and fines in white water will have a certain impact on the operation of paper machine and paper properties.

As the closure degree of white water increases,the fibers and fines in white water will have a certain impact on the operation of paper machine and paper properties.

As the degree of white water closure increases,the fibers and fines in white water will have a certain impact on the operation of paper machine and paper properties.

The fiber length,width,fiber fines content,the indices of the curling and knotting of the fiber were measured with FQA fiber quality analyzer for discriminating of the fibrous raw material,guiding of beating process,predicting pulp application,discriminating pulping technology,guiding of the development of new varieties of raw material thus providing an important support for papermaking.

In this paper,both the original fines(P_(200)) of BEKP and the fragment(P′_(200)) of its long fibers(R_(30)) which came from beating process were studied.