1. White water circulation as a means to evaluate fines properties
Rafael Giner Tovar
Institute of Pulp, Paper and Fibre Technology

2. The significance of fines
Fines are defined as particles passing through a 200-mesh (76 µm hole diameter)
This fraction influences the mechanical properties of paper
Tensile strength
Dewatering
Optical properties …
To study this influence, a constant amount of fines is required

3. White water recirculation
The white water of each handsheet is recirculated
The fines content increase until a steady state is achieved
3 different mesh-sizes were studied (120,325,500)
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4. White water recirculation
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5. Determination of fines content
A constant amount of fines was achieved after forming a certain amount of handsheets
325-mesh used for further trials
Effects of different materials were evaluated
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