papr16 - Paper Machine Material Balances Lecture 16 PAPR...

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1 Paper Machine Material Balances Lecture 16 PAPR 1000 Introduction to Pulp and Paper Manufacturer
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2 Retention on the Paper Machine ± Two parameters are used to measure the retention of fibers and additives during paper forming: ± First pass retention (%) = (amount retained in sheet / amount from headbox) ± Overall retention (%) = (amount retained in sheet / amount added with stock)
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3 First-pass Retention (FPR) ± FPR- the extent a pulp stock furnish are retained on the paper machine wire. ± This measures the efficiency with which furnish stock pumped to the headbox is converted into paper sheet output. ± A low FPR value means that a large amount of solids merely recirculates between the wire and thick stock without being turned into useful product, making the system work harder to produce a given volume of paper ± These unretained solids eventually end up at the paper mill effluent ± FPR commonly ranges from 60-90%, which in turn depends on furnish quality, basis weight, initial machine speed, and wire configuration.
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4 First-pass Retention (FPR) Measurement
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papr16 - Paper Machine Material Balances Lecture 16 PAPR...

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