Fibre Line Mass Balance

Improve fibre accounting throughout the process

Fibre accounting in a mill requires accurate measurements of mass balance for incoming wood chips, digester throughput, pulp yield, bleaching and drying process. However, this fibre accounting is heavily impacted by wood chips moisture content, non-wood debris (rock, metal, ice and snow), chip size distribution, bark content, process fibre loss and fibre degradation throughout the process.

FPInnovations has developed a fibre line mass balance tool to help kraft mills improve determination of their gate-to-gate fibre losses. Using this tool, FPInnovations can identify high fibre loss operations in the mill, by breaking the process down into specific production modules, allowing each to be evaluated separately for fibre input, loss and output. Mill data, data from both open and FPInnovations literature is used to determine fibre use at each unit operation. The complete fibre loss balance can then be obtained and integrated within the mill’s net fibre yield calculations to support their budget in relation to wood costs.

Your Benefits

Gate-to-gate fiber loss studies by measuring fibre losses at each unit operation, usually allow the mill to obtain net savings from $200,000 to $500,000 per year:
  • Unnecessarily sources of sewering fibre. Past experiences show that most mills sewer about 20 to 40 tpd of fiber and that in many cases 1 to 5 tpd can be recovered.
  • Too much white wood in the bark going to be hogged before burning.
  • Inaccurate volume and/or mass measurement of the incoming wood. (In some cases mills are paying for more than they actually receive.)