scope:

Paper machine clothing traditionally has been evaluated by days life and cost per ton indices. Achievement of maximum clothing life and minimum cost per ton often results in significant reductions in paper machine operating performance. Sacrifices in machine performance to reduce clothing costs can reduce total mill profitability significantly. Alternate clothing evaluation techniques based on impact on paper machine performance have been developed. These techniques relate key operating parameters to the clothing run. Two techniques which have proven useful over a broad spectrum of machines are described. The techniques are most beneficial when clothing performance is monitored over several months or years.