Yield Measurement in Mills Using Secondary Fiber, 1994 Recycling Symposium Proceedings
William P. Moore
Over the years, even though the measurement of yield at a virgin pulp mill was not a simple task, we have become comfortable with various procedures and assumptions required to obtain yield data. Many of the same factors that make it difficult to measure yield in a wood-based mill are present in mills that use recovered paper as a source of raw material. Continuous process measurements, multi phase flow, and measurement of fiber loss in reject streams all contribute to the difficulties of measuring yield on secondary fiber. As the industry continues to use additional recovered paper, it will become more important to measure predictably the yield on a routine basis.
This paper concentrates on OCC-based systems and does not go into any great detail on deinking systems. The same unit operations and approaches also apply to the fiber cleaning portion of secondary fiber deinking mills.
Yield Measurement in Mills Using Secondary Fiber, 1994 Recycling Symposium Proceedings