Recovery from pulping wood is commonly
expressed as the percentage, by oven-dry weight, of
pulp obtained from the original wood weight.
A recovery value of 45% means that for every 100
oven-dry pounds of wood processed, 45 oven-dry
pounds of pulp is produced. When expressed in this
manner, pulp yield is mainly a function of the pulping
process. There is some difference between hardwoods
and softwoods when pulped by chemical
processes, due to the difference in chemical makeup
between these groups. Table 8-1 provides a
summary of common pulping processes and yields.
Section G of Appendix 2 shows percentage use of
hardwood and softwood species.