Product Detail: This practice describes the procedure using the TAPPI
sheet machine for preparing reflectance-testing specimen sheets of bleached or
unbleached pulp whose fibers are readily dispersed in water. This practice
permits the preparation of sheets having a smooth and reproducible surface for
reflectance measurements with a minimum of washing or contamination of the
sample.
The pulp sample slurry is adjusted to a pH of 6.5 ± 0.5.
TAPPI Standard Practice T 218 describes a procedure for using
the Büchner funnel to make handsheets for the same application. The purpose for
having two practices is discussed in sections 4.3 and 4.4.
