If you reduce the amount of refining of a fiber, the RBA decreases and the fiber

length increases. For the other parameters in the problem above, what breaking

length do you predict if the RBA decreases to $30\%$ but the fiber length increases

to $3mm.$

Gurley test. Calculate the Darcy permeability coefficient for paper with a

thickness of $0\mathrm{.}12mm$ that has a Gurley time of $80$ seconds.

The water retention test for a certain pulp gives a value of $1\mathrm{.}2\frac{g}{g}($grams water

$/$grams fiber$).$ This value is the moisture content. This value often is similar to

the solids that is obtained after the press section. What solids does this value of

water retention value represent?