BOARD (PAPER), DRAINABILITY TESTS, FUNNELS (LABORATORY), PAPER, PAPER PULP,SPECIFICATIONS, TABLES (DATA), TEST EQUIPMENT, TEST SPECIMENS, TESTING, TESTINGCONDITIONS
适用范围
1.1
The Canadian Standard Freeness test is designed to give a measure of the
rate at which a dilute suspension of pulp may be dewatered. The drainage rate,
or freeness, has been shown to be related to the surface conditions and
swelling of the fibres, and is a useful index of the amount of mechanical
treatment given to the pulp. 1.2
The procedure was originally designed to yield a test value suitable
primarily for the control of manufacture of groundwood pulp. It is also widely
used to follow the changes in drainage rate of various chemical pulps during
beating or refining. 1.3
Treatments which produce a large proportion of fines may sometimes cause an
anomalous rise of freeness (false freeness) usually at values below 100 mL. 1.4
Freeness values do not necessarily correlate with the drainage behaviour of
pulp material on a commercial paper machine.