TAPPI T 254 cm-10:2010 Edition
$14.95
Cupriethylenediamine Disperse Viscosity of Pulp (Falling Ball Method)
| Published By | Publication Date | Number of Pages |
| TAPPI | 2010 | 10 |
This method describes a rapid procedure (1, 2, 3) for
the measurement of the viscosity of 1% cellulose solutions using
cupriethylenediamine saturated with cupric hydroxide
[Cu(OH)2] as the solvent. For convenience, this may be
referred to as Cu(En)2 or CED.
This method is the preferred procedure for pulps containing more
than 4% lignin; however, many high yield pulps, at levels above
50%, contain sufficient lignin (in excess of 10%) to interfere with
the test. The falling ball method may be used over the entire range
of bleached and unbleached pulps and is well suited to production
control. However, the preferred procedure for pulps with less than
4% lignin, as defined by TAPPI T 222 "Acid-Insoluble Lignin in Wood
and Pulp," is TAPPI T 230 "Viscosity of Pulp (Capillary Viscometer
Method)," which should be used for referee purposes on these
pulps.
This procedure covers preparation of cupriethylenediamine,
dissolving the sample, viscometer calibration, and measurement of
the viscosity of the sample solution.
