I wish to share an innovative technique I developed for characterising
pulp quality. The parameter combines freeness and length-weighted fibre
length (LWFL), and is defined as the LWFL adjusted to Canadian Standard
Freeness (CSF) of 100 mL.
The relation****p between fibre length and freeness approximates
linearity over significant ranges, and this relation****p was exploited
to produce the Adjusted Fibre Length:
AFL = b.(100 - CSF) + LWFL
The parameter b is derived from the relation****p between fibre length
and freeness as estimated by the following equation:
LWFL = b.CSF + constant
(If you wish to use time series data to estimate b, please note that
autocorrelation must be considered to get the best estimate.)
AFL was used very successfully in a TMP mill to indicate primary
refiner plate wear. A real time trend of AFL for three refiners was
produced from online freeness and fibre length data from a PulpExpert
instrument. When all plates were in good condition, AFL was similar for
all refiners. When plate wear was excessive for a refiner, AFL
decreased significantly compared to the others.
The major advantage with AFL is that it is much easier for operators to
follow trends with one varying parameter, compared with two varying
parameters.
AFL may also be useful for monitoring furnish quality.
If you have any queries, please contact me.
Gary Ash BAppSc MEngSc
mserror@[EMAIL PROTECTED]
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