FIBRE LENGTH – WIDTH – CURL
Purpose of the test
This test is performed to determine the length, width and curl of fibre in a pulp.
Procedure
Operate the instrument in accordance with ISO 16085-2 and the manufacturer’s instructions.
Soak the samples in tap water for at least 4 h.
Disintegrate the sample for 2000 revolutions in approximately 2000 ml of tap water, thus reaching a stock concentration of about 1 g/l.
If you are unsure of the stock concentration, perform determination of stock concentration (a single measurement should be enough.)
Stir well before taking a sample from the suspension.
Perform the measurement (sample size, etc.) according to the manufacturer’s instructions.
Report 2 measures for length in mm, width in µm and curl, their mean and standard deviation calculated to 3 significant figures.
ISO 16065-2
Nr. of samples
Ca. 2 g of air-dried pulp per Level.
No special size
Levels
Length:
Level 1: 0.70÷1.00 mm
Level 2: 2.00÷2.50 mm
Width:
Level 1: 15.0÷25.0 µm
Level 1: 20.0÷30.0 µm
Reporting
Report 2 valid results of measurements of length in mm and width in µm, their mean and their standard deviation. All to three significant digits.
Record the curl in the comment field.
Cepi test 11.1
11.1(a): length
11.1(b): width