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
About 2 g of air-dried pulp are provided per level
No special size
Levels
Length:
Level 1: 0.7÷1.0 mm
Level 2: 2.0÷2.5 mm
Width:
Level 1: 12÷25 µm
Level 1: 15÷35 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.