Dual-beard sampling method for fibre length measurements

72-78<span style="font-size: 9.0pt;mso-bidi-font-size:12.0pt" lang="EN-GB">A new method for fibre length measurement using dual-beard sampling method has been developed. The dual-beard sampling method is used to produce a dual-beard sample on which fibres are held in the middle and combed from both sides. The dual-beard can be scanned from the holding line synchronously to generate fibrograms. The mathematical relationship between the fibrogram and the weight-based distribution of the original sample is derived and the equations are established to calculate mean length by weight, coefficient of variation, modal length and quality length of the original sample. Finally, experiments are performed and the results show that the dual-beard sampling method can be used to measure fibre length distributions.