BS ISO 2648:2020
$142.49
Wool. Determination of fibre length distribution parameters. Capacitance method
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 30 |
This document specifies a method for the determination of fibre length distribution parameters (principally mean length, expressed as Hauteur or Barbe, and the coefficient of variation of the measurement) on slivers and rovings made from combed wool or combed synthetic fibres.
As the fibres of different chemical structure have different di-electric values, the method is not directly applicable to slivers made up of a blend of wool/synthetic fibres.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Principle 5 Apparatus 5.1 Measuring apparatus. |
| 11 | 6 Conditioning and testing atmosphere 6.1 Conditioning atmosphere 6.1.1 General |
| 12 | 6.2 Testing atmosphere 7 Sampling and preparation of laboratory sample 7.1 Sampling 7.2 Preparation of laboratory sample 7.2.1 General 7.2.2 Slivers of combed wool weighing between 15 g/m and 30 g/m 7.2.3 Rovings or slivers weighing less than 15 g/m |
| 13 | 7.2.4 Rovings or slivers weighing more than 30 g/m 8 Procedure 8.1 Preparation of test specimen 8.2 Measurement |
| 14 | 9 Calculation and expression of results 9.1 Analogue system 9.1.1 Calculation of Hauteur (H) and Barbe (B) 9.1.2 Calculation of coefficient of variation of Hauteur CVH |
| 15 | 9.1.3 Percentage of short fibres 9.1.4 Use of the nomograms 9.2 Digital system 9.2.1 General 9.2.2 Calculation of Hauteur (H) 9.2.3 Calculation of the coefficient of variation of Hauteur, CVH |
| 16 | 9.2.4 Calculation of Barbe (B) 9.2.5 Calculation of the coefficient of variation of Barbe, CVB 9.2.6 Tuft diagram 9.2.7 Fibre length attributes (L values and K values) |
| 17 | 10 Test report 10.1 General 11 Precision 11.1 Precision of the method 11.2 Within and between laboratory variation for Hauteur and Barbe |
| 18 | 11.3 95 % confidence intervals for Hauteur and Barbe 11.4 MPD% values for Hauteur and Barbe based on k measurements |
| 20 | Annex A (normative) Preparation of top and sliver |
| 23 | Annex B (normative) Test specimen preparation |
| 25 | Annex C (informative) Precision of the method |
| 29 | Bibliography |
