| Popis: |
The range of natural fibres and the diversity of their important properties are so broad that it is impossible to provide a comprehensive coverage of appropriate testing methods in one short chapter. For the most important fibres, cotton and wool, many excellent books have been previously published. The characteristics of natural fibres are diverse between the different fibre types. The variability within any specific type poses challenges for sampling to ensure that results are representative and reliable; sampling therefore forms an important aspect of the early content of the chapter. The remaining parts deal, in Section 12.4, with testing for the key physical properties common to most natural fibres and some of the testing methods available; in Section 12.5, with a limited range of tests for chemical properties applied to natural cellulosic fibres; and finally, in Section 12.6, with examples of modern physical and chemical analytical methods with the focus upon examples of how these have been adopted to investigate fibre properties. The importance of testing to meet the demands of the international trading environment and process automation leads to the conclusion that global standardisation of test methods and quality specifications is likely to become even more important in the future. |
