NATURAL FIBRES II Ch-2 II Part- 2 II Fibers & Fabrics II Fashion Studies II Class XI CBSE

#fashion #class11 #youtube Link for resource material- https://cbseacademic.nic.in/web_mater... _________________________________________________ NATURAL FIBRES PRPERTIES OF COOTON PROPERTIES OF WOOL PROPERTIES OF SILK It is cellulosic in nature, therefore on burning emits the smell of burning paper. The length of the fibre ranges from 10 mm to 65 mm depending on the variety of cotton. Cotton fibres are hygroscopic in nature which means that it can absorb around 8.5% of moisture of its dry weight. This gives the fibre the ability to absorb perspiration (sweat) when made into textiles. Moreover, the hygroscopic nature prevents the cotton fabric to develop static electricity. This makes it is suitable for wearing in hot and humid weather. The strength of jute fibres are higher than cotton and elongate less than cotton on application of weight. This property makes it suitable to be used in bags and sacks to carry heavy weight. Flax fibres are very strong and stiff in handle. Flax fibres (linen fabric) creases easily due to its stiff nature. This is one major difference from cotton fibre though both are cellulosic in nature. The surface of the wool fibre has scales. The wool fibre is crimped which gives woolen fabric the natural bulkiness and warmth. The crimp in wool provides air space in the woollen fabrics. This warmth in wool is due to the air spaces which trap air and air being an insulator retains (does not lose) the body heat. Wool absorbs moisture more than cotton. Sericin is also known as the ‘silk gum’ which gives raw silk a coarse handle. This silk gum can be easily removed by a process called ‘degumming’ to give silk a smooth handle and bright lustre. It is for this reason that raw silk is coarse in handle and lacks lustre, but degummed silk is soft and lustrous. Subject Name: Fashion Studies Subject Code: 837 Grade: XI Chapter: 2 Introduction to Fibres, Dyeing & Printing Topic Discussed- 2.2.2 Natural Fibres Marks: 100 (60-Thoery, 40-Practical) D