1、Shape and appearance of common natural fibers,Class 104 Ye Xu,Classification,Natural cellulosic fibers,Protein fibers,Cotton,Flax,Ramie,Cotton,Reality,Growing development,Morphological characteristics,The cotton fiber has a elongated flat belt shape, and both of the ends are thick but the middle is

2、relatively fine. 1.The longitudinal morphology natural convolution and flat belt,maturely,2.The cross-section morphology waist circular and lumen,Flax,1.The longitudinal morphology,The surface is smooth but has transverse crack,2.The cross-section morphology,Polygonal and has lumen,Ramie,1.The longi

3、tudinal morphology relatively straight, transverse diametral pitch , vertical stripes,2.The cross-section morphology,waist circular and lumen、crack on cell wall,Classification,Natural cellulose fiber,Animal fiber,Animal fibers,Description of the contents,silk,wool,Description of the contents,Silk is

4、 a natural protein fiber, some forms of which can be woven into textiles. The best-known type of silk is obtained from cocoons made by the larvae of the silkworm reared in captivity (sericulture).,Wool is the fiber derived from the fur of animals of the Caprinae family, principally sheep, but the ha

5、ir of certain species of other mammals such as goats, alpacas, and rabbits may also be called wool,silk,The life of silkworm,The appearance of silk,The silk gland of silkworm,The cross-section of silk,triangle,The use of silk,wool,A great many of keratinized cells form the wool. It is very fine and the cross-section is nearly round, but the thick wool turn to be ellipsoidal. 1.The cross-section morphology Nearly round, the finer t