Fibre to Fabric
A fibre is a long and strong hair like strand obtained from natural sources or man-made sources. Fibres are classified into two type’s namely natural fibres and synthetic fibres. Natural fibres are further classified as plant fibres and animal fibres. Jute, cotton, etc. are some plant fibres whereas wool, silk, etc. are some animal fibres. The common synthetic fibres made by human-beings are rayon, nylon,etc. Wool is obtained from the fleece of wool yielding animals like sheep, yak, etc. which are used to make fabrics, jackets, shawls, etc. The processing of fibres to wool is done in nine steps which includes shearing, scouring, sorting, drying, carding, dying, roving, spinning and weaving. Some Indian breeds of sheep are Lohi, Rampur bushair, Nali, Marwari, etc. Silk is one of the most priced fabric. According to an old Chinese legend, silk was discovered by Chinese empress “Si-lung-Chi”. Silk fibres are animal fibres made of proteins. Silk is obtained from silkworms which are cultured on commercial scale to obtain silk. Silkworms are caterpillars of silk moth. The rearing of silkworms for obtaining silk is called sericulture. The life cycle of silk moth include eggs, larvae, pupa, cocoon and adult moth. Silk fibres from cocoons are separated out and reeled into silk threads and finally weavers weave silk threads into silk cloth.
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The fibre that retains more air isMarks:1
Explanation:Wool is fluffy and retains more air than silk, nylon and rayon.
Sorter’s disease is caused due toMarks:1
Explanation:The people working as a sorter in woolen industries often get infected by sorter’s disease, which is a blood disease, due to a bacterium called Anthrax.
Boiling of cocoons to obtain silk fibres is known asMarks:1
Explanation:Reeling is the process of separating thread from cocoons. In this process, the cocoons are boiled to kill the insects. The boiled water dissolves the sticky substance which holds the cocoon filaments in place. After heating, the filaments from four to eight cocoons are joined and twisted to form a thread. The thread is wound on a reel. Reeling is also done by special machines which unwind the fibres of the silk from the cocoon.
Woolen clothes keep us warm becauseMarks:1
wool traps air and air is a poor conductor of heat.
Air spaces between the wool fibres trap air. Since, air is a poor conductor of heat; it shields the body against cold and keeps us warm.
An example of animal fibre isMarks:1
Explanation:Silk is an animal fibre obtained from silkworm.