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Silk is a natural protein fiber. It is similar to wool in that it is composed of amino acids arranged in a polypeptide chain. Silk is produced by the larvae of a moth, while wool is produced by animals. All protein fibres have some general characteristics in common.
Manmade protein fibers are produced by dissolving proteins like casein from milk, soya bean protein, and zein from corn in diluted alkali and forcing these solutions through a spinneret into an acid-formaldehyde coagulating bath.
Hair fibres obtained from different kinds of animals also contribute to the fabric formation such as Musk-Ox (qiviut), Alpaca, Mohair, Cashmere, Camel etc.
Silk is a protein fiber made from silkworms and is the only natural fiber that is a filament fiber. Silk fibers spun by several species of arthropods have existed naturally for hundreds of millions of years.
Wool, common name applied to the soft, curly fibres obtained chiefly from the fleece of domesticated sheep, and used extensively in textile manufacturing.
Manmade protein fibers are produced by dissolving proteins like casein from milk, soya bean protein, and zein from corn in diluted alkali and forcing these solutions through a spinneret into an acid-formaldehyde coagulating bath.
The protein fibers are formed by natural animal sources through condensation of a-amino acids to form repeating polyamide units with a various substituent on the a-carbon atom. In general, protein fibers are fibers of moderate strength, resiliency, and elasticity. They have excellent moisture absorbency and transport characteristics. They do not build up a static charge. Example of some these fibers is Wool, Silk, Mohair, Cashmere etc.