Wool is the most important natural fiber in the world, which is sheared from sheep or goats and composed mainly of animal proteins. The properties of wool fiber include good elasticity and low abrasion resistance. In addition, it is very comfortable and attacked by moths. Additionally, wool fiber is used in the production of clothing, such as making suits, dresses, coats and carpets. Say no to plagiarism. Get a tailor-made essay on “Why violent video games should not be banned”?Get the original essay Wool-producing countries According to the most recent available figures from the International Wool Textiles Organization, approximately 1.155 million kg of clean raw wool are produced in 20183. Although wool is produced in more than 100 countries around the world, more than 90% of the wool in the global textile market is produced by the following 11 largest wool-producing countries. According to the International Wool Textiles Organization, Australia, China, the United States, New Zealand and Argentina are the world's leading wool-producing countries. Australia is the country with the largest wool production in the world, responsible for producing 25% of the world's wool. There are approximately 70 million sheep in Australia, producing an average of 4.6 kg of wool per head and a total yield of 340 million kilograms of greasy wool. Having a high number of sheep raised, Australian industries can produce a large amount of wool. In recent years, Australia's annual wool production has remained at 330,000 tonnes. China is the world's second largest producer of wool, with an annual production of around 160,000 tonnes. The United States produced 25.7 million pounds of wool. The world's fourth largest producer of wool is New Zealand, which produces 11% of the world's wool. The fifth largest wool producing country is Argentina, which produces 3% of the world's wool. The comparison between greasy wool and worsted yarn Wool is obtained by shearing the fleece from the back of the sheep once a year, which requires undergoing a series of procedures to transform it into a useful yarn. In addition, greasy wool is the raw material of wool, while worsted yarn is in the form of yarn. There are three differences between greasy wool and worsted yarn. Firstly, the composition of oily wool contains certain impurities, while worsted yarn is free from impurities. Oily wool is shorn from sheep that have not undergone any steps to remove impurities such as wool grease, sweat and dirt from the wool. Therefore, oily wool may contain ingredients such as ointment, plant matter and other ointments. On the contrary, after carrying out the general procedures to turn into yarn, the worsted yarn is lighter and purer than greasy wool. Second, the other difference between greasy wool and worsted yarn is the structure. The combed yarn is formed after the twist enters the straightened and parallel fibers. With less air trapped between the fibers, the worsted yarn will tend to be heavy. On the contrary, greasy wool will not undergo any twisting treatment, which will result in greasy wool voluntarily trapping more air and will therefore be much bouncier and lighter. Furthermore, the fiber length of greasy wool depends on the growth rate which depends on genetic and environmental factors, while the length of worsted yarn depends on the spinning process. However, the fiber surface structure of greasy wool and worsted yarn is the same. Both are made from wool fibers that contain different lengths.