silk - technology, types, market, production, processing, projects, machinery, company profiles
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7/27/2019 Silk - Technology, Types, Market, Production, Processing, Projects, Machinery, Company Profiles
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Technology, Types, Market, Production,
Processing, Projects, Machinery, Company Profiles
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General
Silk is 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 Bombyx morireared in captivity (sericulture). The
shimmering appearance for which silk is prized comes from the fibers
triangular prism-like structure which allows silk cloth to refract incoming
light at different angles.
There are five major types of silk of commercial importance, obtained from
different species of silkworms which in turn feed on a number of food
plants. These are: Mulberry, Tasar, Muga, Eri
Process
Silks are produced by several other insects, but only the silk of moth
caterpillars has been used for textile manufacture. There has been some
research into other silks, which have differences at the molecular level. Silks
are mainly produced by the larvae of insects with complete metamorphosis,
but also by some adult insects such as webspinners. Silk production is
especially common in the Hymenoptera (bees, wasps, and ants), and is
sometimes used in nest construction. Other types of arthropod produce silk,
most notably various arachnids such as spiders.
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The process of drawing silk fibre from the cocoon is called reeling. The
cocoons are cooked in hot water and the silk fibre is unwound from the
cocoons. The silk consists of two proteins, the inner core of fibroin and an
outer cover of gum sericin. During reeling, the cocoons are processed in hot
water at 95-970C for 10-15 minutes. This process is called cooking. This
cooking will enable the sericin portion to get softened and make unwindingeasy without breaks. The cocoons after cooking are reeled in hot water in
different types of machines.
Technology
Silk Reeling is simply the unwinding of filaments from a group of cocoons
in hot water bath on to a reel. There are two methods of reeling a) Direct
Reeling method on standard reels and b) Indirect method which includes
preliminary reeling on small sized reels and transferring the reeled silk
directly from the reels to standard sized reels on re-reeling machines.
Market
The annual production of silk in the world is estimated at 45,000 tonnes of
which Japan and China contribute 18,936 and 13,200 tonnes respectively.
South Korea, USSR and India are the other leading sericultural countries in
the world. The industry has survived the stiff competition with the
man-made fibres and it is now estimated by the Food and Agriculture
Organisation of the United Nations that the total requirement of silk by 1980
would be of the order of 80,000 tonnes, leaving a demand of 35,000 tonnes.China leads the world with silk production of 102560 MT or 81.7% of the
produce. India ranks second in respect of world raw silk production. It is
this position, as one of only two major silk producers in the world, and from
its employment potential, that sericulture and silk derive their importance in
the Indian textile map.
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