Page 42 - Science Class 06
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POLYESTER
The fabrics made from polyester fibre Aim : To detect whether a sample of
have good elas city, wrinkle resistance, fibre is natural or ar ficial.
shape reten on, excellent wash-and-wear Procedure : Take out threads from the
performance and durability and so on, so piece of co on cloth and from the piece
that it is widely used in all kinds of apparel of polyester cloth. Now, light a candle.
fabrics. However, because polyester fibre is Take the flame close to the threads of
poor in moisture absorp on, its clothing polyester cloth, you will see that it starts
makes the wearer feel hot and s cky, mel ng, but if you take the flame close to
produces sta c electricity easily which the threads of co on cloth it does not
results in clothing absorbing dust and melt. In this way, you can detect whether
clinging to the body and has poor comfort. a piece of cloth is natural or ar ficial
fibre.
Polyester fibres like nylon absorb very li le
Polyester is the most commonly used water. Clothes made of polyester, therefore,
synthe c fibre. DuPont introduced its dry quickly. They retain crease and lasts for
Dacron brand of polyester in 1951, but long me. That’s why polyester is widely
the material itself was patented earlier in used in manufacturing of various kinds of
1941. dress materials and curtains.
Weaving : Making cloth from threads or yarn using equipments
Handloom : Cloths making on simple equipments using hands
Powerloom : Cloths making on machines that run by electricity
Natural fibre : Fibres obtained from plants and animals
Artificial fibre : Fibres obtained after synthesising chemicals
Sericulture : Breeding of silkworms for commercial purposes
Compound : A pure substance made up of different elements
Let's R
Let's R
Let's R
Let's R
Let's Revise evise evise evise evise evise evise
Let's R
Let's R
i Clothes affect our physical, mental, social and emotional abilities and are deeply related to
personality.
i Modern mechanised textile manufacturing was first developed in Britain.
i Spinning Jenny was invented by Hargreaves in 1795.
i The technique of weaving is about 2000 years old.
i Cotton, jute, flax and hemp are plant fibres.
42 Science-6
