warm, soft, felts, natural crimp, water repellent, not easy to set alight, skrinks
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Give 3 properties of cellulose fibres.
easy to set alight, strong, good absorbency, creases, wash/iron at high temperatures
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Describe the cross section of cotton, and how this means cotton shrinks.
A dry cotton fibre is known as being mature, and immature when it is wet. It swells when it is wet, and causes it to shrink as the fibre becomes shorter.
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What properties does the cross section of silk give to the fibre?
(Triangular cross section) Lustre, softness
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What are the scales on a wool fibre covered in? What property does this give the fibre?
Lanolin; Water repellency
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Why do the scales on wool cause the fibre to shrink?
Scales open when wet and interlock.
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What is linen made from?
The flax plant
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What are the irregularities in linen called? What do they cause?
Nodes; slubs
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What are crystalline regions? What properties do they give to the fibre?
Tightly packed areas of a fibre, where molecules are highly oriented (in line, tightly packed); they are stronger areas of the fibre
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What are amorphous regions? What properties do they give to the fibre?
Looser, less oriented areas of the fibre where the molecules are not in line; these areas are weaker and more absorbent
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