Fibre cross-sections

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  • Created by: Steff06
  • Created on: 08-06-16 19:26
Describe the cross-section of a cotton fibre when dryed out
Collapses into bean-like shape (flattens).
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What does the smooth surface prevent?
Prevents air from being trapped in the fabric - making it a poor insulator.
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Why is there no lustre in cotton?
The twisted length does not reflect light.
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Describe an immature cotton fibre's cross-section
Not twisted - round cross-section for plant nutrients to travel through.
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Describe the cross-section of linen
Many sided cross-section. Long regular length.
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How is linen's slight lustre produced?
Flat, long sides reflect light.
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What are the cross markings called?
Called nodes - give a slub appearance.
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Where does silk come from and what is it made by?
Spinnerette of silk moth/caterpillar.
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Describe the silk filament
Smooth, continuous filament.
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What is the cross-section of silk like?
Triangular cross section.
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How is silk's lustre achieved?
Able to reflect light well.
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What helps wool to repel water?
Covered with lenolin which is a natural grease.
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What causes wool to matt and felt?
Moisture, heat and friction.
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How are viscose fibres set?
Coagulating/setting liquid fibres in a bath of chemicals at irregular rate.
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What does viscose have along its length?
Has tiny grooves/striations across its length.
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What is the effect of these striations?
Produce an irregular cross-section.
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Why does viscose reflect light?
Has a smooth surface.
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What can be added?
Delustering chemical can be added is lustre is an unwanted property.
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When is the delustering chemical added?
Added to spinning solution to reduce reflection of light.
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What does the shape of a fibre's cross-section affect?
The lustre and handle.
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How can the shape of a fibre be changed?
Using a spinerette.
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What does the cross-section of synthetic fibres look like?
Look like glass rods.
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Why do synthetic fibres reflect light?
Continuous filament, smooth surface.
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Why are synthetic fibres poor insulators?
They are smooth and do not trap air.
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Describe the cross section of nylon and polyester
Circular cross-section
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How can nylon be made more comfortable?
By modifying the cross-section into a tri-lobal shape.
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Why does this make the nylon more comfortable?
Fibre surface will have less contact with the skin when worn.
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Other cards in this set

Card 2

Front

What does the smooth surface prevent?

Back

Prevents air from being trapped in the fabric - making it a poor insulator.

Card 3

Front

Why is there no lustre in cotton?

Back

Preview of the front of card 3

Card 4

Front

Describe an immature cotton fibre's cross-section

Back

Preview of the front of card 4

Card 5

Front

Describe the cross-section of linen

Back

Preview of the front of card 5
View more cards

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