Fibre cross-sections 0.0 / 5 ? TextilesTextilesA2/A-levelAQA Created by: Steff06Created on: 08-06-16 19:26 Describe the cross-section of a cotton fibre when dryed out Collapses into bean-like shape (flattens). 1 of 27 What does the smooth surface prevent? Prevents air from being trapped in the fabric - making it a poor insulator. 2 of 27 Why is there no lustre in cotton? The twisted length does not reflect light. 3 of 27 Describe an immature cotton fibre's cross-section Not twisted - round cross-section for plant nutrients to travel through. 4 of 27 Describe the cross-section of linen Many sided cross-section. Long regular length. 5 of 27 How is linen's slight lustre produced? Flat, long sides reflect light. 6 of 27 What are the cross markings called? Called nodes - give a slub appearance. 7 of 27 Where does silk come from and what is it made by? Spinnerette of silk moth/caterpillar. 8 of 27 Describe the silk filament Smooth, continuous filament. 9 of 27 What is the cross-section of silk like? Triangular cross section. 10 of 27 How is silk's lustre achieved? Able to reflect light well. 11 of 27 What helps wool to repel water? Covered with lenolin which is a natural grease. 12 of 27 What causes wool to matt and felt? Moisture, heat and friction. 13 of 27 How are viscose fibres set? Coagulating/setting liquid fibres in a bath of chemicals at irregular rate. 14 of 27 What does viscose have along its length? Has tiny grooves/striations across its length. 15 of 27 What is the effect of these striations? Produce an irregular cross-section. 16 of 27 Why does viscose reflect light? Has a smooth surface. 17 of 27 What can be added? Delustering chemical can be added is lustre is an unwanted property. 18 of 27 When is the delustering chemical added? Added to spinning solution to reduce reflection of light. 19 of 27 What does the shape of a fibre's cross-section affect? The lustre and handle. 20 of 27 How can the shape of a fibre be changed? Using a spinerette. 21 of 27 What does the cross-section of synthetic fibres look like? Look like glass rods. 22 of 27 Why do synthetic fibres reflect light? Continuous filament, smooth surface. 23 of 27 Why are synthetic fibres poor insulators? They are smooth and do not trap air. 24 of 27 Describe the cross section of nylon and polyester Circular cross-section 25 of 27 How can nylon be made more comfortable? By modifying the cross-section into a tri-lobal shape. 26 of 27 Why does this make the nylon more comfortable? Fibre surface will have less contact with the skin when worn. 27 of 27
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