Exam (elaborations)
CLO2601 JUN 2018 Past Paper
- Institution
- University Of South Africa (Unisa)
CLO2601 JUN 2018 Past Paper.
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By: meghanhouy02 • 2 year ago
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Exam prepCLO2601
May/June 2018
Question 1
1.1.1 Natural, protein, fur
1.1.2 Natural, cellulosic, seed fibre
1.1.3 Manufactured, non-cellulosic
1.1.4 Manufactured, mineral
1.2 Acrylic
1.3 Production of wool:
1. Shearing – the woollen fleece of sheep is cut off. Typically, a sheep is sheared
once a year.
2. Grading and sorting – grading breaks up the fleece based on overall quality. In
sorting, the wool is broken up into sections of different quality fibres, from
different parts of the body.
3. Scouring – the raw wool contains grease, dirt, sand and (dried sweat) suint. This
process cleans the wool in a series of alkaline baths.
4. Carding – fibres are passed through a series of metal teeth that straighten and
bend them into slivers. It also removes residual dirt.
1
, 5. Spinning – thread is formed by spinning the fibres together to form yarn.
1.4.1 Wet spinning
1.4.1 It is used for fibre forming filaments that have been dissolved in solvents.
The spinneret is submerged into the coagulation bath.
As the filaments emerge, they precipitate from solution and solidify.
The solution is extruded directly into the precipitation liquid; hence it is called wet
spinning. Rayon and spandex are examples.
Question 2
2.1 Eco-labelling provides brief information on environment-related qualities of the fibre. It
indicates to the consumer fibres that have been produces sustainably with eco-friendly materials
and processes.
They assure the customer that the item they are buying was made in an environmentally
responsible manner.
2
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