Concetti Chiave
- Man-made fibres are divided into cellulose-based and non-cellulose synthetic fibres, with the former derived from natural cellulose and the latter from mineral substances.
- Cellulose-based fibres like viscose rayon are created using wood pulp or cotton linters, undergoing chemical treatment to form regenerated cellulose fibres.
- The manufacturing process of viscose rayon involves purifying cellulose, chemically treating it, extruding it through a spinneret, and spinning it into yarns.
- Viscose rayon is known for its absorbency, softness, drape, and silk-like appearance, but it is not strong when wet and creases easily.
- Common applications of viscose rayon include home textiles and clothing items such as bedsheets, dresses, and underwear.
Man-made or Synthetic fibres
Man-made fibres can be classified into two main headings -
1. The cellulose-based fibres: made from cellulose which is obtained from cotton linters or wood pulp for example viscose rayon, acetate.
2. Non-cellulose man-made or synthetic fibres: made entirely from mineral substances such as coal and petroleum for example nylon, polyester, acrylics, etc.
Viscose rayon:
What is viscose rayon and its process?
Viscose rayon is made by treating wood pulp or cotton linters with certain chemicals. It is therefore called regenerated cellulose fibre. There are other types of rayon such as cuprammonium rayon.
Manufacturing process:
1. The cellulose (wood pulp or cotton linters) is first purified.
2. The cellulose is then treated with the right chemicals. It is changed into a thick liquid.
3. The liquid is then forced through a nozzle containing many fine holes called a spinneret. The rayon filaments or fibres are produced.
4. The filaments are spun into yarns. The yarns are woven into fabrics.
- It is absorbent.
- it is soft and drapes well.
- it is not very strong especially when wet.
- it creases easily.
- it is cool to wear.
- it has smooth surface.
- it resembles silk in appearance only.
- it dyes well.
- it is not easily attacked by mildew.
- it is mothproof.
Uses of viscose rayon
Viscose rayon is used for bedsheets, bed-covers, home furnishings, table-cover, underwears, dresses, etc.
Domande da interrogazione
- What are the two main categories of man-made fibres?
- What are the characteristics and uses of viscose rayon?
Man-made fibres are classified into cellulose-based fibres, like viscose rayon and acetate, and non-cellulose synthetic fibres, such as nylon, polyester, and acrylics, which are made from mineral substances like coal and petroleum.
Viscose rayon is absorbent, soft, drapes well, and resembles silk in appearance. It is not very strong when wet, creases easily, and is cool to wear. It is used for bedsheets, home furnishings, table covers, underwear, and dresses.
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