They answered the questions on differences between natural and synthetic fibres very
well and did not perform well on advantages of blends.
The required answers to the questions are as follows:
(a) Differences between natural and synthetic fibres
|
|
NATURAL FIBRE |
SYNTHETIC FIBRE |
(i) |
Source |
Obtained from nature |
Obtained from chemicals |
(ii) |
Lustre |
Less lustrous |
Very lustrous |
(iii) |
Absorbency |
Very absorbent, |
Less absorbent |
|
|
Absorbs dye easily |
Does not absorb dye easily |
(b) Examples of the natural and synthetic fibres
Natural Fibres Synthetic Fibres
Silk Nylon
Wool Polyester
Cotton Acrylics.
Linen Courtelle, orlon
Jute Spandex
Sisal Lycra
Coir Terylene
Kapok Glass fibre
Pina Metallic fibre
Dynel
Crepe, Dacron
Crimpline
Modacrylics
(c) Reasons for blending fabrics
(i) To produce variety of fabrics
(ii) To avoid mill waste
(iii) To improve wearing qualities/durability to be comfortable to wear.
(iv) To reduce production cost of fabric
(v) Combines the advantages of both fibres while minimizing their
disadvantages.
(vi) To improve launder ability.
(vii) To make fabrics attractive
(viii) To strengthen weaker fabric
(ix) To make fabric more absorbent
(x) To improve texture
(d) Advantages of the following blends
(i)
Wool and Polyester
- Makes the fabric washable
- Fabric can be permanently pleated.
- Produces inexpensive blend
- Fabric become more lustrous
- Weight of fabric becomes lighter
(ii)
Cotton and Nylon
- Fabric is cool to wear
- Fabric is crease resistant
- Fabric is easy to launder.
- Fabric does not shrink
- Fabric dries quickly.
- Fabric become more absorbent
