This question on fibre identification was not properly handled. Some were busy telling stories instead of giving precise answers.
The required answers to the question are as follows:
1(a) Advantages of Polyester
- It drapes/hangs well
- It is strong/durable/hardwearing
- it is easy to launder/easy to care for
- It does not fade.
- It is not easily stained
- It does not shrink
- It is mothproof
- It has good sunlight resistance.
- It dries quickly.
- It can be heat set/thermoplastic.
- It is relatively cheap.
- It is insect resistant.
- It can be blended with natural fibre
- It resists acids and bleaches
- It is resistant to alkaline
- It is flame resistant
- It is crease resistant
- It resists abrasion.
Disadvantages
- It does not absorb water readily
- It pills badly (forms tiny balls on the surface)
- It builds up static electricity.
- It cannot withstand high heat (poor conductor of heat)
- With continuous use yarns separate.
(b) (i) - Properties of Linen
- It is strong
- Stronger when wet than dry
- It is very absorbent
- It is comfortable to wear
- It can withstand high temperature
- It is smooth/ It has no fluffy surface
- It is inflammable
- It is firm to handle
- It gives a good tailored effect
- It is damaged by acid
- It is attacked by mildew
- It frays easily
- It is expensive
(ii) Finishes given to Linen
- Beetling
- Crease resistant finish
- Sizing
- Shrinkage control
(iii) Sewing Tips
- Use open seam to reduce bulk
- Neaten raw edges to prevent fraying
- Press on wrong side to avoid a shiny surface
- Fold pattern pieces neatly to avoid creases
- Use needle of suitable size for the weight of the fabric
- Assemble linen fabric quickly after cutting out to prevent fraying
(c) Identification of Wool
Approaching flame - it curls away from flame
In flame - it smoulders
- It does not flare up
Out of flame - it stops burning
Smell - burning feathers or hair
Residue - black beads which can easily crush
