dyeing

Question 1

foam dyeing

Answer 1

economical and environmentally friendly because it uses less water

Question 2

artistic dyeing

Answer 2

creates a pattern of colour by preventing dye from reaching certain areas

Question 3

batch dyeing

Answer 3

circulated through a dye bath; low cost and flexible in terms of colour

Question 4

stages: pre-fibre

Answer 4

solution dyeing; good for hard to dye fibres; high cost

Question 5

stages: fibre

Answer 5

stock dyeing (loose fibres are dyed before spinning); good dye penetration; high cost

Question 6

stages: yarn

Answer 6

yarns are wrapped on beams and then submerged in dye vats; crates patterned fabrics; high cost

Question 7

stages: fabric

Answer 7

can be union dyed where there is even colouring in fabric; produces solid colour; requires well prepared materials

Question 8

stages: product

Answer 8

apparel or finished products; cheapest process; seams may have uneven penetration

Question 9

migration

Answer 9

dye molecules move from dye bath to the fibre

Question 10

fixation

Answer 10

dye molecules are secured to the fibres by the use of heat or mordants

Question 11

diffusion

Answer 11

dye molecules diffuse into the amorphous regions of the fibres

Question 12

order of dyeing (7)

Answer 12

Wetting out
Immersion
Agitation
Migration
Exhaustion
Diffusion
Fixation