PURPOSE
To determine
the resistance of the colour of textiles to colour change and colour staining
when subjected to hot pressing.
EQUIPMENT
• Heating
device according to ISO105-X11
• Smooth
heat-resistant sheet, of thickness 3mm to 6mm
• Padding, wool
flannel of mass per unit area approx. 260 g/m2
• Undyed,
bleached and unmercerized cotton cloth of mass per unit area 100-130 g/m2
• Cotton
adjacent fabric, measuring 4 cm x 10 cm
• Distilled
water, grade 3
• Light box
with light source D65
• Grey scale
for assessing change in colour (ISO 105-A02)
• Grey scale
for assessing staining (ISO 105-A03)
TEST
SPECIMEN
Three specimens
for each colour and material measuring 4 cm x 10 cm; one for dry pressing, one
for damp pressing, and one for wet pressing.
Labels, badges and trims need to be tested against the
fabric of which it is attached as well as against cotton adjacent fabric.
METHOD
1.
Choose pressing temperature according to the ironing symbol on care label
(110°C, 150°C or 200°C).
2. Cover the
bottom plate of the heating device with the heat resistant sheet, wool flannel
padding (use two layers to make a pad of thickness approx. 3 mm) and the dry
undyed cotton cloth.
Dry pressing
1.
Place the dry specimen on top of the cotton cloth covering the wool flannel
padding.
2. Lower the
top plate of the heating device and leave the specimen for 15s at the chosen
temperature.
Damp
pressing
1.
Place the dry specimen on top of the cotton cloth covering the wool flannel
padding.
2.
Soak a piece of cotton adjacent fabric in distilled water.
3.
Squeeze the wet cotton adjacent fabric and place it on top of the dry specimen.
4. Lower the
top plate of the heating device and leave the specimen for 15 sec at the chosen
temperature.
Wet pressing
1. Soak the
specimen and a piece of cotton adjacent fabric in distilled water.
2.
Squeeze them and place them on top of the dry cotton cloth covering the wool
flannel padding and place the wet adjacent fabric on the specimen.
3. Lower the
top plate of the heating device and leave the specimen for 15 sec at the chosen
temperature.
RESULTS
When the
specimens are dry assess the colour staining on the adjacent fabric. Also
assess change in colour and cross staining on all the specimens.
