Color fastness of dyed goods .

• The color textiles show different resistance power to different agencies such as light, wash, rubbing, perspiration, water, bleach, acid, alkali etc.. Major Color Fastness Testes Col

Prepared By : Mazadul Hasan sheshir ID: 2010000400008

13 th Batch (session 2009-2013) Department : Wet Processing Technology Email: mazadulhasan@yahoo.com

Blog : www Textilelab.blogspot.com (visit)

Southeast University

• The stability of color or its fastness is one of the most important

requirements of valuable customers Colour fastness of a dyed goods means the resistance power of a dyed goods against any hazards.

• The color textiles show different resistance power to different agencies

such as light, wash, rubbing, perspiration, water, bleach, acid, alkali etc

• There are many types of testing of color fastness But in the industry the

fastness test is done according to the buyer requirement.

Major Color Fastness Testes

 Colorfastness to Washing

 Colorfastness to Crocking / Rubbing

 Colorfastness to Perspiration

 Colorfastness to Hot Pressing

 Colorfastness to Dry Cleaning

 Colorfastness to Light

• Colorfastness to Washing is a method for determining the

resistance of the colour of textiles from all kinds of wash in water with soap and detergent There are different test methods to check the color fastness to washing which is standardized by ISO.

Test Temp.( ° C) Time (mints) Steel balls Chemicals

ISO-105-CO1 40 30 0 Soap(5 g/l)

ISO-105-CO2 50 45 0 Soap(5 g/l)

ISO-105-CO3 60 30 0 Soap(5g/l) +soda ( 2 g/l)

ISO-105-CO4 95 30 10 Soap(5g/l) +soda ( 2 g/l)

Color Fastness To Wash

Test Procedure (Color fastness to wash)

APPARATUS AND MATERIALS:

 Gyro wash m/c (Wash-wheel & Stainless steel

 ISO type grey scale for changing shade

 ISO type grey scale for staining

 Color matching cabinet (light box).

Sample Preparation:

If the textile to be tested in fabric: Cut the sample fabric 10cm ×4 cm and make sure all colors are included (if necessary use additional specimens) in it Sew it along all four edges with the same size of multi fiber fabric This is the composite test specimen.

If the textile to be tested is yarn or loose fiber: Take a mass of yarn or fiber approximately equal to ½ of the combined mass of the adjacent fabrics, then place between a 10cm ×4 cm piece of multi – fiber fabric and a piece of same size non dye able fabric and sew them along all four sides This is the composite test specimen.

According to ISO RECOMMENDATION NO3 (ISO 105 C03):  The composite specimen is treated in a wash wheel or an equivalent apparatus at 60

± 2°C (140±3.6°F) for 30 mints using the color fastness test detergents 77(ISO Std soap) 5 g/l and 2 g/l soda ash to a given liquor ratio of 50:1.

• Finally we decreased the temperature and washed with cold water and dry them

untreated sample with the changing grey scale and

staining of color in the adjacent multi-fiber fabric with the staining grey scale.

under standard lighting of D65 (Artificial day light).

Fig: Grey scale

Format of test Report

Description of test Test result

Color fastness to washing Method followed: ISO-105-C03 GRADE

Color Fastness To Rubbing

Equipment that needed for measurement:

• a)    Lock the test specimen (textile sample) onto

the base of the crock meter.

b)    Using the spinal clip, set 5 Cm × 5Cm of the

white cotton fabric to the finger of the crock

meter.

c)    Lower the covered finger on the test sample.

d)    Turn hand crank at the rate of the one turn

per second.

e)    Remove the white rubbing test cloth and e

valuate with grey scale.

Test Procedure of Color Fastness To

Rubbing:

•In this stage compare the

contrast between the

treated and untreated

white rubbing cloth with

grey scale and rated 1 to 5.

Color Fastness to light

• This test measures the resistance to

fading of dyed textile when exposed to

day-light.The test sample is exposed to

light for a certain time(24 hrs, 36 hrs,48 hrs, 72 hrs, etc) or by customer demand

and compare the change with original

unexposed sample.The changes are

assessed by Blue Scales (1-8).

covered and 1/2 exposed) together with standard

dyed wool samples (1-8).

frame.The composite sample must be protected from rain.

• Evaluation is made numerically by European/American

blue Scale (1-8).

Color Fastness to Perspiration:

Principle:

• The garments which come into contact

with the body where perspiration is heavy may suffer serious local

discoloration This test is intended to determine the resistance of color of dyed textile to the action of acidic and alkaline perspiration

• Perspiration Tester

• Oven, maintained at 37 ± 2ºC temperature

• Multifiber test fabric

• Grey Scale

• Color matching chamber

• Acidic and Alkaline solution

• Glass or Acrylic plate

• Weight etc

place in an oven for 4 hours at 37 ± 2ºC temperature.

– Remove the specimen and hang to dry in warm air not exceeding 60ºC.

Evaluation is done by Grey Scale in a color matching

cabinet and rated from 1 to 5.

Colorfastness to Hot Pressing

Principle

Determination of the resistance of the color of dyed textiles to ironing and pressing on the hot cylinder

Apparatus and Materials:

Test specimen:

Cut 10cm x 4cm specimen from each fabric sample

a Place the dry specimen on top of the cotton cloth

covering the wool flannel pad

leave the test specimen for 15 sec at the recommended

Damp Pressing

A.

cotton adjacent fabric in distilled water.

B.

specimen and repeat iii (b)

Numerically rate the staining of the more heavily

stained side of the cotton adjunct fabric under std

light using Grey Scale (1-5)

Test Report

• i Mention the testing temperature

• ii Test condition (dry, damp, wet)

• iii Numerical rating after testing and

after 4 hrs

• iv Report the numerical rating for the

staining of cotton adjacent fabric

1 Yarn Manufacturing Technology