How do you test the color fastness of fabric?
Colour Fastness Testing on Fabrics can be done by 5 methods. They are:
- Colour Fastness due to rubbing.
- Colour Fastness due to washing / Dry-cleaning.
- Colour Fastness due to Perspiration and Sea Water.
- Colour Fastness due to sunlight.
- Colour Fastness due to hot pressing and Dry Heat.
Which one of the following chemical is used in testing of perspiration fastness of dyed textiles?
ISO 105 E04 During this test, the lab soaks the fabric in a simulated perspiration solution for 30 minutes under a fixed pressure and then dries it slowly at an elevated temperature. ISO 105 E04 tests for color fastness to both acidic and alkaline perspiration.
What are the factors with which color fastness is assessed separately?
Color fastness is usually assessed separately with respect to: Changes in the colour of the specimen being tested that is colour fading. Staining of undyed material which is in contact with the specimen during the test that is bleeding of colour.
Which chemical is used to colour?
The important chemical types are azo, anthraquinone and phthalocyanine, which cover the whole of the visible spectrum and thus give a complete colour range. These dyes are soluble in water giving anionic species. They are usually applied at ca 373 K.
What is Ks value in dyeing?
K/S (Absorption coefficient (K) and Scattering coefficient (S)) is a value used to determine the depth of color of a dyed fabric. K/S values are used in textile applications to control the color process parameters in dyeing, and finishing of fabrics.
What is shade percentage?
Shade percentage: Shade percentage refer to the quantity of dye taken for dyeing expressed as a percentage of the dry weight of the fiber to be dyed. Dye Assistants: Dyeing assistant are chemicals that facilitate, in one way or another, the production of the required shades in dyeing.
How is color strength calculated?
One can find the lowest value of R (which is maximum value of absorbance) and obtain K/S values of sample and the standard and compute the strength….Color Strength = [(K/S) Batch / (K/S) Standard] x 100
- R Min(Absorbance Maxima)
- At given Wavelength.
- Based on Tristimulus Values.
How is KS value calculated?
Why color fastness properties is important for fabric?
Importance of Color Fastness: It is a property of a colorant which allows it to retain its different characteristics despite degradation conditions such as exposure to light and dry cleaning. Product performance and evaluation to determine if the fabric is suitable for the intended end use.
What is the unit for color?
A unit of color is the color produced by 1 mg/L platinum in the form of chloroplatinum ion. The color values measured by comparison with the platinum-cobalt standards can be expressed as PCU, Pt-Co, APHA, or Hazen units depending on the specific procedures.
What is APHA standard?
APHA is a leader in setting standards for the public health field and influencing public health policy. APHA and the Association of Schools and Programs of Public Health are the two corporate members of the nonprofit Council on Education for Public Health.
What is unit of color?