The discolored results of numerous motor washings and the Early fading of manufacturing textiles are indications of a lack of quality. This is why color Fastness tests are gaining international meaning. There are a quantity of test methods systematically used for colour Fastness and for dyes. The more requisite are:
- Grey Scale for Assessing convert in Colour: This Grey Scale is for assessing changes in colour of leather in colour fastness tests, for example, wash fastness, perspiration fastness, etc. The scale consists of nine pAirs of grey colour chips all representing a optic divergence and contrast.
Leather Colors
- Grey Scale for Assessing Staining: This Grey Scale is for assessing the degree of staining caused by a dyed leather in colour fastness tests. For example, the staining of wool and cotton fabrics in the wash fastness, perspiration fastness, etc. The scale consists of nine pAirs of grey colour chips each representing a optic divergence and contrast.
- Colour Fastness of Leather to Light: This recipe is intended for determining the resistance of the colour of leather to the activity of a standard synthetic light source. The Xenon lamp has an emission wavelength profile close to daylight. The side to be tested of the leather sample is exposed to light from a Xenon Lamp, under controlled conditions, along with eight blue dyed wool standards (blue scale). The light fastness is assessed by comparing the fading of the leather with the fading of the blue standards. The fading is typically made in 2 exposure times to great aid the evaluation.
- Colour Fastness of Leather to Mild Washing: Fastness of the colour of leather to hand washing is the resistance to washing under mild domestic laundering in water. In washing leather, not only changes in colour can
Occur in the leather, but coloured substances may bleed from it and may stain adjacent textile materials.
- Colour Fastness of Leather to motor Washing: Fastness of the colour of leather to motor washing is the resistance to washing under domestic motor laundering in water. In washing leather, not only changes in colour can occur in the leather, but coloured substances may bleed from it and may stain adjacent textile materials.
- Colour Fastness of Small Samples to Dry Cleaning Solutions: This recipe is intended only for determining the resistance of the colour and the quit of leather to dry cleaning solutions. It does not cover the suitability of composites or faultless leather garMents to dry cleaning processes.
- Colour Fastness of Leather to Migration into Plasticized Pvc: The colour fastness in respect of migration into plasticised poly(vinyl chloride) - Pvc - is the transfer of colour from leather to white plasticised Pvc at 50 C. The side of the leather sample to be tested is settled on a white pigMented sheet of
Plasticised Pvc and the composite speciMen is exposed to heat under pressure in an standard apparatus for16 h at 50 C.
- Colour Fastness of Leather to Perspiration: By fastness of colour of leather to perspiration is meant its resistance to the continued activity of an synthetic perspiration solution.
Another way of test is Chrome-free leather. This leather has slowly gained market importance, particularly for automobile cushion applications. In many respects, however, chrome-free leather is inferior to chrome-tanned leather. Uv and heat are known to be more detriMental to chrome-free leather than to chrome-tanned leather, especially in regard to the colorfastness of dyestuff and mechanical properties. Temperature, Uv radiation, and humidity are key environmental factors that influence leather properties. The role of humidity and its interaction with Uv radiation and temperature on leather properties, however, are not clear to the leather industry, and this facts is needed for formulation of antioxidants that will safe chrome-free leather from Uv and heat damage.
Leather Test Methods For Colorfastness and Color determinationFriends Link : Buy Shopping Discount The Walking Dead Season 2
No comments:
Post a Comment