Report of visual evaluation of white samples near to CIE limits

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24410%2F16%3A00001333" target="_blank" >RIV/46747885:24410/16:00001333 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Report of visual evaluation of white samples near to CIE limits

Original language description

A number of materials such as cotton fibres, paper, etc. have a yellowish shade because of the lignin, which is present inside fibre or that organically binds individual fibres together. Final applications require substrates with the greatest possible whiteness and brightness. The consumer judges the whitest shirt to be freshest and cleanest and will automatically choose it from several on display. Why? A white is connected with purity, freshness, and cleanness. In some products whiteness is not only psychologically associated with purity but also is actually an indicator of freedom from contaminants, and as such it can be a measure of the quality of the product. This means that manufacturers have to find ways of whitening and brightening their products. This is done by bleaching and cooking the raw form of substrate (fibres, pulp, etc.), but this is a time-consuming and costly process. It was found that in some cases, calculated CIE whiteness values increased with increasing amount of colours in the whitened substrate appeared darker or redder to the observers. Small deviations in measured CIE tristimulus functions X, Y, and Z often caused significant changes in calculated CIE, and Ganz whiteness values.A visual assessment study of the selected samples was carried out in order to relate the influence of the high tint to perceive white. The results show the deficiencies in the current measurement techniques for assessment of brightness and whiteness of textile fabrics containing optical brightening agents.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

JS - Reliability and quality management, industrial testing

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů