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Optical measurements of paper and textile: Influences from the instrumental setups and the structural and surface characteristics
RISE, Innventia.
2015 (English)In: 9th International paper and coating chemistry symposium, Tokyo, Japan, Oct 29, 2015Conference paper, Published paper (Other academic)
Abstract [en]

Spectral reflectance, radiance factors, gloss etc of paper and textile are often regarded as intrinsic properties of the materials alone. But in practice, instrumental readings of these properties depend even on the instruments setups, for instance, illumination/detection geometries, UV contents of the illumination, measurement areas etc. Comparative studies with four commercial spectrophotometers of three illumination/detection geometries, Diffuse/0-deg, Diffuse/8-deg and 45-deg/0-deg, have been conducted. These geometries are used in paper, textile and graphic industries, respectively. The materials analysed in this study include white and colour papers and textiles. The white papers contain fluorescent whitening agents (FWAs) whose excitation energies are only in UV wavelength bands. On the contrary, the colour papers have fluorescent agents whose excitation energies are in the visible wavelength bands, according to our measurements. Textile reference standards of different whiteness values are also included in order to study the influences from surface texture. The study confirms the strong influences of instruments setups, e.g. illumination/detection geometries, UV contents of the light sources etc, on the measured results. The study also reveals the significant influences from the combination of instrumental setups with the structural and surface characteristics of the measured samples.

Place, publisher, year, edition, pages
2015.
Keyword [en]
optical measurement, textile, paper properties, instrumentation
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-29135OAI: oai:DiVA.org:ri-29135DiVA: diva2:1083144
Conference
9th International paper and coating chemistry symposium, Tokyo, Japan, Oct 29
Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2017-03-20Bibliographically approved

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