GB/T 40969-2021 Translated English of Chinese Standard (GB/T 40969-2021, GBT40969-2021): Paper and board -- Determination of colour (D50/2¡ã diffuse reflectance method) [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]https://www.chinesestandard.net, 01/12/2022 - 19 páginas This document describes a method for determining the color of paper and cardboard by the diffuse reflectance method with the elimination of gloss. This document applies to paper and cardboard for printing. When the amount of ultraviolet radiation irradiated by the light source of the instrument on the sample is adjusted to be consistent with the fluorescence reference standard under CIE illuminant C provided by the authorized laboratory specified in GB/T 40277, this method can be used for the determination of the color of paper and cardboard that contains fluorescent whitening. This document does not apply to paper and cardboard to which fluorescent dyes or color dyes have been added. |
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1/3 in formula 20 nm intervals 5.1 Reflection photometer 5.2 Reference standard A.1 and Table abridged spectrophotometer according to formula according to GB/T adjusted ASTM authorized laboratory available are weighted black cavity board and pulps calculated according Checksum White point CIE illuminant D50 CIE tristimulus values CIELAB colour space color difference conditions of CIE correction and measuring D50 and CIE ensure Filter-type reflectance photometer filters fluorescence reference standard instruments with bandpass instruments without bandpass international standard intrinsic radiance factor ISO brightness measuring at 20 modified in relation nm intervals Source Normative references Note number of layers number of sample Paper and board paper and cardboard replaced by GB/T Sinolight spectral data spectral reflectance factor standard observer Table A.1 Table A.3 temperature and humidity test interval top side ultraviolet UV content irradiated wad of samples Wavelength Checksum White Wavelength Table Weighting function D50/2 White point Table wire sides Y/Y n