GB/T 2679.1-2020 Translated English of Chinese Standard (GB/T 2679.1-2020, GBT2679.1-2020): Paper--Determination of transmittance--Diffuse reflectance measurement

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https://www.chinesestandard.net, 3 feb 2023 - 14 pagine
This Part of GB/T 2679 specifies the method for determination of transmittance by diffuse reflectance measurement. This Part applies to white and near-white translucent paper. To measure paper containing fluorescent whitening agents, use a UV cut-off filter to eliminate fluorescence excitation. Note: Although GB/T 7973 allows the use of filter reflectometers and abridged spectrophotometers, if the filter reflectometer cannot eliminate the excitation of fluorescence, it is not suitable for testing the transmittance of paper containing fluorescent whitening agents.
 

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Sommario

Foreword
3
Scope
6
Principle
7
Apparatus
8
Sampling
9
Calculation
10
Annex A Informative Structural changes of this Part compared with
11
Annex B Normative Spectral characteristics of reflectometer for determining diffuse reflectance factor
12

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