GB/T 24328.12-2020Tissue paper and tissue products - Part 12: Determination of optical properties--Determination of opacity--Diffuse reflectance method (English PDF)
卫生纸及其制品 第12部分：光学性能的测定 不透明度的测定 漫反射法
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
July 21, 2020
Implementation date
February 1, 2021
Scope
GB/T 24328.12-2020 is the English-translated version of 卫生纸及其制品 第12部分：光学性能的测定 不透明度的测定 漫反射法.
GB/T 24328.12-2020 is the Chinese standard "Tissue paper and tissue products - Part 12: Determination of optical properties--Determination of opacity--Diffuse reflectance method".
Its scope clause reads: This part of GB/T 24328 specifies the method for measuring the opacity (paper backing) of toilet paper and its products using the diffuse reflection method.
This section applies to white or nearly white toilet paper and its products, including toilet paper and its products containing fluorescent whitening agents. This section does not apply to colored toilet paper and its products containing fluorescent dyes or pigments. Its clauses include terms and definitions.
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Document preview — GB/T 24328.12-2020
National Standard of the People's Republic of China
- ICS
- 85.010
- Classification
- Y 30
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 3.1 Reflection factor
- 3.2 Brightness factor
- 3.3 Single-sheetluminancefactor
1 Scope
This part of GB/T 24328 specifies the method for measuring the opacity (paper backing) of toilet paper and its products using the diffuse reflection method.
This section applies to white or nearly white toilet paper and its products, including toilet paper and its products containing fluorescent whitening agents.
This section does not apply to colored toilet paper and its products containing fluorescent dyes or pigments.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
The collection of GB/T 450 paper and paperboard samples and the determination of the longitudinal and transverse directions, front and back sides of the samples (GB/T 450-2008, ISO 186.
2002, MOD)
GB/T 1543-2005 Determination of opacity of paper and paperboard (paper backing) (diffuse reflection method) (ISO 2471.1998, MOD)
GB/T 7973 Determination of diffuse reflection factor of paper, paperboard and pulp (diffuse/vertical method) (GB/T 7973-2003, ISO 2469.
1994, NEQ)
GB/T 10739 Standard atmospheric conditions for handling and testing of paper, paperboard and pulp samples (GB/T 10739-2002, eqvISO 187.
1990)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Reflection factor
Under the same illumination and observation conditions, the ratio of the radiant flux reflected by an object to the radiant flux reflected by a fully reflective diffuser.
Note 1.The reflection factor is expressed as a percentage.
Note 2.For translucent bodies, the reflection factor is affected by the backing.
3.2 Brightness factor
Ry
Using a reflectance photometer that meets the requirements of GB/T 7973, it is measured under the conditions of the spectral characteristics of the CIE1964 supplementary standard color system
The reflection factor.
Note. The brightness factor was previously known as the luminousreflectance factor (luminousreflectancefactor).
3.3 Single-sheetluminancefactor
R0
The brightness factor of the single-layer pattern backing black tube. […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 450Paper and board -- Sampling for testing and identification of machine and cross direction, wire side and felt side
- GB/T 450-2008Paper and board -- Sampling for testing and identification of machine and cross direction, wire side and felt side
- GB/T 1543-2005Paper and board - Determination of opacity(paper backing) - Diffuse reflectance method
- GB/T 7973Paper, board and pulps -- Measurement of diffuse reflectance factor (Diff/Geometry)
- GB/T 7973-2003Paper, board and pulps -- Measurement of diffuse reflectance factor (Diff/Geometry)
- GB/T 10739Paper, board and pulps - Standard atmosphere for conditioning and testing
ISO 186 · ISO 2471.1998 · ISO 2469
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Related Standards
GB/T 10739-1989 — Paper, board and pulps--Conditioning of samples and testing atmospheres
GB/T 10739-2002 — Paper, board and pulps - Standard atmosphere for conditioning and testing
GB/T 10739-2023 — Paper, board and pulps - Standard atmosphere for conditioning and testing
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