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GB/T 26459-2011: Pulp, paper and board -- Determination of the post color number
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 26459-2011 | English | 139 |
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Pulp, paper and board -- Determination of the post color number
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GB/T 26459-2011
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Basic data | Standard ID | GB/T 26459-2011 (GB/T26459-2011) | | Description (Translated English) | Pulp, paper and board -- Determination of the post color number | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y30 | | Classification of International Standard | 85-010 | | Word Count Estimation | 6,680 | | Date of Issue | 2011-05-12 | | Date of Implementation | 2011-09-15 | | Quoted Standard | GB/T 450; GB/T 740; GB/T 7973; GB/T 7974; GB/T 24324 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 6 of 2011 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies based on Kubelka-Munk theory, by measuring paper, board and pulp light scattering coefficient and absorption coefficient obtained yellowing values. This standard applies to white and near white sheet of paper, paperboard and pulp, not to contain fluorescent brighteners paper, paperboard and pulp. | GB/T 26459-2011: Pulp, paper and board -- Determination of the post color number---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Pulp, paper and board. Determination of the post color number
ICS 85-010
Y30
National Standards of People's Republic of China
Paper, board and pulp yellowing value
Issued on. 2011-05-12
2011-09-15 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
The standard proposed by China National Light Industry Council.
The standard paper by the National Standardization Technical Committee (SAC/TC141) centralized.
This standard was drafted. China Pulp and Paper Research Institute, Shandong Huatai Paper Co., Ltd., the national paper quality supervision and inspection center,
China Paper Association Professional Committee of Standardization.
The main drafters of this standard. Zhangqing Wen, Gao Jun.
Paper, board and pulp yellowing value
1 Scope
This standard is based on the provisions of the Kubelka-Munk theory, by measuring paper, paperboard and pulp light scattering coefficient and light absorption coefficients
Yellowing value method.
This standard applies to white and near white paper, paperboard and pulp, does not apply to paper, paperboard and pulp containing fluorescent brighteners.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
Latitude and take samples to GB/T 450 paper and paperboard samples, positive and negative determination
GB/T 740 pulp samples taken
GB/T 7973 paper, board and pulp - Determination of diffuse reflectance factor (diffusion/vertical method)
GB/T 7974 paper, paperboard and pulp brightness (whiteness) measured diffusion/vertical method
GB/T 24324 Pulp physical testing laboratory sheets prepared by conventional sheet former method
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
Reflection factor R reflectancefactor
By a flux of radiation reflected from an object under the same conditions perfectly reflecting diffuser reflected ratio of radiation flux, expressed as a percentage.
3.2
Internal reflection factor R∞ intrinsicluminousreflectancefactor
Sample layers to achieve opaque, that the measurement result is no longer doubled light reflection factor and change with time of sample layers.
3.3
Light scattering coefficient S lightscatteringcoefficient
Light passes through the diffusion flux partially reflected infinite sheet material, the application of Kubelka-Munk theory and there is this part of the luminous flux
Reflective material layer thickness limit of light-dependent, and taking into account the quantitative relationship between material, units of m2/kg.
3.4
Light absorption coefficient K lightabsorptioncoefficient
Light passes through the diffusion flux partially absorbed by the infinite sheet material, the application of Kubelka-Munk theory and there is this part of the luminous flux
Absorption edge thickness of the material layer is light-dependent, and taking into account the quantitative relationship between material, units of m2/kg.
3.5
Yellowing value postcolornumber
After a certain storage time a sample of the affected environment or other factors appear whiteness decline, a phenomenon known as reversion. Yellowing process
Degree with a return value indicates yellow, also known as the PC value.
Principle 4
Application of Kubelka-Munk theory, the measured light scattering coefficient and absorption coefficient of the sample before and after aging, yellowing calculated value.
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