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GB/T 40277-2021Paper, board and pulps - Measurement of diffuse blue reflectance factor(ISO brightness) - Indoor daylight conditions (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

May 21, 2021

Implementation date

December 1, 2021

Scope

GB/T 40277-2021 (Paper, board and pulps - Measurement of diffuse blue reflectance factor(ISO brightness) - Indoor daylight conditions) is available as an English-translated PDF.

GB/T 40277-2021 is the Chinese standard "Paper, board and pulps - Measurement of diffuse blue reflectance factor(ISO brightness) - Indoor daylight conditions". Its scope clause reads: This standard specifies the method for measuring the blue diffuse reflection factor (ISO brightness) of paper, paperboard and pulp under indoor sunlight conditions.

This standard applies to white and nearly white paper, cardboard and pulp.

When testing samples containing fluorescent whitening agents, use a fluorescent reference standard The test can only be carried out when the ultraviolet (UV) radiation energy level of the instrument is adjusted to be consistent with the CIE illuminator C. C light source There is a certain proportion of UV content, which is equivalent to indoor sunlight conditions.

Note. The brightness of D65 is tested by adjusting the instrument to comply with the CIE standard illuminating body D65. Much higher. The test method standard of D65 brightness is GB/T 7974. Its clauses include terms and definitions.

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Document preview — GB/T 40277-2021

National Standard of the People's Republic of China

Classification: Y 30

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references

1 Scope

This standard specifies the method for measuring the blue diffuse reflection factor (ISO brightness) of paper, paperboard and pulp under indoor sunlight conditions.

This standard applies to white and nearly white paper, cardboard and pulp. When testing samples containing fluorescent whitening agents, use a fluorescent reference standard

The test can only be carried out when the ultraviolet (UV) radiation energy level of the instrument is adjusted to be consistent with the CIE illuminator C. C light source

There is a certain proportion of UV content, which is equivalent to indoor sunlight conditions.

Note. The brightness of D65 is tested by adjusting the instrument to comply with the CIE standard illuminating body D65.

Much higher. The test method standard of D65 brightness is GB/T 7974.

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 reference documents, the latest version (including all amendments) is applicable 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)

The collection of GB/T 740 pulp samples (GB/T 740-2003, ISO 7213.1981, IDT)

Preparation of GB/T 8940.2 pulp brightness (whiteness) sample (GB/T 8940.2-2002, eqvISO 3688.1999)

GB/T 10739 Standard atmospheric conditions for handling and testing of paper, paperboard and pulp samples (GB/T 10739-2002, eqvISO 187.

1990)

ISO 2469 Determination of diffuse reflectance factor of paper, paperboard and pulp [Paper,boardandpulps- Measurementofdif- fuseradiancefactor(diffusereflectancefactor)]

ISO 4094.Appointment and acceptance of international calibration laboratories and authorized laboratories for paper, paperboard and pulp testing instruments (Paper,boardandpulps-Internationalcalibrationoftestingapparatus-Nominationand acceptanceofstandardizingandauthorizedlaboratories)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Diffuse reflection factor

The ratio of the radiation reflected and excited by an object to the reflection of a fully reflective diffuser under the same light source and viewing conditions.

Note 1.The diffuse reflection factor is expressed as a percentage.

Note 2.If the object is translucent, the diffuse reflection factor is affected by the backing.

Note 3.This standard specifies the light source and observation conditions of the instrument after calibration in accordance with the relevant provisions.

GB/T 40166 | GB/T 40167 | GB/T 40168 | GB/T 40272 | GB/T 40269 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 186 · ISO 7213.1981 · ISO 2469 · ISO 4094

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