GB/T 33876-2017Method for measuring gloss uniformity of image on colour copied pages (English PDF)
彩色复印品图像光泽均匀性的检验方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
July 12, 2017
Implementation date
February 1, 2018
Scope
GB/T 33876-2017 is the English-translated version of 彩色复印品图像光泽均匀性的检验方法.
GB/T 33876-2017 gives the method for measuring how evenly gloss is spread over an image on a colour copied page, at the three geometries of 20°, 60° and 75°.
The measurement is made with a gloss meter: light is thrown onto the printed surface at the chosen angle to the normal and the light reflected into a specified aperture at the matching angle is read off the meter.
It applies to colour copies made by electrostatic imaging, and colour printed products may follow it for reference. The 20° and 75° meters are to meet GB/T 8941-2013 and the 60° meter GB/T 9754-2007, and the standard repeats the definition of gloss from GB/T 8941-2013, with polished black glass of refractive index 1.567 taken as 100 gloss units. It was issued on 12 July 2017 and has applied since 1 February 2018.
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Document preview — GB/T 33876-2017
National Standard of the People's Republic of China
- ICS
- 37.100.01
- Classification
- N 47
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Definition of terms
- 4 Principle
- 5 Instruments and devices
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the color copy of the image at 20 °, 60 ° and 75 ° under the geometric conditions of the uniformity of the test method.
This standard applies to electrostatic color imaging of the copy. Color print reference to use.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 8941-2013 Paper and board - Determination of specular gloss
GB/T 9754-2007 Paints and varnishes - Determination of specular gloss at 20 °, 60 ° and 85 ° for metallic paint-free paint films
3 Definition of terms
GB/T 8941-2013 defined and the following terms and definitions apply to this document. For ease of use, the following list is repeated GB/T 8941-2013 some of the terms and definitions.
3.1 Gloss
The direction of the surface of the object to select the nature of the reflection, which determines the nature of the surface can be seen in the strong reflection of light or object mirror Like the degree. [GB/T 8941-2013, Definition 3.1]
Note 1: The gloss is expressed as 100 times the ratio of the luminous flux reflected by the sample surface to the specified aperture and the luminous flux reflected by the standard mirror under the same conditions.
Note 2: An image with a high specular reflection on the front surface is considered to have a high gloss, whereas an anterior surface is more specular on the image being considered as low gloss degree. The gloss value will vary depending on the measurement method (eg, glossmeter measurement angle and sampling area size) and the level of gloss in the region of interest And different.
Note 3: GB/T 8941-2013 provides that the refractive index of 1.567 polished black glass as a gloss benchmark, assuming that the plane in the ideal polishing State, from the plane of the natural beam of the mirror reflection, the definition of the gloss value of 100 gloss units.
Note 4: Definition of GB/T 9754-2007 3.1 The specular gloss is "To determine the specular gloss scale, a polished black glass with a refractive index of 1.567 The specular gloss value of 100 given the geometrical conditions of 20 °, 60 ° and 85 °. "
4 Principle
With the gloss meter determination and the normal line of the copy at an angle (20 °, 60 ° and 75 °) incident on the printed surface, and from the printed surface and the normal The light reflected to the specified aperture at the corresponding angles (20 °, 60 ° and 75 °) is displayed on the gloss meter.
5 Instruments and devices
5.1 Optical system
20 °, 75 ° gloss meter should meet the technical requirements of GB/T 8941-2013, 60 ° gloss meter should be consistent with GB/T 9754-2007
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 8941-2013 — Paper and board -- Measurement of specular gloss
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