GB3978 Whiteness Tester

GB3978Whiteness Meter

Product Model: BG-48

I. Purpose

This instrument is primarily used to measure the whiteness of various materials such as paper and paperboard, pulp and chemical fiber pulp, cotton and chemical fibers, textiles, plastics, ceramics, enamel, starch, table salt, white cement, kaolin, talcum powder, etc. It can also measure the optical properties of thin sheet materials, including opacity.

1. Measure the blue diffuse reflectance factor (R457) of the sample, referred to as "blue light whiteness" or "ISO Brightness".

2. Analyze whether the sample material contains fluorescent whitening agents and measure the fluorescent whiteness generated by fluorescence emission, i.e., the degree of whitening.

3. Measure the luminance stimulus value Y10 of the sample, i.e., the green light diffuse reflectance factor Ry.

4. Measure the opacity, transparency, light scattering coefficient, and light absorption coefficient of the sample.

5. Measure the ink absorption value of paper and paperboard.

II. Main Technical Features

1. This instrument complies with GB3978; standard illuminants and illumination observation conditions. It simulates D65 illuminant lighting. It adopts d/o illumination observation geometry conditions, with a diffuse sphere diameter of 150mm, a test aperture diameter of 30mm, and is equipped with a light absorber to eliminate the influence of specular reflection from the sample. The spectral power distribution of the R457 whiteness optical system has a peak wavelength of 457nm and a half-bandwidth of 44nm. The Y10 optical system complies with GB3979; methods for measuring object color.

2. Measure and digitally display whiteness, fluorescent (whitening) whiteness, opacity (%), etc.

3. Zero drift: ≤0.1

4. Indication drift: ≤0.1

5. Indication error: ≤0.5

6. Repeatability error: ≤0.1

7. Specular reflection error: ≤0.1

8. Sample size: test surface not less than Φ30mm, sample thickness not exceeding 40mm

9. Power supply: AC 170~264V, 50Hz, 0.2A

10. Operating environment: temperature 0～40℃, relative humidity not exceeding 85%

Standard configuration: Main unit + standard whiteboard + comparison board + blackboard + powder container