Paper Whiteness Tester

Product Model: BD-48

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

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

3. Measures the brightness stimulus value Y10 of the sample, i.e., the green diffuse reflectance factor Ry.

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

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

Main Technical Features:

1. This instrument complies with GB3978-83; standard illuminants and illumination observation conditions. It simulates D65 illuminant illumination. It uses d/o illumination observation geometry, 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 GB3979-83; methods for measuring object color.

2. Measures and digitally displays whiteness, fluorescence (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 plane 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 white plate + comparison plate + black plate + powder container