Whiteness meter

LB-48B is the first in the paper industry development of whiteness measurement equipment, can also be used to measure the whiteness of other materials, such as flour, talcum powder, plastic and ceramic materials, instrument to simulate the D65 light source, diffuse lighting / vertical observation conditions, internal reflection factor material on the main wavelength of 457nm blue light (%) said brightness (whiteness) determination results.

Test function

Determination of ISO whiteness (ISO, Brightness, R457 white), fluorescent whitening of the sample, you can also determine the fluorescence of fluorescent substances emitted brightness.

Determination of lightness stimulus

Determination of opacity

Determination of transparency

Determination of light scattering coefficient and absorption coefficient

Measuring ink absorption value

Product features

The instrument is novel in appearance, compact in structure and advanced in circuit design, which effectively ensures the accuracy and stability of measurement data.

It adopts ultraviolet light, rich analog D65 light source, illumination diffused ball diameter 150mm, test hole diameter 30mm (19mm), equipped with light absorber to eliminate the influence of mirror reflection light of sample.

The instrument has power off protection, the calibration data will not be lost after power failure.

With large screen and high pixel LCD module, the Chinese display and prompt operation steps display measurement and statistical results, friendly man-machine interface, simple and convenient operation.

The instrument has increased the printer and imported thermal printer, without the use of ink and color characteristics, when no noise, fast printing speed; the instrument is equipped with a standard RS232 interface, can communicate with computer software.

Technical index

Resolution: 0.1

Measuring range: (1~160)%

Accuracy: the R457 ≤ 0.5, Y ≤ 1.0,

Zero drift: less than 0.1%

Indication: drift less than 0.1%

Error: less than 0.5%

Repeatability error: less than 0.1%

Specular reflection error: less than 0.1%

The diameter of integrator is 150mm, and the diameter of test hole is 30mm

Sample size test plane diameter is not less than Phi 30mm (or Phi 19mm), the thickness is not more than 40mm

Test description

With uniform sampling equipment from samples cut from standard samples, such as the measurement of whiteness, a specimen is placed on the test hole, R457 test of the top layer of sample diffuse blue reflectance factor, the top of the layer on the bottom of the stack of paper samples, repeat the test second samples, and then use the same method in turn determination of not less than 5 samples. If you want to test the reverse, then fold the paper and repeat the operation.

Note: 1., 30 minutes after the start of the instrument stable, the test before the standard board to calibrate the instrument, if not in the error range, domestic calibration.

2. different test items shall be carried out according to the test requirements specified by the relevant standards.

Applicable standard

GB/T7974 determination of brightness (whiteness) of paper, board and pulps (diffusion / vertical)

GB/T7973 paper, board and pulps diffuse reflectance factor (diffusion / vertical method)

ISO2469 paper, board and pulps -- Determination of diffuse reflectance factor

ISO2470 paper and paperboard - Determination of whiteness (diffusion / vertical)

ISO2471 paper and board - Determination of opacity (paper backing) - diffuse reflectance method

ISO9416 paper light scattering and determination of light absorption coefficient (Kubelka-Munk)

GB/T8940.1 paper and board Determination of whiteness (45/0 directional reflection method)

GB/T2679 "determination of paper transparency"

GB/T1543 - Determination of opacity (paper backing) of paper and paperboard (diffuse reflectance)

GB/T10339 - Determination of light scattering and light absorption coefficients of paper, paperboard and pulps

GB/T12911 paper and board Determination of ink absorbency

GB/T9338 method for the determination of relative whiteness of fluorescent brighteners

GB/T2913 "test method for whiteness of plastics"

GB/T13025.2 -- General test method for salt making -- Determination of whiteness

GB/T5950 methods for measuring whiteness of building materials and non-metallic minerals

Device parameter

Chinese measurement and control LCD screen life: about 50 thousand hours

Power supply: AC220V + 22V 50Hz 0.5A should be reliably grounded

Overall dimensions (L * w * h): (330 * 264 * 400) mm

Net weight: 20kg

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Whiteness Tester