Rice chalkiness observation instrument

The rice chalkiness observation instrument is made of high-quality components and materials, and its main detection object is polished rice. During testing, the size and degree of rice chalkiness can be clearly reflected, which is beneficial for inspectors to make accurate judgments. This machine has the advantages of light weight, reasonable structure, beautiful appearance, stable brightness after startup, and the operator is not easily fatigued after working for a long time. A small funnel is specially designed for sample collection. This instrument is not only suitable for scientific research and teaching, but also for evaluating and inspecting the quality of rice in production, processing, and marketing.

Technical Description:
1. Indication error: ≤ 2.5
2. Repeatability:<0.3
3. Stability: ≤ 0.5
4. Instrument light source: 12V 30W tungsten halogen lamp
5. Working power supply: AC220V ± 10% 50Hz
6. Working power: 40W

Measurement method
1. Chalk grain rate: Randomly take 100 samples from whole polished rice and place them on a milky white board for observation. Pick out rice grains with chalkiness (including heart white, belly white, and back white) and calculate the percentage of chalky rice according to the formula. Repeat once and take the average of the two measurement results to obtain the chalky grain rate. Chalk grain rate=number of chalky grains/total grains * 100
2. Chalk size: Randomly select 10 chalky grains and place them flat on a milky white board. Visually measure the percentage of chalky area per grain to the total grain area, and calculate the average chalky area. Repeat once and take the average of the two measurement results to obtain the chalkiness size.
3. Chalkiness degree: Chalkiness degree refers to the percentage of chalky area in the whole polished rice sample to the total sample area. The chalkiness degree is calculated according to the formula: chalkiness degree=chalkiness grain rate/chalkiness size