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Application of Spectrophotometer in color measurement of plastic industry

Author:CHNSpec technology

With the continuous development of China's economy, plastics are needed in many aspects of modern industry. With the continuous maturity of technology and the improvement of people's consumption requirements, the requirements for color diversity and accuracy are becoming higher and higher in the plastic industry, whether industrial products or daily necessities.
Plastic is widely used. It is an indispensable component in household appliances, automobiles, mobile phones, PCs, medical devices and lighting appliances. In recent years, China's economy has achieved sustained growth. Industries such as home appliances, automobiles, mobile phones, PCs and medical devices have benefited from a good external environment and developed rapidly. The development of downstream industries has further boosted the demand for plastics.
The spectrophotometer has two modes of SCI and SCE, which can remove the gloss measurement and be more consistent with the feeling of the human eye (SCI: refers to the expression method of measuring the color including the specular reflection light. SCE: refers to the method of measuring the color excluding the specular reflection light; excluding the specular reflection light). The application of the spectrophotometer in the plastic industry is very common.



The common color difference instrument of CIE space is lab. CIE LAB color space uses L value to represent the lightness of color, a value to represent the red and green value of color, and b value to represent the blue and yellow value of color. It doesn't have much practical significance to judge a color only by a group of lab values, but when we compare two colors, we can judge the difference between them through the lab difference between the two colors. Generally, three groups of data of L, a and B and four groups of color difference data of △ e, △ L, △ A and △ B after color comparison will be output. The total color difference of △ e, △ L + indicates partial brightness, △ L - indicates partial darkness, △ a + indicates partial red, △ a - indicates partial green, △ B + indicates partial yellow and △ B - indicates partial blue.




Colorful plastic products enrich our colorful life. Color has become an important evaluation factor of plastic products. In the production of plastic products, due to the reasons of raw materials, raw material mixing and production technology, there will be obvious color differences in the same or different production batches of plastic products. The color difference of plastic parts directly leads to the decline of the overall appearance quality of products, which affects the quality of finished products. Due to the large color difference of supporting products, the plastic parts are scrapped in batches, which greatly increases the production cost of the enterprise. By using the lab color space of spectrophotometer, we can realize the digitization in the production of plastic industry. By quantifying the color, the comparison and analysis become simple, the operation is simple, the precision is high, and the automatic correction is very practical and worry-saving. It can improve work efficiency and reduce production costs.

At present, cs-410 series products of CHNSpec technology on the market have high precision and stable data in testing plastics. Have the ability to pass the national level measurement certification; More than 30 measurement indexes such as yellowness (ASTM d1950,,), whiteness (CIE / ISO,,,), and 26 light source evaluation indexes such as a, C and D50; SCI / sec dual-mode switching and other characteristics.

Plastic products can be seen everywhere in life, and the demand for quality is higher and higher. A high-performance and high-quality color difference instrument can easily solve your color measurement problem!

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