Method and device for quickly detecting fluorescent whitening agent of paper and paper board

Abstract

The invention relates to a method and a device used for rapidly detecting paper and fluorescent whitening agent in a paperboard. The method includes the following steps. Firstly, ultraviolet light, the wave length of which is bigger or equal to 244nm but smaller or equal to 375 nm, is used to irradiate directly on a matter to be detected. Then the next step is to observe that whether the mater to be detected is provided with purple or blue white fluorescence or fluorescence reflection points. If the matter to be detected is equipped with purple or blue white fluorescence or fluorescence reflection points, the matter contains fluorescent whitening agent. If not, the matter to be detected contains no fluorescent whitening agent. The device includes a base. And a stent extends from the base. The stent is equipped with a light source, which can emit the ultraviolet with the wave length. The detection test result proves that the fluorescence detection device has the advantages of low cost, high detection sensitivity, visual and practical performances, accurate and reliable result and convenient and rapid use.

Description

Technical field [0001] The invention relates to a method and a device for quickly detecting fluorescent whitening agent in paper and cardboard. Background technique [0002] Paper and cardboard are commonly used daily necessities. With the improvement of people's living standards, their production and consumption are increasing. Fluorescent Whitening Agent (FWA) is a whitening agent widely used in the paper industry. It is a colorless organic compound and the main component is stilbene. It can not only reflect visible light, but also It absorbs ultraviolet light with a wavelength of 230nm-400nm, and usually has the maximum absorption at about 350nm, and emits blue or blue-violet visible light with a wavelength of 400nm-500nm. Adding this blue-violet light-emitting substance to paper or cardboard and other materials will "cover" the yellow that is seen by the naked eye and present a pleasing white. Because the fluorescent whitening agent itself is colorless or light-colored, and i...

AI Technical Summary

Problems solved by technology

This detection method is generally measured by a reflectance photometer in a professional laboratory. The instrument is generally not easy to obtain, the operation is also complicated, and the measurement time is long. It is difficult for ordinary consumers to obtain and master it.

At the same time, due to the measurement error of the instrument itself, it is generally necessary to stipulate that the whiteness difference reaches a certain level (usually greater than +1%) before it can be qualitatively judged. When the content of fluorescent whitening agent is small, it is difficult to measure and accurately express the degree of fluorescent whitening, resulting in inaccurate test results

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