Fluorescence, also known as "fluorescence", refers to a cold luminescence phenomenon of photoluminescence. When a substance at room temperature is irradiated by incident light of a certain wavelength (usually ultraviolet or X-ray), it enters the excited state after absorbing light energy, and immediately de excites and emits outgoing light longer than the wavelength of incident light (usually in the visible light band); Moreover, once the incident light is stopped, the luminescence phenomenon disappears immediately. The outgoing light with this property is called fluorescence. In daily life, people usually call all kinds of weak light fluorescence in a broad sense, without carefully investigating and distinguishing its luminescence principle. Fluorescence is widely used in biochemistry and medicine. People can stick fluorescent chemical groups to biological macromolecules through chemical reaction, and then sensitively detect these biological macromolecules by observing the fluorescence emitted by tracer groups.
Let's see how to distinguish non-woven fabrics by fluorescence method:
Fluorescence method:
The non-woven fiber is irradiated by ultraviolet fluorescent lamp. The non-woven fiber is identified according to the different luminescent properties of various non-woven fibers and the different fluorescent colors of non-woven fibers. The fluorescent colors of various non-woven fibers are shown in detail:
(1) , cotton and wool fiber: light yellow
(2) Mercerized cotton fiber: light red
(3) Jute fiber: purple brown
(4) , jute, silk and nylon fiber: light blue
(5) Viscose fiber: white purple shadow
(6) Light viscose fiber: light yellow and purple shadow
(7) . polyester fiber: white light and blue sky light are very bright
(8) . vinylon light fiber: light yellow and purple shadow.