Production of each dye fabric UV absorption properties of UVR varies due to structural , fabric UPF values ??can produce different effects . In order to obtain visible color , dye must absorb visible radiation to selectively (400 ~ 800nm), all the dye carrier extends to UVR absorbing region of the spectrum (280 ~ 400nm), thus UVR absorber dye can play the role of a potential absorption harmful UVR rays. Dyes UVR spectral region sorrow less coefficient UPF fabric will determine its ability to improve .
About dyed fabric for UPF numerous studies on the impact that the ratio of dyed fabrics dyed fabrics have a high UPF value , and with the deepening of the fabric color , fabric UV transmittance decreases , ie, u.v fabric radiation performance improvement . Polyester products made ??in conventional tests , the same type of the color to be ultraviolet radiation transmittance of the order from small to large : black transmittance of 5% , dark blue , red, dark green , violet transmittance of 5% ~ 10% , green, pink , light green, white transmittance of 15% to 20%. As the dye color is the dye molecular structure reflection absorption characteristics of the visible spectrum , only certain absorption spectra of dye molecules and chemical fibers extending light extinction process also affect the ultraviolet radiation transmission characteristic .
The color of the dye is determined absorption characteristics in the visible region , and the absorption characteristics of the UV region has little effect on the color .
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