Generally, the white products obtained by traditional process (such as bleaching, adding blue) will not be very ideal whiteness, even a little yellow.It feels like the product is not brand new. Why this happening?
This should be explained from the mechanism of human eye color recognition:
When light hits an object, one of the wavelengths of light is absorbed and the rest is reflected.Strictly speaking, the colours we perceive to the eye are that of reflected light.In other words, "Seeing is not believing."!
The wavelength range that the human eye can see is from 400nm - 700nm, also known as the visible band. Therefore, the key to adjust the whiteness of the product is to adjust the color of reflected light in the visible band.
Red, blue and yellow are called primary colors, and when the two colors of light mix to produce white, the two colors are called complementary colors.
White products, such as fiber and pulp, tend to absorb some of the Blue-violet light of sunlight,then reflect yellow light. So we need to adjust the optical balance by supplementing the missing Blue-violet light.
In order to make the fiber and pulp objects white, adding Optical Brightener into the product is the most ideal modification method.
Optical Brighteners can absorb part of the UV ray and convert it to visible fluorescence near 440nm, to supplement the insufficient reflection of the fiber. It whitens and brightens the product through this optical principle. And the visual color effect of the product will be more perfect. Especially under the UV light, its whitening effect is better.
Optical Brighteners have been widely used in plastics, printing and dyeing, paint and paper industry.
According to its solubility, Optical Brightener is divided into oil soluble and water soluble, oil soluble Optical Brightener is generally used in plastic products, paint ink industry. Sich as OMNISTAB OB, OMNISTAB OB-1, OMNISTAB KCB, OMNISTAB FP-127, OMNISTAB KSN, OMNISTAB KSB etc. Water-soluble Brighteners are commonly used in Paper and Household Chemical industries.The commonly used brightener is OMNISTAB CBS.
If you are interested, welcome to contact our sales staff. Deltachem(Qingdao) Co., Ltd. sincerely looks forward to your inquiry!
