How does foaming cotton turn yellow to do???

Foam cotton is a kind of material containing pores, such as polystyrene foam board, polyurethane foam, sealant pad, etc. its products have independent bubble structure, low density, good flexibility, easy processing, high and low temperature resistance, weather resistance and aging resistance. Foam cotton has many advantages, and the product price is low, so in the field of packaging, foam cotton is favored by the majority of consumers.

 

Foam cotton is mainly to prevent product damage, the appearance of white. However, as we all know, foam cotton used in the field of packaging is mostly disposable products. In order to reduce costs and earn more profits, manufacturers generally do not choose brand-new materials in production, but choose to use recycled materials for production. Although the quality of production without recycled materials is not inferior to that of new materials, there is still a gap between the appearance whiteness and that of new materials. At this time, we need to use a whitening agent to improve the whiteness of products. Why add fluorescent whitening agent foam cotton white, this also need to start from the whitening principle of fluorescent whitening agent. The whitening of fluorescent whitening agent is an optical complementary color, which can absorb the invisible light into blue or blue purple visible fluorescence. This fluorescence combines with the yellow light of the natural color of the article to form white light. In this way, we can see that the appearance of foamed cotton with fluorescent whitening agent can be white even if it is recycled.

 

Which fluorescent brightener is suitable for foamed cotton? Most of our common foamed cotton are soft and disposable products. According to some performance characteristics and use environment of foamed cotton, Shanghai enmai recommends to use fluorescent brightener 127, which is used on foamed cotton with good whiteness and small dosage. Generally, the recommended dosage is 3 / 10000, and the whiteness of the product will be greatly improved,