Erythema effect:
After being subjected to strong ultraviolet radiation, the epidermis will generate various chemical mediators and release and diffuse to the dermis, causing local blood vessel dilation, which is manifested by the appearance of erythema on the skin. Medical research has found that, unlike erythema caused by burns, erythema caused by ultraviolet radiation disappears very slowly. Although scientists have not fully explained the mechanism of the erythema effect, there is a unified understanding of the upper limit of the erythema effect, that is, near 310 nm, that is, the erythema effect is the UVB band ultraviolet radiation effect in the ultraviolet aging test chamber .
Photosensitive effect:
Photosensitive effect, also known as photochemical effect, refers to the phenomenon that certain substances will decompose, polymerize and metamorphose under ultraviolet irradiation. The sensitive radiation band of photosensitivity is mostly located in the A band. In recent years, the field and scale of the application of photosensitivity have been expanding, and a considerable scale has been formed in industrial applications. For example, in high-speed printing, especially high-quality printing such as high-end decoration, photo-curable inks are increasingly used. The principle is that the ink contains materials that can be rapidly cured under ultraviolet radiation, and the printed matter does not need to be baked after printing. Only need to be exposed to ultraviolet light. In this way, not only the printing speed is greatly improved, but also because the ultraviolet radiation does not contain heat, the influence of thermal energy on the printed matter is avoided.
Fluorescence effect This is a phenomenon in which fluorescent substances emit light in the long wavelength band after short-wave ultraviolet rays are irradiated on the fluorescent substances. The fluorescent effect of the ultraviolet aging test box is not only one of the most important effects in the ultraviolet radiation effect, but also its widest application range, and even penetrates into our daily life.
PE plastic valve pocket as the dominant packaging of our factory, the ion resin, TPU resin, calcium chloride, carbon black, formic acid, and some pharmaceutical intermediates such USES mostly high value-added chemical packing. The product, besides has the characteristics of the Pp Woven Bags has its printing more beautiful, generous. In addition, anti-slip lines can be added to increase the friction between the bag and the palletizing height. And recycling is particularly valuable. More environmentally friendly.
Pe Valve Bags,Pe Woven Valve Bag,Plastic Pe Valve Bag,Pe Valve Packing Bags
Shenzhen Riversky Packing Materials CO.,LTD , https://www.jtfibc.com