Optical Properties Of Stretched-wound Films

The products of stretch winding film manufacturers are a common kind of logistics packaging materials, and the requirements for it are very high, in order to ensure the bright and beautiful packaging items. In terms of optics, one of the important aspects is the degree of fog, which is the ratio of the scattered and projected light flux that deviates from the direction of the incident light through the stretch film, indicating the clarity and transparency of the transparent material. The fog degree is related to the inherent properties of the stretch film material and the additives used. And then transparency, and for opaque stretch film, such as white film, it requires high whiteness and good opacity. Another point is glossiness, which indicates the degree of flatness and smoothness of the stretch film surface, which can be determined by the ability to reflect light.
In addition, stretching and winding film packaging can make the packaged items evenly stressed to avoid damage caused by uneven stress, which is impossible to do with traditional packaging.