The multi-layer reflective plastic composite rainbow film is a plastic composite film in which two or more resins with different refractive indices are melt extruded and stacked in intervals of up to 100 layers, each having a thickness of only several hundred nanometers, that is, each The thickness of the layer film corresponds to the light wavelength of the light to be reflected. The 200-layer film has a thickness of 0.02 mm. When visible light passes through the interface of each layer, weak reflection and interference occur. If the thicknesses of the layers of the 100 multi-layered thin film we make are basically the same, the wavelengths of light reflected by each layer will be superimposed on the same wavelength, and if there is a positive interference, the composite thin film will appear. Colorful rainbow effect. The multi-layer composite plastic rainbow film with high technical content and high added value prepared from the raw materials is a popular high-end decoration and decorating material in recent years, and is widely used in packaging, printing and other fields. This production technology has been monopolized by the only three companies in the world, and the country has always relied on imports.

After several years of research and development, the Institute of Light Industry Plastics Processing and Applications has completed the study of multilayer optical structure design, lamination process, equipment design and experimental research. Completed a series of technical problems from the laboratory test to the production line to amplify the industry, successfully solved the design and processing transformation of the key parts mold and production line in the preparation of the rainbow film, completed the formula design of the polymer material of the optical structure layer, and various materials The smooth flow control of the layer and the formation, shaping and production of a series of key technologies for a homogeneous product, and the formation of a rainbow film processing technology with independent intellectual property rights.

Reproduced from: China Plastics Additives Network