Modern hot stamping technology primarily utilizes the principle of thermal transfer to transfer the aluminum layer from a hot stamping foil onto the surface of a substrate. Hot stamping foil typically consists of a base film layer, a release layer, a color coating, a metallic coating, and an adhesive layer. The fundamental parameters of hot stamping include temperature, pressure, and dwell time; the heating plate temperature on a flatbed hot stamping machine is approximately 110°C, while that on a rotary hot stamping machine ranges from 140°C to 150°C.
The appropriate type of hot stamping foil must be selected based on the specific substrate being used; for paper products, Type 8 foil is commonly employed. Hot stamping dies are typically made of copper, zinc, or resin, with copper dies offering the highest precision. The hot stamping workflow encompasses preparation, die mounting, underlaying, parameter adjustment, test stamping, sample approval, and the final production run. Hot stamping methods are broadly categorized into hot stamping and cold stamping; hot stamping itself includes techniques such as standard flat stamping, dimensional stamping, and holographic registered stamping. The quality of the hot stamping result is influenced by a multitude of factors, including the characteristics of the substrate, the quality of the hot stamping foil, the quality of the stamping die, and the condition of the printed ink layer.