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**China Aluminum Industry Network**
Hot stamping is a crucial process in ensuring the quality of stamped products. Currently, the production of hot stamping plates primarily uses photo-etching and electronic engraving technologies. Common materials include copper or zinc plates. Copper plates are more delicate, offer better surface finish and heat transfer performance compared to zinc plates. Using high-quality copper plates can enhance the gloss and definition of the embossed graphics.
Traditional photo-etching technology simplifies the process and reduces costs, making it ideal for text, thick lines, and general images. However, for finer details, uneven thickness, or complex designs, second-stage etching or electric carving techniques are required. Electric carving allows for rich and detailed tonal variations, improving packaging aesthetics and being more environmentally friendly. However, it requires significant equipment investment and currently has limitations in depth control, which may lead to issues like "sticking" during hot stamping.
Holographic anti-counterfeit hot stamping involves higher technical requirements. Previously, this was mainly produced in Taiwan or abroad, with long plate-making cycles and limited use for large-volume, fixed-product packaging. Recently, some manufacturers in Yuncheng, Beijing, and Shanghai have started producing such plates.
Choosing the right hot stamping equipment is essential for achieving high-quality results. There are three main types of machines: flat pressing, round flat pressing, and round pressing. Flat pressing machines, such as the TYM series from Shanghai Yahua, the TYMl020 from Tangshan Yuyin Group, and the MK series from Tianjin Ever Machinery, offer high speeds up to 5,000 per hour. Round presses, like the German Stoll FOLLJETFBRl04, operate at even higher speeds—up to 10,000 per hour—and are designed with an offset press concept. Each type of machine has its own advantages: round presses are efficient for large-area gilding but come with higher production costs and heating challenges. Flat presses are more flexible and suitable for short runs. While domestic machines are cost-effective, imported models like BOBST offer superior precision, stability, and durability, making them preferred by high-end packaging industries.
The suitability of hot stamping depends on factors such as the model, speed, temperature, and pressure. Proper control of these variables is key to enhancing the quality of the final product. For example, surface contaminants like dust or release agents can hinder aluminum adhesion, so cleaning or adjusting the printing process is necessary. The choice of electro-aluminum also matters—domestic options like Shenyong’s Peacock series, and international brands like Kurtz (PM, LK), Japan’s A, K, H series, and South Korea’s KO series are commonly used. Matching the right material to the substrate and application is critical for optimal results.
Issues like peeling, discoloration, or unclear outlines often arise due to improper settings or material mismatches. Solutions include ensuring proper drying before stamping, using low-separation aluminum, and adjusting temperature and pressure accordingly. Additionally, improper lamination or adhesive use can damage the metal finish, so careful process planning is essential.
In summary, high-quality plates and precise control over hot stamping parameters are vital for achieving excellent results. Hot stamping, also known as electro-gilding, relies on transferring aluminum layers from foils onto substrates, creating striking metallic effects. With various gold and silver foil options available, including laser and colored varieties, the technique continues to evolve in the printing industry.
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