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Cold stamping application trends and frequently asked questions
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Cold stamping has become a widely used surface decoration technique in the daily chemical industry, offering a high-quality metallic effect that significantly enhances product visibility on shelves. This innovative method not only adds visual appeal but also enriches everyday life with more vibrant and attractive packaging options.
(1) Advantages of Cold Stamping
Compared to traditional hot stamping, cold stamping offers greater flexibility and efficiency. It overcomes issues such as poor adaptability, difficulty in process control, and limited design expression—especially when it comes to intricate images and thin lines. Additionally, it reduces production cycle constraints and allows for seamless integration with printing processes, enabling label manufacturers to deliver "one-stop" solutions for daily labels. The common application methods include “printing + cold stamping,†“cold hot stamping + printing,†and “printing + cold stamping + printing.†This versatility makes the final product more artistic and visually appealing.
1. Flexible Design Options
Cold stamping involves using pre-printed UV adhesives combined with hot stamping foil technology. It can be applied through conventional printing techniques like flexography, embossing, and offset printing. This allows for enhanced visual expression, making it possible to achieve fine details, precise lines, and even complex mesh patterns. Printing ink on top of the stamped pattern or beneath it creates unique visual effects, giving the label a striking metallic finish.
2. Cost-Effective and Environmentally Friendly
Unlike hot stamping, cold stamping doesn’t require expensive specialized equipment or metal dies. It works with standard printing and laminating units, reducing capital investment for label printers. It also eliminates the need for metal plate production, avoiding the chemical corrosion process that is both time-consuming and environmentally harmful. This results in faster plate-making, shorter production cycles, and lower resource consumption.
3. Suitable for Film Adhesive Materials
Many high-end daily-use labels now use film adhesive materials. Cold stamping operates at lower temperatures (typically between 40–50°C), making it ideal for applying metallic finishes on these delicate surfaces without damaging them. This makes it a preferred choice for modern label manufacturing.
4. High Production Speed
Cold stamping can reach speeds of up to 60–100 meters per minute, which significantly boosts production capacity. For label printing companies, this means higher output and reduced costs, making it a highly efficient process.
(2) Common Issues and Solutions in Cold Stamping
Cold stamping can be applied using various printing methods such as gravure, flexo, and offset. Here, we'll focus on flexographic printing as an example and discuss some key considerations during the process.
1. Incomplete or Blurred Hot Stamping Patterns
One common issue is incomplete patterns, missing text, or blurred lines, which can occur due to improper pressure, ink viscosity, or alignment problems. These challenges are crucial to address when applying cold stamping to label surfaces.
(1) Hot Stamping Pressure
Cold stamping is a high-precision process. Even with normal pressure, the width of the pattern, characters, and lines can reach 0.1 mm. If the pressure is too high, it may cause the stamped elements to appear thicker than intended, leading to misalignment or overprinting issues. Proper pressure control is essential to ensure sharp and accurate results.
(2) Ink Compatibility
The type of ink used in the printing stage must be compatible with the hot stamping foil. Incompatible inks can lead to poor adhesion or uneven coverage, affecting the overall quality of the finished label.
(3) Surface Preparation
The surface of the label must be clean and properly treated before cold stamping. Any dust, oil, or residue can interfere with the adhesion of the foil, resulting in a dull or inconsistent finish.
In summary, cold stamping is a versatile, cost-effective, and environmentally friendly method that brings a new level of sophistication to daily label design. By understanding its advantages and addressing common challenges, label manufacturers can fully leverage this technique to create eye-catching and high-quality products.