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Cold stamping technology offers a more efficient alternative to traditional hot stamping, addressing several common challenges such as poor printability, difficulty in controlling stamping parameters, and limited graphic complexity. Unlike conventional hot stamping, which often results in low productivity and single-image formation, cold stamping enables the simultaneous printing and hot-stamping process. This makes it ideal for various substrates like thermal paper, self-adhesive materials, and films, providing greater flexibility in application.
However, cold stamping has its own limitations. The adhesion of the aluminum layer transferred to the substrate is generally weaker compared to hot stamping. To ensure durability, the stamped pattern typically requires protection through surface coating or film lamination. Additionally, due to the nature of the cold stamping process, defects such as missing small dots, uneven gradients, or stencil-like effects may occur. These issues require careful attention during operation.
To improve the quality of cold stamping, it's recommended to use a flexographic plate with higher hardness and deeper etching. Reducing the peeling angle of the cold foil during winding can help achieve better graphic reproduction. When working with small dots or gradient patterns, a harder flexo plate should be used to ensure sharp and complete details, minimizing defects like missing dots or inconsistent gradients. It’s also important to regularly check the UV light source and maintain the reflector’s cleanliness. Using UV adhesives with high solid content ensures strong bonding between the cold foil and the substrate.
The laser imprint transfer process involves applying a layer of UV varnish onto the substrate surface. Under pressure, the laser pattern from the embossed transfer film is transferred to the substrate and then cured using UV light. This results in a brilliant, laser-like finish that closely resembles the original pattern on the transfer film.
To enhance the gloss of the laser imprint, you can increase the viscosity of the UV varnish by selecting a higher-viscosity formula or adding an appropriate amount of UV thickener. Using slightly purer ethanol can also improve the final appearance. However, it’s crucial to control the ethanol quantity carefully to avoid negative effects on the finish.
To address issues like spotting or fading in the laser transfer pattern, maintaining proper drying conditions for the UV coating is essential. Controlling the viscosity of the UV varnish, adjusting the cell parameters of the anilox roll, and frequently checking the UV curing effect will help ensure even coating. This prevents problems like uneven coverage, which can lead to imperfections in the final product.
This information is adapted from the second edition of *Printing and Printing Technology* (2012), published in the journal *Packaging and Decoration*. For more detailed content, please visit the journal section.25-40pcs Makeup Brush Set are special professional Makeup Brush set, which can meet the needs of professional makeup artists for large-scale stage beauty makeup brush. The 32pcs makeup brush set and belt makeup brush set are the most chosen by makeup artists as professional ones. we are makeup brush manufacturer factory, we can customize makeup brush set for you
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