1. The pre-press design requirements for self-adhesive labels are crucial to ensure high-quality printing results. First, it's essential to understand the entire production process and technological route. This helps in making informed decisions during the design phase. When it comes to color application, spot colors should be used to complement four-color printing, especially when vibrant or specific hues are needed. The overall color scheme should remain simple and clear to avoid visual clutter. Additionally, bright tones and solid areas should be separated into different plates for better control and clarity.
2. It's important not to use lines that are too thin or text that is too small, as these can become blurred or illegible during the printing process. The mid-tones should be emphasized to maintain a balanced look, while the highlights and shadows should be kept relatively flat to prevent loss of detail. When arranging the layout for printing, the direction of markings and the placement of labels must be carefully considered to ensure proper alignment and functionality after application.
2. Self-adhesive label printing using relief printing resin plates involves a precise film-making process. Computer typesetting is typically used, followed by laser phototypesetting. Negative images are commonly employed, with the final image appearing as a positive. The film’s transparent areas should have a density lower than 0.05, while the shaded areas must have a density above 3.0. The plate-making process includes exposure, washing, drying, and re-exposure to ensure accurate reproduction of the design.
3. Flexographic printing with resin plates is widely used for self-adhesive labels due to its flexibility, durability, and high resolution. To produce top-quality plates, both premium materials and advanced plate-making technology are necessary. Leading manufacturers like DuPont Cyrel from the U.S. and BASF from Germany offer high-performance options. These plates consist of a polyester protective layer, a photosensitive resin layer, and a polyester support film. The photosensitive resin is bonded to the support film to ensure dimensional stability, while the protective layer safeguards the plate during handling, cutting, and back exposure processes. This ensures consistent quality and longevity in the final printed product.
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