1. The pre-press design requirements for self-adhesive labels are essential to ensure high-quality printing results. First, it's important to fully understand the technological process involved in label production. Second, when it comes to color application, spot colors should be used to complement four-color printing, especially when achieving specific hues that may not be possible with CMYK alone. This helps in maintaining clarity and simplicity in the final design. Third, for vibrant colors and large areas, separate plates should be made to ensure better color consistency and sharpness. Fourth, avoid using very thin lines or overly small text, as these can become blurred or unreadable during the printing process. Fifth, when dealing with image tones, focus on enhancing the mid-tones while keeping the highlights and shadows flat to maintain a balanced look. Lastly, when arranging the layout for printing, pay attention to the direction of the marking and the positioning of the label on the sheet to ensure proper alignment during the printing and cutting stages.
2. When producing self-adhesive labels using relief printing with resin plates, the film is typically created through computer typesetting and printed using a laser phototypesetter. Most commonly, negative films are used, which appear as positives when viewed. The light-transmitting areas of the film should have a density below 0.05, while the shaded areas must have a density above 3.0. The plate-making process involves 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 a high-quality flexo plate, it’s crucial to use both premium materials and advanced plate-making technology. Currently, the best options available include the DuPont Cyrel plates from the U.S. and BASF plates from Germany. 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 provide dimensional stability, while the protective layer ensures the plate remains intact during handling, cutting, and back-exposure processes. This construction helps prevent damage and maintains print quality throughout the production cycle.
Overall, careful planning and attention to detail in both the design and plate-making stages are key to achieving professional and visually appealing self-adhesive labels.
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