When selecting a liner for flexographic printing, it's essential to start by considering two fundamental factors:
â‘ The type of printing material. Flexographic printing can be applied to a wide range of substrates, including soft plastic films, rigid glass containers, metal foils, and corrugated cardboard. Therefore, the choice of liner should first take into account the versatility and compatibility with the materials being printed. A suitable liner ensures proper adhesion and print quality across different surfaces.
â‘¡ The characteristics of the printing pattern. Different patterns require different types of liners. For solid areas, a hard liner is typically preferred as it provides better support and maintains sharpness. On the other hand, screen or halftone patterns benefit from a softer liner, which helps in achieving even ink distribution and better detail reproduction. If a design includes both solid lines and fine details or small dots, a neutral or medium-density liner is often the best choice, as it offers a balance between flexibility and support.
It's important to use only one type of double-sided adhesive within the same printing job, regardless of the complexity of the plate design—whether it includes screen lines, text, or background elements. This is because different adhesives have varying densities and elastic properties. Even if they are the same thickness, when applied to the plate cylinder with the same diameter, their compression behavior during printing will differ. As a result, the printed image length may vary slightly, leading to misregistration between color plates. To ensure accurate color alignment and consistent print quality, it’s crucial to choose the right padding based on the specific printing conditions and process requirements.
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