When selecting a liner for flexographic printing, it's essential to take two fundamental factors into consideration first:
â‘ Printing materials. Flexographic printing can be applied to a wide range of substrates, including soft plastic films, rigid glass products, metal foils, and corrugated cardboard. Therefore, the choice of liner should first focus on the compatibility and versatility of the materials being printed. A suitable liner must adapt well to the surface texture and physical properties of the material to ensure optimal print quality.
â‘¡ Characteristics of the printing pattern. The type of pattern being printed plays a significant role in determining the appropriate liner. For solid areas, a harder liner is typically preferred as it provides better support and maintains sharpness. On the other hand, screen patterns or fine halftones require a softer liner to allow for proper ink transfer and avoid smudging. If the design includes both solid lines and small details or dots, a neutral or medium-hard pad is often the best choice, as it offers a balanced performance across different elements of the image.
It’s important to use only one type of double-sided tape for a single product during the printing process, regardless of whether the design includes halftone screens, text, or background areas. This is because different types of adhesives have varying densities and elastic properties. Even if they are the same thickness, when pasted onto the plate cylinder with the same diameter, their compression behavior under pressure will differ. As a result, the impression length on the printed material may vary, leading to misregistration between colors. To avoid this issue, it’s crucial to carefully select the right padding based on the specific printing conditions and process requirements. In real-world production, choosing the correct liner can significantly impact the final print quality and consistency.
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