How does liquid photopolymer improve adhesion and print quality in corrugated cardboard printing due to its low hardness?
Publish Time: 2026-06-25
In the corrugated cardboard packaging printing industry, print quality directly impacts product appearance and brand image. Due to the significant corrugated structure and thickness variations on the surface of corrugated cardboard, traditional high-hardness printing plates are prone to uneven contact, missing images, and uneven color during printing. Liquid photopolymer, a photosensitive resin material specifically designed for corrugated cardboard printing, exhibits unique advantages in the production of thick, flexible printing plates due to its low hardness (around Shore A25) and excellent elasticity.
1. Low Hardness Enhances Plate Flexibility
Photosensitive resin printing plates made from liquid photopolymer possess low hardness and good flexibility. When the plate contacts the corrugated cardboard, the plate surface can deform appropriately according to the slight undulations of the cardboard surface, allowing for more complete contact between the printed image area and the substrate. Compared to higher-hardness printing plates, this flexibility effectively reduces contact gaps, improves the integrity of ink transfer, and creates favorable conditions for obtaining clear and uniform printing results.
Corrugated cardboard inherently has some surface unevenness, especially during high-flute or thick cardboard printing, where local height differences can affect the contact quality of the printing plate. Liquid photopolymer low-hardness printing plates better adapt to the cardboard surface contours, achieving uniform lamination under printing pressure. Whether it's text, lines, or large-area patterns, a more stable contact state is achieved, reducing missed prints and broken lines, and improving overall print integrity.
3. Improve Ink Transfer Uniformity
Print quality depends not only on image clarity but also on ink transfer. Due to the good elasticity and compressibility of liquid photopolymer, the printing plate maintains a relatively uniform pressure distribution during contact, allowing the ink to transfer more stably to the cardboard surface. This not only avoids problems of excessively dark or light colors in certain areas but also improves the uniformity of solid printing areas, resulting in a fuller and more aesthetically pleasing printed image.
4. Enhance Image and Text Detail Reproduction Ability
In brand packaging and high-quality carton printing, small text, trademarks, and complex graphics require high printing precision. Liquid photopolymer printing plates, with their excellent adhesion properties, ensure complete contact between the image and text areas and the printing surface, minimizing detail loss. Even with corrugated cardboard with a high surface roughness, they effectively reproduce the design content, improving text edge clarity and image depth, thus enhancing the visual appeal of the packaging.
5. Reduced Impact of Printing Pressure on Cardboard
Traditional high-hardness printing plates often require increased printing pressure to ensure contact, which can easily cause cardboard deformation and potentially affect print quality. Liquid photopolymer low-hardness printing plates achieve good adhesion under lower pressure, reducing pressure on the cardboard structure. This helps maintain the original strength of the carton, reduces equipment wear, and improves production process stability.
6. Enhanced Plate Resilience and Durability
Low hardness does not mean reduced durability. Liquid photopolymer is professionally formulated to combine flexibility with excellent resilience. During long-term continuous printing, the printing plate can quickly return to its original shape, reducing the risk of permanent deformation. Stable resilience not only helps maintain printing accuracy but also extends the plate's lifespan, reducing production costs for businesses.
7. Meeting the Quality Demands of Modern Packaging Printing
As market demands for packaging appearance continue to rise, corrugated board printing is evolving towards higher definition and higher quality. Liquid photopolymer, with its low hardness, high adhesion, and excellent printability, can meet the comprehensive requirements of the modern packaging industry for graphic representation, color reproduction, and production efficiency. It has broad application prospects in food packaging, logistics cartons, e-commerce packaging, and brand display packaging.
Liquid photopolymer, through its low hardness, endows printing plates with excellent flexibility and adhesion, enabling them to better adapt to the complex surface structure of corrugated board. By improving contact uniformity, optimizing ink transfer effects, enhancing graphic reproduction capabilities, and reducing printing pressure, this material significantly improves the printing quality and production efficiency of corrugated board.
