Flexo Technology: Four Corrugated Box Printing Techniques

[China Packaging Network News] In today's packaging industry, carton printing is booming, and customers are placing increasingly higher demands on product quality. As a result, improving the quality of carton printing has become a top priority for many companies. Here are some essential tips to achieve high-quality, precise printing on cardboard boxes. **Tips for Flexographic Printing on Low-Gram Surface Paper:** When using low-gram base paper for corrugated cardboard, surface printing can sometimes lead to visible corrugation marks, resulting in imperfections or areas where the printed image fails to appear clearly in the depressions. To address this issue, it's recommended to use flexible resin plates with good elasticity, which can help reduce printing defects caused by uneven surfaces. This is especially important when working with A-type corrugated boards made from low-gram paper, as excessive pressure during printing can damage the board’s flatness and side strength. Proper handling and pre-treatment of the board before printing can prevent warping and ensure consistent print quality. **Troubleshooting Color Variations in Batch Printings:** During mass production, even if individual sheets look perfect in four-color printing, inconsistencies across the entire batch can occur, affecting post-processing. Common causes include misalignment due to improper front gauge positioning or incorrect side alignment. The front gauge must be adjusted so that the paper moves smoothly without being too tight or too loose. Similarly, the side plate height and pulling force of the roller should be set correctly—typically 3 times the thickness of the paper, with a 5–8 mm gap between the side plate and the paper. These adjustments ensure accurate positioning and uniform print results. **Adjusting Printing Pressure for Optimal Results:** Proper printing pressure ensures even ink transfer, clear images, and no deformation of the printing plate. Once the correct pressure is set, it should not be changed frequently. The pressure between the anilox roller and the printing plate plays a key role in transferring ink evenly. If the pressure is too high, it may cause ink buildup and reduce print quality, while too little pressure can lead to insufficient ink coverage. Balancing these factors is crucial for smooth and efficient printing operations. **Flexographic Printing on Different Paper Surfaces:** The texture and absorbency of the paper significantly affect ink behavior. Rough, porous papers allow ink to dry quickly, while smooth, dense papers retain ink longer, leading to better detail reproduction. For example, coated whiteboard paper absorbs less ink than container board or tea board, resulting in slower drying but clearer prints. Its smooth surface also improves the resolution of small dots and enhances pattern accuracy compared to other types of paper. Understanding these differences helps in adjusting ink amounts and printing techniques accordingly for optimal results.

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