What issues should be considered when printing on cardboard packaging?

　　One issue to keep in mind when printing on cardboard packaging: the ink color should be eye-catching.

　　Since the cardboard packaging itself has a rather dark color, when selecting printing colors, it’s essential to prioritize inks with high color saturation and strong tinting strength—such as bright red—otherwise, the final printed color may significantly deviate from the desired shade.

　　Issue No. 2 to consider in printing with cardboard packaging: Avoid printing small text.

　　When it comes to cardboard packaging printing, the font size should be carefully chosen based on how effectively it conveys your product’s message. Text smaller than 2 cm in size typically becomes nearly invisible from a distance of more than 5 meters, thereby negating the purpose of promoting and selling your product.

　　Three key considerations for cardboard packaging in printing: Avoid full-page printing.

　　When cardboard packaging is printed with full-bleed or multi-sided graphics, in addition to the embossing roller exerting pressure on the box, the ink also penetrates the paper surface. These factors can weaken the box's compressive strength. Therefore, the simpler the printing design on the cardboard packaging, the better—and it’s best to avoid spreading graphics across the entire surface altogether, let alone using full-bleed color printing.

　　Four key considerations for printing on cardboard packaging: Avoid strip printing (aligned with the direction of the carton packaging machinery).

　　Some packaging designers, lacking knowledge of printing techniques, inadvertently incorporate horizontal gradient lines into their cardboard box print designs. During the printing process, the pressure applied causes these areas to collapse. As a result, stress concentrates in that particular region of the box, making it prone to breaking—specifically, area A becomes easily fractured.

　　Five key considerations for cardboard packaging in printing: Minimize printing pressure as much as possible.

　　To ensure high-quality carton printing while minimizing any impact on the packaging strength, printing pressure should be kept as low as possible, and fast-drying inks are recommended whenever feasible. Additionally, the printed area should maintain a minimum distance of 15 mm from the horizontal crease line, as the portion of the carton pressed down by the machine's creasing rollers may not receive sufficient ink coverage, potentially compromising the final print quality.

　　Six considerations for maintaining stable ink viscosity in cardboard packaging printing

　　Ink viscosity is a key parameter that needs to be controlled in carton packaging printing, as it is one of the main factors influencing print color quality. During the printing process, the evaporation of ink solvents causes the base viscosity to increase. To maintain stable ink viscosity, an ink stabilizer should be added every 30 minutes to 1 hour, at a dosage of 1% to 2%.

　　Seven considerations for paper box packaging in printing: Ensure stable paper feed.

　　In addition to ensuring the printing press runs at a stable speed, the manual paper-feeding process must also maintain a consistent drop point. For cardboard with uneven surfaces, proper handling is essential—such as folding it back along one or both sides of the cross-score line. Furthermore, all guide gaps for paper feeding should be uniform. These steps are critical for maintaining stable cardboard movement and directly address the issue of "plate shifting," a common problem in printing. It’s equally important to keep the printing equipment in optimal condition. In particular, regularly cleaning and maintaining both the anilox roller and the printing plate is crucial, as this directly impacts print quality. The anilox roller affects ink transfer efficiency, while the printing plate determines the sharpness and clarity of the printed text and images.

　　Eight key considerations for paper box packaging in printing: Maintain consistent ink transfer.

　　To achieve this, it is essential to maintain a balanced and steady printing speed. Since the printing speed directly affects the ink transfer process, the machine must operate smoothly without fluctuating—no sudden accelerations or decelerations allowed. Additionally, ensure consistent paper feeding to prevent skipped-sheet issues. Only by doing so can the water-based ink printing press maintain a stable ink-transfer condition, which plays a critical role in preserving the color consistency of water-based ink prints.

　　Nine things to keep in mind when printing on cardboard packaging: Minimize the number of overprints as much as possible.

　　The more times overprinting is done, the more severely the compressive strength of the carton packaging decreases.