As for the type of base paper used, it is rarely decided solely by the carton factory. The selection of base paper depends on various factors, including the characteristics of the product being packaged (such as the quality of the contents and the expected usage duration), transportation conditions, the customer's business philosophy, and their approach to cost control. These elements collectively define the quality requirements of the base paper.
For low-end and low-margin products, it's common to use lower-grade base paper in order to reduce production costs and maintain a minimal profit margin. However, this can introduce challenges during the manufacturing process. For example, if the coating quality of the white board is poor, printing large areas of blue or green flat tones may result in mottling—where the fibrous structure beneath the coating becomes visible, causing uneven ink coverage.
To address this issue, one effective solution is to apply a dilution agent first during the printing process. By printing over the diluted surface, the agent can cover any exposed areas of the board, improving ink gloss while reducing the amount of ink needed. This method remains practical and efficient.
Another challenge arises when using white board with weak surface strength. During printing, this can lead to dusting, blistering, or delamination, which not only affects efficiency but also compromises print quality. To mitigate these issues, several steps can be taken: first, adjust the ink viscosity using a flushing agent; second, reduce the printing pressure to the minimum necessary to prevent damage to the paper; third, slow down the machine speed to minimize the force that ink exerts on the paper during transfer; fourth, arrange the color sequence logically—start with small layouts and low-viscosity inks before moving to larger areas and higher-viscosity ones; fifth, use air-pressing techniques, such as over-watering or pressing excess color sets before final printing; and sixth, consider using flexographic printing for boards with poor surface strength, as its ink viscosity is generally lower than that of offset or embossing methods. For products with smaller printed areas, this adjustment can significantly reduce the risk of dusting, blistering, or peeling.
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