In the production process of custom paper packaging boxes, the process of registration is a core link that determines the quality of the finished product. However, unlike special paper boxes, the precision of registration directly affects the appearance, functionality, and brand value of the packaging box. Due to the complexity of factors such as paper characteristics, equipment precision, and process sequence, registration deviation issues are common. Many Jewelry Packaging Boxes also choose to register multiple processes to achieve a desired design effect, and then pair with pouch bags to highlight the theme. This article will systematically analyze from three aspects: common problems, technical difficulties, and optimization directions.
1.The core difficulty of process positioning is the accumulation of errors in multi-process superposition.
For example, in the three processes of printing → hot stamping → die-cutting, if there is a 0.2mm deviation in the printing positioning marks, after subsequent high-temperature hot stamping (paper shrinkage) and die-cutting pressure deformation, the error may be magnified to more than 0.5mm.
Key parameters: paper expansion rate (usually offset paper is ±0.3%, cardboard is ±0.5%), equipment repeat positioning accuracy (high-end die-cutting machines can reach ±0.1mm).
2. The uncontrollable deformation of custom paper packaging box materials:
The hygroscopic expansion coefficient of paper: For every 10% increase in relative humidity, the paper dimension changes by approximately 0.05%-0.1%;
The impact of hot pressing process: The high temperature of 150-200℃ during hot stamping/embossing leads to differences in local shrinkage rates.
3. Insufficient equipment coordination in custom paper packaging boxes:
The positioning systems of printing presses and post-press processing equipment (such as die-cutting machines, foil stamping machines) are not compatible;
there is a generational gap between traditional mechanical positioning and digital printing’s digital positioning.
