In the process of printing HONOR mobile phone packaging box, to ensure the alignment accuracy of patterns on different surfaces, it is necessary to control from multiple aspects:
Prepress preparation stage
Design file processing: In the design stage, it is necessary to accurately plan the position of each pattern on the packaging box expansion diagram. Use professional graphic design software, such as AdobeIllustrator, to accurately place the pattern elements in the corresponding positions, and set the bleed line and cutting mark. After the design is completed, the file is carefully checked and proofread to ensure that the position relationship of the patterns on different surfaces is accurate at the digital file level.
Plate making: When making printing plates according to design files, the plate making process is crucial. For high-precision packaging box printing, CTP (computer to plate) technology is usually used. CTP plate making can accurately convert the pattern and text information in the design file into dots on the printing plate. During the plate making process, the parameters of the plate making equipment, such as laser power, exposure time, etc., must be strictly controlled to ensure the accurate position of the dots of the patterns on different surfaces on the printing plate. At the same time, the quality of the prepared plates must be inspected to check whether there are problems such as plate deformation and dot loss.
Control during the printing process
Adjustment of printing equipment: First, ensure the mechanical accuracy of the printing press. Regularly calibrate and maintain the key components of the printing press, such as the rollers and guide rails, to ensure the smooth operation of the printing press. When installing the printing plate, use a high-precision positioning device to accurately fix the printing plate on the printing press roller, and control the error within a very small range. Secondly, adjust the registration system of the printing press to monitor and adjust the position deviation of different color plates and different surfaces during printing through electronic or optical sensors.
Optimization of printing process parameters: Parameters such as printing speed, printing pressure and ink viscosity will affect the alignment accuracy of the pattern. When printing the HONOR mobile phone packaging box, choose the appropriate printing speed according to the paper type and the complexity of the printed pattern to avoid excessive speed causing the paper to shift during the printing process. The printing pressure should be uniform to prevent uneven pressure from causing deformation of the printing plate, thereby causing pattern dislocation. The viscosity of the ink should remain stable. Too thin ink may cause dot enlargement and affect the pattern accuracy. Too thick ink may cause insufficient ink transfer.
Quality inspection and correction
Online inspection system: Equipped with online inspection equipment on the printing production line, using high-precision cameras and image recognition software, the printing quality and alignment accuracy of the patterns on different sides of the packaging box are monitored in real time. Once the pattern alignment deviation is found to exceed the allowable range, an alarm is immediately issued, and the operator can stop the machine in time for adjustment.
Sampling inspection and manual correction: In addition to online inspection, it is also necessary to conduct sampling inspections on printed products. Visually inspect the sampled packaging boxes under standard light sources to check the alignment of the patterns on different sides. For packaging boxes with slight alignment deviations, they can be corrected by manually adjusting the registration device of the printing press. Products with large deviations must be marked and isolated to prevent them from flowing into the next process.
