Quality control in printing involves six key points, proceeding with caution every step of the way

1.Plate blockage: Dot blockage can cause a decrease in ink transfer, resulting in a change in printed colors. When blockage occurs, solvent or cleaning agents should be used to clean the plate, and corresponding measures should be taken to address the cause of the blockage.

2.Plate wear: Plate wear can cause dots to become smaller and shallower, affecting ink transfer. The result of plate wear is an overall lightening of colors. Sometimes, wear on the plate leads to insufficient ink coverage, especially affecting the opacity of the substrate. Bible printing. In such cases, production should be halted to change plates, and old plates should be re-plated. If plate cylinders have collapsed due to excessive meshing, preventing re-plating, new plates must be made.

3.Inconsistent pattern colors: When multiple patterns are arranged horizontally on a layout, it’s possible for the colors of the patterns at the left and right ends of the plate to be inconsistent. paper bag printing. During plate making, especially for full-page solids, variations in dot size can occur from left to right, so it’s important to check for differences in print quality at the left and right ends of the plate.

4.Rationality of plate design: When designing plates, the impact of plate design on the printing process and post-print processing should be fully considered. printing in China. For example, color jumps in dot areas of around 80% and 5% are prone to create uneven layers, so corrective measures should be taken in advance.

5.Printing environment factors: Significant fluctuations in ambient temperature in the printing workshop can alter the flow state of ink. Generally, the temperature in the production workshop should be controlled within (23±5) degrees Celsius, with humidity at 60%±5%. Additionally, ink should be preheated in winter to enhance its flow properties. catalog printing.

6.Printing conditions: Irregular airflow over the layout can lead to changes in printing speed and drying speed, resulting in changes in printed colors. book printing. All these factors should be thoroughly considered during the printing process.