Gravure printing process troubleshooting

During gravure printing, we often encounter some process failures. These processes not only occur in the printing process, but also occur in prepress and post-processing areas. The occurrence of these failures often results in the loss of processing costs, repair fees, and raw material costs; the order of printing operations is chaotic; efficient production is hindered and costs increase; valuable printed products cannot be provided, leading to a decline in market competitiveness.

In gravure printing, the problem of process failures is mainly manifested in the following aspects.

Prepress area: Incomplete product planning; poor print composition; incomplete design; bad platemaking;

Printing field: poor printing effect; inconsistent hue: inaccurate dimensions; poor print adaptability; poor printing conditions; inaccurate printing accuracy; incomplete press equipment; poor press operation; poor printing shop environment, etc.

Post-press processing: defective laminates; poor suitability for bag making; poor packing adaptability; poor post-processing performance (boiling, steam sterilization), poor light resistance, poor storage and adaptability, and poor flowability : Convenient for poor performance and so on.

Here are some examples of common failures in gravure printing.

The “pollution” , also called “non-graphic” phenomenon, refers to the phenomenon that the ink that has missed the doctor blade is transferred to the printing paper, and is a unique failure in gravure printing.

The unfavorable factors that produce stains are:

1, printing speed;

2, printing ink viscosity hard;

3, less diluent;

4. Extensive use of solvents other than No. 2 (standard) and No. 3 (slow drying) desiccants;

5, the ink drying is slow;

6, the blade is in a wavy state, the blade is too much, the blade pressure is too large, and the angle of the blade is not accurate;

7, the plate around the roller is too thin.

There is version pollution, we should analyze and adopt the corresponding solution.

1, reduce the printing speed, reduce the viscosity of the ink, in order to reduce the shear stress:

2, increase the amount of thinner resin, in order to improve the lubrication;

3, suspend the use of special speed drying, slow drying solvents, and try to improve the re-solubility;

4, to improve the drying performance.

Among the above solutions, the first one is the most effective strategy. In addition, we should also pay attention to the following matters:

1. The circumference of the roller must be small;

2. The accuracy of the given blade, grinding angle, etc.;

3, too much force applied to the blade.

In short, one kind of factor can't cause the breakdown to happen, should consider the comprehensive factor in many aspects, summarize the comprehensive countermeasure.

Electrostatic failure is the most difficult phenomenon to explain clearly in most printing problems. In particular, the emergence of a variety of printing papers and the pursuit of higher printing speed have made this phenomenon more likely to occur. Static electricity mainly includes frictional electrification, flow electrification, discharge electrification, stripping electrification, smashing electrification, and stirring electrification and mixed electrification. Among them, friction and electrification, flow electrification and stripping electrification are the most important in relation to printing. Compared with other types of work, printing can be said to be very easy to generate static electricity. In the future, research on countermeasures against static electricity will become an important management project.

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