In the era of high-quality printing, it is essential to do printing tests on the printing machine. It is very critical for the pre-press personnel to make customized printing plates according to the capabilities of the machine. Today let us analyze the 7 major factors to be considered before printing:
1. Paper condition
Coated with whiteboard paper, general whiteboard paper, general corrugated cattle cardboard, the amount of ink transferred is different, the paper color is different after printing, the color is also different, you should make a color table according to each paper, find out the gray balance of dots as the printing Pre-production conditions.
2. Corrugated types
The choice of corrugation will directly affect the use of the weight of facial paper, requiring cardboard not to be exposed (washboard phenomenon):
A corrugated or C corrugated need to overcome the corrugated cardboard technology, generally increase the weight of facial paper if it cannot be overcome;
The matching of AE corrugated and CE corrugated and B corrugated and E corrugated can correspond to the printing effect without increasing the weight;
The complete shape of the corrugated cardboard and the uneven height of the corrugated paper directly affect the setting of the printing pressure. In order to make some thickness errors of the cardboard, increasing the printing pressure will make the overall dots expand differently, resulting in overall color difference. The largest cost paper will be As a result, the entire batch died.
3. Printing equipment accuracy
The error of the printing machine is to consider direct overprinting or hollow overprinting before printing. It is very important to preprint the four-color overprinted hollow characters. The design of the pattern needs to be clever or the spot color is used. Different considerations are made. If the printing quality is abnormal under the standard setting operation, you should immediately check whether the equipment is abnormal, and use a test version to make a correction press every six months.
4. Conditions of ceramic anilox roller
The production technology of ceramic anilox rollers with high mesh number has become more and more mature. Pursuing the conditions of using high mesh ceramic anilox rollers, the ink content is a need to be considered. The ink transfer capacity after the ink content is directly related to the ink demand of the paper. It is difficult to print the solid layout on the general whiteboard paper and corrugated cattle cardboard above the mesh of the ceramic anilox roll over 550LPI, but the ceramic anilox If the roll exceeds 550LPI, the printing effect on the coated whiteboard will be more detailed than the mesh below 350LPI. However, the ink content of the high mesh ceramic roller can be increased to make the color of the printed surface brighter, the brightness dot transfer ink is richer, and the transfer loss of fine dots is reduced. Therefore, the transfer of ink and ink to ceramic anilox rollers is very important, and relative maintenance can not be underestimated.
5. Ink and ink conditions
The requirements for ink are different for different papers, but the transparency of the four-primary inks in the stacking directly affects the final printing effect. The relative pre-press color separation and dot conditions will be closely related to ink. The coated whiteboard paper and general whiteboard paper or kraft paper have different requirements for the pH and surface tension of the ink. Coated whiteboard paper and general whiteboard paper or Kraft paper has its own needs, especially the conditions for coating whiteboard paper are very different from each paper mill. It is also a necessary process to test ink with offset printing on paper, so the ink will be based on different mesh numbers, paper conditions, and screen line numbers , Environmental factors, etc. It is very important to make different adaptations and make experimental plan record conditions.
6. Conditions of the printed version
The printing plate with 2.84? Thin version is very beneficial to the printing effect, flatness and excessive printing pressure are better than 3.94 ?, the printing plate must require a flat thickness. If you buy a printing machine, you must confirm the gap between the ceramic wheel and the printing plate. The pre-press processing file production must be compensated with the conditions shown on the test version. If this test is not done, it will produce distortion on the print. To achieve the realism of printing, the test version and the confirmation effect after compensation must be done to confirm Whether the compensation is correct after correction.
7. Printing machine operation
After the above conditions are integrated, the printing machine must operate with standard operation and set data standards to achieve "light" conditions, so that it can live up to the above-mentioned hard preparations before printing.
Conclusion
To meet the requirements of the era of high-quality printing, the overall performance needs must be considered from the design of the printing surface. Before the pre-press solution, relevant information must be collected, such as the conditions of the paper used, the type of corrugation, the accuracy of the printing equipment (overprint), The conditions of the ceramic anilox roller (mesh number and ink content), the setting of the ink condition, the operation of the printing machine (after standard dot expansion compensation calibration), find out the standard of dot expansion, and finally perform the pre-press operation. If it is unused paper, it is necessary to use standard dot gain compensation and calibration conditions to make pre-press job plate-making, otherwise the expected calculation cannot be achieved.
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