1. Dot: The dot is the smallest unit that makes up the printed pattern. Due to the different plate-making methods, the gravure dots reflect the dots on the plate roller differently: the size of the dots and the depth of the dots follow the changes in the electro-engraving engraving dots as the net composition changes; the coating corrosion dots change with the net composition , Only changes in the size of the dot; the change of the laser version of the dot into different dots is generally reflected in the depth of the dot.
2. Color: The color of an object comes from light. Most objects in nature are non-luminous, such as prints, flowers and trees. Their color comes from the reflection or transmission of the colored light of the solar spectrum. The three primary colors of light in nature are red, green, and blue. The different combinations of these three colors can form countless colors; the three primary colors of colorants are cyan, magenta, and yellow. In theory, this three-color pigment is mixed in different proportions. Get all the colors in nature.
3. Hard scraping and soft scraping: the effect of different installation methods of squeegee in gravure printing is different in printing. Hard scraping means that the scraper is shorter than the supporting blade, the effect is large, and the plate roller is easy to wear, which will have a little effect on solving the dirty surface. Soft scraping refers to the longer distance between the scraper and the supporting blade. The effect is that the color tone is gentle and easy to produce gray fog. It will be helpful for the transfer of the shallow part of the screen.
Transportation and storage of plate roller:
Protective measures should be taken in the transportation of plate rollers, such as wrapping a thick layer of corrugated paper on the surface of the plate rollers. Avoid collision and bumps during transportation.
After printing, the plate roller must be cleaned first. The ink residue in the plate roller will cause chrome and blockage. Then evenly coat the plate roller with a layer of anti-rust oil, wrap it with soft paper (you can also use the waste sample after printing), and place it in a cool and dry place.
Special attention should be paid to keeping the storage place away from acidic substances.
** Guide to maintenance of gravure plate roller **
The chromium layer on the surface of the gravure plate roller will be corroded quickly when it encounters corrosive liquids, gases, or unqualified solvents such as acids and alkalis, forming small dots on the plate surface, which will be transferred on the printing film during printing . This phenomenon is more likely to occur in a humid environment, because the moisture in the air is easy to absorb acid or alkaline gas, and the air is always in contact with the surface of the plate roller. When the chromium layer is just corroded, if the chromium is not removed and re-plated as soon as possible, it is likely to corrode the copper layer in a short time, so that the plate roller is scrapped, causing unnecessary losses.
In order to effectively avoid the above phenomenon, our company has provided a method for preserving the plate roller through various researches, for reference in use:
1. After one printing is completed, clean the plate roller with solvent;
2. Use a clean soft cloth to dry the layout without leaving fingerprints (because the fingerprint contains corrosive ingredients such as sweat);
3. Use a soft cloth dipped in clean, low-volatile light engine oil, and apply a uniform layer on the surface of the plate roller, taking care not to use waste engine oil;
4. Wrap the oiled plate roller with a film (or waste printing film) (with the ink side facing out) and store it in a ventilated, dry room upright or on a shelf.
The above method has been verified and can play a certain role in protecting the plate roller.
Problems and treatment methods in printing plate printing:
1. Drawing and threading: Non-pattern lines sometimes appear on the print during the printing process, and the lines are intermittent.
Cause: Mainly caused by ink contamination and coarse ink particles.
Solution:
1. Polishing the printing plate roller with 1000 # sandpaper will raise the drawing area.
2. Replace the scraper, or polish the scraper, and adjust the pressure and angle of the scraper.
3. Impurities in the ink will cause wire drawing, filter the ink or replace the ink.
4. Printing companies that frequently experience wire drawing should pay more attention to the environment of the printing workshop.
Second, bite the color: the printing process will appear the phenomenon that the latter color ink will bring down the former color ink.
Cause: This is often caused when the ink of the previous color has not yet dried and the ink of the second color has begun to transfer.
Solution:
1. Reduce printing speed.
2. Use quick-drying solvents.
3. Adjust the temperature and wind speed of the drying system.
4. Reduce the pressure of the impression cylinder.
3. Dirty version: High-speed gravure printing will cause the problem of dirty version, which is manifested by the non-printing surface of the cylinder also being stained with a hazy layer of ink, which makes the printed matter dirty.
Cause: Mainly due to a large amount of resin precipitation and coalescence, and the affinity of the resin to the roller, under the pressure of the blade, the resin will stick tightly to the roller, resulting in a dirty version.
Solution:
1. Use solvents with strong dissolving power and fast evaporation. (You can refer to the attached table of solvent parameters provided by us).
2. Reduce the viscosity of the ink, so that the resin is fully dissolved.
3. The squeegee adopts hard scraping in printing.
4. The angle of the scraper is about 60 degrees.
5. When none of the above solutions can be solved, try polishing the plate roller with 1000 # sandpaper.
4. Has the reticulation phenomenon or tortoise pattern bothered you?
If we look closely at the printed product, especially in the brown hue, or when the black version is heavy, we will find that there are many non-smooth but regular interference patterns on the printed sample, which affects the appearance and texture of the product. This is a topic for the plate-making company. After practice and research, we have developed a set of solutions to this problem. If your company has encountered such a problem, we are willing to relieve you of troubles.
5. White dots (fish scales) on the annoying transition network?
The transition net must be smooth, delicate and natural in printing, but often a disturbing phenomenon occurs at 80% of the dots, that is, there are fish scales accumulating on the dots. If you want to make a breakthrough in this aspect, please contact us.
How to print the best print?
Seven-point plate making and three-point printing. The quality of your product is good or bad, one of the big reasons is that the plate-making company does not have a special process suitable for you.
There are many factors that can make your printing machine make a good product. Printing machines, inks, substrates, printing plates and printing employees with technical skills will play an important role. We know that when different printing machines print the same set of rollers, the effect is very different. It may be that the effect of the light screen is different on the printed product, the hue saturation is not the same, and the level of the middle tone is different. .
Different inks will also have a big difference on the printing effect, which has a lot to do with the characteristics of the ink itself.
The inks of different manufacturers have different graying, color shift and color efficiency. In the end, it may appear that the gray balance is imbalanced on the printed product, there is a color shift, a certain color is light, etc. Different substrates will have a greater impact on printed products, and BOPP, PE, PVC, PET paper, and nylon will produce very different effects in printing.
If the negative effects caused by the above reasons are taken into account when making the plate roller, it will have a multiplier effect.
Plate-making companies often use the same plate-making process to make all customer plate rollers. Such plate rollers are popular. It does not consider the printing conditions of a customer. Such plate rollers may not be suitable for your equipment and process. The best performance of printing plant equipment and processes cannot be brought into play. Therefore, in order to make your product more outstanding, it is necessary to let the plate-making company understand your printing conditions and let them make special food that suits your appetite.
Through research and development, we have mastered how to make a method and process suitable for the customer's printing process according to the customer's printing conditions, and have produced a special platemaking process suitable for their printing process for some printing companies.
If you want to make your prints more outstanding, please go to Dongyun No. 2 Company to customize a plate-making process suitable for your company's printing conditions.
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