1. Human factors
Employees' lack of good professional ethics and strong sense of responsibility is one of the reasons for many major quality accidents. Therefore, in order to ensure the quality of the gravure printing of the composite film, first of all, we should strengthen the professional ethics education of employees and strengthen the position awareness of each employee; and require the employees to be proficient in the use and operation procedures of the equipment; Skills training.
Second, the machine factor
In the gravure printing of composite film , the equipment problem that caused the unclear picture and text is mainly that some related devices are not equipped or even equipped, but they are not well used. These devices mainly include the following.
1. Ink circulation device. Many companies' composite film printing equipment is not equipped with an ink circulation device. Instead, the ink is directly added to the ink tray. This will cause insufficient ink circulation and poor fluidity, resulting in unclear paste and printed graphics.
The ink circulation device includes two types of motor-type ink circulation device and pneumatic pump-type ink circulation device.
The price of the motor-type ink circulation device is relatively low, but often the foreign matter in the ink blocks the filter screen of the ink outlet slot, so that the ink does not enter the plate, causing deinking. Moreover, the amount of ink for the first time is relatively large, which is easy to cause the waste of ink.
Pneumatic pump-type ink circulation device has less initial ink distribution, which can reduce ink waste, and there are few foreign objects in ink blocking the filter screen and fire caused by overheating of the motor, which has high safety.
2. The ink scraper swings from side to side. As we all know, the left and right swing of the ink scraper can effectively eliminate the knife wire, the dirty print, and the unclear graphics caused by the blocking. However, in order to extend the service life of the scraper, some companies often remove the left and right swing device of the scraper. This will not only cause failures such as unclear graphics and text, but also shorten the service life of the plate cylinder.
3. Circulating water cooling device. The main function of the circulating water cooling device is to make the printed matter cool down quickly after leaving the oven, so as not to produce anti-sticking phenomenon and the mutual adhesion of the front and back sides of the printed product after winding. However, due to its high cost, many printing companies often do not have equipment when introducing equipment. The direct consequences of doing so are twofold.
First, as the equipment runs for a long time, the temperature of the first guide roller passing by the printed matter after leaving the oven will quickly rise. When the temperature rises to a certain level, the resin in the ink will be hot, causing reverse adhesion , The printed graphics are not clear.
The second is that the ink or varnish on the printed matter enters the winding device before it is completely dry. When it is unfolded, the front and back sides will stick to each other, which also causes unclear printed graphics.
Therefore, in order to reduce the unclear printed graphics of the composite film , it is recommended that you equip the above devices in time, otherwise you will lose the gain.
3. Material factors
The main materials that affect the printing quality are: printing materials, inks, solvents and rubber rollers.
1. Printing materials. The printing materials include plastic, paper, aluminized paper and aluminum foil. Our company mainly undertakes printing aluminum foil and aluminized paper. The surface treatment of aluminum foil is not good, too much oil stains will make the transfer performance of the ink worse, resulting in unclear printed graphics; and the effect of aluminum plating on aluminum paper is not good, the surface is uneven, the printed products will produce many bright spots, and the graphics will naturally Not clear.
2. Ink. Any of the ink's viscosity, fineness, yield value, thixotropy, fluidity, adhesion and other quality indicators that do not meet the printing requirements will affect the transfer of the ink on the printing material, resulting in unclear graphics. In addition, too much impurity content in the ink will also affect the clarity of the printed graphics. Therefore, when the old ink is used, it should be filtered, and a certain amount of new ink should be added. If necessary, the new ink can be replaced completely.
3. Solvent. The purity of the solvent is low, and it contains too much fat or water, which is inevitably not conducive to the full dissolution of the ink, resulting in the impure color of the printed product, and the printed graphics and text are not clear and full.
4. Plate cylinder. For gravure printing, the number of screen cylinder lines, the shape and depth of the mesh, the quality of the chrome layer, and the quality of the surface polishing treatment will directly affect the ink transfer rate in the mesh. If the ink transfer rate is low, the printed graphics will not be clear and full.
4. Method factors
The proficiency of the operation skills, the correctness of the operation methods, and whether they are operated strictly in accordance with the operation rules have a very important influence on the quality of the printed matter.
For example, the blade can be adjusted according to the season and raw materials. In summer, the temperature is higher and the solvent volatilization speed is faster. At this time, it is necessary to reduce the blade angle, shorten the distance between the ink scraping point and the imprinting point, and reduce the volatilization of the ink solvent on the plate surface to reduce the occurrence of blocking. In the case of slow solvent volatilization in winter, the opposite adjustment method can be used to promote the volatilization of the solvent and reduce the occurrence of paste. As another example, aluminum foil and aluminum-coated paper have different adsorption of ink, and different doctor blade adjustment methods should also be used.
In addition, the adjustment of the pressure of the doctor blade, the pressure of the embossed rubber roller, the tension of the printing material, and the volatility of the solvent should also be adjusted according to the season and the raw materials.
V. Environmental factors
The hygienic condition of the environment, temperature and humidity will affect the quality of the printed matter.
The environmental sanitation is poor, flying dust and other debris will fall into the ink, causing quality problems such as knife wire, blocking version, etc., resulting in unclear printed graphics.
If the ambient temperature is too high and the solvent volatilizes too quickly, the blocking phenomenon will also occur, resulting in unclear printed graphics.
If the ambient humidity is too high, excessive moisture will penetrate into the ink, which not only reduces the purity of the ink, but also causes the phenomenon of fogging on the surface of the ink, causing the printed graphics to be dull and unclear.
Therefore, the environment of the printing workshop should be clear and clean, and the temperature and humidity of the environment should be kept as constant as possible.
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