One of the purposes of printing standardization is to establish modest layoffs and simplify complex work processes for all aspects of printing production. The second is to use standards as a means of conveying print-related information to facilitate communication. The third and most important purpose is to ensure that Product quality. Printing standardization involves a wide range of aspects, covering all aspects of the printing production process, including the standardization of the prepress data exchange format, the standardization of printing consumables, the standardization of the printing process, and the standardization of the printing environment. The standardization of printing consumables directly affects the quality and stability of printed products, which is the precondition and basis for enterprises to implement standardization.
There are many manufacturers' information for printing consumables. The most important and commonly used ones are printing plates, paper, inks, fountain solutions, blankets, and linings. It is worth mentioning that once the brands and models of printing plates, paper, inks and blankets have been determined, they cannot be replaced at will in the future production; while the lining and fountain solutions can only meet the performance requirements of printing, they can Replace as needed.
Printing plate
Different dots have different reproducibility. The reproducibility of outlets is mainly reflected in the degree of reduction of outlets, and the degree of restoration of outlets must be measured in terms of outlet distortion and outlet increase.
Dot increase curve reflects the level of printing tone. How much is it appropriate to increase the number of outlets? This is the first standard that companies must face first. The formulation of this standard directly determines the color performance detection systems and instruments for printed matter. Printing companies may refer to the international standard ISO 12647, or they may draw on Fogra, GATF, GRACoL, SWOP, DIN and Japan Color to formulate their own suitable conditions according to their own printing conditions. Printing standard. Once the standards for dot gain curve are established, they cannot be changed at will in the later production process, because the replacement standard is a very dangerous inkjet printer, which will lead to unstable color performance of printed products.
Therefore, at the time of printing and publishing, we must increase the curve according to the target outlets, and consciously make the outlets of the printing media smaller, so as to control the outlet tone curve of the printing press in accordance with the standards we set.
The standardized management process of the printing plate can be divided into three parts: 1. The parameter setting management of the plate making machine and the plate making machine. The parameter settings of the platesetter and processor are all based on the characteristics of the media used. Under normal circumstances, the supplier will provide the value of the parameter settings. What we need to do is understand and remember these parameter settings. 2 developer value management. The various parameters of the developer, such as conductivity, temperature, etc., need to be regularly measured and compared with the standard values. 3 network numerical detection management. Observe whether the publishing status is consistent by regularly measuring the area of ​​each tone dot.
2. Paper
The printability of different papers is different from that of Koji's fine print. The impact on printing is also different. The specific analysis can be made from the following aspects.
(1) Whiteness and color. Paper whiteness refers to the reflectance of blue or blue to the surface of a white or nearly white paper, expressed in terms of reflectivity relative to blue light irradiating the MgO standard plate surface; chromaticity refers to the paper's L*, a*, b* values. The stability and chromaticity of paper whiteness can directly affect the color rendering properties of the print.
(2) Smoothness and gloss. In printing, the prerequisite for obtaining faithful original prints is the smoothness of the paper. The smoothness of the paper directly affects the smoothness of the dot gain curve, thereby affecting the accuracy of the entire color tone reproduction. The gloss of paper refers to the ability of paper to reflect incident light, which directly affects the printing color gamut.
(3) ink absorption. Ink absorption weak printing, to a certain extent, can be a bright, high gloss prints, but it will also lead to prints drying speed is reduced, resulting in prints produce dirt and adhesion, in the multi-color printing "crystallized" Phenomena and so on.
There are many factors that affect the quality of printed matter on paper. Therefore, printability is appropriate. In the standardization of printing, paper must be standardized and managed. Standardized management of paper can be done by testing the printability of each paper to create an ICC Profile for each paper. Once the customer selects a paper as the substrate for the final product, the corresponding paper ICC Profile needs to be used in the front-end color separation.
3. Ink
Different inks due to color shift, gray scale, color efficiency, overprint rate and other performance, resulting in different color printing digital printing, in different printing production should pay special attention to the use of ink.
The conversion management of the ink requires the binding of paper because the ink is ultimately printed on the substrate. Therefore, it is necessary to test the printability of each ink and each paper combination, and to make an ICC Profile. It is generally recommended that a single printer use only one brand of ink, as the use of multiple brand inks can complicate the color management process.
4. Fountain solution
The ink balance is the basis of offset printing. The standardization of fountain solution in the dampening system is a very important item in the standardization of printing consumables. The main control points for fountain solution standardization are pH, temperature and conductivity.
(1) pH. The optimal dampening solution has a pH of 4.8-5.5. If the pH is higher than 5.5, the ink-receptive layer of the graphic part will be dissolved, resulting in a decrease in the print durability of the printing plate. The printing plate is apt to be dirty, and the printing plate is apt to be dirty. The over-emulsification of the ink due to the large increase of the hydrophilic groups may also cause the ink-ink imbalance. In addition, the contrast between the field and the outlets will be reduced and the gloss will be reduced. If the pH is less than 4.8, the drying agent in the ink will be affected, which will slow down the drying speed.
(2) Temperature. The best temperature control should be 10 ~ 12 °C. Alcohol has good volatility, which allows the temperature of the fountain solution to be controlled, but if the temperature is too low, moisture in the air will condense on the printing press. Therefore, the tank cooling system can be used to reduce alcohol evaporation to maintain the flow and average speed of the fountain solution.
(3) Conductivity. The fountain solution circulation system must be cleaned digitally on a regular basis, and the conductivity should be maintained at 700 to 1700 μS/cm (different brand values). Since different brands of fountain solution have different characteristics, the best conductivity is determined according to its own characteristics. The conductivity indicates how much fountain solution is added. Its value is proportional to the size of the component added to the fountain solution. When the pH value reaches a certain level, the conductivity will remain unchanged. The change in liquid concentration is published, so the conductivity is an accurate measure of the concentration of the fountain solution.
The effect of the fountain solution on the offset printing is self-evident. Therefore, the monitoring of the fountain solution needs to be carried out every day. Once it is found that the non-compliance of the standard should be solved immediately, so as not to affect the printing quality.
Talking about the relationship between printing consumables and printing standardization
May 23 10:06:44, 2024
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