How can we control the color difference in printing products

Six tips for color difference control

Color difference refers to the difference in color. In daily life, the color difference we often say refers to the phenomenon of color inconsistency when the human eye observes the product. For example, in the printing industry, the difference in color between printed matter and standard samples provided by customers.
To control color difference, there are six aspects that need to be paid attention to: printing and coloring, printing squeegee, viscosity control, production environment, raw materials and quality awareness.

• Coloring link

Printing and color adjustment is the core content of the entire color difference adjustment. Normally, printing technicians in many companies only pay attention to experience or their own feelings when color adjustment. It is neither standard nor uniform. Just stay in a very primitive state of color correction, very casual. On the one hand, it has no effect on the improvement of chromatic aberration, and on the other hand, it is difficult to adjust the hue. Thirdly, there is no proper skill for shaping employees' color matching ability.

Before toning, special attention should be paid to avoid using printing ink systems of different manufacturers for color mixing. It is best to use printing inks of the same manufacturer for color mixing. The colorist must fully grasp the hue shift of various printing inks, which will help To control during the color mixing process. If the remaining printing ink is used before toning, you must first figure out the hue of the printing ink, check whether the identification card of the printing ink is accurate, it is best to use a squeegee to observe and compare the sample, and then Before adding, the weighing of the weight should be strengthened, and then the data should be recorded.

In addition, when adjusting the intensity of the spot color ink, you can also use the metering method for color mixing. The color sample must be evenly balanced when scraping the ink sample, and the white background should be supported, which is helpful for comparison with the unified standard sample. When the hue reaches more than 90% of the unified standard sample, strengthen the viscosity adjustment. We are able to proof, and then fine-tune it. It is worth mentioning that, in the process of color matching, special attention must be paid to the accuracy of the data. The accuracy of the electronic scale is very important for the subsequent process data parameter summary. When the printing ink ratio data is strengthened, after several times of practice, the color can be adjusted quickly and reasonably, and the color difference problem can also be avoided.

It is best to uniformly match the ink according to the size of the order, and it is best to complete the color matching work at one time to prevent the hue deviation caused by multiple color matching. It can reasonably reduce the chromatic aberration and the occurrence of the remaining printing ink. When checking the color, sometimes the color looks the same even under normal light, but it looks different under another light source. Therefore, you should choose to use a uniform standard light source for color viewing or color comparison.Printing and color adjustment is the core content of the entire color difference adjustment. Normally, printing technicians in many companies only pay attention to experience or their own feelings when color adjustment. It is neither standard nor uniform. Just stay in a very primitive state of color correction, very casual. On the one hand, it has no effect on the improvement of chromatic aberration, and on the other hand, it is difficult to adjust the hue. Thirdly, there is no proper skill for shaping employees' color matching ability.

Before toning, special attention should be paid to avoid using printing ink systems of different manufacturers for color mixing. It is best to use printing inks of the same manufacturer for color mixing. The colorist must fully grasp the hue shift of various printing inks, which will help To control during the color mixing process. If the remaining printing ink is used before toning, you must first figure out the hue of the printing ink, check whether the identification card of the printing ink is accurate, it is best to use a squeegee to observe and compare the sample, and then Before adding, the weighing of the weight should be strengthened, and then the data should be recorded.

In addition, when adjusting the intensity of the spot color ink, you can also use the metering method for color mixing. The color sample must be evenly balanced when scraping the ink sample, and the white background should be supported, which is helpful for comparison with the unified standard sample. When the hue reaches more than 90% of the unified standard sample, strengthen the viscosity adjustment. We are able to proof, and then fine-tune it. It is worth mentioning that, in the process of color matching, special attention must be paid to the accuracy of the data. The accuracy of the electronic scale is very important for the subsequent process data parameter summary. When the printing ink ratio data is strengthened, after several times of practice, the color can be adjusted quickly and reasonably, and the color difference problem can also be avoided.

It is best to uniformly match the ink according to the size of the order, and it is best to complete the color matching work at one time to prevent the hue deviation caused by multiple color matching. It can reasonably reduce the chromatic aberration and the occurrence of the remaining printing ink. When checking the color, sometimes the color looks the same even under normal light, but it looks different under another light source. Therefore, you should choose to use a uniform standard light source for color viewing or color comparison.

 

• Printing squeegee

The effect of the printing squeegee on the color difference. If the squeegee is frequently moved in the production process, the working position of the squeegee will be changed, which is not conducive to the normal transfer of printing ink and color reproduction. In addition, the pressure of the squeegee is also It cannot be changed at will.

Before production and processing, it is necessary to adjust the angle and position according to the graphic status of the printing plate roller, and pay special attention to the cleanness of the hand when the knife is cut. The angle of the squeegee is usually between 50-60 degrees. The squeegee should pay special attention to the uniformity of the three points on the layout, that is, the ink layer on the left, middle and right should be the same. In addition, you must pay special attention to check whether the three points of the squeegee blade are installed in balance before cutting the knife, and there will be no wave shape and one high and one low. This is very important for the stability of the hue of the printed product.

 

• Viscosity adjustment

It is necessary to strengthen the adjustment of viscosity before production and processing. It is best to adjust the machine speed according to the expected speed. After adding the solvent, wait for 10 minutes and then start the production and processing. When the product under the accelerated production and processing inspection meets the quality awareness standard, the viscosity can be tested at this time as the unified standard viscosity value of the product. This value should be recorded and accurately recorded in real time and the entire product can be adjusted according to the data, which can be reasonable Reduce the hue deviation caused by the change of viscosity. Special attention should be paid to the detection techniques for viscosity detection. Normally, the main detection body is the printing ink in the printing ink tank or the printing ink basin. The No. 3 viscosity cup must be cleaned before the detection to facilitate accurate detection.

In the production process under normal circumstances, we recommend that the viscosity be sampled every 20-30 minutes, and the captain or technician can adjust the viscosity according to the change of the viscosity value. When adjusting the viscosity of the printing ink and adding solvents, pay special attention not to directly impact the printing ink to prevent damage to the printing ink system under normal conditions and separation of resin and pigments, which will cause the printed product to bloom and reproduce colors. Not enough sex.

• Production Environment

The air humidity in the workshop should be adjusted between 55% and 65% under normal circumstances.

Too high humidity will affect the solubility of the printing ink, especially the transfer of the shallow mesh area is difficult to display normally. Reasonable adjustment of air humidity has an improved effect on the adjustment of ink printing effect and chromatic aberration.
 

• Raw material

Whether the surface tension of the raw material is qualified or not affects the wetting and transfer effect of the printing ink on the substrate, as well as the color display effect of the printing ink on the film, and it is also one of the factors affecting the color difference. Ensuring the product quality of raw materials is a prerequisite for quality control, and it is important to choose qualified suppliers!
 

• Quality awareness

Refers to the perception of product quality by production, processing and quality management personnel. This perception must be obvious and reflected in the details of the work. In terms of color difference adjustment, it is mainly to instruct employees to improve their quality awareness, strive for excellence at work, and shape product quality concepts. For example, when proofing, strictly abide by more than 90% of the standard sample before starting production and processing. Assist the quality inspectors to strengthen the inspection work of the first article. In the production and processing, the team personnel are strictly required to implement the quality management system. In the production and processing, such as changing the hue of the printing ink, pay special attention to the cleaning details of the printing ink basin, and pay special attention to whether the bottom plate and the two ends of the squeegee are clamped. There is time to replace or clean, these small details, if you do not pay special attention to the production and processing, color mixing between hues will occur, resulting in color discoloration, and then chromatic aberration.

Color aberration printing is inevitable. How to avoid or reduce the occurrence of color aberration is the key to consideration. Using the specific analysis of the above factors, we can find improved techniques to further avoid color aberration and control the color difference. , Only by standardizing the source and sample management, can the color difference be reduced and avoided, and the product between each batch can be made without obvious color difference. Only in the production and processing, special attention is paid to the details of the operation and the process data. Management can make better products, and then improve the company's comprehensive market competitiveness.