How to solve the problem of color difference in printing production?
Time:2025-11-14
Views:28
Color adjustment process
The color adjustment process in printing is the core content of the entire color difference adjustment. In general, many printing technicians in enterprises only focus on experience or their own feelings when adjusting color, which is neither standardized nor uniform. They only stay in a very primitive color adjustment state, very casual.
On the one hand, it has no effect on improving color difference; On the other hand, it is difficult to adjust the hue; Thirdly, there is a lack of appropriate skills in shaping employees‘ color matching abilities.
Before color adjustment, special attention should be paid to preventing the use of printing ink systems from different manufacturers. It is best to use printing ink from the same manufacturer for color adjustment. It is necessary to comprehensively grasp the color deviation of various printing inks, which is helpful for controlling the ink during the color adjustment process.
If the remaining printing ink is used before color adjustment, it is necessary to first clarify the color of the printing ink, check whether the identification card of the printing ink is accurate, and preferably use a scraper to observe and compare the sample before adding. Before adding, the weight should be strengthened to record the data.
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In addition, when adjusting the intensity of ink, the measurement method can also be used for color adjustment. When scraping the ink sample, it must be symmetrical and supported by a white background, which is helpful for comparison with a unified standard sample. When the hue reaches 90% or more of the unified standard, strengthen viscosity adjustment. We can start making samples and then make minor adjustments.
It is worth mentioning that special attention must be paid to the accuracy of the data during the color matching process, and the precision of the electronic scale is important for the subsequent summary of process data parameters. After strengthening the ratio data of printing ink, it is possible to quickly and reasonably adjust the color through multiple practices, and also avoid the occurrence of color difference problems.
It is best to unify the color matching according to the size of the order quantity, and it is best to complete the color matching work at once to prevent color deviation caused by multiple color matching. Can reasonably reduce color difference and the occurrence of remaining printing ink.
When checking colors, sometimes even if they look the same under normal lighting, they may look different under another light source. Therefore, a unified standard light source should be chosen for color observation or comparison.
Printing scraper
If the ink scraper is frequently moved during production and processing, the working position of the scraper will be changed, which is not conducive to the normal transfer of printing ink and color reproduction. In addition, the pressure of the ink scraper cannot be changed arbitrarily.
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Before production and processing, it is necessary to adjust the angle and position according to the condition of the printed plate roller image and text. When cutting, special attention must be paid to the clean and neat movement of the hand. The angle of the scraper is usually between 50-60 degrees, and special attention should be paid to the symmetry of the three points on the plate, that is, the ink layer on the left, middle, right and right sides should be the same. In addition, special attention should be paid to checking whether the three points of the ink scraper are balanced before cutting, and there should be no wavy or one high and one low situations, which is important for the color stability of the printed product.
Adjustment of viscosity
Before production and processing, it is necessary to strengthen the adjustment of viscosity, preferably by adjusting it according to the expected machine speed. After adding the solvent, it should be thoroughly mixed before starting production and processing. When the product under inspection for accelerated production and processing meets the quality standards, viscosity testing can be carried out as a unified standard viscosity value for this product. This value should be recorded accurately in real time and adjusted according to the data for the entire product, which can reasonably reduce the color deviation problem caused by viscosity changes.
The detection of viscosity should pay special attention to its detection techniques. Usually, the main detection subject is the printing ink in the printing ink tank or printing ink basin. Before detection, the No. 3 viscosity cup must be cleaned thoroughly for accurate detection.
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In normal production processes, it is recommended to conduct a sampling inspection of viscosity every 20-30 minutes, and the captain or technician can adjust it based on changes in viscosity values.
When adjusting the viscosity of printing ink and adding solvents, special attention should be paid not to directly impact the printing ink to prevent damage to the system under normal printing conditions, separation of resin and pigment, and thus causing the printed product to bleed and poor color reproducibility.
production environment
Under normal circumstances, it is more appropriate to adjust the air humidity in the workshop between 55% and 65%. If the humidity is too high, it will affect the solubility of printing ink, especially the transfer in shallow areas is difficult to display normally. Reasonably adjusting air humidity can improve the adjustment of ink printing effect and color difference.
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raw material
Whether the surface tension of the raw materials 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. It is also one of the factors affecting color difference. Ensuring the product quality of raw materials is a prerequisite for quality control, and it is important to choose qualified and reputable suppliers!
Quality awareness
Quality awareness: refers to the perception of product quality by production, processing, and quality management personnel.
This perception must be evident, specifically reflected in the details of the work. So in terms of adjusting color difference, it is mainly to guide employees to improve their quality awareness, strive for excellence in their work, and shape their product quality concept.
For example, when making samples, it is necessary to strictly adhere to a minimum of 90% deviation from the standard sample before starting production and processing. Assist quality inspectors in strengthening the inspection work of the first piece during the first piece inspection. Strictly require team members to implement quality management systems in production and processing.
When changing the color of printing ink during production and processing, special attention should be paid to the cleanliness details of the printing ink basin, as well as whether the bottom plate and two end clamps of the ink scraper are replaced or cleaned in a timely manner. These small details, if not paid special attention to during production and processing, may cause color mixing between colors, resulting in color change and color deviation.
Color difference is inevitable in packaging printing, and the key to consider is how to reduce the occurrence of color difference.
By analyzing the specific factors mentioned above, improvement techniques can be found to further avoid and control color differences. Only by achieving standardization in source and sample management can color differences be reduced and avoided, and there should be no significant color difference between each batch of products; Only by paying special attention to detail operations and process data management in production and processing can we produce better products and improve the overall market competitiveness of the enterprise.
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