What is chromatic aberration?
Chromatic aberration refers to the difference in color. In daily life, we often say that color difference 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 the printed matter and the standard sample provided by the customer.
In industry and commerce, it is very important to evaluate product color difference accurately. However, many factors, such as light source, viewing Angle and observer’s own condition, may lead to the difference in color evaluation.
01 Color mixing
Printing toning link is the core content of the whole color difference adjustment. In general, many printing technicians of enterprises only pay attention to experience or their own feelings when toning, which is neither standard nor unified standard. They only stay in the very original color toning state and are very casual. On the one hand, it has no effect on the improvement of chromatic aberration, on the other hand, it is difficult to adjust the hue. Third, there is no appropriate skill in shaping the color matching ability of employees.
Before toning, special attention should be paid to preventing the use of printing ink systems from different manufacturers from toning. It is best to use printing ink from the same manufacturer for toning. It is necessary for toning workers to comprehensively grasp the color bias of various printing ink, which is conducive to control in the process of toning. Before toning, if the remaining printing ink is used, it is necessary to first make clear the hue of the printing ink, check whether the identification card of the printing ink is accurate, it is best to use the ink scraper for scraping sample observation and comparison, and then add, before adding, the weight should be strengthened to weigh, and then record the data.
In addition, when adjusting the shade of special color ink, you can also use the method of measurement for toning. When scraping the ink sample, it must be symmetrical, and it must hold the white background, which helps to compare with the unified standard sample. When the hue reaches more than 90% of the unified standard sample, strengthen the viscosity adjustment. We can make samples, and then fine-tune it. It is worth mentioning that in the process of toning, special attention must be paid to the accuracy of the data, and the accuracy of the electronic scale is very important for the summary of the process data parameters. When the ratio of printing ink data is strengthened, through several times of practice can be quickly and reasonably toned, but also can avoid the occurrence of color difference.
It is best to unify the ink matching according to the size of the order quantity, and it is best to complete the color matching work at one time to prevent the chromatic deviation caused by several color matching. Can reasonably reduce the color difference and the occurrence of the remaining printing ink. When checking color, sometimes even if color looks same below general illumination, but look different however below another kind of illuminant, because this should choose the illuminant that uses unified standard undertakes observing color or compare color.
02 Printing scraper
The influence of printing scraper on color difference if the scraper is often moved in the production and processing, the working position of the scraper will be changed, which is not conducive to the normal transfer and color reproduction of printing ink, and the pressure of the scraper can not be arbitrarily changed.
Before production and processing, it is necessary to adjust the Angle and position according to the picture and text of the printing roll. The next knife must pay special attention to the clean and sharp action of the hand. The Angle of the scraper is usually between 50-60 degrees. In addition, before cutting, special attention should be paid to check whether the scraper three points are balanced, and there will be no wave type and a high and a low situation, which is very important for the stability of printing phase.
03 Viscosity adjustment
Viscosity adjustment should be strengthened before production and processing, and it is better to adjust it according to the expected machine speed. After solvent is added, the machine will fully sequencing after 10 minutes before starting production and processing. To be accelerated production processing inspection machine products to meet the standard of quality awareness, at this time can carry out viscosity detection, as the unified standard viscosity value of this product, this value should be recorded immediately and the whole single product according to the data to adjust, can reasonably reduce the color deviation caused by the change of viscosity. The detection of viscosity should pay special attention to the detection skills. Usually, the printing ink in the printing ink bucket or the printing ink basin is the main detection body. Before detection, no. 3 viscosity cup must be cleaned to facilitate accurate detection.
In normal production, it is recommended that the viscosity be sampled every 20-30 minutes. The captain or technician can adjust the viscosity according to the change of the viscosity value. When adjusting the viscosity of printing ink and adding solvent, special attention should be paid to not directly impact the printing ink, in order to prevent the damage of the printing ink system under normal conditions, the separation of resin and pigment, and then the printing product hair, color reproducibility is not enough.
04 Production Environment
Workshop air humidity regulation, under normal circumstances we adjust 55%-65% is more appropriate.
High humidity will affect the solubility of printing ink, especially the transfer of shallow net area is difficult to show normally. Reasonable adjustment of air humidity, ink printing effect and color adjustment has an improved role.
05 the raw material
Whether the surface tension of the raw material is qualified affects the wetting and transfer effect of the printing ink on the substrate, and also affects the color display effect of the printing ink on the film, and is also one of the factors affecting the color difference. To ensure the quality of raw materials is a prerequisite for quality control. It is very important to choose qualified suppliers.
06 Quality Awareness
Quality awareness refers to the perception of product quality by production, processing and quality management personnel.
This perception must be obvious, reflected in the details of the work. So in the adjustment of color difference is mainly to guide the quality awareness of the staff to improve, in the work of excellence, shape the concept of product quality, such as in proofing strictly comply with the standard sample reached more than 90%, can start production and processing, in the first piece to assist quality inspection personnel to strengthen the first piece of inspection work.
Strict with crew in production and processing performance of the quality management system, such as replacement of printing ink hue in the production and processing, especially pay attention to the printing ink basin details, and pay special attention to the ends of the floor and that scraping blade clip is there change in time or cleaning, these small details, if not pay special attention to in production and processing can occur between mixed color hue, Cause color discoloration, and then chromatic aberration.
Color difference in the printing is inevitable, how to avoid or reduce the happening of the color difference, is the key, a detailed analysis of various factors of the above, to be able to find the improved technique, can further to avoid color difference, method to control the color difference, only on the source and sample management standardization, can reduce and avoid the color difference, Only by paying special attention to the management of detailed operation and process data in the production and processing can we make better products and improve the comprehensive market competitiveness of enterprises.
Post time: Feb-18-2022
