Handle these six samples to help you solve the problem of color difference in composite film printing
[Points to watch] When printing composite films , to control the color difference, there are six aspects that need to be paid attention to: printing toning link, printing squeegee, viscosity control, production environment, raw materials and quality awareness. This article was written by an expert in the industry, Tang Yongqiang, and details how to accurately control chromatic aberration from these six aspects.
Method for controlling chromatic aberration
One: color adjustment
The printing and grading process is the core of the entire chromatic aberration control. Usually, the printing operators of many enterprises only focus on experience or their own feelings when grading. They are neither standard nor standard, but just stay in the very The original toning state is very random. Firstly, it does not help to solve the color difference, and secondly, the hue of the composite film cannot be controlled. Thirdly, there is no correct way to train the color matching level of employees. Our suggestion is to avoid using ink systems from different manufacturers for color mixing before color mixing. It is best to use inks from the same manufacturer for color mixing. The colorist must fully grasp the hue of each color ink, which is conducive to Control during the color adjustment process. If you use the remaining ink before color adjustment, you must first figure out the color of the ink and check whether the identification card of the ink is accurate. It is best to use a scraping stick to observe and compare the sample before adding it. Do it before adding. Weigh the good weight and record the data.
In addition, when adjusting the spot color ink and the depth of the character, you can also use the measurement method and the ink stick to adjust the color. When scraping the ink color sample, it must be uniform and have a white background, which helps to compare with the standard sample. When the hue is close to more than 90% of the standard sample, adjust the viscosity. We can do proofing, and then fine-tuning. It is worth noting that the accuracy of the data must be paid attention to during the color adjustment process. The accuracy of the electronic scale is very important for the subsequent summary of the process data parameters. After we have prepared the ink ratio data, we can quickly and effectively adjust the color after many production practices, and we can avoid the problem of color difference.
If your company has a color matching service team to do the above work, it will be very good. It is worth noting that we should be able to uniformly match the ink according to the size of the order, and it is best to complete the color matching at one time to avoid hue deviation caused by multiple color matching. Can effectively reduce the appearance of chromatic aberration and residual ink. When checking the color, sometimes the color looks the same even under ordinary light, but it looks inconsistent under another light source, so a standard light source should be used for viewing or color comparison.
Two: printing squeegee
The effect of printing squeegee on color difference? If the squeegee is frequently used in production, the working position of the squeegee will be changed, which is not conducive to the normal transfer of ink and color reproduction. ( We know it well when printing pink ink ) In addition, the pressure of the squeegee should not be arbitrary Change, our suggestion is that we should adjust the angle and position according to the printed plate and text before printing. The knife must be clean and neat, the angle of the squeegee is usually 50-60 degrees In between, the squeegee should pay attention to the uniformity of the three points on the layout, that is, the ink layer on the left, center and right should be consistent. In addition, pay attention to check whether the three points of the squeegee are balanced before lowering the knife, and there will be no wave shape and unevenness, which is very important for the stability of the hue of the printed matter. The purchase and quality of the scraper are the key !
Three: viscosity control
Before production, we should control the viscosity. It is best to adjust according to the estimated speed. After adding the solvent, wait for 10 minutes and complete the loop before starting production. When the product under the speed-up production inspection meets the product quality requirements, we can measure the viscosity at this time to make the standard viscosity value for this product. This value needs to be accurately recorded in time and the entire product is controlled according to the data, which can be effective Reduce the hue deviation problem caused by the change of viscosity. We should pay attention to the method of measuring the viscosity. Usually, we use the ink in the ink tank or the ink basin to measure the main body. Before measuring, we must clean the No. 3 viscosity cup so that it can be accurately measured.
In the normal production process, we suggest to conduct a random check of the viscosity every 20-30 minutes. The captain or operator can adjust the viscosity according to the change of the viscosity value. When adjusting the viscosity of the ink and adding solvent, be careful not to directly impact the ink, so as to avoid damage to the normal system of the ink, separation of the resin and the pigment, which causes the printed matter to bloom, and the color reproducibility is not enough.
Four: production environment Â
When the relative humidity of the workshop is controlled, it is more appropriate to control it between 55% and 65%. If the humidity is too high, it will affect the solubility of the ink, especially the transfer of the shallow mesh area cannot be completely normal. Reasonable control of relative humidity can improve the control of the printing effect and color difference of the composite film ink.
Five: raw materials
Whether the surface tension of the raw material meets the standard determines the wetting and transfer effect of the ink on the substrate, and also affects the color rendering effect of the ink on the composite film, which is also one of the factors that affect the color difference. Ensuring the quality of raw materials is a prerequisite for quality improvement , and it is critical to select qualified suppliers !
Six: The promotion of quality awareness
Quality awareness: refers to a perception of quality by production and quality control personnel. This perception must be strong, embodied in work details. In terms of controlling chromatic aberration, it is mainly to improve the quality awareness of the employees, pay attention to details in the work, and cultivate quality concepts. For example, when strictly implementing the proof and reaching 90% between the standard samples, the production can be started. Cooperate with quality inspection personnel to do the first inspection work. In production, strict requirements are imposed on team members to implement a quality control system. When changing the hue of ink during production, pay attention to the cleaning details of the ink basin, and pay attention to whether the bottom plate of the doctor blade and the clamping strips at both ends are replaced or cleaned. If these small details are not noticed during production, color mixing will occur between the hues, resulting in discoloration of the color, resulting in color difference.
Color difference will inevitably appear in the printing of composite films. How to avoid or reduce the occurrence of color difference is the focus of our thinking. Through the analysis of the above factors, we can find ways to improve it, and we can further avoid color difference. , The method of controlling chromatic aberration, our principle is prevention first, and improvement secondary. Only by standardizing the source and sample management can we reduce and avoid chromatic aberration, so that there is no obvious chromatic aberration between the products of each batch. Only by paying attention to detailed operations in production and management of process data can we achieve better and stable Control the quality of products and make better products, thereby enhancing the comprehensive competitiveness of enterprises. (Source: Author: Tang Yongqiang micro-channel public number: Yongqiang Consulting)
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