How to solve the color difference in printing production? These six elements are crucial

Chromatic aberration refers to the difference in color. In daily life, we often say that the color difference refers to the phenomenon of inconsistent color when the human eye observes the product. For example, the printing industry, the difference in color between the printed matter and the standard sample provided by the customer.

In industry and commerce, accurate assessment of product color difference is a very important part. However, various factors such as the light source, observation angle, and the observer's own conditions during visual color measurement may cause differences in color evaluation.

There is a certain color difference in the printed matter. We can only make the printed matter close to the color of the design draft based on certain experience and judgment. So, how to control the chromatic aberration so that the printed product is close to the color of the design draft? Today, I will take you to understand how to control color difference through 6 elements in the printing process.

01

color grading

The printing and color matching link is the core content of the entire color difference adjustment. Usually, the printing technicians of many companies only pay attention to experience or their own feelings when color matching. It is neither a norm nor a unified standard. Just stay in a very primitive color grading state, 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; on the other hand, there is no proper skill in shaping the color matching ability of employees.

Before color matching, special attention should be paid to preventing the use of printing ink systems of different manufacturers for color matching. It is best to use printing inks from the same manufacturer for color matching. Control of ink during toning process.

If the remaining printing ink is used before toning, be sure to figure out the hue of the printing ink first, and check whether the identification card of the printing ink is correct. To add, the weighing should be strengthened before adding in order to record the data.

In addition, when adjusting the intensity of the ink, you can also use the metering method to adjust the color. When scraping the ink color sample, it must be well-proportioned, and it must be supported on a white background, which is helpful for comparison with the unified standard sample. When the hue reaches more than 90% of the unified standard, strengthen the viscosity adjustment. We can do the proofing, and then we can fine-tune it.

It is worth mentioning that special attention must be paid to the accuracy of the data during the color matching process. The accuracy of the electronic scale is very important for the subsequent summary of process data parameters. When the proportioning data of the printing ink is strengthened, the color can be quickly and reasonably adjusted through several practices, and the occurrence of color difference problems can also be avoided.

It is best to be able to uniformly color match 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 several color matching. The occurrence of color difference and remaining printing ink can be reasonably reduced.

When checking colors, sometimes the colors look the same under normal lighting, but they don’t look the same under another light source, so you should choose a uniform standard light source for color viewing or color comparison.

02

printing squeegee

If the squeegee is often moved in production and processing, 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 cannot be changed casually.

Before production and processing, it is necessary to adjust the angle and position according to the graphic conditions of the printed plate roller. The lower knife must pay special attention to the cleanness of the hand movements. The angle of the squeegee is usually between 50-60 degrees. The squeegee should pay special attention to the uniformity of the three points of the layout, that is, the ink layers on the left, middle and right should be the same. In addition, special attention should be paid to check whether the three points of the squeegee are balanced before the knife is lowered, and there will be no wavy pattern and one high and one low, which is very important for the hue stability of the printed product.

03

Adjustment of viscosity

Before production and processing, it is necessary to strengthen the adjustment of viscosity. It is best to adjust according to the expected machine speed. After adding solvent, it should be fully mixed before starting production and processing. To speed up the production and processing to check that the product that comes off the machine meets the quality standards, the viscosity test can be carried out at this time as the unified standard viscosity value of this product. This value must be recorded immediately and accurately adjusted according to the data of the whole single product, which can be reasonably reduced. Hue deviation caused by changes in viscosity.

Viscosity detection should pay special attention to its detection skills. Usually, the printing ink in the printing ink bucket or the printing ink basin is the main detection body. Before the detection, the No. 3 viscosity cup must be cleaned to facilitate accurate detection.

In the production process under normal circumstances, it is recommended to conduct a sampling inspection of the viscosity every 20-30 minutes, and the captain or technician can adjust it according to the change of the viscosity value.

When adjusting the viscosity of the printing ink and adding the solvent, special attention should be paid not to directly impact the printing ink, so as to prevent the system damage under normal printing conditions and the separation of the resin and the pigment, which will cause the printed product to bloom and the color reproducibility is poor.

04

Production Environment

The adjustment of the air humidity in the workshop, under normal circumstances, it is more appropriate for us to adjust it between 55% and 65%.

If the humidity is too high, it will affect the solubility of the printing ink, especially the transfer of the shallow screen area is difficult to show normally. Reasonable adjustment of air humidity has an improved effect on the adjustment of ink printing effect and color difference.

05

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, and also affects the color display effect of the printing ink on the film, and is also one of the factors that affect the color difference.

Guaranteeing the product quality of raw materials is a prerequisite for quality control. It is very important to choose qualified and reputable 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 and reflected in the details of the work. So in terms of adjusting the color difference, it is mainly to guide the employees to improve their quality awareness, keep improving in their work, and shape the concept of product quality.

For example: when the proofing is strictly observed and the standard sample reaches more than 90%, the production and processing can be started, and the quality inspector will be assisted in the inspection of the first piece when the first piece is made. In production and processing, the team members are strictly required to implement the quality management system. In production and processing, when changing the hue of printing ink, special attention should be paid to the cleaning details of the printing ink basin, and special attention should be paid to whether the bottom plate of the squeegee and the clips at both ends are not If it is replaced or cleaned in time, these small details, if you do not pay special attention in production and processing, will cause color mixing between hues, resulting in color discoloration, and then chromatic aberration.

Chromatic aberration is inevitable in packaging and printing. How to reduce the occurrence of chromatic aberration is the key to consider.

Using the specific analysis of the above factors, it is possible to find improved techniques, to further avoid chromatic aberration, and to control chromatic aberration. Only by achieving standardization in source and sample management can chromatic aberration be reduced and avoided, and each batch of There is no obvious color difference between the products; only by paying special attention to the detailed operation and the management of process data in the production and processing, can we make better products and improve the comprehensive market competitiveness of enterprises.