Printing and color are one of the most important factors in customized printing packaging boxes. Every custom printing and packaging box factory has a complete printing and color management system. Without this management system, there would be color differences in every production. For major brand customers, if they cannot match the color of each batch of customized printed packaging boxes, it will have a serious negative impact on their brand power. Here is our summary of matters related to printing colors:
Sampling is the best way to match color differences. Without sampling, there is no basis for color matching, and relying solely on the documents sent is unreliable. Many printing technicians have conflicts with customers over color matching issues! Printing color samples are an indispensable part of the printing process, which directly affects the final appearance and quality of the printed product. By printing color samples, it is possible to ensure color accuracy and consistency from design to final printed products,
Making a sample before printing is a good way to solve color cast in printing
Then color sample comparison can be conducted during the printing process of the final bulk production,
Ensure color consistency. If there are slight deviations, adjust the ink ratio or the printing master to adjust it in a timely manner according to the on-site situation.
Color sample refers to a small sample printed out during the design drawing or production of a product for the convenience of checking and adjusting color effects. Color samples can accurately display the color of products, helping designers and production personnel better control color effects and ensure that the final product meets specific requirements.
Color samples play an important role in industrial design, printing, clothing production, and other fields. With the help of color samples, it is possible to predict the true color of products, ensuring that there are no errors in the design and production process. In addition, color samples can be used for pre-sales display, business negotiations, and customer confirmation, providing convenience for business cooperation.
The main reasons for color difference in different printing materials include temperature and humidity, pH value, properties of printing machine and ink, properties of paper, and technical factors during the printing process. If we want to print paper, try to provide the factory with paper color samples as much as possible. If it is other materials, it is difficult for the factory to control!
Reason: The ink absorption, glossiness, and whiteness of different papers can affect the performance of printed colors,
Paper with strong ink absorption will result in dull colors, while paper with high glossiness will have bright colors.
Solution: Select paper that matches the design requirements,
And conduct a paper adaptability test before printing.
If necessary, the viscosity of the ink can be adjusted to adapt to the characteristics of the paper.
Paper whiteness: The whiteness of paper directly affects the performance of printed colors. Paper with higher whiteness can reflect more color light, making the printed matter more vivid and clear, while paper with lower whiteness may cause color cast because they absorb some color light, affecting the accurate appearance of colors.
Paper absorbency: The absorbency of paper, also known as ink absorption, has a significant impact on the color performance of printed materials. Highly absorbent paper can make ink colors easily discolored and lack glossiness, while weakly absorbent paper may cause ink adhesion to be weak, making the imprint difficult to dry and easily causing dirt on the back of printed materials.
Poor ink blending: Poor ink blending or direct use of unfiltered old ink may cause ink skin to mix in, affecting the uniformity of the cold layer. The solution is to filter the ink before use to ensure ink quality. This leads to significant color differences in printing!
Reason: Excessive or insufficient ink volume during the printing process, resulting in inconsistent ink layer thickness
Affects the saturation and color expression of colors.
Solution: Adjust the ink volume to ensure consistent ink layer thickness for each color, and use standard ink film thickness values for control.
Improper handling of printing plates: Incomplete removal of old ink on the printing plate or damage to the front end of the plate can cause marks during printing, affecting the uniformity of the ink layer. The printing plate should be thoroughly cleaned and the front end of the plate should be protected to avoid damage.
Ink viscosity and thickness: The viscosity and thickness of ink directly affect the uniformity of the ink layer. Excessive viscosity or thick ink layer can lead to uneven ink color. The viscosity and thickness of the oil should be adjusted to ensure a moderate printing ink layer, in order to prevent the print from sticking and ensure the uniformity of the ink color quality.
Rubber roller problem: Poor glue accuracy, improper position adjustment, or hard glue can all affect the uniform distribution of the ink layer. Ensure the good condition and correct adjustment of the rubber roller.
There are many reasons that can cause changes in ink color. Sometimes different ink making formulas can lead to different colors, and sometimes improper cleaning of ink can cause the ink from the previous color to flow into the next color, resulting in uneven color. Printing machines often encounter ink with varying shades of color changes!
Reason: The color of the ink is not pure or there is color difference between batches, and the concentration of pigments in the ink is not consistent, which can also lead to color cast.
Solution: Use the same brand and batch of ink, and mix and test it before printing to ensure that the ink meets the standards.
Post press treatments such as lamination and polishing can cause changes in hue and density. These processing methods will increase the reflection and diffuse reflection on the surface of the product, thereby affecting the color density.
The solvents and other chemicals used in chemical processing may also alter the color of the ink layer. For example, using a light agent to adjust the color will directly affect the hue.
The phenomenon of thousand drop density refers to the process of ink transitioning from wet to dry state, where the color appears dull due to changes in surface reflection. After drying, the surface reflection is mainly diffuse reflection, resulting in a dull appearance in color.
The main reasons for color difference between RGB and CMYK include differences in color modes and application media, as well as various uncontrollable factors during the printing process. The RGB mode is based on the three primary colors of red, green, and blue, and is suitable for computer, mobile phone, and other display screens, capable of presenting a wide color gamut. The CMYK mode is based on the four colors of cyan, magenta, yellow, and black, and is mainly used for printing
Choose the correct color mode: During the design phase, select based on the output medium
Appropriate color mode. For digital display devices such as screens,
RGB mode should be used; For printed materials, CMYK mode should be used
Preview and Comparison: Before color conversion, use the preview function to view the color differences between RGB and CMYK, in order to adjust and optimize colors for optimal results.
Understanding color space: The RGB color space is relatively large. It can present a wider range of colors, while CVNK colors are smaller when in phase. When performing color conversion, it should be noted that some bright and saturated colors may be compressed and altered.
Mixing colors: During the conversion process, try mixing some colors to approximate the original RGB colors. By gradually increasing or decreasing the percentage of CMK colors, find the combination that is closest to the original color.
Step by step conversion: If you need to convert an RGB image to CMYK, you can perform the conversion step by step and check the color differences in each step. Through this method. Fine adjustments can be made at each stage to reduce overall color difference.
The machine is old or the ink roller and drum have not been replaced and maintained for a long time: the pressure of the ink roller and drum is unbalanced, and the ink balance is difficult to control, resulting in color difference.
Runban liquid was not proportioned according to technical parameters, resulting in abnormal ink emulsification and color difference.
reason:
Factors such as timeline, exposure time, and film quality affect color accuracy during plate making.
Inaccurate color separation and improper separation of four colors (CMYK) result in poor color reproduction during printing.
Handling method:
Ensure the accuracy of plate making equipment, strictly control exposure time and lighting conditions.
Use high-quality film for plate making to ensure accurate color separation.
Perform color separation correction through a color management system to optimize the reproduction effect of printed colors.
Printing process issue: Different printing processes have different effects on the re viewing of colors. Improper process selection or inaccurate adjustment of process parameters may also lead to color differences.
Improper adjustment of printing machine: Color adjustment of printing machine is a key step to ensure accurate color fusion of printed materials. Improper settings of parameters such as ink volume control, ink level, hue, brightness, and contrast color can all lead to color differences.
Shutdown and restart: The ink cannot be consistent during shutdown and restart, which may also cause color difference.
The above is a summary of all the knowledge points related to printing for ITIS custom printing packaging box factory. This is the basis for our employees' work in production operations, and also some reasonable suggestions that we can provide to customer designers and related personnel. This saves customers more time and costs.
