How stable is the color of copperplate paper adhesive labels after printing?

The color stability of copperplate paper adhesive labels after printing is relatively good, but it is also affected by various factors. The following is a detailed analysis of the color stability of copperplate paper adhesive labels after printing:

1、 The reason for good color stability

Excellent printing performance:

Copperplate paper adhesive label paper has a smooth and delicate surface, bright and full printing colors, good visual effects and reproducibility, and can meet high-quality printing needs.

Using high-quality ink and printing technology can ensure that the colors on the label are bright and long-lasting.

Wear resistance and stiffness:

Copperplate paper adhesive label paper has good stiffness and wear resistance, is not easily deformed or damaged, and can maintain a stable shape in various environments.

This helps to reduce color fading or changes caused by friction or scratching during transportation, storage, and use.

2、 Factors affecting color stability

Environmental factors:

Long term exposure to strong sunlight may cause ink to fade due to UV radiation. This fading phenomenon is particularly evident in light colored inks and four-color plate overprinting, with yellow and red colors fading faster.

Adverse environmental conditions such as high temperature and humidity may also accelerate the aging of ink, leading to color changes.

Paper characteristics:

The absorbency of copperplate paper has a direct impact on the printing effect. If the paper absorbs too much ink binder, it may cause a decrease in the saturation of the imprint, thereby affecting the stability of the color.

The pH value of paper can also affect the acid and alkali resistance of ink. Ink made from general inorganic pigments has poor acid and alkali resistance, while organic pigments have better acid and alkali resistance. If the paper is weakly alkaline, it may react with ink, causing color changes.

Printing process:

The emulsification phenomenon of ink may affect the stability of color. During the offset printing process, ink emulsification is inevitable when wetting the blank part of the printing plate with a wetting solution. The color of emulsified ink may decrease, but it may return to its original color after the water evaporates.

Factors such as pressure and ink layer thickness during the printing process may also affect color stability. If the pressure is insufficient or the ink layer is too thin, it may cause the ink to not be fully transferred to the paper, thereby affecting the saturation and stability of the color.

3、 Methods to improve color stability

Choose the appropriate ink:

Choose high-quality ink that is resistant to light, acid and alkali, and aging to improve the color stability of labels.

Optimize printing process:

Control factors such as pressure and ink layer thickness during the printing process to ensure that ink can be fully transferred to the paper.

Avoid excessive emulsification of ink to ensure bright and long-lasting colors in printed materials.

Strengthen post-processing:

Performing post-processing such as laminating or glazing on printed materials to improve their waterproof, oil resistant, and wear-resistant properties, thereby extending color retention time.

Pay attention to the storage environment:

Store printed materials in a dry, cool, and well ventilated environment, avoiding prolonged exposure to strong sunlight or harsh environmental conditions such as high temperature and humidity.

In summary, the color stability of copperplate paper adhesive labels after printing is relatively good, but it is also affected by various factors. In order to improve color stability, it is necessary to choose appropriate inks, optimize printing processes, strengthen post-processing, and pay attention to storage environments.