In the modern printing industry, Corona Roller is a key equipment and is widely used in various printing links. Its main function is to improve the adhesion and adhesion performance of the material surface through corona discharge treatment, ensuring the smooth progress of the printing process and the high-quality output of printed products.

This article will discuss in detail the importance of Corona Roller in the printing industry, explain its application and role in specific printing links.

What is a corona roller?

Definition of Corona Roller:

Corona Roller is a device that treats the surface of a material through corona discharge. Corona discharge is a high-frequency and high-voltage discharge phenomenon. When the air between the high-voltage electrode and the surface of the material is ionized, corona discharge is formed, thereby changing the physical and chemical properties of the surface of the material. Corona Roller is usually composed of a high-voltage electrode, a roller body and a corona treatment device. The high-voltage electrode generates corona discharge on the surface of the material to achieve surface modification of the material.

Working principle of Corona Roller:

The working principle of Corona Roller is based on the corona discharge effect. The specific steps are as follows:

1. High-voltage electrode generates electric field: The high-voltage electrode of Corona Roller applies high-frequency high-voltage electric field to form a strong electric field environment.

2. Air ionization forms corona: Under the action of high voltage, the air between the electrode and the material surface is ionized, resulting in corona discharge phenomenon.

3. Surface modification: Active particles such as high-energy ions, electrons and free radicals generated during corona discharge react with the material surface to change the chemical composition and physical structure of the material surface.

4. Improve adhesion: After corona treatment, the polarity and wettability of the material surface are significantly improved, thereby enhancing the adhesion of the material surface to ink, coating and adhesive.

Why does the printing industry need to use Corona Roller?

Corona Roller plays an indispensable role in the printing industry, mainly in the following key links: pre-press processing, printing process and post-press processing. In each link, Corona Roller plays a role in improving the adhesion and adhesion performance of the material surface to ensure printing quality and efficiency.

1. Prepress treatment:

Prepress treatment is an important part of the printing process, which aims to make full preparations for the upcoming printing. For many printing materials, especially plastic films and some special papers, their surfaces usually have low polarity and low surface energy, resulting in poor adhesion with inks and coating materials. This requires modification of the material surface before printing.

The role of Corona Roller in prepress treatment:

The role of Corona Roller in prepress treatment is mainly reflected in improving the polarity and surface energy of the material surface, enhancing the adhesion of inks and coatings, and reducing printing defects:

    ● Improve the polarity and surface energy of the material surface: Through corona treatment, the surface polarity and surface energy of materials such as plastic films and special papers are significantly improved, and their adhesion with inks and coating materials is enhanced.

    ● Enhance the adhesion of inks and coatings: The surface of the material treated with Corona Roller can better combine with inks and coating materials to ensure the clarity and durability of the printed pattern.

    ● Reduce printing defects: Through corona treatment, printing defects caused by insufficient adhesion, such as ink peeling, uneven printing, etc. can be effectively reduced, and printing quality can be improved.

2. Printing process:

The printing process is the process of transferring ink or coating materials to the surface of printing materials to form patterns or texts. During the printing process, the adhesion and adhesion properties of the material surface directly affect the printing effect and the quality of printed products. For some materials that are difficult to adhere, such as plastic films and metal foils, the adhesion problem during the printing process is particularly prominent.

The role of Corona Roller in the printing process:

The role of Corona Roller in the printing process is mainly reflected in improving ink adhesion, improving printing effects, and reducing printing defects:

    ● Improve ink adhesion: Through corona treatment, the polarity and surface energy of the surface of the printing material are improved, the adhesion of the ink is enhanced, and the clarity and color vividness of the printed pattern are ensured.

    ● Improve printing effect: The surface of the material treated with Corona Roller is smoother and more uniform, reducing the diffusion and penetration of ink during the printing process, and improving the printing effect and quality.

    ● Reduce printing defects: Corona treatment can effectively reduce printing defects caused by insufficient adhesion, such as ink peeling, uneven printing, etc., and improve printing quality and efficiency.

3. Post-printing treatment:

Post-printing treatment is the last link in the printing process, which aims to further process and treat the printed matter to improve its appearance and performance. Post-printing treatment includes lamination, calendering, cutting, bonding and other steps. Each step puts higher requirements on the adhesion and adhesion performance of the material surface.

The role of Corona Roller in post-printing treatment:

The role of Corona Roller in post-printing treatment is mainly reflected in improving lamination adhesion, enhancing adhesion performance, and improving processing effects:

    ● Improve lamination adhesion: Through corona treatment, the polarity and surface energy of the printed material surface are improved, the adhesion of the lamination material is enhanced, and the uniformity and firmness of the lamination effect are ensured.

    ● Enhanced adhesion performance: The surface of the printed material treated with Corona Roller is easier to bond, which improves the sealing and durability of the printed matter and ensures the quality and life of the printed matter.

    ● Improve processing effect: Corona treatment can effectively improve the surface properties of printed materials, ensure the smooth progress of post-press processing, and improve processing effects and product quality.

Conclusion

As an efficient, reliable and environmentally friendly surface treatment equipment, Corona Roller plays an important role in the printing industry. Through corona treatment, the surface adhesion and adhesion properties of printed materials are significantly improved, providing a reliable guarantee for the smooth progress of the printing process and the high-quality output of printed products.

Whether in pre-press processing, printing process or post-press processing, Corona Roller provides strong support for the high quality and high efficiency needs of the printing industry. This also explains why the printing industry needs to use Corona Roller and its key role in specific printing links.