What is the role of corona treatment in the printing of BOPP synthetic paper?

Corona processing plays a crucial role in the printing of BOPP synthetic paper, and its main role is reflected in the following aspects:

First, improve the surface tension

Principle: BOPP synthetic paper is a non-polar polymer, its surface tension is small, not easily infiltrated by most inks and solvents. Corona treatment uses high frequency and high voltage corona discharge on the plastic surface to generate low temperature plasma, which causes free group reaction on the plastic surface, and then increases its surface energy.

Effect: After corona treatment, the surface tension of BOPP synthetic paper is significantly improved, which can better adsorb and fix the ink, ensuring the clarity and durability of the printed pattern.

Second, enhance ink adhesion

Necessity: Due to the low surface tension of BOPP synthetic paper, the direct use of ink printing may lead to insufficient adhesion, prone to problems such as ink loss and decolorization.

Function: Corona treatment by changing the surface properties of BOPP synthetic paper, so that the adhesion between it and the ink is significantly enhanced, to ensure that the printed matter can maintain a good printing effect in the subsequent use process.

Third, improve the printing quality

Appearance effect: The surface of the BOPP synthetic paper after corona treatment is more uniform and delicate, which is conducive to the uniform distribution and penetration of the ink, thereby improving the overall appearance of the print.

Consistency: Corona treatment can ensure the consistency of the surface tension of BOPP synthetic paper, so that mass-produced prints remain highly uniform in quality.

Fourth, adapt to a variety of ink types

Compatibility: Corona treated BOPP synthetic paper can better adapt to various types of inks, including water-based inks, UV inks, etc., to meet different printing needs.

Fifth, precautions

Processing strength: Different BOPP synthetic papers may require corona treatment of different strengths to achieve the best printing results. Therefore, the parameters of corona processing need to be adjusted according to the specific situation in actual operation.

Timeliness: The effects of corona treatment may gradually diminish over time, especially during storage. Therefore, a secondary corona treatment may be required before printing to ensure print quality.

Environmental impact: Environmental factors such as humidity may also affect the effect of corona treatment, which needs to be paid attention to in actual operation.

In summary, corona treatment plays a crucial role in BOPP synthetic paper printing, and is a key step to improve printing quality and ensure ink adhesion.