Surface Treatment of BOPP Synthetic Label Paper

The surface treatment of BOPP synthetic label paper is a critical step that directly affects the printing effect, adhesion, and durability of the label paper. The following is a detailed introduction to the surface treatment of BOPP synthetic label paper:

1、 The purpose of surface treatment

Improving ink adhesion: Through surface treatment, the polarity of BOPP synthetic label paper surface can be increased, thereby enhancing ink adhesion and ensuring the clarity and durability of printed patterns.

Improving printing effect: Proper surface treatment can make the surface of BOPP synthetic label paper smoother, which is conducive to the uniform distribution of ink and thus improves the printing effect.

Enhanced durability: Surface treatment can also enhance the wear resistance, scratch resistance, and weather resistance of BOPP synthetic label paper, extending the service life of the label.

2、 Common surface treatment methods

Corona treatment:

Principle: Using high-frequency and high-voltage electric fields to discharge the surface of BOPP synthetic label paper, causing the molecular chains on the surface to break and form polar groups, thereby increasing the surface tension.

Advantages: Fast processing speed, good results, suitable for large-scale production.

Attention: During the processing, it is necessary to control the electric field strength and processing time to avoid damage to the surface of the label paper caused by excessive processing.

Flame impact treatment:

Principle: Using a high-temperature flame to rapidly heat the surface of BOPP synthetic label paper, causing the molecular chains on the surface to rearrange and form polar groups.

Advantages: Stable processing effect, suitable for label paper with high surface tension requirements.

Attention: Flame impact treatment requires strict control of flame temperature and treatment time to avoid label paper burning or deformation.

Plasma treatment:

Principle: High energy particles in plasma are used to bombard the surface of BOPP synthetic label paper, causing the surface molecular chains to break and form polar groups.

Advantages: Uniform processing effect, suitable for label paper with extremely high surface tension requirements.

Attention: Plasma processing equipment has a high cost and requires professional personnel to operate and maintain.

Coating treatment:

Principle: Apply a special coating material on the surface of BOPP synthetic label paper to improve surface tension and ink adhesion.

Advantages: The composition and properties of the coating material can be adjusted as needed to meet different printing needs.

Attention: Coating treatment requires strict control of the composition, concentration, and coating amount of the coating material to ensure consistency and stability of the treatment effect.

3、 Inspection after surface treatment

Surface tension test: Use a surface tension tester to test the surface tension of the processed BOPP synthetic label paper to ensure that it reaches the required surface tension value.

Ink adhesion test: Use an ink adhesion tester to test the ink adhesion of the processed label paper to evaluate its printing effect and durability.

Appearance inspection: Conduct a visual inspection of the processed label paper to ensure its surface is smooth, free from damage and stains.

In summary, the surface treatment of BOPP synthetic label paper is a complex and important process that requires the selection of appropriate treatment methods based on specific printing requirements and the performance characteristics of the label paper. Through scientific surface treatment, the printing effect and durability of BOPP synthetic label paper can be significantly improved, meeting the needs of various application scenarios.