How to prevent ink from falling off during the printing process of BOPP synthetic label paper?

BOPP synthetic label paper can prevent ink from falling off during the printing process by addressing the following aspects:

1、 Optimize printing process parameters

Choose the appropriate printing method: Based on the ink type and label paper material, choose the appropriate printing method, such as gravure printing, flexographic printing, or screen printing. These printing methods can better adapt to the surface characteristics of BOPP synthetic label paper, ensuring uniform ink adhesion.

Adjusting printing pressure: The magnitude of printing pressure directly affects the transfer effect and adhesion strength of ink. Insufficient pressure and ink transfer may result in inaccurate printing; Excessive pressure may damage the surface of the label paper and affect the adhesion of ink. Therefore, it is necessary to adjust the printing pressure to a suitable range to ensure that the ink can be evenly and completely transferred to the surface of the label paper.

2、 Select high-quality ink

Specialized ink: Select ink specifically designed for BOPP synthetic label paper, which typically has better adhesion and drying properties, reducing the risk of ink detachment.

Ink compatibility: Ensure that the ink matches the material of BOPP synthetic label paper, avoid using ink that is incompatible with the material, and reduce the possibility of ink detachment.

3、 Perform surface pretreatment

Coating treatment: Apply a special coating material on the surface of BOPP synthetic label paper to increase its surface tension and improve ink adhesion. The selection of coating materials should be matched according to the ink type and label paper material.

Corona treatment: Perform corona treatment on BOPP synthetic label paper to activate its surface, increase polar functional groups, and thereby improve surface energy and ink adhesion. However, it should be noted that the corona effect will decay over time and needs to be reprocessed regularly.

4、 Control the production environment

Temperature and humidity control: Maintain the temperature and humidity of the production environment within an appropriate range to avoid deformation or shrinkage of BOPP synthetic label paper due to temperature and humidity changes, which may affect the adhesion of ink.

Clean environment: Keep the production environment clean, avoid dust and other impurities from contaminating the surface of label paper, and affect the adhesion effect of ink.

5、 Enhance UV drying effect

UV lamp power and irradiation time: Ensure that the power and irradiation time of the UV lamp are sufficient to allow the ink to fully dry and cure. Poor UV drying is one of the common causes of ink detachment.

Regular replacement of UV lamps: Regularly inspect and replace aging UV lamps to ensure stable and reliable illumination effects.

In summary, measures such as optimizing printing process parameters, selecting high-quality ink, surface pretreatment, controlling production environment, and enhancing UV drying effect can effectively prevent ink detachment during the printing process of BOPP synthetic label paper.