How to maximum ink adhesion when do screen printing on PP plastic bottles or caps

There are several ways to maximize ink adhesion on PP plastic bottles or caps:

1. Surface treatment: Before applying ink, it is important to properly clean and prepare the surface of the PP plastic. This can be done by using a cleaning solution to remove any dirt, grease, or other contaminants that may interfere with ink adhesion, such as flame treatment, or plasma treatment, corona treatment.

2. Primer: Applying a primer specifically designed for PP plastic can help improve ink adhesion. The primer creates a bonding layer between the plastic surface and the ink, ensuring better adhesion.

3. Ink selection: Choose an ink that is specifically formulated for use on PP plastic. These inks are designed to adhere well to the surface of the plastic and provide long-lasting, durable prints.

4. Proper curing: Make sure to properly cure the ink after application. This may involve using heat or UV light to ensure that the ink fully bonds to the plastic surface.

5. Testing: Before full-scale production, it is important to conduct adhesion tests to ensure that the ink adheres well to the PP plastic. This will help identify any potential issues and allow for adjustments to be made before production begins.

By following these steps, you can maximize ink adhesion on PP plastic bottles or caps, ensuring that your prints are durable and long-lasting.

As an experienced printing machine manufacturer, we must pay more attention if the sample is made of PP material. We must make sure the adhesion is OK through repeated testing. If cannot pass 3M test, we will give modifications on surface treatment, ink brand, curing power etc. In a word, to provide a qualified and workable machine to our clients.