1. Print Quality: The most important factor in judging the quality of a screen printing machine is the print quality. Look for machines that produce sharp, clear prints with consistent color and registration. 2. Speed and Efficiency: A high-quality screen printing machine should be able to print quickly and efficiently, with minimal downtime for setup or maintenance. 3. Durability: A good screen printing machine should be built to last, with sturdy construction and high-quality components that can withstand the rigors of regular use. 4. Ease of Use: A quality screen printing machine should be easy to set up and operate, with intuitive controls and user-friendly features. 5. Precision and Accuracy: Look for a screen printing machine that offers precise control over print placement and registration, to ensure that your prints come out exactly as you intended. 6. Customer Reviews: Before purchasing a screen printing machine, be sure to read customer reviews and testimonials to get an idea of the machine's performance and reliability in real-world use. 7. Warranty and Support: A reputable manufacturer should offer a warranty on their screen printing machines, as well as reliable customer support in case you encounter any issues or need assistance with your machine.

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.