The 3 Types of Plasma for Activating Polypropylene
There are 3 primary plasma system options for treating polypropylene:
大气血浆 该方法利用electrically-energized空气或gases that are passed through a nozzle at surrounding atmosphere or normal pressure using a pulsed electric arc generated by high voltage discharge. It is generally used for spot treatment of materials or low area in-line processing because it does not require a vacuum chamber and integrates well with a manufacturing assembly process.
低压Plasma This type of system generates plasma in a chamber that has been evacuated and then injected with small amounts of gas – usually oxygen, argon, hydrogen, nitrogen, or air. This method is better-suited for large batch parts processing and can easily handle difficult geometries.
电晕等离子体 Corona treatment is an electrical process that uses ionized air to increase the surface tension. Corona plasma is generated by the application of high voltage to an electrode that has a sharp tip where the plasma forms. This method is typically used for in-line wider area manufacturing applications that require a lower shift in surface energy.
Ways Manufacturers use Plasma to Activate Polypropylene
How Much Does Plasma Activation Improve Wettability of Polypropylene?
Wettability is a surface characteristic that is defined as the tendency of a fluid to spread or adhere to a solid surface and the ability of that surface to hold contact with it. One way to measure wettability is to use a test that registers a unit of force called a dyne.
Most manufacturing applications in which good wettability is desired require at least 72 dynes as a benchmark for acceptable product performance – a result difficult to achieve with polypropylene’s inherent low surface energy. By activating the surface of the polypropylene with plasma, its surface energy can be increased from 28 dynes to more than 105 dynes – well beyond the acceptable performance level. This significant improvement increases the number of manufacturing applications for polypropylene and its value as a versatile raw material, reinforcing its reputation as a workhorse of the thermoplastic industry.
Atmospheric, low-pressure, and corona plasma systems are all well-suited for production line integration. Flexible, versatile, and streamlined for manufacturing use, these methods are efficient and effective, capable of providing highly accurate, automated, and reliable service in high-volume production environments. Plasma activation of polypropylene on an automated production line can occur at rates of 100 to 400 mm/second, and batch processes can occur in process times of less than 10 minutes for a large batch of parts.
Unlike other surface treatment technologies that produce toxic by-products and pose health risks for workers, plasma technology is a cost-effective solution that does not produce any volatile organic compounds, providing a safe industrial hygiene environment that protects worker health.
Manufacturing process development using plasma to treat polypropylene is simple to implement and is a highly reliable form of surface treatment. The combination of polypropylene’s popularity and the availability of high-quality, cost-efficient plasma systems make them a perfect combination for developing and manufacturing new and innovative products.
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