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Atmospheric plasma has long been anticipated to become a major technology in surface treatment of polymers and fabrics. However, until this day, atmospheric plasma surface treatment is seldom used by the industry. The use of atmospheric plasma in the industry dates back to mid-19th century it was then used in the Siemens process to produce ozone. However, the use of atmospheric plasma for surface treatment is much more recent, it started in research laboratory in the late 80’s early 90’s. Due to the promising benefit of this technology the first generation of industrial solutions were rushed to the market only 10 years’ later while the technology was not yet mature. This led to disappointing performances of the first generation of atmospheric plasma: • high gas consumption • inhomogeneous (pin hole and backside) treatment
• low treatment speed • poor stability of the process in continuous 24/7 operation,
These drawbacks made atmospheric plasma solutions too expensive for most industrial applications. Another issue is the over expectation generated by some manufacturers who claimed to obtain high performance coating for industrial applications. The gap between users’ expectations (treatment speed in the hundreds of m/min) and the available solutions with treatment speed in the m/min range also hindered the use of atmospheric plasma for surface treatment.
16 March 2017
)'(, active since 2001 in atmospheric plasma technology, has
used its experience to develop an innovative plasma station: BLUEMACH. BLUEMACH has been developed from the ground up to be an atmospheric plasma station, it’s not a modified corona reactor.
This results in a highly-optimized process, overcoming all of the above- mentioned limitations that prevented a successful use at industrial scale.
CPI has developed a unique electrode - gas diffusor assembly using the latest manufacturing technology.
This allows CPI to have a very good control of the plasma chemistry and of the discharge homogeneity while limiting the consumption of gases.
Developments in reactor design and cooling system have solved the issue of process stability during continuous use of the reactor.
Thanks to BLUEMACH’s excellent control of the plasma chemistry it is possible to treat sensitive materials without damaging them.
The homogeneity of the discharge allows BLUEMACH to use high power density, without creating pin holes, backside treatment or Low Molecular Weight Oxidized Fragment (LMWOF).
The controlled atmosphere and discharge homogeneity enables CPI’s chemists and physicists to fine-tune the plasma for specific materials and applications.
This allows BLUEMACH to treat materials that cannot be easily treated by conventional corona/plasma treatment.
It’s common for some users to drastically increase the corona dosage when the required surface energy is not obtained.
This leads to the formation of a weak boundary layer of LMWOF at the material surface.
This LMWOF layer is responsible for the very poor adhesion results obtained on overtreated samples.
BLUEMACH’s controlled atmosphere and high power homogenous discharge allow to treat difficult materials such as PTFE, PLA, PEEK, … without damaging them.
The optimized process results in improved treatment performance for most materials (films, woven and non-woven).
Treatment speeds reach hundreds of meters per minute for common polymers and ageing is strongly decreased when compared to corona treatment.
Shelf life of more than 2 years has been obtained in some cases.
CPI team comprised of chemists engineers and physicists enables us to have an overall understanding of the plasma treatment process.
This unique approach and a close collaboration with a R to R machine manufacturer, allows CPI to offer its customers a complete solution: from the definition of the plasma chemistry to the delivery of a complete roll to roll treatment line.
uwww.cpi-plasma.com
BLUEMACH advantages: •Adapted and controlled chemistry
•Efficient gas use
•Homogenous treatment •High treatment speed.
www.convertermag.co.uk
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