Atmospheric plasma plastic surfaces

Plasma Gas state (also called fourth dimension) from a mixture of electrically charged ions and neutral atoms/molecules. Results from plasma discharge mainly used for surface pretreatment of plastics (q.v. atmospheric plasma). 

The PlasmaTreat process introduces active carboxylate, ether, ketone or other oxygen-containing polar groups on the plastic surface without the use of a primer. For example, plasma treating of polypropylene increases the surface tension from 30 to 60 mN/m. The substrate to be bonded is briefly passed under a potential-free plasma flame at atmospheric pressure, thus providing good wettability and allowing application of the adhesive immediately (Fig. 51). The substrate retains its reactivity for adhesion for more than 7 days. 

Due to their remote operation, plasma jets are particularly suited for treatment of three-dimensional (3D) structures and for selective surface modifications of specific parts. The treatment of plastics by small-sized atmospheric plasma jet sources based on RF discharges was reported in Ref. [44]. 

Parbhoo B. Surface treatment and engineering of plastics by on-line atmospheric plasma for Ind App. In Joining Plastics 2006 Conference Proceedings Second International Conference on Joining Plastics. London, England 2006 25—26. 

Villermeta A, et al. Aldyne surface treatment by atmospheric plasma for plastic films converting industry. Surf Coatine Tech 2003 174-175, 899-901. 

In spite of a common use of ozone application together with various surface modification techniques, such as corona and atmospheric plasma, the influence of the combined action on the most popular plastics has not been quantified by exhaustive experimental data. Such a discussion regarding to the use of ozone with corona or of ozone with atmospheric plasma on heat seal strength will follow. 

R. Wolf, Advances in Adhesion with COj-based Atmospheric Plasma Surface Modiflcation , Society of Plastics Engineers ANTEC Proceedings, May, 2007. 

Glogauer [34] has reported on how an innovative atmospheric-pressure plasma technique allows in-line rubber and plastic surface treatment processes to become fully automated with total process control. The new process is claimed to achieve microfine cleaning, high surface activation and nanocoating in a more cost-effective and environmentally friendly way than traditional plasma activation techniques. 

Atmospheric pressure plasma Physical-chemical procedure for surface pretreatment, in particular of plastics. It is based on the development of an ionized gas atmosphere by high voltage, and leads to the formation of active surfaces. In contrast to the low-pressure plasma, it works at atmospheric pressure. 

In the impact test, a spherical particle was shot onto the surface of atmospheric pressure plasma spray coat specimen. At shooting speeds of 550 m/s and 620 m/s, no radial crack was seen at the point of impact imlike the data in the literature, though spray coating film fell out of the surface immediately below the impact point (Fig. 3). The observation with an EPS A, shown in Fig. 4, gave a removal of spray materials immediately below the impact point and a buildup in its periphery. In case of substrate only, similar morphology of crater and ridge was observed due to plastic deformation" . ... 

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