October, 2023
www.us -
tech.com
Openair-Plasma: A Versatile and Reliable Solution for the Electronics Industry
Continued from previous page
For this reason, Openair-Plasma technology has the reputation of a process that seems to be only applicable for large series production. But this is not the case, because plasma applications can also be used efficiently for small and medium-sized production series. The entire process is easily integrated and controlled.
Process Control Often, manufacturers in the electronics
industry will only implement a process step if that step can be guaranteed for each and every component. This requirement is met by Plasmatreat’s various process control modules and its PCU (Plasma Control Unit) which contains various quality assur- ance modules. Valuable informa- tion is collected on the use of the plasma process and the individual parameters as well as on the con- dition of the jet head and, in the case of rotary jets, on the condi- tion of the motor and the bear- ings.
In addition, the output of the
generator is continuously moni- tored and fluctuations in the mains voltage do not affect the plasma output. Thanks to this process control, customers can have traceability and repro- ducibility at all levels. Increasing packing densities
on printed circuit boards and the resulting growing miniaturiza- tion, require a rethinking of sur- face treatment because the demands on electronics will con- tinue to grow. Particularly in the case of miniaturization, the risk of short circuits must be mini- mized, which brings surface cleaning into focus. This involves micro-cleaning
of contact surfaces, such as the bond pad before wirebonding or the ultra-fine cleaning of glass surfaces in display assembly. This is used in the production of components and LEDs. Even the slightest organic impurities impair the quality of metallic compounds and thus also the function and service life of the component. Therefore, the re - moval of oxide layers on metal surfaces is a typical application in the field of surface cleaning. Furthermore, activation by
plasma is an important process, as surfaces are stimulated to form more stable bonds with other materials. Thus, conformal coating lacquers and casting compounds can form a very sta- ble bond with the respective sur- faces. For this reason, there is a growing demand for Openair- Plasma for the preparation of protective coatings. In general, the application of
conformal coating materials has many variables that can affect the final quality. Typical prob- lems are bubbles, orange peel, wetting, uneven coatings and
Delamination without surface treatment with Openair-Plasma.
Page 59
delamination. Openair-Plasma can serve as a reliable tool to help prevent all these potential defects and widen the process win- dow for coatings in general.
Sealing and Coating Similar requirements apply prior to the
sealing of connectors and sensors. These components will often be exposed to harsh conditions and must therefore be hermetical- ly sealed by the encapsulation or potting material. Due to the specially developed plasma jet and the selective use through the precise positioning process, plasma activa- tion ensures a strong bond between the dif-
ferent materials without affecting the Continued on page 63
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