First of all I would like to start with a silde about coatings that didn’t perform to well… I would like to show you this because you can have a very good coating, but if you neglect some crucial steps….
De coating mag zeer goede eigenschappen hebben op het finaal product, maar als deze coating slecht is aangebracht dan zal de coating ook slecht presteren
Further, Before application of a coating, we have to consider all aspects and circumstances of the to be coated parts. What are the expectation of the coating? Which kind of function does the coating need to provide? Where is the coating exposed to?
Even more so, what are the limition of the workobject?
All these questions need answering. TO do so we need to walk through the complex complete coating process
Coating process is een heel complex gebeuren…..
Adhesion of coating to substrate is an absolute prerequisite for the servicability of the coating.
The demo shows a treated and untreated atmospheric plasma on PMMA. After wards, water was sprayed to show you the effect of surface activation. Due to the plasma, the surface energy is increased by incorporatioin of polar groups.
Strictly speaking, pretreatment also includes cleaning The pretreatment of the samples is surface dependant
Just as diverse as the various substrates that can be coated, is the choice of methods by which the coating can be applied to these usually pretreated surfaces.
Bron:http://www.spraygunworld.com/Information2/AAA/Airless%20vs%20AAA.html From small to medium sized coating capacities.The maximum output can be increased by dipping more than one panel in the same time. Depanding on the product withdrawal and drying will limit the maximum output capacity. However up to 150 panels per hour are possible. Uniform coating thickness ± 1 µm. Coating thickness can be varied simple and clearly (e.g. 7 µm to 12 µm) just by changing the withdrawal velocity. To get reliable and continously good quality only very few and easy to handle parameters need to be controlled. (Viskosity, temperature, withdrawal velocity). No coating tool is required! To cover or to fill holes or gaps within a well defined range is not a big challenge using an adequate resist. (State of the technology) Coating electrolytic galvanized 3-D structures is possible. (State of the technology)Thin panels can be coated without limitation. (State of the technology) Flexible boards which ar not planar a 100% can be coated without any quality loss. If specified even thick panels (e.g. 4 mm) can be coated. ( five sides) Basicly dust and aerosols can be reduced to a minimum by the right machine concept and well selected coating and drying modules.Especially for laser direct imaging (LDI) with highly collimated laser light it is a must. Suiteable resists are made to be used and kept in dipping systems for month without any cleaning efforts. Compared to roller coaters costs for maintenance and usage are very low. The compact construction reduces the required spot.