Depending on the environmental conditions, airborne contaminants are deposited over time in all areas. This also applies to controlled environmental conditions - such as in cleanrooms. Although the air in cleanrooms is filtered and monitored, contamination is still deposited on critical components, products and surfaces over time. It is therefore common practice to protect these with covers, depending on the process requirements.
To ensure the required surface cleanliness under such a cover, material, geometry and tightness are decisive factors. Provided that the correct cover has been selected, it protects the objects or surfaces underneath, regardless of any other activities in the immediate vicinity. The same applies if something is to be stored under such a cover for a longer period of time. However, contamination will accumulate on the cover over time. If the cover is removed, the risk automatically increases that the contaminants collected on the cover will come loose again and also swirl around due to the removal movement. Inevitably, this also means that both the object to be protected and the neighbouring surfaces are exposed to a not inconsiderable risk of contamination due to this particle turbulence.
These contamination risks are presented and analysed in the presentation. With the help of a study, these risks were recorded and evaluated with measurement data. Based on the data obtained, an optimised process resulting from this (synonymous with a low risk of contamination) will be presented.

In short: an optimised cover system combined with correct handling significantly reduces the risk of contamination when removing the cover.