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Printing Competence

17 The polymerization process can be inhibited by atmosphe- ric oxygen that is present on the surface of the coating medium during cross-linking.This leads to lower speeds and lower degrees of cross linking. During inertization, the atmospheric oxygen is replaced by an inert gas such as nitrogen. Properties of inertization: Process speed: Polymerization is unaffected by oxygen, which means that the line speed can generally be increased. Packaging: In an inert atmosphere the amount of photoinitiators can be reduced to a minimum. Surface: The surface properties, such as hardness and resistance to solvents or scratches, are increased considerably by inertization. Systems with long-wave photoinitiators can also be used with this technology.Thus inertization is an interesting variant for UV-LED curing, too. Inertization for UV processes

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