Technology of thermally sprayed anilox rolls: State of art,problems, and perspectives |
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Authors: | L Pawlowski |
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Affiliation: | (1) Université d, Artois, Faculté des Sciences Appliquées, Laboratoire Laser-Plasma-Matériaux, F-62400 Technoparc Futura, Béthune, France |
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Abstract: | This paper deals with the surfacing technology of ceramic anilox rolls. The rolls are used in the printing industry to transport
the precisely determined quantity of ink in the flexographic printing machines. The technology of roll surfacing is discussed
by taking the following aspects into account: preparation of the powder to spray the ceramic coating; thermal spraying of
the duplex (bond coating and ceramic top coating); postspray finishing by grinding and polishing; and laser engraving. The
powder used as the top coating of the aniloxes is chromium oxide. This powder might be prepared by such techniques as agglomeration,
fusing, and crushing, etc. The preparation technique influences coating properties, such as microstructure (tested with SEM,
OM, XRD, and XPS), open porosity, microhardness, and modulus of elasticity. Comparison of these properties enables optimum
powder preparation techniques to be found. APS technique is used to coat the anilox rolls. Optimization of the plasma spraying
parameters is discussed. Aniloxes are submitted to the grinding and polishing of the ceramic coating before laser engraving
occurs. The final roughness of the finished coating is discussed in view of an optimum absorption of the laser light energy
at engraving. Possible ways of reducing the spraying time are discussed, and future research toward improving the anilox roll
quality is proposed. |
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Keywords: | anilox rolls microstructure of Cr2O3 coatings plasma spraying of ceramics properties of Cr2O3 coatings |
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