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Investigation of the behaviour of a Newtonian liquid regarding the picture framing coating error
Author(s) -
Sommer Oliver,
Hehemann Sven,
Wozniak Günter
Publication year - 2018
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201800069
Subject(s) - coating , framing (construction) , curvature , newtonian fluid , homogeneity (statistics) , materials science , optics , framing effect , homogeneous , mechanics , composite material , geometry , thermodynamics , mathematics , physics , psychology , social psychology , structural engineering , engineering , statistics , persuasion
We experimentally investigated the specific behaviour of Newtonian thin liquid layers at curved solid edges in a continuative investigation of the so‐called picture framing effect coating error. We used adapted laser‐induced fluorescence technique (LIF) to measure the layer thickness distribution for the examination of the underlying edge bead in a cross section. The main motivation is to find optimal combinations of influencing quantities to reduce the picture framing effect (edge beads) in order to achieve a homogeneous layer thickness distribution of the liquid coating on the surface of the substrate, especially at the edges. For this purpose, we varied the viscosity of the Newtonian liquid, the edge radii of curvature of the substrate and its orientation regarding the gravitational direction. The results, i.e. the edge bead dependencies on the tested parameters, are physically plausible. With these findings the picture framing effect as a whole is manipulable regarding a minimisation of the coating error.