High-speed roll coating with complex rheology fluids

The flow of high solids content suspensions and coating colors through the deformable gap of counter-rotating rolls at high speed was investigated. Measurements of nip pressure profiles in a laboratory film coater were conducted and flow visualization experiments downstream the nip were carried out....

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Bibliographic Details
Published inExperiments in fluids Vol. 40; no. 1; pp. 1 - 14
Main Authors ASCANIO, G, CARREAU, P. J, TANGUY, P. A
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 2006
Berlin
Subjects
Applied fluid mechanics
Coating
Droplets
Exact sciences and technology
Filaments
Fluid dynamics
Fluid flow
Fluids
Fundamental areas of phenomenology (including applications)
High speed
Hydrodynamics, hydraulics, hydrostatics
Instrumentation for fluid dynamics
Physics
Rheology
Shear viscosity
Test facilities
High speed
Pressure distribution
Flow visualization
Hydrodynamics
Experimental study
Elongational flow
Roller coating
Rheological properties
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Summary:The flow of high solids content suspensions and coating colors through the deformable gap of counter-rotating rolls at high speed was investigated. Measurements of nip pressure profiles in a laboratory film coater were conducted and flow visualization experiments downstream the nip were carried out. A high-speed video system allowed showing the formation, elongation and break up of filaments that yield the misting droplets. The role of rheology on misting was also investigated using shear and extensional data. Results show that misting, mainly generated by film splitting, is reduced when the extensional viscosity of the color is larger.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-005-0025-5