Drying Behaviour

Film formation MS-DWS

The very first commercial instrument based on MS-DWS-technology, RHEOLASER COATING enables monitoring of microstructure changes during the film formation process. It identifies the drying mechanisms and characteristic drying times on any kind of substrate and any thickness. It works on any kind of film-forming products or coatings, such as inks, paints, varnishes, resins, binders, cosmetic films…


Measurement principle


Data and parameters

Fluidity Factor

Thanks to the unique and patented A.S.I.I (Adaptive Speckle Image Interferometry) processing, evolution of the “Fluidity Factor” versus time is displayed in real time providing a wide range of information such as:

  • Optical film formation analyser
  • Drying times (open time, touch-dry time, dry-hard time, …)
  • Curing times
  • Microstructure change (particle packing, particle deformation, curing…)

Trocknungsverhalten_Fluidity Factor_Abbildung 1

Characteristic times

Rheolaser COATING gives access to any characteristic time of the drying/curing process:

  • Open-time
  • Dust-free
  • Set-to-touch
  • Dry through

Trocknungsverhalten_Characteristic Times_Abbildung 2

A versatile device

RHEOLASER COATING has been designed as an open configuration to run experiments with automatic coater and/or vacuum bed. It works with any sample thickness, and on any kind of substrate: metal, glass, plastic, wood, concrete, paper, and records temperature and humidity all the time for a perfect traceability…

Abbildung 4

Main Advantages

  • Contact-free method
  • Microstructure analysis
  • Open environment: measurement on any kind of substrate, at any thickness

References and norms

/1/ A Brun, L Brunel and P Snabre, “Adaptive speckle imaging interferometry (ASII): New technology for advanced drying analysis of coatings”, Surface Coatings International Part B: Coatings Transactions Vol 89, B3, 193–268, September 2006



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