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Coating analysis

OPTICAL CHARACTERIZATION OF COATINGS

The very first commercial instrument based on MS-DWS technology, RheolaserCOATING, 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...

Key benefits

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

Multi-Speckle Diffusing Wave Spectroscopy

The measurement is based on an optical technology, Diffusing Wave Spectroscopy (DWS). A laser illuminates the coating and  laser photons travel through the coating thickness to interact with the coating's scatterers (particles, droplets, polymers…). The different optical paths of the photons induce interfered backscattered waves forming an image on the camera composed of bright and dark spots and called speckle image.

When the coating presents important microscopic dynamics activity (liquid-like), the speckle image will be fluctuating, some bright spots become dark and some dark spots become bright. The fluctuation speed is directly correlated to scatterers' motion and thus to the visco-elastic properties of the material.

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Data and key features

  • Rheolaser Coating - Coating drying analysis
  • Rheolaser Coating - Coating drying analysis

> Fluidity Factor

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

  • Optical film formation analysis
  • Drying times (open time, touch-dry time, dry-hard time, ...)
  • Curing times
  • Microstructure change (particle packing, particle deformation, curing...)
Rheolaser Coating - drying characteristic times

> Characteristic times

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

  • Open-time
  • Dust-free
  • Set-to-touch
  • Dry through
  • Coating drying analysis
  • Coating drying analysis
  • Coating drying analysis

> 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, records temperature and humidity at all times and works on any kind of substrate: metal, glass, plastic, wood, concrete, paper, and others... 

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