Near-Infrared (NIR) measurement in coatings
Near-Infrared Spectroscopy (NIR) can be used in coating production to measure various parameters. Here are some common parameters measured with NIR in coatings:
Drying time of coatings
NIR can be used to monitor the drying time of coatings by measuring changes in moisture content. This is important to ensure the efficiency of the drying process.
Moisture measurement with NIR is often used when you also want to measure other parameters with the same instrument.
Otherwise, we recommend a separate moisture measurement. A separate moisture measurement may also be advised in some other situations.
Photo: In-line moisture measurement with microwave technology from TEWS is widely used by paint manufacturers
Here you can find more information on online moisture and density analyzers.Composition of coatings
NIR can be used to analyze the chemical composition of coatings. It can provide information about the concentrations of various components, such as resins, solvents, pigments and additives.
Thickness of the coating
By measuring the absorption of NIR light, information can be obtained about the thickness of the applied coating. This is important to ensure coating uniformity.
Solvent content of coatings
NIR can be used to measure solvent content in coatings. This is relevant for both quality control and environmental considerations, as it can indicate the extent of solvent evaporation during the drying process.
Hardness and curing
NIR can be applied to monitor the degree of curing. This allows the manufacturer to evaluate the quality of the coating and its performance.
Viscosity of coatings
NIR can provide indirect information about the viscosity of coatings through correlations with chemical composition and other properties. As with adhesives, direct viscosity measurements may be more accurate with specialized viscometers.
Photo: viscosity solution using the resonance frequency technique
More information on an inline viscosity measurement by resonance frequency. Especially interesting for High Viscosity products.Quality of the raw materials for use in coatings
NIR can be used to check the quality of raw materials in coatings. This allows the producer to identify impurities or variations in the composition.
Molecular structure of coatings
NIR can provide information about the molecular structure of polymers and other components in coatings. This insight can be useful in understanding the properties and performance of the coating.
Finally on the use of NIR in the production of coatings:
The use of NIR in coatings offers advantages such as rapid analysis, non-destructive measurements and real-time process control capabilities. As with other applications, it is important to tailor the NIR system to the specific needs of the production environment and to develop calibration curves for accurate measurements.
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Near-Infrared (NIR) measurement in coatings
Inventech is the specialist in Near Infrared spectrocopy in coatings.