Rheological additive and wax in packaging paint by Vis-NIR spectroscopy
Applications | 2019 | MetrohmInstrumentation
Packaging coatings are essential to protect, preserve, and enhance the appearance of food products. Rheological additives regulate viscosity and dispersion, while wax improves surface hardness and abrasion resistance. Strict regulatory standards for food-contact materials drive the need for rapid and reliable quality control.
This study aimed to establish a fast, accurate, and user-friendly Vis-NIR spectroscopy method to simultaneously quantify rheological additives and wax in packaging paints. A set of 40 paint samples with varying contents was analyzed to develop robust calibration models.
Both models demonstrated high linearity and low prediction errors, confirming the method’s suitability for quality monitoring. Wavelength selection effectively minimized spectral interferences.
The Vis-NIR spectroscopy method provides a powerful tool for fast, accurate quantification of rheological additives and wax in packaging paints, supporting regulatory compliance and process optimization.
NIR Spectroscopy
IndustriesEnergy & Chemicals
ManufacturerMetrohm
Summary
Importance of the Topic
Packaging coatings are essential to protect, preserve, and enhance the appearance of food products. Rheological additives regulate viscosity and dispersion, while wax improves surface hardness and abrasion resistance. Strict regulatory standards for food-contact materials drive the need for rapid and reliable quality control.
Objectives and Study Overview
This study aimed to establish a fast, accurate, and user-friendly Vis-NIR spectroscopy method to simultaneously quantify rheological additives and wax in packaging paints. A set of 40 paint samples with varying contents was analyzed to develop robust calibration models.
Methodology and Instrumentation
- Instrument: Metrohm XDS RapidLiquid Analyzer (Model 2.921.1410)
- Accessories: 2 mm quartz cuvette; 12.5 mm spacer
- Software: Vision Air 2.0 Complete
- Measurement: Transmission spectra at 30 °C, no sample pretreatment
- Chemometric approach: Partial Least Squares regression with wavelength selection
Main Results and Discussion
- Rheological Additive: Calibration range 10–40 %, R² = 0.99, SEC = 0.73 %, SECV = 0.78 %, 4 PLS factors
- Wax: Calibration range 1.0–5.2 %, R² = 0.99, SEC = 0.06 %, SECV = 0.07 %, 3 PLS factors
Both models demonstrated high linearity and low prediction errors, confirming the method’s suitability for quality monitoring. Wavelength selection effectively minimized spectral interferences.
Benefits and Practical Applications
- Rapid analysis (< 1 minute) with minimal sample handling
- Simultaneous multi-component determination
- Non-destructive measurements
- Suitable for routine process control in coating production
Future Trends and Potential Applications
- Integration into inline process analytical technology (PAT)
- Expansion to other coating additives and matrix types
- Advanced chemometric algorithms for improved robustness
- Combination with other spectroscopic techniques for multi-modal analysis
Conclusion
The Vis-NIR spectroscopy method provides a powerful tool for fast, accurate quantification of rheological additives and wax in packaging paints, supporting regulatory compliance and process optimization.
Reference
- Metrohm Application Note AN–NIR–072, Version 1 (April 2019)
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