"ProUmid provides state of the art, high quality products for sorption measurements as well as precisely controlled relative humidity in analytical instruments and technical equipment."
Packaging Materials and Polymer Films
Packaging materials and polymer films are intended to provide a barrier against adverse climatic conditions to prevent the loss or adsorption of moisture by the packaged product. The decisive criterion here is the water vapor permeability. In addition, moisture adsorption by the packaging material itself plays an important role in ensuring its functionality. For that reason, knowledge of water vapor sorption and permeability is essential to adapt a packaging material to the respective requirements.
With the help of dynamic water vapor sorption analyses and the specially developed ProUmid Permeability Kit and the Large Object Kit these characteristics can be determined easily.
Water vapor permeability of films
The Application note presents a method for the determination of the water vapor permeability using dynamic water vapor sorption measurements. Principle of the method, set up of the experiment as well as evaluation of the results is shown using the example of wrapping films and aluminum foil. Furthermore, the influence of the ambient humidity on water vapor transition rate is shown.
Water vapor sorption of product packages
The water vapor sorption behavior of several candy packages was analyzes using the Large Object Kit. Results show the influence of the packaging material on the moisture sorption behavior. Furthermore, the effect of an additional foil wrapping on moisture sorption is shown.
Literature references for packaging material applications with the ProUmid DVS instruments
Sandra Kiese, et al. “Time-dependent water vapor permeation through multilayer barrier films: Empirical versus theoretical results” Thin Solid Films 672, 199-205, 2019. DOI
Martina Lindner, et al. “Hygroexpansion, Surface Roughness and Porosity Affect the Electrical Resistance of EVOH-Aluminum- Coated Paper” Coatings 9, 295, 2019. DOI
Markus Schmid, et al. “Impact of Hydrolyzed Whey Protein on the Molecular Interactions and Cross-Linking Density in Whey Protein Isolate-Based Films” International Journal of Polymer Science, 2016. DOI