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Bio-based alternatives for heat sealing flexible packaging
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School of Chemical Engineering |
Master's thesis
Electronic archive copy is available via Aalto Thesis Database.
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en
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69
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Abstract
This study investigates the potential of bio-polymeric water-based dispersion coatings for heat sealing paper based flexible packaging. Two reference coatings and four bio-based dispersions were used for comparison out of which one cellulose acetate butyrate water-based dispersion was prepared at the lab scale. Wet-laid and foam-formed substrates were used for these heat-sealing coatings. The coatings were heat sealed under controlled conditions at two different temperature levels (130 °C and 160 °C) and force levels (300 N and 600 N). The objective was to evaluate whether bio-based heat sealants can serve as sustainable alternatives to fossil-based coatings by assessing their seal strength, and thermal stability. The results demonstrated that while the fossil-based reference coating outperformed the other coatings at all conditions, selected bio-based dispersions showed competitive performance, especially at higher temperatures and pressures. However, certain coatings exhibited reduced performance under higher conditions. Overall, the findings support the potential of bio-based dispersion coatings in heat-sealable packaging, provided that formulations are optimized for processing parameters and end-use requirements.
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Supervisor
Kontturi, EeroThesis advisor
Mayer, FlorianHenrikksson, Emmi