Comparison of the application of polysaccharide-based barrier coatings on paper using filmpress and spray coating

Description

In this study two different coating application methods of biopolymers onto two different paper substrates were investigated. The used biopolymers were 5wt% aqueous solutions of alginate and chitosan which were applied at different coat weights using both a laboratory film press as well as purpose-built laboratory spray coating unit. The biopolymer coated papers were evaluated regarding their basic barrier performance against air, water vapor and grease. The results show that the application amount with a film press is limited by the low solids content of the applied biopolymers thus necessitating double application in order to reach coat weights >3-4 g/m² and side necessary to achieve a sufficient improvement of barrier performance. Spray application is less limited regarding applied coat weights in single coating using low solids, high viscous biopolymers but in order to show improved barrier properties also coat weights >3-4 g/m² and side are required. Furthermore, single layer, spray coated biopolymer coatings show more defects compared to double layer filmpress coatings of biopolymers.

Period	28 Apr 2024
Event title	TAPPI 16th Advanced Coating Symposium
Event type	Conference
Location	Cleveland, United States, OhioShow on map
Degree of Recognition	International