Pilot Coating With a Hemicellulose-Based Barrier, 18PaperCon

A hemicellulose-based barrier formulation was produced from wood chips to pilot coating application in a blade coater. The development process is described from a project planning point of view with network plan and decision points.

Different hemicelluloses were produced and compared in the research laboratory. Oxygen barrier properties from films and rheology of water suspensions were evaluated for different laboratory produced hemicelluloses originating from wood chips or from kraft pulps. The viscosity at low and high shear rates were evaluated. From these results, hemicellulose produced from birch wood chips was chosen.

Hemicellulose was then produced at in kg quantities. The hemicellulose was produced employing pre-hydrolysis treatment of birch wood chips. The concentration of hemicellulose pre-hydrolyses was increased from 3.3% to 11.5% by membrane filtration. The barrier properties of the hemicellulose coated material were evaluated in laboratory scale. A pre-coating was also evaluated in laboratory scale.

Trials were performed at Iggesund PaperBoard in their pilot scale coater. A pre-coating was applied during the first day, and the hemicellulose-based coating was applied on the second day. The pilot trials went well without any larger obstacles. Quick barrier evaluations showed that the hemicellulose-based barrier coating had a good grease resistance even if the coating consumption during the trials indicated a low application grammage. 

TAPPI conference proceedings and presentations, technical papers, and publication articles provide technical and management data and solutions on topics covering the Pulp, Paper, Tissue, Corrugated Packaging, Flexible Packaging, Nanotechnology and Converting Industries.

Simply select the quantity, add to your cart and your conference paper, presentation or article will be available for immediate download.