Adjusting the die cutting process and tools for biopolymer dispersion coated paperboards

作者：Tanninen Panu^*; Saukkonen Esa; Leminen Ville; Lindell Henry; Backfolk Kaj

来源：Nordic Pulp & Paper Research Journal, 2015, 30(2): 335-342.

DOI：10.3183/npprj-2015-30-02-p335-342

• Biobarrier
• Press forming
• Die cutting
• Creasing
• Paperboard

The formability and convertibility of different biopolymer dispersion coated paperboards was studied by varying the creasing forces and creasing tools with various geometries. In all cases, the same baseboard was used whereas the dispersion barrier coating was changed. The selected samples were reel-to-reel dispersion coated with a blade coating unit using high solid dispersions containing high aspect ratio pigments, latex and modified starch, respectively. As a reference substrate, a polyethylene extrusion coated paperboard was used. The dispersion coated paperboard web was converted in the adjustable packaging line, manufacturing creased blanks that were then press formed into trays. In both intermediate stages, i.e. blanks and as ready formed trays, the samples were examined for pinholes by using dyeing techniques. Microscope imaging of resin-embedded cross-sections of the tray corners further clarified the effects of mechanical and physical stresses. The results of substrate convertibility, evaluated both from a material performance as well as a tooling point of view, indicated that the origin of pinholes in ready-made trays is primarily in the die-cutting process. The forces used in the die cutting must be reduced to preserve the integrity of the dispersion biopolymer coating layer.

• 出版日期2015