Meaning
Multilayered paperboard materials provide the structural integrity required for consumer packaging in the food and pharmaceutical industries. Producers use folding boxboard because it combines a smooth printing surface with the stiffness needed to protect the contents. The material typically consists of mechanical pulp sandwiched between layers of chemical pulp.
This construction allows the board to be creased and folded without cracking the outer surface.
Structural Material
High stiffness is achieved through the use of bulky mechanical fibers in the center of the board. The composition of folding boxboard ensures that the package maintains its shape during shipping and when stacked on a retail shelf. Different weights are available to suit the requirements of various product sizes.
Chemical pulp on the outer layers provides the strength needed for a clean fold.
Layer Composition
Bleached chemical fibers create the white surface that is necessary for high quality graphics. When manufacturing folding boxboard, the bonding between the layers must be strong enough to prevent delamination. Coatings are often added to the top layer to enhance the gloss and the ink holdout.
The total thickness is carefully controlled to ensure that the board works in high speed automated packing machines. Recycled fibers are sometimes used in the middle layers to reduce the environmental footprint of the packaging. Moisture content must be strictly managed to prevent the board from curling during the printing process.
Printing Application
Smooth surfaces allow for the reproduction of fine details and vibrant colors. Because folding boxboard is highly receptive to inks, it is a preferred choice for luxury goods.
