FiberLean® MFC products are tailored for several packaging applications. In Folding Box Board, FiberLean® MFC applied in the middle layer increases the bonding strength allowing for bulkier – less refined – fibers to be used to further separate the outer layers increasing the stiffness of the board at any given basis weight. For the outer layers of White Top Linerboard and Cartonboard, FiberLean® MFC increases the opacity and strength of the top layer, whilst reducing porosity allowing for better coverage and basis weight reduction.
In this application FiberLean® MFC has low level of mineral, typically 50% of the product by weight is MFC. The resulting minor addition of filler does not affect the capability of the production of a bulkier and stiffer board and improves the dewatering on the board machine.
The addition of FiberLean® MFC to the middle layer improves internal bond strength.
This allows the use of lower-cost coarser/bulkier fibers, which provide a net overall improvement in Bulk and Stiffness.
By converting a small portion of the pulp to MFC it is possible to make paper with the same strength, opacity and brightness with 35% less fiber. This allows the board producer to increase the fibers in the middle layer and make a stronger board, or reduce the overall weight of the board.
FiberLean® MFC is added to outer layers to increase filler content whilst maintaining strength.
The increased filler content improves optical coverage of the middle/base layers, enabling the basis weight to be reduced with maintained board
The middle/base layer basis weight can be increased proportionately to improve mechanical properties.
The overall result is lower fiber costs with maintained /improved board properties.
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