Abstract
In paper and board industry there is a strong need for a radically more resource-efficient production technologies, which would also enable the manufacture of sustainable and value- added fibre products. In this paper we introduce foam forming method, where foam is used as a transporting media of furnishes. The technology enables to make structures with excellent formation in higher headbox consistencies and a very high bulk. When this is combined with the good water drainage properties, which allows the high addition levels of strengthening agents as micro fibrillar cellulose (MFC), one can make products with very big bulk and still have an adequate strength value. We studied different MFC grades and they seem to behave rather similarly in bulk vs. strength comparisons. However, some difference is obtained leaving room for optimization of best MFC grade on certain product.
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