Fines-enriched pulp as a strength agent in a CTMP middle ply, 18PaperCon



The objective of this pilot scale trial, was to evaluate fines-enriched pulp (FE-pulp) as a strength agent in a middle ply of a board product. A typical CTMP-based middle ply was produced on the FEX pilot paper machine. The stock consisted of CTMP, refined hardwood and softwood pulp, and filler. FE-pulp as strength agent was compared with glue pulp, a highly refined chemical pulp. FEX sheets and hand sheets made of pulp mixtures were evaluated. Also, the dewatering and pressing conditions on the paper machine were compared.  The results confirmed the results of earlier experiments with handsheets; FE-pulp used as strength agent showed to be twice as efficient as glue pulp regarding strength properties without impairing the bulk. Further, the dewatering conditions and press dryness’s on the paper machine was comparable at these additions. Thus, all these results imply that addition of FE-pulp can replace the double amount of glue pulp as a strength agent. 

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Author: Elisabeth Björk, Mikael Bouveng, and Hannes Vomhoff
Fines-enriched pulp as a strength agent in a CTMP middle ply
Fines-enriched pulp as a strength agent in a CTMP middle ply, 18PaperCon
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