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Successive twin-wire roll forming of two-ply paper with softwood kraft pulp and recycled pulp - Effect of kraftply formation on Z-strength
SCA, Sweden.
RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
2017 (Engelska)Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, nr 4, s. 639-645Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Kraftliner and kraft-top liner typically consists of two or more plies that are formed separately and combined by couching. The Z-strength tends to be limited by the ply adhesion, and the softwood kraft pulp used is commonly refined beyond the optimum for tensile strength to ensure sufficient Z-strength. In this work, two-ply forming by successive twin-wire roll forming, was evaluated with moderately refined never-dried unbleached softwood kraft pulp and recycled pulp in different plies. Successive twin-wire roll forming involved two-sided roll forming of the first ply and onesided roll forming of the second ply directly onto the first ply. Two-sided roll forming of the recycled pulp and onesided roll forming of the kraft pulp was evaluated in parallel to the reversed combination. The Z-strength was found to be limited by the strength of the kraft ply rather than by the ply adhesion. The effect on Z-strength when changing headbox consistency or when going from one-sided to two-sided roll forming for the kraft ply was in agreement with results for single-ply forming. Besides the favorable findings for Z-strength, the results suggest that successive roll forming enables an efficient utilization of the tensile strength potential of the softwood kraft pulp. 

Ort, förlag, år, upplaga, sidor
De Gruyter Open Ltd , 2017. Vol. 32, nr 4, s. 639-645
Nyckelord [en]
Formation, Forming sections, Kraft pulps, Liner boards, Multiply boards, Reclaimed fibers, Tensile strength, Z direction strength, Adhesion, Pulp refining, Recycling, Softwoods, Unbleached pulp, Wire, Forming section, Z-directions, Kraft pulp
Nationell ämneskategori
Materialteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-38040DOI: 10.3183/NPPRJ-2017-32-04-p639-646Scopus ID: 2-s2.0-85052674686OAI: oai:DiVA.org:ri-38040DiVA, id: diva2:1297184
Tillgänglig från: 2019-03-19 Skapad: 2019-03-19 Senast uppdaterad: 2019-03-20Bibliografiskt granskad

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