Abstract

The HCl method was used to compare pine and spruce TMP pulps. Delignification gave much stronger fibre cleavage by HCl (3.5-5x for Stage 3) indicating that lignin and hemicelluloses protect the fibres from acid attack. Cleavage per fibre for TMP was similar as kraft pulps, while spruce TMP was more sensitive to HCl than pine TMP. A more robust secondary wall and a lower number of dislocations and weak points may be related to the higher refining energy needed for pine TMP pulps

Keywords

Thermomecahnical pulp; Scots pine; Norway spruce; HCL method; refining; dislocations

Published in

SPCI meddelande / The Swedish Association of Pulp and Paper Engineers
2009, pages: 322-324
Book title: Proceedings of International Mecahnical Pulping Conference, Södra Berget, Sundsvall
Publisher: SPCI, The Swedish Association of Pulp and Paper Engineers

Conference

Proceedings of International Mechanical Pulping Conference, Södra Berget, Sundsvall

Authors' information