Refining gentleness – a key to bulky CTMP-Reference-Cited by-同舟云学术

Refining gentleness – a key to bulky CTMP

Published:2022-01-29 Issue:2 Volume:37 Page:349-355
ISSN:2000-0669
Container-title:Nordic Pulp & Paper Research Journal
language:en
Short-container-title:

Author:

Berg Jan-Erik¹,Persson Erik¹,Hellstadius Börje²,Edlund Henrik³,Granfeldt Thomas,Lundfors Mikael⁴,Engstrand Per¹

Affiliation:

1. Department of Chemical Engineering , Mid Sweden University, FSCN , Sundsvall , Sweden

2. BillerudKorsnäs AB , Gävle , Sweden

3. BillerudKorsnäs AB , Frövi , Sweden

4. Valmet AB, Refiner Segments , Vretenvägen 11 , Solna , Sweden

Abstract

Abstract Chemithermomechanical pulp (CTMP) is often used in middle layers of multiply paperboards due to its high bulk at specified strength. Such a CTMP should consist of well-separated undamaged fibres with sufficient bonding capacity. The basic objective of this work is to examine the effect of refining on bulk, taking into account conditions such as temperature, sulphonation, refining gap and refiner size. First stage CTMP made from Norway spruce (Picea abies) were produced in pilot and mill scale trials. Two new parameters, Equivalent temperature related to softness and Refining gentleness are introduced that take into account refining conditions as actual temperature, softening temperature, bound sulphonate content, refining gap and refiner diameter. The results show that bulk increases linearly with refining gentleness.

Funder

Knowledge Foundation

Publisher

Walter de Gruyter GmbH

Subject

General Materials Science,Forestry

Link

https://www.degruyter.com/document/doi/10.1515/npprj-2021-0060/pdf

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