Mid Sweden University

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Niskanen, Kaarlo
Publikasjoner (7 av 7) Visa alla publikasjoner
Niskanen, K., Berg, J.-E., Liubytska, K. & Sandberg, C. (2025). Fragmentation of fibrous particles in LC refining. Cellulose, 32(8), 4705-4723
Åpne denne publikasjonen i ny fane eller vindu >>Fragmentation of fibrous particles in LC refining
2025 (engelsk)Inngår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 32, nr 8, s. 4705-4723Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Low-consistency (LC) refining is used in mechanical pulping and in general to give a final touch to a papermaking pulp. The desired—and undesired—effects come from changes in the property and size distributions of the different kinds of fibrous particles. In our study, we focus on the changes in the size distributions of mechanical pulps, measured with an optical fibre analyser. Pulp samples were collected before and after industrial LC refiners of thermomechanical pulps with spruce as raw material. We demonstrate that changes in the observed size distributions of fibre length and diameter can be reproduced with a stochastic model with just two parameters for particles breaking uniformly at random locations. One probability controls the breaks per unit length that shorten fibres, and another the splits per unit diameter that generate more fines. Our findings support the hypothesis that these two processes are separate so that breaks in length do not govern the increase in fines. Both fibre shortening and fines generation increased with refining energy but, at a given energy, only fibre shortening showed clear differences between trials. In a two-stage refining trial, the probability that fibres shorten was equal to the product of the single-stage probabilities. In addition, the two-stage probability fell on the same straight line as the one-stage probabilities when both were plotted against the refining energy measured from the threshold energy at which breaks start. 

sted, utgiver, år, opplag, sider
Springer, 2025
Emneord
Fibres, Fragmentation, Low-consistency, Model, Refining
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-54511 (URN)10.1007/s10570-025-06558-z (DOI)001489525200001 ()2-s2.0-105005121980 (Scopus ID)
Tilgjengelig fra: 2025-05-27 Laget: 2025-05-27 Sist oppdatert: 2025-09-25
Bäckström, I., Fredman, P., Giritli Nygren, K., Niskanen, K., Olofsson, A., Nilsson, H.-E. & Lindbäck, K. (Eds.). (2024). Globala utmaningar – lokala lösningar: Forskning för en hållbar samhällsutveckling i norra Sverige. Sundsvall: Mid Sweden University
Åpne denne publikasjonen i ny fane eller vindu >>Globala utmaningar – lokala lösningar: Forskning för en hållbar samhällsutveckling i norra Sverige
Vise andre…
2024 (svensk)Collection/Antologi (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Sundsvall: Mid Sweden University, 2024. s. 202
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-51988 (URN)978-91-89786-75-2 (ISBN)
Tilgjengelig fra: 2024-07-23 Laget: 2024-07-23 Sist oppdatert: 2025-09-25bibliografisk kontrollert
Östlund, S. & Niskanen, K. (Eds.). (2021). Mechanics of Paper Products: 2nd, expanded edition. Berlin: Walter de Gruyter
Åpne denne publikasjonen i ny fane eller vindu >>Mechanics of Paper Products: 2nd, expanded edition
2021 (engelsk)Collection/Antologi (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Berlin: Walter de Gruyter, 2021. s. 315
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-40900 (URN)10.1515/9783110619386 (DOI)2-s2.0-85111909578 (Scopus ID)978-3-11-061741-2 (ISBN)
Tilgjengelig fra: 2021-01-21 Laget: 2021-01-21 Sist oppdatert: 2025-09-25bibliografisk kontrollert
Gustafsson, P.- . J. & Niskanen, K. (2021). Paper as an engineering material. In: Mechanics of Paper Products: (pp. 5-28). Walter de Gruyter
Åpne denne publikasjonen i ny fane eller vindu >>Paper as an engineering material
2021 (engelsk)Inngår i: Mechanics of Paper Products, Walter de Gruyter, 2021, s. 5-28Kapittel i bok, del av antologi (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Walter de Gruyter, 2021
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-46647 (URN)10.1515/9783110619386-002 (DOI)2-s2.0-85143183584 (Scopus ID)9783110619386 (ISBN)9783110619508 (ISBN)
Tilgjengelig fra: 2022-12-13 Laget: 2022-12-13 Sist oppdatert: 2025-09-25bibliografisk kontrollert
Niskanen, K. & Östlund, S. (2021). The challenge. In: Mechanics of Paper Products: (pp. 1-3). Walter de Gruyter
Åpne denne publikasjonen i ny fane eller vindu >>The challenge
2021 (engelsk)Inngår i: Mechanics of Paper Products, Walter de Gruyter, 2021, s. 1-3Kapittel i bok, del av antologi (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Walter de Gruyter, 2021
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-46648 (URN)10.1515/9783110619386-001 (DOI)2-s2.0-85143182617 (Scopus ID)9783110619386 (ISBN)9783110619508 (ISBN)
Tilgjengelig fra: 2022-12-13 Laget: 2022-12-13 Sist oppdatert: 2025-09-25bibliografisk kontrollert
Niskanen, K. (2014). Lagra kol i form av trämaterial.
Åpne denne publikasjonen i ny fane eller vindu >>Lagra kol i form av trämaterial
2014 (svensk)Annet (Annet (populærvitenskap, debatt, mm))
Publisher
s. 3
Serie
Reflektion & Dialog ; Nr 6 (2014)
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-26383 (URN)
Merknad

Källa: ”Reflektion & Dialog”, Kent Johansson, Centerpartiet

Tilgjengelig fra: 2015-12-08 Laget: 2015-12-08 Sist oppdatert: 2025-09-25bibliografisk kontrollert
Niskanen, K. (Ed.). (2012). Mechanics of paper products. Berlin: Walter de Gruyter
Åpne denne publikasjonen i ny fane eller vindu >>Mechanics of paper products
2012 (engelsk)Collection/Antologi (Annet vitenskapelig)
Abstract [en]

This graduate level textbook focuses on the mechanical properties and performance of products made of fiber-based materials such as paper and board. The book aims to help students develop effective skills for solving problems of product performance and engineering challenges in new product development. Therefore the material is organized with a problem-based approach - a practical example of product performance is presented and then the relevant mechanics are analyzed to deduce which material properties control the performance.

sted, utgiver, år, opplag, sider
Berlin: Walter de Gruyter, 2012. s. 271
Emneord
Paper-Mechanical properties, Paper products
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-17985 (URN)978-3-11-025461-7 (ISBN)978-3-11-025463-1 (ISBN)
Tilgjengelig fra: 2012-12-19 Laget: 2012-12-19 Sist oppdatert: 2025-09-25bibliografisk kontrollert
Organisasjoner