Primary Fines and their Positive Influence on Energy Consumption during Refining with Regard to Strength Development for Softwood Kraft Pulp

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

Abstract

Besides the fiber fraction the so called fines fraction affects both production process and product properties and has
received increasing interest in recent years and several research groups have experimented with either primary and/or
secondary fines to assess their corresponding properties with not always consistent results.
Our work focuses on the primary fines fraction of an unbleached softwood kraft pulp. Primary fines are separated
from the pulp using a laboratory pressure screen to be added again in controlled amounts afterwards. Thereby three
pulp blends, showing a primary fines content of around 5%, 9% and 12% where prepared. These pulp blends were
refined in a PFI mill at 1000, 4500 and 6000 revolutions.
The results show that the primary fines enhance tensile strength in the unrefined and slightly refined state while they
do not increase the maximum tensile strength of the highly refined reference. The results also show a slightly increased
dewatering resistance (Schopper-Riegler) but comparable air permeability (Gurley) for a given tensile strength. The
linear relationship between tensile index and apparent sheet density seems to be affected in the unrefined and slightly
refined state where the breaking length of the fines-enriched samples is higher for a given apparent density.
Originalspracheenglisch
TitelInternational Paper Physics Conference
ErscheinungsortIndianapolis
Herausgeber (Verlag)Tappi Press
KapitelRole of Fines and Nanocellulose in Paper
Seiten241-246
Seitenumfang6
PublikationsstatusVeröffentlicht - Mai 2019
Veranstaltung2019 International Paper Physics Conference at PaperCon - Indianapolis, USA / Vereinigte Staaten
Dauer: 5 Mai 20198 Mai 2019

Konferenz

Konferenz2019 International Paper Physics Conference at PaperCon
LandUSA / Vereinigte Staaten
OrtIndianapolis
Zeitraum5/05/198/05/19

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Kraft pulp
Softwoods
Refining
Tensile strength
Energy utilization
Pulp
Air permeability
Fibers

Schlagwörter

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    Primary Fines and their Positive Influence on Energy Consumption during Refining with Regard to Strength Development for Softwood Kraft Pulp. / Mandlez, Daniel; Zangl-Jagiello, Lukas; Eckhart, Rene; Bauer, Wolfgang.

    International Paper Physics Conference. Indianapolis : Tappi Press, 2019. S. 241-246.

    Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

    Mandlez, D, Zangl-Jagiello, L, Eckhart, R & Bauer, W 2019, Primary Fines and their Positive Influence on Energy Consumption during Refining with Regard to Strength Development for Softwood Kraft Pulp. in International Paper Physics Conference. Tappi Press, Indianapolis, S. 241-246, Indianapolis, USA / Vereinigte Staaten, 5/05/19.
    @inproceedings{2dacd00c3d0a4c25aa6ea3f7c6847f91,
    title = "Primary Fines and their Positive Influence on Energy Consumption during Refining with Regard to Strength Development for Softwood Kraft Pulp",
    abstract = "Besides the fiber fraction the so called fines fraction affects both production process and product properties and hasreceived increasing interest in recent years and several research groups have experimented with either primary and/orsecondary fines to assess their corresponding properties with not always consistent results.Our work focuses on the primary fines fraction of an unbleached softwood kraft pulp. Primary fines are separatedfrom the pulp using a laboratory pressure screen to be added again in controlled amounts afterwards. Thereby threepulp blends, showing a primary fines content of around 5{\%}, 9{\%} and 12{\%} where prepared. These pulp blends wererefined in a PFI mill at 1000, 4500 and 6000 revolutions.The results show that the primary fines enhance tensile strength in the unrefined and slightly refined state while theydo not increase the maximum tensile strength of the highly refined reference. The results also show a slightly increaseddewatering resistance (Schopper-Riegler) but comparable air permeability (Gurley) for a given tensile strength. Thelinear relationship between tensile index and apparent sheet density seems to be affected in the unrefined and slightlyrefined state where the breaking length of the fines-enriched samples is higher for a given apparent density.",
    keywords = "Kraft Pulp, Primary fines, Beating, Refining",
    author = "Daniel Mandlez and Lukas Zangl-Jagiello and Rene Eckhart and Wolfgang Bauer",
    year = "2019",
    month = "5",
    language = "English",
    pages = "241--246",
    booktitle = "International Paper Physics Conference",
    publisher = "Tappi Press",

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    TY - GEN

    T1 - Primary Fines and their Positive Influence on Energy Consumption during Refining with Regard to Strength Development for Softwood Kraft Pulp

    AU - Mandlez, Daniel

    AU - Zangl-Jagiello, Lukas

    AU - Eckhart, Rene

    AU - Bauer, Wolfgang

    PY - 2019/5

    Y1 - 2019/5

    N2 - Besides the fiber fraction the so called fines fraction affects both production process and product properties and hasreceived increasing interest in recent years and several research groups have experimented with either primary and/orsecondary fines to assess their corresponding properties with not always consistent results.Our work focuses on the primary fines fraction of an unbleached softwood kraft pulp. Primary fines are separatedfrom the pulp using a laboratory pressure screen to be added again in controlled amounts afterwards. Thereby threepulp blends, showing a primary fines content of around 5%, 9% and 12% where prepared. These pulp blends wererefined in a PFI mill at 1000, 4500 and 6000 revolutions.The results show that the primary fines enhance tensile strength in the unrefined and slightly refined state while theydo not increase the maximum tensile strength of the highly refined reference. The results also show a slightly increaseddewatering resistance (Schopper-Riegler) but comparable air permeability (Gurley) for a given tensile strength. Thelinear relationship between tensile index and apparent sheet density seems to be affected in the unrefined and slightlyrefined state where the breaking length of the fines-enriched samples is higher for a given apparent density.

    AB - Besides the fiber fraction the so called fines fraction affects both production process and product properties and hasreceived increasing interest in recent years and several research groups have experimented with either primary and/orsecondary fines to assess their corresponding properties with not always consistent results.Our work focuses on the primary fines fraction of an unbleached softwood kraft pulp. Primary fines are separatedfrom the pulp using a laboratory pressure screen to be added again in controlled amounts afterwards. Thereby threepulp blends, showing a primary fines content of around 5%, 9% and 12% where prepared. These pulp blends wererefined in a PFI mill at 1000, 4500 and 6000 revolutions.The results show that the primary fines enhance tensile strength in the unrefined and slightly refined state while theydo not increase the maximum tensile strength of the highly refined reference. The results also show a slightly increaseddewatering resistance (Schopper-Riegler) but comparable air permeability (Gurley) for a given tensile strength. Thelinear relationship between tensile index and apparent sheet density seems to be affected in the unrefined and slightlyrefined state where the breaking length of the fines-enriched samples is higher for a given apparent density.

    KW - Kraft Pulp

    KW - Primary fines

    KW - Beating

    KW - Refining

    M3 - Conference contribution

    SP - 241

    EP - 246

    BT - International Paper Physics Conference

    PB - Tappi Press

    CY - Indianapolis

    ER -