首页期刊导航|Nordic pulp & paper research journal
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Nordic pulp & paper research journal
[Arbor Publishing AB]
Nordic pulp & paper research journal

[Arbor Publishing AB]

季刊

0283-2631

Nordic pulp & paper research journal/Journal Nordic pulp & paper research journalSCIISTP
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    The effect of xylanase on the fine structure of a bleached kraft softwood pulp

    Song, FeifeiGuo, WenwenQu, YuDing, Dayong...
    261-274页
    查看更多>>摘要：In this paper, X1 and X2 (two different xylanases), were employed to pretreat oxygen-delignified kraft softwood pulp. X2 could handle unwashed pulp, while X1 needed washed pulp. Subsequently, the effects of two xylanases on the physical properties, microstructure and fiber characteristics of pulp were investigated. Compared to the ECF bleached pulp (OD0EpD1), the brightness (86.9 %ISO), tensile index (28.4 N<middle dot>m/g) and burst index (1.67 kPa<middle dot>m2/g) of the ECF bleached pulp treated with X2 xylanase (9 U/g) increased by 2.4 %ISO, 4.8 % and 24.6 %. After X2 xylanase pretreatment, the fiber length of pulp decreased slightly, the content of fine fibers increased, and the water retention value increased. Due to the pretreatment of X2 xylanase, some non-fibrous components and chromophores in the pulp were removed, and the intrinsic viscosity and average molecular weight of the pulp were reduced. The crystallinity of cellulose decreases by 1 %, the fiber surface becomes rough, and voids are created, the specific surface area increases, and the average pore size increases. These findings suggest that enzyme pretreatment is a green and highly effective approach that not only significantly enhances pulping performance but also demonstrates excellent adaptability to complex processing environments and it streamlines the traditional pulping process effectively.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Development of handsheet mechanical properties linked to fibre distributions in two-stage low consistency refining of high yield pulp

    Sandberg, ChristerLindstrom, Stefan B.Liubytska, KaterynaNilsson, Fritjof...
    275-285页
    查看更多>>摘要：In this study, a two-stage, low-consistency (LC) refining process at the Holmen Braviken paper mill in Sweden was examined to evaluate the relationship between energy input, fibre distributions, and pulp properties, including handsheet properties. The LC refiners used thermo-mechanical pulp based on 100 % Norway spruce, with two specific energy levels: "low" (approximate to 80 kWh/adt) or "high" (approximate to 100 kWh/adt). All four permutations of these settings were examined. Overall, higher refining efficiency (measured by the increase in tensile index per applied energy) was observed in the first LC refiner stage than in the second. To further explore the impact of LC refining, pulp particle distributions were investigated. Samples from before, between and after the two LC stages were analysed using an optical fibre analyser, which provided detailed data on length-width-curl-fibrillation distributions. The impact of LC refining on these distributions was quantified using Kolmogorov-Smirnov statistics, highlighting statistically significant changes observed in the length and curl distributions. We investigated the correlation between energy input into the LC refiners and the impact on fibre distributions and handsheet properties. These insights underscore the effectiveness of our analytical approach and its potential for refining process control in mechanical pulping, offering a method for more targeted and efficient adjustments.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Analysis of finger ridges in paper manufacturing and development of a qualitative model of their formation

    Roosen, GerritArndt, TiemoMiletzky, Frank
    287-315页
    查看更多>>摘要：This study investigates the formation of finger ridges during the paper manufacturing process, highlighting the role of structural inhomogeneities and winding conditions. Finger ridges, characterised by multiple waves oriented in machine direction, result from local grammage and moisture variations, causing troughs during winding at the pope reeler. Key contributing factors include high paper density, low air permeability, low surface roughness, and high modulus of elasticity in the z-direction. Finger ridges appear only when a pigment coating and calendering process are involved, with the calendering significantly enhancing the properties that make the paper more prone to this defect. The developed qualitative model outlines three phases of formation: Phase 1 describes the initial formation of a trough during winding due to structural inhomogeneities; Phase 2 involves the appearance of the first finger ridge in the trough due to entrapped air, moisture equalization and winding conditions; Phase 3 describes the formation of additional finger ridges symmetrically around the initial finger ridge. The preventive measures developed include ensuring uniform cross-profiles, reducing air entrainment during winding, optimizing the calendering process, and utilizing larger reel spool cores and rubberised carrying drums. Implementing these strategies can significantly reduce finger ridges, enhancing paper planarity and quality.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Microfibrillated cellulose coatings for biodegradable electronics

    Guyer, KaylaMachold, MichaelTang, XiaoyanBechle, Nathan J....
    317-331页
    查看更多>>摘要：There is an increasing need for inexpensive biodegradable sensors that can be easily employed in networks such as the Internet of Things. Paper materials are renewable, biodegradable, and sustainable, and thus could be used as substrates for electronic sensors. This work examined two commodity cellulose materials, an envelope paper and a linerboard, as potential substrates. A multistage coating process was developed to create a smooth surface for screen-printing of sensors using inexpensive microfibrillated cellulose. Employing this process, approximately 10 g m-2 of microfibrillated cellulose was deposited, enhancing the mechanical performance of the coated materials compared with their uncoated counterparts. Sensors printed on the microfibrillated cellulose-coated substrates had reasonable electronic performance compared with those printed on a polymer substrate. Results indicate that further reducing surface roughness would be helpful for sensor performance.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Preparation of CMC-β-CD-sulfaguanidine and its application for protection of paper

    Gao, JunChen, XiaoshuangLi, HuaYan, Jiaxin...
    333-344页
    查看更多>>摘要：CMC-beta-CD-sulfaguanidine was synthesized by saturated aqueous solution method with beta-CD as carrier and sulfaguanidine as inclusion compounds based on the preparation of CMC-beta-CD, through single factor and orthogonal experiment, suitable conditions for the synthesis of CMC-beta-CD-sulfaguanidine was obtained. The structure of the synthesized CMC-beta-CD-sulfaguanidine was characterized by infrared spectroscopy, UV spectroscopy and SEM. The inclusion compounds was applied to paper reinforcement. By testing the effects of different mass concentrations of sulfaguanidine solution on the tensile strength, tearing strength, folding times, whiteness, glossiness and antibacterial properties of the paper, the suitable conditions for coating paper were found. The results show that when inclusion concentration of 3 mg/mL is coated on the paper, its mechanical properties are improved, the glossiness is slightly increased, and the whiteness is basically unchanged, at the same time, the paper has certain antibacterial properties. CMC-beta-CD-SG studied in this paper has the functions of strengthening, slow-releasing, anti-mildew and antibacterial for paper, which is an innovation of paper protection material, provides the theoretical basis and data reference, as well as a new research idea and technical approach for the development of products for paper protection.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Drying characteristics and numerical simulation of tissue paper

    Yan, YanWang, WeiChaoPan, ZhaoYang, Zhen...
    345-356页
    查看更多>>摘要：This study aims to investigate the drying process of tissue paper in depth and to analyze it comprehensively by combining experimental and simulation methods. In the experimental part, a variety of drying conditions were designed, including different air temperatures, air velocities, and bottom heating temperatures, to accurately measure the change in moisture ratio of tissue paper. Meanwhile, a mathematical model for predicting the tissue drying moisture ratio was constructed based on the experimental data, and the tissue drying process was simulated. The simulation presented the process of moisture transfer within the tissue paper visually and quantitatively. The experimental and simulation results validate and complement each other, revealing the synergistic influence mechanism of drying parameters on the drying effect of tissue paper. The results showed that the effects of air temperature, bottom heating temperature, and air velocity on the drying rate of tissue paper were in the following order: bottom heating temperature > air temperature > air velocity, and among eight drying kinetic models, the Aghbashlo model was the most suitable for describing the drying characteristics of tissue paper in thin layers, and the accuracy of the prediction model was verified by simulation.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Hemicellulose as an additive in papermaking

    Rahman, M. MostafizurFerdous, TaslimaJin, YangcanJahan, M. Sarwar...
    357-364页
    查看更多>>摘要：Hemicellulose, a lignocellulosic component derived from wood or non-wood pulping, has garnered emerging research interest due to its unique property profiles, which enable its potential use as a bio-based alternative additive in paper production. Additionally, it holds significant promise for commercialization within the forest biorefinery sector. The paper reviews the articles investigated on hemicellulose and cationic hemicellulose addition in papermaking. Studies have shown that hemicellulose removal from the pulp decreased tensile strength, and hemicellulose addition reduced refining energy and improved strength properties. The effectiveness of hemicellulose addition in pulp is influenced by the molar mass of xylan. The primary challenge in using hemicellulose as a wet-end chemical is its limited ability to significantly improve papermaking properties. Therefore, it needs to be cationized to get desired performance. The cationization agents are 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) and 2,3-epoxypropyl trimethyl ammonium chloride (EPTAC), which are used in alkaline medium. To reduce the degradation of hemicellulose, the cationization was also carried out in aqueous ethanol and relatively low alkali concentration. The application of cationic xylans to the anionic pulp surface mitigates the electrostatic repulsion, facilitate stronger inter-fiber bonding and improve papermaking properties.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Synthesis of carboxymethyl cellulose-β∼cyclodextrin-coated sulfaguanidine and its enhanced antimicrobial efficacy for paper protection

    Li, YuxuanLi, HuaChen, Xiaoshuang
    365-373页
    查看更多>>摘要：To enhance the strength and antimicrobial properties of paper cultural relics, and prolong the life of paper cultural relics, it is an urgent need to prepare new material for preservation and protection of paper. In this paper, CMC-beta-CD-SG was synthesized with beta-CD as carrier and sulfaguanidine as inclusion complex, the suitable conditions for the synthesis of CMC-beta-CD-sulfaguanidine was obtained. By testing the effects of different mass concentrations of sulfaguanidine solution on the tensile strength, tearing degree, folding times, whiteness, gloss and antimicrobial properties of the paper, the suitable conditions for coating paper were found. The results show that when inclusion mass concentration of 3 mg/mL is coated on the paper, its mechanical properties are improved, the gloss is slightly increased, and the whiteness is basically unchanged. At the same time, the paper has certain antimicrobial properties, which is in line with the principle of "repairing the old as old". CMC-beta similar to CD-SG studied in this paper exhibits properties of reinforcing, slow-releasing and antimicrobial activity for paper protection, which is an innovation of paper protection material, provides the theoretical basis and data reference, as well as a new research idea and technical approach for the development of products for paper protection.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Integrating barrier chemicals into coating systems for optimized white top testliner performance

    Acar, NurayAtik, CelilOrhan, Duygu Bagbakar
    375-384页
    查看更多>>摘要：This investigation examined the development of a coating blend suitable for white top testliner paper to enhance its barrier properties and printability. The research focused on analyzing and elucidating the rheological and barrier properties crucial for the effective application of coating color. A double-coat application process was employed, with the pre-coating layer filling the rough surface profile and the top-coating layer improving the smoothness. Clay and calcium carbonate were used as pigments and latex as binder. Dispersant and thickener were also added. A barrier chemical was also incorporated in select formulations. The results indicated that the coating significantly modified the optical and barrier properties of the paper. The brightness, whiteness, and grease resistance increased, whereas the air permeability decreased. Barrier chemicals were particularly efficacious in reducing wettability and improving grease resistance. In conclusion, this study demonstrates that a well-designed coating strategy can enhance the functionality of recycled paper, rendering it a more viable option for packaging application.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter

    Quantifying optical and mechanical contributions to dot gain

    Ivanda, Katarina ItricMoric, MarkoBrkic, Antun LovroModric, Damir...
    385-394页
    查看更多>>摘要：The origin of dot gain comes from two primary contributions: optical and mechanical, and therefore two functions describing these contributions have been tested. These contributions are reflected in the asymmetric shape of the Line Spread Function (LSF), which is a critical parameter for analyzing the quality of printed images. This paper uses a robust iterative method to fit LSF curves, incorporating multiple single peak functions to increase measurement accuracy and enhance understanding of the phenomenon. High correlation results demonstrate the plausibility of separating these contributions and determining their percentage share within the profile. Optical dot gain, modeled using a Lorentzian function, accurately reflects its dependence on substrate properties. Mechanical dot gain, on the other hand, is described by a Gaussian function, capturing its link to printing techniques. The high correlation (R > 0.97) between experimental and modeled data validates the robustness of this method, enabling precise determination of the percentage share of each component. The results indicate that optical dot gain contributes approximately 30 % of the total, a much larger share than previously assumed. This highlights the importance of substrate selection and treatment in achieving print quality. In the context of electrostatic printing, a third, previously undetected contribution was identified. Although minor, this additional mechanical component (Gauss1) is reproducible and directly linked to the operational state of the printing machine, adding complexity to the dot gain phenomenon.
      原文链接:
    • NETL
    • NSTL
    • Walter De Gruyter