Paper chemistry: Wet pressing of wheat straw pulp – correlations between dewatering parameters

Rousu, Päivi; Malinen, Heli; Hultholm, Tom; Jokinen, Mikko; Kajanto, Isko; Paltakari, Jouni; Manner, Hannu

doi:10.3183/npprj-2010-25-03-p277-287

Cited by 3 publications

(2 citation statements)

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“…However, it is still an issue to be improved. It also shows a higher dry solids level after wet pressing and a higher wet tensile strength measured at the same dry solids content (Rousu et al 2010;Muravyev 2010).The main aim of this study was to obtain information about the influence of microparticle retention aids on the drainage and retention of non-wood containing furnish. Moreover, special attention was paid to the dewatering of non-wood pulp containing furnish.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the main problem relating to the environmental discharges of conventional soda/soda-AQprocesses, the poor dewatering properties of typical non-wood pulps are challenging. The environmental problems and partially the dewatering problems can be solved by selecting a suitable pulping process (Nie 2007;Rousu et al 2010). Dewatering can also be improved by a partial removal of fines (Cheng 1994;Cheng and Paulapuro 1996a and b;Rousu and Hytönen 2007).…”

Section: Introductionmentioning

confidence: 99%

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Drainage and retention enhancement of a wheat straw-containing pulp furnish using microparticle retention aids

Vishtal

Rousu

Hultholm

et al. 2011

BioRes

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The usage of non-wood pulps in furnishes for the production of various paper grades is a real alternative for the substitution of wood pulp in papermaking. In terms of the papermaking process, the main limiting factor for non-wood pulp utilization is poor dewatering. This problem can be partially solved by means of retention aids, and the modern microparticle-based retention aids are very promising for this application. In this study the main aim was to characterize how the microparticle retention systems affect the retention, dewatering, and formation of a non-wood pulp furnish and how these effects and mechanisms differ when compared to normal wood pulp. The performance of several commercially available retention aids was studied by making dynamic sheet forming tests for reference and an organosolv wheat straw furnish. The emphasis in the experiments was on drainage enhancement. The maximum drainage gain obtained with the bentonite-CPAM retention aid system was about 5%. Despite the improved drainage, dewatering of the reference furnish was better than for the non-wood containing furnish.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drainage and retention enhancement of a wheat straw-containing pulp furnish using microparticle retention aids

Vishtal

Rousu

Hultholm

et al. 2011

BioRes

Self Cite

View full text Add to dashboard Cite

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Anatomical, morphological and chemical characteristics of kaun straw (Seetaria-ltalika)

Ferdous

Quaiyyum

Bashar

et al. 2020

Nordic Pulp &Amp; Paper Research Journal

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AbstractAnatomical, morphological and chemical characteristics of kaun straw were examined to assess their suitability for paper production and the properties were compared with wheat straw and rice straw. It was found that the fiber length of kaun straw is slightly shorter than that of wheat straw and longer than that of rice straw. It has wider fiber wall thickness than that of wheat straw and rice straw. It had acceptable derived values, especially slenderness ratio, which was lower than that of wheat straw and rice straw, and higher runkel ratio and lower flexibility coefficient. Chemical analysis of kaun straw revealed satisfactory levels of α-cellulose content (35.9 %) and klason lignin content (19.3 %). The ash content in kaun straw (7.32 %) showed lower value than that of wheat straw and rice straw. In optimum cooing conditions, kaun straw produced pulp yield of 30.0 % and 41.7 % with kappa number 15.1 and 22.5 in soda-AQ and formic acid pulping processes, respectively, the values of which were lower than that of wheat straw and rice straw.

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Carbon emissions analysis of the pulp molding industry: a comparison of dry-press and wet-press production processes

Lv,

Jiang,

Wei

et al. 2023

Nordic Pulp &Amp; Paper Research Journal

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An initial carbon emission calculation formula for the pulp molding industry was first proposed in accordance with the calculation guidelines provided by the Intergovernmental Panel on Climate Change (IPCC). The formula was primarily developed by utilizing the greenhouse gas accounting methods used in the pulp and paper industry and the life cycle assessment (LCA) theory. Carbon dioxide emissions coming into being during the production processes of dry-press and wet-press pulp molding were calculated individually, alongside the carbon emission factors throughout the lifecycle of the products. This study also delivers a comparative analysis of pulp molding products and similar cushion packaging materials. Moreover, the findings reveal that during the production phase, particularly in the formative stages of pulp molding, substantial carbon dioxide emissions would be produced, with dry-press pulp molding products exhibiting markedly higher carbon emission factors than their wet-press counterparts. The primary objective of achieving low-carbon transformation for the pulp molding industry was to reduce the carbon emissions caused by the forming process, primarily by improving the forming process and enhancing energy efficiency or utilizing clean energy.

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Paper chemistry: Wet pressing of wheat straw pulp – correlations between dewatering parameters

Cited by 3 publications

References 0 publications

Drainage and retention enhancement of a wheat straw-containing pulp furnish using microparticle retention aids

Drainage and retention enhancement of a wheat straw-containing pulp furnish using microparticle retention aids

Anatomical, morphological and chemical characteristics of kaun straw (Seetaria-ltalika)

Carbon emissions analysis of the pulp molding industry: a comparison of dry-press and wet-press production processes

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