New model for predicting tensile strength and density of eucalyptus handsheets based on an activation parameter calculated from fiber distribution characteristics

Pulkkinen, Iiro; Fiskari, Juha; Alopaeus, Ville

doi:10.1515/hf.2010.030

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…This would explain the higher bulk of E. globulus. It has been reported by Pulkkinen et al (2010) that increase of fiber cell wall thickness decreases WRV of the fibers. This also suggests fiber cell wall thickness contributes significantly more than fiber charge or surface composition for WRV, bulk, and tensile index of the pulp sheet.…”

Section: Refining Of Chemical Pulpsmentioning

confidence: 89%

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Antes¹,

Joutsimo²

2015

BioResources

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The SuperBatch™(SB), CompactCooking™(CC), and Lo-Solids™ (LS) modified cooking methods were evaluated relative to the cell wall surface and paper technical properties of bleached Eucalyptus globulus and Eucalyptus nitens. E. globulus pulps presented higher screened yield and brightness than E. nitens, which needed higher H-factor to reach a kappa number target. Independently of the cooking method or species, all the samples consumed similar amounts of ClO2 to reach a brightness of 90% ISO. E. nitens pulps showed lower carbohydrates and higher extractives content on the fiber surface, regardless of the cooking method. E. nitens presented slightly higher surface charge of the bleached pulps. Surface charges of CC and LS pulps were higher independently of cooked Eucalyptus species. Water retention value (WRV) for E. nitens pulps were higher than for E. globulus. No differences were observed in refinability of different cooking methods, however E. nitens pulps showed higher tensile and lower bulk compared to E. globulus. E nitens presented a thinner fiber cell wall than E. globulus. This seems to be more relevant for paper technical properties and WRV than fiber charge or surface composition. No correlation between surface composition, fiber surface properties, and paper technical properties among the cooking methods could be determined.

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Section: Refining Of Chemical Pulpsmentioning

confidence: 89%

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Antes¹,

Joutsimo²

2015

BioResources

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“…According to Pulkkinen et al 33 the apparent sheet density is mainly governed by interfiber bonding ability. Here, E-SAQ samples exhibited only slightly lower density than the SAQ samples.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Combined Production of Polymeric Birch Xylan and Paper Pulp by Alkaline Pre-extraction Followed by Alkaline Cooking

Testova

Roselli

Costabel

et al. 2014

Ind. Eng. Chem. Res.

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Alkaline pre-extraction of birch wood was performed to isolate polymeric xylan and subsequently produce a paper-grade pulp. At 95°C and 2.5 mol/L NaOH, 7% of wood was transferred to the E-lye as polymeric xylan with an anhydroxylose-lignin ratio of 6.5. Xylan with a weight-average molar mass of 20 kDa was quantitatively precipitated from the solution previously concentrated from 7.4 to 37 g/L. The anhydroxylose-lignin ratio in the carbohydrate fraction increased to 29 g/g upon precipitation. Enzymatic hydrolysis of the commercial birch xylan with Pentopan Mono PG resulted in a uniform xylooligosaccharide product with low xylose content at a yield of 61%. The pre-extracted pulp had excellent papermaking properties but its yield was 4.9% units lower than that of the reference pulp. Commercial potential of the modified process was discussed.

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“…Fiber bonding and network activation was characterized with a fiber network activation parameter developed by Pulkkinen et al (2010) for eucalyptus clone sample characterization:…”

Section: Model Equationsmentioning

confidence: 99%

“…Water inside fiber cell walls improves the bonding ability and increases fiber network activation. Accordingly, high network activation results in high tensile strength (Mohlin and Salmén 2005;Pulkkinen et al 2010). Fiber quality plays an important role in this problem complex.…”

Section: Introductionmentioning

confidence: 99%

The effect of fiber dimensions on fiber network activation and tensile strength

Pulkkinen¹,

Alopaeus²

2012

Holzforschung

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The objective of this work was to check the fiber network activation parameter developed earlier by the authors for eucalypt pulp fibers to predict technical properties of paper. The fiber size analyses were performed with an optical fiber analyzer that applies 2D image analysis techniques on single fibers. The effects of fiber length, fiber width, fiber wall thickness, and fiber curl distributions on the quality potential of eucalypt fibers were evaluated. Fiber curl and fiber wall thickness based parameters were found to have a high potential for evaluation of eucalypt fiber quality. The variations in technical properties of paper were explained with differences in fiber wall thickness and fiber curl distributions. When the model was tested against industrial long fiber pulps, a further modification for fiber length was needed. The Page tensile strength model and the shear-lag theory were applied for comparison of the results obtained by the network activation model. With the approach presented in this article, the strength characteristics of hardwood and softwood pulps can be easily evaluated based on fiber geometry and water retention value.

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New model for predicting tensile strength and density of eucalyptus handsheets based on an activation parameter calculated from fiber distribution characteristics

Cited by 5 publications

References 6 publications

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Combined Production of Polymeric Birch Xylan and Paper Pulp by Alkaline Pre-extraction Followed by Alkaline Cooking

The effect of fiber dimensions on fiber network activation and tensile strength

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