Rheology in papermaking — from fibre suspension flows to mechanics of solid paper

Hämäläinen, Jari; Eskola, Roope; Erkkilä, Anna-Leena; Leppänen, Teemu

doi:10.1007/s13367-011-0026-2

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…At this stage, the transparentizing agent always exhibited a low viscosity level. Thus, the penetration speed in the base paper was not affected significantly when the concentration of transparentizing agent did not exceed 30%, i.e., the optimum concentration was 30% (Hämäläinen et al 2011).…”

Section: Effects Of Transparentizing Agent Concentration On Its Application Effect Effects Of Concentration Of Transparentizing Agent On mentioning

confidence: 93%

Preparation and characterization of polydimethylsiloxane-based paper transparentizing agent and its application in paper coating

Gao

Tian

2020

BioRes

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A new type of polydimethylsiloxane-based paper transparentizing agent was prepared via a combined method. The performance of the transparentizing agent was investigated systematically by adding and dipping, with use of the surface sizing device of a paper machine. Optimum performance was found at 30% concentration of the transparentizing agent and 30 to 45 °C of dipping temperature. Under the optimal conditions, the transparentizing t agent achieved a rapid penetration in the base paper and filled in the pores of the paper, to be further effectively adsorbed and retained on the fiber surface. The transparency of test paper reached as high as 76±0.97 %, which was 37±1.4% higher than that of the control. However, the addition of transparentizing agent reduced the mechanical strength of paper slightly. The as-prepared transparentizing agent was found to exhibit excellent application stability and biodegradability when applied in the paper machine，When used as plastic film, the transparent paper would lose its strength completely after eight weeks. The resulting transparent paper can be used to develop paper-based film and other related plant based transparent/ translucent paper, which has great potential in replacing plastic products and eliminating white pollution.

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Section: Effects Of Transparentizing Agent Concentration On Its Application Effect Effects Of Concentration Of Transparentizing Agent On mentioning

confidence: 93%

Preparation and characterization of polydimethylsiloxane-based paper transparentizing agent and its application in paper coating

Gao

Tian

2020

BioRes

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“…A lack of freely available water decreases the lubricating fluid layer between particles and causes the slurry to become unsaturated. In an unsaturated slurry, the fluid layer gets replaced by air, which causes the fibrous particles to become further entangled and agglomerate to larger flocs or fiber networks [24]. The agglomerated fibers behave as a wet granular material with a high apparent viscosity that causes shearing difficulties and poor mixing.…”

Section: Research Articlementioning

confidence: 99%

Impact of particle size reduction on high gravity enzymatic hydrolysis of steam-exploded wheat straw

Hoppert

Einfalt

2021

SN Appl. Sci.

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Economically feasible bioethanol production from lignocellulosic biomass requires solid loadings ≥ 15% dry matter (DM, w/w). However, increased solid loadings can lead to process difficulties, which are characterized by high apparent slurry viscosity, insufficient substrate mixing and limited water availability, resulting in reduced final glucose yields. To overcome these limitations, this study focused on enzymatic hydrolysis of 10–35% DM solid loadings with steam-exploded wheat straw in two different particle sizes. At solid loadings of 20 and 25% DM small particle size of ≤ 2.5 mm yielded 16.9 ± 1.1% and 10.2 ± 1.4% increased final glucose concentrations compared to large particle size of 30 ± 20 mm. Small particle size also positively influenced slurry viscosity and, therefore, miscibility. As a key finding of this investigation, high gravity enzymatic hydrolysis with solid loadings of 30–35% DM was indeed successfully employed when wheat straw was applied in small particle size. Here, the highest final glucose yield was achieved with 127.9 ± 4.9 g L−1 at 35% DM solid loading. An increase in the solid loading from 10 to 35% DM in small particle size experiments resulted in a 460% increase in the final glucose concentration.

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Mathematics in paper

Hämäläinen

2012

Mathematics in Industry

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This paper aims to give a general overview of industrial mathematics applied to papermaking. Modelling challenges vary from computational fluid dynamics (CFD) to finite-element analyses (FEA) when the paper web transforms from a multiphase flow to a solid fibre network -to a ready paper. Also, different length scales are present from fibre level to machine level problems, i.e. from millimetres up to one hundred metres. Mathematical modelling of papermaking is aiming at optimizing the process and the end-product. Thus, computational tools for optimal shape design and optimal control purposes have been developed.

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Rheology in papermaking — from fibre suspension flows to mechanics of solid paper

Cited by 3 publications

References 23 publications

Preparation and characterization of polydimethylsiloxane-based paper transparentizing agent and its application in paper coating

Preparation and characterization of polydimethylsiloxane-based paper transparentizing agent and its application in paper coating

Impact of particle size reduction on high gravity enzymatic hydrolysis of steam-exploded wheat straw

Mathematics in paper

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