The influence of mechanical refining treatments on the rheosedimentation properties of bleached softwood pulp suspensions

Cellulose ◽  
2018 ◽  
Vol 25 (6) ◽  
pp. 3609-3618 ◽  
Author(s):  
Wei Li ◽  
Yueyue Yang ◽  
Jiulong Sha ◽  
Jinghong Zhou ◽  
Chengrong Qin ◽  
...  
Keyword(s):  
Mechanical Refining ◽  
Pulp Suspensions ◽  
Softwood Pulp

Does kraft hardwood and softwood pulp viscosity correlate to paper properties?

TAPPI Journal ◽  
2016 ◽  
Vol 15 (10) ◽  
pp. 643-651 ◽  
Author(s):  
ROBERT J. OGLESBY ◽  
HUMPHREY J. MOYNIHAN ◽  
RICARDO B. SANTOS ◽  
ASHOK GHOSH ◽  
PETER W. HART
Keyword(s):  
Physical Properties ◽  
Strength Loss ◽  
Strength Properties ◽  
Clear Correlation ◽  
Paper Properties ◽  
Physical Strength ◽  
Pulp Viscosity ◽  
Softwood Pulp ◽  
The Impact ◽  
Related Paper

The impact of commercially prepared, fully bleached pulp viscosity variation on handsheet physical properties was evaluated at different levels of pulp refining. Hardwood pulps from the same brownstock species mix, cooking parameters, and kappa numbers were processed through two different commercial bleach plants: one with a D0(EP)D1D2 sequence and the second with an OD0(EOP)D1 sequence. Additionally, a commercial softwood (predominately Scotts pine) brownstock pulp bleached by an OD0(EP)D1D2 sequence was employed in this study. Pulps with viscosities ranging from 14 to 21 mPa∙s were refined in a Valley beater to two freeness levels, and the associated handsheet physical properties were measured in this study. Over the pulp viscosity range of 14 to 21 mPa∙s, no clear correlation was found to exist between pulp viscosity and related paper physical properties. Finally, a series of laboratory prepared bleached pulps were purposely prepared under non-ideal conditions to reduce their final viscosities to lower values. Handsheets made from these pulps were tested in their unbeaten condition for physical strength properties. Significant and rapid strength loss occurred when the measured pulp viscosity dropped below 12 mPa∙s; overall strength properties showed no correlation to viscosity above the critical 12 mPa∙s value.

From biorefineries to bioproducts: conversion of pretreated pulp from biorefining streams to lignocellulose nanofibers

TAPPI Journal ◽  
2019 ◽  
Vol 18 (4) ◽  
pp. 233-241
Author(s):  
CHENGGUI SUN ◽  
RICHARD CHANDRA ◽  
YAMAN BOLUK
Keyword(s):  
Energy Consumption ◽  
Enzymatic Hydrolysis ◽  
Rheological Behavior ◽  
Material Basis ◽  
Softwood Pulp ◽  
Energy Consumptions ◽  
Hardwood Pulp ◽  
The Stability ◽  
Lignocellulose Nanofibers

This study investigates the use of pretreatment and enzymatic hydrolysis side streams and conversion to lignocellulose nanofibers. We used a steam-exploded and partial enzymatic hydrolyzed hardwood pulp and an organosolv pretreated softwood pulp to prepare lignocellulose nanofibers (LCNF) via microfluidization. The energies applied on fibrillation were estimated to examine the energy consumption levels of LCNF production. The energy consumptions of the fibrillation processes of the hardwood LCNF production and the softwood LCNF production were about 7040-14080 kWh/ton and 4640 kWh/ton on a dry material basis, respectively. The morphology and dimension of developed hardwood and softwood LCNFs and the stability and rheological behavior of their suspensions were investigated and are discussed.

scholarly journals Medium Density Fibreboard Made from Kenaf (Hibiscus cannabinus L.) Stem: Effect of Thermo-mechanical Refining and Resin Content

BioResources ◽  
2014 ◽  
Vol 9 (2) ◽  
Author(s):  
Majid Dehghan Nayeri ◽  
Paridah Md Tahir ◽  
Mohammad Jawaid ◽  
Zaidon Ashaari ◽  
Luqman Chuah Abdullah ◽  
...  
Keyword(s):  
Resin Content ◽  
Hibiscus Cannabinus ◽  
Medium Density ◽  
Medium Density Fibreboard ◽  
Mechanical Refining

Optimizing lignocellulosic nanofibril dimensions and morphology by mechanical refining for enhanced adhesion

2021 ◽  
Vol 273 ◽  
pp. 118566 ◽  
Author(s):  
Peter V. Kelly ◽  
Douglas J. Gardner ◽  
William M. Gramlich
Keyword(s):  
Mechanical Refining

scholarly journals Reduced dispersibility of flushable wet wipes after wet storage

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thomas Harter ◽  
Ingo Bernt ◽  
Stefanie Winkler ◽  
Ulrich Hirn
Keyword(s):  
Industrial Production ◽  
Short Fibre ◽  
Scientific Publications ◽  
Fiber Network ◽  
Sewage System ◽  
Wet Storage ◽  
Softwood Pulp ◽  
Wet Condition ◽  
Cellulosic Fibres

AbstractScientific publications and newsfeeds recently focused on flushable wet wipes and their role in sewage system blockages. It is stated that although products are marked as flushable, they do not disintegrate after being disposed of via the toilet. In this work it is shown that wetlaid hydroentangled wet wipes lose their initially good dispersive properties during their storage in wet condition. As a consequence, we are suggesting to add tests after defined times of wet storage when assessing the flushability of wet wipes. Loss of dispersibility is found for both, wet wipes from industrial production and wipes produced on pilot facilities. We found it quite surprising that the wet wipes’ dispersibility is deteriorating after storage in exactly the same liquid they are dispersed in, i.e. water. This is probably why the effect of wet storage has not been investigated earlier. It is demonstrated that the deteriorating dispersibility of these wipes is linked to the used type of short cellulosic fibres — only wipes containing unbleached softwood pulp as short fibre component were preserving good dispersibility during wet storage. Possible mechanisms that might be responsible are discussed, e.g. long term fiber swelling causing a tightening of the fiber network, or surface interdiffusion.

scholarly journals An extracellular thermo-alkali-stable laccase from Bacillus tequilensis SN4, with a potential to biobleach softwood pulp

3 Biotech ◽  
2014 ◽  
Vol 5 (2) ◽  
pp. 175-185 ◽  
Author(s):  
Sonica Sondhi ◽  
Prince Sharma ◽  
Nancy George ◽  
Prakram Singh Chauhan ◽  
Neena Puri ◽  
...  
Keyword(s):  
Softwood Pulp ◽  
Bacillus Tequilensis

scholarly journals RESEARCHES ON SOLVENT EXTRACTION OF PHYTOSTEROLS FROM TALL OIL IN A VIEW OF FUNCTIONAL FOOD SUPPLEMENTATION

1970 ◽  
Vol 63 ◽  
Author(s):  
Livia Svetlana Pascal ◽  
Rodica Segal
Keyword(s):  
Solvent Extraction ◽  
Functional Food ◽  
Functional Foods ◽  
Low Density Lipoproteins ◽  
Food Supplementation ◽  
Chemical Characteristics ◽  
Low Density ◽  
Tall Oil ◽  
Physical Chemical ◽  
Softwood Pulp

The tall oil is a by-product resulted from the fabrication of softwood pulp by using the sulphate boiling technique. The most important components of the tall oil are the phytosterols, used in cosmetics, medicine. Lately, the phytosterols are introduced in functional foods due to their properties of decreasing the cholesterol in low density lipoproteins (LDL). In this paper the physical-chemical characteristics of the tall oil provided by the Someş, Dej Pulp Plant were studied. As a result of the studied carried out using analytical methods, it was determined that the content in phytosterols of the tall oil is of 2.68%.

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