WOOD RESEARCH Volume 71, Number 1, 2026
MONIKA STANKOVSKÁ, ANDREJ PAŽITNÝ, ŠTEFAN BOHÁČEK, ALBERT RUSS, and Elena Opálená

THE EFFECT OF FIBRILLATED CELLULOSE PREPARED FROM THE DISTILLERY CORN REFUSE ON POROSITY OF PAPER FILTERS

This study exploited the possibility of using corn distillery refuse as a cheap source of nanocellulose production. Coarse fibrillated cellulose and very fine particles were extracted by acid-alkali extraction. Two methods were compared where either acidic extraction took place before alkaline extraction or with the extraction in a reversed order. The effectiveness of removing hemicellulose and lignin was determined by IR Fourier transform spectroscopy. The optimal technique of application of fibrillated cellulose with added solutions of metal cations with antimicrobial properties on HEPA filter was selected. The optimal conditions were the alkali extraction followed by the acidic extraction and optimal application of solution of fibres and metal ions on filter paper was achieved using rod. The efficiency of filter materials was tested on a filter device with using of two model microorganisms and results showed that it is necessary to consider both the type of fibres, their optimal coating on filter paper as well as the morphology of microorganisms. The mixture of Cu, Al, Mg, Ca and Zn metal ions was sufficient for effective disinfection.

WOOD RESEARCH Volume 70, Number 3, 2025
MATEUSZ SZAR, JAROSŁAW KOZAK, BEATA SIEKIERKA, WOJCIECH SPISAK, GRZEGORZ BOCZKAL, ŠTEFAN BOHÁČEK, DANIELA MAJERČÁKOVÁ, and ANDRZEJ CHLEBICKI

ROCK-CELLULOSE COMPOSITES IN SOIL VENTILATION DUCTS FOR COMPACTED SOILS. Short notes

Soil Ventilation Ducts (SVDs), produced from a rock–cellulose composite was prepared by mixing short-fibre cellulose with granite gravels, compressed into cylindrical briquettes. The SVDs were tested in compacted soil (compaction > 2.1 MPa) to assess their effect on water infiltration dynamics. The results confirmed the efficiency of SVD in enhancing soil water infiltration both under natural rainfall conditions and in controlled experiments increasing the volumetric water content from 35% to nearly 70%, while no change was observed in the control. Additionally, results from a controlled experiment demonstrate that the application of SVD substantially enhanced water infiltration. Registered absorption time of 4.7 litres of water on surface area of 615.75 cm² was 1440 min for the control (without SVD), 14.5 min at 15 cm SVD length, 2.5 min at 30 cm SVD length, and 2 min at 45 cm SVD length, indicating a strong positive relationship between SVD length and infiltration efficiency.

WOOD RESEARCH Volume 69, Number 4, 2024
MONIKA STANKOVSKÁ, JURAJ KRIŠTA, ŠTEFAN BOHÁČEK, ALBERT RUSS, and ANDREJ PAŽITNÝ

COMPARISON OF TWO METHOD FOR ISOLATION OF FIBRILLATED CELLULOSE FROM LIGNOCELLULOSIC BIOMASS

Fibrillated cellulose from distillery refuse based on maize starch was prepared by two different procedures. The effect of sonification was evaluated atacid-alkali extractionas well as the type of used acid. The results from the alkali-acid procedure were compared with these obtained by method of steam explosion at different temperatures. The acid-alkali method brings a better result regarding degradation of hemicellulose and lignin as well as cellulose. Lignin/hemicellulose were only released from lignocellulose network using steam explosion at 120-180°C. At higher temperature, the results were comparable with those obtained by acid-alkali method. Similarly pore size distribution of filter paper decreased more significantly when fibrillated cellulose from acid-alkali treatment was applied. After steam explosion, higher extend of longer still fibres remains

WOOD RESEARCH Volume 69, Number 2, 2024
VLADIMÍR IHNÁT, HENRICH LÜBKE, ALBERT RUSS, JOZEF BALBERČÁK, VLADIMÍR KUŇA, ANDREJ PAŽITNÝ, and ŠTEFAN BOHÁČEK

LIGNOCELLULOSIC LINERS BASED ON WOOD WOOL

Basic physical and mechanical properties of lignocellulosic liners up to 1.5 mm thick with a compact and non-crumbling surface based on wood wool and thermoplastic water based glues were determined. PVAc and starch glue with a high proportion of water content were used. The dry mat was pressed gradually under high pressure up to 28 MPa and a temperature of around 190°C with the release of steam. Tests according to the CEPI (Confederation of European Paper Industries) standards were adopted. Procedures for tensile strength according to ISO 1924-2 (2008), Burst strength according to ISO 2758 (2014), puncture according to ASTM D781-68 (1973), water absorption according to ISO 5637 (1989) and porosity according to TAPPI Test method T460 were applied

WOOD RESEARCH Volume 69, Number 2, 2024
ŠTEFAN BOHÁČEK, VLADIMÍR KUŇA, JOZEF BALBERČÁK, and ALENA JANDOVÁ

INCREASING THE EFFICIENCY OF ENZYMATIC HYDROLYSIS OF LIGNOCELLULOSIC MATERIALS BY FREEZING PRETREATMENT

This paper describes the differences between the efficiency of enzymatic hydrolysis of selected lignocellulosic materials after pretreatment by cyclic freezing and thawing. It also discusses the analysis of the positive effect of alkaline conditions on pretreatment. The selected materials were Populus alba L., wheat straw from Triticum aestivum L. and Cannabis sativa. Three pretreatment methods were used to compare the efficiency of enzymatic decomposition of cellulose and cellulose accessibility. The best results show the wheat straw pre-treated at -20°C in the freezer with NaOH addition with a concentration of monosaccharides of 56.6 g.l-1 compared to initial hydrolysed material with a concentration of monosaccharides of 24.4 g.l-1. The results show better digestibility of grass compared to wood dendromass

WOOD RESEARCH Volume 69, Number 1, 2024
VLADIMÍR IHNÁT, HENRICH LÜBKE, RASTISLAV ČEREŠŇA, JOZEF BALBERČÁK, VLADIMÍR KUŇA, ANDREJ PAŽITNÝ, and ŠTEFAN BOHÁČEK

THIN LIGNOCELLULOSIC LINERS BASED OF SPRUCE SHAVINGS

The article is devoted to determining the basic physical and mechanical properties of sheet materials up to 1.5 mm thick based on wood shavings and PVAc glue with a high proportion of water, pressed under high pressure up to 25 MPa and a temperature of around 190°C, so that the softening of lignin caused by the generated steam, allow to create a compact and non-crumbling surface. In order to characterize the physical-mechanical properties of the new wood-based sheet material with minimum thickness and characteristic elasticity, tests according to the CEPI (Confederation of European Paper Industries) standards were adopted. Procedures for tensile strength according to ISO 1924-2 (2008), Burst strength according to ISO 2758 (2014), puncture according to ASTM D781-68 (1973), water absorption according to ISO 5637 (1989) and porosity according to TAPPI Test method T460 were applied