The aim of the presented research was to determine suitability both non-modified and modified buckwheat husk (BH) as a filler for urea–formaldehyde adhesive in plywood production. effect two modification methods, acetylation silanization, investigated. Infrared spectroscopy outcomes confirmed that silanization had occurred. Based on results, it found introduction BH significant properties characteristics manufactured plywood. application husks led reduction viscosity an extension gelation...

This work examines the possibility of applying non-modified nanocellulose and functionalized with 3-aminopropyltriethoxysilane (APTES) as a formaldehyde scavenger for commonly used urea-formaldehyde (UF) adhesive. The effect silanization was determined use Fourier transform infrared spectroscopy (FTIR), flame atomic absorption spectrometry (FAAS), elemental analysis. Moreover, ability cellulosic nanoparticles to absorb from an aqueous solution investigated. After homogenization, cured UF...

In this study, the possibility of using sawdust, a by-product primary wood processing, as filler (WF) for rigid polyurethane (PUR) foams was investigated. The effects addition 5, 10, 15 and 20% WF particles to matrix on foaming process, cell structure selected physical-mechanical properties such density, thermal conductivity, dimensional stability, water absorption, brittleness, compressive bending strengths were evaluated. Based results, it found that in amount up 10% does not significantly...

The aim of the presented study was to apply various bark species (birch, beech, maple, pine and spruce) as fillers for urea-formaldehyde (UF) resin in three-layer plywood manufacturing. For this purpose, all types were ground added adhesive mixture. resultant subjected investigations following: tensile strength, modulus elasticity (MOE), bending strength (MOR) formaldehyde emission. results indicate a reduction strength. Moreover, lack significant improvement parameters can be explained by...

A significant part of the work carried out so far in field production biocomposite polyurethane foams (PUR) with use various types lignocellulosic fillers mainly concerns rigid PUR a closed-cell structure. In this work, possibility using waste wood particles (WP) from primary processing as filler for open-cell structure was investigated. For purpose, particle fraction 0.315–1.25 mm added to foam concentrations 0, 5, 10, 15 and 20%. The foaming course modified (PUR-WP) characterized on basis...

This research evaluated the possibility of using sawmill by-products from roundwood-processing line in production wood-based panels. Due to its number favorable properties, interesting chemical composition and large reserves resulting lack industrial applications, focused particularly on use bark. Manufactured variants boards differed proportions wood chips bark (70:30, 60:40, 50:50). Moreover, containing only a mixture sawdust were used as references. Urea-formaldehyde adhesive mixed with...

The aim of the study was to investigate effect propylamine addition urea-formaldehyde resin on properties resultant plywood. research consisted in investigating both liquid and cured resins, as well produced Studies have shown that incorporation adversely affected reactivity adhesive mixtures by increasing their pH. evaluation chemical structure with FTIR spectroscopy showed some slight changes indicating reaction formaldehyde introduced modifier. contributed considerable reduction free...

The addition of green tea leaves fractions < 0.315 mm as afiller to urea-formaldehyde resin reduction emission formaldehyde from three-layer birch plywood was investigated. Moreover, other properties such bonding quality and water resistance were It found that had an ability absorb formaldehyde. This phenomenon caused by phenolic compounds contained in leaves. the amount 20% 25% resulted a decrease fromplywood comparing reference sample. Thebonding test showed filler did not affect...

Considering that commonly occurring mold fungi have the ability to develop very quickly on surface of wood chips and ongoing studies finding ways use degraded wood, conducted research was aimed at determining physical mechanical properties chipboards containing various amounts (0%, 30%, 50%, 70%) pine inoculated with Aspergillus Penicillium fungi, varying in a degree infestation. The inoculation did not cause significant changes chemical composition chips; however, it caused decrease pH...

Mold fungi representing genera of Penicillium and Aspergillus commonly develop on the surface freshly harvested wood chips during storage. As a result, they are often considered as low-quality material intended for incineration. Thus, aim present study was to investigate effect infestation with mold their basic chemical physical properties, such as: structure (evaluated FTIR spectroscopy), mass loss hygroscopicity, after an incubation 3, 6 9 weeks. Based visual assessment ergosterol content...

ABSTRACTThe application of commonly used flame retardants in most cases causes reduction strength characteristic particleboard. Therefore, it was decided to carry out research aimed at determining possibility using pMDI-reinforced PF adhesive produce board with increased fire resistance. The effect different shares particles impregnated a mixture potassium carbonate and urea on the particleboard properties such as density, density profile, bending strength, modulus elasticity, internal bond...

Engineered wood products, such as glulam beams, attract much attention from the building industry in recent years. Therefore, there is a constant necessity to seek new models of structural which assume use outsized sawn pieces an alternative for standard construction timber. Three variants composed main yield and side boards arranged various structures, were proposed. Moreover, usefulness wedge-jointed, small-sized timber was also investigated. The manufactured beams tested, terms their...

This paper discusses the current status of European research reactor (RR) fleet and identified opportunities for its utilization. The data this analysis was collected through a specific questionnaire from which database RR created. designed to assess degree exploitation different applications identify gaps future results indicate that is older compared world average, with no new reactors built in Europe since 1992. majority RRs reported low levels across all applications, desire expand...

The production of plywood from impregnated veneers allows a wood-based product protected in the entire cross-section to be obtained.The conducted research was focused on properties with mixture potassium carbonate and urea, such as pH, wettability, colour change surface roughness.In addition, produced melamineurea-formaldehyde resin, shear strength formaldehyde emission, were subject well.It found that characterized by an increased completely different unchanged roughness.Moreover,...

A significant amount of logging residue is produced during roundwood harvesting. Logs are often left in forest sites due to, for example, ecological or logistical aspects. Taking into account the fact that number studies focused on changes properties very low, it was decided to conduct research effect a three-year storage period stands chemical and energy potential wood. The design allowed determination up three years storage. performed analysis showed highly negative impact characteristics...

As a result of the progressing climate changes, there is an increase in volume pine deadwood harvested each year from Polish forests. Its presence important part forest ecosystem; however, are some indications that material obtained dying trees can be characterized by lower quality and properties. Taking into account growing issue tree dieback, wood annually Poland, importance wooden products economic standpoint, preliminary research aimed at recognizing process its effect on mechanical...

Nowadays, a significant increase in interest renewable energy sources can be observed. Wind farms have been one of the solutions representing this trend for many years. One important elements windmills is blades. The data indicate that what to do with blades after their use global problem, and so it find way recycle them. Hence, work aimed these production wood-based materials. Two fractions fragmented blade were used tests: small large one. Boards characterized by densities 650 kg/m3 700...

The aim of this study was to apply waste wood particles (WP) with different sizes from primary processing as a filler for open-cell PUR foams. For purpose, various particle were added polyurethane foams (PUR). effects the addition 0.05–<0.125 mm, 0.125–<0.315 0.315–1.25 and >1.25–2.0 WP matrix on density, kinetics foaming, cell structure, morphology investigated. Scanning electron microscope (SEM) X-ray computer tomography used. Based results, it found that in amount 10% leads an...

The aim of this study was to investigate the applicability sugar beet pulp (SBP) in particleboard production as a substitute for wood material. Two variants board density, 650 kg/m3 and 550 kg/m3, containing 0%, 25% 50% SPB, were evaluated. During following features measured: modulus rupture (MOR), elasticity (MOE), thickness swelling (TS) water absorption (WA). results showed that boards up SBP meet standards general-purpose used dry conditions. Further increases content deteriorated some...

Despite many outdoors applications, the number of works aimed to determine effect changing conditions on properties glulam beams, in particular those produced non-standard arrangements, is few. Therefore, aim this study was assess changes flexural strength (MOE, MOR) beams stored for 30 months varying conditions. Analyzed variants pine GLT included five-meter-long structural elements reinforced with oak timber, high-quality timber and steel rods both roofed shed inside climatic chamber....