Characterisation of Wood Particles Used in the Particleboard Production as a Function of Their Moisture Content

Dukarska, Dorota; Rogoziński, Tomasz; Antov, Petar; Krišťák, Ľuboš; Kmieciak, Jakub

doi:10.3390/ma15010048

Cited by 10 publications

(5 citation statements)

References 34 publications

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“…It is generally accepted that the size of the particles affects their mutual "fit" and the quality of their mutual bonding with glue joints. Dukarska et al [66] showed that the particle geometry influences the bulk density of the mats as well as the degree of their compression. Medved and Resnik [67], examining the influence of the particle geometry of the face layers of boards on the bending strength, showed that the increase in particle size and the resulting decrease in the particle surface area causes a decrease in strength.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

et al. 2022

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Although lightweight particleboards have been commercially available for years, they still have a number of disadvantages, including difficulty to process, brittleness, low impact strength, and other mechanical resistance. The aim of the paper was to determine the possibility of producing particleboards of reduced density (dedicated for furniture industry) as a result of using blowing agents from the group of hydrazides, dicarboxamides, or tetrazoles, which were modifiers of the adhesive resin used for bonding the particles of the core layer of three-layer particleboards. The concept presents the possibility of producing low-density particleboards in a standard technological process by modifying the adhesive resin, which has not been practiced by others until now. Analysis of the results of testing the particleboards properties with various types of modifiers (blowing agents), glue content (high 10%/12% and low 8%/10%), differing in glue dosing method, and different particle sizes allowed concluding that the most satisfactory effect was found in particleboards made of the variant modified with p-toluenesulfonyl hydrazide. This variant was characterised by the highest mechanical properties (bending strength, modulus elasticity, and internal bond strength) with high dimensional stability. The presented technology proposal can be applied in the industry.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

et al. 2022

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“…In contrast, that for coarse wood particles was 121 ± 2.50 kg/m 3 and for fine particles, it was 135 ± 1.92 kg/m 3 . Since smaller particles with a lower aspect ratio can fill spaces left by large particles, their bulk densities are higher and the porosity is decreased as a result [37]. According to aspect ratio calculations, TOCS particles were found to have values of 1.52 ± 0.14 and 1.87 ± 0.21, and commercial wood particles were found to have values of 5.69 ± 2.13 and 5.34 ± 2.33 for coarse and fine particles, respectively.…”

Section: Analysis Of Vertical Density Profile and Compaction Ratiomentioning

confidence: 99%

Interaction between particle size and mixing ratio on porosity and properties of tea oil camellia (Camellia oleifera Abel.) shells-based particleboard

et al. 2022

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This study investigated the interaction between particle size and mixing ratio on the porosity of particleboard and in consequence its effect on the physical and mechanical properties of panels. Tea Oil Camellia Shell (TOCS), which could provide 1.8 million tons of lignocellulose raw material annually, can be a useful resource for particleboard production. In that regard, particleboards with different particle sizes (coarse and fine) and mixing ratios (wood and TOCS) bonded with Polymethylene polyphenyl polyisocyanate (pMDI) were investigated. The results showed that particleboard made with TOCS particles had higher densities than those of commercial wood particles. Furthermore, particleboards made with fine particles had lower porosity. The average values for physical and mechanical properties have shown that except for thickness swelling (TS), most properties were better with coarse particles. In terms of all properties, results showed that adding 50% of commercial wood in conjunction with TOCS particles regardless of particle size can offer acceptable results, which qualified all requirements of EN 312:2010 standard for P2-type particleboard (boards for interior fitments (including furniture) for use in dry conditions). In addition, due to the porous structure of the shells, TOCS-based particleboards have better thermal conductivity compared to wood-based particleboards.

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“…In the WBP industry, although the raw material features (e.g., type of raw materials and their geometry) influence the board properties, the hot-pressing operation is one of the most critical steps of the whole panel production, as the properties of the final product depend heavily on the pressing conditions of the wood-furnish mat [3][4][5]. Further, the hot-pressing process is the most expensive part of the entire production and is, therefore, typically defined as its bottleneck.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pressing Schedule and Adhesive Content on the Rheological Behavior of Wood Fiber-Furnish Mats

Shalbafan

Thoemen

2022

Materials

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In this study, for a better understanding of the hot-pressing process, the influence of adhesive content (AC) on various features of a typical pressing schedule for medium-density fiberboard (MDF) production, including fiber mat compressibility, heat transfer during hot-pressing, density profile and board properties, were evaluated. It was found that increasing the AC (urea formaldehyde) leads to faster heat transfer towards the mat’s central plane, mainly due to higher heat release from the adhesive polycondensation reaction. Moreover, the results indicate that the time needed to reach the critical mark of 100 °C in the central plane of the mat depends on the duration of the first densification level (FD). Importantly, the pressure peaks (pmax and p2nd) needed for mat densification are significantly reduced when increasing the AC, which might be attributed to the slippery effect created by the adhesive on the fiber surfaces. The duration of the FD also showed obvious effects on the intermediate density maxima (ρinter) and the core layer density (ρcore). In general, the physical and mechanical properties of MDF panels are significantly impacted by the pressing schedule and AC. All in all, the results of this study are valuable information for refining existing rheological models to improve their accuracy and their ability to simulate the vertical density profile during industrial production.

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Characterisation of Wood Particles Used in the Particleboard Production as a Function of Their Moisture Content

Cited by 10 publications

References 34 publications

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

Interaction between particle size and mixing ratio on porosity and properties of tea oil camellia (Camellia oleifera Abel.) shells-based particleboard

Influence of Pressing Schedule and Adhesive Content on the Rheological Behavior of Wood Fiber-Furnish Mats

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