Influence of moisture content on the mechanical properties of selected wood-based composites

Sala, Conrad M.; Robles, Eduardo; Gumowska, Aneta; Wronka, Anita; Kowaluk, Grzegorz

doi:10.15376/biores.15.3.5503-5513

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…The noticeable decreases of the MOR and MOE values over 65% relative air humidity are in line with the results obtained by other researchers [17], who observed that these reductions are more intensive for fibrous panels of higher density when the relative air humidity is raised from 65% to 95%. A similar tendency for strength reduction for different wood-based composites when MC increases was also found by other researchers [32][33][34][35].…”

Section: Mechanical Propertiessupporting

confidence: 88%

Effect of Variable Conditions of Exposure on the Physical and Mechanical Properties of Blockboards

Zeleniuc

Coşereanu

2022

Applied Sciences

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The growing demand for wood and the continued increase of the raw material price have resulted in companies using more efficient wood resources in wood-based products such as blockboard. These boards are used in the field of interior design, especially. The aim of this research was to evaluate the effect of variable environmental conditions on the physical and mechanical properties of blockboard (BK). Two types of commercial BK were exposed in variable environmental conditions (kitchen, bathroom and climatic chamber) for three months. The BK structures were composed of veneer (V) and high-density fibreboards (HDF) for the face sheets and glued, solid wood, resinous strips for the core. The temperature and relative humidity of the air (RH) ranged from 18 °C to 25 °C and from 25% to 90%, respectively. In the climatic chamber (CC), the dynamics of the parameter variations were different than in the other two exposure climates, being determined by the programmed cyclic changes in RH. The changes observed on physical and mechanical properties were more extreme for the blockboards tested in the CC than in the kitchen (K) and bathroom (Ba). After 3 months of exposure in the CC, the thickness and weight of the boards increased by 1.8 and 1.1 times, respectively, for veneered BK, and by 4.4 and 0.4 times, for BK with HDF faces, compared to values recorded in the kitchen. The panels exposed in the CC exhibited the highest increase in moisture content (MC): 41% for veneered BK and 82% for BK with HDF faces after three months of exposure, followed by those exposed in the bathroom and kitchen. Increases in MC determined decreases of flexural properties and soundness surfaces, more evident for HDF face structures compared to V ones.

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Section: Mechanical Propertiessupporting

confidence: 88%

Effect of Variable Conditions of Exposure on the Physical and Mechanical Properties of Blockboards

Zeleniuc

Coşereanu

2022

Applied Sciences

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“…A great portion of the samples exhibited disintegration under these conditions. Consequently, given that a substantial rise in moisture content is adverse for these wood composites, even slight fluctuations in moisture can lead to a decline in the strength parameters [52].…”

Section: The Thickness Swelling and Water Absorption Testsmentioning

confidence: 99%

Upcycling of Wood Dust from Particleboard Recycling as a Filler in Lignocellulosic Layered Composite Technology

Wronka,

Kowaluk

2023

Materials

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The following research aims to investigate selected properties of three-layer plywood, manufactured using dust from the milling of three-layer particleboard as a filler in the bonding mass. Four types of fillers were considered in the study: commercial rye flour, wood dust naturally occurring in the composition of particles used industrially for particleboard production, wood dust from the first batch of shredded particleboard, and dust from the second round of milled particleboard. The highest modulus of elasticity (MOE) values were observed for the reference samples. Notably, in the samples containing filler sourced from the secondary milling of particleboard, the MOE exhibited an upward trend in conjunction with increasing filler content. The modulus of rupture (MOR) decreased with an elevated degree of filler milling from 73.1 N mm−2 for the native filler, through to 68.9 N mm−2 for the filler after 1st milling, and to 54.5 N mm−2 for the filler after 2nd milling (with 10 parts per weight (pbw) of filler used as an reference), though it increased slightly as the filler content increased. The most favorable outcomes in shear strength were achieved in samples containing filler material from the initial milling of particleboard. The thickness swelling peaked in variants utilizing filler material from both the initial and secondary milling of particleboards (20.1% and 16.6% after 24 h of soaking for samples with 10 pbw filler after the 1st and 2nd milling, respectively, compared to 13.0% for the reference samples). Water absorption testing exhibited a more pronounced response in the newly introduced variants, although the samples containing filler from the initial and secondary milling processes eventually yielded results akin to the reference sample, with naturally occurring dust displaying higher water absorption values. The highest density values (about 1224 kg m−3) were observed in the reference samples. A similar density profile was recorded for samples with five parts of wood flour as filler, although the density of the bonding line was slightly lower in these instances (1130 kg m−3). This research confirms the feasibility of applying the aforementioned dust as an alternative to conventional fillers in plywood technology. It also raises the question of how to effectively remove glue residues from wood-based composite dust, which would enhance their absorption properties.

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“…Studies on the properties of thin and ultra-thin furniture panels can be found in the specialised literature. Mainly, these are studies of plywood [4][5][6][7][8], PB [5,9], MDF [3,5,[8][9][10][11][12][13], oriented strand board (OSB) [9] or a combination of some of them [3]. Some authors are looking at possibly reinforcing wood-based panels to increase strength and deformation properties, such as with thin aluminium sheets [14].…”

Section: Introductionmentioning

confidence: 99%

Possibilities for Efficient Furniture Construction Made of Thin and Ultra-Thin Materials by Using Mitre Joints

Petrova,

Jivkov,

Yavorov

2023

Materials

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One of the biggest challenges for designers and manufacturers of furniture is to reduce the thickness of conventional furniture materials such as particleboard (PB), medium-density fibreboard (MDF) and plywood. Designing furniture based on thin (less than 16 mm) and ultra-thin materials (less than 10 mm) is desirable for aesthetic reasons and because of the substantial material savings. However, the use of thin and ultra-thin materials reduces the strength of the furniture, especially the strength and deformation resistance of the joints. This study aimed to establish the possibilities for efficient furniture construction made of thin and ultra-thin materials using mitre joints. For this purpose, 14 types of L-type joints were tested: 12 glued and 2 detachable. The joints were made of eight wood-based panels and one non-wood panel. The bending moments and the stiffness coefficient under compression were determined. The obtained results show that the mitre joints made of laminated material with high-pressure laminate (HPL), 8 mm thick, MDF achieved the highest bending moment, and the highest stiffness coefficient was achieved by joints made of 10 mm thick compact HPL. Compact HPL joints were significantly affected by the type of adhesive used. Detachable joints had a relatively high bending strength but very low stiffness.

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Influence of moisture content on the mechanical properties of selected wood-based composites

Cited by 8 publications

References 9 publications

Effect of Variable Conditions of Exposure on the Physical and Mechanical Properties of Blockboards

Effect of Variable Conditions of Exposure on the Physical and Mechanical Properties of Blockboards

Upcycling of Wood Dust from Particleboard Recycling as a Filler in Lignocellulosic Layered Composite Technology

Possibilities for Efficient Furniture Construction Made of Thin and Ultra-Thin Materials by Using Mitre Joints

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