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Strength of High-Density Wood-Based Panels Reinforced with Melamine Films

Lipski Adam, Karolewski Sebastian

Drewno : prace naukowe, doniesienia, komunikaty

2025

Vol. 68, nr 215

Art. no. 200039

Wood-based panels are a group of products with a wide range of applications. They are not obtained from solid wood, but are made from wood fragments, such as wood chips, sawdust or wood dust, which are usually waste from production. The recycled material, after being mixed with a binder, is compressed. As a consequence of such a process, different types of boards are obtained: MDF (Medium-Density Fiberboard), HDF (High-Density Fiberboard), fiberboard or particleboard. In response to the problems accompanying the use of MDF and HDF boards, a new type of wood-based boards has been developed, called CDF (Compact Density Fiberboard). In this study the strength properties of CDF panels reinforced with melamine films were investigated for four thicknesses: 6.4 mm, 8.4 mm, 10.4 mm and 12.4 mm. Young’s modulus E, tensile strength Rm and percentage total extension at fracture At were determined by a static tensile test. The results of the strength tests of wood-based panels were subjected to statistical analysis to determine the effect of the thickness of the panel on its strength. CDF boards have a low total elongation at break of about 0.5%, and exhibit greater stiffness, with a Young’s modulus of at least 5,600 MPa. The statistical analysis shows that for boards up to 12.4 mm thick, their thickness usually does not affect the strength properties. The only exception is in the Young’s modulus values for a thickness of 12.4 mm.

Effect of Calcium Lignosulfonate Additive on Some Physical and Mechanical Properties of High-Density Fiberboard

Çamlibel Osman, Ayata Ümit, Peker Hüseyin

Drewno : prace naukowe, doniesienia, komunikaty

2024

Vol. 67, nr 214

Art. no. 195844

Calcium lignosulfonate (CLS) (C20H24CaO10S2) is widely used in various industries today, including wood, construction, food, agriculture, and textiles. There are currently few studies on the addition of CLS chemicals to various fiberboards. This study was designed to explore the outcomes of the interaction between CLS and the boards, with the aim of expanding the potential applications of this chemical. We incorporated CLS at varying percentages (6%, 8%, and 10%) as an adhesive additive in high-density fiberboard (HDF) produced using urea-formaldehyde (UF) resin in a laboratory setting. We assessed its impact on several physical properties - thickness swelling (TS), den-sity, and water absorption (WA) - and mechanical properties: modulus of rupture (MOR), internal bond strength (IB), modulus of elasticity (MOE), and surface soundness (SS). A control group was created using prepared boards, enabling the comparison of results between boards made with and without CLS additives. According to the results of a multivariate analysis of variance, the CLS per-centage showed no significant effect on density, MOE, and SS. However, it significantly influenced TS, WA, IB, and MOR, resulting in reductions of 4-12% for SS, 6-12% for MOR, and 2-22% for IB, while increasing TS by 20-130%, WA by 25-84%, and MOE by 1-3%. It was observed that the use of CLS led to differing results in the tests conducted on the produced HDF materials.