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<p>The composition of manufactured wood-based boards is influenced by variations in the availability of input materials caused by changes in forestry practice. The effect of substituting the ubiquitous Norway spruce (<i>Picea abies</i> L. Karst) was studied in manufacturing single-layer oriented-strand boards (OSBs) with larch (<i>Larix decidua</i>), alder (<i>Alnus glutinosa</i> (L.) Gaertn.) and birch (<i>Betula pendula</i>) at compositions of 10, 15 and 20%. The boards with 3% pMDI resin and 0.5% wax were made and their standard physical, mechanical and thermophysical properties were measured. Strands made from the broadleaf wood species (alder and birch) were wider than those from spruce, and lower wood density was associated with a higher slenderness ratio. The slenderness and flatness ratios of alder strands were 9.6% and 33.3% higher than those of spruce, 54.2% and 100.0% higher than those of larch, and 45.1% and 44.0% higher than those of birch. Substituting 10–20% of spruce strands with larch, alder, or birch improved the dimensional stability and mechanical properties of the boards. All boards met the EN 300 (for OSB/3) requirements for bending strength, internal bond strength, and thickness swelling, whereas modulus of elasticity values met the standard in all cases except for boards containing 15% alder. Alder and larch are the most suitable alternative species for replacing spruce. The higher internal bond strength observed in mixed-species boards indicates potential for reducing adhesive consumption in OSB production.</p>

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Substituting spruce with larch, alder and birch in strand board manufacture

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月30日

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  • Tomáš Pipíška,
  • Pavlo Bekhta,
  • Jozef Ráheľ,
  • Marek Nociar,
  • Michal Šulák,
  • Pavel Král,
  • Roman Réh,
  • Rastislav Igaz,
  • Ľuboš Krišťák,
  • Miroslav Jopek

摘要

The composition of manufactured wood-based boards is influenced by variations in the availability of input materials caused by changes in forestry practice. The effect of substituting the ubiquitous Norway spruce (Picea abies L. Karst) was studied in manufacturing single-layer oriented-strand boards (OSBs) with larch (Larix decidua), alder (Alnus glutinosa (L.) Gaertn.) and birch (Betula pendula) at compositions of 10, 15 and 20%. The boards with 3% pMDI resin and 0.5% wax were made and their standard physical, mechanical and thermophysical properties were measured. Strands made from the broadleaf wood species (alder and birch) were wider than those from spruce, and lower wood density was associated with a higher slenderness ratio. The slenderness and flatness ratios of alder strands were 9.6% and 33.3% higher than those of spruce, 54.2% and 100.0% higher than those of larch, and 45.1% and 44.0% higher than those of birch. Substituting 10–20% of spruce strands with larch, alder, or birch improved the dimensional stability and mechanical properties of the boards. All boards met the EN 300 (for OSB/3) requirements for bending strength, internal bond strength, and thickness swelling, whereas modulus of elasticity values met the standard in all cases except for boards containing 15% alder. Alder and larch are the most suitable alternative species for replacing spruce. The higher internal bond strength observed in mixed-species boards indicates potential for reducing adhesive consumption in OSB production.