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<p>Oriented strand board (OSB) is an important engineered wood product manufactured through bonding of wood strands in cross-oriented layers. Vertical density profile (VDP) is one of the key factors determining both physical and mechanical properties of OSB. To understand the formation of VDP, VDP of the mattress was monitored by recording the position of strands during the hot-pressing. Three types of boards were manufactured in the lab in terms of different hot-pressing curves, namely board a (pressed at 1.5&#xa0;MPa and 3.5&#xa0;MPa), board b (pressed at 3.5&#xa0;MPa without pre-heating), and board c (pressed at 3.5&#xa0;MPa with 3&#xa0;min pre-heating). It finds that the actual and predicted densities are significantly similar (<i>R</i> &gt; 0.8). Boards a and b have conventional M-shaped VDP, while VDP of board c is more uniform. For all three types of boards, as increasing pressure, density of the top and bottom layers instantly increases, while the density increase in core layer is slow. The density curve in core layer could be fluctuating, especially in board a and it tends to be smoother with decreasing pressure. Density in each layer of the board decreases with decreasing pressure, especially in boards a and b. The VDP mainly affects MOE and MOR of the boards in major axis. Board b has the highest MOE and MOR, while board c has the lowest MOE and MOR. Board c owns the highest IB strength and the lowest 24&#xa0;h thickness swelling. Understanding the VDP formation would contribute to optimizing the production and application of OSB.</p>

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In-situ investigation of the VDP formation of oriented strand board

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Wanzhao Li,
  • Yunfeng Shi,
  • Jipeng Zhou,
  • Changtong Mei

摘要

Oriented strand board (OSB) is an important engineered wood product manufactured through bonding of wood strands in cross-oriented layers. Vertical density profile (VDP) is one of the key factors determining both physical and mechanical properties of OSB. To understand the formation of VDP, VDP of the mattress was monitored by recording the position of strands during the hot-pressing. Three types of boards were manufactured in the lab in terms of different hot-pressing curves, namely board a (pressed at 1.5 MPa and 3.5 MPa), board b (pressed at 3.5 MPa without pre-heating), and board c (pressed at 3.5 MPa with 3 min pre-heating). It finds that the actual and predicted densities are significantly similar (R > 0.8). Boards a and b have conventional M-shaped VDP, while VDP of board c is more uniform. For all three types of boards, as increasing pressure, density of the top and bottom layers instantly increases, while the density increase in core layer is slow. The density curve in core layer could be fluctuating, especially in board a and it tends to be smoother with decreasing pressure. Density in each layer of the board decreases with decreasing pressure, especially in boards a and b. The VDP mainly affects MOE and MOR of the boards in major axis. Board b has the highest MOE and MOR, while board c has the lowest MOE and MOR. Board c owns the highest IB strength and the lowest 24 h thickness swelling. Understanding the VDP formation would contribute to optimizing the production and application of OSB.