¶ 1. Why does plywood bend?
The main reason for plywood bending is that humidity changes cause the wood to expand due to moisture absorption or shrink due to drying. When the two sides of the plywood absorb or release moisture unevenly, internal stress imbalance will occur, resulting in bending. Uneven humidity is usually caused by the following reasons:
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One side is exposed to high humidity or close to a moisture source, while the other side is in a drier environment;
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Under storage conditions, the two sides are in contact with different environments (such as one side is close to the ground).
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Due to the characteristics of wood texture, coating treatment, etc., even if the humidity is the same, there may be differences in the rate of moisture absorption, which increases the possibility of bending.
¶ 2. How to avoid the bending of plywood?
Please store it in a closed environment with stable humidity to reduce the chance of direct contact with changes in air humidity, thus effectively avoiding the occurrence of bending. For example, plywood can be properly stored in a sealed ziplock bag to ensure its good condition**.
¶ 3. The plywood has been bent, how to restore it?
If the plywood is bent, you can try to fix it by following the steps below:
- Slightly humidify: Use a humidifier or spray bottle to lightly spray a small amount of water mist on both sides of the plywood to evenly increase the humidity.
- Flattening: Place the bent plywood with the convex side facing up on a smooth and flat surface, and apply a suitable amount of weight on top to flatten the board. Let it sit for a while until the board returns to flatness after the weight is removed.
- Natural drying: After the surface moisture evaporates naturally, it can be resumed for normal use.
¶ End Notes
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