Plywood is formed by hot pressing of multi-layer wood veneer or sheet glue of about 1 mm. Commonly there are plywood, penta-plywood, seven-plywood, and eleven-plywood. The plywood has the characteristics of good structural strength, good stability, and is mainly used for floors of decorative panels, back panels of panel furniture, and the like. The classification of plywood:
Type A plywood
is weather resistant, boiling water resistant plywood, high temperature resistance, steam treatment and other advantages;
Type B plywood
is a water-resistant plywood that can be impregnated in cold water and impregnated with hot water for a short time;
Types C plywood
are moisture-resistant plywood, which can be impregnated in cold water for a short time and is suitable for use at room temperature. Used for furniture and general construction purposes;
Types D plywood
are non-moisture-resistant plywood, which can be used under indoor normal conditions. The general-purpose plywood materials include beech, eucalyptus, ash, birch, eucalyptus, and poplar.
Choose plywood should pay attention to the following aspects:
1. There are differences between the front and back of the splint. When choose plywood, the plywood should have clear wood grain, smooth front surface,no roughness, and it should be smooth without any feeling of lag; when purchasing multiple plywood, plywood with wood grain and similar color should be selected.
2.The plywood should not have defects such as breakage, bumps, hard injuries, gangues, etc., and should be free from decompose;
3. No degumming of plywood;
4. Some plywood is made by different veneer mixed . Therefore, attention should be paid to the plywood patch joint where there is no unevenness.
5. When selecting plywood, should be taken to choose plywood that do not loosen. If the hand taps on all parts of the plywood, the sound is brittle, which proves that the quality is good. If the sound is boring, it means that the splint has appeared to be loose.
6. Choose environmentally friendly plywood, pay attention to the amount of formaldehyde released. Should buy high-quality, environmentally-friendly or brand plywood.
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