What is plywood?

Plywood, commonly known as plywood, is a natural log. After cooking and softening, the log is cut into large pieces (veneers) along the annual rings. According to the principle of symmetry, three or more thin veneers with the thickness of 1 mm are generally assembled vertically in the direction of wood grain fibers of adjacent layers, and then dried, patched, glued, hot pressed and glued to make three or more layers (usually odd layers, 3-650 layers). High-quality products are smooth, without degumming, sand loss and breakage, with obvious color difference and stains, good dimensional processing accuracy, small thickness deviation, adhesive strength of 0.7Mpa, and water content of 6- 14%. Usually used as substrates and panels, it can be used for industrial products such as architecture, interior decoration, furniture manufacturing, shipbuilding and packaging. \x0d\ Buy plywood. First look at environmental protection. It depends on whether the amount of harmful gases released meets the national standards, especially whether the free formaldehyde released by glue exceeds the standard. For these professional things, the vast majority of consumers may be unclear and uncertain, so it is a shortcut to see whether the manufacturer has China environmental label product certification. Because to pass this certification, quality and environmental protection must be the premise. \x0d\ Second, look at the materials. Different tree species have different prices. Consumers can choose different kinds of materials according to different needs. At present, the market is flooded with a large number of low-priced eucalyptus core plywood. In fact, this is the surface coloring treatment of poplar core board, so the appearance is basically the same as that of eucalyptus core board, but the quality is far from it. In fact, eucalyptus core board is higher in weight, hardness and toughness than poplar core board, so consumers should carefully identify it when buying to avoid being fooled. \x0d\ Again, it depends on the workmanship. Plywood plywood is divided into positive and negative. When purchasing, the plywood surface should have clear wood grain, smooth front, flat and not sluggish, at least the back is not rough. It is best not to have scars, even if there are, they should be smooth and beautiful, which will not affect the construction and will cause greater pollution. Therefore, when selecting, it depends on whether there is degumming or not. You can tap all parts of plywood with your hands. If the sound is crisp and even, it proves that the quality is good. If the sound is stuffy and uneven, it means that the plywood is loose. \x0d\ Finally, look at the appearance. When purchasing, consumers should see clearly whether each plywood has bubbles, cracks, bug eyes, bumps, no marks, defects, too many repair tapes and so on. Some plywood is made by sticking two veneers with different lines together, so pay attention to whether the flat-fell seam of plywood is tight and uneven when choosing. Furniture, doors and windows made of untidy plywood are not beautiful.