Plywood, commonly known as plywood, is a three-layer or multi-layer (generally odd layer, 3-13 layers) plate-like material made of natural logs that are boiled and softened, and then spun into large sheets (veneers) with a thickness of more than 2.7mm-20mm along the growth rings. According to the principle of symmetry, plywood is generally composed of three or more layers of thin veneers with a thickness of 1mm, which are vertically aligned with each other according to the direction of adjacent layers of wood grain fibers, and then dried, assembled, glued, hot pressed and glued. The surface of high-quality products is flat and smooth, without degumming, sanding, crushing, obvious color difference and stain, with good dimensional processing accuracy, small thickness deviation, bonding strength of 0.7MPa and moisture content of 6-14%. Usually, it is mostly used as a base plate and also as a panel, which can be used in the manufacturing of buildings, interior decoration, furniture, shipbuilding, packaging and other industrial products.
To buy Plywood, first of all, look at environmental protection. It depends on whether the release of harmful gases meets the national standards, especially whether the free formaldehyde released by glue exceeds the standard. The vast majority of consumers may not know or determine these highly professional things. Therefore, it is a shortcut to see whether the manufacturer has China environmental label product certification. Because to pass the certification, we must take the quality and environmental protection as the premise.
Second, look at the materials. Different tree species have different prices. Consumers can choose different varieties of materials according to different needs. At present, the market is full of a large number of low-cost Eucalyptus core plywood. In fact, this is the surface coloring treatment of the poplar core board, so the appearance is basically the same as that of the willow Eucalyptus core board, but the quality is very different. In fact, the willow Eucalyptus core board is higher than the poplar core board in terms of weight, hardness and toughness. Consumers should carefully identify it when buying to avoid being cheated.
Again, look at the workmanship. Plywood plywood plywood has positive and negative differences. When purchasing plywood, the wood grain on the surface shall be clear, the front surface shall be smooth and smooth, the hand shall be flat without stagnation, and the back surface shall be at least not rough. It is better not to have scabs. Even if there are scabs, they should be flat, smooth and beautiful, which will not affect the construction and cause greater pollution. Therefore, when selecting the plywood, it is necessary to check whether there is degumming or glue scattering. You can knock each part of the plywood by hand. If the sound is crisp and uniform, it indicates that the quality is good. If the sound is dull and uneven, it indicates that the plywood has been glue scattering.
Finally, look at the appearance. When consumers buy and buy Plywood, they should see whether there are blisters, cracks, insect eyes, bumps, no marks, defects, and too large repair adhesive tape. Some plywood are made by sticking two veneers with different lines together. Therefore, in the selection, they should pay attention to whether the joint of the plywood is tight and whether there is uneven phenomenon. The appearance of furniture and doors and windows made of untidy and untidy plywood is very unsightly.
