NEWS
NEWS
10
2022
-
06
How to choose and purchase wood-based panels
1、 What is the general size of wood board?
The standard size of wood board is generally 1220 by 2440 mm, and the commonly used thicknesses include 12 mm, 15 mm, 18 mm, and 20 mm. Woodboard refers to a kind of special plywood made by gluing and pressing, which is made of wood batten splicing or hollow board as the core board and covered with two or more layers of plywood on both sides.
2、 How to choose and purchase artificial panels?
1. Formaldehyde emission is an important indicator in wood-based panels. When consumers choose wood-based panels, they should try to choose panels with less irritating odor and lower formaldehyde emission. According to the national standards, the formaldehyde emission from panels is divided into four levels: ENF aldehyde free level: E0 level and E1 level can be directly used indoors; Class E2 must be finished before being used indoors. Therefore, consumers should pay attention to the formaldehyde emission level indicated by the manufacturer when purchasing.
2. Good wood-based panels should have a smooth and flat surface without blistering or delamination, with uniform thickness, no obvious warpage, and no defects around the edges. Formal production enterprises will mark the factory name, address, product implementation standard number, product grade, and formaldehyde emission level on the board. Consumers should try to purchase from a reputable building materials supermarket.
3、 What is the production method of artificial board?
1. Plywood is a board made of boiled and softened logs, which are peeled into large sheets, and then placed perpendicular to each other in the direction of the wood fibers. It is bonded with a synthetic resin adhesive with good water resistance, and then subjected to pressure, drying, sawing, and surface finishing. The number of layers is an odd number, usually 3-13 layers, respectively referred to as plywood, plywood, and so on. The tree species used to make plywood include basswood, birch, ash, beech, colored wood, eucalyptus, and so on.
2. Fiberboard is a board made from waste materials such as bark, shavings, and branches, which are crushed, soaked, and ground into wood pulp, then pressurized and dried. Due to different temperatures and pressures during molding, it can be divided into three types: hard, semi hard, and soft.
3. Particle board is a board made of wood shavings or wood fiber materials with or without glue. Particle board has small density and uniform material, but it is easy to absorb moisture and has low strength.
4. Blockboard is a kind of man-made board, which is made from the corner waste generated in the process of wood processing, through shaping, planing, sizing, splicing and veneering. The core of the board is generally made of sufficiently dry short wooden strips, and the surface of the board is made of single-layer thin wood or plywood. Blockboard is not only an effective measure for comprehensive utilization of wood, but also produces boards with uniform structure, stable size, large format, and large thickness. In addition to surface decoration, it can also be used as a construction material.
5. Other materials related to wood-based panel production: In addition to the logs required for plywood, most of the materials used for wood-based panels come from logging and processing residues, as well as small diameter wood (with a diameter of less than 8 centimeters). The sheet, strip, needle and granular materials made by crushing, chipping and re crushing can be used for manufacturing particle board. Wood chips are separated from fibers and used in fiberboard manufacturing. This can increase the utilization rate of wood by 20-25% compared to traditional utilization methods. In the 1970s, attention was paid to the use of bark and sawdust as raw materials for wood-based panels, but bark can only be used in the middle layer of particle board, and the amount should not exceed 8%, otherwise the product strength will be reduced. In addition, non wood materials have also received increasing attention, with the exception of bagasse, hemp stalks, and other materials that have already been used in the production of wood-based panels, and have been expanded to cover a variety of plant stems and seed husks.
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