The large core board, also known as blockboard, is one of the main materials for home decoration. Its core is made of natural wood strips with a wooden skin on top and bottom. Consumers generally only see the appearance of the large core board, and perhaps feel that the big core board of the brand or the brand is not much different on the surface. So, how to identify the quality of the large core board? It is not difficult, as long as you master the four characteristics of the large core board - flatness, symmetry, stability and environmental protection, you can buy high quality board.
1. Flatness: the appearance should be smooth and smooth
Whether the quality of the large core board is acceptable or not, the most intuitive inspection method is to look at its appearance. The outermost layer of the large core board is a single board, and the quality of the single board is 0.35 mm or more. Generally, the veneers produced by regular manufacturers are double-sided sanded, the appearance is flat, the board surface is smooth, and the surface has no obvious color difference. The inferior large core board is not well produced due to the production process, and the surface is often rough, with burrs and unevenness.
Reminder: When checking the flatness, the consumer should touch it with his hand. The stronger the smoothness, the more the surface treatment of the board is in place.
2. Symmetry: core board wood strip stitching should be well-proportioned
Whether the large core board is strong and durable is the material and process of the third core board. When purchasing, it is also important to observe the structure of the large core from the side. Shen Liming, general manager of Nanning Flagship Store, Dehua Bunny Decoration New Materials Co., Ltd. introduced that when you get a large core board, you should carefully observe the side structure, especially the composite wood strip of the core. The core board of the large core board in the market is mostly fir, and the proportion of the core board produced by the regular manufacturer is even, and the width of the single piece is about 5 cm. When consumers purchase, in addition to checking the width of the core board, it is also necessary to check whether the two core boards are closely spliced ​​and there are no obvious gaps.
Inferior large core board is not tightly stitched and the gap is obvious. In order to cover up this defect, some manufacturers fill the gap of the wooden strip with materials such as putty and gypsum powder. Consumers can view the side of the large core board. If there is any glue or greasy putty, it may indicate that there may be gaps or voids inside.
Reminder: If the merchant allows, the consumer can saw a corner of the large core board and observe the structure of the internal wood core. Small wood strips that are spliced ​​in the middle cannot use wood with bark, boring and dead knots. The core board with better quality and the connection between the wood strips is very dense.
3. Stability: the thicker the plate, the more stable the plate
The large core board can be divided into three layers of core board, middle board and panel from the inside to the outside. The second layer of the large core board is usually called the middle board, which mainly functions to stabilize the core board, so the thicker the middle board, the better the stability of the large core board. The middle plate of the upper plate is thin, which tends to cause insufficient bending resistance of the large core plate, and the thickness of the middle plate of the lower plate is suitable.
Since the large core board is a multi-layer structure, the quality of each layer of material will affect the overall quality. In order to save costs, the large core plates produced by some small manufacturers are very thin, which results in insufficient bending resistance of the large core plates. Such a large core board is easily split from the gap of the two core sheets if it is bent hard. In addition, many merchants sell stacks of plates when stacked. When consumers choose large core boards, they can first look at the side of each sheet in the stack of sheets to see if the thickness of the sheets is consistent. If the thickness is basically the same, it means that the processing quality of the sheet metal is high and the quality is guaranteed.
Reminder: to identify the quality of the large core board, you can also tap the surface of the board to listen to the difference in sound. If the sound changes, there is a hole inside the board. The overall strength of such a plate is weak, and uneven long-term stress may cause distortion and deformation of the plate structure, affecting the appearance and use.
4. Environmental protection: environmental protection sheet grade
The large core board uses glue when the core board is spliced ​​and the core and the surface board are glued, so that free formaldehyde is released more or less. When the free formaldehyde content exceeds a certain range, it will affect human health. Therefore, the main difference between environmentally friendly blockboard and inferior blockboard is the quality of the glue. Experts said that because consumers can not verify on-site whether the formaldehyde emission of the large core board exceeds the standard, it can smell the smell of the board and make a preliminary judgment on the environmental protection of the large core board. If the glue used is environmentally friendly, the large core board has only a dry woody taste and does not smell the pungent formaldehyde. If the large core board emits a pungent odor, the amount of formaldehyde released is high. In addition, consumers should not only pay attention to the large core samples provided by the merchants, but also smell the other plates stacked in the store. Because the sample may be stored for a long time, the odor has been exhausted, so consumers should smell close to the piles, especially the large core plate pressed in the middle, whether there is a pungent smell.
Reminder: Verify that the large core board is environmentally friendly, and check the environmental rating of the board or test report. The large core board is divided into E0 grade, E1 grade and E2 grade according to environmental protection standards. The formaldehyde emission of E0 grade large core board is ≤0.5 mg/L, the emission of E1 grade formaldehyde is ≤1.5 mg/L, and the emission of E2 grade formaldehyde is ≤5. Mg/L. Among them, the E2 grade large core board has poor environmental performance and cannot be directly used for interior decoration. Consumers should pay attention to distinguish when purchasing.
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