Common quality problems of blockboard and precauti

2022-07-22
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There are many places where Blockboard is used in interior decoration, but like other wood-based panels, glue is required in the production process, so the amount of use affects the formaldehyde emission after decoration

there are many places where Blockboard is used in indoor decoration, but like other wood-based panels, glue is required in the production process, so the amount of use affects the formaldehyde emission after decoration. In addition, the production investment of blockboard is not high. There are many brands selling Blockboard on the market, and what quality problems Blockboard will have. Therefore, you must carefully understand the purchase and purchase of blockboard. Next, the Millennium boat board editor will take you to understand the common quality problems of blockboard and the purchase precautions:

first, what is Blockboard:

Blockboard is commonly known as big core board, blockboard, It is made by gluing two pieces of veneer in the middle. After heat treatment (i.e. drying in the drying room), it is processed into a certain specification of solid wood short lath, which is spliced into the middle board manually or by a panel splicing machine. Then two layers of high-quality veneer are covered on both sides of the spliced board, and then glued by cold and hot presses

Blockboard produced by Millennium boat, one of the top ten brands of board, is the best in the industry. It is made of high-quality Southern fir, poplar and Tung wood, the surface and bottom plate are overlaid with oguman, and the core plate is made of soft broad-leaved wood with uniform structure and small dry shrinkage, which is glued and pressed with natural environmental friendly adhesive. The product has the characteristics of good flatness, small color difference, light weight, not easy to deform, environmental protection up to E0 level, and can be widely used in indoor decoration and furniture production

II. Common problems of blockboard

1. Moisture content: the control of moisture content should be compatible with the balanced moisture content of the use environment. Blockboard that fails to meet this index is prone to warpage and deformation in use

the moisture content of blockboard is a factor to distinguish the quality of blockboard. The moisture content of many BLOCKBOARDS does not meet the national standards, which is also one of the common problems of blockboard. The moisture content of the blockboard is generally 6% to 12%. If the moisture content exceeds the standard, it is not only easy to cause the deformation of the blockboard, but also affect the appearance of the product, resulting in the loss of the cross-sectional compressive capacity of the product. The main culprits of the excessive moisture content of the blockboard are the insufficient curing time of the wood blank and core board, and the defects in the control of the hot pressing process

2. Transverse static bending strength: transverse static bending strength is an important technical index to measure the bearing capacity of blockboard. Blockboard that fails this index is easy to break in use

blockboard, as a structural decorative material in the field of home decoration, has high performance requirements for quality. Among them, the transverse bending strength of blockboard is one of the indicators to consider the quality of blockboard. The higher the transverse bending strength, the greater the bending bearing capacity of blockboard and the less easy it is to deform. The common problems of blockboard with poor quality include easy deformation, easy folding, etc., while Blockboard with good quality can evenly distribute the force and ensure that it will not be dragged down and bent in the future

3. Surface bonding strength: this index reflects the firmness of the surface board and the core board. Blockboard that fails this index is easy to warp (commonly known as peeling) in use

4: bonding strength. This index reflects the structural stability and resistance of blockboard, and the ability of moisture to open glue. Blockboard that fails this index is easy to open glue in use. At the same time, it is also an important indicator to test a manufacturer's production process, whether there are problems such as Jerry building and cutting materials

5. Formaldehyde emission. This indicator is an environmental protection indicator widely valued by all walks of life. Blockboard that fails to meet this indicator is easy to cause adverse stimulation to human body in use

I believe everyone knows the harm of formaldehyde to human body, so the large amount of formaldehyde emission is also one of the common problems of blockboard. As consumers, when purchasing blockboard, we need to check the quality inspection report of blockboard before buying. The report can affect the formaldehyde emission of blockboard, including the type of glue, the proportion standard and the free formaldehyde index, so try to buy Blockboard with low pollution value

III. precautions for purchase

the surface of blockboard should be flat, without warpage, deformation, blistering and depression; The core strips are arranged evenly and neatly, with small gaps, and the core strips are free of decay, fracture, wormhole, knot scar, etc. Some joinery boards cut corners, and the gap of solid wood strips is large. If nails are nailed at the gap, there is basically no nail holding force. When consumers choose, they can look at the sun, and the gap of the solid wood strip will be white. If the gluing strength of blockboard is not good, one of them will be responsible for its own profits and losses, and there will be a "squeak" sound of glue opening. If the big core board emits a fragrant wood odor, it indicates that the formaldehyde emission is less; If the smell is pungent, it indicates that there is a large amount of formaldehyde emission

the quality of blockboard varies greatly, so it should be carefully checked when purchasing. First, check whether the core material is dense, whether there are obvious seams and rotten wood strips, and whether there are obvious seams and rotten wood strips. There may be insect eggs in the rotten wood strips, which are easy to be eaten in the future; Then look around to see whether there is glue and putty filling, which is generally to make up for internal cracks or holes; Then, knock the surface of the plate with a sharp beak, and listen to whether the sound is very different. If the sound changes, it indicates that there is a hole in the plate. These phenomena will weaken the overall bearing capacity of the plate, and the long-term uneven stress will distort and deform the plate structure, affecting the appearance and use effect

IV. types of blockboard

1. According to the national environmental protection standard for free formaldehyde emission of man-made boards, blockboard on the market has three grades: E0, E1 and E2, which are respectively as follows:

e0 ≤ 0.5mg/l, which is the best grade of environmental protection and the European standard agreed by larger board manufacturers

e1 ≤ 1.5mg/l, which is the highest standard in the national standard, and can be directly used with the green environmental protection standard of indoor decoration

e2 ≤ 5mg/l, generally used for outdoor decoration, cannot be directly used with indoor decoration

formaldehyde is listed as carcinogenic and harmful by the World Health Organization, so we should pay attention to the environmental protection level of the plate when selecting the plate. The higher the level of the plate, the less harm it will do to the human body, and even there will be no harm to the human body

2. In the national standard of blockboard GBT 5849-2006 blockboard, the appearance quality of material defects and processing defects of blockboard panels has three grades: excellent products, first-class products and qualified products. What we often see in the product labels on the market are the manufacturer's grade labels: such as fine selection, township type, engineering type, etc

3. Blockboard specifications are generally 1220mm wide, 2440 long, and 9mm, 12mm, 15mm, 17mm, 18mm, 20mm, 25mm thick. 12mm and 18mm are commonly used thicknesses; According to the number of layers, there are three, five and multi-layer BLOCKBOARDS

4. The medium board of blockboard is made of solid wood short battens. According to different splicing methods, it can be divided into manual splicing and machine-made splicing. Generally speaking, the strength of machine-made splicing is strong and uniform, the gap is small, and the board core is more solid. In addition, there are also two kinds of panels: glue panel and non glue panel

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