Veneered wood-based panels, also known as decorative veneer veneer panels. It is a board made of the surface of a wood-based board such as a plywood, a medium-density fiberboard, a blockboard, a particleboard, or the like, which is usually coated with a common wood veneer, a color veneer, an integrated veneer, and a composite veneer. It is made of hot pressing, sanding and other processes. It is one of the main varieties of wood-based panels for decoration and decoration. It has the characteristics of beautiful appearance, uniform color and uniform texture. It has the decoration and decoration "face reputation". Mainly used for decoration of furniture, cabinet doors, window sleeves, floors and wall skirts.
In general, the veneer refers to a veneer plywood, which is a plate made of a decorative veneer glued to a plywood substrate. It usually consists of decorative panels and plywood. Decorative table refers to the surface layer material, which is divided into natural wood veneer and recombinant wood veneer. The main tree species are teak, black walnut, hard maple, ash, oak, rosewood, striped ebony, red walnut, tree shadow, Dozens of varieties such as eucalyptus, Cyclobalanopsis, Birch, and Cherry; plywood substrates can be divided into three, five, and five layers according to different purposes, including poplar core board, Liuan core board, birch core board, and beech core board As well as other miscellaneous wood core boards, different core or core materials have different qualities, which is one of the factors that distinguish the quality of veneer plywood.
Key indicators
1. Formaldehyde release limit. According to the national standard GB/T 15104-2006, the formaldehyde release limit index of veneer plywood and veneer blockboard is E0 grade ≤0.5mg/L, E1 grade ≤1.5mg/L, E2 grade ≤5.0mg/L. According to the results of national supervision and spot check and provincial supervision and inspection in recent years, there are still unqualified veneers in the production and circulation market where the formaldehyde emission index exceeds the standard or is inconsistent with the explicit one. First, the formaldehyde emission exceeds the standard, which constitutes harm to human health or The second party is that the formaldehyde emission of some products is not in line with the actual level. For example, the product is rated as E1, but the product is actually E2 or even higher than the E2 level. There is a bad behavior of low level and high level, but this also Belongs to non-conforming product.
2. Dip peel test. This index reflects the ability of the veneer products to withstand the peeling deformation or the degree of peeling due to the stress caused by the swelling and shrinkage of the veneer, and is also an indicator for evaluating the gluing performance of each adhesive layer of the product. The main reasons for the failure of this index are: first, the quality of the substrate used for veneer is poor, there are glue defects; second, the process setting is unreasonable during the secondary production process of the veneer; third, the coating material on the surface of the substrate is thick. , affecting the surface bonding performance.
3. Surface bonding strength. This performance index is an important characteristic index of the veneer, reflecting the maximum tensile force per unit area between the surface veneer and the surface of the substrate, that is, the bonding strength. It is mainly related to the three process parameters of “time, temperature and pressure†when pressing. In addition to the amount of adhesive used and usage, it is also related to the amount of concealer used, and also affects the formaldehyde emission index.
4. Water content. The water content is a quality index reflecting the dryness of the veneer product. The moisture content is too high, and deformation, cracking or mildew is likely to occur during use. If the moisture content is too low, deformation warping may occur during use, and in severe cases, the product may be affected. use.
Shopping tips
1. Ask, smell. Asked about the level of formaldehyde emission and the scope of application of veneer veneer. The level of formaldehyde emission on the market is confusing. There are nominal “E0â€, “E1â€, “E2†or “greenâ€, etc. Different environmental protection grades have prices. The difference; "smell" can initially determine the level of formaldehyde emission, such as the smell of irritating, indicating that the amount of formaldehyde emission is high, such plate formaldehyde may exceed the standard, it is not recommended to buy.
2. Visual inspection of the appearance. The surface of the veneer can be visually evaluated for its processing quality or process. The surface is required to be smooth and smooth, free of burrs, indentations, and slits. In particular, side viewing cannot produce defects such as degumming, delamination, partial overlap, or off-core. The surface decorative veneer requires uniform color and pattern, no splicing or obvious digging marks. The wood material is normal, no decay, discoloration, etc.
3. Size. Ordinary veneer plywood format is usually 2440mm × 1200mm, thickness is 2.5mm, 2.7mm, 3.0mm, 3.5mm, 5.0mm, etc., should pay attention to whether the thickness is consistent with the nominal thickness. In addition, the feel should be flat and the whole board needs to be firm. The fine veneer plywood is processed, and the surface feels smooth and dry through strict processing technology; the corners are straight and firm, indicating that the material is good and there are few defects in the decoration.
4. Measure the bonding performance.
5. Check the production license number and authoritative report and other information.
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