Specification for materials of solid wood furniture
In terms of the materials used for solid wood furniture, there are strict and detailed requirements. When a product is clearly labeled as all-rosewood furniture, all parts of the product must be made of rosewood, except for the backing board on the back of the mirror, which is a special case. This regulation ensures the purity of all-rosewood furniture, allowing consumers to truly enjoy the quality and beauty brought by the rosewood material. Rosewood itself has unique textures and excellent qualities. Using it in furniture production can enhance the overall value and artistic sense of the furniture.
For products clearly labeled as rosewood furniture, the external components must be made of rosewood solid wood. This is because the external components directly affect the appearance and quality of the furniture, and using rosewood can showcase the high - end and elegant nature of the furniture. The components inside the product, on the back, and in concealed areas can be made of solid wood from other tree species. Such regulations not only take into account the overall aesthetics of the furniture but also reasonably utilize resources to a certain extent and reduce production costs.
For double-encased framed furniture, the textures of the tree species used on its exterior should be similar. There should be no obvious differences in the tree species of the same glued and spliced parts, which can ensure the consistency and aesthetics of the furniture's exterior. Softwoods and hardwoods shall not be used together to ensure the structural stability and durability of the furniture. The tree species of the plywood used on the exterior should be the same, but there are no restrictions on the tree species used inside. This regulation ensures the quality of the furniture's exterior while providing a certain degree of flexibility in the choice of internal materials.
Requirements for wood moisture content
The moisture content of wood is a crucial indicator in the quality of wooden furniture. The standard stipulates that the moisture content of wood should meet the annual average equilibrium moisture content of wood in the region where the product is located plus W1%. For the region where the product is located, when inspecting the product, the annual average equilibrium moisture content of wood in this region plus W1% shall be used as the standard value for determination. If the distribution unit has other requirements for the moisture content of wood when ordering products, it shall be clearly stated in the purchase contract.
China has a vast territory, and there is a significant gap in the annual average equilibrium moisture content of wood between the South and the North. Even in the same region, the moisture content of wood varies greatly between the rainy and dry seasons, as well as between winter and summer. For example, the climate in the South is humid, so the moisture content of wood is relatively high; while the climate in the North is dry, and the moisture content of wood is relatively low. If the moisture content of wood does not meet the requirements of the region where it is located, problems such as deformation and cracking may occur in furniture, which will affect the service life and aesthetics of the furniture.
Technical requirements for particleboard and medium density fiberboard
There are strict regulations on the free formaldehyde emission of particleboard. The formaldehyde emission of every 100g of particleboard shall not exceed 50mg. Formaldehyde is a substance harmful to the human body. Strictly controlling the formaldehyde emission of particleboard can ensure the health of consumers.
The technical requirements for medium-density fiberboard are more detailed. In terms of its physical performance indicators, the moisture content at the time of delivery should be 4% - 13%. An appropriate moisture content can ensure the stability of medium-density fiberboard. The average density of each board shall not exceed ±10% of the nominal density, which can ensure the uniform quality of the board. The thickness swelling rate after water absorption shall not exceed 12%. This indicator reflects the board's anti-deformation ability in a humid environment. Regarding the formaldehyde emission inside the board, the total extractable formaldehyde in every 100 g of the board shall not exceed 70 mg, which is also to safeguard the health of consumers.
Regulations related to furniture dimensions
Furniture dimensions are divided into three types: design dimensions, limit deviation dimensions, and shape and position tolerance dimensions. Design dimensions refer to the dimensions marked on the product drawings, such as the overall dimensions of the product in terms of height, width, and depth. The main dimensions, which are also the functional dimensions of the product, refer to the design dimensions of a certain part of the product, and must meet the dimensional requirements for this part stipulated by the standards. For example, inside a wardrobe, the standard stipulates that the clear depth should be ≥ 530 mm, and the design dimensions must meet this requirement to ensure the functionality of the wardrobe.
The limit deviation dimension refers to the difference between the measured value obtained by measuring the actual product and the designed dimension of the product. The standard stipulates that the limit deviation for non - foldable products is ±5 mm, and for foldable products, it is ±6 mm. This regulation can ensure that the actual size of the product conforms to the designed size within a reasonable range.
Geometric and positional tolerance dimensions include eight items such as warpage, flatness, perpendicularity of adjacent sides, position difference, drawer swing, sagging, unevenness of the product's feet on the ground, and joint gaps. Warpage refers to the overall flatness of the surface of the product (component). When the diagonal length L of the front panel is less than 700 mm, the allowable difference should be ≤ 1 mm. Flatness refers to the local flatness of the product (component) surface within the range of 0 - 150 mm, and the unevenness should be ≤ 0.2 mm. Perpendicularity of adjacent sides refers to the non - rectangular degree when the outer shape of the product (component) is rectangular. The allowable difference in measuring the two diagonal lengths L is stipulated according to the different lengths of the frame diagonals. Position difference refers to the distance between two adjacent surfaces of the door and the frame, door and door, door and drawer, drawer and frame, and drawer and drawer in the product. The allowable deviation of the distance between the adjacent surfaces of the door and the frame, and door and door should be ≤ 2 mm, and the allowable deviation of the distance between the adjacent surfaces of the drawer and the frame, drawer and door, and drawer and drawer should be ≤ 1 mm. Drawer swing and sagging refer to the matching accuracy between the drawer and the frame. When the drawer is pulled out by 2/3 of its depth, the swing should be ≤ 15 mm and the sagging should be ≤ 20 mm. Unevenness of the product's feet on the ground refers to the stability when the product's feet touch the ground, and the unevenness should be ≤ 2 mm. Joint gaps refer to the matching gaps between the external opening and closing components of the product and the frame. The maximum joint gaps shall not exceed 2 mm and 1.5 mm. These regulations can ensure that the shape and position of the furniture meet the standard requirements and improve the usability and aesthetics of the furniture.