The finger joint board is a type of wood panel made by joining multiple wood boards together. Unlike traditional wooden boards, the upper and lower surfaces are not covered with splints. Instead, vertical wooden boards are connected using a zigzag-shaped joint, which resembles the interlocking of two fingers—hence the name "finger joint board."
This type of board is widely used in furniture making and construction, just like regular wood panels. However, it requires significantly less adhesive during production, making it a more eco-friendly option compared to standard wood boards. As a result, more people are choosing finger joint boards over traditional wood boards for their environmental benefits. The common thicknesses available include 12mm, 14mm, 16mm, 20mm, and even up to 36mm for thicker applications.
One of the key advantages of finger joint boards is that they don’t require splints on either side, and the amount of glue used is much lower. The adhesive typically used is white glue, or polyvinyl acetate emulsion, which is water-based, non-toxic, and odorless. Even when it breaks down, it only releases acetic acid, which is harmless.
Finger joint boards can be categorized into two types: those with knots and those without. Boards without knots are generally more visually appealing. Some installers prefer to use finger joint boards directly for furniture, as they don’t need to be veneered or covered with additional panels. This makes them both stylish and cost-effective.
To assess the quality of a finger joint board, one effective method is to examine the core material’s annual rings. Most finger joint boards are made from fir, and the annual rings are clearly visible. Larger rings usually indicate older, better-quality wood.
In addition to fir, there are also eucalyptus finger joint boards available on the market. These are often used for wardrobe shelves and have natural anti-moth properties, eliminating the need for mothballs. However, these boards tend to be more expensive and are not commonly found in most home improvement stores.
Finger joint boards come in two varieties: bright teeth and dark teeth. Dark teeth are considered the best because they are less likely to show unevenness after painting. However, producing dark teeth is more challenging due to the complexity of the cutting process. Harder woods are preferred for finger joints because they are less prone to warping and offer a more attractive grain pattern.
One major difference between finger joint boards and solid wood boards is that finger joint boards are made from solid wood, while wood boards are typically made from composite materials. This gives finger joint boards a natural texture and a more authentic feel, bringing a sense of nature into any space.
When it comes to environmental friendliness, the main factor is the amount of formaldehyde released. Both finger joint boards and wood boards can be classified as E1 grade (emitting less than 1.5mg/L of formaldehyde), which means they are equally environmentally friendly. However, since finger joint boards use less glue, they are generally easier to control in terms of emissions. Wood boards, on the other hand, often have splints, which can also release formaldehyde. You can easily tell the difference between the two by looking at the joints—finger joint boards have clean, smooth edges, while wood boards may have visible splints.
The manufacturing process of finger joint boards involves several steps: cutting logs into short pieces, slicing them into slats, drying and modifying them in special equipment, sorting by color and imperfections, preliminary planing, cutting, long-edge joining, further drying, sanding, and finishing. By cutting the wood into different shapes and recombining them in a specific way, the board’s properties such as anisotropy, heterogeneity, and dimensional stability are improved. Boards made from larger units tend to have higher mechanical strength, while those made from smaller units offer better uniformity.
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