One、How to assemble the connecting board
The "finger joint" board is constructed by joining multiple wooden planks. Unlike traditional edge-glued and clamped boards, the vertical wooden planks utilize a saw-tooth-like interface, similar to fingers interlocked, hence the name "finger joint" board. There are two types of finger joint construction: open-tooth and concealed-tooth. Concealed-tooth joints are preferred because open-tooth joints are more prone to unevenness after painting. However, concealed-tooth joints are more difficult to fabricate. Harder wood is preferable, as it experiences less deformation and has a more aesthetically pleasing grain.
II. Production Process for Jointing Boards
The production process for joining boards involves several steps, from raw material processing to the final product leaving the factory, including: cutting raw timber – creating board strips – entering a specialized drying and modification equipment – quality inspection based on different colors and defects – initial planing – creating grooves – joining boards – drying – sanding – filling gaps – final sanding. The specific steps are as follows.
1、The wood is processed into panel materials: the logs are cut into panels using band saws, main saws, etc.
2、Drying of Plywood: This process primarily involves steaming to remove moisture and oils (mainly pine oil) from the wood. Due to the tendency of small-dimension lumber to crack and warp, drying and dewatering reduces the thickness and eliminates cracks.
3、Panel Processing: After drying, the panels are processed by double-sided sanding or planing, followed by edge trimming using a multi-blade saw to cut the sanded panels into strips.
4、Material Selection and Cutting: Sort the cut wood pieces to select those that are free of defects, such as knots, cracks, and sapwood. Then, cut the selected pieces into lengths of 200-700 millimeters.
5、Jointing: The prepared wooden strips are sieved and then joined together using adhesive.
6. Plane all four sides: Plane the joined wooden strips to create uniform square edges.
7、Laminated Board: The specified dimensioned strips are pressed into the desired board material using a press.
8、Leveling and Sanding: Level and sand the pressed boards to achieve the desired thickness.
9. Repair, clean, and pack.
The production of finger joints requires a strict and regulated manufacturing process. It is essential to avoid any shortcuts, omissions, or reductions in the manufacturing process, otherwise the finger joints produced will inevitably be of poor quality.