Full analysis of finger joint and splicing technology in the production of solid wood furniture

Full analysis of finger joint and splicing technology in the production of solid wood furniture

Reading Guide: whether it refers to material splicing or panel splicing, it is only the difference of panel splicing process. In fact, it is all solid wood panels. Moreover, the panel and finger joint materials are more solid and stable than large-size solid wood parts. However, the texture of the tooth joint material along the length direction is interrupted, and the wood grain is not smooth enough. The texture of the panel is smooth, but there is often a color difference between the two adjacent panels. Our ideal “solid wood furniture” is best processed from a whole board of logs, and the surface is coated with a layer of varnish. But in fact, there are many great knowledge in the production process ~ there will be boils, mildew, decay in the natural growth of wood, which is not conducive to the guarantee of processing quality. Wooden knots can be divided into dead knots and loose knots. Loose knot: there is a complete texture connection with the surrounding structure, no fracture, no medullary core structure. Dead knot: circular or semi-circular separation with the surrounding structure, easy to shrink and leak after drying. Loose knots are common in American painting, and many customers of exported products need such effects. The sense of deadlock is slightly worse, but it does not affect the use. In the processing of solid wood plates, splicing and finger joint are generally used to remove the knots, moldy and decayed parts. This effectively reduces the use of some material defects. The ends of wood are connected by fingers, while the joints along the grain and along the grain are spliced. When fingering, the end of the wood should be processed into a tooth shape and then connected to increase the bonding force. Finger joint is divided into open finger and implicit finger, and the exposed tooth shape after assembling the whole plate is the open finger; The tooth shape covered by later splicing is implied. The production process of finger jointed wood is different from that of other boards (wood board, density board, particleboard, multilayer board). It does not use urea formaldehyde glue with high formaldehyde content, but uses more environmentally friendly panel glue, and the amount of glue used is also less. This also determines that laminated materials are more environmentally friendly than other plates. In general, the strength of good finger joint material is not inferior to that of straight joint material, and the wood stress is small, which is not easy to deform and bend. If selected, some defects of straight joint material, such as dead knots, large knots, spots, etc., can be avoided. Of course, this should be based on the good finger joint technology. If the material selection of straight timber is good, it is certainly not bad, but the utilization rate of timber is low. Of course, the appearance of direct splicing material is better than that of finger jointing material, especially if the end customer doesn’t understand the strength, he will feel that the finger jointing material is connected with some poor materials, which can’t bear much power. But in fact, the finger jointed laminated timber with good physical and mechanical properties has stable wood properties, and its strength is 1 ~ 1.5 times that of natural solid wood. Panel and finger joint materials are more solid and stable than large-size solid wood parts. They are very ideal panels for solid wood furniture. For solid wood furniture products made of furniture, the wood used is pure natural wood, and there are many wood scars. If the finger joint and splicing process is not carried out, the wood scars cannot be removed, which affects the beauty of furniture. Therefore, the finger joint and splicing technology of solid wood furniture can not only highlight the natural attributes of solid wood furniture in the production process, but also provide necessary conditions for protecting the environment and saving costs. Moreover, observing the finger joint and splicing process has become an identification method to identify solid wood furniture. Finger joint board is a solid wood board made by splicing multiple boards, which does not stick to the plywood up and down, so it uses little glue in production, and the material is more environmentally friendly. More and more people like it. The vertical wood boards adopt sawtooth interfaces, which is similar to the shape of cross docking of two fingers, so it is called finger joint board. Finger board is an environmental friendly board. Its texture looks very natural, giving people a feeling of returning to nature. There is no need to paste plywood up and down the structure finger joint plate, and the amount of glue is greatly reduced. The glue used for the finger board is generally milky white glue, that is, the aqueous solution of polyvinyl acetate. It is water as a flux, non-toxic and tasteless. Even if it is decomposed, it is also acetic acid, non-toxic. There are also two kinds of finger joint plates: knot and non knot. Those with knots have scar holes, and those without knots have no scar holes, which is more beautiful. Some decorators directly use finger joint plates to make furniture, and there is no need to stick decorative panels on the surface, which is stylish and saves money. The simple way to identify the quality of the finger joint board is to look at the core material ring: the finger joint board is mostly Chinese fir, and the ring is obvious. The larger the ring is, the longer the tree age is, the better the material is. There is also a kind of camphor wood finger board on the market, which is used to make the shelf of the wardrobe, which can repel insects. With this board, camphor balls can no longer be put in the wardrobe, and the price is more expensive. The finger joint plate is divided into exposed teeth and concealed teeth, and the concealed teeth are the best, because the exposed teeth are prone to unevenness after painting, of course, the processing of concealed teeth is more difficult. The harder the wood, the better, because its deformation is much smaller, and the pattern will be more beautiful. The production process refers to a series of processes, such as small-diameter material as the production raw material, cutting into plates through logs, drying the plates, making plates into square strips, breaking materials, selecting materials, pointing, splicing, subsequent treatment, etc., to make wood with a certain width, thickness and length. It is a new type of base material used in the construction industry, furniture and decoration industry. Specific production process: (1) log processing into plate stage: that is, the log is cut into plate by band saw. (2) Board drying: mainly through fumigation to dry out the moisture and oil in the wood. (3) Plate square processing: after drying, the plate is planed by double-sided plane, flat plane and pressure plane. Plane both sides, and then cut the planed plate into strips through multiple saws. (4) Material selection and cutting: select the cut wood strips and cut them into a length of less than 200-700 mm without lack of material, blue deformation, cracking and scar knot. (5) Finger joint: connect the made wooden strips into strips with adhesive after thinning teeth. (6) Planing on four sides: after planing on four sides, the connected wooden strips are planed into neat square strips. (7) Plate splicing: press the standard square bar into the required plate through the press. (8) Planing and sanding: Press, planing and sanding the pressed plate to the required thickness. (9) Repair, tidy and package. Does it refer to connecting wood or solid wood plate? Answer: of course! Solid wood finger joint is also called laminated wood. Laminated wood does not change the structure and characteristics of wood. It is still a natural substrate like wood. However, in terms of physical and mechanical properties, it is better than solid wood in tensile and compressive strength, and better than solid wood in the homogenization of material quality. Therefore, laminated wood can replace solid wood and be used in various corresponding fields. 1. Finger joint board type finger joint board is also divided into two types: jointed and non jointed. The jointed finger joint board has scar holes, while the non jointed finger joint board does not have scar holes, which looks more beautiful. Therefore, some people directly use finger joint board to make furniture without any decorative panels on its surface, which not only has personality, but also saves money and kills two birds with one stone. 2. One way to distinguish the finger joint board is to look at its core material ring: the finger joint board is mostly made of fir, and the ring is more obvious. The larger the ring is, the longer the tree age is, and the better the material of the finger joint board is. Another way is to look at the tooth marks: the finger joint plate is usually divided into open teeth and dark teeth, of which the dark tooth finger joint plate is the best, because the open tooth finger joint plate is prone to some unevenness after painting, of course, the processing of dark teeth is more difficult. The harder the wood is, the better the quality of the finger joint plate is, because its deformation is much smaller than that of ordinary plates, and the pattern is also more beautiful. 3. Advantages of finger board 1. The surface of finger board is generally painted with clear water paint, and the environmental protection effect of paint sealing is relatively good, which can basically reach E0 level, so the furniture made of finger board is more environmentally friendly and healthy. 2. Finger boards are relatively cheap in the market at present. Compared with some good wood boards, finger boards are not much expensive. 4. Disadvantages of finger board 1. Finger board furniture is not real traditional solid wood furniture, but flat wood furniture, so finger board does not have the durability of traditional solid wood furniture. 2. Finger boards are generally used in growing forests. These wood species are generally pine and cypress, which are not very good. And the air drying process is generally not very long, the water content is relatively large, easy to deform and crack. 3. Finger boards commonly used in modern life are divided into single-layer finger boards and three-layer finger boards. In terms of deformation resistance, the three-layer fingerboard is naturally much stronger than the single-layer fingerboard. What is finger joint material? Finger jointed wood, also known as tooth jointed wood or laminated wood, is a wood panel technology that appears only after the development of industrial machinery to a certain stage. Use mechanical equipment to mill the cut wood teeth, and then apply glue for splicing. Tooth like bite marks can be seen at the splicing, which is a process of length splicing. To put it bluntly, short and small boards are used to splice long boards. Natural environmental protection is the biggest advantage of solid wood furniture. Compared with those wood-based panel furniture, the amount of glue used in the processing of solid wood furniture is quite small. The amount of glue used affects the environmental protection of furniture. Moreover, solid wood furniture is made of natural wood, which is more environmentally friendly. The core board is made of wood with small anisotropy, and the surface of the board is uneven and warped to a small extent. The upper and lower sides are covered with two thick planked veneers, which can better eliminate the warping, cracking and deformation of the board surface, and improve the physical strength of the board in all directions. Planing thick veneer is made of selected large-diameter grade superior logs, which are strictly selected according to texture and color, using high-precision equipment and scientific planing methods. Such processing technology has a very good sense of integrity in terms of texture and color. After painting, the texture is more prominent. The furniture produced creates a harmonious and high-end sense of value. What is jigsaw board? Splicing refers to the plate whose length is made of whole materials and spliced from the width direction, which is usually described as horizontal splicing. The advantages of the panel are that the wood grain is coherent, there is no interruption, the visual effect is good, and the overall appearance of the finished product is beautiful. At present, the furniture components that use more panels are generally table tops, cabinet doors, ground cabinet tops, tea tables and other high-end furniture. Splicing refers to the plate whose length is made of whole materials and spliced from the width direction, which is usually described as horizontal splicing. The advantages of the panel are that the wood grain is coherent, there is no interruption, the visual effect is good, and the overall appearance of the finished product is beautiful; Its shortcomings are also obvious, first of all, low yield and high cost; Secondly, the stability is in direct proportion to the length. The longer the plate is, the easier it is to warp and deform. At the same time, the finished products have higher requirements for the use environment. Panel is a material with obvious advantages and disadvantages. The best way to use it is to achieve a balance between cost, aesthetics and stability. Before the emergence of the toothed splicing machine, there was no finger joint material in the market, and there was almost no better solution to the length splicing of wood. Frame plate assembly or beam bridge structure were mostly used to meet the length requirements. Although it is also a solution, it limits the design of furniture types. There are transitional horizontal wooden strips or waistlines in the middle of this kind of furniture. It is the emergence of toothed joint boards that makes it possible for furniture styles to blossom, so toothed joint boards are very important to the development of furniture industry. There were also attempts in the industry to use the splicing process to lengthen wood. Because the splicing process could not bite, it was difficult to improve the strength of the board anyway. It was difficult to meet the standards in physical and mechanical tests such as bending, compression and shear resistance, and finally gave up the use, while the toothed splicing performed very well. Comparison between the automatic panel splicing machine and the old process: 1. Save 10% wood: take the production of 9mm (full 9mm) finished fingerboard as an example. In the previous conventional panel splicing machine, the raw material must be 11mm thick (dry material) to meet the sanding requirements, and this machine only needs 10mm thick dry material. To produce 17mm (full 17mm) thick finished boards, the old process requires 20mm thick dry materials, and the machine only needs 18mm (dry materials) raw materials to meet the sanding requirements. 2. Save four side saw operation process: reduce two four side saw operators. 3. After the process is reduced, no waste leftovers will be generated. 4. Processing speed: produce one piece of 1220 every 1.5 minutes × 2440 board. The technological process of four sided saw is deleted. The machine has cut the four sides of the wood board neatly in the process of panel splicing, so the four sided saw is no longer needed for processing, which directly reduces the investment cost. Reduce floor space: save a lot of floor space for manual jigger and quadrilateral sawing equipment. Save human resources, high production speed and materials. It is concluded that whether it refers to material splicing or panel splicing, it is only the difference of panel splicing process, which is actually solid wood panel. Moreover, the panel and finger joint materials are more solid and stable than large-size solid wood parts. However, the texture of the tooth joint material along the length direction is interrupted, and the wood grain is not smooth enough. The texture of the panel is smooth, but there is often a color difference between the two adjacent panels. The color difference problem of all solid wood furniture is natural and can be ignored. Only by using the covering technology can the color difference be infinitely reduced, but the furniture made by this technology does not belong to all solid wood furniture, but belongs to the category of solid wood covered furniture (also known as solid wood veneered furniture); There is another kind of use of paint finishing, completely covering up the wood can also make the color difference disappear, but there is no natural wood grain on the surface of the furniture. This kind of furniture is adopted according to the characteristics of the style. European and Korean furniture are often seen, and the appearance is very beautiful, which does not affect the material of the solid wood itself. It can be completely compared from the interior of the furniture, whether it is made of all solid wood. Therefore, for all kinds of solid wood furniture, we need a rational understanding

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