[ Chinese wardrobe net ] The particle board is made of logs and then processed by high temperature and high pressure. The middle layer of the particle board is wood chips, and the two sides are finely organized wood chips, which are pressed into plates. The surface layer is in the form of a powder layer, and the homogenized particle board is the best. The molecular structure of the particle board is tight and the bending strength is high. The particle board has the advantages of being not easily deformed and having strong nail holding power. The disadvantage of particleboard is that it is not easy to be bent or curved, which requires high processing machinery.
The MDF is made of plant wood fiber as the main raw material, and is processed by hot grinding, paving, hot pressing and the like. It features uniform internal structure, good machinability, easy engraving and various parts and shapes. MDF (450-780) generally has a good surface flatness, so when the surface needs to be boring and forming, and the pasting surface is a softer material (such as a blister board), the MDF is used to ensure the film is covered. flat surface. Therefore, it is generally used for laminate flooring, door panels, and the like.
Moisture resistance: MDF is formed by pressing wood powder, and the surface is flat. Therefore, when the surface needs to be boring and forming, and the surface is softer (such as blister board), medium density is often used. The plate is used to ensure that the surface of the film is flat. However, since the raw materials are all very fine wood powder, if the particle board is immersed in water due to the moisture-proof property, the wood fiber is long in the particle board, and the structure of the wood is more retained, so the particle board will not expand until it expands to a certain extent. (8%-10%). Therefore, the comprehensive performance of moisture resistance can be said that the particle board is superior to the density board. Therefore, European and American furniture kitchen cabinet companies do not have a more common use of MDF for the box material has a certain reason.
Environmental protection: Recently, almost all furniture and kitchen cabinets in Europe and America use particleboard. For example, Germany's prestigious BERLONIROSSI and S-BEKA use particleboard. Several large domestic factories use a full set of imported equipment (investment of more than 200 million yuan). It can also produce particleboard with tight molecular structure and high flexural strength. Generally speaking, if the surface decoration surface is imported from Germany, most of them are produced by large factories, and are used for high-grade furniture, buyers and suppliers pay more attention to market reputation, so there are fewer problems. However, there are some small domestic factories that can only produce some common white light board and eucalyptus board. Due to the backward equipment and production process, the produced boards are poor in bearing capacity, bending resistance and deformation strength. It is easy to loosen afterwards, and the fastening strength is insufficient after loosening, and it expands rapidly after encountering water. And the formaldehyde content is extremely high, dozens of times higher than the national standard, which is very harmful to the human body. It is the quality of this type of sheet that tarnishes the reputation of particleboard and makes consumers mistakenly believe that the quality of particleboard is inferior. The MDF has not been in the history for a long time, and the original trees are getting scarcer, so a plate is needed instead. Therefore, there is a MDF, but because of the large amount of glue used in the MDF production process, if the quality of these glues is not good, or the instability will cause the MDF to be too high, the MDF mainly detects the formaldehyde emission and structural strength, and the density. The plate is divided into E1 grade and E2 grade according to the formaldehyde emission amount, and the formaldehyde emission amount exceeds 30mg/100g. In general, most of the MDFs of the upper-scale manufacturers are qualified. Most of the MDF on the market is E2 grade, and E1 grade is less. On the whole, the environmental protection factor of particleboard is much higher than that of MDF. Moreover, MDF is mostly used for door panels or for styling, and is not practical for cabinets.
Nailability: The MDF is composed of powder and is easily swelled when exposed to water. Therefore, it is impossible to make the box, and because of its poor nailing, in general, the MDF hits the surface and pulls it out again. This can't be repeated 5 times, and it can't be used. However, the particle board is made of wood chips, which are pressed into a board, which has the characteristics of wood and has a certain nail holding force. Under normal circumstances, it can be repeated about 10 times.
Compressiveness: The middle layer of the particle board is wood long fiber, and the two sides are finely organized wood fiber, which is pressed into a board. The molecular structure is tight and the bending strength is high. We have done the same experiment using the same thickness and density of MDF and particle board with the same weight of 50 kg, after 2 months, the MDF is severely deformed, and the particle board is slightly deformed). Due to its high hardness, strong nail holding ability and good lateral load-bearing capacity, particleboard is suitable for the connection between cabinets and laminates. At present, all cabinets in Europe and America use particleboard. The well-known cabinets in China also use particleboard as the cabinet. . The density board is suitable for the door panel because of its uniform density. Some brands make the cabinets all made of particleboard or MDF, which is unscientific and can be easily deformed after a long time.
In addition to the above factors affecting the quality of the board, in fact, the following points affect the board in the processing of the board:
*Keyword 1: Electronic cutting saw. Large-scale specialized enterprises use electronic cutting saws to input the processing size through the computer, and the computer controls the size accuracy of the material selection, and can process 4 sheets at a time. The dimensional accuracy of the board with stable performance is very high, the tolerance unit is in the micrometer, and there is no collapse at the edge of the board. The small workshops have small manual cutting saws and even woodworking saws. The plate size error caused by this simple device is often larger than 1 mm, and the collapse phenomenon often occurs, and the plate substrate is exposed.
*Keyword 2: Heavy-duty edge banding machine. The edge of the high-quality cabinet is smooth, smooth and feels good, the edge is flat and smooth, and the joint is fine. The professional manufacturer completes all the processes at one time with a straight edge banding machine, and the precision of the machining dimensions can be adjusted to the most suitable position to ensure the most accurate size. The workshop-style small factory is to manually complete the above procedures. Due to uneven coating, the resulting edge is uneven, the line is undulating, and even has a sense of hand. Due to the uneven pressure, many places are not strong, and it is easy to open and fall off in a short time. Once the edge is removed, water ingress and expansion will occur. A large amount of toxic gases such as formaldehyde volatilize into the air, causing harm to the human body.
*Keyword 3: 32-hole CNC center. Today's panel furniture requires a lot of positioning holes on the board. The fit and precision of the hole position will affect the structural robustness of the cabinet. The professional large-scale factory uses 32-module drilling. These holes are controlled by the numerical control center. One hole and one hole on the board surface are completed at one time. These holes are all the same positioning reference, so the size of the hole is matched. The accuracy is guaranteed. Handmade small factories use row drills, even ** drill holes. Due to the different positioning errors, the accuracy of the matching accuracy of the hole position is very large. In the process of box assembly, even the hole position is not matched, so that the combined box is not a regular square, but is distorted. of.
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