Plywood Definition, Plywood Types

Since wood has texture, cracking, warping and deformation will inevitably occur when the temperature and humidity change greatly. No matter what kind of wood is used in solid wood furniture and how well-crafted it is, these problems cannot be avoided. The wood-based panel is to decompose the wood into wood chips or wood pulp, and then make the board again. Because the original physical structure of wood is broken, the “deformation” of wood-based panels is much smaller than that of solid wood when the temperature and humidity change greatly. Therefore, it can be said that the quality of wood-based panels is more stable than that of solid wood.

For example, bent wood furniture is made by breaking the wood into narrow pieces, which are then glued and rolled. Bent wood can be bent at any angle and has good durability. In kitchen and bathroom furniture, moisture-proof artificial board is used, and after careful edge sealing and other processes, it can be used for a long time without deformation.

Furniture made of artificial boards is also called panel furniture. Although panel furniture is not easily deformed and has a variety of styles, the pollution caused by artificial panels to the living environment cannot be ignored. A few days ago, the State Environmental Protection Administration put forward environmental protection technical requirements for man-made panels. For the problem of free formaldehyde emission from wood-based panel products, the Environmental Standards Institute of China Academy of Environmental Sciences and the National Wood-based Panel Quality Supervision and Inspection Center are jointly responsible for drafting (technical requirements for low-formaldehyde wood-based panel environmental labeling products). Among them, the scope of pollutant discharge of production enterprises and products is limited, and the pollutant discharge of enterprises is required to meet the requirements of national or local pollutant discharge standards. The quality of wood-based panel products shall not only meet the requirements of their respective product quality standards, but also stipulate the content of halogenated hydrocarbons and benzene series in the adhesive used in the product should be less than 2000 mg/kg, and the amount of formaldehyde released in the product should be less than 0.2 parts per million. This requirement applies to man-made panels such as particleboard, plywood, blockboard, and composite panels.

In order to ensure the environmental protection of the living room, consumers should pay attention to whether strict edge sealing has been carried out when purchasing panel furniture, and at the same time, the six sides of panel furniture should be well sealed.

Blockboard (commonly known as large core board, wood board) is a plywood with a solid wood core. It cuts the logs into strips, splices into cores, and processes the outer veneer. The flexural and compressive strength is poor, but the transverse flexural and compressive strength is high. The surface material can be divided into 3-ply, 5-ply, etc. according to the number of layers, and can be divided into eucalyptus, beech, teak, etc. The board is divided into two types: one-sided light and two-sided light. The two-sided light board can be used as a decorative material for key parts such as furniture panels, door and window frames. Most of the blockboards on the market are solid, glued, double-sided sanding, and five-layer blockboards, with a size of 1220mm X 2440mm.

Characteristics of blockboard
Blockboard has good screw holding force, high strength, firm quality, sound absorption, heat insulation, etc., and the moisture content is not high, between 10% and 13%, easy to process and the most widely used.

Blockboard is more stable than solid wood board, but it is afraid of moisture, so attention should be paid to avoid using it in kitchen and bathroom during construction.

The processing technology of blockboard is divided into two types: machine-stitching and hand-stitching. Hand-made is to insert the wooden strips into the plywood manually. The extrusion force of the wooden strips is small, the splicing is uneven, the gap is large, and the nail holding force is poor. Such as the cushion wool board for solid wood floors. The machine-assembled plates are subject to large extrusion force, extremely small gaps, smooth splicing, uniform bearing capacity, long-term use, compact structure and not easy to deform.

According to the quality of the material and the texture of the surface material, Core board is divided into “superior products”, “first-class products” and “qualified products”. There are also companies that mark the sheet grades as A, double A and triple A, but this is just a corporate behavior, which is not in line with national standards. At present, this kind of marking is not allowed in the market.

There are many kinds of wood species of large core board, such as poplar, birch, pine, paulownia, etc. Among them, poplar and birch are the best, the texture is dense, the wood is not soft or hard, the nail holding force is strong, and it is not easy to deform. The texture is very light, soft, absorbs water greatly, has poor nail holding force, and is not easy to dry. During the use of the board, when the water evaporates, the board is easy to crack and deform. On the other hand, the hardwood is hard, not easy to be pressed, the splicing structure is not good, the nail holding force is poor, and the deformation coefficient is large.

Wood-based panels, as the name suggests, are panels made from the wastes from the edges and corners of wood during processing and mixed with other fibers. There are many types of wood-based panels, and commonly used decorative wood-based panels such as particleboard, medium density board, blockboard, plywood, and fireproof boards. Because they have different characteristics, they are used in different furniture manufacturing fields. Particleboard, which diversifies the specifications of furniture panels. Because particleboard has a relatively uniform structure and good processing performance, it can be processed into large-format boards as required, and is a better raw material for making furniture of different specifications and styles. The finished particleboard does not need to be dried again, can be used directly, and has good sound absorption and sound insulation properties. But it also has its inherent shortcomings, because the edges are rough and easy to absorb moisture, so the edge sealing process of furniture made of particleboard is particularly important. In addition, due to the large volume of particleboard, the furniture made of it is also heavier than other boards. MDF to improve the aesthetics of furniture. MDF is a kind of artificial board made of wood or plant fibers by mechanical separation and chemical treatment, mixed with adhesives and waterproofing agents, etc and then formed by high temperature and high pressure. It is used to make furniture. The ideal artificial board. The structure of MDF is more uniform than that of natural wood, and it also avoids problems such as decay and insects. At the same time, it has small expansion and shrinkage, which is easy to process. Due to the flat surface of MDF, it is easy to paste various finishes, which can make the finished furniture more beautiful in flexural strength and impact strength.

In terms of degree, they are better than particleboard. Various decorative wood-based panels for beautifying the home. The wood-based panels used for decoration are the products of ordinary wood-based panels that have been veneered for secondary processing. According to the veneer materials, there are natural wood veneer wood-based panels, plastic veneer wood-based panels, paper veneer wood-based panels and other types. Fireproof board, also known as “plastic veneer wood-based board”, has excellent wear resistance, flame retardant, easy cleaning and water resistance. This artificial board is a good material for table top, kitchen furniture and bathroom furniture. Paper veneer wood-based panel is a special paper veneer material with wood grain or other patterns attached to the surface of wood-based panel. Its various surface properties are slightly worse than that of plastic veneer wood-based panels, such as polaroid panels and gorgeous panels.

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