What is the standard of plywood?
1. What is plywood?
Plywood is a new type of man-made board. As the name implies, it consists of a surface plate and an inner plate. These plate-like materials are bonded into a whole by wood adhesives. It is a rational use of log residues, a more environmentally friendly and fashionable practice, which helps us to save wood resources and make better use of wood resources. Generally speaking, it has three or more layers, mostly odd layers. After modern fine processing, the physical and mechanical properties of the plate have been greatly improved. The increase of plywood specifications makes it more suitable for furniture manufacturing and construction, and even can be well used in other industries, such as shipbuilding and aircraft.
Second, plywood standards
In plywood production, machine splicing has become the development direction of the industry.
The transaction target GB/T5849 is widely implemented in the industry with a high degree of standardization. Formaldehyde emission
The formaldehyde emission of indoor boards can be divided into three grades: E0, E 1 and E2. E0 grade ≤ 0.5mg/L, E 1 ≤ 1.5 mg/L, E2 ≤ 5mg/L ... The quality standard of plywood futures delivery follows the national standard system, and the formaldehyde emission should reach the grade of E1,with the allowable range ≤1.5mg/. Similarly, the E2 level is given a large discount, and participation in delivery is generally discouraged.
(2) Other inspection indexes mainly include appearance, specification, moisture content, transverse static bending strength, immersion peeling performance, surface adhesion and strength.
Three, plywood classification
1. Veneer plywood: This kind of plywood is mainly used for furniture, sewing machine bedplates, various electrical appliances shells and other products whose surfaces need to be painted with transparent paint.
2. Decorative plywood: This kind of plywood is mainly used as decorative materials for buildings, furniture, vehicles and ships.
3. Ordinary plywood: This kind of plywood is suitable for packaging, padding and other purposes.
4. Veneer decorative plywood: This kind of plywood is mainly used as high-grade decorative materials for buildings, furniture, vehicles and ships.
Four, plywood standard specifications
The length and width of plywood are generally 1220×2440mm, and the thickness is 3, 5, 9, 12, 15, 18mm, etc. The main tree species are Cinnamomum camphora, Salix, Poplar and Eucalyptus. The main producing areas of plywood are Indonesia and Malaysia.
These are the main factors that determine the price of plywood. Here is a brief talk about the price of general plywood. V. The price of plywood
Generally, plywood with a slightly more expensive price is a product with high environmental protection grade, relatively thick and good material, and the price will reach three or four hundred yuan; The plywood with a slightly lower price is about one or two hundred, which is also the price of most plywood; The price of slightly cheaper plywood is generally around 70 to 100 yuan.
The price of the plywood above is only about 80 yuan, and it belongs to poplar board, with a thickness of 12 mm and a grade of E2. This is cheaper plywood. The brand of this product also belongs to the general brand.
The above model is plywood with a thickness of 18 mm, which is E 1 grade superior plywood. It is a natural environmental protection product with a special quality inspection report.
This kind of plywood costs more than 200 yuan. Six, plywood procurement points
People should not only consider the specifications of plywood for building and the thickness of plywood for other purposes, but also consider its environmental protection, which is the focus of shopping. Because the veneer is bonded by adhesive in the production process, a large amount of adhesive is used, which is easy to volatilize formaldehyde and other gases harmful to human health.
To this end, we must pay attention to the edge sealing treatment of plates when purchasing. Only by perfecting the details of edge sealing can the release of formaldehyde be reduced. From the perspective of durability, we should pay attention to whether there is loose glue on plywood. If you knock on every corner and center of the board by hand and hear a dull sound, it means that there is loose glue in the middle of the board, which means that the quality is not up to standard. Now the application of plywood is more and more extensive. Suitable for making all kinds of furniture and wood products. Beautiful and generous, excellent stability. Choose the appropriate plywood specifications according to your own needs when purchasing. Of course, health problems must be considered. Therefore, we should pay attention to the quality of the board and try to choose more environmentally friendly plywood.