Particleboard Characteristic and Manufacturing Technology
Particleboard particleboard, also known as particulate board and bagasse board, is made of wood or other wood cellulose materials, which are adhesively bonded to wood-based panels under the action of heat and pressure after the application of adhesives. Also known as scrap board. Mainly used in furniture and construction industry, train and car manufacturing. Particleboard is divided into three types according to product density: low density (0.25-0.45g/cm 3), medium density (0.55-0.70g/cm 3) and high density (0.75-1.3g/cm 3). Particleboard with 0.65-0.75g/cm 3 density is usually produced. According to the slab structure, it can be divided into single layer, three layers (including multi-layers) and gradient structure. According to water resistance, it can be divided into indoor water resistance and outdoor water resistance. According to the arrangement of particles in the slab, there are two types: directional type and random type. In addition, there are Particleboard Made of non-wood materials such as cotton stalk, hemp stalk, bagasse, rice husk, and cement wood silk board and cement particleboard made of inorganic adhesive materials. Particleboard has many specifications, the thickness is from 1.6 to 75 mm, and the standard thickness is 19 mm. The commonly used thickness is 13, 16 and 19 mm.
_as the basis for evaluating the quality of particleboard and the main performance considered in its use, it has density, moisture content, water absorption, thickness expansion rate and so on in physical properties; static bending strength, vertical surface tensile strength (internal bonding strength), nail holding force, elastic modulus and rigid modulus in mechanical properties; machinability, cementability, paint coating, etc. in technological properties. Ornamental and so on. Particleboard for special purposes should also be used for different purposes, taking into account its electrical, acoustic, thermal and anti-corrosion, fire and flame retardant properties. The production methods of particleboard are divided into flat pressing method, extrusion method and roll pressing method according to the different forming and hot pressing process equipment of particleboard. Flat pressing is intermittent production, while extrusion and roll pressing are continuous production. Flat pressing method is the main method in actual production.
_particleboard is a thin sheet made of wood chips as the main raw material, glue added and additives pressed. Pressing methods can be divided into two categories: extruded particleboard and flat particleboard. The main advantage of this kind of sheet is that the price is extremely cheap. Its shortcomings are also obvious: the strength is very poor. Generally, it is not suitable to make larger or powerful private goods.
_Particleboard is made by crushing various branches and buds into granules and then bonding them under high pressure. It is called particleboard because its profile is similar to honeycomb shape. Nowadays, most panel furniture in the world choose this kind of board. The advantage is that the interior is granular with crossed and scattered structure, so it has good nail holding force, good lateral bearing capacity, and lower cost than MDB. Although the content of formaldehyde is higher than MDB, it is much lower than large core board. The price is relatively cheap (according to the difference of decoration import and domestic and thickness, the price of each piece is 60 to 160 yuan). Unequal).
_ Usage surface is often double-sided pressed with trihydroammonia finish, after edge-sealing treatment, the appearance of medium density board is the same.