Wood TV stand-Particleboard Craft

The production method of particleboard is divided into the flat pressing method of intermittent production and the extrusion method and rolling method of continuous production according to the different slab forming and hot pressing process equipment. In actual production, the flat pressing method is mainly used. Hot pressing is a key process in the production of particleboard. Its function is to solidify the rubber in the slab and consolidate the loose slab into a board of specified thickness after pressurization. The process requirements are: ① Appropriate moisture content. When the moisture content of the surface layer is 18-20%, it is beneficial to improve the flexural strength, tensile strength and surface finish, and reduce the possibility of bubbling and delamination of the slab during pressure relief. The moisture content of the core layer should be properly lower than that of the surface layer to maintain proper plane tensile strength. ② Appropriate hot pressing pressure. The pressure can affect the contact area between the shavings, the thickness deviation of the board and the degree of glue transfer between the shavings. According to the different density requirements of the product, the hot pressing pressure is generally 1.2-1.4 MPa. ③Appropriate temperature. If the temperature is too high, the urea-formaldehyde resin will not only be decomposed, but also partly solidified in advance when the temperature rises, resulting in waste products. ④ Appropriate pressurization time. If the time is too short, the resin in the middle layer cannot be fully cured, the elastic recovery of the finished product in the thickness direction is increased, and the plane tensile strength is significantly reduced. The hot-pressed particleboard should be subjected to a period of humidity control to make the moisture content reach a balanced state, then sawed, sanded, and inspected for packaging. However, after the pressure is relieved, it cannot be stacked in a hot state, otherwise the brittleness of the plate will be increased. Molding technology refers to the technology of forming products in one operation. There are 3 mature crafts. The thermal molding method can use less or no rubber material, relying on the activation and flow of lignin in the closed thermal mold to form the glue, but it needs to be cooled and demoulded, the heat consumption is large, and the productivity is low, so it has been gradually eliminated. The box forming method is to pressurize with a special press, and press it once to make a product, which is used to make a packaging box. The thermoforming method mainly manufactures furniture accessories, interior decoration accessories, pallets and other products. The adhesive is mainly urea-formaldehyde resin. In addition, there is also a planar molding method that uses a template to press the surface of the particleboard that has been made, or on the formed slab that has not been hot-pressed, to make a relief pattern, etc.