① Appropriate moisture content. When the water content of the surface layer is 18-20%, it is beneficial to improve the bending 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 appropriately lower than that of the skin layer to maintain proper in-plane tensile strength.
②Appropriate hot pressing pressure. Pressure can affect the contact area between the shavings, the thickness deviation of the board and the degree of transfer of glue between the shavings. According to the different density requirements of the product, the hot pressing pressure is generally 1.2 to 1.4 MPa.
③ appropriate temperature. Excessive temperature will not only decompose the urea-formaldehyde resin, but also cause the slab to be partially cured in advance when the temperature is raised, 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 increases, and the plane tensile strength decreases significantly. The hot-pressed particleboard should be subjected to a period of humidity adjustment treatment to make the moisture content reach a balanced state, and then sawed and sanded to inspect the packaging.
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