In the production of particleboard, cold pressing and hot pressing are performed. Some small manufacturers and small workshops will omit the hot pressing treatment in order to reduce the cost input, which will easily cause the produced particleboard to crack. Tell you about the hot pressing process:

1. Appropriate temperature

Excessive temperature will not only decompose the urea-formaldehyde resin, but also cause the slab to partially solidify in advance and produce waste products when the temperature is raised.

2. Appropriate hot pressing pressure

Pressure can affect the contact area between the shavings, the deviation in sheet thickness, and the extent of rubber transfer between the shavings. According to the different density requirements of the product, the hot pressing pressure is generally 1.2 ～ 1.4 MPa.

3. Appropriate moisture content

When the moisture 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 slab bubbling and delamination during pressure release. The moisture content of the core layer should be lower than that of the surface layer to maintain proper plane tensile strength.