The melamine faced chipboard is a kind of composite material belonging to new-type building decoration materials, can also be called as particle board, which is an engineered wood product manufactured from wood chips, sawmill shavings, or even saw dust, and a synthetic resin or other suitable binder, which is pressed and extruded.
Melamine chipboard's raw material is fed into a disc chipper with between four and sixteen radially arranged blades, and it is produced by mixing wood particles or flakes together with a resin and forming the mix into a board. When the resin is in liquid form, it is then sprayed through nozzles onto the particles. And it is said that melamine is an important organic chemical intermediate products, mainly used to produce melamine resin, have excellent water resistance, heat resistance, arc resistance, and excellent fire retardant. Surface uses melamine and has flatness high, abrasion-resisting. The chipboards are first dried, after which any oversized or undersized particles are screened out.
There are several types of resins which have been widely used, including Amino, formaldehyde based resins, Urea Melamine resins, Phenol formaldehyde and Melamine Urea phenolic formaldehyde resins. The first kind of resins is the best performing when considering cost and ease of use; Urea Melamine resins are used to offer water resistance with increased melamine offering enhanced resistance; Phenol formaldehyde is typically used where the panel is used in external applications due to the increased water resistance offered by phenolic resins and also the color of the resin resulting in a darker panel; Melamine Urea phenolic formaldehyde resins exist as a compromise. Melamine formaldehyde resin is a thermosetting polymer. Transparent fireproof coating for wood based on melamine-formaldehyde resin as raw materials has good decorating property and fireproof property as well. To enhance the panel properties even further the use of resorcinol resins typically mixed with phenolic resins are used, but this is usually used with plywood for marine applications and a rare occasion in panel production.
When the resin is mixed with the melamine faced chipboard, the liquid mixture is made into a sheet. A weighing device notes the weight of flakes, and they are distributed into position by rotating rakes. In graded-density particleboard, the flakes are spread by an air jet that throws finer particles further than coarse ones. Two such jets, reversed, allow the particles to build up from fine to coarse and back to fine.
The sheets formed are then cold-compressed to reduce their thickness and make them easier to transport. Later, they are compressed again, under pressures between two and three megapascals and temperatures between 140 degrees Celsius and 220 degrees Celsius. This process sets and hardens the glue. All aspects of this entire process must be carefully controlled to ensure the correct size, density and consistency of the board. Finally, the boards are then cooled, trimmed and sanded. They can then be sold as raw board or surface improved through the addition of a wood veneer or laminate surface.