The raw material of MDF is made by separating wood into fibers, and chipping is an important step in the process. It mainly cuts loose wood into chips that meet the production specifications in order to provide better conditions for fiber separation.
Hot grinding
The wood chips cut in the chipping workshop are preheated and cooked, and the fibers are mechanically separated. The quality of the thermal grinding process determines the quality of the MDF product. Therefore, the production line with advanced thermal mill is a necessary condition to improve the quality of the MDF. Southeast Wood has introduced advanced thermal mills such as Andrec and Simbelkamp to ensure that the fiber quality industry leads.
Fiber drying
Heat-milled fibers and sizing make the fiber moisture content reach 40 to 50%. If the fibers are difficult to adapt to the subsequent sections without drying, the drying temperature is mainly controlled at about 165 ° C in this process section. It will not cause resin pre-curing, which will affect the static bending (MOR) and drawing (IB) of the board, and other mechanical properties.
Paving
The laying process is to store the fibers in the fiber silo for a period of time after drying, and then use a vacuum fan to realize the rough forming of the fibers through a feeding fan, and then use a sweeping roller and a pre-press to realize the bad plate forming process.
Hot pressing
Hot pressing is an important process in the production of MDF, which plays a decisive role in product quality and output. It is the combined action of heat and pressure, which vaporizes the moisture in the slab, evaporates, increases density, redistributes the adhesive and waterproof agent, and causes a series of changes in the components of the raw material to form various bonds between the fibers. The process of making the product meet and meet the quality requirements.
Sewage treatment
The dry production of MDF is basically free of a large amount of industrial wastewater, mainly some cork water extruded from the feeding screw. The general production line for this type of wastewater is usually treated by anaerobic method. The process flow diagram is as follows: workshop wastewater-> preliminary sedimentation-> water collection sedimentation tank-> anaerobic tank-> air flotation tank-> SBR tank-> clear tank > Fibre transitioner-> Drain.