MDF(HDF) Production Line

MDF(HDF)ProductionLine1MDF(HDF)ProductionLine2

MDF/HDF production line with annual output 15000～80000m3 can meet difference requirements and are favored and appraised by customers because it is unique and reasonable in technological arrangement, excellent in machine layout, advanced in control method, stable and reliable in quality of product and rapid in gaining the profit.
The line consists of chip preparation, fiber preparation, glue mixing and applying, mat-forming and hot-pressing, cooling and sizing, sanding.
1. This section consists of chipping, screening and chip storage, and it is used for providing acceptable chips for the refiner to grind the qualified pulp.
The wooden materials are turned into wood chips by drum chipper via live log belt conveyor. Chips form vibrating screen will be screened to remove fines, soil and stones and be moved metallic impurity via the belt conveyer with iron-separator. And then is transported into wet silo to buffer store.
Furthermore, the chip washing system can be added to this section according to the different materials and climate.
2. Fiber preparation section
Chips are transported to upper bin of refiner, and positively fed to digester by screw feeder for steaming. Steamed chips will be disintegrated to fiber under the force of heat and mechanism. Mix drying medium and wet fiber which is in the state of suspension with the help of high pressure air flow, and thus exhaust moisture in fiber via drying medium to get dry fiber. Dry fiber falls on belt conveyor through cyclone discharge valve, and then be transported to dry fiber bin for storage.
3. Glue mixing and applying section
Process of glue applying before drying is adopted. Feed molten paraffin and water-proof additive to refiner. Paraffin is mixed with fiber uniformly under the force of refiner plates. Glue is transported to the blow line of fiber discharge valve. With the help of 28-30m/s high speed air-flow, glue mist meets and attaches to the surface of fiber.
Fiber is struck by high-speed airflow in pipe dryer; the fiber in suspended state was dried in the process of conveying.
In order to prevent there is a fire in drying fiber process, the pipe dryer is attached to metering bin and fire extinguishing systems which can alarm automatically and put out a fire in time.
4. Mat-forming and hot-pressing section
Includes forming machine, prepress, sawing, conveying, hot-press and etc.
This section includes Mat-forming, prepress, sawing, conveying, hot-pressing and etc.
The fiber after drying is transported to the above of forming machine, and uniformly spread on the conveying mesh belt in the way of air-flow. Vacuum box equipped below the mesh belt provides negative pressure and air will be removed via mesh belt, fiber stays on mesh belt and thereafter forms mats gradually. Fluffy mats will be pressed by pre-press. Pressed mats are cut into definite length by longitudinal and transversal saw, then transported to loader passing through accelerating conveyor, storage conveyor and extension conveyor. When finishing loading mats, carriage in the loader will feed conveying belt and mats into hot press, at the same time, shovel head at the front end of conveying belt pushes out pressed board. When carriage comes to terminal, boards have been into unloader, and mats also arrives to due position. Carriage returns, conveying belt turns forward. Mats are in the relative still state and stay on the platen of press when velocity of conveying belt is the same as the returning speed of carriage. Glue in the mats cures, thanks to temperature and pressure in hot press, and hence boards with definite intensity and thickness form. Rough boards will be put on support via unloader. Outfeeding conveyor will unload boards one after another to next section when cage comes down.
5. Cooling and trimming section
This section mainly consists of board cooling, boarding trimming and cutting.
The temperature of the already pressed boards just leaving from the press is high; the cooling turner is arranged so that the rough boards can dwell to realize the nutural cooling treatment. Then the cooled board is processed by the longitudinal trimming and transversal cutting into the cut-to size boards. Thereafter stacked and stored for a period of time. The board will be next processed when the water distribution within the board is uniform and the temperature tends to air temperature.
6. sanding section
In order to achieve a least fluctuation in thinkness and a least unevenness of the surface, the MDF boards which trimmed and cooled must undergo sanding, after sanding, a tolerance in thickness can be realized.
After sanding, the MDF boards will be tested graded and pac