فارسی
Русский
العربية
The process of making MDF
MDF
The process of making MDF from raw materials of wood generally includes peeling, crushing, separating and washing, adding resins or waxes and other ingredients (cake forming), drying, hot pressing, soldering, sanding, cutting and closing The bundle
.
MDF (Medium Density Fiberboard)
MDF is called Medium Density Fiberboard, which is earthenware and is produced by using glue, wax, or resin in sheet and under pressure and heat. MDF, unlike chipboard and fiber, and a few layers of wood fiber particles While chipboard and multi-layer fibers from wood and glue fibers are produced under pressure and heat. In the MDF industry, we can also use Bagasse or Nashgar pellets.
Dry wood fibers are used to make MDFs. These fibers are produced using ordinary atmospheric reffers and atmospheric pressurized water vaporizers. These equipment will be able to use a variety of wastes, so that after cutting and cutting the wood and peeling the wood is completely crushed and For sorting, they are shipped to the sieve, and then directed to the storage silos and placed under the baking and steaming operation and sent to the Riffiner machine.
MDF is one of the most expensive building materials that is more durable than solid wood.
chopping
To accelerate the feeding of the original raw material uniformly and homogeneously, it is necessary that the wood be converted into small pieces of wood in order to make it easier for the baking part to produce fibers. The result of this process is not to produce healthy and uncut fibers and The rapid penetration of water vapor into the wood makes transporting it easier. The most important part of this continuous operation is the length, width and thickness of the particleboard. The most common type of wood crushing machine is a disc type that is equipped with rotary vertical blade grinding wheels
.
Wash the crushed wood
In order to maintain and prolong the life of disc mills, all impurities associated with chips must be separated in necessary ways. These impurities, which are particles of gravel and pebbles and metals, were washed with water by iodine prior to the transfer of wood to the steam and mill.
Slicing and grading wood chips
In order to smoothly and uniformly cut wood particles and reduce their heterogeneity, it is necessary to use a sieve system to make small pieces of wood that are prepared to be directed to the cooking and production of fibers. In this section, the wood particles can be Types larger than the required limit (return to the eaters), the usual limit and smaller than usual. The most commonly used vibrating screen is a vibrating or vibrating screen equipped with lattice screens. In the meantime, due to the presence of small particles smaller than usual, they can be consumed.
The conversion of wood chips to fibers
The conversion of wood chips to fibers is the main purpose of this section, in order to dissolve lignin or other woody constituents using disc mill technology under pressure of water vapor. In this section, disk mill technology and equipment for feeding and discharging are designed and designed in such a way as to allow the temperature in the fiber separation area to exceed 150 degrees Celsius in order to save energy needed, in the phrase It can be argued that, by moving a spiral or screw feeder that is horizontally located inside the cone tube, it can be used to compress the compression by applying a high pressure to prevent the leakage of the vapor from Steaming chamber. In this chamber, wood particles are under high pressure saturated steam and temperature Smoke cooked from 150 to 180 centigrade so that their lignin is completely softened. Then, at the end of the steam cycle, the scrapers are transferred to the center of the separating machine (a disk mill) using a screw spiral, in which two disks are fixed in one and the other one, or the rotary disk on the main shaft The motor will be operated and fitted with the fitting of the grooved steel parts on the discs, the final product quality will be affected. Then, the desired quality of fiber produced from the drainage valve is transferred to the outside of the machine and flows into the cyclone section. This part, due to exposure to atmospheric pressure, evaporates water from the fibers and drains down the cyclone They come.
Gluing
In order to increase the quality of the product, the MDF adhesive is added to the fibers through the transfer of fibers from the refferers to the dryers, so that all fibers are exposed to the adhesive and the glue spreads over all fibers, the moisture content is dried up to Less energy is consumed and in the event of an energy saving, drying operations can be expected to be easier as well.
The particles sent from the screens are inside two separate, soft and coarse silos, and with the glue that is being prepared in the gluing room and proceeded to blenders.
Blenders are usually sprayed continuously on wood chips and fibers, a stick that is sent by pumps and blended into blenders.
The bladder cooler is responsible for chillers and cold water
To reduce the water absorption capacity of the fiberboard board, it is necessary to add some paraffin to the fiber, which is usually rolled up into a mildewed moving wood to be refined to be mixed later.Drying the fibers
For pressing the fiber cake, the moisture content should be lower than usual, since high moisture levels will result in the production of water vapor and clogging, and, as a result of this factor, the fiberboard will open in the middle. The fiber will be more humid. The input to the dryers is about 50%, but the moisture content of the fiber after this step and when entering the forging machine is reduced to about 6-12%. The most commonly used dryer type is suspended dryer (in which the suspended fiber is exposed to air Warm up). The starting temperature of the dryers is about 250 to 350 degrees Celsius and the air temperature at the end of the dryer is between 65-85 degrees Celsius.
In the MDF production line, on top of the Forming machine, a continuous cake is stored from the fiber, which uses the wind stream to put the fibers in such a way that fine particles are deposited on the outer surface and coarse particles in the middle of the hard fiber, which this The operation results in the placement of fine fibers on two outer surfaces of the board and the formation of a smooth uniform surface of the product to make it easier to continue the surface payment operation. All functions of the device are controlled by the gamma ray control system and, if any changes in the steering density are transferred to the fiber adjustment unit, the changes are made in the standard of the standard.
Further, due to the uniform distribution of the thickness of the fiber cake, it is necessary to open the press span, which means the need for a precision is quite tangible, and usually continuous belt presses are used to prevent the thickness from exceeding the permissible limit, then for the length of the fibers to be cut into pieces. It is intended that these operations are cut off at the bottom of the site, and the cut-off area will continue through the pneumatic system to the station and simultaneously enter into the press that the STACKING machine performs, usually a short press cycle And temperatures reach around 400 degrees Fahrenheit
Sandblasting operations One or two levels of fiber boards are required to uniformly cover and rupture and change the thickness
In order to increase the resistance of MDF, the fact that this factor approaches the natural wood can be used to cover the surface of the paper with the speed of fast hardening, and this operation will achieve the desired conditions during the process. We have been able to distribute and uniformity of density, We fully adhere to the uniform thickness of the surface. We usually use pencils like polyester, phenol, and melamine to cover them. To achieve ideal conditions, it should be noted that the moisture content of the boards is more than 6-7 % Does not exceed, because the passage of water vapor from this type of paper is hardly done.
Typically rollers in the roller press are pneumatically raised. These rollers are equipped with a digital controller to adjust the thickness of the panel. The compressor system, the main component of which is the membrane pump, can be used to compress compressed air for Propeller to use. Usually other equipment used includes the module for input and output of pneumatic control valves, contactors, PLC.
Caspian door, using the knowledge and experience in the wood industry, can design and implement all types of cabinet cabinets, wood cabinet, cabinet higlass (modern cabinet), membrane cabinet, construction and installation of all kinds of wood doors, MDF door with PVC sheath, PVC HDF door, melamine laminate, construction and installation of all types of wardrobes and wall cabinets and all kinds of complex wooden structures throughout Gilan and Rasht.