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MDF knowledge solution
I. Introduction
MDF is a kind of density board, including long fiber board and short fiber board. A wood-based fiber or other plant fiber as a raw material, broken, fiber separation, drying after the application of urea-formaldehyde resin or other suitable adhesives, and then after hot pressing a man-made board.
Second, use
Because of its excellent performance and an effective way for the comprehensive utilization and rational utilization of wood, medium density fiberboard is one of the most promising products at present.
Third, characteristics
1. The internal structure is uniform, the density is moderate, the dimensional stability is good, the deformation is small, and the physical and mechanical properties are moderate.
2. The surface is smooth and smooth, and the machine processing performance is good. It can be affixed with sliced ​​thin wood, patterns and novel and beautiful decorative papers. Therefore, it is popular among people in home decoration and is often used for making furniture, partitions, etc.
3, can be applied in the modern decorative frameless painting in the middle of the painting and the middle folder, the national registered trademark visual life frameless painting is such an application, so that life is more environmentally friendly.
Fourth, pay attention to matters
1, outside to see if its thickness, density is uniform, there is no damage to the corners, there is no stratification, bulging, carbonization and other phenomena, with or without loose parts.
2. When conditions permit, a small piece of medium density fiberboard can be sawed and soaked in water with a water temperature of 20°C for 24 hours to observe the change in thickness and observe whether there is any snare bag on the board surface. The thickness changes greatly, and there is a snare pack on the board surface, which indicates that the board surface is poor in waterproofness.
3. Select medium-density fiberboard with a low release amount. When selecting and smelling, select medium-density fiberboards with low pungent taste. The higher the odor, the higher the emission of formaldehyde and the greater the pollution.
Five, classification
Density plates, also known as fiberboards, are man-made boards made from wood fibres or other plant fibres, using urea-formaldehyde resin or other suitable adhesives. According to the amount of their different, divided into high-density board, medium density board, low-density board.
MDF is easy to re-process due to its soft and impact resistance. It is a good material for making furniture in foreign countries. However, due to the fact that the national standard for HDF is several times lower than international standards, the quality of MDF in China is very high. Still need to improve.
Medium- and high-density board (MDF-Medium Density·Fiberboard), according to the national standard GB 11718-89: wood fiber or other plant fibers as raw materials, apply aldehyde urea resin or other suitable adhesive to make the density 0.50 Plates in the range of ~0.88 are called medium and high density fiberboard.
The high density board is inferior to the chipboard nail holding power. If loosening occurs after the screw is tightened, it is difficult to fix it because the strength of the density board is not high. Moreover, furniture uses more MDF plates, and in low-grade MDF furniture, the content of formaldehyde is very high, and it is also harmful to people's health. After the air-conditioned plate can eliminate formaldehyde.
Sixth, performance
1, physical and mechanical properties
Because the fiber structure of the plate is uniform and the bonding strength between the fibers is high, its static bending strength, planar tensile strength, and elastic modulus are good. However, because the MDF board is ground into a fiber, completely changing the structure of the wood, so the moisture absorption, water absorption performance, thickness expansion rate is higher, holding nail strength than the chipboard.
2, decorative performance
Due to the flat and smooth surface of the medium density fiberboard, it is easy to glue the veneer to the veneer and thin paper, and it is easy to paint and save paint.
3, processing performance
Medium density fiberboard can be produced from several millimeters to tens of millimeters thick plate, can replace any thickness of wood, square materials, and has a good mechanical processing performance, sawing, drilling, slotting, slitting, sanding and engraving The edge of the plate can be processed in any shape, and the surface after processing is smooth.
Seven, production process
1. Shavings
It is a manufacturing facility for raw materials for the entire board production. It mainly cuts loose wood into chips that meet the production specifications to provide better conditions for fiber separation.
2, hot grinding
The chips cut from the chipping workshop were preheated and mechanically separated to give fibers.
3, fiber drying
The heat-grinding fiber plus sizing makes the moisture content of the fiber reach 40%-50%. If it is difficult to adapt to the following sections without drying the fiber, the main control drying temperature in this process section is about 165°C, which will not cause resin pre-cure. This affects the mechanical properties of the plate's MOR and IB.
4, pavement
It will be dried and stored in the fiber silo for a certain period of time. After being fed to the paving machine by a feed fan, the fiber will be roughly formed by vacuum air flow, and then the forming process of the plate will be realized by a stripping roller and a prepressing machine.
5, hot pressing
It is an important process for the manufacture of MDF. It plays a decisive role in product quality and production. It is the combination of heat and pressure, moisture vaporization in the slab, evaporation, density increase, adhesive, waterproof agent. Redistribution results in a series of changes in each component of the raw material, so that various binding forces are formed between the fibers and the product reaches and meets the quality requirements.
6, sewage treatment
The dry production of MDF basically does not have a large amount of industrial wastewater. It is mainly corked water that is squeezed out by the feed spiral. For this type of wastewater, we mainly use anaerobic treatment, and the process flow chart is as follows:
Wastewater from workshops -> pre-precipitation -> catchment sedimentation tank -> anaerobic tank -> air floatation tank -> SBR tank -> clear water tank -> fiber transitioner -> drainage.
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