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Monday, October 22, 2012

Method of drying timber

Wood must be dried before use

For wood drying method used a variety of ways. You have to understand the situation on the wood. Despite the relatively small volume of water but also the surface is small and requires a longer evaporation. In addition, you need a longer time during the process of stacking and unloading the drying chamber. The drying process can be done with both traditional and artificial drying

Drying is traditionally done by the sun. For the log to meet the requirements of the drying process to prevent rapid deterioration is to make it so it does not have to be high when there is rain flooded. Sources pest should also be eliminated. The ground floor of the log to be loaded quickly angled to the water flow at the base of the floor.

Stacking can be done vertically and is suitable for wood that is not easy to crack. Stacking horizontal or parallel to produce the amount of wood more. The disadvantage is the drying will be slower because of the surface covered by other wood.
Stacking also do cross so that the touch area to be small and slanted wooden layout and there will be no water deposits on wood so the wood dry faster. Another Stacking is a triangle. Wider area required, drying will be faster than the contact area of ​​the wood.

Drying in the sun has a weakness that is drying speed, capacity and length of drying and highly dependent on the presence of the sun's heat. For faster drying can be done in a conventional manner. How this is done by using steam that is pushed into the room and then circulated by the ventilation fan in it. Steam heat will dry the wood and moist air out through vents in them. Drying this way is quite good because it is done in stages and stable. The downside of this system is in need of considerable power because of the flow of steam into the room should not be stopped.

The system is faster than the conventional way is to use a vacuum kiln. Drying takes place very quickly and this way is superior to other systems and the quality of dried wood. Another advantage is that this system does not cause air pollution as in conventional systems. The downside of this system is the size of the timber should not be limited because of capacity vacuum kiln. So capacity compared to conventional kiln quite small. Operational costs are also larger than the conventional way and also greater investment.

Another way is to recycle the dehumidification kiln to heat the room air and circled back to the sidelines of the wood pile and then get out of the vents. Dehumidification kiln flowed back through the cooling coil so that the water vapor decomposes back.
Water is decomposed and removed through a special exhaust hot air back into the room air. If the air is too hot there is a special fan to circulate the hot air out. The cost involved is also slightly larger than the conventional way.
Operators who have the expertise in the drying process is also very important. With kiln drying can also cause damage or shrinkage in the wood if not careful in execution.

Traditionally, softwoods are inexpensive and easy-to-use woods that are used in the construction of houses for floors, beams, beams, windows and doors. They are usually painted. Hardwoods, on the other hand, are usually more expensive and are considered to be more durable and difficult to work. They are used to make furniture and sometimes they are dyed, then polished or varnished to highlight their natural decorative properties of texture and texture.

In recent years, many traditional British and European hardwoods such as ash, elm and lime have been replaced by varieties from Africa, the Far East and North America. South. The most commonly available hardwoods are so-called "red" hardwoods (mostly mahogany) and yellow ramin, but a wide range is available from lumberjacks.

Due to the high cost of hardwood, it has largely been replaced by home improvement work done with synthetic planks covered with a thin hardwood veneer (eg teak or mahogany) that is widely used in the manufacture of furniture shelves.

There is a good selection of plastic panels that can replace the use of smooth wooden boards: There is also a wide selection of hardwood and soft wood strips that can be used at home. The most common sizes of softwood and some types of hardwood are available in large self-service stores as well as in some hardware stores; Go to a timber dealer for the entire area.

Transformation and seasoning
A tree that has just been felled contains a lot of moisture. To turn it into usable wood, it has to be cut and dried. These processes are called transformation and seasoning. Some soft woods can be treated with preservatives.

The wood is usually sawn: or end-to-end (sometimes referred to as a single cut or cut per cut). This method cuts the record into tables by simply cutting it into the tree. Most growth rings make an angle of less than 45 degrees to the surface. The moisture content of a tree is greater outdoors than in its center. When the sawn wood is completely dried, all the boards, except those cut directly in the middle of the tree, tend to deform. , Planks should be planned flat after drying.

or quarter sawed. The wood has growth rings that make an angle of 45 degrees or more with respect to the surface of the plate. It is often more expensive than sawdust as a whole, but it is much less likely to be deformed.

Dry wood when stacked or dried in the fresh air. Drying makes wood stronger, more resistant to mold and better for painting and varnishing. Once the wood has dried, it can still absorb and lose moisture; It contracts when it loses moisture and expands when moisture gets wet. Outdoors stored wood is reduced in closed rooms, especially in rooms with central heating. The effect on wood depends on how the wood was cut: the sawn wood in its extension tends to warp, while the sawn wood in a room tends to be evenly reduced. When wood moves between environments with very different moisture levels, it is important to balance the wood with its new environment. For smaller sizes, it can take a few days, for larger ones, more than a week.

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