For large quantity of timber boiling is difficult so, sometimes hot steam is passed through timber logs in enclosed room. Architects Academy 26,301 views. There are mainly two methods of seasoning of timber. The common chemicals used for the purpose include urea, carbon dioxide, ammonium carbonate etc. Seasoning is the process of drying timber to remove the bound moisture contained in walls of the wood cells to produce seasoned timber. The Stacks are so constructed to allow free circulation of air around each part as far as possible. You will receive a link and will create a new password via email. Of the methods available for seasoning wood, air drying is the oldest and simplest. It reduces the possibility of fungi and insect attacks. A well-seasoned timber can also be efficiently treated with preservative. Sorry, you do not have permission to ask a question, You must login to ask question. Methods of Drying Wood Air Seasoning The progress of this method of seasoning is relatively low. In this method, the boiling of timber is done followed by the drying of timber. Dried wood is the most commonly used timber in construction and furniture making and the art of seasoning … Generally, when a tree has been freshly felled, it contains a considerable amount of sap. Definition : Seasoning is defined as the removal of moisture that is present in the timber in its green state. Various Methods of Seasoning of Timber, Different Types of Levels Used for Leveling in Surveying, Different Types of Sedimentation Tanks used in Water Treatment, Embodied Carbon in Construction: High Time to Reduce it, Passive House: Reduce Energy Consumption in Your Building, Important Know-How on Progressive Collapse of Building Structures, Types of Foundation for Buildings and their Uses [PDF], Calculate Quantities of Materials for Concrete -Cement, Sand, Aggregates, Methods of Rainwater Harvesting [PDF]: Components, Transport, and Storage, Quantity of Cement and Sand Calculation in Mortar, Standard Size of Rooms in Residential Building and their Locations, Machu Picchu: Construction of the Lost City of Incas. Seasoning of Timber From day to day, most people have some contact with "seasoned" timber. There are two main reasons for drying wood: Woodworking When wood is used as a construction material, whether as a structural support in a … 6. It is also called as rapid seasoning and it is uneconomical. When the drying is done in a kiln, the product is known as kiln-dried timber, whereas air drying is the more traditional method. Seasoning blends may be dry or wet. Thus, seasoning of timber is accomplished. The resistance of timber against electricity is measured at every interval of time. It increases the resistance to shrinkage, cracking, warping and even decay. If this sap is not removed, the timber becomes prone to defects like warping, cracking, shrinkage and decaying. So, artificial seasoning of timber is developed nowadays. timber the term "moisture content" must be under­ stood. The circulation of hot air facilitates the reduction of moisture content. Seasoning of timber is the process by which moisture content in the timber is reduced to required level. It increases the strength and stability of the timber. 3. What is the difference between Airport, Aerodrome and Airfield. Warping is a kind of variation from a true or plain surface and may … It is ensured that air is circulated freely in the logs of the timber. A number of commercial processes for seasoning of timber are available, but the most common one is kiln-drying. Some of such important defects are discussed as under. Further seasoning needs to be done inside, in heated and ventilated buildings. The wood does not shrink noticeably with the grain. From childhood days ­ It is a simple and cost-effective ( cheaper method). Thus, seasoning of timber is necessary to remove the undesirable sap leaving behind uniformly distributed moisture throughout the mass of timber. The circulation of air results in the reduction of moisture content of timber. | Advantages, Disadvantages & Uses, What is Irrigation? This is a very rapid method of seasoning and is completed within a short period of only 5 to 8 hours. This method is efficient for producing well-seasoned timber but it is comparatively costlier. The salt solution used has the tendency to absorb water from the timber. 4:25. Natural seasoning may be water seasoning or air seasoning. This can cause it to shrink but it helps to prevent warping, splitting, it will become lighter and stronger and it becomes easier to machine. In a kiln seasoning, the drying of timber is performed inside an airtight chamber of the oven. If this process is not controlled properly defects can occur that can ruin good timber. In air seasoning, timber in properly cut forms is stacked in a proper manner in the open air for losing moisture by process of evaporation. A well-seasoned timber has 15% moisture content in it. Seasoning process actually turns greenwood into dry wood. Seasoning of Timber. Well -seasoning timber is ready to use. Tunnel Alignment: What is its Importance in Tunnel Construction? of wet wood to the passage of electricity, for example, is actually less than tbat for pure water. Chemical seasoning includes storage of timber in a suitable salt solution for a certain period. Air dried lumber is suitable for exterior use, and green timber is also frequently allowed to partially air dry prior to kiln drying. These defects in timber can be due to natural forces, fungi, insects, and during seasoning and conversion. Dried Wood. In the process of air seasoning timber logs are arranged in layers in a shed. Seasoning can be achieved in a number of ways, but the aim is to remove water at a uniform rate through the piece to prevent damage to the wood during drying (seasoning degrade). During seasoning of timber, exterior or surface layer of the timber dries before the interior surface. One of the methods of developing the strength and durability of timber is the seasoning of timber. Artificial Seasoning Following tree diagram can be used to illustrate all the methods of timber seasoning. Kiln Seasoning. © 2009-2020 The Constructor. What is the percentage of carbon in wrought Iron? Become VIP Member, Do you need to remove the ads? These methods are relatively faster than the conventional natural methods of seasoning. Before it can be used it must be dried. By the movement of air, the moisture content in timber slowly reduces and seasoning occurs. After sufficient immersion, the timber is removed and left for drying. Natural seasoning gives good results but takes more time. The timber becomes more workable upon seasoning. It affects the strength of the timber. They are further described below: The natural method of seasoning is carried out with the aid of natural factors mainly air and water. b. Seasoning by Boiling Seasoning of timber by boiling is a very fast method of artificial seasoning. 3. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. Generally, the chamber is constructed with bricks. There are various types of defects in timber as a construction material. Wood Seasoning 1. | Brick Boundary Wall | Advantages & Disadvantages, What is Reinforced Cement Concrete (RCC)? b. Examples of some of these ethnic seasoning blends (as they're sometimes called) are Cajun, Creole, and Italian. Seasoning of timber types of seasoning - Duration: 4:25. Wood drying (also seasoning lumber or wood seasoning) reduces the moisture content of wood before its use. The main objectives of timber seasoning can be listed as follows: 1. Lost your password? Thus obtained timbers are relatively weaker than air seasoned one. Even though it is a slow process it will produce well-seasoned timber. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Timber is an important construction material used widely for various engineering purposes. Natural seasoning or Air seasoning Natural seasoning as the name suggest is the natural way of removing moisture from timber. Summing up, Timber Seasoning is the first step in the efficient utilization of timber, especially where several commercially important species of wood are hard, heavy and prone to develop defects during drying. This is simply the weight of water contained in a piece of timber compared with the weight of actual woody substance in the same piece. However, it is a relatively expensive method of seasoning. Water Seasoning This is the natural method of seasoning in which the timber is immersed in water to remove the sap of timber. In this method of seasoning, the logs of timber are stacked in order, under a shed. It is a widely used method of artificial seasoning because of its high efficiency. Types of these defects in wood are discussed in detail. Thus, the handling of timber becomes easier. It may be further classified into the following: a. Faulty method of seasoning causes serious defects in woods. And the timber is seasoned. 2. The hot air circulates in between the timber logs and reduces the moisture content. The temperature inside the chamber is raised with the help of heating coils. 5. Artificial method of seasoning of timber is accomplished under controlled conditions. Defects due to conversion and seasoning of timber involve shakes, warping, bowing, twist, diamonding, casehardening and honey combing. d. Electrical Seasoning Electrical seasoning is the type of artificial seasoning in which electricity is used for reducing the moisture content. This method provides better seasoning results with green timber. So, the moisture content is removed and then timber is allowed to drying. If this sap is not removed the timber is likely to warp, crack and shrink. All Rights Reserved. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. The timber is laid out as seen in the diagram below. Detail explanation along with advantages and disadvantages of these methods of seasoning is discussed below. There are three main ways to reduce moisture in timber … Field electrodes are used to convert the high voltage current to the heat. Trees give us the timber, which is converted into the required form and finally used. The following article is from The Great Soviet Encyclopedia (1979). The arrangement is done by maintaining some gap with the ground. A well-seasoned timber also offers better electrical resistance. A sound and durable timber is a must for ensuring the structural stability and performance of the structure being constructed. What are the important points of FIDIC Contract we should keep in mind during tendering? 2. Since resistance changes little above twenty-five percent The logs are arranged in such a way that air is circulated freely between logs. Newly felled tree contains a considerable quantity of sap. In this method of seasoning, the logs of timber are subjected to the high frequency of alternating currents. Air seasoned timbers are more resistive towards fungal and insects attack. Kiln seasoned timbers are less resistive to the attack of insects and fungal. 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