While using timber in construction, the engineer is always concerned with the problem of decay and deterioration of timber with age. When timber is shipped long distances over several roads, as is coming to be more and more the case, the saving in freight will make a material difference in the cost of lumber operations, irrespective of any other advantages of seasoning. So, stress is developed due to the difference in shrinkage. So, it is used for door frames, window frames etc. A well seasoned timber contains only 15% moisture. 2. excellent insulator: houses they are built out of bricks also known to have outstanding insulating properties, but timber manages to surpass them; Timber is an elastic material: At the opposite of brick or concrete walls, timber walls don’t need to be very thick. Seasoning of timber or simply Timber seasoning is the process of drying timber or removing moisture or sap, present in a freshly felled timber, under more or less controlled conditions. Advantages : No expensive equipment needed, Environmentallyfriendly. TIMBER SEASONING. It is known as Tangentially Cut timber and is used extensively in the building industry (e.g. 3. This process is known as kiln seasoning. A well-seasoned timber contains moisture about 10-12% of its dry weight. Considering its usefulness timber is cheap. Proper circulation of hot air is maintained by driving the fans. The timber is often dried to 10-12 per cent for indoor use through a process called seasoning. It also ages naturally, which enables it to maintain its look for longer. Seasoning of Timber or Drying of Wood Wood drying (also seasoning lumber or wood seasoning) reduces the moisture content of wood before its use. For ... Chemical Seasoning. Artificial Seasoning of Timber. Read More: Seasoning of Timber and Wood : Its Methods, Objectives. There are multiple advantages to having wood artificially seasoned that relate to … Fibres in Timber: The timber is made of fibres in thousands. 5. 3. It makes timber less liable to be attacked by insects and fungus. Weight of Timber: The weight and the density of timber have to be more.This will reflect a sound timber material. It reduces the possibility of fungi and insect attacks. 33. Causes of Decay of Timber. In other words, chemical seasoning enables the timber to dry first from inside. Plain Sawn timber is the most inexpensive and common type of cut. Kiln Seasoning. The moisture content can be reduced as per requirement. The weight of wood is reduced by about 35% or more when seasoned. The many virtues Over a period, in a natural process moisture content reduces. Reasons for Timber Seasoning. for joists etc.). Timber Seasoning and LaminationAnswer the following questions relating to timber seasoning and lamination.1. This problem may be discussed under two headings: causes of deterioration and preservation of timber. Disadvantages :Takes longer than Kiln seasoning. During seasoning of timber, exterior or surface layer of the timber dries before the interior surface. The moisture content will vary from season to season in standing timber and it will also vary between different parts of the tree such as the sapwood and the heartwood. It is important for you to save time and money. It takes away sap and moisture content and imparts stiffness to timber. 2) Kiln Seasoning. 3. Regular wood seasoning is done by air drying in conditions below 18 percent moisture. Seasoning can be done thoroughly well and in the shortest time under controlled process. It is definitely an advantage as it prevents the risk of cracking of outer cell. … soningofTimber,"byDr.HermannvonSchrenk,pathologistin charge of theMississippiValleyLaboratory, Bureau PlantIndustry, assisted by Reynolds Hill, agent, Bureau of Forestry,and to recom- Freshly felled timber contains moisture 100 to 200% of its dry weight. Seasoning of timber is also achieved by boiling it in water for 3 to 4 hours. Artificial seasoning is the process by which lumber is dried using man-made devices such as a kiln. Before the timber can be used a large part of the moisture must be removed. Due to being low, it starts drying up. For heavy construction works like columns, trusses, piles. The obvious advantage of air drying is its low capital cost in comparison to kiln drying procedures. Coal tar contains unpleasant smell and does not allow paint on it. c) Seasoning by boiling:-This is also quickly method of removing sap from with in a cell. 4. 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). For light construction works like doors, windows, flooring and roofing. This seasoning can be done thoroughly well and in the shortest time under a controlled process. 4. Timber becomes lightweight after seasoning… Coal Tar for Preservation of Timber. Wood drying (also seasoning lumber or wood seasoning) reduces the moisture content of wood before its use. 4. The growth rings are generally 30 0 or less to the face of the board. The timber is to be seasoned is immersed in water and the water is heated to boiling temperature. 3. After a period of 2 to 4 weeks the timber is taken out. Seasoning is the process of drying timber to remove the bound moisture contained in walls of the wood cells to produce seasoned timber. Answer: b Clarification: Natural seasoning is the one that gives stronger timber. Seasoned timber-producing seasoned timber is the process of drying timber to remove the bound moisture contained in walls of the wood cells. In higher grades of timber, especially hardwoods, the seasoning process could enhance the basic characteristic properties of timber; increasing stiffness, bending strength, and compression strength. Electrical Seasoning. Even if your eye is not so well trained, it's not hard to notice the wood's vivid vertical stripes, significant wavy figures and various other majestic grain markings when quartersawn. Kiln seasoning results in weaker, lighter timber. Advantages: 1. Timber shrinks during drying; the main objective of seasoning is to eliminate this shrinkage and the associated drying defects before use. 1) Air Seasoning. Timber is a versatile material. Water seasoning is carried out on the banks of rivers. When the drying is done in a kiln, the product is known as kiln-dried timber or lumber, whereas air drying is the more traditional method. Freight charges can vary considerably, so the ability to decrease timber weight by 35% to 40% helps keep the retail price of your timber lower. Moisture Content of Wood Other advantages are, increase in the strength and eIectrica1 resistance of timber, reduction in weight for trans- 3. 4. With its reduced weight, timber transportation and handling costs are reduced as well. Seasoning of timber is done at lower temperature and higher humidity. Oak timber's advantages in woodwork From a purely aesthetic point of view, oak timber's distinct grain and texture is instantly recognizable to most woodworkers. Timber seasoning is important and beneficial to the timber industry and for use on construction projects for a number of reasons: Reducing the moisture in the timber used in construction projects allows for a higher quality of finish on the constructions. These fibres have to be straight and compact in nature. When the drying is done in a kiln, the product is known as kiln-dried timber or lumber, whereas air drying is the more traditional method.. Seasoning by Boiling. (a) FUNGI. This is a slow but a good process of seasoning. The main objectives of timber seasoning can be listed as follows: 1. However, it is only one time. Steam is injected through the stem pipes in the chamber while the heating pipes are kept at low temperature. CHEMICAL SEASONING: This is a specialist technique. More than half the weight of freshly cut timber consists of moisture or sap. 12.3%.Timber is seasoned to dry out the timber to bring it to a usable and workable condition. In fact timber often gives the means of arriving at the cheapest solution. A 20m wall for example, is strong enough to protect against the winter cold, if given proper treatment. It offers several different advantages. Coal tar is heated and obtained liquid hot tar is applied on timber surface using brush. If the timber has been dried out before being sold, then it has been ‘seasoned’. The fact that timber is a natural material brings several benefits: it’s non-toxic, chemical vapours don’t leak into the property, and it’s safe to touch and handle. Some seasoning can be done by leaving it to ‘air season’, and sometimes the timber is ‘kiln seasoned’ . Clarification: Seasoning increases the stiffness of timber. a) True b) False. Defect in Timber due to Defective Seasoning. After boiling timber is allowed to drying. Objectives of Timber Seasoning. The primary objective of timber seasoning is to reduce the moisture content and also to reduce the unnecessary weight of timber thereby increasing the durability and life span of timber. Timber is used for the following works: 1. 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). Disadvantages of Kiln Seasoning It is recommended to use the kiln seasoning service in large quantity. Prevention of Checking and Splitting As mentioned in the previous point, kiln seasoning could be expensive. This makes the timber liable to less shrinkage. weighting of the stacked timber. Faulty method of seasoning causes serious defects in woods. For other permanent works like for railway sleepers, fencing poles, electric poles and gates. Seasoning is the reduction of moisture content of timber to that of the-surrounding air - Sydney area approx. • Plain Sawn, Tangentially Cut Timber. Kiln seasoning gives stronger timber. THE ADVANTAGES OF TIMBER Timber is worth more than you pay Timber is worth more than you pay Whether an article is cheap or expensive depends on what one can achieve with it and the cost of the alternatives. Advantages: – Timber is an excellent insulator: Brick-built houses are also known to have outstanding insulating properties, but wood manages to surpass them – Timber is an elastic material: As opposed to brick or concrete walls, timber walls don’t have to be very thick. This technique is used in Canada, in some small scale commercial operations. b) A larger quantity can be processed at any one time.2. A 20m timber wall for example, is strong enough to protect the internal space against … Increased Strength and Stability 2. Timber Resistance and durability: The timber has to be resistant towards the action of fungi, insects, alkalies, physical agencies and mechanical agencies. Seasoning increases strength, stability and resistance to decay. Other forms of seasoning are: SOLAR SEASONING - A combination of air and kiln seasoning. MICROWAVE SEASONING - Microwave energy is directed at the timber, driving out the excess moisture. The thicker end of the timber is kept pointing upstream side. Advantages. It is very cheap and has good fire resistance. 3. Give two advantages that air dried timber seasoning has over kiln dried timber seasoning.Answer: a) The end product of air dried timber is less expensive. It increases the resistance to shrinkage, cracking, warping and even decay.
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