It is difficult to boil for large quantities of wood, so hot steam is sometimes passed through wooden logs in enclosed rooms. Also read: What Is Formwork Failure | Causes of Formwork Failure. Moisture content can be reduced as per requirements. Timber is seasoned under controlled temperature and humidity conditions with proper air circulation and ventilation system. The equilibrium moisture content of artificial seasoning (kiln) can be controlled manually or automatically. The purpose of seasoning is to reduce the moisture content in the wood to a level appropriate to the use of the articles made from the wood. • Seasoning of timber should be protected from rain and humidity. United States Patent 1191 Pless ARTIFICIAL SEASONING OF TIMBER [76] Inventor: John Henry Pless, 48 Kinnerton St., London, S.W.l, England [22] Filed: Sept. 8, 1969 [21] Appl. In this method wood is dried usually by the keeping the wood exposed to air, so that the moisture evaporates and wood is seasoned. 1.Boiling. 1. The process of boiling or steaming develops the strength and elasticity of the wood but is economical of the enormous cost. Moisture content of wood can be brought down to about 10 – 20% by natural seasoning. Cl. Seasoning may be completed in 4 to 5 days only. If this sap is not removed the timber is likely to warp, crack and shrink. The different methods of seasoning are: Boiling; Kiln seasoning; Chemical seasoning; Electrical seasoning. Kiln-seasoning thus began to assume an important position, where timber was in question, in commercial centres. Wood drying (also seasoning lumber or wood seasoning) reduces the moisture content of wood before its use. Timber seasoning types. Time required for natural seasoning of timber is around 120 to 180 days. 15. 34/1 [51] Int. Artificial Seasoning of timber are: A. Kiln Seasoning. Therefore, defects in timber such as shrinkage, cracks and wrapping are minimum. (ii) Artificial Seasoning: In this method timber is seasoned in a chamber with regulated heat, controlled humidity and proper air circulation. To make it suitable … Seasoning of timber means removal of moisture content from timber. After artificial seasoning the wood becomes harder, whereas in natural seasoning the wood becomes soft. The timber contains free moisture and bound moisture. The wood with desired moisture content may be obtained by the artificial seasoning. To resist the attack of insects, fungi. Moisture content in wood can be reduced to the desired level due to the artificial seasoning. The popular method of artificial seasoning is kiln seasoning. The procedure of manufacturing artificial stone is as follows: a. So the chances of fungi and insect attacks are less. There are Two Methods of Seasoning of Timber. Natural Drying/Air Drying Air-drying is the drying of timber by exposing it to the air. Vertical spacing achieved by using timber battens (25mm) of the same species. So much so that repeated inquiries for … The moisture content of timber should be kept between 10 to 12 % of its dry weight. It reduces the time for seasoning. Advantages and Disadvantages of Air Seasoning of Timber compared to Kiln Drying (Continued from Timber Kiln Drying Equipment) • Kilns can dry to lower moisture contents than can air seasoning – in fact we must use kilns in countries having cool, moist weather conditions (such as U.K.) for most indoor applications. Seasoning of timber is also obtained by boiling in water for 3 to 4 hours. Manufacturing of Artificial Stone. The process of dying timber or removing moisture or sap, present in a freshly felled tree, is called seasoning of Timber. To minimise the cost of handling, transport by decreasing the weight of wood. Howard, Alexander Liddon, 1863-1946 Type. In comparison to conventional pressurized steam heated kiln with boiler, our seasoning kilns require less maintenance. This method of seasoning timber is cheap and simple. MC Neills Seasoning. With this process the timber is roughly sawn to size and stacked using spacers called stickers, with the timber stacked in the open air. Water Seasoning . Advantages Of Kiln Seasoning. In this method of artificial seasoning, the timber is immersed in water and water is then boiled. Artificial Seasoning To make the drying more uniform and even, by controlled conditions artificial seasoning is adopted. Artificial Seasoning. The wood is allowed to dry after boiling. Natural Seasoning ; Artificial Seasoning; 1. Kiln Seasoning or Conditioning (aka Artificial Seasoning) is the method now most commonly used, especially for Softwood, because it is quicker and more economic. A newly fell tree contains water up to 50% of its dry weight. Artificial stone can be moulded into most intricate forms easily and so it is most economical when it is substituted for the carvings and ornamentations in natural stone. The periods of seasoning and shrinkage are reduced by this method, but it affects the elasticity and strength of wood. Artificial drying or kiln drying. Seasoning of Timber Revised by A. LAMOND and J. HARTLEY "Free" and "Bound" moisture Expressed as a formula: Fibre saturation point As the free moisture leaves the cell cavity, it will eventually become empty, leaving the cell wall still saturated. Natural Seasoning. Seasoning is done for the following reasons: When wood utilised as fuel, to make it burn quickly seasoning is done. The Seasoning of Timber "Seasoning" is the name given to the methods of drying timber. Seasoning can be completed in 4 to 5 days only. It requires about 60 to 90 days for softwood. A manual of the timbers of the world; their characteristics and uses, to which is appended an account by S. Fitzgerald of the artificial seasoning of timber. The timber is thus boiled with water for about three to four hours. To give strength, hardness and to make electrically resistant. The major aspect of his research work was focused on moisture content in timber resulting from poor and improper seasoning where he revealed how various artificial seasoning methods do account for the main causes of defects in timber and how they can be prevented. Why we need Seasoning Of Timber. Natural Seasoning; Artificial Seasoning; Lets discuss both methods one by one. SEASONING OF TIMBER. Seasoning increase the strength of timber; To make concrete durable; To increase dimensional stability ; Seasoning reduces the weight of timber; Seasoning Methods. This is a very quick method. : 855,880 [30] Foreign Application Priority Data 9 Sept. 6, l968 Great Britain 42,609/68 [52] US. Seasoning isn’t always uniform in all the section of timber. To decrease shrinkage, cracks and warpage in wood. A manual of the timbers of the world; their characteristics and uses, to which is appended an account by S. Fitzgerald of the artificial seasoning of timber by Howard, Alexander Liddon, 1863-1946 The seasoning of timber using natural elements like water, the air is known as NATURAL SEASONING The natural seasoning could even be water seasoning or air seasoning. Seasoning is necessary because it reduces the risk of decay or attack by fungi on green or unseasoned timber. Seasoning of timber can be carried out either naturally or artificially. Natural / Air Seasoning Artificial/ Kiln seasoning 3. Natural Seasoning. In Water Seasoning method, timer kept immersed in ponds or … 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.. In natural seasoning, timber … Well -seasoning timber is ready to use. Artificial Seasoning: In this method, the wood is kept in a chamber with regulated heat, Controlled humidity and proper air circulation. Published material. Shrinkage, cracking and warping are minimized in artificial seasoning. It is the process in which logs of timber are boiled in water in temperature at which is placed up to a boiling point and is maintained for several hours after which it is dried naturally. By. Natural or Air seasoning: T his method of seasoning the wood is simple and cheap, but it very slow. A meter is attached to the kiln which shows the reading of the moisture contained in the timber. 2) Kiln Seasoning Advantages: Insects are killed during this process, Require little stacking space, Moisture content of the timber may be brought to any desired level Types of Timber Seasoning: The main types of timber seasoning are as under. Publication info. Natural Seasoning of Timber: Artificial Kiln Seasoning of Wood: Natural Seasoning is the most traditional way of seasoning wood or timber. Seasoning of Timber. Less … In artificial seasoning, the drying is fast and uniform. Seasoning can only be completed in 4 to 5 days. Free moisture is present in timber as water vapor while bound moisture is present in cell walls. The different methods of seasoning are: (a) Boiling (b) Kiln seasoning (c) Chemical seasoning (d) Electrical seasoning. LondonMacmillan1920 Subjects The kiln avoids the heat transmission loss as it discontinues the flow of steam and heated oil. 2. For practical use, it is formed into a mortar or is used as concrete. It is then dried very slowly under a shed. Care must be taken not to dry out timber too quickly otherwise the timber may split and crack or have severe stresses induced into it. It may even decay. Artificial seasoning. There are two methods by which timber can be dried: Natural drying or air drying. It is uneconomical to provide artificial seasoning to timber sections thicker than 100 mm, as such sections dry very slowly, hence such thicker timber sections are usually seasoned by the process of air seasoning. Well seasoned in a short span of time. It also gives good results. This is such an important stage in the drying that it is given a special name, and the term is "fibre saturation point". No. There are two method of Seasoning as classified below. seasoning of Timber: Method of Seasoning:-The following two methods are commonly used for the seasoning of Timber. 2) Artificial seasoning:-Artificial seasoning are the quick process of seasoning and moisture content can be controlled. Natural Seasoning : Timber pieces can either be stacked horizontally or vertically and the seasoning is carved out by natural air. Book Material. There are different methods of artificial seasoning. Newly felled tree contains a considerable quantity of sap. 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